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  • Title: [Structural characteristics of the thyroid and parathyroid C cells of monkeys during head-down tilt hypokinesia].
    Author: Plakhuta-Plakutina GI, Savina EA, Dmitrieva NP, Amirkhanian EA, Belkaniia GS.
    Journal: Kosm Biol Aviakosm Med; 1984; 18(2):73-7. PubMed ID: 6716950.
    Abstract:
    Eight monkeys Macaca rhesus were exposed to head-down tilt for 7 days and to clinostatic hypokinesia for 7 days with subsequent 12-day head-down tilt. C cells of the thyroid gland and the parathyroid glands of 5 control and 8 experimental monkeys were investigated histologically, morphometrically and electron-microscopically. On the 7th tilt day the C cell population increased, their nuclei grew significantly, synthesis activated, and secretory granules accumulated. By day 19 most C cells were in the secretion stage. Morphological signs of an increased functional activity of the thyroid gland were seen on experimental day 7 and those of the parathyroid gland on day 19, both in light and electron microscopies. Taking into account the antagonism of C cells and parathyroid glands, it can be assumed that the hypocalcemic effect of calcitonin plays a part in the stimulation of parathyroid glands during head-down tilt.
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