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1.  Multiplanar 3D ultrasound imaging to assess the anatomy of the upper airway and measure the subglottic and tracheal diameters in adults 
The British Journal of Radiology  2013;86(1030):20130253.
To evaluate the feasibility of using three-dimensional (3D) ultrasound to assess the anatomy of the airway.
11 young volunteers were recruited for 3D ultrasound and MRI of the airway. 3D ultrasound data were obtained from the level of the true vocal cords, cricoid cartilage and upper trachea. Multiplanar 3D ultrasound images were rendered and compared visually with corresponding MRI and cadaver anatomical sections. The anteroposterior (AP) and transverse diameter of the subglottic space and transverse diameter of the upper trachea were also measured in the 3D ultrasound and MR images and compared.
The airway anatomy was clearly delineated in the multiplanar 3D ultrasound images. It was also possible to identify the cricothyroid junction, and a simple method to measure the AP diameter of the subglottic space using this landmark is described. We were also able to accurately measure the transverse diameter of the upper trachea, but the transverse diameter of the subglottic space was overestimated using ultrasound. There was a strong correlation for the AP diameter measurement (r=0.94, p<0.05) and moderate correlation for the transverse diameter measurement (r=0.82, p=0.002) of the subglottic space, and a strong correlation for the transverse diameter measurement (r=0.91, p<0.05) of the upper trachea, in the ultrasound and MR images.
The anatomy of the adult airway can be assessed using 3D ultrasound. It can also be used to accurately measure the AP diameter of the subglottic space and the transverse diameter of the upper trachea.
Advances in knowledge:
This is the first report to describe the use of 3D ultrasound to evaluate the anatomy of the upper airway and accurately measure the AP diameter of the subglottic space and the transverse diameter of the upper trachea.
PMCID: PMC3798330  PMID: 23966375
2.  Response to ‘Alternative diagnoses with ectopia lentis' 
Eye  2011;26(3):481-482.
PMCID: PMC3298994
4.  Antiphospholipid antibodies are associated with enhanced oxidative stress, decreased plasma nitric oxide and paraoxonase activity in an experimental mouse model 
Rheumatology (Oxford, England)  2005;44(10):1238-1244.
Oxidative stress contributes to atherosclerosis, and evidence of enhanced oxidative stress exists in antiphospholipid syndrome (APS). In a non-lupus murine model, we evaluated whether anticardiolipin (aCL) antibodies could affect the oxidant/antioxidant balance as an early biochemical step of APS.
Hybridomas producing human and murine aCL and anti-β2-glycoprotein I (aβ2-GPI) monoclonal antibodies were injected into three groups of five female BALB/c severe combined immunodeficiency (SCID) mice. Corresponding hybridomas secreting non-antiphospholipid antibodies of the same isotype were employed as controls. Sera and organs were collected after 30 days. Paraoxonase (PON) activity, peroxynitrite, superoxide, nitric oxide (NO) and nitrotyrosine were measured in plasma. Expression of endothelial nitric oxide synthase and inducible nitric oxide synthase (iNOS) was assessed by western blot and immunohistochemistry.
PON activity and NO (sum of nitrate and nitrite) levels were reduced in the human aCL IgG group (P<0.002 and P<0.04, respectively), whilst peroxynitrite and superoxide and expression of total antioxidant capacity of plasma were increased (P<0.01). PON and NO were decreased in the murine aβ2-GPI IgG and IgM aCL groups (P<0.03 and P<0.05, respectively). Nitrotyrosine was elevated in the human aCL IgG group (P<0.03). Western blotting showed reduced iNOS expression in the hearts of the IgG aCL group, confirmed by immunostaining. PON inversely correlated with IgG aCL titres (P<0.001), superoxide (P<0.008) and peroxynitrite levels (P<0.0009). Peroxynitrite and total IgG aCL were independent predictors of PON (P<0.0009 and P<0.02, respectively). Superoxide was the only independent predictor of NO (P<0.008) and of nitrotyrosine (P<0.002).
aCL antibodies are associated with the decreased PON activity and reduced NO that may occur in the preclinical phase of APS.
PMCID: PMC3465365  PMID: 15987712 CAMSID: cams2349
Antiphospholipid antibodies; Oxidative stress; Nitric oxide; Total antioxidant capacity; Paraoxonase
5.  Angle closure glaucoma associated with ectopia lentis in a patient with Sturge-Weber syndrome 
Eye  2011;25(9):1235-1236.
