title: Immunocytochemical localization of S-100 protein in the hypophysis and saccus vasculosus of the elasmobranchs Mustelus manazo and Scyliorhinus torazame.
abstract: S-100 protein-immunoreactive cells were demonstrated by immunocytochemical procedures in the hypophysis and saccus vasculosus of two species of elasmobranchs (Mustelus manazo and Scyliorhinus torazame). In the saccus vasculosus of M. manazo, immunoreactivity was detectable exclusively in the fibrous portions interposed between the epithelial layer and the blood vessels. In the neurohypophysis, tanycytes and astrocytes of the median eminence were immunostained, but only a few labeled cells were found in the neurointermediate lobe. In S. torazame, the neurohypophysis displayed a similar distribution of immunoreactivity, but there were no labeled cells in the saccus vasculosus. In both species, none of the glandular cells of the hypophysis displayed immunoreactivity. Electron-microscopic examination showed that the immunostained cells in the saccus vasculosus correspond to astrocytes.
authors.affiliation: Department of Biology, School of Dentistry, Nippon Dental University, Niigata, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Chiba
authors.forename: S
authors.initials: S
authors.lastname: Ohnishi
authors.forename: Y
authors.initials: Y
authors.lastname: Honma
mesh_terms: D000818:Animals; D004284:Dogfish / Q000378:metabolism*; D007124:Immunoenzyme Techniques; D007150:Immunohistochemistry; D008854:Microscopy, Electron; D010902:Pituitary Gland / Q000166:cytology / Q000378:metabolism* / Q000648:ultrastructure; D009418:S100 Proteins / Q000378:metabolism*; D012754:Sharks / Q000378:metabolism*
chemical_list: D009418:S100 Proteins