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Journal Article

Differential expression of inhibin alpha and beta A subunit genes in rat and mouse ovarian follicles during pregnancy

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Seeburg,  Peter H.
Department of Molecular Neurobiology, Max Planck Institute for Medical Research, Max Planck Society;

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Citation

Penschow, J. D., Aldred, G. P., Darling, P. A., Haralambidis, J., Hammond, V. E., vanLeeuwen, B. H., et al. (1990). Differential expression of inhibin alpha and beta A subunit genes in rat and mouse ovarian follicles during pregnancy. JOURNAL OF MOLECULAR ENDOCRINOLOGY, 4(3), 247-255. Retrieved from http://jme.endocrinology-journals.org/cgi/content/abstract/4/3/247.


Cite as: http://hdl.handle.net/21.11116/0000-0000-7FD1-6
Abstract
Relative levels of rat ovarian alpha inhibin (alpha I) and beta A inhibin (beta AI) mRNAs were measured during pregnancy by dot-blot hybridization of ovarian poly(A+) RNA. Follicular patterns of alpha I and beta AI expression in contralateral ovaries from the same rats were also studied by hybridization histochemistry. Oligodeoxynucleotide probes specific for porcine alpha I and beta AI were synthesized, 32P end-labelled and used as hybridization probes on dot-blots of ovarian RNA and frozen sections of ovarian tissue from pregnant rats. During pregnancy, levels of alpha I and beta AI mRNAs remained fairly constant from day 7 after mating until parturition and then fell within 16 h post partum. In all ovaries observed, expression of inhibin genes was located in granulosa cells of healthy antral follicles. In general, the strongest signals for alpha I and beta AI mRNAs were obtained in large follicles, with weaker signals in smaller follicles. Follicular patterns of alpha I and beta AI expression during pregnancy were often dissimilar when alpha I and beta AI were compared over a range of follicles. Considerable alpha I mRNA was detectable in some follicles in which beta AI was reduced or undetectable, despite strong signals for both alpha I and beta AI in an adjacent follicle. Essentially, alpha I mRNA levels were relatively consistent between groups of follicles, whereas beta AI levels varied considerably. beta AI mRNA was never observed in a follicle in the absence of alpha I mRNA, indicating that activin production in any follicle occurs in the presence of alpha I mRNA. (ABSTRACT TRUNCATED AT 250 WORDS).