201
|
Zhao A, Diener T, Gao S, Greskovich J, Wilkinson D. SU-G-TeP2-07: Dosimetric Characterization of a New HDR Multi-Channel Esophageal Applicator for Brachytherapy. Med Phys 2016. [DOI: 10.1118/1.4957042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
202
|
Li CJ, Jiang YW, Chen SX, Li HJ, Chen L, Liu YT, Gao S, Zhao Y, Zhu XL, Wang HT, Wang FG, Zheng L, Zhou X. 4-Methylcatechol inhibits cell growth and testosterone production in TM3 Leydig cells by reducing mitochondrial activity. Andrologia 2016; 49. [PMID: 27147129 DOI: 10.1111/and.12581] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/30/2016] [Indexed: 01/20/2023] Open
Abstract
4-Methylcatechol (4-MC) is a potential neuroprotective drug because it stimulates the synthesis of brain-derived neurotrophic factor (BDNF) and nerve growth factor (NGF) in neurons. The present study explored the effect of 4-MC on cell growth and testosterone synthesis in the TM3 Leydig cells of mice. 4-MC did not enhance expression of both BDNF and NGF in these cells. However, this compound significantly inhibited cell proliferation and increased the number of apoptotic cells in a dose-dependent manner. The expression profile of Bax/Bcl-2 gene was altered considerably, and mitochondrial activity was significantly decreased in cells. 4-Methylcatechol also inhibited testosterone synthesis in TM3 Leydig cells. The inhibitory roles of this compound in relation to growth and testosterone synthesis in TM3 Leydig cells maybe associated with increased Bax gene expression and decreased mitochondrial activity. As a result, caspase cascade is activated.
Collapse
|
203
|
Zhang GM, Zou YX, Feng X, Gao S. [Retrospective analysis of operative methods and complications in 29 patients with carotid body tumor]. LIN CHUANG ER BI YAN HOU TOU JING WAI KE ZA ZHI = JOURNAL OF CLINICAL OTORHINOLARYNGOLOGY, HEAD, AND NECK SURGERY 2016; 30:630-632. [PMID: 29871094 DOI: 10.13201/j.issn.1001-1781.2016.08.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Indexed: 11/12/2022]
Abstract
Objective:To analyze the operative methods and complications for surgical resection of carotid body tumor (CBT). Method:Clinical data of 29 patients underwent CBT resection from Jan 2007 to Apr 2015 were retrospectively studied. Result:Five out of 29 patients got bilateral CBT, the others had unilateral lesions, totally 34 CBT resection were performed. Tumor completely dissected without carotid artery clamping and reconstruction in 18 procedures, tumor resection combined with external carotid artery resection in 16 procedures, 9 out of these 16 procedures combined with internal carotid artery resection. The internal carotid artery was reconstructed with autologous greater saphenous vein in 4 procedures, with artificial graft in 3 procedures, and internal carotid artery ligation without reconstruction in 2 procedures. There was no patient death during perioperative period, cerebral infarction happened in 1 patient and cranial nerve injury occurred in 12 cases. Conclusion:Carotid artery resection and reconstruction is very common during CBT resection, surgeon must be familiar with the methods of carotid artery reconstruction, and the most common complication of carotid body tumor resection is the cranial nerve injury.
