[1] Kanazawa Univ, Grad Sch Med Sci, Dept Biochem & Mol Vasc Biol, Kanazawa, Ishikawa 920, Japan
[2] Tokyo Womens Med Univ, Sch Med, Ctr Diabet, Tokyo, Japan
[3] Kanazawa Med Univ, Dept Biochem, Kanazawa, Ishikawa, Japan
[4] Daiichi Fine Chem Co Ltd, Res Lab, Takaoka, Toyama, Japan
[5] Osaka City Univ, Grad Sch Med, Dept Metab Endocrinol & Mol Med, Osaka 558, Japan