Stage-specific embryonic antigen 4 is a membrane marker for enrichment of porcine spermatogonial stem cells.

Andrology
Pengfei ZhangWenxian Zeng

Abstract

Spermatogonial stem cells (SSCs), as tissue-specific stem cells, are capable of both self-renewal and differentiation and supporting the continual and robust spermatogenesis for male fertility. As a rare sub-fraction of undifferentiated spermatogonia, SSCs share most molecular markers with the progenitor spermatogonia. Thus, the heterogeneity of the progenitor cells often obscures the characteristics of stem cells. Distinguishing SSCs from the progenitors is of paramount importance to understand the regulatory mechanisms governing their actions. The present study was designed to reveal that SSEA4 can be a marker for putative porcine SSCs that distinguished it from the progenitors and to build a sorting program for efficient enrichment of porcine SSCs. To explore expression of SSEA4 within the undifferentiated spermatogonial population, we performed co-immunofluorescent staining for SSEA4 and common molecular markers (VASA, DBA, PLZF, c-KIT, and SOX9) in the 7-, 90-, and 150-day-old porcine testicular tissues. SSEA4-positive cells were isolated from the 90-day-old porcine testes by flow cytometry. Immunofluorescent, RNA-sequencing, and transplantation analysis were used to reveal that SSEA4-positive fraction holds the stem cell ...Continue Reading

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