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On the specificity of prostaglandin and steroid induced inhibition of 3H-proline incorporation in the human follicular wall

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Abstract

Experiments were carried out to elucidate whether the previously reported inhibitory effect of prostaglandin (PG) E2 on 3H-proline incorporation into total protein of specimens from the isolated preovulatory human follicular wall could be exerted also by other prostanoids. Moreover, investigations were designed to explore if the previoulsy documented inhibitory effect of steroids on 3H-proline incorporation could be mediated by endogenously formed PGs. Tissue specimens from the apical wall of follicles were incubated in the presence of PGF2α, 6-keto-PGF1 α, progesterone (P) or 17β-estradiol (E2). The steroids were added alone or in combination with the PG synthetase blockers, indomethacin or 5, 8, 11, 14-eicosatetraynoic acid. Following incubation with 3H-proline for 2–4 h, the incorporated radioactivity was determined. PGF2α and 6-keto-PGF1α had no effect on 3H-proline incorporation. Both P and E2 induced a significant decrease of 3H-proline incorporation in preovulatory follicles, whereas similar effects in unripe follicles were statistically significant only for P. The steroid effects were not influenced when blockers of PG synthesis were added concomitantly. It is concluded that among the “classical” PGs PGE2 has a unique effect on collagen metabolism in the human follicular wall. E2 and especially P have a similar inhibitory effect on collagen formation as reflected by measurements of 3H-proline incorporation, an effect which does not appear to be primarily mediated by endogenous PGs.

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Authors and Affiliations

  1. Department of Obstetrics and Gynecology, University of Göteborg, S-413 45, Göteborg, Sweden

    J. Tjugum,  Anders Norström, B. Dennefors & L. Hamberger

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  1. J. Tjugum
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  2. Anders Norström
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  3. B. Dennefors
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  4. L. Hamberger
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Tjugum, J., Norström, A., Dennefors, B. et al. On the specificity of prostaglandin and steroid induced inhibition of 3H-proline incorporation in the human follicular wall. J Endocrinol Invest 10, 531–535 (1987). https://doi.org/10.1007/BF03346987

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  • DOI: https://doi.org/10.1007/BF03346987

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