title: In search of rat stem Leydig cells: identification, isolation, and lineage-specific development.
abstract: Leydig cells (LCs) are thought to differentiate from spindle-shaped precursor cells that exhibit some aspects of differentiated function, including 3beta-hydroxysteroid dehydrogenase (3betaHSD) activity. The precursor cells ultimately derive from undifferentiated stem LCs (SLCs), which are postulated to be present in testes before the onset of precursor cell differentiation. We searched for cells in the neonatal rat testis with the abilities to: (i) proliferate and expand indefinitely in vitro (self renew); (ii) differentiate (i.e., 3betaHSD and ultimately synthesize testosterone); and (iii) when transplanted into host rat testes, colonize the interstitium and subsequently differentiate in vivo. At 1 week postpartum, spindle-shaped cells were seen in the testicular interstitium that differed from the precursor cells in that they were 3betaHSD-negative, luteinizing hormone (LH) receptor (LHR)-negative, and platelet-derived growth factor receptor alpha (PDGFR alpha)-positive. These cells were purified from the testes of 1-week-old rats. The cells contained proteins known to be involved in LC development, including GATA4, c-kit receptor, and leukemia inhibitory factor receptor. The putative SLCs expanded over the course of 6 months while remaining undifferentiated. When treated in media that contained thyroid hormone, insulin-like growth factor I, and LH, 40% of the putative SLCs came to express 3betaHSD and to synthesize testosterone. When transplanted into host rat testes from which LCs had been eliminated, the putative SLCs colonized the interstitium and subsequently expressed 3betaHSD, demonstrating their ability to differentiate in vivo. We conclude that these cells are likely to be the sought-after SLCs.
authors.affiliation: Population Council, 1230 York Avenue, New York, NY 10021, USA.
authors.forename: Ren-Shan
authors.initials: RS
authors.lastname: Ge
authors.forename: Qiang
authors.initials: Q
authors.lastname: Dong
authors.forename: Chantal M
authors.initials: CM
authors.lastname: Sottas
authors.forename: Vassilios
authors.initials: V
authors.lastname: Papadopoulos
authors.forename: Barry R
authors.initials: BR
authors.lastname: Zirkin
authors.forename: Matthew P
authors.initials: MP
authors.lastname: Hardy
mesh_terms: D015096:3-Hydroxysteroid Dehydrogenases / Q000032:analysis / Q000378:metabolism*; D000818:Animals; D002454:Cell Differentiation; D019070:Cell Lineage; D007334:Insulin-Like Growth Factor I / Q000494:pharmacology; D007985:Leydig Cells / Q000737:chemistry / Q000166:cytology* / Q000187:drug effects; D007986:Luteinizing Hormone / Q000494:pharmacology; D008297:Male; D051381:Rats; D020796:Receptor, Platelet-Derived Growth Factor alpha / Q000032:analysis; D011974:Receptors, LH / Q000032:analysis; D033581:Stem Cell Transplantation; D013234:Stem Cells / Q000737:chemistry / Q000166:cytology* / Q000187:drug effects; D013737:Testis / Q000166:cytology; D013963:Thyroid Hormones / Q000494:pharmacology
chemical_list: D011974:Receptors, LH; D013963:Thyroid Hormones; D007334:Insulin-Like Growth Factor I; D007986:Luteinizing Hormone; D015096:3-Hydroxysteroid Dehydrogenases; D020796:Receptor, Platelet-Derived Growth Factor alpha