Lymphocyte beta-adrenergic receptor function and norepinephrine (NE) plasma concentration have been compared in normal subjects and in ethanol-addicted patients of different ages. Direct measurement of the density and properties of beta-adrenoceptors in membrane fractions was performed using the radioligand 125I-Iodocyanopindolol (ICYP). In normal subjects beta-receptor density decreased and norepinephrine plasma concentration increased with age. There was a statistically significant negative correlation between plasma norepinephrine and beta-receptor number. In ethanol-addicted patients the age-related modification in beta-receptor number and the correlation between plasma norepinephrine and beta-receptor density were lost, in spite of the fact that the increase of NE plasma concentration was still present. The ethanol-induced effects in lymphocyte beta-receptor may have consequences on immunological function and may be qualitatively similar to alterations in other tissues not routinely accessible in humans.
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