PMCID: PMC3178240  PMID: 21546921
6.  Involvement of Cyr61 in growth, migration, and metastasis of prostate cancer cells 
British Journal of Cancer  2008;99(10):1656-1667.
Cyr61 has been reported to participate in the development and progression of various cancers; however, its role in prostate cancer (PCa) still remains poorly understood. In this study, we explored the function of Cyr61 in a series of malignant PCa cell lines, including LnCap, Du145, and PC3. 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) and crystal violet assays demonstrated that Cyr61 was essential for the proliferation of PCa cells. Soft agar assay and xenograft analysis showed that downregulation of Cyr61 suppressed the tumorigenicity of Du145 cells both in vitro and in vivo. Either silencing the cellular Cyr61 by RNA interference or neutralising the endogenous Cyr61 by antibody inhibited the migration of Du145 cells. In contrast, purified protein of Cyr61 promoted the migration of LnCap cells in a dose-dependent manner. These results suggested that Cyr61 was involved in the migration of PCa cells. We also observed the accumulation of mature focal adhesion complexes associated with the impaired migration through Cyr61 downregulation. Also, further studies showed that Cyr61 regulated the level of activated Rac1 as well as its downstream targets, including phosphorylated JNK, E-cadherin, and p27kip1, which are key molecules involved in cell growth, migration, and invasion. The in vivo mouse tail vein injection experiment revealed that Cyr61 affected the metastatic capacity of Du145 cells, suggesting that Cyr61 was required for prostate tumour metastasis. Altogether, our results demonstrated that Cyr61 played an important role in the tumorigenicity and metastasis of PCa cells, which will benefit the development of therapeutic strategy for PCas.
PMCID: PMC2584944  PMID: 18941464
PCa; Du145; Cyr61; Rac1
7.  A highly informative probe for two polymorphic Vh gene regions that contain one or more autoantibody-associated Vh genes. 
Journal of Clinical Investigation  1989;84(2):706-710.
Efforts to determine the role of specific Ig variable region (V) genes in human autoimmune responses have been hampered by the lack of suitably polymorphic probes. Recently we isolated a heavy chain V (Vh) gene, designated Humhv3005, that is 99% homologous to the 1.9III Vh gene and can encode an anti-DNA antibody. To study the relation between these two genes, different DNA fragments from the isolated Humhv3005 clone were used to probe Southern blots of human genomic DNA. A 1.6-kb Eco RI fragment (designated hv3005/E1.6) was found to hybridize with only one band in Eco RI-digested DNA, and with two major bands in Bam HI-digested DNA. Importantly, the sizes of the latter two bands were indistinguishable from the corresponding Bam HI fragment sizes of the isolated hv3005 clone and the isolated 1.9III clone, respectively. Population and family studies with the hv3005/E1.6 probe revealed five different hybridization patterns of these two characteristic bands, which defined nine possible genotypes for two human Ig Vh gene loci. Together the data demonstrate that hv3005/E1.6 is a highly informative probe for an autoantibody-associated Vh gene(s), and should prove useful in elucidating the role of Ig Vh genes in autoimmune diseases.
PMCID: PMC548935  PMID: 2569476
9.  The human immunoglobulin V(H) gene repertoire is genetically controlled and unaltered by chronic autoimmune stimulation. 
Journal of Clinical Investigation  1996;98(12):2794-2800.
The factors controlling immunoglobulin (Ig) gene repertoire formation are poorly understood. Studies on monozygotic twins have helped discern the contributions of genetic versus environmental factors on expressed traits. In the present experiments, we applied a novel anchored PCR-ELISA system to compare the heavy chain V gene (V(H)) subgroup repertoires of mu and gamma expressing B lymphocytes from ten pairs of adult monozygotic twins, including eight pairs who are concordant or discordant for rheumatoid arthritis. The results disclosed that the relative expression of each Ig V(H) gene subgroup is not precisely proportional to its relative genomic size. The monozygotic twins had more similar IgM V(H) gene repertoires than did unrelated subjects. Moreover, monozygotic twins who are discordant for RA also use highly similar IgM V(H) gene-subgroup repertoires. Finally, the V(H) gene repertoire remained stable over time. Collectively, these data reveal that genetic factors predominantly control V(H) gene repertoire formation.
