Abstract
Glycogen deposition and glucose tolerance were examined in female mice after 24 days of oral treatment with natural (17 beta-estradiol and progesterone) and synthetic (ethinyl estradiol and norethisterone acetate) sex steroids, administered individually and in estrogen-progestin combination. Doses were 5 micrograms/kg/day for estrogens and 1 mg/kg/day for progestins. Compared with diestrus control mice, each treatment increased glycogen deposition in liver, uterus, heart and biceps femoris muscle. 17 beta-Estradiol produced the greatest increments. Progesterone produced considerably smaller increments and antagonized the glycogenic effects of 17 beta-estradiol. Ethinyl estradiol and norethisterone acetate generally induced similar changes in glycogen deposition. Treatments containing 17 beta-estradiol improved glucose tolerance. Although glucose tolerance was not significantly altered by the other sex steroid treatments, the changes in glycogen deposition indicate important effects on tissue carbohydrate metabolism.
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