Abstract:
:It is known that endoplasmic reticulum (ER) stress is provoked under diabetic conditions and is possibly involved in the development of insulin resistance. In this study, using ER stress-activated indicator (ERAI) transgenic mice which express green fluorescent protein under ER stress conditions, we directly evaluated the effects of a diabetic agent pioglitazone on in vivo ER stress under diabetic conditions. In high fat and high sucrose diet-induced diabetic ERAI transgenic mice, 8 weeks of pioglitazone treatment reduced the accumulation of fat droplets in the liver and attenuated the development of insulin resistance. In the liver of the ERAI transgenic mice, ERAI fluorescence activity was clearly reduced as early as after 4 weeks of pioglitazone treatment, preceding the improvement of insulin resistance. In addition, after the pioglitazone treatment, serum free fatty acid and triglyceride levels were decreased, and serum adiponectin levels were increased. These data indicate that pioglitazone treatment suppresses ER stress in the liver which may explain, at least in part, the pharmacological effects of pioglitazone to reduce insulin resistance.
journal_name
Endocr Jjournal_title
Endocrine journalauthors
Yoshiuchi K,Kaneto H,Matsuoka TA,Kasami R,Kohno K,Iwawaki T,Nakatani Y,Yamasaki Y,Shimomura I,Matsuhisa Mdoi
10.1507/endocrj.k09e-140subject
Has Abstractpub_date
2009-01-01 00:00:00pages
1103-11issue
9eissn
0918-8959issn
1348-4540pii
JST.JSTAGE/endocrj/K09E-140journal_volume
56pub_type
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