The influence of the thymus on beta-adrenoceptors has been studied in the brain cortex of mice during developing and aging. Affinity of beta-adrenoceptors shows no statistically significant changes in the various animal models investigated. Receptor density shows a fall in both athymic nude mice and in old normal mice. Receptor density, in particular, decreases progressively with advancing age. It has been demonstrated that thymus exerts a regulatory role in both development and aging, as a neonatal thymic graft is capable of reversing the receptor impairments found in young athymic nude mice and in old normal mice.
- brain cortex
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