24-hour rhythm of hypothalamic melatonin immunofluorescence correlates with serum and retinal melatonin rhythms.
The 24-hour rhythm of retinal and hypothalamic melatonin immunofluorescence was determined in male albino rats and compared to the 24-hour rhythm of serum melatonin determined by radioimmunoassay. Under a 12-hour (0:00-12:00): 12-hour dark cycle, the 24-hour rhythm of melatonin immunocytochemical fluorescence in the retina was biomodal (crests at 1:00 and 10:00-13:00). In serum, melatonin has a single crest late in the dark period (18:00). In the hypothalamus melatonin immunofluorescence showed increments corresponding to the crests in retina (13:00) and serum (18:00). In a 2-hour light: 22-hour dark cycle, the retinal rhythm was suppressed, the serum rhythm unchanged, and the hypothalamic rhythm had a single crest corresponding to the crest of the serum melatonin rhythm. These data indicate that the 24-hour hypothalamic rhythm of melatonin immunofluorescence may be secondary to the serum and retinal 24-hour rhythms of melatonin.
D000818:Animals; D002940:Circadian Rhythm / Q000528:radiation effects; D003624:Darkness; D005455:Fluorescent Antibody Technique; D006651:Histocytochemistry; D007031:Hypothalamus / Q000378:metabolism*; D008027:Light; D008297:Male; D008550:Melatonin / Q000097:blood / Q000378:metabolism*; D010507:Periodicity; D011863:Radioimmunoassay; D051381:Rats; D011919:Rats, Inbred Strains; D012160:Retina / Q000378:metabolism*
D008550:Melatonin