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Differential dopamine-induced prolactin mRNA levels in various prolactin-secreting cell (sub)populations

par Kazemzadeh, M.;Velkeniers, Brigitte;Herregodts, Patrick;Collumbien, Robert;Finne, Eivind Farmen;Derde, Marie Paule;Vanhaelst, Luc ;Peters, Elisabeth
Référence Journal of Endocrinology, 132, 3, page (401-409)
Publication Publié, 1992

Article révisé par les pairs

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Résumé :

We have examined the effects of dopamine on prolactin gene expression using quantitative in-situ hybridization histochemistry in different pituitary cell (sub)populations separated according to their density on a discontinuous Percoll gradient. Administration of dopamine resulted in a drastic reduction in hybridization of 35S-labelled DNA probe complementary to prolactin mRNA in total pituitary cells and in lactotrophs with low density. In contrast, dopamine significantly stimulated mRNA accmulation in prolactin-secreting cells with high density compared with other cell layers. The combined use of Percoll gradient and quantitative in-situ hybridization is a valuable and sensitive method with which to examine prolactin-secreting cell response to a given stimulation. Prolactin-secreting cells with high and low density clearly show functional heterogeneity in their response to dopamine.