Abstract
Hyperglycemia with severe reduction of plasma insulin level is frequently associated with acute ischemic heart disease. Since insulin is reported to be an anti thrombotic humoral factor, the mechanism of the impaired insulin synthesis was investigated. The plasma from the patients with acute myocardial infarction (AMI) was analyzed by SDS-polyacrylamide gel electrophoresis. Dermcidin isoform 2 (dermcidin) was determined by enzyme linked immunosorbent assay. Insulin synthesis was determined by in vitro translation of glucose induced insulin mRNA synthesis in the pancreatic β cells. Nitric oxide (NO) was determined by methemoglobin method. SDS-polyacrylamide gel electrophoresis of AMI plasma demonstrated the presence of a novel protein band of Mr 11 kDa that was determined to be dermcidin. Addition of 0.1 μM dermcidin inhibited insulin synthesis by >65 fold compared to control through the inhibition of NO synthesis in the pancreatic cells. The oral administration of 150 mg acetyl salicylic acid (aspirin) to the AMI patients increased the plasma insulin level from 13 (median) to 143 μunits/dl (median) with concomitant decrease of plasma dermcidin level from 112 to 9 nM in these patients within 12 h. It was also found that while the injection of 3.0 ± 0.05 (n = 10) nmol dermcidin with 0.25 ± 0.03 μmol ADP/g body weight caused coronary thrombus in mice, ADP itself at this concentration failed to produce thrombus. These results indicated that dermcidin was a novel platelet aggregating agent, and potentiated the ADP induced thrombosis in the animal model as well as acutely inhibited glucose induced insulin synthesis.
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Miss Rajeshwary Ghosh is a PhD student and was supported by a fellowship provided by Sinha Institute of Medical Science and Technology.
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Ghosh, R., Karmohapatra, S.K., Bhattacharyya, M. et al. The appearance of dermcidin isoform 2, a novel platelet aggregating agent in the circulation in acute myocardial infarction that inhibits insulin synthesis and the restoration by acetyl salicylic acid of its effects. J Thromb Thrombolysis 31, 13–21 (2011). https://doi.org/10.1007/s11239-010-0515-z
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DOI: https://doi.org/10.1007/s11239-010-0515-z