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

Euglycemic hyperinsulinemia, but not lipid infusion, decreases circulating ghrelin levels in humans.

J. Endocrinol. Invest. 25, RC36-8 (2002)

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The orexigenic and anabolic gastric hormone ghrelin is secreted in response to acute and chronic energy requirements. While pre-prandial increases and post-prandial decreases of plasma ghrelin levels in rodents and humans seem to indicate a role for the novel peptide hormone as an afferent meal initiator or "hunger hormone", the precise mechanisms which are suppressing ghrelin secretion in response to caloric intake remain largely unknown. We show here that human ghrelin levels decrease by almost 50% under hyperinsulinemic euglycemic clamp conditions (no.=4, p=0.001), revealing physiologically relevant increases of insulin levels as an independent determinant of circulating ghrelin levels. In a second study, 3-4-fold increased plasma free fatty acid levels, as another metabolic candidate for the modulation of circulating ghrelin concentrations, were generated by constant lipid infusion, but failed to change plasma ghrelin. Simultaneous elevation of free fatty acids and insulin again markedly decreased ghrelin concentration (no.=4, p=0.01). Insulin induced suppression of circulating ghrelin levels (or the lack thereof) could be a mechanism with relevance for the understanding of the (patho-) physiology of meal initiation and termination, the pathogenesis of the metabolic syndrome and for the development of respective therapeutic perspectives.

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