Search tips
Search criteria

Results 1-25 (163)

Clipboard (0)

Select a Filter Below

more »
Year of Publication
more »
1.  Mandarin Fish Caveolin 1 Interaction with Major Capsid Protein of Infectious Spleen and Kidney Necrosis Virus and Its Role in Early Stages of Infection 
Journal of Virology  2013;87(6):3027-3038.
Infectious spleen and kidney necrosis virus (ISKNV) is the type species of the genus Megalocytivirus from the family Iridoviridae. ISKNV is one of the major agents that cause mortality and economic losses to the freshwater fish culture industry in Asian countries, particularly for mandarin fish (Siniperca chuatsi). In the present study, we report that the interaction of mandarin fish caveolin 1 (mCav-1) with the ISKNV major capsid protein (MCP) was detected by using a virus overlay assay and confirmed by pulldown assay and coimmunoprecipitation. This interaction was independent of the classic caveolin 1 scaffolding domain (CSD), which is responsible for interacting with several signaling proteins and receptors. Confocal immunofluorescence microscopy showed that ISKNV MCP colocalized with mCav-1 in the perinuclear region of virus-infected mandarin fish fry (MFF-1) cells, which appeared as soon as 4 h postinfection. Subcellular fractionation analysis showed that ISKNV MCP was associated with caveolae in the early stages of viral infection. RNA interference silencing of mCav-1 did not change virus-cell binding but efficiently inhibited the entry of virions into the cell. Taken together, these results suggested that mCav-1 plays an important role in the early stages of ISKNV infection.
PMCID: PMC3592132  PMID: 23283951
2.  Alcohol consumption in 0.5 million people from 10 diverse regions of China: prevalence, patterns and socio-demographic and health-related correlates 
Millwood, Iona Y | Li, Liming | Smith, Margaret | Guo, Yu | Yang, Ling | Bian, Zheng | Lewington, Sarah | Whitlock, Gary | Sherliker, Paul | Collins, Rory | Chen, Junshi | Peto, Richard | Wang, Hongmei | Xu, Jiujiu | He, Jian | Yu, Min | Liu, Huilin | Chen, Zhengming | Li, Liming | Chen, Zhengming | Chen, Junshi | Collins, Rory | Wu, Fan | Peto, Richard | Chen, Zhengming | Lancaster, Garry | Yang, Xiaoming | Williams, Alex | Smith, Margaret | Yang, Ling | Chang, Yumei | Millwood, Iona | Chen, Yiping | Zhang, Qiuli | Lewington, Sarah | Whitlock, Gary | Guo, Yu | Zhao, Guoqing | Bian, Zheng | Wu, Lixue | Hou, Can | Pang, Zengchang | Wang, Shaojie | Zhang, Yun | Zhang, Kui | Liu, Silu | Zhao, Zhonghou | Liu, Shumei | Pang, Zhigang | Feng, Weijia | Wu, Shuling | Yang, Liqiu | Han, Huili | He, Hui | Pan, Xianhai | Wang, Shanqing | Wang, Hongmei | Hao, Xinhua | Chen, Chunxing | Lin, Shuxiong | Hu, Xiaoshu | Zhou, Minghao | Wu, Ming | Wang, Yeyuan | Hu, Yihe | Ma, Liangcai | Zhou, Renxian | Xu, Guanqun | Dong, Baiqing | Chen, Naying | Huang, Ying | Li, Mingqiang | Meng, Jinhuai | Gan, Zhigao | Xu, Jiujiu | Liu, Yun | Wu, Xianping | Gao, Yali | Zhang, Ningmei | Luo, Guojin | Que, Xiangsan | Chen, Xiaofang | Ge, Pengfei | He, Jian | Ren, Xiaolan | Zhang, Hui | Mao, Enke | Li, Guanzhong | Li, Zhongxiao | He, Jun | Liu, Guohua | Zhu, Baoyu | Zhou, Gang | Feng, Shixian | Gao, Yulian | He, Tianyou | Jiang, Li | Qin, Jianhua | Sun, Huarong | Liu, Liqun | Yu, Min | Chen, Yaping | Hu, Zhixiang | Hu, Jianjin | Qian, Yijian | Wu, Zhiying | Chen, Lingli | Liu, Wen | Li, Guangchun | Liu, Huilin | Long, Xiangquan | Xiong, Youping | Tan, Zhongwen | Xie, Xuqiu | Peng, Yunfang
Background Drinking alcohol has a long tradition in Chinese culture. However, data on the prevalence and patterns of alcohol consumption in China, and its main correlates, are limited.
Methods During 2004–08 the China Kadoorie Biobank recruited 512 891 men and women aged 30–79 years from 10 urban and rural areas of China. Detailed information on alcohol consumption was collected using a standardized questionnaire, and related to socio-demographic, physical and behavioural characteristics in men and women separately.
Results Overall, 76% of men and 36% of women reported drinking some alcohol during the past 12 months, with 33% of men and 2% of women drinking at least weekly; the prevalence of weekly drinking in men varied from 7% to 51% across the 10 study areas. Mean consumption was 286 g/week and was higher in those with less education. Most weekly drinkers habitually drank spirits, although this varied by area, and beer consumption was highest among younger drinkers; 37% of male weekly drinkers (12% of all men) reported weekly heavy drinking episodes, with the prevalence highest in younger men. Drinking alcohol was positively correlated with regular smoking, blood pressure and heart rate. Among male weekly drinkers, each 20 g/day alcohol consumed was associated with 2 mmHg higher systolic blood pressure. Potential indicators of problem drinking were reported by 24% of male weekly drinkers.
Conclusion The prevalence and patterns of drinking in China differ greatly by age, sex and geographical region. Alcohol consumption is associated with a number of unfavourable health behaviours and characteristics.
