Intraventricular Carbachol Mimics the Effects of Light on the Circadian Rhythm in the Rat Pineal Gland

Abstract

Environmental lighting regulates numerous circadian rhythms, including the cycle in pineal serotonin N -acetyltransferase activity. Brief exposure of rats to light can shift the phase of this enzyme's circadian rhythm. Light also rapidly reduces nocturnal enzyme activity. Intraventricular injections of carbachol, a cholinergic agonist, can mimic both of these effects. Light and carbachol presumably act on the suprachiasmatic nucleus of the hypothalamus. These experiments demonstrate the feasibility of using a neuropharmacologic approach to the mechanisms underlying mammalian circadian rhythms.