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Biomedical subjects

C H Shackleton

Publications and source records attributed to C H Shackleton.

At least 163 records · Page 9Linked to original sources
PubMed1975

The in vivo metabolism of cortisol and corticosterone by the macaque monkey (Macaca fascicularis).

(4-14C) Cortisol was administered intramuscularly to one adult female macaque monkey, MF3 (Macaca fascicularis). To adult female macaque monkey, MF4, (4-14C)corticosterone was administered intramuscularly. Urine samples were collected and the metabolites excreted identified using gas chromatography, radio-gas chromatography and gas chromatography-mass spectrometry. The principal metabolites of cortisol were identified as glucuronide conjugates of 11-oxygenated-17-oxosteroids. The excretion of tetrahydrocortisol and tetrahydrocortisone relative to the other corticosteroid metabolites was low compared with that of man. Two compounds, 3 beta-cortol and 3 beta-cortolone not normally present in human urine were identified in the urine from this species. The prinicpal metabolites of corticosterone were glucuronide conjugates of hexahydroCompound A and hexahydrocorticosterone. Two unidentified radioactive compounds were also present.

Androgens↗
PubMed1975

Studies on plasma corticosteroids in the rhesus monkey (Macaca mulatta).

The physiological regulation of the plasma corticosteroid concentration, measured by competitive protein-binding, was studied in female rhesus monkeys (M. mulatta) sedated with phencyclidine hydrochloride. Morning basal levels of plasma corticosteroids were found to be in the range 8-0-25-2 mug/100 ml, which is lower than that previously reported in this species. A circadian rhythm in plasma cortisol concentration was demonstrated. Prolonged sedation with phencyclidine was associated with a gradual increase in the plasma cortisol concentration. Synthetic alpha1-24 adrenocorticotrophic hormone given intravenously caused a rapid rise in plasma cortisol, the minimum effective dose was between 1 and 10 ng/kg body weight and the response was maximal after 1000 ng/kg. The administration of lysine-vasopressin and the induction of hypoglycaemia by insulin were both followed by an increase in the plasma corticosteroid concentration. Metyrapone caused a decline in plasma 11-hydroxycorticosteroids and a concomitant increase in total corticosteroids measured by competitive protein-binding. It is concluded that the hypothalamic-pituitary-adrenal system in the rhesus monkey functions in a manner which is qualitatively and quantitatively similar to that of man.

11-Hydroxycorticosteroids↗