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Diabetes Specialists Call For Drug Regulators To Step In To Clarify Lantus Concerns, UK
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Microproteinuria: Indicator To Monitor CNI-Related Nephrotoxicity In Liver Transplant Recipients?

Deterioration of renal function with CNI therapy has been widely reported in liver transplant recipients. Microproteinuria has been used to monitor the early changes of nephropathy in renal disease or cardiovascular events. However, whether microproteinuria could be used as an early and sensitive indicator to monitor CNI-related nephrotoxicity in liver transplant recipients has not been unequivocally addressed. A research article published in the World Journal of Gastroenterology addresses this question. The research team led by Professor Yan from West China Hospital of Sichuan University studied the use of microproteinuria in early diagnosis of CNI-related nephrotoxicity after liver transplantation. Measurements of microproteinuria including 1-microglobulin (1m), 2-microglobulin (2m), immunoglobulin, microalbumin and transferrin were performed with a Dade Behring array nephelometry system. Follow-up data of this study demonstrated that there was a downward trend in renal function over time, with the persistence of microproteinuria. The urinary concentration of 2m and 1m significantly increased with the subtle changes in renal function in the study groups, but the levels of SCr and BUN significantly increased only when renal function was severely damaged by CNI nephrotoxicity. The subsequent reductions in GFR were closely correlated with the increases in ΁1m and 2m. Fewer patients were found to have 2m in the urine than 1m in this study as 2m is unstable in fresh urine. This problem can partly be overcome by maintaining the urine pH value (by adding basic buffer to the urine) to prevent the degradation of 2m. This study suggested that urinary 2m and ΁1m are sensitive urinary markers for detecting CNI-related nephrotoxicity in liver transplant recipients. The results are interesting and may represent a screening method to prevent the progression of CNI-related subclinical renal dysfunction after liver transplantation. Reference: Li J, Liu B, Yan LN, Wang LL, Lau WY, Li B, Wang WT, Xu Q, Yang JY, Li FG. Microproteinuria for detecting calcineurin nhibitor-related nephrotoxicity after liver transplantation. World J Gastroenterol 2009; 15(23): 2913-2917 http://www.wjgnet.com/1007-9327/15/2913.asp Correspondence to: Lu-Nan Yan, Division of Liver ransplantation, West China Hospital, Sichuan University, hengdu 610041, China. Lin Tian World Journal of Gastroenterology


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