Search tips
Search criteria

Results 1-25 (191)

Clipboard (0)

Select a Filter Below

more »
Year of Publication
more »
1.  Effects of GABA on pancreatic exocrine secretion of rats. 
Journal of Korean Medical Science  2000;15(Suppl):S24-S26.
Since GABA and its related enzymes had been determined in beta-cells of pancreas islets, effects of GABA on pancreatic exocrine secretion were investigated in the isolated perfused rat pancreas. GABA, given intra-arterially at concentrations of 3, 10, 30 and 100 microM, did not exert any influence on spontaneous or secretin (12 pM)-induced pancreatic exocrine secretion. However, GABA further elevated cholecystokinin (10 pM)-, gastrin-releasing peptide (100 pM)- or electrical field stimulation-induced pancreatic secretions of fluid and amylase, dose-dependently. The GABA-enhanced CCK-induced pancreatic secretions were completely blocked by bicuculline (10 microM), a GABAA receptor antagonist but not affected by saclofen (10 microM), a GABA(B) receptor antagonist. The enhancing effects of GABA (30 microM) on CCK-induced pancreatic secretions were not changed by tetrodotoxin (1 microM) but partially reduced by cyclo-(7-aminoheptanonyl-Phe-D-Trp-Lys-Thr[BZL]) (10 microM), a somatostatin antagonist. In conclusion, GABA enhances pancreatic exocrine secretion induced by secretagogues, which stimulate enzyme secretion predominantly, via GABA(A) receptors in the rat pancreas. The enhancing effect of GABA is partially mediated by inhibition of islet somatostatin release. GABA does not modify the activity of intrapancreatic neurons.
PMCID: PMC3202176  PMID: 10981502
2.  Papillary ependymoma: its differential diagnosis from choroid plexus papilloma. 
Journal of Korean Medical Science  1996;11(5):415-421.
Papillary ependymoma is a rare variant of ependymoma and often gives rise to confusion with choroid plexus papilloma because of topographic, light microscopic and ultrastructural similarities. Here, we report two cases of papillary ependymomas regarding their unique clinicopathologic features and differential points from choroid plexus papilloma. Brain MRI revealed a large mass in the left lateral ventricle in one case and a 3cm sized mass in the pineal area and the 3rd ventricle in the other. Microscopically, the tumor was characterized by papillary and tubular structures. Immunohistochemically, the tumor cells in both cases expressed cytokeratins(CK22 and CAM 5.2) but did not express glial fibrillary acidic protein(GFAP), vimentin, epithelial membrane antigen, and S100 protein. This is a very unusual immunohistochemical feature for papillary ependymoma. Ultrastructurally, the tumor showed a mosaic pattern of tumor cells with frequent intercellular microrosettes having a few stubby microvilli, a few cilia and zonulae adherentes. The cytoplasmic processes were markedly reduced compared to conventional ependymoma. The cytoplasm did not contain intermediate filaments. Interestingly, the mitochondria showed abnormal features with a pleomorphic shape and abnormal cristae in both cases. These ultrastructural features enabled differentiation between papillary ependymoma and choroid plexus papilloma in addition to the light microscopic findings.
PMCID: PMC3054185  PMID: 8934397
3.  Inclusion body myositis--a case report. 
Journal of Korean Medical Science  1996;11(4):358-363.
Inclusion body myositis is a rare myopathy that clinically resembles a chronic polymyositis and histopathologically is characterized by the presence of rimmed vacuoles containing ultrastructural cytoplasmic degradation products with filamentous intranuclear and cytoplasmic inclusions. Since clinical features are not uniform, histopathologic and ultrastructural studies are necessary to confirm the diagnosis. We report a typical case of inclusion body myositis with histopathologic and ultrastructural study. The patient was a 31 year old male who presented with progressive weakness of both forearms, hands and lower extremities for 10 years.
