title: Glucose-dependent insulinotropic polypeptide reduces fat-specific expression and activity of 11β-hydroxysteroid dehydrogenase type 1 and inhibits release of free fatty acids.
abstract: Glucose-dependent insulinotropic polypeptide (GIP) has been suggested to have direct effects on nonislet tissues. GIP also reportedly increased glucose uptake and inhibition of lipolysis in adipocytes after inhibition of the intracellular cortisone-cortisol shuttle 11β-hydroxysteroid dehydrogenase type 1 (11β-HSD1). We here analyzed whether GIP modifies lipid metabolism and further elucidated the relation between GIP, 11β-HSD1, and fatty acid metabolism. GIP reduced activity of 11β-HSD1 promoter constructs and the expression and activity of 11β-HSD1 in differentiated 3T3-L1 adipocytes in a time- and dose-dependent fashion. This was paralleled by a reduction of free fatty acid (FFA) release and a reduced expression of key enzymes regulating lipolysis in adipose tissue. Preinhibition of 11β-HSD1 completely abolished GIP-induced effects on FFA release. To investigate the acute effects of GIP in humans, a randomized clinical trial was performed. GIP lowered circulating FFAs compared with saline control and reduced expression and ex vivo activity of 11β-HSD1 and adipose triglyceride lipase expression in subcutaneous fat biopsies. Our data suggest that GIP reduces FFA release from adipose tissue by inhibition of lipolysis or by increased reesterification. This process appears to depend on a modification of 11β-HSD1 activity. In general, the presented data support that GIP has direct and insulin-independent effects on adipose tissue.
authors.affiliation: Charité-Universitätsmedizin Berlin, Campus Benjamin Franklin, Department of Endocrinology, Diabetes and Nutrition, Berlin, Germany.
authors.forename: Özlem
authors.initials: Ö
authors.lastname: Gögebakan
authors.forename: Janin
authors.initials: J
authors.lastname: Andres
authors.forename: Katrin
authors.initials: K
authors.lastname: Biedasek
authors.forename: Knut
authors.initials: K
authors.lastname: Mai
authors.forename: Peter
authors.initials: P
authors.lastname: Kühnen
authors.forename: Heiko
authors.initials: H
authors.lastname: Krude
authors.forename: Frank
authors.initials: F
authors.lastname: Isken
authors.forename: Natalia
authors.initials: N
authors.lastname: Rudovich
authors.forename: Martin A
authors.initials: MA
authors.lastname: Osterhoff
authors.forename: Ulrich
authors.initials: U
authors.lastname: Kintscher
authors.forename: Michael
authors.initials: M
authors.lastname: Nauck
authors.forename: Andreas F H
authors.initials: AF
authors.lastname: Pfeiffer
authors.forename: Joachim
authors.initials: J
authors.lastname: Spranger
mesh_terms: D043205:11-beta-Hydroxysteroid Dehydrogenase Type 1 / Q000235:genetics / Q000502:physiology*; D041721:3T3-L1 Cells; D000328:Adult; D000818:Animals; D002454:Cell Differentiation / Q000187:drug effects; D005230:Fatty Acids, Nonesterified / Q000097:blood / Q000378:metabolism*; D005749:Gastric Inhibitory Polypeptide / Q000494:pharmacology*; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects; D006801:Humans; D008049:Lipase / Q000235:genetics; D008297:Male; D051379:Mice; D008875:Middle Aged; D011401:Promoter Regions, Genetic; D012333:RNA, Messenger / Q000032:analysis; D002787:Sterol Esterase / Q000235:genetics; D000217:Acyltransferases
chemical_list: D043205:11-beta-Hydroxysteroid Dehydrogenase Type 1; D005230:Fatty Acids, Nonesterified; D005749:Gastric Inhibitory Polypeptide; D008049:Lipase; D012333:RNA, Messenger; D002787:Sterol Esterase; C494794:PNPLA2 protein, human; D000217:Acyltransferases