Abstract
Daily variations of catecholamine concentrations in the blood and lymphoid organs in Wistar rats were revealed. Daily fluctuations of epinephrine and norepinephrine levels in the spleen and blood were synchronous. Circadian variations of epinephrine in the thymus, lymph nodes, and plasma were synphasic. A relationship between neurotransmitter concentrations and expression of β-adrenoceptors on thymic and splenic lymphocytes was noted.
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