Summary
The biologic actions of vasoactive intestinal polypeptide (VIP) on insulin binding, glucose uptake and utilization, and on lipolysis were studied. At concentrations between 10−10 and 10−7 mol/l VIP influenced neither glucose uptake nor glucose incorporation into lipids under basal and insulin-stimulated conditions. This effect was independent of the presence of adenosine deaminase in the incubation medium. At 10−8 mol/l VIP increased insulin binding affinity slightly but not significantly, shifting the ID-50 from 12.4 ng/ml to 10.3 ng/ml, without any change in receptor number. However, VIP showed a marked dose-dependent lipolytic activity with the lowest effective concentration at 10−9 mol/l. At 10−6 mol/l glycerol release increased 7.3-fold as compared to basal lipolysis. In conclusion, VIP did not affect adipose tissue metabolism at physiologic concentrations. In the rare Verner-Morrison syndrome, however, the potent lipolytic activity of VIP may contribute to the metabolic disturbances observed.
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Hauner, H., Glatting, G., Kaminska, D. et al. Effect of vasoactive intestinal polypeptide (VIP) on glucose and lipid metabolism of isolated rat adipocytes. Res. Exp. Med. 188, 189–195 (1988). https://doi.org/10.1007/BF01852320
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DOI: https://doi.org/10.1007/BF01852320