PMCID: PMC3054092  PMID: 8878808
4.  Spinal meningeal melanocytoma. 
A case of spinal meningeal melanocytoma is reported along with clinicopathologic, immunohistochemical and ultrastructural studies. This patient presented clinically with paraparesis, tingling sensation and numbness of both lower extremities of 4 months duration. No mucocutaneous pigmented nevi were found. On operation, scattered coal-black pigmented lesions were found in the meninges between T3 and T4-5 interspace level. Nearly total removal was carried out. The tumor was composed of spindle and epithelioid cells with heavy brown-black pigmentation. There was no pleomorphism, mitosis, hemorrhage, necrosis or invasion to the underlying cord tissue. In Korea, this case appears to be the first example of this disease. Neurologic deficit improved after surgical excision.
PMCID: PMC3053837  PMID: 1299241
5.  Evaluation of anatomical landmark position differences between respiration-gated MRI and four-dimensional CT for radiation therapy in patients with hepatocellular carcinoma 
The British Journal of Radiology  2013;86(1021):20120221.
To measure the accuracy of position differences in anatomical landmarks in gated MRI and four-dimensional CT (4D-CT) fusion planning for radiation therapy in patients with hepatocellular carcinoma (HCC).
From April to December 2009, gated MR and planning 4D-CT images were obtained from 53 inoperable HCC patients accrued to this study. Gated MRI and planning 4D-CT were conducted on the same day. Manual image fusions were performed by matching the vertebral bodies. Liver volumes and three specific anatomical landmarks (portal vein conjunction, superior mesenteric artery bifurcation, and other noticeable points) were contoured from each modality. The points chosen nearest the centre of the four landmark points were compared to measure the accuracy of fusion.
The average distance differences (±standard deviation) of four validation points were 5.1 mm (±4.6 mm), 5.6 mm (±6.2 mm), 5.4 mm (±4.5 mm) and 5.1 mm (±4.8 mm). Patients who had ascites or pulmonary disease showed larger discrepancies. MRI–CT fusion discrepancy was significantly correlated with positive radiation response (p<0.05).
Approximately 5-mm anatomical landmark positional differences in all directions were found between gated MRI and 4D-CT fusion planning for HCC patients; the gap was larger in patients with ascites or pulmonary disease.
Advances in knowledge
There were discrepancies of approximately 5 mm in gated MRI–CT fusion planning for HCC patients.
PMCID: PMC3615390  PMID: 23239694
6.  Marker-free registration for the accurate integration of CT images and the subject's anatomy during navigation surgery of the maxillary sinus 
Dentomaxillofacial Radiology  2012;41(8):679-685.
This study compared three marker-free registration methods that are applicable to a navigation system that can be used for maxillary sinus surgery, and evaluated the associated errors, with the aim of determining which registration method is the most applicable for operations that require accurate navigation.
The CT digital imaging and communications in medicine (DICOM) data of ten maxillary models in DICOM files were converted into stereolithography file format. All of the ten maxillofacial models were scanned three dimensionally using a light-based three-dimensional scanner. The methods applied for registration of the maxillofacial models utilized the tooth cusp, bony landmarks and maxillary sinus anterior wall area. The errors during registration were compared between the groups.
There were differences between the three registration methods in the zygoma, sinus posterior wall, molar alveolar, premolar alveolar, lateral nasal aperture and the infraorbital areas. The error was smallest using the overlay method for the anterior wall of the maxillary sinus, and the difference was statistically significant.
The navigation error can be minimized by conducting registration using the anterior wall of the maxillary sinus during image-guided surgery of the maxillary sinus.
PMCID: PMC3528203  PMID: 22499127
registration; image-guided surgery; navigation; maxillary sinus
7.  The Hsp90 inhibitor 17-(allylamino)-17-demethoxygeldanamycin increases cisplatin antitumor activity by inducing p53-mediated apoptosis in head and neck cancer 
Cell Death & Disease  2013;4(12):e956-.
