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Expression of Insulin-like Growth Factor Binding Protein-3 and Regulation of the Insulin-like Growth Factor-I Axis in Pig Testis

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Abstract

The stem cell niche is a complex unit comprising key components, such as the extracellular matrix and various paracrine factors, which regulate the differentiation of adult stem cells. In our previous study, we established pig spermatogonial stem cells (pSSCs) in culture and identified the expression of insulin-like growth factor binding protein-3 (IGFBP-3) in pSSCs. The present study investigated not only the expression of IGFBP-3, but also its possible role in pSSCs. In this study, IGFBP-3-expressing cells responded positively to protein gene product 9.5 (PGP9.5), which is a marker for pig spermatogonia. IGFBP-3 expression was significantly increased in 60-dayold pig testes. Additionally, the expression levels of insulinlike growth factor I (IGF-I) and its receptor (IGF-IR) were observed in pSSCs and pig Sertoli cells (pSCs). Furthermore, IGF-I treatment enhanced the proliferation of pSCs and pSSCs when they were co-cultured. Blocking the IGF-I pathway using a specific IGF-IR inhibitor dramatically reduced the proliferation of pSCs. In addition, when heparan sulfate was used to sequester IGFBP-3 from IGF-I binding, a significant increase in the proliferation of pSCs was observed. Exogenous IGF-I treatment also increased the expression level of IGFBP-3 in cultured pSSCs. Furthermore, pSSCs grew well in IGF-I-treated pSC conditioned media. In summary, IGF-I and IGF-IR signaling are important for the proliferation of pSCs, and the germ cell-derived IGFBP-3 had an inhibitory effect on the mitotic activity of IGF-I in pSCs.

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Correspondence to Kwonho Hong.

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Park, HJ., Lee, WY., Chai, SY. et al. Expression of Insulin-like Growth Factor Binding Protein-3 and Regulation of the Insulin-like Growth Factor-I Axis in Pig Testis. Biotechnol Bioproc E 23, 278–285 (2018). https://doi.org/10.1007/s12257-018-0041-y

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