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  • Title: NSILA-carrier protein abolishes the action of nonsuppressible insulin-like activity (NSILA-S) on perfused rat heart.
    Author: Meuli C, Zapf J, Froesch ER.
    Journal: Diabetologia; 1978 Apr; 14(4):255-9. PubMed ID: 640301.
    Abstract:
    Human serum in a concentration of 10% in the perfusion medium failed to increase glucose uptake by the isolated perfused rat heart, indicating that nonsuppressible insulin-like activity (NSILA) in whole serum was inactive in this system. When NSILA-carrier protein was added to partially purified NSILA-S, its biological activity on the rat heart disappeared. In contrast, the action of insulin was not affected by the presence of NSILA-carrier protein. Binding of 125I-labelled NSILA-S to rat heart was inhibited by NSILA-carrier protein. 125I-labelled insulin binding was not inhibited. These results support the hypothesis that NSILA-S bound to serum carrier protein is a large molecular compound which does not readily diffuse out of the capillary bed and therefore does not exert insulin-like effects in vivo.
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