PMCID: PMC3733702  PMID: 23918852
Alcohol; drinking; cohort study; descriptive analysis; China
3.  Infectious Spleen and Kidney Necrosis Virus (a Fish Iridovirus) Enters Mandarin Fish Fry Cells via Caveola-Dependent Endocytosis 
Journal of Virology  2012;86(5):2621-2631.
Infectious spleen and kidney necrosis virus (ISKNV) is the type species of the genus Megalocytivirus from the family Iridoviridae. Megalocytiviruses have been implicated in more than 50 fish species infections and currently threaten the aquaculture industry, causing great economic losses in China, Japan, and Southeast Asia. However, the cellular entry mechanisms of megalocytiviruses remain largely uncharacterized. In this study, the main internalization mechanism of ISKNV was investigated by using mandarin fish fry (MFF-1) cells. The progression of ISKNV infection is slow, and infection is not inhibited when the cells are treated with ammonium chloride (NH4Cl), chloroquine, sucrose, and chlorpromazine, which are inhibitors of clathrin-dependent endocytosis. The depletion of cellular cholesterol by methyl-β-cyclodextrin results in the significant inhibition of ISKNV infection; however, the infection is resumed with cholesterol replenishment. Inhibitors of caveolin-1-involved signaling events, including phorbol 12-myristate 13-acetate (PMA), genistein, and wortmannin, impair ISKNV entry into MFF-1 cells. Moreover, ISKNV entry is dependent on dynamin and the microtubule cytoskeleton. Cofraction analysis of ISKNV and caveolin-1 showed that ISKNV colocates with caveolin-1 during virus infection. These results indicate that ISKNV entry into MFF-1 cells proceeds via classical caveola-mediated endocytosis and is dependent on the microtubules that serve as tracks along which motile cavicles may move via a caveola-caveosome-endoplasmic reticulum (ER) pathway. As a fish iridovirus, ISKNV entry into MFF-1 cells is different from the clathrin-mediated endocytosis of frog virus 3 entry into mammalian cells (BHK-21) at 28°C, which has been recognized as a model for iridoviruses. Thus, our work may help further the understanding of the initial steps of iridovirus infection.
PMCID: PMC3302275  PMID: 22171272
4.  Novel Three-Component Rieske Non-Heme Iron Oxygenase System Catalyzing the N-Dealkylation of Chloroacetanilide Herbicides in Sphingomonads DC-6 and DC-2 
Applied and Environmental Microbiology  2014;80(16):5078-5085.
Sphingomonads DC-6 and DC-2 degrade the chloroacetanilide herbicides alachlor, acetochlor, and butachlor via N-dealkylation. In this study, we report a three-component Rieske non-heme iron oxygenase (RHO) system catalyzing the N-dealkylation of these herbicides. The oxygenase component gene cndA is located in a transposable element that is highly conserved in the two strains. CndA shares 24 to 42% amino acid sequence identities with the oxygenase components of some RHOs that catalyze N- or O-demethylation. Two putative [2Fe-2S] ferredoxin genes and one glutathione reductase (GR)-type reductase gene were retrieved from the genome of each strain. These genes were not located in the immediate vicinity of cndA. The four ferredoxins share 64 to 72% amino acid sequence identities to the ferredoxin component of dicamba O-demethylase (DMO), and the two reductases share 62 to 65% amino acid sequence identities to the reductase component of DMO. cndA, the four ferredoxin genes, and the two reductases genes were expressed in Escherichia coli, and the recombinant proteins were purified using Ni-affinity chromatography. The individual components or the components in pairs displayed no activity; the enzyme mixture showed N-dealkylase activities toward alachlor, acetochlor, and butachlor only when CndA-His6 was combined with one of the four ferredoxins and one of the two reductases, suggesting that the enzyme consists of three components, a homo-oligomer oxygenase, a [2Fe-2S] ferredoxin, and a GR-type reductase, and CndA has a low specificity for the electron transport component (ETC). The N-dealkylase utilizes NADH, but not NADPH, as the electron donor.
PMCID: PMC4135782  PMID: 24928877
5.  A Novel Angular Dioxygenase Gene Cluster Encoding 3-Phenoxybenzoate 1′,2′-Dioxygenase in Sphingobium wenxiniae JZ-1 
Applied and Environmental Microbiology  2014;80(13):3811-3818.
Sphingobium wenxiniae JZ-1 utilizes a wide range of pyrethroids and their metabolic product, 3-phenoxybenzoate, as sources of carbon and energy. A mutant JZ-1 strain, MJZ-1, defective in the degradation of 3-phenoxybenzoate was obtained by successive streaking on LB agar. Comparison of the draft genomes of strains JZ-1 and MJZ-1 revealed that a 29,366-bp DNA fragment containing a putative angular dioxygenase gene cluster (pbaA1A2B) is missing in strain MJZ-1. PbaA1, PbaA2, and PbaB share 65%, 52%, and 10% identity with the corresponding α and β subunits and the ferredoxin component of dioxin dioxygenase from Sphingomonas wittichii RW1, respectively. Complementation of pbaA1A2B in strain MJZ-1 resulted in the active 3-phenoxybenzoate 1′,2′-dioxygenase, but the enzyme activity in Escherichia coli was achieved only through the coexpression of pbaA1A2B and a glutathione reductase (GR)-type reductase gene, pbaC, indicating that the 3-phenoxybenzoate 1′,2′-dioxygenase belongs to a type IV Rieske non-heme iron aromatic ring-hydroxylating oxygenase system consisting of a hetero-oligomeric oxygenase, a [2Fe-2S]-type ferredoxin, and a GR-type reductase. The pbaC gene is not located in the immediate vicinity of pbaA1A2B. 3-Phenoxybenzoate 1′,2′-dioxygenase catalyzes the hydroxylation in the 1′ and 2′ positions of the benzene moiety of 3-phenoxybenzoate, yielding 3-hydroxybenzoate and catechol. Transcription of pbaA1A2B and pbaC was induced by 3-phenoxybenzoate, but the transcriptional level of pbaC was far less than that of pbaA1A2B, implying the possibility that PbaC may not be the only reductase that can physiologically transfer electrons to PbaA1A2B in strain JZ-1. Some GR-type reductases from other sphingomonad strains could also transfer electrons to PbaA1A2B, suggesting that PbaA1A2B has a low specificity for reductase.
