title: Bezafibrate regulates the expression and enzyme activity of 11beta-hydroxysteroid dehydrogenase type 1 in murine adipose tissue and 3T3-L1 adipocytes.
abstract: A clinically employed antihyperlipidemic drug, bezafibrate, has been characterized as a PPAR(alpha, -gamma, and -delta) pan-agonist in vitro. Recent extended trials have highlighted its antidiabetic properties in humans. However, the underlying molecular mechanism is not fully elucidated. The present study was designed to explore potential regulatory mechanisms of intracellular glucocorticoid reactivating enzyme, 11beta-HSD1 and anti-diabetic hormone, adiponectin by bezafibrate in murine adipose tissue, and cultured adipocytes. Treatment of db/db mice with bezafibrate significantly ameliorated hyperglycemia and insulin resistance, accompanied by a marked reduction of triglyceride and nonesterified fatty acids. Despite equipotent in lipid-lowering effects, another fibrate, fenofibrate, did not show such beneficial effects on glycemic control. Treatment of bezafibrate caused a marked decrease in the mRNA level of 11beta-HSD1 preferentially in adipose tissue of db/db mice (-47%, P<0.05), concomitant with a significant increase in plasma adiponectin level (+37%, P<0.01). Notably, treatment of bezafibrate caused a marked decrease in the mRNA level (-34%, P<0.01) and enzyme activity (-32%, P<0.01) of 11beta-HSD1, whereas the treatment substantially augmented the expression (+71%, P<0.01) and secretion (+27%, P<0.01) of adiponectin in 3T3-L1 adipocytes. Knockdown of 11beta-HSD1 by siRNA confirmed that 11beta-HSD1 acts as a distinct oxoreductase in adipocytes and validated the enzyme activity assays in the present study. Effects of bezafibrate on regulation of 11beta-HSD1 and adiponectin in murine adipocytes were comparable with those in thiazolidinediones. This is the first demonstration that bezafibrate directly regulates 11beta-HSD1 and adiponectin in murine adipocytes, both of which may contribute to metabolically-beneficial effects by bezafibrate.
authors.affiliation: Pharmacology Research Laboratory R and D, Kissei Pharmaceutica, Nagano, Japan.
authors.forename: Shigeru
authors.initials: S
authors.lastname: Nakano
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Inada
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Masuzaki
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Tanaka
authors.forename: Shintaro
authors.initials: S
authors.lastname: Yasue
authors.forename: Takako
authors.initials: T
authors.lastname: Ishii
authors.forename: Naoki
authors.initials: N
authors.lastname: Arai
authors.forename: Ken
authors.initials: K
authors.lastname: Ebihara
authors.forename: Kiminori
authors.initials: K
authors.lastname: Hosoda
authors.forename: Kazuyasu
authors.initials: K
authors.lastname: Maruyama
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Yamazaki
authors.forename: Nobuo
authors.initials: N
authors.lastname: Shibata
authors.forename: Kazuwa
authors.initials: K
authors.lastname: Nakao
mesh_terms: D043205:11-beta-Hydroxysteroid Dehydrogenase Type 1 / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D041721:3T3-L1 Cells; D017667:Adipocytes / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism*; D052242:Adiponectin / Q000097:blood / Q000378:metabolism*; D000273:Adipose Tissue / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism*; D000818:Animals; D001629:Bezafibrate / Q000494:pharmacology*; D048909:Diabetes Complications / Q000503:physiopathology; D003920:Diabetes Mellitus / Q000235:genetics / Q000378:metabolism* / Q000473:pathology / Q000503:physiopathology; D005230:Fatty Acids, Nonesterified / Q000097:blood; D006943:Hyperglycemia / Q000209:etiology / Q000503:physiopathology; D000960:Hypolipidemic Agents / Q000494:pharmacology*; D007333:Insulin Resistance; D008099:Liver / Q000473:pathology; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D009929:Organ Size / Q000187:drug effects; D010088:Oxidoreductases / Q000378:metabolism; D047492:Peroxisome Proliferator-Activated Receptors / Q000819:agonists; D012333:RNA, Messenger / Q000037:antagonists & inhibitors; D034741:RNA, Small Interfering / Q000494:pharmacology; D014280:Triglycerides / Q000097:blood
chemical_list: D052242:Adiponectin; D005230:Fatty Acids, Nonesterified; D000960:Hypolipidemic Agents; D047492:Peroxisome Proliferator-Activated Receptors; D012333:RNA, Messenger; D034741:RNA, Small Interfering; D014280:Triglycerides; D010088:Oxidoreductases; D043205:11-beta-Hydroxysteroid Dehydrogenase Type 1; D001629:Bezafibrate