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C-Peptide (U-type) Rat ELISA

  • Regulatory status:RUO
  • Type:Sandwich ELISA, Biotin-labelled antibody
  • Species:Rat
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RSHAKRCP030R 96 wells (1 kit)
PubMed Product Details
Technical Data

Type

Sandwich ELISA, Biotin-labelled antibody

Applications

Serum, Plasma-EDTA, Plasma-Heparin, Plasma-Citrate, Cell culture medium

Sample Requirements

10 µl/well

Storage/Expiration

Store the complete kit at 2–8°C. Under these conditions, the kit is stable until the expiration date (see label on the box).

Calibration Curve

Calibration Range

30–3 000 pg/ml

Limit of Detection

1.5 pg/ml

Summary

Research topic

Animal studies, Diabetology - Insulin, C-Peptide, Proinsulin

Summary

Insulin is first synthesized as a single chain polypeptide, proinsulin, then three disulfide bonds are formed, and finally divided into insulin and C-peptide through enzymatic splitting. Rat C-peptide 1 and 2 are both single chain peptides composed of 31 amino acids. Their homology is 93.5%. C-peptide is secreted together with insulin. The role of C-peptide has been considered to keep the best configuration to form three disulfide bonds, and has no biological activity, however, recent studies revealed that C-peptide can bind, probably, a G-protein-coupling specific receptor present on the surface of endothelial cells, kidney microtubule cells and fibroblasts, resulting in activation of calcium-dependent intracellular signaling, activation of Na+- K+-ATPase, and enhancement of NO synthesis. Administration of C-peptide to DM1 patients enhances blood circulation in the skeletal muscle and skin, and also minimizes kidney glomerular hyperfiltration, decreasing albumin excretion into urine, and also improves nervous function, indicating that C-peptide should be given together with insulin to DM1 patients. Important region to bind receptor has been reported to be C-terminal pentapeptide (27-31).

The biological half life of C-peptide is several times longer than that of insulin. Measurement of C-peptide is useful in estimation of pancreatic function for insulin synthesis and secretion. Urinary C-peptide concentration is well correlated to its blood level. C-peptide measurement is also useful in estimation of insulin secretion by cultured islet of Langerhans because very often insulin is added to the culture medium, and it is difficult to discriminate secreted insulin from added insulin. As Shibayagi’s kit recognizes the common sequences between C-peptide 1 and 2, it can measure total amount of C-peptide.

References to Product

References

  • Gayen JR, Saberi M, Schenk S, Biswas N, Vaingankar SM, Cheung WW, Najjar SM, O'Connor DT, Bandyopadhyay G, Mahata SK. A novel pathway of insulin sensitivity in chromogranin A null mice: a crucial role for pancreastatin in glucose homeostasis. J Biol Chem. 2009 Oct 16;284 (42):28498-509
References to Summary

References to C-Peptide

  • Beischer W, Heinze E, Keller L, Raptis S, Kerner W, Pfeiffer EF. Human C-peptide. Part II: Clinical studies. Klin Wochenschr. 1976 Aug 1;54 (15):717-25
  • Beischer W, Keller L, Maas M, Scherfer E, Pfeiffer EF. Human C-peptide. Part I: Radioimmunoassay. Klin Wochenschr. 1976 Aug 1;54 (15):709-15
  • Blix PM, Boddie-Willis C, Landau RL, Rochman H, Rubenstein AH. Urinary C-peptide: an indicator of beta-cell secretion under different metabolic conditions. J Clin Endocrinol Metab. 1982 Mar;54 (3):574-80
  • Bonser AM, Garcia-Webb P. C-peptide measurement: methods and clinical utility. Crit Rev Clin Lab Sci. 1984;19 (4):297-352
  • Conget I, Gonzalez-Clemente JM, Casals E, Casamitjana R, Gomis R, Malaisse WJ. Effect of hyperlipacidemia on plasma C-peptide concentration during euglycemic hyperinsulinemic clamp. Diabetes Res. 1993;22 (1):41-8
  • Horwitz DL, Starr JI, Mako ME, Blackard WG, Rubenstein AH. Proinsulin, insulin, and C-peptide concentrations in human portal and peripheral blood. J Clin Invest. 1975 Jun;55 (6):1278-83
  • Krew MA, Kehl RJ, Thomas A, Catalano PM. Relation of amniotic fluid C-peptide levels to neonatal body composition. Obstet Gynecol. 1994 Jul;84 (1):96-100
  • Rendell M. C-peptide levels as a criterion in treatment of maturity-onset diabetes. J Clin Endocrinol Metab. 1983 Dec;57 (6):1198-206
  • Rubenstein AH, Steiner DF, Horwitz DL, Mako ME, Block MB, Starr JI, Kuzuya H, Melani F. Clinical significance of circulating proinsulin and C-peptide. Recent Prog Horm Res. 1976;33:435-75
  • Tropeano G, Lucisano A, Liberale I, Barini A, Vuolo IP, Martino G, Menini E, Dell'Acqua S. Insulin, C-peptide, androgens, and beta-endorphin response to oral glucose in patients with polycystic ovary syndrome. J Clin Endocrinol Metab. 1994 Feb;78 (2):305-9
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