Salmonid pituitary gonadotrophs. II. Ontogeny of GTH I and GTH II cells in the rainbow trout (Salmo gairdneri irideus).
Immunocytochemistry of rainbow trout pituitary gonadotrophs (GTH I- and GTH II-producing cells) during gametogenesis was investigated. GTH I and GTH II were found in distinctly different cells in all stages of reproductive development that were examined. Only GTH I cells were present in trout prior to puberty. GTH II appeared in addition to GTH I coincident with the onset of vitellogenesis and spermatogenesis. Both GTH I and GTH II cells were found in trout at the time of final reproductive maturation, although the number of GTH II cells was greater than that of GTH I cells. These data indicate that GTH I and GTH II are localized in separate cells in the trout pituitary throughout gametogenesis, and that synthesis of GTH I and GTH II varies during reproductive development.
Primate Research Institute, Kyoto University, Aichi, Japan.
M
M
Nozaki
N
N
Naito
P
P
Swanson
W W
WW
Dickhoff
Y
Y
Nakai
K
K
Suzuki
H
H
Kawauchi
D000818:Animals; D002452:Cell Count; D005260:Female; D006065:Gonadotropins, Pituitary / Q000378:metabolism*; D007124:Immunoenzyme Techniques; D008297:Male; D010053:Ovary / Q000254:growth & development; D010902:Pituitary Gland / Q000166:cytology / Q000254:growth & development* / Q000378:metabolism; D012487:Salmonidae / Q000378:metabolism*; D013737:Testis / Q000254:growth & development; D013972:Thyrotropin / Q000032:analysis; D014337:Trout / Q000254:growth & development / Q000378:metabolism*
D006065:Gonadotropins, Pituitary; C057763:gonadotropin- pituitary, beta-subunit I, salmon; D013972:Thyrotropin