Abstract
Tumor necrosis factor (TNF) is first identified as a mediator of lethal endotoxin poisoning. The anti-TNF therapy in the treatment of rheumatoid arthritis is based on the recognition of the role of TNF as the master regulator. Type II diabetes is characterized with altered stem cells and reduced vasculogenesis. Therefore, we aimed to determine if TNF inhibitor would improve vasculogenesis in ischemic hind-limbs of diabetic mice. Fifty male type 2 diabetic and their control (8-10weeks old mice) were used, and ischemia was induced in the hind-limbs of all mice for 28days. Vessel density was assessed by high-definition microangiography at the end of the treatment period. After 4weeks, vessel density displayed no difference between the ischemic and the non-ischemic legs in control mice. However, in diabetic mice, the ischemic hind-limb vessel density was significantly decreased. Interestingly, diabetic mice displayed a significant improved vasculogenesis when treated with TNF inhibitor. Moreover, this data was confirmed by capillary density determined by immunostaining. TNF inhibitors are able to improve the formation of microvessels in response to ischemia in type 2 diabetes.
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