title: Immunoexpression of Tyro 3 family receptors--Tyro 3, Axl, and Mer--and their ligand Gas6 in postnatal developing mouse testis.
abstract: Tyro 3 family receptors contain three members-Tyro 3, Axl, and Mer-that are essential regulators of mammalian spermatogenesis. However, their exact expression patterns in testis are unclear. In this study, we examined the localizations of Tyro 3, Axl, Mer, and their ligand Gas6 in postnatal mouse testes by immunohistochemistry. All three members and their ligand were continuously expressed in different testicular cells during postnatal development. Tyro 3 was expressed only in Sertoli cells with a varied distribution during testis development. At day 3 postnatal, Tyro 3 was distributed in overall cytoplasmic membrane and cytoplasm of Sertoli cells. From day 14 to day 35 postnatal, Tyro 3 appeared on Sertoli cell processes toward the adlumenal compartment of seminiferous tubules. A stage-dependent Tyro 3 immunoexpression in Sertoli cells was shown by adulthood testis at day 56 postnatal with higher expression at stages I-VII and lower level at stages IX-XII. Axl showed a similar expression pattern to Tyro 3, except for some immunopositive Leydig cells detected in mature testis. In contrast, immunostaining of Mer was detected mainly in primitive spermatogonia and Leydig cells, whereas a relative weak signal was found in Sertoli cells. Gas6 was strongly expressed in Leydig cells, and a relative weak staining signal was seen in primitive spermatogonia and Sertoli cells. These immunoexpression patterns of Tyro 3 family receptors and ligand in testis provide a basis to further study their functions and mechanisms in regulating mammalian spermatogenesis.
authors.affiliation: Department of Cell Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
authors.forename: Huizhen
authors.initials: H
authors.lastname: Wang
authors.forename: Yongmei
authors.initials: Y
authors.lastname: Chen
authors.forename: Yehua
authors.initials: Y
authors.lastname: Ge
authors.forename: Pengpeng
authors.initials: P
authors.lastname: Ma
authors.forename: Quanhong
authors.initials: Q
authors.lastname: Ma
authors.forename: Jing
authors.initials: J
authors.lastname: Ma
authors.forename: Haikun
authors.initials: H
authors.lastname: Wang
authors.forename: Shepu
authors.initials: S
authors.lastname: Xue
authors.forename: Daishu
authors.initials: D
authors.lastname: Han
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D007150:Immunohistochemistry; D036341:Intercellular Signaling Peptides and Proteins / Q000096:biosynthesis*; D008024:Ligands; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D015513:Oncogene Proteins / Q000096:biosynthesis*; D011518:Proto-Oncogene Proteins / Q000096:biosynthesis*; D020794:Receptor Protein-Tyrosine Kinases / Q000096:biosynthesis*; D013737:Testis / Q000166:cytology / Q000254:growth & development* / Q000378:metabolism*; D013997:Time Factors; D000076202:c-Mer Tyrosine Kinase; D000094963:Axl Receptor Tyrosine Kinase; D000099255:Growth Arrest-Specific Protein 6
chemical_list: D036341:Intercellular Signaling Peptides and Proteins; D008024:Ligands; D015513:Oncogene Proteins; D011518:Proto-Oncogene Proteins; D020794:Receptor Protein-Tyrosine Kinases; D000076202:c-Mer Tyrosine Kinase; D000094963:Axl Receptor Tyrosine Kinase; D000099255:Growth Arrest-Specific Protein 6; C490767:Mertk protein, mouse; C000722290:AXL receptor tyrosine kinase, mouse