Abstract
Locus coeruleus (LC) is involved in the LHRH regulation by gonadal steroids. We investigated the expression of progesterone and estrogen receptors (PR; ER) in LC neurons of ERα (αERKO) or ERβ (βERKO) knockout mice, and their wild-type (αWT and βWT). Immunocytochemical studies showed that LC expresses PR and both ERs, although ERβ was more abundant. Estradiol benzoate (EB) decreased ERα-positive cells in WT and βERKO mice, and progesterone caused a further reduction, whereas none of the steroids influenced ERβ expression. ERβ deletion increased ERα while ERα deletion did not alter ERβ expression. In both WT mice, EB increased PR expression, which was diminished by progesterone. These steroid effects were also observed in αERKO animals but to a lesser extent, suggesting that ERα is partially responsible for the estrogenic induction of PR in LC. Steroid effects on PR in βERKO mice were similar to those in the αERKO but to a lesser extent, probably because PR expression was already high in the oil-treated group. This expression seems to be specific of LC neurons, since it was not observed in other areas studied, the preoptic area and ventromedial nucleus of hypothalamus. These findings show that LC in mice expresses αER, βER, and PR, and that a balance between them may be critical for the physiological control of reproductive function.
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Acknowledgments
The authors gratefully acknowledge Dr. Celso R. Franci, for his generous support for the steroid radioimmunoassay and Ms. Sonia M. Zanon Batista for her technical assistance. This study was supported by CAPES and FAPESP (CVH) and NIMH 62147 (SO).
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Helena, C., Gustafsson, JÅ., Korach, K. et al. Effects of estrogen receptor α and β gene deletion on estrogenic induction of progesterone receptors in the locus coeruleus in female mice. Endocr 36, 169–177 (2009). https://doi.org/10.1007/s12020-009-9207-x
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DOI: https://doi.org/10.1007/s12020-009-9207-x