PMCID: PMC507745  PMID: 8981926
10.  Population and family studies of three disease-related polymorphic genes in systemic lupus erythematosus. 
Journal of Clinical Investigation  1995;95(4):1766-1772.
The contribution to systemic lupus erythematosus (SLE) of three lupus-associated polymorphisms (involving the C4A2 complement component, Humhv3005 and the T cell antigen receptor alpha chain gene) are investigated in 81 individuals from 14 multiplex SLE families, 41 unrelated lupus patients, and 88 unrelated healthy controls. The results show a strong association between C4A deletion and SLE in these families. While the current study confirms the previously reported association between hv3005 deletion and sporadic SLE, the study fails to support this association in familial SLE patients. Moreover, no correlation is detected between the occurrence of hv3005 deletion and C4A null alleles in lupus patients, suggesting that the effects of these genetic polymorphisms on predisposition to lupus are independent. The previously reported lupus-associated T cell receptor (TCR) alpha chain polymorphism is not detected in any of the individuals studied here. The combined data suggest that C4A null alleles predispose strongly to development of lupus, whereas the influence of hv3005 deletion is relatively weak. The results also suggest that contributions of weak susceptibility genes such as hv3005 to disease predisposition may be obscured by the effects of stronger genetic factors and thus need to be examined in patients lacking these factors.
PMCID: PMC295700  PMID: 7706484
11.  Defining the genetic origins of three rheumatoid synovium-derived IgG rheumatoid factors. 
Journal of Clinical Investigation  1994;93(6):2545-2553.
A major diagnostic marker in most rheumatoid arthritis (RA) patients is the rheumatoid factor (RF), an autoantibody that binds to the Fc region of IgG. To delineate the Ig genes and the underlying mechanism for RF production in RA patients, we applied a systematic approach to define the genetic origins of three IgG RFs derived from the synovial fluid of two RA patients. The results show that two of three IgG RF have substantial numbers of somatic mutations in their variable (V) regions, ranging from 13 to 23 mutations over a stretch of 291-313 nucleotides, resulting in a frequency of 4.4-7.8%. However, one IgG RF has only one mutation in each V region. This result indicates that an IgG RF may arise from a germline gene by very few mutations. The mutations occur mainly in the complementarity-determining regions (CDRs), and the mutations in the CDRs often lead to amino acid substitutions. Five of the six corresponding germline V genes have been found to encode either natural autoantibodies or autoantibodies in other autoimmune disorders; and three of the six V genes have been found in fetal liver. Taken together with other results, the data show that (a) several potentially pathogenic RFs in RA patients arise from natural autoantibodies, and (b) only a few mutations are required to convert the natural autoantibodies to IgG RFs.
PMCID: PMC294479  PMID: 8200991
12.  Regulation of the mature human T cell receptor gamma repertoire by biased V-J gene rearrangement. 
Journal of Clinical Investigation  1993;91(1):171-178.
To delineate how gene rearrangement influences the expressed human gamma delta T cell repertoire, we generated T cell receptor gamma (TCR gamma) V domain-specific cDNA libraries from the peripheral lymphocytes of eight donors and sequenced a total of 232 TCR gamma gene transcripts. The libraries consisted of both in-frame and out-of-frame rearranged TCR gamma genes. The in-frame TCR gamma gene transcripts were used to determine the diversity of functional T cells, whereas the out-of-frame transcripts, primarily derived from alpha beta T cells, were used to assess the frequencies of TCR V gamma-J gamma rearrangements in progenitor T lymphocytes. The results showed that both sets of transcripts exhibited strikingly restricted V gamma-J gamma combinations. Only 11 of 40 potential V gamma-J gamma rearrangements were common ( > or = 3% of total). The pattern of gene usage in the functional and nonfunctional transcripts was similar and did not differ markedly among donors. The only exception was the predominance of V gamma 9-JP in potentially functional transcripts from seven of eight individuals. These results show that V gamma-J gamma rearrangement is nonrandom and suggest that the diversity of TCR gamma genes in the functional gamma delta T cell repertoire partly depends upon preferentially rearranged V gamma-J gamma gene combinations. However, the expansion of V gamma 9/V gamma 2 T cells in adult peripheral blood can only be explained by antigenic selection of relatively rare V gamma 9-JP recombinants.
PMCID: PMC330011  PMID: 7678601
13.  Sequence analyses of three immunoglobulin G anti-virus antibodies reveal their utilization of autoantibody-related immunoglobulin Vh genes, but not V lambda genes. 
