Suppression of Prolactin Release in vitro from the Rainbow Trout Pituitary, with Special Reference to the Structural Arrangement of the Pituitary Cells

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概要

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• In teleosts, prolactin (PRL) cells are localized in rostral region of the pars distalis (PD) forming clusters or follicles. The present study was undertaken to examine whether interactions resulting from the arrangement of PRL cells might be involved in the regulation of PRL release. To this end, the release of PRL from the rainbow trout (Oncorhynchus mykiss) and tilapia (Oreochromis mossambicus) was compared under three different conditions of incubation: 1) the organ culture of PRL cells in intact PD; 2) the incubation of individual PD cells that were dispersed and subsequently attached to the culture plate; 3) the incubation of PD cells that had been allowed to aggregate after dispersion. For the trout, PRL release from the dispersed cells was greater than that from either the organ-cultured PD or the cell aggregates. For the tilapia, by contrast, the release of PRL from dispersed cells was similar to that observed during the incubation of either the organ-cultured PD or the cell aggregates. In both the trout and tilapia, growth hormone (GH) cells form clusters in the proximal PD. For both species, the release of GH from the dispersed cells was similar to that from either the organ-cultured PD or the cell aggregates. For the trout, but not the tilapia, it would appear that the close association of PRL cells in pituitary follicles has considerable importance in establishing basal hormone release. The release of newly synthesized (pulse-labeled) PRL from dispersed trout PRL cells was reduced when the incubation medium was conditioned by previous incubation of the trout PD. Nevertheless, the release of newly synthesized PRL was not diminished by the addition of salmon PRL to the incubation medium. Taken together, our findings suggest that, for the trout, the suppression of PRL release from the PD and cell aggregates was mediated through (an) inhibitory factor(s) within the PD other than PRL itself.

• 社団法人日本動物学会の論文
• 1995-04-15

著者

• GRAU E.

  Hawaii Institute of Marine Biology, University of Hawaii

• HIRANO Tetsuya

  Ocean Research Institute, University of Tokyo

• Grau E.

  Hawaii Institute Of Marine Biology

• Grau E.

  Hawaii Institute Of Marine Biology University Of Hawaii

• Yada Takashi

  Ocean Research Institute University Of Tokyo

• Hirano Tetsuya

  Ocean Research Institute University Of Tokyo

• Grau Gordon

  Hawaii Institute Of Marine Biology University Of Hawaii

• Hirano Tetsuya

  Ocean Research Institute University

• Yada Takashi

  Ocean Research Institute, University of Tokyo

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