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Ontogeny of estrogen receptor (ER) alpha and its co-localization with pituitary hormones in the pituitary gland of chick embryos

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Abstract

Estrogen is involved in regulating the development and hormone secretion of the anterior pituitary gland following its binding to estrogen receptors (ERs) expressed on pituitary cells. However, the pituitary is comprised of several cell types, and to date, there is no data about the specific cell types expressing ERs in embyonic chick pituitary. We therefore followed, by immunohistochemistry, the ontogeny of the pituitary ER alpha (ERα), and the cell types expressing ERα throughout chick embryo development. ERα immunoreacitivity was restricted to the nuclei of pituitary cells. ERα-immunopositive (ERα+) cells were first detected at embryonic day 6.5 (E6.5), after which ERα+ cells were consistently detected throughout the anterior pituitary gland, although the density of ERα+ cells in the caudal lobe of the pars distalis was higher than that in the cephalic lobe. The proportion of ERα+ cells in the pituitary was about 6% at E8.5; expression increased to 22% by E18.5 of gestation, with no additional change until hatching. Double-labeling of ERα and pituitary hormones showed that the dominant cell types expressing ERα were gonadotrophs immunopositive for luteinizing hormone (LH); the proportion of ERα+ cells expressing LH increased throughout gestation and reached approximately 57% at hatching. About 2%–6% of thyroid-stimulating-hormone-immunopositive and 1%–2% prolactin-immunopositive cells expressed ERα at later stages of embryonic development, but no growth-hormone-positive or adrenocorticotropic-hormone-positive cells expressed ERα during the embryonic period. Thus, gonadotrophs are the main cell population expressing ERα in the anterior pituitary gland of chick embryo, and ERα is involved in regulating the development of the pituitary gland and the maturation of the hormone-secreting function.

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Acknowledgements

We thank Prof. P. Sharp (Roslin Institute, UK) for the kind gift of polyclonal anti-chicken PRL primary antibody, and Dr. T. Matozaki (Gunma University, Japan) for the kind gift of polyclonal anti-chicken LH primary antibody. Anti-chicken GH, anti-rat TSH, and anti-human ACTH primary antibodies were obtained through the National Hormone and Peptide Program (NHPP), National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), and Dr. Parlow (NHPP). We also thank Dr. L. R. Berghman (Texas A&M University) for the kind gift of monoclonal anti-chicken LH primary antibody, and Dr. J.A. Proudman (US Department of Agriculture) for help and suggestions. We are also grateful to Professor R. S. Goldstein, Faculty of Life Science, Bar-Ilan University, Israel, for reviewing the English manuscript.

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Correspondence to Sheng Cui.

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This work was supported by grants from the Natural Science Foundation for Outstanding Young Scientists of China (30325034) and the Natural Science Foundation of China (30170693, 30471264).

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Liu, J., Cui, S. Ontogeny of estrogen receptor (ER) alpha and its co-localization with pituitary hormones in the pituitary gland of chick embryos. Cell Tissue Res 320, 235–242 (2005). https://doi.org/10.1007/s00441-004-1051-y

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