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ID 47699
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Author
Kakeya, Tomoshi
Takahashi, Sumio Kaken ID
Abstract
Several reports have indicated that prolactin-secreting cells (PRL cells) are generated from growth hormone-secreting cells (GH cells). We have shown that treatment with a combination of epidermal growth factor (EGF), insulin, and estradiol-17beta (E-2) induces the appearance of PRL cells in pituitary tumor GH3 cells. The aim of the present study was to clarify the involvement of mitosis in the cytogenesis of PRL cells in rat pituitary and GH3 cells. The effects of the treatment with EGF, insulin and E-2 on DNA-replication were studied by detecting the uptake of bromodeoxyuridine (BrdU) into the nucleus. In cultured rat pituitary cells, BrdU-labeled PRL cells were observed irrespective of the hormone treatment. In GH3 cells, BrdU-Iabeled GH cells and mammosomatotrophs (MS cells) were detected; BrdU-labeled PRL cells were not detected, however, when GH3 cells were treated with BrdU for 3 hr and then immediately examined for BrdU-labeling. BrdU-Iabeled PRL cells were found only when GH3 cells treated with BrdU were allowed to grow for another 3 days. This finding suggests that during the additional 3-day culture, BrdU-labeled PRL cells were generated from BrdU-Iabeled cells other than PRL cells. These results indicate that PRL cells are transdifferentiated from GH cells or VIS cells in GH3 cells by a combined treatment with EGF, insulin and E-2, while PRL cells in rat pituitaries are able to proliferate in response to the hormone treatment. Thus, there may be two pathways for cytogenesis of PRL cells the transdifferentiation of GH cells or VIS cells, and a self-duplication of PRL cells.
Keywords
GH3 cells
pituitary
mammosomatotroph
mammotroph
somatotroph
Published Date
2002-07
Publication Title
Zoological Science
Volume
volume19
Issue
issue7
Publisher
Zoological Society of Japan
Publisher Alternative
日本動物学会
Start Page
789
End Page
795
ISSN
0289-0003
NCID
AA10545874
Content Type
Journal Article
language
英語
Copyright Holders
© 2002 Zoological Society of Japan
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publisher
Refereed
True
DOI
PubMed ID
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