PMCID: PMC4054222  PMID: 24747891
6.  Services for adolescent psychiatric disorders: 12-month data from the National Comorbidity Survey-Adolescent 
This report examined data on 12-month rates of service use for adolescent mental, emotional, and behavioral disorders.
The National Comorbidity Survey Adolescent Supplement (NCS-A) is a national survey of DSM-IV mental, emotional, and behavioral disorders and service use among U.S. adolescents.
In the 12 months up to the interview, 45% of adolescents with psychiatric disorders received some form of professional help. Youth with mood disorders were most likely to receive services (60.1%), and those with anxiety disorders least likely (41.4%). Services were more likely to be provided in a school setting (23.6% of those with disorders) or by specialty mental health providers (22.8%) than by general medical practitioners (10.1%). Juvenile justice (4.5%), complementary and alternative medicine (CAM) (5.3%), and human services (7.9%) also provided mental health care. Although pediatricians treated a higher proportion of youth with mood disorders than of those with behavior disorders, they were more likely to treat youth with behavior disorders because of the larger number of the latter (11.5% of 1,465 vs. 13.9% of 820). Black youth were significantly less likely than white youth to receive specialty mental health or pediatric services for mental disorders.
The 12-month findings from the NCS-A confirm those of earlier, smaller studies, that only a minority of youth with psychiatric disorders received recent treatment of any sort. Much of this treatment was provided in service settings in which few of the providers were likely to have specialist mental health training.
PMCID: PMC4123755  PMID: 24233052
Epidemiology; psychiatric; adolescents; service use; 12-month; NCS-A
7.  Changes in Birth Weight between 2002 and 2012 in Guangzhou, China 
PLoS ONE  2014;9(12):e115703.
Recent surveillance data suggest that mean birth weight has begun to decline in several developed countries. The aim of this study is to examine the changes in birth weight among singleton live births from 2002 to 2012 in Guangzhou, one of the most rapidly developed cities in China.
We used data from the Guangzhou Perinatal Health Care and Delivery Surveillance System for 34108 and 54575 singleton live births with 28–41 weeks of gestation, who were born to local mothers, in 2002 and 2012, respectively. The trends in birth weight, small (SGA) and large (LGA) for gestational age and gestational length were explored in the overall population and gestational age subgroups.
The mean birth weight decreased from 3162 g in 2002 to 3137 g in 2012 (crude mean difference, −25 g; 95% CI, −30 to −19). The adjusted change in mean birth weight appeared to be slight (−6 g from 2002 to 2012) after controlling for maternal age, gestational age, educational level, parity, newborn's gender and delivery mode. The percentages of SGA and LGA in 2012 were 0.6% and 1.5% lower than those in 2002, respectively. The mean gestational age dropped from 39.2 weeks in 2002 to 38.9 weeks in 2012. In the stratified analysis, we observed the changes in birth weight differed among gestational age groups. The mean birth weight decreased among very preterm births (28–31 weeks), while remained relatively stable among other gestational age subcategories.
Among local population in Guangzhou from 2002 to 2012, birth weight appeared to slightly decrease. The percentage of SGA and LGA also simultaneously dropped, indicating that newborns might gain a healthier weight for gestational age.
PMCID: PMC4274089  PMID: 25531295
8.  Analysis of codon usage bias of mitochondrial genome in Bombyx mori and its relation to evolution 
BMC Evolutionary Biology  2014;14(1):262.
Synonymous codon usage bias (SCUB) is an inevitable phenomenon in organismic taxa, generally referring to differences in the occurrence frequency of codons across different species or within the genome of the same species. SCUB happens in various degrees under pressure from nature selection, mutation bias and other factors in different ways. It also attaches great significance to gene expression and species evolution, however, a systematic investigation towards the codon usage in Bombyx mori (B. mori) has not been reported yet. Moreover, it is still indistinct about the reasons contributing to the bias or the relationship between the bias and the evolution of B. mori.
The comparison of the codon usage pattern between the genomic DNA (gDNA) and the mitochondrial DNA (mtDNA) from B. mori suggests that mtDNA has a higher level of codon bias. Furthermore, the correspondence analysis suggests that natural selection, such as gene length, gene function and translational selection, dominates the codon preference of mtDNA, while the composition constraints for mutation bias only plays a minor role. Additionally, the clustering results of the silkworm superfamily suggest a lack of explicitness in the relationship between the codon usage of mitogenome and species evolution.
Among the complicated influence factors leading to codon bias, natural selection is found to play a major role in shaping the high bias in the mtDNA of B. mori from our current data. Although the cluster analysis reveals that codon bias correlates little with the species evolution, furthermore, a detailed analysis of codon usage of mitogenome provides better insight into the evolutionary relationships in Lepidoptera. However, more new methods and data are needed to investigate the relationship between the mtDNA bias and evolution.
