Transgenic Overexpression of Leptin Rescues Insulin Resistance and Diabetes in a Mouse Model of Lipoatrophic Diabetes

• Published in: Diabetes (New York, N.Y.) Vol. 50; no. 6; pp. 1440 - 1448
• Main Authors: Ebihara, Ken, Ogawa, Yoshihiro, Masuzaki, Hiroaki, Shintani, Mitsuyo, Miyanaga, Fumiko, Aizawa-Abe, Megumi, Hayashi, Tatsuya, Hosoda, Kiminori, Inoue, Gen, Yoshimasa, Yasunao, Gavrilova, Oksana, Reitman, Marc L., Nakao, Kazuwa
• Format: Journal Article
• Language: English
• Published: Alexandria, VA American Diabetes Association 01.06.2001
• Subjects: Adipocytes; Adipose tissue; Adipose tissues; Animals; Antidiabetics; Biological and medical sciences; Blood Glucose - analysis; Body fat; Body Weight - drug effects; Diabetes; Diabetes Mellitus, Lipoatrophic - drug therapy; Diabetes Mellitus, Lipoatrophic - pathology; Diabetes Mellitus, Lipoatrophic - physiopathology; Diabetes research; Diabetes. Impaired glucose tolerance; Eating; Endocrine pancreas. Apud cells (diseases); Endocrinopathies; Etiopathogenesis. Screening. Investigations. Target tissue resistance; Fatty acids; Food; Gene Expression; Genetically modified mice; Glucose; Infusion Pumps; Injections; Insulin; Insulin Resistance; Leptin; Leptin - administration & dosage; Leptin - blood; Leptin - genetics; Leptin - therapeutic use; Lipids - blood; Medical sciences; Metabolism; Mice; Mice, Inbred Strains; Mice, Transgenic - genetics; Organ Size; Physiological aspects; Plasma; Transgenes - genetics; Transgenic animals; Variance analysis; Japan; Endocrinopathy; Animal model; Pancreatic hormone; Rodentia; Transgenic animal; Gene overexpression; Lipoatrophic diabetes; Insulin; Target tissue resistance; Vertebrata; Mammalia; Mouse; Leptin
• ISSN: 0012-1797; 1939-327X
• DOI: 10.2337/diabetes.50.6.1440

Transgenic Overexpression of Leptin Rescues Insulin Resistance and Diabetes in a Mouse Model of Lipoatrophic Diabetes Ken Ebihara 1 , Yoshihiro Ogawa 1 , Hiroaki Masuzaki 1 , Mitsuyo Shintani 1 , Fumiko Miyanaga 1 , Megumi Aizawa-Abe 1 , Tatsuya Hayashi 1 , Kiminori Hosoda 1 , Gen Inoue 1 , Yasunao Yoshimasa 1 , Oksana Gavrilova 2 , Marc L. Reitman 2 and Kazuwa Nakao 1 1 Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, Kyoto, Japan 2 Diabetes Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland Abstract Lipoatrophic diabetes is caused by a deficiency of adipose tissue and is characterized by severe insulin resistance, hypoleptinemia, and hyperphagia. The A-ZIP/F-1 mouse (A-ZIPTg/+) is a model of severe lipoatrophic diabetes and is insulin resistant, hypoleptinemic, hyperphagic, and shows severe hepatic steatosis. We have also produced transgenic “skinny” mice that have hepatic overexpression of leptin (LepTg/+) and no adipocyte triglyceride stores, and are hypophagic and show increased insulin sensitivity. To explore the pathophysiological and therapeutic roles of leptin in lipoatrophic diabetes, we crossed LepTg/+ and A-ZIPTg/+ mice, producing doubly transgenic mice (LepTg/+:A-ZIPTg/+) virtually lacking adipose tissue but having greatly elevated leptin levels. The LepTg/+:A-ZIPTg/+ mice were hypophagic and showed improved hepatic steatosis. Glucose and insulin tolerance tests revealed increased insulin sensitivity, comparable to LepTg/+ mice. These effects were stable over at least 6 months of age. Pair-feeding the A-ZIPTg/+ mice to the amount of food consumed by LepTg/+:A-ZIPTg/+ mice did not improve their insulin resistance, diabetes, or hepatic steatosis, demonstrating that the beneficial effects of leptin were not due to the decreased food intake. Continuous leptin administration that elevates plasma leptin concentrations to those of LepTg/+:A-ZIPTg/+ mice also effectively improved hepatic steatosis and the disorder of glucose and lipid metabolism in A-ZIP/F-1 mice. These data demonstrate that leptin can improve the insulin resistance and diabetes of a mouse model of severe lipoatrophic diabetes, suggesting that leptin may be therapeutically useful in the long-term treatment of lipoatrophic diabetes. Footnotes Address correspondence and reprint requests to Dr. Yoshihiro Ogawa, Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan. E-mail: ogawa{at}kuhp.kyoto-u.ac.jp . Received for publication 4 October 2000 and accepted in revised form 15 March 2001. ANOVA, analysis of variance; BAT, brown adipose tissue; FFA, free fatty acid; RIA, radioimmunoassay; WAT, white adipose tissue.