Collapse
|
204
|
Dong HJ, Wu W, Wang JH, Zhu HF, Gao S, Hou LP, Bai QX. [Acute myeloid leukemia complicated with complex karyotypes and T-lymphoblastic lymphoma: a case report]. ZHONGHUA XUE YE XUE ZA ZHI = ZHONGHUA XUEYEXUE ZAZHI 2016; 37:237. [PMID: 27033763 PMCID: PMC7342941 DOI: 10.3760/cma.j.issn.0253-2727.2016.03.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
205
|
Yu S, Gao S, Gan Y, Zhang Y, Ruan X, Wang Y, Yang L, Shi J. QSAR models for predicting octanol/water and organic carbon/water partition coefficients of polychlorinated biphenyls. SAR AND QSAR IN ENVIRONMENTAL RESEARCH 2016; 27:249-63. [PMID: 26998720 DOI: 10.1080/1062936x.2016.1158734] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Quantitative structure-property relationship modelling can be a valuable alternative method to replace or reduce experimental testing. In particular, some endpoints such as octanol-water (KOW) and organic carbon-water (KOC) partition coefficients of polychlorinated biphenyls (PCBs) are easier to predict and various models have been already developed. In this paper, two different methods, which are multiple linear regression based on the descriptors generated using Dragon software and hologram quantitative structure-activity relationships, were employed to predict suspended particulate matter (SPM) derived log KOC and generator column, shake flask and slow stirring method derived log KOW values of 209 PCBs. The predictive ability of the derived models was validated using a test set. The performances of all these models were compared with EPI Suite™ software. The results indicated that the proposed models were robust and satisfactory, and could provide feasible and promising tools for the rapid assessment of the SPM derived log KOC and generator column, shake flask and slow stirring method derived log KOW values of PCBs.
Collapse
|
206
|
Kodama H, Gao S, Monette S, Reilly J, Solomon S, Srimathveeravalli G. Feasibility and acute safety following catheter directed endoluminal in vivo irreversible electroporation of porcine bronchus. J Vasc Interv Radiol 2016. [DOI: 10.1016/j.jvir.2015.12.657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|
207
|
Gao S, Fan YC, Wang K. Letter: aberrant GSTP1 promoter methylation in acute-on-chronic hepatitis B liver failure--authors' reply. Aliment Pharmacol Ther 2016; 43:748. [PMID: 26876288 DOI: 10.1111/apt.13533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/08/2022]
|
208
|
Li Y, Wang S, Gao S, Yang C, Yang W, Guo S. Laparoscopic colorectal resection versus open colorectal resection in octogenarians: a systematic review and meta-analysis of safety and efficacy. Tech Coloproctol 2016; 20:153-62. [PMID: 26783029 DOI: 10.1007/s10151-015-1419-x] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2015] [Accepted: 12/25/2015] [Indexed: 01/01/2023]
Abstract
Octogenarians are more often viewed as high-risk surgical candidates. This increased risk is attributed to an age-related decline in physical function and reserve capacity coupled with the presence of various underlying diseases. There are no current guidelines or consensus on the optimal treatment strategy for this cohort of complex patients. The aim of this systematic review and meta-analysis was to compare the efficacy and safety of laparoscopic colorectal resection versus open colorectal resection in octogenarians. The meta-analysis was conducted following all aspects of the Cochrane Handbook for Systematic Reviews and Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement. A systematic literature review was carried out using the following databases: MEDLINE, Embase, PubMed, the Cochrane Library, Google Scholar and OVID. Only studies comparing outcome of laparoscopic and open colorectal resections in the elderly population (≥80 years) were selected. The data collected included the patient demographics, interventions, observed outcome and sources of bias. When performing the statistical analysis, we used the odds ratio for categorical variables and the weighted mean difference for continuous variables. The results of this systematic review and pooled analysis demonstrated the safety and potential benefits of laparoscopic colorectal resection in octogenarians. LC can reduce the length of hospital stay, intraoperative blood loss, time to return of normal bowel function, and incidence of postoperative pneumonia, wound infection, and postoperative ileus.
