c-fos activity in Rana esculenta testis: seasonal and estradiol-induced changes.

Abstract:

:Estradiol-17beta (E2) is suspected to exert a role in the regulation of testicular activity. Using a nonmammalian vertebrate model (the frog, Rana esculenta), we have investigated whether c-fos activity is detectable in the testis during the annual sexual cycle and whether E2 exerts a regulatory role on spermatogenesis through fos activity. FOS protein is available in testicular nuclear extracts (about 60 kDa) and, surprisingly, also in cytosolic extracts (about 60, 80, and 100 kDa). Estradiol induces primary spermatogonia (ISPG) proliferation [this effect is counteracted by antiestrogens (Tamoxifen and ICI 182-780)] and FOS appearance in testicular cytosolic extracts as well as c-fos transcription. Also, this effect is counteracted by ICI 182-780. Interestingly, the number of FOS immunopositive nuclei of ISPG strongly increases after E2 treatment, whereas a great increase of immunopositivity in the cytoplasm of ISPG is observed with the contemporaneous treatment with antiestrogens. In conclusion, our results demonstrate that E2 induces ISPG multiplication in the frog, R. esculenta, and, for the first time in a vertebrate species, that it triggers c-fos activity in the testis. Moreover, E2 may be involved in mechanisms related to FOS transport in the nucleus of ISPG to induce the mitotic activity.

journal_name

Endocrinology

journal_title

Endocrinology

authors

Cobellis G,Pierantoni R,Minucci S,Pernas-Alonso R,Meccariello R,Fasano S

doi

10.1210/endo.140.7.6790

subject

Has Abstract

pub_date

1999-07-01 00:00:00

pages

3238-44

issue

7

eissn

0013-7227

issn

1945-7170

journal_volume

140

pub_type

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