title: Abnormalities of erythrocyte deformability and platelet aggregation in insulin-dependent diabetics corrected by insulin in vivo and in vitro.
abstract: Erythrocyte deformability is lower than normal in uncontrolled insulin-dependent diabetics and returns towards normal after 24 h treatment with a feedback-controlled insulin infusion. Deformability of normal erythrocytes is reduced by incubation in plasma from uncontrolled insulin-dependent diabetics but is normal in plasma from insulin-dependent diabetics controlled by 24 h insulin infusion, or in plasma from uncontrolled insulin-dependent diabetics with insulin added in vitro. Therefore, insulin has a direct action on erythrocyte deformability. Platelet aggregation measured in whole blood is raised in uncontrolled insulin-dependent diabetics and returns to normal after 24 h treatment with a feedback-controlled insulin infusion. Aggregation of normal platelets rises in the presence of erythrocytes from uncontrolled insulin-dependent diabetics, but not erythrocytes from the same patients after 24 h treatment with insulin. The effect of insulin on platelet aggregation therefore seems to be at least partly mediated by erythrocytes. The enhanced platelet aggregation seen in uncontrolled insulin-dependent diabetics can be explained either by a direct effect of erythrocyte rigidity or by an increased release of nucleotides (ADP) by the erythrocytes.
mesh_terms: D003920:Diabetes Mellitus / Q000097:blood* / Q000188:drug therapy; D004912:Erythrocytes / Q000187:drug effects*; D005260:Female; D006801:Humans; D007328:Insulin / Q000494:pharmacology* / Q000627:therapeutic use; D008297:Male; D010974:Platelet Aggregation / Q000187:drug effects*
chemical_list: D007328:Insulin