Collapse
|
209
|
Su L, Jin Y, Unverzagt FW, Liang C, Cheng Y, Hake AM, Kuruppu D, Ma F, Liu J, Chen C, Bian J, Li P, Gao S. Longitudinal Association between Selenium Levels and Hypertension in a Rural Elderly Chinese Cohort. J Nutr Health Aging 2016; 20:983-988. [PMID: 27925137 DOI: 10.1007/s12603-016-0700-7] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
OBJECTIVES Results from previous studies have been inconsistent on the association between selenium and hypertension, and very few studies on this subject have focused on the elderly population. The purpose of this study is to examine the relationship between selenium level and hypertension in a rural elderly Chinese cohort. DESIGN A longitudinal study was implemented and data were analyzed using logistic regression models and Cox proportional hazards regression model adjusting for potential confounders. The associations between selenium level and prevalent hypertension at baseline and between selenium and incident hypertension were examined. SETTING Community-based setting in four rural areas in China. SUBJECTS A total of 2000 elderly aged 65 years and over (mean 71.9±5.6 years) participated in this study. MEASUREMENTS Nail selenium levels were measured in all subjects at baseline. Blood pressure measures and self-reported hypertension history were collected at baseline, 2.5 years and 7 years later. Hypertension was defined as systolic blood pressure 140 mmHg or higher, diastolic blood pressure 90 mmHg or higher, or reported use of anti-hypertensive medication. RESULTS The rate of baseline hypertension was 63.50% in this cohort and the mean nail selenium level is 0.413±0.183μg/g. Multi-covariate adjusted cross-sectional analyses indicated that higher selenium level was associated with higher blood pressure measures at baseline and higher rates of hypertension. For the 635 participants with normal blood pressure at baseline, 360 had developed hypertension during follow-up. The incidence rate for hypertension was 45.83%, 52.27%, 62.50%, 70.48%, and 62.79% from the first selenium quintile to the fifth quintile respectively. Comparing to the lowest quintile group, the hazard ratios were 1.41 (95%CI: 1.03 to1.94), 1.93 (95%CI: 1.40 to 2.67), 2.35 (95%CI: 1.69 to 3.26) and 1.94 (95%CI: 1.36 to 22.77) for the second selenium quintile to the fifth quintile respectively. CONCLUSIONS Our findings suggest that high selenium may play a harmful role in the development of hypertension. Future studies are needed to confirm our findings and to elucidate a plausible biological mechanism.
Collapse
|
210
|
Zhang H, Yuan S, Liu N, Gao S, Wei Y, Fu Z, Hu X, Wang S, Zhao W. Can a Novel 18F-ALF-NOTA-PRGD2 PET/CT Predict the Treatment Sensitivity of Concurrent Chemoradiation Therapy in Patients With Newly Diagnostic Glioblastoma? Int J Radiat Oncol Biol Phys 2015. [DOI: 10.1016/j.ijrobp.2015.07.757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
211
|
Wang S, Yuan S, Gao S, Li W, Zhao S, Teng X, Lu H, Zheng J, Ma L, Fu Z. Prediction of Response By RGD PET During Radiation Therapy for Esophageal Squamous Cell Carcinoma: A Pilot Study. Int J Radiat Oncol Biol Phys 2015. [DOI: 10.1016/j.ijrobp.2015.07.923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
212
|
Gao S, Yuan S, Li W, Zhao S, Teng X, Lu H, Fu Z, Zheng J, Ma L, Yu J. Evaluation of Benign Versus Malignant Lung Lesions With RGD PET/CT: A Pilot Study. Int J Radiat Oncol Biol Phys 2015. [DOI: 10.1016/j.ijrobp.2015.07.1606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
213
|
Liu ZH, Hu JL, Liang JZ, Zhou AJ, Li MZ, Yan SM, Zhang X, Gao S, Chen L, Zhong Q, Zeng MS. Far upstream element-binding protein 1 is a prognostic biomarker and promotes nasopharyngeal carcinoma progression. Cell Death Dis 2015; 6:e1920. [PMID: 26469968 PMCID: PMC4632288 DOI: 10.1038/cddis.2015.258] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2015] [Revised: 07/20/2015] [Accepted: 07/20/2015] [Indexed: 02/06/2023]
Abstract
