Combinatorial expression of phenotypes of different cell lineages in the rat and mouse pituitary
- PMID: 15891010
- DOI: 10.1196/annals.1327.010
Combinatorial expression of phenotypes of different cell lineages in the rat and mouse pituitary
Abstract
As studied by single cell RT-PCR of pituitary hormones, we demonstrated that the pituitaries of rats and mice contain a subpopulation of cells that express two or more hormone phenotypes typically belonging to lineages that are branched separately early during embryonic development, such as glycoprotein hormone alpha-subunit (alphaGSU) mRNA + PRL mRNA, alphaGSU mRNA + POMC mRNA, and POMC mRNA + GH or PRL mRNA. GnRH in vitro selectively expands the population of cells coexpressing alphaGSU mRNA + PRL mRNA, and CRH selectively increases the proportion of cells coexpressing alphaGSU mRNA + POMC mRNA. Colocalization of alphaGSU + PRL or alphaGSU + POMC could not be detected by double immunofluorescence. This lineage promiscuity was also observed in the pituitary in vivo.
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