Aiping M Zhao

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Effect of hyperglycemia and nitric oxide synthase inhibition on heat tolerance and induction of heat shock protein 72 kDa in vivo.

Christopher Swiecki; Alexander Stojadinovic; Jimie Anderson; Aiping Zhao; Harry Dawson; Terez Shea-Donohue (Profiled Authors: Terez Shea-Donohue; Aiping M Zhao)

Department of Surgery, Walter Reed Army Medical Center, Washington, DC, USA.
The American surgeon 2003;69(7):587-92.

Diabetes and nitric oxide synthase (NOS) inhibition both exacerbate mesenteric ischemia/ reperfusion injury. Heat shock protein 72 (HSP-72) protects against KDa ischemia/reperfusion damage in vivo. The effect of diabetes on HSP-72 expression in vivo is unknown. The aim of this study was to determine the effects of diabetes and NOS inhibition on HSP-72 induction in vivo. Rats were assigned to four groups: control (C), streptozotocin-induced diabetic (D), acute hyperglycemia (A), and L-N(omega)-nitro-L-arginine treated (L). Rats were subjected to hyperthermia and allowed to recover for 4 hours. Intestine and liver samples from heated (H) and nonheated (NH) rats were analyzed for HSP-72 by Western blot. HSP-72 levels were increased significantly in CH compared to CNH rats. No deaths occurred in CH rats; however, death rates were significant in AH, DH, and LH rats. DH rats died earlier than LH and AH rats. HSP-72 in liver and intestine was reduced significantly in LH rats. When compared with CH rats the surviving AH and DH rats exhibited similar HSP-72 levels in the liver. Diabetes, acute hyperglycemia, and L-N(omega)-nitro-L-arginine treatment lower heat stress tolerance. NOS is required for HSP-72 expression, but not survival. Diabetics who survive heat stress moderately express HSP-72. Characterization of altered thermotolerance and HSP-72 may provide mechanisms for the deranged diabetic stress response.

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