PMCID: PMC4276022  PMID: 25515024
Bombyx mori; Synonymous codon usage bias; Genomic DNA; Mitochondrial DNA; Evolution
9.  Histology subtypes and polyp size are associated with synchronous colorectal carcinoma of colorectal serrated polyps: a study of 499 serrated polyps 
Sessile serrated adenomas (SSA) and traditional serrated adenomas (TSA) are considered as precursors of colorectal cancer, and are often diagnostic challenges. Their true prevalence is masked by significant inter-observer variations. To investigate the true prevalence and synchronous colorectal carcinoma (sCRC) of colorectal serrated polyps (CSP) and their associated factors, we first retrospectively identified all colorectal polyps collected at our institution between June 1995 and May 2013. After centrally reclassifying all CSP to reduce inter-observer variations, Chi-square tests and logistic regression analyses were used to analyze the potential factors. Among the included 5501 colorectal polyps, 499 CSP of 428 patients were identified and studied, including 353 hyperplastic polyps (HP, 70.7%), 80 SSA (16.0%), 61 TSA (12.2%) and 5 mixed polyp (1.0%). Diagnostic disagreements were found in 68 CSP (13.63% of CSP). SSA and TSA were more often larger than 5 mm and in proximal colon than HP. SSA were also more likely associated with older age (p=0.005), size ≥5 mm (p<0.001) and ≥3 polyps (p=0.004) than HP in distal colon, but only more likely associated with older age (p=0.006) in proximal colon. Multivariate regression analysis demonstrated that CSP with sCRC, compared with CSP without sCRC, were linked to CSP size ≥1 cm (vs <1 cm, odds ratio [OR] 4.412, 95% confidence interval [CI] 1.684-11.556, P=0.003) and a diagnosis of SSA or TSA (vs HP, OR 6.194, 95% CI 1.870-20.513, P=0.003 and OR 6.754, 95% CI 1.981-23.028, P=0.002, respectively), but not age, gender, polyp number and polyp shape. SSA and TSA are similarly often associated with sCRC (P=0.460). In conclusion, histology subtypes and polyp size may serve as markers for sCRC of CSP. SSA and TSA may warrant careful endoscopic examinations and similar follow-up intervals.
PMCID: PMC4300721  PMID: 25628945
Conventional adenoma; sessile serrated adenoma; traditional serrated adenoma; hyperplastic polyp; colon
10.  Effects of azithromycin on Pseudomonas aeruginosa isolates from catheter-associated urinary tract infection 
Pseudomonas aeruginosa is a common pathogenic bacterium in urinary tract infections (UTIs), particularly catheter-associated UTIs. The aim of this study was to investigate the effect of azithromycin (AZM) on P. aeruginosa isolated from UTIs. Isolates were identified by biochemical assays and the Vitek system. Antimicrobial susceptibility was determined using the disk diffusion assay. Biofilm formation and adhesion were assayed using a crystal violet staining method. The swimming motility was assayed on agar plates. The elastase activity and rhamnolipid production were determined by the elastin-Congo red method and orcinol reaction, respectively. A total of 32 bacterial isolates were collected from 159 urinary catheters and eight of them were P. aeruginosa isolates. The results showed that the P. aeruginosa isolates had stronger biofilm formation capability and the biofilms were thicker than those of P. aeruginosa PAO1. AZM inhibited biofilm formation and adhesion on urinary catheters, and also decreased swimming motility and the production of virulence factors. The results of this study indicated that AZM is potentially a good choice for use in the treatment of UTIs.
PMCID: PMC4280936  PMID: 25574236
Pseudomonas aeruginosa; azithromycin; urinary tract infection; biofilm; swimming; virulence factor
11.  Utilisation of adsorption and desorption for simultaneously improving protein crystallisation success rate and crystal quality 
Scientific Reports  2014;4:7308.
High-quality protein crystals of suitable size are an important prerequisite for applying X-ray crystallography to determine the 3-dimensional structure of proteins. However, it is often difficult to obtain protein crystals of appropriate size and quality because nucleation and growth processes can be unsuccessful. Here, we show that by adsorbing proteins onto porous polystyrene-divinylbenzene microspheres (SDB) floating on the surface of the crystallisation solution, a localised high supersaturation region at the surface of the microspheres and a low supersaturation region below the microspheres can coexist in a single solution. The crystals will easily nucleate in the region of high supersaturation, but when they grow to a certain size, they will sediment to the region of low supersaturation and continue to grow. In this way, the probability of crystallisation and crystal quality can be simultaneously increased in a single solution without changing other crystallisation parameters.
PMCID: PMC4255177  PMID: 25471817
12.  Epidemiological and viral genome characteristics of the first human H7N9 influenza infection in Guangdong Province, China 
Journal of Thoracic Disease  2014;6(12):1785-1793.
The first H7N9 human case in south of China was confirmed in Guangdong Province on August 2013, outside of the typical influenza season. For investigating the H7N9 virus source and transmission in the local community, we analyze the epidemiology and genome features of the virus isolated from the first human infection detected in Guangdong Province.
The data including medical records, exposure history and time line of events for the H7N9 patient and close contacts was collected. Variation and genetic signatures of H7N9 virus in Guangdong was analyzed using ClustalW algorithm and comparison with mutations associated with changes in biological characteristics of the virus.
The female patient had a history of poultry exposure, and she was transferred from a local primary hospital to an intensive care unit (ICU) upon deterioration. No additional cases were reported. Similar to previous infections with avian influenza A (H7N9) virus, the patient presented with both upper and lower respiratory tract symptoms. Respiratory failure progressed quickly, and the patient recovered 4 weeks after the onset of symptoms. Genome analysis of the virus indicated that the predicted antigen city and internal genes of the virus are similar to previously reported H7N9 viruses. The isolated virus is susceptible to neuraminidase (NA) inhibitors but resistant to adamantine. Although this virus contains some unique mutations that were only detected in avian or environment-origin avian influenza A (H7N9) viruses, it is still quite similar to other human H7N9 isolates.
The epidemiological features and genome of the first H7N9 virus in Guangdong Province are similar to other human H7N9 infections. This virus may have existed in the environment and live poultry locally; therefore, it is important to be alert of the risk of H7N9 re-emergence in China, including emergence outside the typical influenza season.
PMCID: PMC4283329  PMID: 25589974
Avian influenza virus; epidemiology; H7N9; viral genome
13.  A Study on the Effect of Resveratrol on Lipid Metabolism in Hyperlipidemic Mice 
The content of resveratrol is relatively high in Polygonum cuspidatum Sieb. et Zucc., and the resveratrol has the effect of blood vessel dilating, microcirculation improving, platelet aggregation inhibiting and anti-cancer. The objective of this paper was to study the effect of resveratrol on lipid metabolism in hyperlipidemia mice.
