Molecular dissection of the male germ cell lineage identifies putative spermatogonial stem cells in rhesus macaques
Open Access
- 31 March 2009
- journal article
- research article
- Published by Oxford University Press (OUP) in Human Reproduction
- Vol. 24 (7), 1704-1716
- https://doi.org/10.1093/humrep/dep073
Abstract
The spermatogonial stem cell (SSC) pool in the testes of non-human primates is poorly defined. To begin characterizing SSCs in rhesus macaque testes, we employed fluorescence-activated cell sorting (FACS), a xenotransplant bioassay and immunohistochemical methods and correlated our findings with classical descriptions of germ cell nuclear morphology (i.e. A dark and A pale spermatogonia). FACS analysis identified a THY-1 + fraction of rhesus testis cells that was enriched for consensus SSC markers (i.e. PLZF, GFRα1) and exhibited enhanced colonizing activity upon transplantation to nude mouse testes. We observed a substantial conservation of spermatogonial markers from mice to monkeys [PLZF, GFRα1, Neurogenin 3 (NGN3), cKIT]. Assuming that molecular characteristics correlate with function, the pool of putative SSCs (THY-1 + , PLZF + , GFRα1 + , NGN3 +/− , cKIT − ) comprises most A dark and A pale and is considerably larger in primates than in rodents. It is noteworthy that the majority of A dark and A pale share a common molecular phenotype, considering their distinct functional classifications as reserve and renewing stem cells, respectively. NGN3 is absent from A dark , but is expressed by some A pale and may mark the transition from undifferentiated (cKIT − ) to differentiating (cKIT + ) spermatogonia. Finally, the pool of transit-amplifying progenitor spermatogonia (PLZF + , GFRα1 + , NGN3 + , cKIT +/− ) is smaller in primates than in rodents. These results provide an in-depth analysis of molecular characteristics of primate spermatogonia, including SSCs, and lay a foundation for future studies investigating the kinetics of spermatogonial renewal, clonal expansion and differentiation during primate spermatogenesis.Keywords
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