title: Sites of lanthanum occlusion in the testis of the crayfish Procambarus paeninsulanus (Crustacea: Cambaridae).
abstract: The presence of stage-dependent occlusive junctions between adjacent Sertoli cells in the seminiferous epithelium of the crayfish testis was demonstrated by a lanthanum tracer study. The germinal epithelium did not appear to be compartmentalized, as evidenced by access of lanthanum to spermatogonia, spermatocytes, and spermatids. During late spermiogenesis, when encapsulated stage VI spermatids were concentrated in the center of an acinus, lanthanum was excluded apically, coincident with lumen formation. This is the first study examining occluding junctions using a barrier penetration method in the testis of a crustacean.
authors.affiliation: Department of Biology, University of South Florida, Tampa 33620, USA. mharvey@dellnet.com
authors.forename: M C
authors.initials: MC
authors.lastname: Harvey
authors.forename: G W
authors.initials: GW
authors.lastname: Hinsch
authors.forename: D F
authors.initials: DF
authors.lastname: Cameron
mesh_terms: D000818:Animals; D003400:Astacoidea / Q000033:anatomy & histology / Q000254:growth & development* / Q000502:physiology; D001814:Blood-Testis Barrier; D002451:Cell Compartmentation; D007365:Intercellular Junctions / Q000648:ultrastructure; D007811:Lanthanum / Q000032:analysis; D008297:Male; D013091:Spermatogenesis; D013737:Testis / Q000254:growth & development / Q000502:physiology / Q000648:ultrastructure*
chemical_list: D007811:Lanthanum