Nasopharyngeal carcinoma (NPC) is a malignant epithelial tumor with tremendous invasion and metastasis capacities, and it has a high incidence in southeast Asia and southern China. Previous studies identified that far upstream element-binding protein 1 (FBP1), a transcriptional regulator of c-Myc that is one of the most frequently aberrantly expressed oncogenes in various human cancers, including NPC, is an important biomarker for many cancers. Our study aimed to investigate the expression and function of FBP1 in human NPC. Quantitative real-time RT-PCR (qRT-PCR), western blot and immunohistochemical staining (IHC) were performed in NPC cells and biopsies. Furthermore, the effect of FBP1 knockdown on cell proliferation, colony formation, side population tests and tumorigenesis in nude mice were measured by MTT, clonogenicity analysis, flow cytometry and a xenograft model, respectively. The results showed that the mRNA and protein levels of FBP1, which are positively correlated with c-Myc expression, were substantially higher in NPC than that in nasopharyngeal epithelial cells. IHC revealed that the patients with high FBP1 expression had a significantly poorer prognosis compared with the patients with low expression (P=0.020). In univariate analysis, high FBP1 and c-Myc expression predicted poorer overall survival (OS) and poorer progression-free survival. Multivariate analysis indicated that high FBP1 and c-Myc expression were independent prognostic markers. Knockdown of FBP1 reduced cell proliferation, clonogenicity and the ratio of side populations, as well as tumorigenesis in nude mice. These data indicate that FBP1 expression, which is closely correlated with c-Myc expression, is an independent prognostic factor and promotes NPC progression. Our results suggest that FBP1 can not only serve as a useful prognostic biomarker for NPC but also as a potential therapeutic target for NPC patients.
Collapse
|
214
|
Jiang Y, Jiang J, Feng H, Gao S, Liu X, Wang S, Ma X, Cen X, Tang Y, Liang X. PRRX1 induces the reprogramming of free fatty acids metabolism and fuels the progression of oral squamous cell carcinomas. Int J Oral Maxillofac Surg 2015. [DOI: 10.1016/j.ijom.2015.08.153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
215
|
Chen J, Schneider K, Gao S, Vogel R, Heinrich G. In-situ synchrotron X-ray studies of crystallization of β-nucleated iPP subjected to a wide range of shear rates and shear temperatures. POLYMER 2015. [DOI: 10.1016/j.polymer.2015.08.042] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
216
|
Lindeman A, Dawkins E, Gao S. Clothing Weight Adjustments When Determining Body Mass Index for Schoolchildren Grades K-12. J Acad Nutr Diet 2015. [DOI: 10.1016/j.jand.2015.06.051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
217
|
Gao S, Sun FK, Fan YC, Shi CH, Zhang ZH, Wang LY, Wang K. Aberrant GSTP1 promoter methylation predicts short-term prognosis in acute-on-chronic hepatitis B liver failure. Aliment Pharmacol Ther 2015; 42:319-29. [PMID: 26040771 DOI: 10.1111/apt.13271] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/01/2014] [Revised: 12/28/2014] [Accepted: 05/20/2015] [Indexed: 12/13/2022]
Abstract
BACKGROUND Glutathione-S-transferase P1 (GSTP1) methylation has been demonstrated to be associated with oxidative stress induced liver damage in acute-on-chronic hepatitis B liver failure (ACHBLF). AIM To evaluate the methylation level of GSTP1 promoter in acute-on-chronic hepatitis B liver failure and determine its predictive value for prognosis. METHODS One hundred and five patients with acute-on-chronic hepatitis B liver failure, 86 with chronic hepatitis B (CHB) and 30 healthy controls (HC) were retrospectively enrolled. GSTP1 methylation level in peripheral mononuclear cells (PBMC) was detected by MethyLight. Clinical and laboratory parameters were obtained. RESULTS GSTP1 methylation levels were significantly higher in patients with acute-on-chronic hepatitis B liver failure (median 16.84%, interquartile range 1.83-59.05%) than those with CHB (median 1.25%, interquartile range 0.48-2.47%; P < 0.01) and HC (median 0.80%, interquartile range 0.67-1.27%; P < 0.01). In acute-on-chronic hepatitis B liver failure group, nonsurvivors showed significantly higher GSTP1 methylation levels (P < 0.05) than survivors. GSTP1 methylation level was significantly correlated with total bilirubin (r = 0.29, P < 0.01), prothrombin time activity (r = -0.24, P = 0.01) and model for end-stage liver disease (MELD) score (r = 0.26, P = 0.01). When used to predict 1- or 2-month mortality of acute-on-chronic hepatitis B liver failure, GSTP1 methylation showed significantly better predictive value than MELD score [area under the receiver operating characteristic curve (AUC) 0.89 vs. 0.72, P < 0.01; AUC 0.83 vs. 0.70, P < 0.05 respectively]. Meanwhile, patients with GSTP1 methylation levels above the cut-off points showed significantly poorer survival than those below (P < 0.05). CONCLUSIONS Aberrant GSTP1 promoter methylation exists in acute-on-chronic hepatitis B liver failure and shows high predictive value for short-term mortality. It might serve as a potential prognostic marker for acute-on-chronic hepatitis B liver failure.