Materials and Methods
Through the establishment of an experimental mouse model of hyperlipidemia, the effect of resveratrol on change in total cholesterol (TC), triglyceride (TG), high density lipoprotein cholesterol (HDL-c), and low-density lipoprotein cholesterol (LDL-c) levels in mouse serum were determined.
Resveratrol group can apparently reduce TC, TG, LDL-c and AI of hyperlipidemic mice in a dose effect manner.
We concluded that resveratrol can effectively reduce blood lipid levels of hyperlipidemic mice.
PMCID: PMC3957267  PMID: 24653579
Resveratrol; hyperlipidemia; TC; TG; HDL-c; LDL-c
14.  VP08R from Infectious Spleen and Kidney Necrosis Virus Is a Novel Component of the Virus-Mock Basement Membrane 
Journal of Virology  2014;88(10):5491-5501.
Infectious spleen and kidney necrosis virus (ISKNV), the type species of the genus Megalocytivirus, family Iridoviridae, brings great harm to fish farming. In infected tissues, ISKNV infection is characterized by a unique phenomenon, in that the infected cells are attached by lymphatic endothelial cells (LECs), which are speculated to wall off the infected cells from host immune attack. A viral membrane protein, VP23R, binds and recruits the host nidogen-1 protein to construct a basement membrane (BM)-like structure, termed virus-mock basement membrane (VMBM), on the surface of infected cells to provide attaching sites for LECs. VMBMs do not contain collagen IV protein, which is essential for maintenance of BM integrity and functions. In this study, we identified the VP08R protein encoded by ISKNV. VP08R was predicted to be a secreted protein with a signal peptide but without a transmembrane domain. However, immunofluorescence assays demonstrated that VP08R is located on the plasma membrane of infected cells and shows an expression profile similar to that of VP23R. Coimmunoprecipitation showed that VP08R interacts with both VP23R and nidogen-1, indicating that VP08R is a component of VMBM and is present on the cell membrane by binding to VP23R. Through formation of intermolecular disulfide bonds, VP08R molecules self-organized into a multimer, which may play a role in the maintenance of VMBM integrity and stability. Moreover, the VP08R multimer was easily degraded when the ISKNV-infected cells were lysed, which may be a mechanism for VMBM disassembly when necessary to free LECs and release the mature virions.
IMPORTANCE Infectious spleen and kidney necrosis virus (ISKNV; genus Megalocytivirus, family Iridovirus) is most harmful to cultured fishes. In tissues, the ISKNV-infected cells are attached by lymphatic endothelial cells (LECs), which are speculated to segregate the host immune system. A viral membrane protein, VP23R, binds and recruits the host nidogen-1 protein to construct virus-mock basement membranes (VMBMs) on the surface of infected cells to provide attaching sites for LECs. Although VMBMs lack the collagen IV network, which is an essential structural part of true BMs, VMBMs still show an intact structure. An ISKNV-encoded VP08R protein can self-assemble into a multimer and bind both VP23R and nidogen-1 to maintain the integrity and stability of VMBMs. On the basis of these facts, we redrew the putative schematic illustration of the VMBM structure. Our study suggests that the virus adopts a strategy to remodel the cellular matrix and may provide an important reference to elucidate BM functions and the mechanisms of lymphangiogenesis.
PMCID: PMC4019130  PMID: 24599992
15.  Episodic migraine and obesity and the influence of age, race, and sex 
Neurology  2013;81(15):1314-1321.
To evaluate the episodic migraine (EM)-obesity association and the influence of age, race, and sex on this relationship.
We examined the EM-obesity association and the influence of age, race, and sex in 3,862 adult participants of both black and white race interviewed in the National Comorbidity Survey Replication. EM diagnostic criteria were based on the International Classification of Headache Disorders. Body mass index was classified as underweight (<18.5 kg/m2), normal (18.5–24.9 kg/m2), overweight (25–29.9 kg/m2), or obese (≥30 kg/m2). Adjusted odds ratios (ORs) and 95% confidence intervals (CIs) for EM were estimated using logistic regression. Models were stratified by age (<50/≥50 years), race (white/black), and sex (male/female).
A total of 188 participants fulfilled criteria for EM. In all participants, the adjusted odds of EM were 81% greater in individuals who were obese compared with those of normal weight (OR 1.81; 95% CI: 1.27–2.57; p = 0.001), with a significant trend of increasing odds of EM with increasing obesity status from normal weight to overweight to obese (p = 0.001). In addition, stratified analyses demonstrated that the odds of EM were greater in obese as compared with normal-weight individuals who were 1) younger than 50 years of age (OR 1.86; 95% CI: 1.20–2.89; p for trend = 0.008), 2) white (OR 2.06; 95% CI: 1.41–3.01; p for trend ≤0.001), or 3) female (OR 1.95; 95% CI: 1.38–2.76; p for trend ≤0.001).
The odds of EM are increased in those with obesity, with the strongest relationships among those younger than 50 years, white individuals, and women.
PMCID: PMC3806922  PMID: 24027060
16.  Characterization of the shrimp neuroparsin (MeNPLP): RNAi silencing resulted in inhibition of vitellogenesis 
FEBS Open Bio  2014;4:976-986.
•This is the first comprehensive study of a neuroparsin in a decapod.•Expression of shrimp neuroparsin (MeNPLP) is different after serotonin (5-HT) treatment.•MeNPLP is most likely a secretary product.•MeNPLP is involved in an early stage of vitellogenesis.
