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Different effects of adenosine A2A receptors in the models of traumatic brain injury and peripheral tissue injury

Dai Shuangshuang, Xiong Renping, Yang Nan, Li Wei, Zhu Peifang, Zhou Yuanguo

Molecular Biology Center, State Key Laboratory of Trauma, Burn and Combined Injury, Research Institute of Surgery and Daping Hospital, the Third Military Medical University.Chongqing 400042

Abstract

Recently, activation of the adenosine A2A receptors has been shown to exert protection against peripheral tissue injuries but aggravation in the central nervous system (CNS) injuries. To explore the different effects of adenosine A2A receptors and try to performsome new treatment strategies for peripheral tissue and CNS traumas, we constructed the mouse models of skin trauma, skin combined radiation-impaired wound and traumatic brain injury (TBI), respectively. Wild type mice and A2A receptor gene knockout mice were both used in the experiments. In skin trauma and combined radiation-impaired wound models, the time of wound healing was observed,while in TBI model, neurological deficit scores, water content in injured brain and glutamate concentration in cerebral spinal fluid (CSF)were detected at 24 h after TBI. The results showed that in skin trauma and combined radiation-impaired wound models, CGS21680(an agonist of the A2A receptors) promoted while A2A receptor gene knockout delayed the course of skin wound healing. On the contrary, in TBI model, A2A receptor gene knockout, not CGS21680, showed a protective role by inhibition of glutamate release.These data further indicate that promoting glutamate release may account for the different effects of A2A receptor activation in CNS injury and peripheral tissue injury models. These findings may provide some experimental evidence and a new strategy for clinical treatment of peripheral tissue damages by agonists of A2A receptors, while treatment of CNS injuries by antagonists of A2A receptors.

Key words: A2A receptor;traumatic brain injury;Wound healing;combined radiation-impaired wound

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Citing This Article：

Dai Shuangshuang, Xiong Renping, Yang Nan, Li Wei, Zhu Peifang, Zhou Yuanguo. Different effects of adenosine A2A receptors in the models of traumatic brain injury and peripheral tissue injury. Acta Physiol Sin 2008; 60 (2): 254-258 (in Chinese with English abstract).