Article ; Online: Synergistic effects of C-peptide and insulin on low O2-induced ATP release from human erythrocytes.
American journal of physiology. Regulatory, integrative and comparative physiology
2013 Volume 305, Issue 11, Page(s) R1331–6
Abstract: Erythrocytes participate in the matching of oxygen (O2) delivery with local need in skeletal muscle via the release of O2 and the vasodilator, ATP. It was reported that a concentration of insulin found in humans with insulin resistance inhibits low O2- ... ...
| Abstract | Erythrocytes participate in the matching of oxygen (O2) delivery with local need in skeletal muscle via the release of O2 and the vasodilator, ATP. It was reported that a concentration of insulin found in humans with insulin resistance inhibits low O2-induced ATP release. However, in vivo, insulin is coreleased with connecting peptide (C-peptide) at equimolar concentrations, but because of the shorter insulin half-life, the peptides circulate at ratios of C-peptide to insulin ranging from 1:1 to 6:1. Here, we investigate the hypothesis that C-peptide and insulin work synergistically to maintain low O2-induced ATP release from human erythrocytes. Using a thin-film tonometer to alter O2 tension, we determined that either C-peptide or insulin alone inhibits low O2-induced ATP release in a concentration-dependent manner; however, coadministration of the peptides at a 1:1 ratio does not (n = 5; P < 0.05). Because this ratio of C-peptide to insulin is not present in vivo for extended periods, we also investigated the effect of additional physiological ratios on ATP release. In the presence of insulin concentrations that would be found in fasting humans (0.05 nM), C-peptide to insulin ratios of 4:1 and 6:1 did not adversely affect low O2-induced ATP release. However, at a concentration of insulin found in the peripheral circulation of humans under postprandial conditions (0.5 nM), a ratio of C-peptide to insulin of 6:1 inhibited low O2-induced ATP release (n = 5). These findings demonstrate a heretofore unrecognized synergism between C-peptide and insulin that could have physiological importance in the regulation of perfusion distribution in skeletal muscle. |
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| MeSH term(s) | Adenosine Triphosphate/metabolism ; Adult ; Aged ; C-Peptide/pharmacology ; Cyclic AMP/blood ; Drug Synergism ; Erythrocytes/drug effects ; Erythrocytes/metabolism ; Female ; Humans ; Insulin/pharmacology ; Male ; Middle Aged ; Muscle, Skeletal/metabolism ; Oxygen/metabolism ; Young Adult |
| Chemical Substances | C-Peptide ; Insulin ; Adenosine Triphosphate (8L70Q75FXE) ; Cyclic AMP (E0399OZS9N) ; Oxygen (S88TT14065) |
| Language | English |
| Publishing date | 2013-10-02 |
| Publishing country | United States |
| Document type | Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't |
| ZDB-ID | 603839-6 |
| ISSN | 1522-1490 ; 0363-6119 |
| ISSN (online) | 1522-1490 |
| ISSN | 0363-6119 |
| DOI | 10.1152/ajpregu.00341.2013 |
| Database | MEDical Literature Analysis and Retrieval System OnLINE |
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