Eur J Endocrinol
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DOI: 10.1530/eje.0.1430133
European Journal of Endocrinology, Vol 143, Issue 1, 133-138
Copyright © 2000 by European Society of Endocrinology
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Articles

Human GnRH-secreting cultured neurons express activin betaA subunit mRNA and secrete dimeric activin A

P Florio, GB Vannelli, S Luisi, T Barni, R Zonefrati, C Falaschi, G Bifulco, AR Genazzani, and F Petraglia

Department of Reproductive Medicine and Child Development, Division of Obstetrics and Gynecology, University of Pisa, Pisa, Italy.

OBJECTIVE: To evaluate the expression of activin betaA-subunit mRNA and the secretion of activin A in/from cultured GnRH-secreting neuronal cells cloned from human olfactory epithelium (FNC-B4), which showed biochemical and antigenic properties of GnRH-secreting neurons. DESIGN: FNC-B4 cells were cultured in basal and conditioned media. METHODS: Reverse transcription-polymerase chain reaction (RTR-PCR) evaluated the expression of activin betaA-subunit mRNA. By using a specific ELISA, dimeric activin A concentrations were measured in culture media, in the absence or presence of carvone or forskolin and with different doses of progesterone, GnRH, and estradiol. RESULTS: RT-PCR experiments performed on total RNA isolated from FNC-B4 cells, using specific primers for the activin betaA gene, showed a 787bp DNA band corresponding to the betaA gene. FNC-B4 cells secreted activin A, and the highest accumulation in conditioned medium was achieved after 3h culture: the addition of forskolin, but not of carvone, was able to stimulate the release of activin A from cultured neuronal cells (P<0.01). When progesterone or GnRH was added, a significant accumulation of activin A was observed (P<0.01), while estradiol administration did not significantly affect activin A secretion. CONCLUSION: To date, this is the only study, in an in vitro human model reporting, that GnRH-secreting neuronal cells expressed activin betaA-subunit mRNA, and released dimeric activin A in culture medium. The expression and secretion of activin suggests that in these cells activin A might exert its action by autocrine/paracrine mechanisms.


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