[Morphofunctional characteristics of adrenal reactivity in rats of different ages].
Ultrastructural peculiarities of the cortical and medullary substance of the adrenals have been studied in mature (8-month-old) and old (26-month-old) intact white male rats and in rats of the same age groups in 3 h after electrical stimulation of the hypothalamic ventromedial nuclei. By means of certain biochemical methods contents of hormones (corticosterone, adrenaline and noradrenaline) have been estimated, as well as that of cholesterin and ascorbic acid in blood and adrenal tissues. After the hypothalamus is stimulated in the mature rats, certain peculiarities in the adrenals reactivity are revealed; they demonstrate positive ultrastructural and functional correlation of secretory cells in the cortex and medulla and are characterized with hypertrophy of the nuclei, increased amount of polyribosomes, hypertrophied Golgi complex and canaliculi of the endoplasmic reticulum and increased contents of corticosteroids and catecholamines in blood. In the old rats after stimulation of the hypothalamus, certain unequal ultrastructural and functional peculiarities are revealed. They demonstrate both disturbance of the hypothalamic regulation of the adrenal function at ageing and decreased adaptive possibilities of the adrenal secretory cells at the subcellular level.
Bezrukov
V V
VV
Shaposhnikov
V M
VM
D000302:Adrenal Cortex / Q000502:physiology / Q000648:ultrastructure; D000311:Adrenal Glands / Q000502:physiology / Q000648:ultrastructure*; D000313:Adrenal Medulla / Q000502:physiology / Q000648:ultrastructure; D000375:Aging / Q000502:physiology*; D000818:Animals; D004558:Electric Stimulation; D006651:Histocytochemistry; D007031:Hypothalamus / Q000502:physiology; D008297:Male; D008854:Microscopy, Electron; D051381:Rats
Morfofunktsional'nye osobennosti reaktivnosti nadpochechnikov krys raznogo vozrasta.