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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Selective inactivation or reconstitution of adenosine A2A receptors in bone marrow cells reveals their significant contribution to the development of ischemic brain injury.

Inactivation of the adenosine A(2A) receptor (A(2A)R) consistently protects against ischemic brain injury and other neural insults, but the relative contribution of A(2A)Rs on peripheral inflammatory cells versus A(2A)Rs expressed on neurons and glia is unknown. We created a chimeric mouse model in which A(2A)Rs on bone marrow-derived cells (BMDCs) were selectively inactivated or reconstituted by bone marrow transplantation. Selective reconstitution of A(2A)Rs on BMDCs (A(2A)R knockout mice transplanted with wild-type bone marrow cells) largely reinstates ischemic brain injury in global A(2A)R knockout mice. Conversely, selective inactivation of A(2A)Rs on BMDCs (wild-type mice transplanted with A(2A)R knockout bone marrow cells) attenuates infarct volumes and ischemia-induced expression of several proinflammatory cytokines in the brain, but exacerbates ischemic liver injury. These results indicate that the A(2A)R-stimulated cascade in BMDCs is an important modulator of ischemic brain injury and that ischemic brain and liver injuries are regulated distinctly by A(2A)Rs on BMDCs.[1]


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