期刊
NATURE
卷 468, 期 7321, 页码 305-U193出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/nature09511
关键词
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资金
- Dr. Miriam and Sheldon G. Adelson Medical Research Foundation
- Larry L. Hillblom Foundation
- Coelho Endowment
- National Institutes of Health/National Institute of Neurological Disorders and Stroke [NS30549]
- American Heart Association
- New Zealand Neurological Foundation
- Health Research Council of New Zealand
Stroke is a leading cause of disability, but no pharmacological therapy is currently available for promoting recovery. The brain region adjacent to stroke damage-the peri-infarct zone-is critical for rehabilitation, as it shows heightened neuroplasticity, allowing sensorimotor functions to re-map from damaged areas(1-3). Thus, understanding the neuronal properties constraining this plasticity is important for the development of new treatments. Here we show that after a stroke in mice, tonic neuronal inhibition is increased in the peri-infarct zone. This increased tonic inhibition is mediated by extrasynaptic GABA(A) receptors and is caused by an impairment in GABA (gamma-aminobutyric acid) transporter (GAT-3/GAT-4) function. To counteract the heightened inhibition, we administered in vivo a benzodiazepine inverse agonist specific for alpha 5-subunit-containing extrasynaptic GABA(A) receptors at a delay after stroke. This treatment produced an early and sustained recovery of motor function. Genetically lowering the number of alpha 5- or delta-subunit-containing GABA(A) receptors responsible for tonic inhibition also proved beneficial for recovery after stroke, consistent with the therapeutic potential of diminishing extrasynaptic GABA(A) receptor function. Together, our results identify new pharmacological targets and provide the rationale for a novel strategy to promote recovery after stroke and possibly other brain injuries.
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