The full-length Metapenaeus ensis neuroparsin (MeNPLP) cDNA was cloned which encodes a shrimp protein homologous to the insect neuroparsin and vertebrate insulin-like growth factor binding protein (IGFBP). MeNPLP cDNA is 1389 bp in length and the longest open reading frame is 303 bp in length. The first 27 aa are predicted to be the signal peptide and aa 28–101 is the mature peptide with an estimated molecular weight of 7.83 kDa and pI of 5. It shows high amino acid sequence similarity (42–68%) to the neuroparsin of insects and N-terminal end of the IGFBP of vertebrates. The cysteine residues in MeNPLP responsible for disulfide bond formation are conserved as in other neuroparsin-like proteins. The expression level of MeNPLP is the highest in the hepatopancreas, followed by the nerve cord, brain, heart, ovary, and muscle. However, it was not expressed in the testis. Using an insect neuroparsin antibody, MeNPLP could only be detected in the hepatopancreatic tubules, suggesting that MeNPLP may be a secretary product. Although MeNPLP expression was stimulated in the ovary, it was inhibited in the hepatopancreas after treatment with neurotransmitter serotonin (5-HT). In vivo gene silencing of MeNPLP could cause a significant decrease of vitellogenin transcript level in the hepatopancreas and ovary. As a result, a corresponding decrease in vitellogenin protein level was observed in the hemolymph and ovary. In conclusion, this study has provided the first evidence that MeNPLP is involved in the initial stage of ovary maturation in shrimp.
PMCID: PMC4244560  PMID: 25431753
5-HT, serotonin; CHH, crustacean hyperglycemic hormone; EST, expressed sequence tag; GSI, gonadosomatic index; IGFBP, insulin-like growth factor binding protein; ITP, ion transport peptide; MeNPLP, Metapenaeus ensis neuroparsin; NP, neuroparsin; Shrimp; Neuroparsin; IGF-like binding protein; RNA interference; Vitellogenin
17.  Clinical features, outcomes and treatment-related pneumonitis in elderly patients with esophageal carcinoma 
World Journal of Gastroenterology : WJG  2014;20(36):13185-13190.
AIM: To investigate the clinical features and prognoses of elderly patients with esophageal carcinoma and to compare the effects of radiotherapy and rates of treatment-related pneumonitis (TRP) between elderly and non-elderly patients.
METHODS: A total of 236 patients with esophageal carcinoma who received radiotherapy between 2002 and 2012 were enrolled. The patients were divided into two groups: an elderly group (age ≥ 65 years) and a non-elderly group (age < 65 years). The tumor position and stage, lymph node and distant metastases, and incidence and severity of TRP were compared. Multivariate analysis was applied to identify independent prognostic factors.
RESULTS: The median overall survival times after radiotherapy in the elderly and non-elderly groups were 18.5 and 20.5 mo, respectively. Cox regression analysis showed that TRP grade and tumor-node-metastasis (TNM) stage were independent prognostic factors in the elderly group. High-dose radiotherapy (> 60 Gy) was associated with a high incidence of TRP. Tumor TNM staging was significantly different between the two groups in which TRP occurred. Multivariate analysis showed that TNM stage was an independent prognostic factor. Esophageal carcinoma in elderly patients was relatively less malignant compared with that in non-elderly patients.
CONCLUSION: An appropriate dose should be used to decrease the incidence of TRP in radiotherapy, and intensity modulated radiation therapy should be selected if possible.
PMCID: PMC4177500  PMID: 25278715
Esophageal carcinoma; Radiation therapy; Elderly patients; Treatment-related pneumonitis; Survival rate
18.  Risk Factors for Idiopathic Optic Neuritis Recurrence 
PLoS ONE  2014;9(9):e108580.
Approximately 30–50% of idiopathic optic neuritis (ION) patients experience one or multiple episodes of recurrence. The aim of this study was to search for risk factors for ION recurrence.
Clinical data on hospitalized patients diagnosed with ION between January 2003 and January 2011 at the First Affiliated Hospital of Guangxi Medical University were retrospectively collected. Univariate and multivariate analyses were performed on factors that might cause ION recurrence. In total, 115 ION cases (32 recurrent and 83 non-recurrent cases) with complete data were analyzed. The length of the follow-up period ranged from 12 to 108 months (median: 42 months).
The univariate analysis showed that the recurrence rate for unilateral ION was higher than that for bilateral ION (40% vs. 12%, p = 0.001). Underlying diseases had a significant impact on recurrence (p<0.001): the recurrence rates due to neuromyelitis optica (NMO), multiple sclerosis (MS), demyelinating lesions alone of the central nervous system, and unknown causes were 89%, 70%, 41%, and 8.7%, respectively. The multivariate analysis showed that the factors causing relatively high recurrence rates included NMO (odds ratio [OR], 73.5; 95% confidence interval [CI], 7.3 to 740.9), MS (OR, 33.9; 95% CI, 5.2 to 222.2), and demyelinating lesions alone (OR, 8.9; 95% CI, 2.3 to 34.4), unilateral involvement (OR, 5.7; 95% CI, 1.5 to 21.3), relatively low initial glucocorticoid dosage (equivalent to ≤100 mg prednisone/day) (OR, 4.3; 95% CI, 1.0 to 17.9).
Underlying diseases, laterality (unilateral or bilateral), and initial glucocorticoid dosage are important risk factors of ION recurrence. Clinical physicians are advised to treat ION patients with a sufficient dose of glucocorticoid in the initial treatment stage to reduce the recurrence risk.