The tumor suppressor p53 is often inactivated in head and neck cancer (HNC) through TP53 mutations or overexpression of mouse double minute 2 or mouse double minute X. Restoration of p53 function by counteracting these p53 repressors is a promising strategy for cancer treatment. The present study assessed the ability of a heat shock protein 90 (Hsp90) inhibitor, 17-(Allylamino)-17-demethoxygeldanamycin (17AAG), to induce apoptosis in HNC by restoring p53 function. The effect of 17AAG, alone or in combination with Nutlin-3a or cisplatin, was assessed in HNC cells using growth and apoptosis, immunoblotting, quantitative reverse transcription-polymerase chain reaction, and preclinical tumor xenograft models. 17AAG activated and stabilized p53 in HNC cells bearing wild-type TP53 by disrupting the p53–MDMX interaction. 17AAG upregulated p21 and proapoptotic gene expression, and promoted apoptosis in a concentration-dependent manner. Growth inhibition by 17AAG was highest in tumor cells with MDMX overexpression. The apoptotic response was blocked by inhibition of p53 expression, demonstrating that the effect of 17AAG depended on p53 and MDMX. 17AAG synergized in vitro with Nutlin-3a and in vitro and in vivo with cisplatin to induce p53-mediated apoptosis. 17AAG effectively induced p53-mediated apoptosis in HNC cells through MDMX inhibition and increased the antitumor activity of cisplatin synergistically, suggesting a promising strategy for treating HNC.
PMCID: PMC3877559  PMID: 24336076
17AAG; p53; MDMX; head and neck cancer; apoptosis
8.  Mycobacterial HBHA induces endoplasmic reticulum stress-mediated apoptosis through the generation of reactive oxygen species and cytosolic Ca2+ in murine macrophage RAW 264.7 cells 
Cell Death & Disease  2013;4(12):e957-.
Mycobacterial heparin-binding haemagglutinin antigen (HBHA) is a virulence factor that induces apoptosis of macrophages. Endoplasmic reticulum (ER) stress-mediated apoptosis is an important regulatory response that can be utilised to study the pathogenesis of tuberculosis. In the present study, HBHA stimulation induced ER stress sensor molecules in a caspase-dependent manner. Pre-treatment of RAW 264.7 cells with an IκB kinase 2 inhibitor reduced not only C/EBP homology protein expression but also IL-6 and monocyte chemotactic protein-1 (MCP-1) production. BAPTA-AM reduced both ER stress responses and caspase activation and strongly suppressed HBHA-induced IL-6 and MCP-1 production in RAW 264.7 cells. Enhanced reactive oxygen species (ROS) production and elevated cytosolic [Ca2+]i levels were essential for HBHA-induced ER stress responses. Collectively, our data suggest that HBHA induces cytosolic [Ca2+]i, which influences the generation of ROS associated with the production of proinflammatory cytokines. These concerted and complex cellular responses induce ER stress-associated apoptosis during HBHA stimulation in macrophages. These results indicate that the ER stress pathway has an important role in the HBHA-induced apoptosis during mycobacterial infection.
PMCID: PMC3877560  PMID: 24336077
ER stress; macrophage; mycobacteria
9.  Medial meniscal root tears and meniscal extrusion transverse length ratios on MRI 
The British Journal of Radiology  2012;85(1019):e1032-e1037.
To evaluate the clinical utility of the meniscal extrusion transverse ratio of the medial meniscus in the diagnosis of meniscal root tear compared with the gold standard of arthroscopic diagnosis.
This retrospective study sample included 32 males and 35 females who underwent MRI at our institution. There were 24 meniscal root tear cases. The control groups were 18 cases of medial meniscal tears without root tears and 25 cases of negative meniscal findings on arthroscopy. Meniscal extrusion (L) and maximal transverse lengths (T) of the medial meniscus were measured, and L/T ratios were calculated. These results were correlated with arthroscopic findings and analysed statistically. With arthroscopic findings used as the standard of reference, the sensitivity and specificity of 10%, 11% and 12% extrusion thresholds, and 3 mm of medial meniscal extrusion (MME) as diagnostic thresholds, were calculated.
