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In vivo steroid metabolism in primates--a review.

Similarities and differences in the steroid metabolism between humans and nonhuman primates were compared. Estrogen and progesterone metabolism of rhesus monkeys was especially studied. In these monkeys the estrogen peak in the middle of the cycle coincides with the luteinizing hormone (LH) peak while in humans the estrogen peak precedes the LH peak. The progestagen values in the plasma are lower in rhesus monkeys than in humans and the premenstrual decrease begins earlier. The 17-hydroxyprogesterone values in the plasma are 2-3 times higher in these monkeys than in humans. Other variations in different species of monkeys have been observed. In the marmoset the serum estrogen and progesterone values are many times higher than in other species and are 10 times higher than values in humans. The gorilla is most like humans in that estriol forms the major part of urinary estrogen. From published results it is concluded that using nonhuman primates as models for studies in humans must be done with caution. Baboons seem the most suitable but are scarce and expensive. Differences are mostly quantitative. The 16-hydroxylation of estrogens and the principal qualitative differences reported.