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Activation of the adenosine A2A receptor at the acute stage of moderate traumatic brain injury enhances the neuroprotective effects of oxaloacetate 

YANG Nan, HUANG Zhi-Zhong, TAN Si-Wei, CHEN Xing, PENG Yan, ZHOU Yuan-Guo, NING Ya-Lei^*

Department of Army Occupational Disease, Daping Hospital, Army Medical University; The Molecular Biology Center, State Key Laboratory of Trauma, Burn and Combined Injury, Chongqing 400042, China

Abstract

The purpose of the present study was to investigate the effect of glutamate scavenger oxaloacetate (OA) combined with CGS21680, an adenosine A2A receptor (A2AR) agonist, on acute traumatic brain injury (TBI), and to elucidate the underlying mechanisms. C57BL/6J mice were subjected to moderate-level TBI by controlled cortical impact, and then were treated with OA, CGS21680, or OA combined with CGS21680 at acute stage of TBI. At 24 h post TBI, neurological severity score, brain water content, glutamate concentration in cerebrospinal fluid (CSF), mRNA and protein levels of IL-1β and TNF-α, mRNA level and activity of glutamate oxaloacetate aminotransferase (GOT), and ATP level of brain tissue were detected. The results showed that neurological deficit, brain water content, glutamate concentration in CSF, and the inflammatory cytokine IL-1β and TNF-α production were exacerbated in CGS21680 treated mice. Administrating OA suppressed the rise of both glutamate concentration in CSF and brain water content, and elevated the ATP level of cerebral tissue. More interestingly, neurological deficit, brain edema, glutamate concentration, IL-1β and TNF-α levels were ameliorated significantly in mice treated with OA combined with CGS21680. The combined treatment exhibited better therapeutic effects than single OA treatment. We also observed that GOT activity was enhanced in single CGS21680 treatment group, and both the GOT mRNA level and GOT activity were up-regulated in early-stage combined treatment group. These results suggest that A2AR can improve the efficiency of GOT and potentiate the ability of OA to metabolize glutamate. This may be the mechanism that A2AR activation in combination group augmented the neuroprotective effect of OA rather than aggravated the brain damages. Taken together, the present study provides a new insight for the clinical treatment of TBI with A2AR agonists and OA.

Key words: traumatic brain injury; adenosine A2A receptor; oxaloacetate; glutamate oxaloacetate aminotransferase; energy metabolism

Received: 　　Accepted:

Corresponding author: 宁亚蕾　　E-mail: ylning@outlook.com

DOI: 10.13294/j.aps.2022.0051

Citing This Article：

YANG Nan, HUANG Zhi-Zhong, TAN Si-Wei, CHEN Xing, PENG Yan, ZHOU Yuan-Guo, NING Ya-Lei. Activation of the adenosine A2A receptor at the acute stage of moderate traumatic brain injury enhances the neuroprotective effects of oxaloacetate . Acta Physiol Sin 2022; 74 (4): 505-512 (in Chinese with English abstract).