Up-regulation of polymeric immunoglobulin receptor mRNA in mammary epithelial cells by IFN-γ

As shown in previous in vivo experiment, the amount of polymeric immunoglobulin receptor (pIgR), which mediates the transcytosis of pIgA across epithelial cells, is regulated by lactogenic hormones (PRL and cortisol) during the development of the mammary gland. In the present in vitro study, it appe...

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Bibliographic Details
Published in:Molecular and cellular endocrinology 2002-08, Vol.194 (1), p.95-105
Main Authors: Rincheval-Arnold, A, Belair, L, Cencic, A, Djiane, J
Format: Article
Language:English
Subjects:
Animals
Breast - cytology
Dose-Response Relationship, Drug
Epithelial Cells - drug effects
Epithelial Cells - metabolism
Female
Gamma-interferon
Hormones
Hydrocortisone - pharmacology
Interferon-gamma - genetics
Interferon-gamma - pharmacology
Life Sciences
Mammary gland
Polymeric immunoglobulin receptor
Prolactin - pharmacology
Receptors, Polymeric Immunoglobulin - genetics
RNA, Messenger - analysis
RNA, Messenger - drug effects
Sheep
Transcriptional Activation - drug effects
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Summary:As shown in previous in vivo experiment, the amount of polymeric immunoglobulin receptor (pIgR), which mediates the transcytosis of pIgA across epithelial cells, is regulated by lactogenic hormones (PRL and cortisol) during the development of the mammary gland. In the present in vitro study, it appeared that these hormones were insufficient to induce the strong expression of the gene that we observed in vivo. Several papers have shown that IFN-γ is a strong stimulator of pIgR gene expression in different models. In contrast, nothing is known of the effects of IFN-γ on pIgR gene expression in the mammary gland. We report here that IFN-γ strongly increased pIgR mRNA levels through a direct effect on mammary epithelial cells. We show that IFN-γ activated not only Stat1 but also Stat5 and that expression of the pIgR and IRF-1 genes was strongly correlated following IFN-γ stimulation in mammary epithelial cells. In conclusion, these experiments enabled the analysis of different types of regulation of pIgR gene expression in the mammary gland and suggest possible co-operation between circulating hormones and locally produced cytokines, leading to pIgR gene expression in the mammary gland.
ISSN:0303-7207
1872-8057
0303-7207
DOI:10.1016/S0303-7207(02)00183-1