Abstract
The pituitary gland is known to express cytokines and their receptors. Interleukin-2 (IL-2) and IL-2 receptor (IL-2R) transcripts and protein products in corticotrophic cells have been previously described. IL-2R were also observed in PRL and GH-producing cells. The synthesis of IL-1 and IL-6 and their receptors by pituitary cells has also been reported. We recently demonstrated that the cytokines in addition to their regulatory effects on anterior pituitary hormone secretion are involved in the autocrine or paracrine regulation of pituitary growth. In the present study we show in normal rat anterior pituitary cells: (a) expression of IL-2Rα chain mRNA, (b) the co-localization of IL-2Rα chain with TSH, FSH and LH-producing cells, (c) the percentage of co-localization of IL-2R with all types of anterior pituitary hormone producing cells: PRL> > > ACTH> > GH> TSH = FSH = LH. (d) that [3H]-thymidine is incorporated into the nucleus of all types of hormoneproducing cells without incorporation into other cell types, following IL-2 and IL-6 stimulation. Our results suggest that IL-2 acts on all types of anterior pituitary hormone-producing cells and, through specific functional receptors on the same or other cells, constitutes, as well as IL-6, an inter or intra-cellular factor involved in the coordinate regulation not only of hormone secretion but also of the proliferation of anterior pituitary hormone-producing cells.
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Arzt, E., Sauer, J., Buric, R. et al. Characterization of Interleukin-2 (IL-2) receptor expression and action of IL-2 and IL-6 on normal anterior pituitary cell growth. Endocr 3, 113–119 (1995). https://doi.org/10.1007/BF02990062
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DOI: https://doi.org/10.1007/BF02990062