PMCID: PMC4177903  PMID: 25255372
19.  Biological characteristics of CD133+ cancer stem cells derived from human laryngeal carcinoma cell line 
Objective: To investigate the in vitro invasive capability, clone-forming ability, resistance to anti-tumor treatments of CD133+ human laryngeal carcinoma stem cells, and characterize the related signaling pathways in these cells. Methods: Human laryngeal carcinoma Hep-2 cells were subjected to flow cytometry sorting to obtain CD133+ stem cells. Transwell chamber assay and clone-formation forming test were performed to evaluate the invasive capability and the clone-forming ability of CD133+ laryngeal carcinoma tumor stem cells, respectively. MTT assay was used to assess the resistance of CD133+ Hep-2 cells to radiotherapy and chemotherapy, respectively. Western blot and real-time PCR were applied to characterize the signaling pathways in these stem cells. Results: Our results from the transwell chamber assay indicated that the migrating capability of CD133+ Hep-2 cells was significantly higher than CD133- cells, and the invasive capability of CD133+ Hep-2 cells was also significantly elevated. Moreover, clone-formation forming test showed higher clone-forming ability for CD133+ Hep-2 cells, compared with CD133- cells. Furthermore, CD133+ Hep-2 cells displayed significant resistance to radiotherapy and chemotherapy. The Bcl-2/Bax ratio was increased, and Hedgehog, Wnt, and Bmi-l signaling pathways were all activated, in CD133+ laryngeal carcinoma stem cells, which might be involved in the self-renewal process of these stem cells. Conclusion: The invasive capability, clone-forming ability, and resistance to anti-tumor treatments are enhanced, and anti-apoptotic and proliferation-related signaling pathways are activated in CD133+ laryngeal carcinoma tumor stem cells. These findings might provide new insights into the prevention and/or treatment of laryngeal carcinoma, especially concerning target-oriented therapies.
PMCID: PMC4211747  PMID: 25356097
CD133; laryngeal carcinoma; tumor stem cells; chemotherapy; radiotherapy
20.  Structural disorder and transformation in crystal growth: direct observation of ring-opening isomerization in a metal–organic solid solution 
IUCrJ  2014;1(Pt 5):318-327.
The co-crystallization of cyclic and polymeric isomers in the same crystal in varying ratios with the skeleton frameworks packed in a geometrically compatible and energetically similar fashion gives a chance to rationalize ring-opening isomerization in a crystal growth process.
A rare example is reported in which discrete Ag2 L 2 ring and (AgL)∞ chain motifs [L = N,N′-bis(3-imidazol-1-yl-propyl)-pyromellitic diimide] co-crystallize in the same crystal lattice with varying ratios and degrees of disorder. Crystal structures obtained from representative crystals reveal compatible packing arrangements of the cyclic and polymeric isomers within the crystal lattice, which enables them to co-exist within a crystalline solid solution. A feasible pathway for transformation between the isomers is suggested via facile rotation of the coordinating imidazolyl groups. This chemical system could provide a chance for direct observation of ring-opening isomerization at the crystal surface. Mass spectrometry and 1H NMR titration show a dynamic equilibrium between cyclic and oligomeric species in solution, and a potential crystallization process is suggested involving alignment of precursors directed by aromatic stacking interactions between pyromellitic diimide units, followed by ring-opening isomerization at the interface between the solid and the solution. Both cyclic and oligomeric species can act as precursors, with interconversion between them being facile due to a low energy barrier for rotation of the imidazole rings. Thermogravimetric analysis and variable-temperature powder X-ray diffraction indicate a transition to a different crystalline phase around 120°C, which is associated with loss of solvent from the crystal lattice.
PMCID: PMC4174874  PMID: 25295173
crystallization; structural transformation; ring-opening isomerism; solid solution; disorder
21.  Limited detection of IgH gene rearrangements in plasma of patients with primary central nervous system lymphoma 
Journal of neuro-oncology  2013;114(3):275-279.
Chemotherapy-based treatment of patients with primary central nervous system lymphoma can lead to durable remissions and potentially cure in a fraction of patients. Accurate assessment of residual disease is necessary to determine the duration and success of treatment that cannot be achieved by contrast-enhanced imaging due to limited sensitivity and specificity. A tumor-derived blood-based biomarker, if detectable and quantifiable, could serve as a more specific and reliable marker for these patients. The goal of this study was to assess whether lymphoma-specific IgH rearrangements can be detected in plasma of patients with PCNSL. PCNSL tissue was analyzed by capturing and sequencing the IgH genomic regions (IgCap) using next generation sequencing with the Illumina platform. Plasma of patients with detected IgH rearrangement was then analyzed for presence of the respective rearrangement using polymerase chain reaction. Tumor tissue and matched plasma of five treatment-naïve patients with biopsy-proven PCNSL (mean age of 65.6 years; range 62–68 years) were analyzed. All patients had measurable contrast-enhancing disease on MRI at time of plasma collection. IgH rearrangements were identified in 4 of 5 analyzed PCNSL tissue samples. The respective rearrangement could be detected in the plasma of 1 patient (25 %) but not in the others. IgH rearrangements can be detected in tumor tissue of patients with PCNSL using IgCap, however, they are absent or only present in minimal quantities in plasma, even in treatment-natïve patients with bulky disease. Alternative strategies to develop circulating biomarkers for PCNSL patients need to be explored.
PMCID: PMC4133769  PMID: 23828278
Primary central nervous system lymphoma; Biomarkers; Gene rearrangements; Circulating tumor DNA
22.  Long-term outcomes following adjuvant endocrine therapy in breast cancer patients with a positive-to-negative change of hormone receptor status following neoadjuvant chemotherapy 
Molecular and Clinical Oncology  2014;2(6):997-1002.
The aim of the present study was to investigate whether breast cancer patients with changes from positive to negative in the hormone receptor following neoadjuvant chemotherapy (NAC) could benefit from adjuvant endocrine therapy (ET). Between December 2000 and November 2010, 97 eligible patients with a positive-to-negative switch of the hormone receptor status following NAC were identified. All the patients were categorized into two groups on the basis of the administration of ET: 57 ET-administered and 40 ET-naïve patients. Survival analyses were performed to examine the prognostic value of ET administration, as well as other clinical and pathological variables. The administration of ET was associated with a significantly improved disease-free survival (DFS) (P=0.018) in patients with a positive-to-negative switch of the hormone receptor status. The 5-year DFS rates were 77.0 and 55.5% in ET-administered and ET-naïve patients, respectively. The 5-year overall survival (OS) rate for ET-administered was also higher than that of the ET-naïve patients (81.3 vs. 72.7%, P=0.053), but the difference between the two groups did not reach a statistical significance. The present study revealed that patients with the hormone receptor that was altered from positive to negative following NAC benefit from ET, and the hormone receptor status should be evaluated not only in specimens obtained during post-NAC surgery, but also in specimens biopsied prior to NAC.