The mean length of the meniscal extrusions of meniscal root tears was twice as long as the control group. The mean L/T ratio of the meniscal root tears was approximately 13%, while those of the control groups were 5%. The differences in the L and L/T between the meniscal root tears and normal and meniscal root tears and other meniscal tears were statistically significant (p<0.001), but those between normal and other meniscal tears were not. The best diagnostic discrimination was achieved using an extrusion ratio threshold of 10% (79% sensitivity, 86% specificity). The 3 mm of MME threshold demonstrated high specificity (98%), but not high sensitivity (54%).
The mean L/T ratio of the meniscal root tears was approximately 13% and was statistically significant. The best diagnostic discrimination was achieved using an extrusion ratio threshold of 10%.
Advances in knowledge
The use of the L/T ratio in combination with MME can be a useful method for evaluating medial meniscal root tears.
PMCID: PMC3500800  PMID: 23091292
10.  Non-Typeable Streptococcus Pneumoniae Carriage Isolates Genetically Similar to Invasive and Carriage Isolates Expressing Capsular Type 14 in Brazilian Infants 
The Journal of infection  2010;61(4):314-322.
We have recently found a high prevalence of non-typeable pneumococcal isolates (NTPn) circulating in day-care centers in Central Brazil, besides serotype 14 isolates. We therefore examined the genetic relationship among NTPn and serotype 14 from carriage and invasive pneumococcal isolates obtained from children attending emergency rooms enrolled in a population-based surveillance.
The isolates were characterized by Quellung reaction serotyping, PCR for the presence of pneumolysin and the loci for a capsule gene (cpsA) and the type 14 gene (cps14H) in all NTPn, and by multilocus sequence typing and pulsed field gel electrophoresis.
87.2% of the isolates were clustered into nine clusters. The major cluster included 41 pneumococcal serotype 14 (28 carriage and 13 invasive isolates) and two NTPn related to the global pneumococcal clone Spain 9V-3. Overall, 95.4% of the NTPn carriage strains were genetically related to carriage or invasive strains expressing serotype 14. A dominant NTPn lineage was found, that grouped 14 pneumococcal strains. Almost half of the multidrug-resistant isolates grouped into the NTPn cluster.
These findings provide baseline data to assess the impact of the pneumococcal vaccination on the molecular epidemiology of S. pneumoniae. Changes in frequency of NTPn isolates and also genetic changes should be carefully monitored post vaccination, to detect potential vaccine-escape or replacement disease by capsule switched strains, especially in areas where colonization with NTPn has been frequently observed.
PMCID: PMC3769134  PMID: 20637229
molecular epidemiology; non-typeable Streptococcus pneumoniae; carriage; invasive pneumococcal disease
11.  Serial intracameral visualization of the Ahmed glaucoma valve tube by anterior segment optical coherence tomography 
Eye  2012;26(9):1256-1262.
To investigate serial changes of the Ahmed glaucoma valve (AGV) implant tube in the anterior chamber by anterior segment optical coherence tomography (AS-OCT).
Patients who had received AGV implantation without complications (n=48) were included in this study. Each patient received follow-up examinations including AS-OCT at days 1 and 2, week 1, and months 1, 3, 6, and 12. Tube parameters were defined to measure its length and position. The intracameral length of the tube was from the tip of the bevel-edged tube to the sclerolimbal junction. The distance between the extremity of the tube and the anterior iris surface (T–I distance), and the angle between the tube and the posterior endothelial surface of the cornea (T–C angle) were defined. Factors that were related to tube parameters were analysed by multiple regression analysis.
