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Objective To investigate if Rac1 GTPase activation plays an important role in hyperpermeability and tyresine phosphorylation of tight junction induced by vascular endothelial growth factor (VEGF) in glomertdar endothelial cells (GEnCs). Methods Primary cultured rat endothelial cells were used as experimental model. The effect of VEGF at different concentrations (5 or 50 μg/L) on endothelial permeability was investigated by transendothelial electrical resistance (TEER). The permeability of GEnCs transfected with wild type Rac1 (wtRacl) or dominant negative Racl (N17Rac1) was also detected. Immune precipitation and immune blotting were used to detect the tyrosine phosphor-occludin in GEnCs. Results VEGF at high concentration (50 μg/L) induced hyperpermeability in GEnCs (P<0.05). At the same time, GTP-binding and membrane-bound Racl GTPase significantly increased(P<0.01)in GEnCs. Tyrosine phosphor-occludin was also increased (P<0.05) under VEGF stimulation. However, transfection of GEnCs with N17Rac1 dramatically attenuated the effect of VEGF on tyrosine phospho-occludin and endothelial cell permeability. Conclusions Increased VEGF can induce hyperpermeability in glomerular endothelial cells, which is related to occludin tyrosine phosphorylation through Racl activation. It provides a framework for understanding the role of VEGF-induced Racl-phospho-occludin pathway in the integrity of barrier function in the diabetic milieu.
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Objective To present the baseline characteristics of serum uric acid level in patients with chronic kidney disease(CKD)in single.centre nephrology clinic and judge the risk factor for decreased renal function of CKD Datients.Methods A cross-sectional study on CKD patients in clinic was carried out for 9 months.Results 780 CKD cases were enrolled in the study.The top four causes of CKD in these patients were primary glomerular disease(59.0%),essential hypertension(7.6%),lupus nephritis(6.4%)and diabetic nephropathy(6.3%).The average age was 41.9.The distribution of CKD stage was 47.8%of CKD1,18.7%of CKD2,14.0%of CKD3,8.1% of CKD4 and 11.4%of CKD5.Multivariate Logistic regression regression analysis indicated that age,proteinuria,hypertension were independently correlated with decreased renal function.Conclusion This is the largest cross-sectional study of CKD in China,which will help to determine the basic status of Chinese CKD patients,laying a basis for further followup.
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Objective To present the baseline characteristics of serum uric acid level in patients with chro-nic kidney disease(CKD). Methods A cross-sectional study on CKD patients was carried out in our hospital for 9 months. Results 713 patients were enrolled. The top three causes of CKD in these patients were primary glomerular disease(61.2%, 436/713), essential hypertensive kidney disease (7. 2%, 51/713 ) and diabetic nephropathy (5.8% ,41/713). Serum uric acid level and the incidence of hyperuricemia were associated with the stage of CKD (F = 73. 569, P = 0. 000;χ2= 138. 156, P = 0.000). A significantly negative correlation was discovered between ser-um uric acid level and the level of glomerular filtration rate(RR = - 1. 045 ,P =0. 000). A significantly positive cor-relation of serum uric acid level was found with diastohc blood pressure, proteinuia level, smoking and BMI ( RR = 1.400,15. 149,37. 696,and 3.421 ,P <0.05 ,respectively). Conclusions The cross-sectional study of serum uric acid level in patients with CKD will help to determine the dynamic changes of serum uric acid level in Chinese CKD patients and lay a solid basis for the prevention and treatment of CKD and its complications.
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Objective To investigate the serum leptin levels of chronic hemodialysis patients and its relation to their nutritional status.Methods Twenty-nine maintenance hemodialysis patients were included in the study.TSF(triceps skin fold),BMI(body mass index) and FAT%(content of fat),lymphocyte count,serum albumin,globulin,total iron binding capacity,BUN,creatinine,cholesterol,triglyceride and leptin were measured.Malnutrition-inflammation score(MIS) was used to assess the patients nutritinal status.Results Levels of leptin were positively correlated with BMI,FAT%,TSF and MIS(P