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Horm Metab Res 2010; 42(11): 775-780
DOI: 10.1055/s-0030-1261952
Original Basic

© Georg Thieme Verlag KG Stuttgart · New York

Indomethacin Activates Peroxisome Proliferator-activated Receptor γ to Improve Insulin Resistance in Cotton Pellet Granuloma Model

H.-T. Wu1 , W. Chen2 , K.-C. Cheng3 , C.-H. Yeh4 , K.-H. Shen5 , J.-T. Cheng1 , 4 , 5
  • 1Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan City, Taiwan
  • 2Department of Internal Medicine, E-Da Hospital and I-Shou University, Kaohsiung County, Taiwan
  • 3Department of Psychosomatric Internal Medicine, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima City, Japan
  • 4Institute of Medical Science, College of Health Science, Chang Jung Christian University, Guei-Ren, Tainan County, Taiwan
  • 5Department of Medical Research and Department of Urology, Chi-Mei Medical Center, Yong Kang City, Tainan County, Taiwan
Further Information

Publication History

received 26.05.2010

accepted 24.06.2010

Publication Date:
27 July 2010 (online)

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Abstract

Inflammation is involved in the development of insulin resistance and diabetes. However, the effectiveness of anti-inflammatory drugs in diabetic therapy remains obscure. In the present study, the possible mechanisms of indomethacin, one of the nonsteroidal anti-inflammatory drugs, in the improvement of insulin resistance were investigated. Indomethacin treatment significantly decreased cotton pellet implantation induced white blood cell count elevation and immune cells infiltration in epididymal white adipose tissue. Also, cotton pellet implantation induced impaired glucose utilization and insulin resistance were improved by indomethacin. The decrement in phosphoinsulin receptor and phospho-Akt levels induced by cotton pellet implantation was improved by indomethacin as well. Moreover, indomethacin decreased cyclooxygenase-2 (COX-2) and inducible nitric oxide synthase (iNOS) expression in epididymal white adipose tissue with a marked reduction of prostaglandin 2 (PGE2) and nitrite/nitrate (NOx) levels in cotton pellet-implanted mice. Furthermore, pretreatment of peroxisome proliferator-activated receptor γ (PPARγ) antagonist, GW9662 not only reversed indomethacin-modified COX-2 and iNOS levels but also reversed indomethacin-improved insulin sensitivity determined by homeostasis model assessment-insulin resistance (HOMA-IR). Taken together, indomethacin might elevate the expression of PPARγ to decrease serum NOx and PGE2 to result in the improvement of insulin resistance.

Key words

cotton pellet granuloma - diabetes - indomethacin - insulin resistance - nitric oxide - peroxisome proliferator-activated receptor γ - prostaglandin E2

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Correspondence

J.-T. Cheng

Departmnt of Medical Research

Chi-Mei Medical Center

Yong Kang City

Tainan County

73101 Taiwan

Phone: +886/6/331 8516

Fax: +886/6/238 6548

Email: m980103@mail.chimei.org.tw