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Experimental Diabetes Research
Volume 2008, Article ID 281536, 5 pages
http://dx.doi.org/10.1155/2008/281536
Review Article

C-Peptide Effects on Renal Physiology and Diabetes

UPRES EA 21-93, Laboratoire de Diabétologie, Faculté de Médecine de Marseille, Université de la Méditerranée, 13385 Marseille Cedex 05, France

Received 1 November 2007; Accepted 10 April 2008

Academic Editor: Thomas Forst

Copyright © 2008 L. Rebsomen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The C-peptide of proinsulin is important for the biosynthesis of insulin and has for a long time been considered to be biologically inert. Animal studies have shown that some of the renal effects of the C-peptide may in part be explained by its ability to stimulate the Na,K-ATPase activity. Precisely, the C-peptide reduces diabetes-induced glomerular hyperfiltration both in animals and humans, therefore, resulting in regression of fibrosis. The tubular function is also concerned as diabetic animals supplemented with C-peptide exhibit better renal function resulting in reduced urinary sodium waste and protein excretion together with the reduction of the diabetes-induced glomerular hyperfiltration. The tubular effectors of C-peptide were considered to be tubule transporters, but recent studies have shown that biochemical pathways involving cellular kinases and inflammatory pathways may also be important. The matter theory concerning the C-peptide effects is a metabolic one involving the effects of the C-peptide on lipidic metabolic status.This review concentrates on the most convincing data which indicate that the C-peptide is a biologically active hormone for renal physiology.