C-Peptide

C-peptide is produced by the beta cells of the pancreas as part of the proinsulin molecule (insulin precursor). It initially connects (C-connecting) the A and B chains of proinsulin and is released when proinsulin is further processed into insulin. Originating from the same molecule, C-peptide and insulin are released into the blood stream in equal amounts. The half life of C-peptide (~30min) in blood is approximately 5 times that of insulin, which accounts for C-peptide levels occurring in greater amounts than insulin in sera. C-peptide is increased in type II diabetes and insulin resistance, in contrast to decreasing in type I diabetes. High levels of C-peptide levels can occur in insulin producing tumors.

Swiss-Prot Accession Number: P01308


Myriad RBM Publications Publications
Metabolomic analyses reveal lipid abnormalities and hepatic dysfunction in non-human primate model for Yersinia pestis (2019) Gautam A, Muhie S, Cakraborty N, Hoke A, Donohue D, Miller SA, Hammamieh R, Jett M Metabolomics
Increased serum levels of leptin and insulin in both schizophrenia and major depressive disorder: A cross-disorder proteomics analysis (2019) Cakici N, Bot M, Lamers F, Janssen T, van der Haan L, Bahn S, Penninx BWJH, van Beveren NJM European Neuropsychopharmacology
Dendritic cell immunotherapy followed by cART interruption during HIV-1 infection induces plasma protein markers of cellular immunity and neutrophil recruitment (2018) van den Ham HJ, Cooper J, Tomasik J, Bahn S, Aerts J, Oseterhaus A, Gruters R, Andeweg A PLoS One
Proteomic biomarkers of cognitive impairment in obstructive sleep apnea syndrome (2018) Lal C, Hardiman G, Kumbhare S, Strange C Sleep and Breathing
The association of basal insulin treatment versus standard care with outcomes in anti-GAD positive and -negative subjects. A post-hoc analysis of the ORIGIN-trial (2018) Birkeland KI, Grill V, Wium C, McQueen MJ, Lopez-Jaramillo P, Lee SF, Gerstein HC Diabetes, Obesity and Metabolism
Variation in Serum Biomarkers with Sex and Female Hormonal Status: Implications for Clinical Tests (2016) Ramsey JM, Cooper JD, Penninx BWJH, Bahn S Scientific Reports
A Semi-Mechanism Approach Based on Mri and Proteomics for Prediction of Conversion from Mild Cognitive Impairment to Alzheimer’s Disease (2016) Liu H, Zhou X, Jiang H, He H, Liu X Scientific Reports
Evidence for disturbed insulin and growth hormone signaling as potential risk factors in the development of schizophrenia. (2014) van Beveren NJ, Schwarz E, Noll R, Guest PC, Meijer C, de Haan L, Bahn S. Translational Psychiatry 2014 Aug 26;4:e430. doi: 10.1038/tp.2014.52.
Multiplex immunoassay analysis of plasma shows prominent upregulation of growth factor activity pathways linked to GSK3ß signaling in bipolar patients (2013) Haenisch F, Alsaif M, Guest PC, Rahmoune H, Dickerson F, Yolken R, Bahn S Journal of Affective Disorders
Plasma biomarkers of depressive symptoms in older adults (2012) Arnold SE, Xie SX, Leung YY, Wang LS, Kling MA, Han X, Kim EJ, Wolk DA, Bennett DA, Chen-Plotkin A, Grossman M, Hu W, Lee VMY, Mackin RS, Trojanowski JQ, Wilson RS, Shaw LM Translational Psychiatry (2012) 2, e65;
Plasma Based Markers of [(11)C] PiB-PET Brain Amyloid Burden (2012) Kiddle SJ, Thambisetty M, Simmons A, Riddoch-Contreras J, Hye A, Westman E, Pike I, Ward M, Johnston C, Lupton MK, Lunnon K, Soininen H, Kloszewska I, Tsolaki M, Vellas B, Mecocci P, Lovestone S, Newhouse S, Dobson R; for the Alzheimers Disease Neuroimaging Initiative PLoS One. 2012;7(9):e44260.