Abstract
Spermatogonial stem cells (SSCs) are crucial for maintaining spermatogenesis, studying germ line stem cell biology, and producing transgenic animals. Growth factors, including leukemia inhibitory factor (LIF), epidermal growth factor (EGF), basic fibroblast growth factor (bFGF), and glial cell line-derived neurotrophic factor (GDNF), are essential for in vitro culture of SSCs as well as their self-renewal and maintenance. In this study, we investigated the effects of these growth factors on porcine spermatogonial germ cell (pSGC) colony formation. We determined round alkaline phosphatase (AP)-positive pSGC colonies in the presence and absence of growth factors after 7 days of pSGC culture. EGF was found to be essential to support the formation of AP-positive pSGC colonies. The expression of epidermal growth factor receptor (EGFR) and Erb-B2 receptor tyrosine kinase 2 (ERBB2) was also altered in cultured pSGCs compared to that in feeder cells. We verified the effect of EGF signaling on pSGC colony formation using AG1478 as an EGFR inhibitor and AG879 as an ERBB2 inhibitor. pSGC colonies were observed in low dose AG1478-treated groups with EGF, whereas a high dose of AG1478 suppressed pSGC colony formation. AP-positive colonies were also observed in all AG879-treated groups. Taken together, EGFR and EGF signaling play a critical role in the initiation of colony formation of pSGCs. Our study provides insights into the mechanisms of EGF-mediated colony formation by SGCs derived from porcine testes, and will aid the development of transplantation techniques for the production of transgenic offspring.
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This paper was supported by Konkuk University Researcher Fund in 2019.
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Lee, R., Park, HJ., Lee, WY. et al. Effect of Epidermal Growth Factor on the Colony-formation Ability of Porcine Spermatogonial Germ Cells. Biotechnol Bioproc E 26, 677–687 (2021). https://doi.org/10.1007/s12257-020-0372-3
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DOI: https://doi.org/10.1007/s12257-020-0372-3