title: Developmental appearance of the Ca2+-binding proteins parvalbumin, calbindin D-28K, S-100 proteins and calmodulin during testicular development in the rat.
abstract: Calcium and intracellular Ca2+-binding proteins are possibly involved in hormone production and spermatogenesis in rat testis. Parvalbumin, calbindin D-28K, S-100 proteins and calmodulin were localized in the Leydig cells, which are sites of testosterone synthesis. Only the appearance of parvalbumin-immunoreactivity is closely correlated to testosterone production during development of the testes. Calbindin D-28K-immunoreactivity persisted in foetal-type Leydig cells and in adult-type Leydig cells at all stages of development. S-100-immunoreactivity was low during all foetal stages, absent between birth and puberty, and increased thereafter. Calmodulin staining is most prominent in the cytoplasm of developing spermatocytes and of maturing spermatids. All four proteins co-exist in the seminiferous tubules. The distinct localization and developmental appearance of these proteins suggests different regulatory roles in Leydig cell function and spermatogenesis.
authors: Institute of Pharmacology and Biochemistry, University of Zürich-Irchel, Schwitzerland.
authors: U
authors: U
authors: Kägi
authors: J G
authors: JG
authors: Chafouleas
authors: A W
authors: AW
authors: Norman
authors: C W
authors: CW
authors: Heizmann
mesh_terms: D000818:Animals; D064026:Calbindins; D002118:Calcium / Q000378:metabolism*; D002147:Calmodulin / Q000032:analysis / Q000378:metabolism* / Q000502:physiology; D007150:Immunohistochemistry; D008297:Male; D009124:Muscle Proteins / Q000378:metabolism*; D010320:Parvalbumins / Q000032:analysis / Q000378:metabolism* / Q000502:physiology; D011485:Protein Binding; D064030:S100 Calcium Binding Protein G / Q000032:analysis / Q000378:metabolism* / Q000502:physiology; D009418:S100 Proteins / Q000032:analysis / Q000378:metabolism* / Q000502:physiology; D013737:Testis / Q000032:analysis* / Q000166:cytology / Q000196:embryology / Q000502:physiology
chemical_list: D064026:Calbindins; D002147:Calmodulin; D009124:Muscle Proteins; D010320:Parvalbumins; D064030:S100 Calcium Binding Protein G; D009418:S100 Proteins; D002118:Calcium