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Expression and localization of growth hormone and its receptors in the chicken ovary during sexual maturation

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Abstract

Roles of pituitary growth hormone (GH) in female reproduction are well established. Autocrine and/or paracrine actions of GH in the mammalian ovary have additionally been proposed, although whether the ovary is an extra-pituitary site of GH expression in the laying hen is uncertain. This possibility has therefore been assessed in the ovaries of Hy-Line hens before (between 10–16 weeks of age) and after (week 17) the onset of egg laying. Reverse transcription/polymerase chain reaction (RT-PCR) analysis has consistently detected a full-length (690 bp) pituitary GH cDNA in ovarian stroma from 10 weeks of age, although GH expression is far lower than that in the pituitary gland or hypothalamus. GH mRNA is also present in small (>1–4 mm diameter) follicles after their ontogenetic appearance at 14 weeks of age and in all other developing follicles after 16 weeks of age (>4–30 mm diameter). Immunoreactivity for GH is similarly present in the ovarian stroma from 10 weeks of age and in small (<4 mm diameter) and large (>4–30 mm) follicles from 14 and 16 weeks of age, respectively. The relative intensity of GH staining in the ovarian follicles is consistently greater in the granulosa cells than in the thecal cells and is comparable with that in the follicular epithelium. A 321-bp fragment of GH receptor (GHR) cDNA, coding for the intracellular domain of the receptor, has also been detected by RT-PCR in the ovary and is present in stromal tissue by 10 weeks of age, in small follicles (<4 mm diameter) by 14 weeks of age, and in larger follicles (>4–30 mm diameter) from 16 weeks. GHR immunoreactivity has similarly been detected, like GH, in the developing ovary and in all follicles and is more intense in granulosa cells than in the theca interna or externa. The expression and location of the GH gene therefore parallels that of the GHR gene during ovarian development in the laying hen, as does the appearance of GH and GHR immunoreactivity. These results support the possibility that GH has autocrine and/or paracrine actions in ovarian function prior to and after the onset of lay in hens.

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Acknowledgements

The authors thank Ms. Grażyna Dąbrowska, Ms. Maria Ogórek, and Ms. Barbara Witkowska from the Agricultural University of Krakow for technical help during experiments and Dr. Agnieszka Grzegorzewska for help with the RT-PCR analysis.

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Correspondence to Anna Hrabia.

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This study was supported by grant no. 2 P06D 034 28 from the Ministry of Education and Science, Poland (to A.H.) and, in part, by a Discovery Grant from NSERC (to S.H.).

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Hrabia, A., Paczoska-Eliasiewicz, H.E., Berghman, L.R. et al. Expression and localization of growth hormone and its receptors in the chicken ovary during sexual maturation. Cell Tissue Res 332, 317–328 (2008). https://doi.org/10.1007/s00441-008-0595-7

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