Collapse
|
218
|
Wang Z, Hu X, Wan S, He J, Tang S, Wang B, Gao S, Yu F. Is it effective and safe to plus traditional Chinese medicine injection for patients in acute phase of stroke?–a meta analysis**. Clin Ther 2015. [DOI: 10.1016/j.clinthera.2015.05.223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
219
|
Gao S, Li H, Zhou XQ, You JB, Tu DN, Xia G, Jiang JX, Xin C. Withaferin A attenuates lipopolysaccharide-induced acute lung injury in neonatal rats. Cell Mol Biol (Noisy-le-grand) 2015; 61:102-106. [PMID: 26255139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2015] [Accepted: 07/05/2015] [Indexed: 06/04/2023]
Abstract
Withaferin A (WFA) is an active compound from Withania somnifera and has been reported to exhibit a variety of pharmacological activities such as anti—inflammatory, immunomodulatory and anti—tumor properties. In the present study, we investigated the potential protective role of WFA on acute lung injury in neonatal rats induced by lipopolysaccharide (LPS). We found that WFA significantly attenuated the pathological changes of lungs induced by LPS injection. Administration with WFA obviously decreased pulmonary neutrophil infiltration accompanied with decreased MPO concentrations. WFA also reduced the expression of pro—inflammatory cytokines including MIP—2, TNF—α, IL—1β and IL—6. Meanwhile, the expression levels of anti—inflammatory mediators such as TGF—β1 and IL—10 were significantly increased following WFA administration. Moreover, WFA protected LPS—treated rats from oxidative damage via up—regulation of TBARS and H2O2 concentrations and down—regulation of ROS contents. Taken together, the present study demonstrated that WFA administration attenuated LPS—induced lung injury through inhibition of inflammatory responses and oxidative stress.
