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  • Title: Neural control of circadian rhythms in plasma ACTH, plasma corticosterone and motor activity.
    Author: Szafarczyk A, Ixart G, Alonso G, Malaval F, Nouguier-Soule J, Assenmacher I.
    Journal: J Physiol (Paris); 1981 Mar; 77(8):969-76. PubMed ID: 6281423.
    Abstract:
    The circadian rhythms for plasma ACTH and corticosterone (B), as well as motor activity, were explored in female rats after ocular enucleation (O-X), stereotaxic lesion of the suprachiasmatic nuclei (SCN-X) or of midbrain raphe nuclei (R-X), or both O-X and R-X, pharmacological blockade of the serotoninergic (5HT) system by pCPA, sometimes bypassed by 5-HTP, or 5-HT denervation of the SCN by local injection of 5,7-DHT. The three circadian rhythms explored responded quite differently to the treatments. In particular, the ACTH and B rhythms lost their usual close correlations. The amplitude and mean level of ACTH fluctuations were depressed after all treatments, but remained normal or were enhanced for B rhythm. ACTH rhythmicity actually was undetectable after SCN-X, pCPA and, in several rats, combined O-X and R-X, whereas persisting circadian and/or ultradian B and locomotor activity rhythms were always measured. The participation of the suprachiasmatic nuclei, the midbrain raphe nuclei and other possible 5-HT components in a complex circadian pacemaker system is discussed.
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