The mean change in tube length was −0.20±0.17 mm, indicating that the tube length shortened from the initial inserted length. The mean T–I distance change was 0.11±0.07 mm and the mean T–C angle change was −6.7±5.6°. Uveitic glaucoma and glaucoma following penetrating keratoplasty showed the most changes in tube parameters. By multiple regression analysis, diagnosis of glaucoma including uveitic glaucoma (P=0.049) and glaucoma following penetrating keratoplasty (P=0.008) were related to the change of intracameral tube length.
These results suggest that the length and position of the AGV tube changes after surgery. The change was prominent in uveitic glaucoma and glaucoma following penetrating keratoplasty.
PMCID: PMC3443837  PMID: 22744388
Ahmed glaucoma valve; anterior segment optical coherence tomography; glaucoma surgery
12.  Correlation of the apparent diffusion coefficiency values on diffusion-weighted imaging with prognostic factors for breast cancer 
The British Journal of Radiology  2012;85(1016):e474-e479.
The aim of this study was to correlate the apparent diffusion coefficient (ADC) value of breast cancer with prognostic factors.
335 patients with invasive ductal carcinoma not otherwise specified (IDC NOS) and ductal carcinoma in situ (DCIS) who underwent breast MRI with diffusion-weighted imaging were included in this study. ADC of breast cancer was calculated using two b factors (0 and 1000 s mm–2). Mean ADCs of IDC NOS and DCIS were compared and evaluated. Among cases of IDC NOS, mean ADCs were compared with lymph node status, size and immunochemical prognostic factors using Student's t-test. ADC was also correlated with histological grade using the Kruskal–Wallis test.
Mean ADC of IDC NOS was significantly lower than that of DCIS (p<0.001). However, the mean ADC of histological grade of IDC NOS was not significantly different (p=0.564). Mean ADC of oestrogen receptor (ER)-positive or progesterone receptor (PR)-positive cancer was significantly lower than that of ER-negative or PR-negative cancer (p=0.003 vs p=0.032). Mean ADC of Ki-67 index-positive cancer was significantly lower than that of Ki-67 index-negative cancer (p=0.028). Mean ADC values of cancers with increased microvascular density (MVD) were significantly lower than those of cancer with no MVD increase (p=0.009). No correlations were observed between mean ADC value and human growth factor receptor 2 expression, tumour size and lymph node metastasis.
Low ADC value was correlated with positive expression of ER, PR, increased Ki-67 index, and increased MVD of breast cancer.
PMCID: PMC3587081  PMID: 22128125
13.  Production of a unique pneumococcal capsule serotype belonging to serogroup 6 
Microbiology (Reading, England)  2009;155(0 2):576-583.
Serogroup 6 of Streptococcus pneumoniae contains three serotypes named 6A, 6B and 6C with highly homologous capsule gene loci. The 6A and 6B capsule gene loci consistently differ from each other by only one nucleotide in the wciP gene. The 6A capsule gene locus has a galactosyl transferase, which has been replaced with a glucosyl transferase in the 6C capsule gene locus. We considered that a new serotype named “6X1” would be possible if the galactosyl transferase of the 6B capsule gene locus is replaced with the glucosyl transferase of 6C. We demonstrate that this gene transfer yields a viable pneumococcal strain and the capsular polysaccharide from this strain has the predicted chemical structure and serologic similarity to the capsular polysaccharide of the 6B serotype. The new strain (i.e., serotype 6X1) is typed as 6B by the quellung reaction but it can be distinguished from 6B strains with monoclonal antibodies to 6B polysaccharide. Reexamination of 264 pneumococcal isolates that were previously typed as 6B with classical typing methods revealed no isolates expressing serotype 6X1. Nevertheless, this study shows this capsular polysaccharide is biochemically possible and could exist/emerge in nature.
PMCID: PMC3706093  PMID: 19202106
pneumococcus; serotype; vaccine
14.  Ultrasonography-guided ethanol ablation of predominantly solid thyroid nodules: a preliminary study for factors that predict the outcome 
The British Journal of Radiology  2012;85(1015):930-936.