Journal of Clinical Investigation  1992;90(6):2197-2208.
Accumulated sequence analyses of the antibody repertoire have revealed that most autoantibodies and developmentally regulated antibodies share a small set of germline Ig-variable region (V) genes. The findings have prompted speculation that certain autoantibodies are of developmental importance and may be instrumental in maintaining homeostasis of the adult antibody repertoire. In order to evaluate this hypothesis critically, it is first necessary to determine the V gene usage in human antibodies against foreign substances. Unfortunately, only a few such antibodies have had their heavy and light chains characterized. To rectify the situation, we adapted the anchored polymerase chain reaction to clone and analyze rapidly the expressed V genes for three anti-virus IgG antibodies. The results show that all three heavy chain V (Vh) genes are highly homologous to the known autoantibody-related Vh genes. In contrast, two light chain V (VL) genes of the V lambda 1 subgroup are similar to a non-autoantibody-related germline V lambda 1 gene. Taken together with the reported Vh and VL sequences of several antibodies against viruses and bacteria, the data show that many antipathogen antibodies may use the same small set of Vh genes that encode autoantibodies, but diverse VL genes that are distinct from autoantibody-related VL genes. Thus, only a small portion of the potentially functional germline Vh genes are used recurrently to generate most antibodies in a normal antibody repertoire, regardless of their reactivities with either self or non-self.
PMCID: PMC443370  PMID: 1334971
14.  Molecular basis of an autoantibody-associated restriction fragment length polymorphism that confers susceptibility to autoimmune diseases. 
Journal of Clinical Investigation  1991;88(1):193-203.
Recently, combined serological and molecular studies of autoantibodies have revealed that these antibodies play an important role in the normal function of the immune system and in the development of the B cell repertoire. Accordingly, we hypothesized that a homozygous deletion of a critical autoantibody-associated Ig variable (V) gene may alter the immune system and thus predispose the host to autoimmune disorders. Initial experiments revealed several restriction fragment length polymorphisms (RFLP) of the Humhv3005 gene, that is likely to encode heavy chains of rheumatoid factors, and the closely related 1.9III gene. By probing EcoR1-digested DNA with the Humhv3005/P1 probe, we found that one of the four major hybridizing bands was missing in approximately 20% of patients with either rheumatoid arthritis or systemic lupus erythematosus, but only 2% of normal subjects. To delineate the genetic basis of this polymorphism, we have now employed the PCR to amplify and analyze hv3005, 1.9III, and homologous genes in individuals with characteristic RFLP genotypes. Our results indicate that the human Vh gene repertoire contains several hv3005- and 1.9III-like genes, and that a complete deletion of the hv3005-like genes is relatively restricted to a subset of autoimmune patients. These findings provide initial evidence for deletion of developmentally regulated autoreactive V genes in autoimmune diseases.
PMCID: PMC296020  PMID: 1676037
15.  New roles for rheumatoid factor. 
Journal of Clinical Investigation  1991;87(2):379-383.
PMCID: PMC295087  PMID: 1991824
16.  A natural autoantibody is encoded by germline heavy and lambda light chain variable region genes without somatic mutation. 
Journal of Clinical Investigation  1989;84(5):1675-1678.
While nonmutated germline variable region (V) genes have been found to encode heavy or light chains of various human autoantibodies, the use of germline V genes by both chains of a given autoantibody has not been documented. Recently, we reported that the heavy chain V gene (designated Humha346) of the Kim4.6 anti-DNA antibody is identical to a germline VH gene, 1.9III. To investigate whether this autoantibody was entirely germline encoded, we searched for the germline counterpart to the Kim4.6 V lambda segment (designated Humla146) and isolated a V lambda I gene designated Humlv117, which was identical to Humla146. Together with the sequence identity of the Kim4.6/Humha346 and 1.9III VH genes, the current data provide the first direct proof that an autoantibody can be encoded entirely by germline V genes without any somatic change. In addition, Humlv117 is the first V lambda I germline gene that has been isolated, and is highly homologous to the V lambda genes expressed in two lymphomas. Thus, this V lambda I gene should provide a useful tool for investigating the expression of the human V lambda gene repertoire, particularly with regard to autoimmune and/or lymphoproliferative diseases.
PMCID: PMC304036  PMID: 2509520

Results 1-16 (16)