DIFFERENTIAL PRODUCTION AND REGULATION OF GONADOTROPINS (GTH-I AND GTH-II) IN THE PITUITARY-GLAND OF RAINBOW-TROUT, ONCORHYNCHUS-MYKISS, DURING OVARIAN DEVELOPMENT

被引:120
作者
NAITO, N
HYODO, S
OKUMOTO, N
URANO, A
NAKAI, Y
机构
[1] UNIV TOKYO,OCEAN RES INST,TOKYO 164,JAPAN
[2] NATL RES INST AQUACULTURE,NIKKO BRANCH,NIKKO,JAPAN
关键词
GONADOTROPIN; GONADOTROPIN SUBUNITS; GONADOTROPES; INSITU HYBRIDIZATION; IMMUNOCYTOCHEMISTRY; PITUITARY GLAND; PARS DISTALIS; OOGENESIS; ONCORHYNCHUS-MYKISS (TELEOSTEI);
D O I
10.1007/BF00318586
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
Biosynthesis of salmon gonadotropins, GTH I and GTH II, during ovarian development, were examined by means of in situ hybridization histochemistry and indirect immunocytochemistry. In rainbow trout pituitary glands, expression of GTH I beta- and II beta-subunit genes appeared separately in distinct cells (GTH I- and GTH II-cells), whereas the GTH alpha-subunit gene was expressed in both cell-types. In the GTH I-cells, coordinated increases in GTH alpha and I beta-messenger ribonucleic acids (mRNAs) occurred coincident with the onset of vitellogenesis, indicating active synthesis of GTH I during vitellogenesis. In contrast, in the GTH II-cells, both GTH alpha-and II beta-mRNA signals markedly increased from a later stage of vitellogenesis and persisted throughout oocyte maturation and ovulation, supporting the idea that GTH II is actively synthesized as a maturational GTH. GTH alpha-mRNA levels in the GTH I-cells selectively decreased prior to final oocyte maturation, although I beta-mRNA levels remained elevated, thus suggesting a decline of biosynthesis of GTH I after vitellogenesis. These findings clarify how the synthesis of GTH I and GTH II are coordinated in the piscine pituitary, and indicate that the expression of GTH subunit genes during gametogenesis is regulated differentially in a cell-specific manner, both temporally and spatially.
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页码:457 / 467
页数:11
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