The aim of this study was to evaluate the success rate in ultrasonography-guided ethanol ablation (EA) of benign, predominantly solid thyroid nodules and to assess the value of colour Doppler ultrasonography in prediction of its success.
From January 2008 to June 2009, 30 predominantly solid thyroid nodules in 27 patients were enrolled. Differences in the success rate of EA were assessed according to nodule vascularity, nodule size, ratio of cystic component, amount of injected ethanol, degree of intranodular echo-staining just after ethanol injection and the number of EA sessions.
On follow-up ultrasonography after EA for treatment of thyroid nodules, 16 nodules showed an excellent response (90% or greater decrease in volume) and 2 nodules showed a good response (50–90% decrease in volume) on follow-up ultrasonography. However, 5 nodules showed an incomplete response (10–50% decrease in volume) and 7 nodules showed a poor response (10% or less decrease in volume). Statistical analysis revealed a significant association of nodule vascularity (p = 0.002) and degree of intranodular echo-staining just after ethanol injection (p = 0.003) with a successful outcome; however, no such association was observed with regard to nodule size, ratio of cystic component, amount of infused ethanol and the number of EA sessions. No serious complications were observed during or after EA.
The success rate of EA was 60%, and nodule vascularity and intranodular echo-staining on colour Doppler ultrasonography were useful in predicting the success rate of EA for benign, predominantly solid thyroid nodules.
PMCID: PMC3474049  PMID: 22167503
15.  Randomised phase II trial of docetaxel and sunitinib in patients with metastatic gastric cancer who were previously treated with fluoropyrimidine and platinum 
British Journal of Cancer  2012;106(9):1469-1474.
Docetaxel is widely used as a chemotherapeutic agent for gastric cancer treatment. A combined regimen with sunitinib demonstrated a synergistic antitumour effect in a preclinical model. The aim of this study was to evaluate the efficacy and safety of this combination in patients with unresectable or metastatic advanced gastric cancer following failure of treatment with a fluoropyrimidine and platinum combination.
This open-label, phase II, randomised trial enrolled patients with unresectable or metastatic gastric cancer. Patients were assigned to either a docetaxel monotherapy arm (D only arm: 60 mg m−2, every 3 weeks) or a combination arm (DS arm: docetaxel+sunitinib 37.5 mg every day). The primary end point of the study was time to progression and the secondary end points were overall response rate, disease control rate, overall survival, and toxicity profile. A pharmacokinetic study was also performed.
A total of 107 patients were entered into the study. The TTP was not significantly prolonged in the DS arm when compared with the D only arm (DS vs D only arm: 3.9 months (95% confidence interval (CI) 2.9–4.9) vs 2.6 months (95% CI 1.8–3.5) (P=0.206). The hazard ratio for TTP was 0.77 (95% CI 0.52–1.16). However, the objective response rate was significantly higher in the DS arm (41.1% vs 14.3%, P=0.002). Patients in the DS arm experienced stomatitis, diarrhoea, and hand–foot syndrome more frequently.
The addition of sunitinib to docetaxel did not significantly prolong TTP, although it significantly increased response.
PMCID: PMC3341944  PMID: 22460270
gastric cancer; second-line chemotherapy; docetaxel; sunitinib
16.  Correlative light and electron microscopy using cathodoluminescence from nanoparticles with distinguishable colours 
Scientific Reports  2012;2:865.
Correlative light and electron microscopy promises to combine molecular specificity with nanoscale imaging resolution. However, there are substantial technical challenges including reliable co-registration of optical and electron images, and rapid optical signal degradation under electron beam irradiation. Here, we introduce a new approach to solve these problems: imaging of stable optical cathodoluminescence emitted in a scanning electron microscope by nanoparticles with controllable surface chemistry. We demonstrate well-correlated cathodoluminescence and secondary electron images using three species of semiconductor nanoparticles that contain defects providing stable, spectrally-distinguishable cathodoluminescence. We also demonstrate reliable surface functionalization of the particles. The results pave the way for the use of such nanoparticles for targeted labeling of surfaces to provide nanoscale mapping of molecular composition, indicated by cathodoluminescence colour, simultaneously acquired with structural electron images in a single instrument.
