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  • Title: Suprachiasmatic nuclei lesions do not eliminate the circadian rhythms of electrolyte excretion in the rat.
    Author: Stoynev AG, Ikonomov OC, Vrabchev NC, Usunoff KG.
    Journal: Physiol Behav; 1986; 38(5):657-62. PubMed ID: 3823179.
    Abstract:
    The 24-hour variations in 2-hour diuretic and saluretic action of furosemide (4 mg/kg) given at 8, 12, 16, 20, 24 or 4 hr and the circadian rhythms of food and water intake, urine and electrolyte excretion followed for two consecutive days at 4-hour intervals were investigated in suprachiasmatic nuclei (SCN)-lesioned or sham-operated male Wistar rats. The results showed that: a distinct 24-hour rhythm in furosemide-induced urine, sodium and chloride excretion persisted after SCN lesions, and the lesions abolished the circadian rhythms of food and water intake but only desynchronized the individual 24-hour variations in electrolyte excretion. We concluded that SCN play a role as a central synchronizer but not as a major oscillator of the circadian rhythms of electrolyte excretion in the rat.
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