Collapse
|
220
|
Gao S, Balter P, Wang X, Sadagopan R, Pollard J. SU-E-T-245: Detection of the Photon Target Damage in Varian Linac Based On Periodical Quality Assurance Measurements. Med Phys 2015. [DOI: 10.1118/1.4924607] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
221
|
Lewis D, Wang X, Gao S, Nitsch P, Pollard J, Sadagopan R, Balter P. SU-E-T-26: A Dosimetric Comparison of Two Treatment Setups for Lung Stereotactic Body Radiation Therapy (SBRT) Patients. Med Phys 2015. [DOI: 10.1118/1.4924387] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
222
|
Gao S, Balter P, Rose M, Simon W. SU-E-T-645: Qualification of a 2D Ionization Chamber Array for Beam Steering and Profile Measurement. Med Phys 2015. [DOI: 10.1118/1.4925008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
223
|
Zhang B, Gao S, Tao W. An epidemiological survey of cataract in China. DEVELOPMENTS IN OPHTHALMOLOGY 2015; 27:89-94. [PMID: 8969967 DOI: 10.1159/000425654] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
|
224
|
Coffin CS, Osiowy C, Gao S, Nishikawa S, van der Meer F, van Marle G. Hepatitis B virus (HBV) variants fluctuate in paired plasma and peripheral blood mononuclear cells among patient cohorts during different chronic hepatitis B (CHB) disease phases. J Viral Hepat 2015; 22:416-26. [PMID: 25203736 DOI: 10.1111/jvh.12308] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Hepatitis B virus is classically considered a hepatotropic virus but also infects peripheral blood mononuclear cells. Chronic hepatitis B has different disease phases modulated by host immunity. We compared HBV variability, drug resistance and immune escape mutations in the overlapping HBV polymerase/surface gene in plasma and peripheral blood mononuclear cells in different disease phases. Plasma and peripheral blood mononuclear cells were isolated from 22 treatment naïve patient cohorts (five inactive, six immune-active, nine HBeAg negative and two immune-tolerant). HBV was genotyped via line probe assay, hepatitis B surface antigen titres were determined by an in-house immunoassay, and HBV DNA was quantified by kinetic PCR. The HBV polymerase/surface region, including full genome in some, was PCR-amplified and cloned, and ~20 clones/sample were sequenced. The sequences were subjected to various mutational and phylogenetic analyses. Clonal sequencing showed that only three of 22 patients had identical HBV genotype profiles in both sites. In immune-active chronic hepatitis B, viral diversity in plasma was higher compared with peripheral blood mononuclear cells. Mutations at residues, in a minority of clones, associated with drug resistance, and/or immune escape were found in both compartments but were more common in plasma. Immune escape mutations were more often observed in the peripheral blood mononuclear cells of immune-active CHB carriers, compared with other disease phases. During all CHB disease phases, differences exist between HBV variants found in peripheral blood mononuclear cells and plasma. Moreover, these data indicate that HBV evolution occurs in a compartment and disease phase-specific fashion.
Collapse
|
225
|
Xue Y, Wang L, Xia D, Li Q, Gao S, Dong M, Cai T, Shi S, He L, Hu K, Mao T, Duan X. Dental Abnormalities Caused by Novel Compound Heterozygous CTSK Mutations. J Dent Res 2015; 94:674-81. [PMID: 25731711 DOI: 10.1177/0022034515573964] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Cathepsin K (CTSK) is an important protease responsible for degrading type I collagen, osteopontin, and other bone matrix proteins. The mutations in the CTSK gene can cause pycnodysostosis (OMIM 265800), a rare autosomal recessive bone dysplasia. Patients with pycnodysostosis have been reported to present specific dental abnormalities; however, whether these dental abnormalities are related to dysfunctional CTSK has never been reported. Here we investigated the histologic changes of cementum and alveolar bone in a pycnodysostosis patient, caused by novel compound heterozygous mutations in the CTSK gene (c.87 G>A p.W29X and c.848 A>G p.Y283C). The most impressive manifestations in tooth were extensive periradicular high-density clumps with unclear periodontal space by orthopantomography examination and micro-computed tomography scanning analysis. Hematoxylin/eosin and toluidine blue staining and atomic force microscopy analysis showed that the cementum became significantly thickened, softened, and full of cementocytes. The disorganized bone structure was the main character of alveolar bone. The p.W29X mutation may represent the loss-of-function allele with an earlier termination codon in the precursor CTSK polypeptide. Residue Y283 is highly conserved among papain-like cysteine proteases. Three-dimensional structure modeling analysis found that the loss of the hydroxybenzene residue in the Y283C mutation would interrupt the hydrogen network and possibly affect the self-cleavage of the CTSK enzyme. Furthermore, p.Y283C mutation did not affect the mRNA and protein levels of overexpressed CTSK in COS-7 system but did reduce CTSK enzyme activity. In conclusion, the histologic and ultrastructural changes of cementum and alveolar bone might be affected by CTSK mutation via reduction of its enzyme activity (clinical trial registration: ChiCTR-TNC-10000876).
Collapse
|