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Spranger, J.* ; Ristow, M.* ; Otto, B.* ; Heldwein, W.* ; Tschöp, M.H. ; Pfeiffer, A.F.* ; Möhlig, M.*

Post-prandial decrease of human plasma ghrelin in the absence of insulin.

J. Endocrinol. Invest. 26, RC19-22 (2003)

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Ghrelin is the most powerful orexigenic hormone in mammalian physiology. Ghrelin plasma concentrations increase prior to meal onset, but decrease post-prandially. We and others reported previously that insulin reduces circulating ghrelin levels and might therefore be a driving force for post-prandial suppression of ghrelin. To test the influence of insulin on post-prandial ghrelin regulation, a patient with Type I diabetes with complete insulin deficiency received a low glycemic index meal and subsequently an additional high glycemic index meal in the absence of insulin substitution. Subsequently, a sc injection of 0.08 IU Lispro insulin per kg body weight was given. Results were compared to those of a healthy control subject matched for sex, age and body mass index, which was undergoing the same test series (without Lispro bolus) in the presence of endogenous post-prandial insulin secretion. A substantial decrease of plasma ghrelin levels was observed in the insulin-deficient patient following low glycemic index carbohydrate load (27% plasma ghrelin decrease). The subsequent exposure to a high glycemic index meal resulted in a slight additional reduction of ghrelin levels (32% from baseline), while Lispro bolus did not induce further changes in circulating ghrelin (27% of baseline at termination). This post-prandial response was comparable to that of the healthy control subject (33% reduction after the first meal, 40% after the second meal). These data tentatively suggest that post-prandial secretion of ghrelin is not exclusively regulated by plasma insulin or plasma glucose but may depend on other metabolic factors yet to be identified.

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