TY - JOUR
T1 - The Gluco- and Liporegulatory and Vasodilatory Effects of Glucose-Dependent Insulinotropic Polypeptide (GIP) Are Abolished by an Antagonist of the Human GIP Receptor
AU - Asmar, Meena
AU - Asmar, Ali
AU - Simonsen, Lene
AU - Gasbjerg, Lærke Smidt
AU - Sparre-Ulrich, Alexander Hovard
AU - Rosenkilde, Mette Marie
AU - Hartmann, Bolette
AU - Dela, Flemming
AU - Holst, Jens Juul
AU - Bülow, Jens
N1 - © 2017 by the American Diabetes Association.
PY - 2017/9
Y1 - 2017/9
N2 - A truncated form of human glucose-dependent insulinotropic polypeptide (GIP), GIP(3-30)NH2, was recently identified as an antagonist of the human GIP receptor. This study examined the ability of GIP(3-30)NH2 to antagonize the physiological actions of GIP in glucose metabolism, subcutaneous abdominal adipose tissue blood flow (ATBF), and lipid metabolism in humans. Eight lean subjects were studied by measuring arteriovenous concentrations of metabolites and ATBF on three different occasions during hyperglycemic-hyperinsulinemic clamps with concomitant infusions of GIP, GIP(3-30)NH2, or both GIP and GIP(3-30)NH2 During infusion of GIP(3-30)NH2 alone and in combination with GIP, insulin levels and the total glucose amount infused to maintain the clamp were lower than during GIP alone. In addition, ATBF remained constant during the antagonist and increased only slightly in combination with GIP, whereas it increased fivefold during GIP alone. Adipose tissue triacylglyceride (TAG) and glucose uptake decreased, and the free fatty acid/glycerol ratio increased during the antagonist alone and in combination with GIP. The changes in glucose infusion rates and plasma insulin levels demonstrate an inhibitory effect of the antagonist on the incretin effect of GIP. In addition, the antagonist inhibited GIP-induced increase in ATBF and decreased the adipose tissue TAG uptake, indicating that GIP also plays a crucial role in lipid metabolism.
AB - A truncated form of human glucose-dependent insulinotropic polypeptide (GIP), GIP(3-30)NH2, was recently identified as an antagonist of the human GIP receptor. This study examined the ability of GIP(3-30)NH2 to antagonize the physiological actions of GIP in glucose metabolism, subcutaneous abdominal adipose tissue blood flow (ATBF), and lipid metabolism in humans. Eight lean subjects were studied by measuring arteriovenous concentrations of metabolites and ATBF on three different occasions during hyperglycemic-hyperinsulinemic clamps with concomitant infusions of GIP, GIP(3-30)NH2, or both GIP and GIP(3-30)NH2 During infusion of GIP(3-30)NH2 alone and in combination with GIP, insulin levels and the total glucose amount infused to maintain the clamp were lower than during GIP alone. In addition, ATBF remained constant during the antagonist and increased only slightly in combination with GIP, whereas it increased fivefold during GIP alone. Adipose tissue triacylglyceride (TAG) and glucose uptake decreased, and the free fatty acid/glycerol ratio increased during the antagonist alone and in combination with GIP. The changes in glucose infusion rates and plasma insulin levels demonstrate an inhibitory effect of the antagonist on the incretin effect of GIP. In addition, the antagonist inhibited GIP-induced increase in ATBF and decreased the adipose tissue TAG uptake, indicating that GIP also plays a crucial role in lipid metabolism.
KW - Journal Article
U2 - 10.2337/db17-0480
DO - 10.2337/db17-0480
M3 - Journal article
C2 - 28667118
SN - 0012-1797
VL - 66
SP - 2363
EP - 2371
JO - Diabetes
JF - Diabetes
IS - 9
ER -