Corticotropin-releasing factor: a marked circadian rhythm in primate cerebrospinal fluid peaks in the evening and is inversely related to the cortisol circadian rhythm.


Continuous sampling of cerebrospinal fluid (CSF) over 24-h periods in 10 rhesus monkeys revealed a 2-fold, highly reproducible circadian rhythm in CRF concentrations. Peak CRF values of 77.9 +/- 6.4 pg/ml occurred in the evening at 1930 h, while the CRF nadir (38.4 +/- 4.2 pg/ml) occurred at 0745 h. Simultaneously sampled CSF cortisol peaked at 0913 h, with… (More)


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