PMCID: PMC3498735  PMID: 23155483
17.  A false presence of bifid mandibular canals in panoramic radiographs 
Dentomaxillofacial Radiology  2011;40(7):434-438.
This study was performed in order to verify bifid mandibular canals revealed from panoramic radiographic results.
1000 panoramic radiographs from dental patients and the panorama, cone beam CT (CBCT) and micro-CT from 40 dry mandibles were examined for bifid mandibular canals. The results were confirmed by a stereoscopic and histological examination of the cross-sectioned mandibles.
The prevalence of bifid canals detected from the panoramic radiographs was 0.038. The panoramic radiographs from one dry mandible showed two separate radiolucent mandibular canal-like structures delineated by radio-opaque lines. However, a stereoscopic and histological examination of a cross-section of the mandible showed that only one canal was a true canal containing neurovascular bundles: the other was false, reflecting merely a bony trabecular pattern.
The presence of bifid mandibular canals determined by panoramic radiography should be judged with great caution in relation to dental surgery.
PMCID: PMC3528137  PMID: 21960401
bifid canals; panorama; micro-CT; cone beam computed tomography; inferior alveolar nerve
20.  Diffusion MRI findings of cytomegalovirus-associated ventriculitis: a case report 
The British Journal of Radiology  2011;84(1005):e179-e181.
Cytomegalovirus (CMV) ventriculoencephalitis is a rare but serious potential complication of CMV infection in immunocompromised patients. Characteristic diffusion-weighted imaging findings can be helpful for the diagnosis of CMV ventriculitis, as in this case report.
PMCID: PMC3473774  PMID: 21849359
21.  Development and Validation of Detailed Clinical Models for Nursing Problems in Perinatal care 
Applied Clinical Informatics  2011;2(2):225-239.
The aims of this study were to develop detailed clinical models (DCMs) for nursing problems related to perinatal care and to test the applicability of these detailed clinical models.
First, we extracted entities of nursing problems by analyzing nursing-problem statements from nursing records, reviewing the literature, and interviewing nurse experts. Second, we extracted attributes and possible values needed to describe the entities in more detail by again analyzing nursing statements, reviewing the literature, and consulting nurse experts. Third, DCMs were modeled by linking each entity with possible attributes with value sets and optionalities. Fourth, entities, attributes and value sets in the DCMs were mapped to the International Classification for Nursing Practice (ICNP) version 2. Finally, DCMs were validated by consulting a group of experts and by applying them to real clinical data and nursing care scenarios published in the literature. The adequacy of the entities, attributes, value sets, and optionalities of the attributes were validated.
Fifty-eight entities were identified, 41 entities from nursing records, 12 entities from literature review and 5 entities from nurse experts. Sixty-five attributes with values were identified, 25 attributes from nursing records, 34 attributes from literature review, and 6 attributes from nurse experts. In total 58 DCMs were developed and validated.
The DCMs developed in this study can ensure that electronic health records contain meaningful and valid information, and support the semantic interoperability of nursing information.
PMCID: PMC3631923  PMID: 23616872
Information sharing, model, standards; data collection; knowledge representation
23.  Unraveling the sequence dynamics of the formation of genus-specific satellite DNAs in the family solanaceae 
Heredity  2010;106(5):876-885.
