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Adenosine A2A receptors (A2ARs) in distinct cellular types may exert different and even opposite effects on many neurologic disorders; A2ARs in bone marrow-derived cells (BMDCs) have been shown to play important roles in various brain injuries. We previously showed that global A2AR inactivation aggravates chronic cerebral hypoperfusion-induced white matter lesions (WMLs); however, the specific cell populations responsible for A2AR-mediated signaling remain unknown. In the present study, we developed chimeric mice in which A2ARs were either selectively inactivated or reconstituted in BMDCs by transplanting bone marrow from global A2AR gene knockout or wild-type mice into wild-type or gene knockout mice, respectively. Chimeric mice were subsequently subjected to chronic cerebral hypoperfusion by bilateral common carotid artery stenosis, and the effects of BMDC A2ARs on WMLs were evaluated. The selective inactivation of A2AR in BMDCs aggravated chronic cerebral hypoperfusion-induced WMLs, promoted microglial activation, and increased proinflammatory cytokine expression, whereas the selective reconstitution or activation of A2AR in BMDCs using the agonist CGS21680 produced the opposite effects. These results demonstrate that A2ARs in BMDCs are important modulators of WMLs induced by chronic cerebral hypoperfusion; this modulation might be associated with the regulation of inflammatory cytokine production.

journal of neuropathology and experimental neurology

Critical Contribution of Adenosine A<sub>2A</sub>Receptors in Bone Marrow–Derived Cells to White Matter Lesions Induced by Chronic Cerebral Hypoperfusion

Critical Contribution of Adenosine A2AReceptors in Bone Marrow–Derived Cells to White Matter Lesions Induced by Chronic Cerebral Hypoperfusion

Critical Contribution of Adenosine A_2AReceptors in Bone Marrow–Derived Cells to White Matter Lesions Induced by Chronic Cerebral Hypoperfusion