Pineal beta-adrenergic receptor: diurnal variation in sensitivity.

The responsiveness of the pineal beta-adrenergic receptor that regulates serotonin-N-acetyltransferase activity is nearly ten times greater at the end of the light period (0600 to 1800 hours) than at the end of the dark period (1800 to 0600 hours). These changes in sensitivity of the postsynaptic beta-adrenergic receptor are related to diurnal changes in… CONTINUE READING