title: An ultrastructural study of testes permeability in sea urchins, Strongylocentrotus intermedius.
abstract: Permeability of testes in sea urchins, Strongylocentrotus intermedius, was investigated by using an electron-opaque tracer, lanthanum nitrate. This tracer is able to enter the basal compartment of germinative epithelium, where developing germ cells are located. However, its ability to penetrate the gonadal lumen was reduced. An incomplete permeability barrier between the basal compartment and the gonadal lumen is supposed to exist in testes of S. intermedius.
authors.affiliation: A.V. Zhirmunsky Institute of Marine Biology, Far Eastern Branch of the Russian Academy of Sciences, 17 Palchevskogo str., Vladivostok 690041, Russia. Electronic address: akalachev@imb.dvo.ru.
authors.forename: Alexander V
authors.initials: AV
authors.lastname: Kalachev
mesh_terms: D000818:Animals; D007811:Lanthanum / Q000032:analysis; D008297:Male; D046529:Microscopy, Electron, Transmission; D010539:Permeability; D013194:Staining and Labeling; D047269:Strongylocentrotus / Q000502:physiology* / Q000648:ultrastructure*; D013737:Testis / Q000502:physiology / Q000648:ultrastructure
chemical_list: C016534:lanthanide nitrate; D007811:Lanthanum
keywords: Blood–testis barrier; Lanthanum nitrate; Permeability barrier; Sea urchins; Spermatogenesis; Strongylocentrotus intermedius