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Evidence of a circadian rhythm in nucleolar components of rat superior cervical ganglion neurons with particular reference to the fibrillar centers an ultrastructural and stereological analysis


, : Evidence of a circadian rhythm in nucleolar components of rat superior cervical ganglion neurons with particular reference to the fibrillar centers an ultrastructural and stereological analysis. Journal of Ultrastructure Research 77(1): 83-92

Adult male rats were artificially synchronized for 3 wk to a 12 h light/12 h dark programmed cycle with food and water ad lib. Every 4 h for 24 h and every 2 h between 2200 and 0700 h, groups of 3 animals were sacrificed by intracardiac perfusion. With each animal the superior cervical ganglion was removed and the mean volume of the nucleolar fibrillar centers (.hivin.Vfc(nu)) and of the other nucleolar components, i.e., fibrillar, granular and vacuolar components (.hivin.Vfgvac(nu)), determined by stereological analysis. The variations in .hivin.Vfc(nu) and .hivin.Vfgvac(nu) showed a normal distribution with a peak value found in animals sacrificed at 0100 h. The .hivin.Vfgvac(nu) increased smoothly to its maximum value, whereas the .hivin.Vfc(nu) increased slowly during an initial period from lights off to 2300 h and then rapidly up to its zenith. At least in these cells, the more or less marked development of both fibrillar centers and other nucleolar components follows a circadian rhythm.

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Accession: 005411068

PMID: 7299911

DOI: 10.1016/s0022-5320(81)80068-8

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