PMCID: PMC4179815  PMID: 25279188
breast cancer; endocrine therapy; neoadjuvant chemotherapy; hormone receptor
23.  A Nation-Wide Multicenter 10-Year (1999-2008) Retrospective Clinical Study of Endocrine Therapy for Chinese Females with Breast Cancer 
PLoS ONE  2014;9(7):e100159.
Endocrine therapy (ET) is one of the main systemic treatments for patients with breast cancer. To our knowledge, few studies have addressed the performance of ET or relevant influencing factors in cancer treatment in China. By retrospectively analyzing the clinicopathological data on breast cancer collected from representative hospitals of 7 traditional areas in China in one random month from each year between year 1999 and 2008, we found that: 1) The rate of the use of hormone receptor (HR) testing was 83.8% (3529/4211), with the estrogen receptor-positive (ER+) rate and/or the progesterone receptor-positive (PR+) rate being 67.9% (2395/3529), and the ER-PR rate being 32.1% (1134/3529). 2) Of the 1599 patients who had received ET, 999 patients (58.3%) were premenopausal while 600 (41.7%) were postmenopausal; 1598 patients received adjuvant hormonal therapy (AHT), whereas only 1 patient received palliative therapy. The medications mainly administered to patients were anti-estrogen agents (80.3% [1283/1598]), followed by AIs (15.5% [248/1598]). Of the 1598 patients receiving AHT, 1416 patients (88.6%) were positive for ER and/or PR, while 75 (4.7%) were negative for both and 108 patients (6.7%) had unknown HR status. The ratio of the use of endocrine therapy for breast cancer patients with ER+ and/or PR+ status was 60.0% (1416/2395). 3) Results from the logistic regression analysis revealed that geography, occupations, and history of chemotherapy and surgery were dependent factors affecting the application of ET in breast cancer treatment in China (P<0.001). In conclusion, the use of ET on Chinese women with breast cancer is increasingly and gradually accounted into the standardized process. Economic status, occupations, and history of chemotherapy and surgery were key factors affecting the application of ET. People residing in developed areas, engaging in mental labour, having history of chemotherapy and surgery are susceptible to accept ET.
PMCID: PMC4103779  PMID: 25036532
24.  Application of intraoperative frozen section examination in the management of female breast cancer in China: a nationwide, multicenter 10-year epidemiological study 
Intraoperative frozen section examination (IFSE) during breast cancer surgery can partly reflect the status of surgical treatment since the surgical method used directly determines the purpose of IFSE use in disease management. This study aims to investigate the application of, changing trends in, and factors influencing IFSE in the management of female breast cancer in China.
We collected the sociodemographic and clinical data of 4,211 breast cancer patients between 1999 and 2008 and statistically analyzed these data using χ2 or Fisher’s exact tests.
A total of 2,283 (54.22%) patients with breast cancer underwent IFSE. During the 10-year study period, IFSE use was associated with an increase in the number of sentinel lymph node biopsies (SLNB) and breast-conserving surgeries (BS) performed, with significant regional differences noted in this trend (P <0.05). Patients’ education, occupation, age, tumor size estimated by preoperative palpation, and the use of imaging examinations affected the purpose of IFSE use (P <0.05).
Our results show that the purpose of IFSE in the surgical treatment of breast cancer in China is gradually approaching that in developed countries. We believe that policymakers must address the differences in breast cancer treatment based on the socioeconomic status of patients. Lastly, the use of IFSE for determining tumor characteristics should be avoided as far as possible, and patient education and breast cancer screening programs tailored to the Chinese population should be established. Our findings may guide the formulation of breast cancer control strategies in China and other low-income countries.
PMCID: PMC4105393  PMID: 25034137
Application mode; Female breast cancer; Intraoperative frozen section examination; Sociodemographic factor
25.  The Novel Bacterial N-Demethylase PdmAB Is Responsible for the Initial Step of N,N-Dimethyl-Substituted Phenylurea Herbicide Degradation 
Applied and Environmental Microbiology  2013;79(24):7846-7856.
The environmental fate of phenylurea herbicides has received considerable attention in recent decades. The microbial metabolism of N,N-dimethyl-substituted phenylurea herbicides can generally be initiated by mono-N-demethylation. In this study, the molecular basis for this process was revealed. The pdmAB genes in Sphingobium sp. strain YBL2 were shown to be responsible for the initial mono-N-demethylation of commonly used N,N-dimethyl-substituted phenylurea herbicides. PdmAB is the oxygenase component of a bacterial Rieske non-heme iron oxygenase (RO) system. The genes pdmAB, encoding the α subunit PdmA and the β subunit PdmB, are organized in a transposable element flanked by two direct repeats of an insertion element resembling ISRh1. Furthermore, this transposable element is highly conserved among phenylurea herbicide-degrading sphingomonads originating from different areas of the world. However, there was no evidence of a gene for an electron carrier (a ferredoxin or a reductase) located in the immediate vicinity of pdmAB. Without its cognate electron transport components, expression of PdmAB in Escherichia coli, Pseudomonas putida, and other sphingomonads resulted in a functional enzyme. Moreover, coexpression of a putative [3Fe-4S]-type ferredoxin from Sphingomonas sp. strain RW1 greatly enhanced the catalytic activity of PdmAB in E. coli. These data suggested that PdmAB has a low specificity for electron transport components and that its optimal ferredoxin may be the [3Fe-4S] type. PdmA exhibited low homology to the α subunits of previously characterized ROs (less than 37% identity) and did not cluster with the RO group involved in O- or N-demethylation reactions, indicating that PdmAB is a distinct bacterial RO N-demethylase.
PMCID: PMC3837831  PMID: 24123738

Results 1-25 (163)