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Cerebral ischemia induced by unilateral carotid occlusion in rats decreases in an asymmetric manner the number of beta-adrenergic receptors in microvessels prepared from cerebral cortexes ipsilateral and contralateral to the side of the ligature. In particular, the reduction is more pronounced in the left hemisphere in case of both right and left carotid ligature. The greater receptor decrease in the left side of the brain was shown to depend on the integrity of interhemispheric connections. We show that the changes in capillary beta-adrenergic receptors in response to unilateral carotid occlusion are qualitatively modified during aging. In particular, the asymmetry in the response pattern observed in young rats is lost. The mechanisms underlying this phenomenon may be based on an age-related impairment in the transfer of neuronal information between the two sides of the brain.

Aging modifies the asymmetry in brain microvascular regulation.