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The endometrial scrapings obtained from the uteri of estrogen-progesterone-treated and estrogen-treated rabbits were incubated with N-acetyl-D-[1-3H]glucosamine and [35S]sulfate, and then the incubation medium (M-Fr) was separated from the tissue. The tissue was subsequently homogenized exhaustively in 0.25 M sucrose, and the insoluble residue (R-Fr) was separated. The supernatant at 8,5000 X g for 10 min of the homogenate was subjected to subcellular fractionation by discontinuous sucrose gradient ultracentrifugation, and a Golgi-rich fraction (G-Fr) was obtained. Crude glycoconjugates (glycosaminoglycans and glycoproteins) were then separated from M-Fr, R-Fr and G-Fr after pronase digestion. The amounts of the radioactivities incorporated into these glycoconjugates suggested that progesterone markedly suppressed the estrogen effect within 6 hr in R-Fr and G-Fr, whereas the suppression slightly delayed in M-Fr. The amounts of the radioactivities incorporated into acidic GC, which obtained by CPC-precipitation of the crude GC after digestion with crude heparinase, indicated that the biosynthesis of the CPC-precipitable sulfated glycoproteins was almost completely ceased by progesterone, although other glycoconjugates were still actively synthesized under the progesteronic condition.

Progesterone effect on the biosynthesis of glycoconjugates, specifically of sulfated glycoprotein, in the endometrium of rabbit uterus.