Tandemly repeated DNAs, referred to as satellite DNAs, often occur in a genome in a genus-specific manner. However, the mechanisms for generation and evolution for these sequences are largely unknown because of the uncertain origins of the satellite DNAs. We found highly divergent genus-specific satellite DNAs that showed sequence similarity with genus-specific intergenic spacers (IGSs) in the family Solanaceae, which includes the genera Nicotiana, Solanum and Capsicum. The conserved position of the IGS between 25S and 18S rDNA facilitates comparison of IGS sequences across genera, even in the presence of very low sequence similarity. Sequence comparison of IGS may elucidate the procedure of the genesis of complex monomer units of the satellite DNAs. Within the IGS of Capsicum species, base substitutions and copy number variation of subrepeat monomers were causes of monomer divergence in IGS sequences. At the level of inter-generic IGS sequences of the family Solanaceae, however, genus-specific motif selection, motif shuffling between subrepeats and differential amplification among motifs were involved in formation of genus-specific IGS. Therefore, the genus-specific satellite DNAs in Solanaceae plants can be generated from differentially organized repeat monomers of the IGS rather than by accumulation of mutations from pre-existent satellite DNAs.
PMCID: PMC3186232  PMID: 21063436
Solanaceae; genus specific; satellite DNA; intergenic spacer (IGS)
24.  Immature Rubus coreanus Shows a Free Radical-Scavenging Effect and Inhibits Cholesterol Synthesis and Secretion in Liver Cells 
Rubus coreanus fruits have been employed as a traditional medicine for centuries in the Asia-Pacific region. Its pharmacological action differs according to the different extraction methods utilized and the degree of fruit ripening. In this study, we determined the cellular effect of different ethanol extracts of mature and immature Rubus coreanus fruits in human hepatic cell line, HepG2 cells. The antioxidant activity, effect on superoxide dismutase activity and cholesterol biosynthesis efficiency was also evaluated. Immature Rubus coreanus extract showed higher antioxidant capability, compared with that of its mature fractions. Cellular antioxidant proteins including HO-1, Cu/Zn-superoxide dismutase and catalase were highly expressed in the presence of Rubus coreanus. Cholesterol levels in HepG2 cells treated with the water fraction of immature Rubus coreanus were significantly reduced. This antihyperlipidaemic action of Rubus coreanus is a consequence of cholesterol biosynthesis and extracellular secretion in HepG2 cells. These results indicate that among different ethanol fraction of mature and immature Rubus coreanus fruit extracts, water extract of immature fruit extract shows higher antioxidant as well as higher antihyperlipidaemic action.
PMCID: PMC3574530  PMID: 23440938
Antioxidant; antihyperlipidaemic; cholesterol; bokbunza; Rubus coreanus
25.  Activation of autophagy induces retinal ganglion cell death in a chronic hypertensive glaucoma model 
Cell Death & Disease  2012;3(4):e290-.
Autophagy is reported to have important roles in relation to regulated cell death pathways and neurodegeneration. This study used chronic hypertensive glaucoma rat model to investigate whether the autophagy pathway has a role in the apoptosis of retinal ganglion cells (RGCs) after chronic intraocular pressure (IOP) elevation. Under electron microscopy, autophagosomes were markedly accumulated in the dendrites and cytoplasm of RGCs after IOP elevation. Western blot analysis showed that LC3-II/LC3-I and beclin-1 were upregulated throughout the 8-weeks period after IOP elevation. The pattern of LC3 immunostaining showed autophagy activation in the cytoplasm of RGCs to increase and peak at 4 weeks after IOP elevation. Most of these LC3B-positive RGCs underwent apoptosis by terminal deoxynucleotidyltransferase-mediated biotinylated UTP nick end labeling, and inhibition of autophagy with 3-methyladenine decreased RGC apoptosis. The activated pattern shows that autophagy is initially activated in the dendrites of the RGCs, but, thereafter autophagy is mainly activated in the cytoplasm of RGCs. This may show that autophagy is differently regulated in different compartments of the neuron. This present study showed that autophgy is activated in RGCs and has a role in autophagic cell death after chronic IOP elevation.
PMCID: PMC3358006  PMID: 22476098
retinal ganglion cell; glaucoma; autophagy

Results 1-25 (191)