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Protein tyrosine phosphatase 1B restrains mammary alveologenesis and secretory differentiation

Milani, E. S., Brinkhaus, H., Dueggeli, R., Klebba, I., Mueller, U., Stadler, M., Kohler, H., Smalley, Matthew John ORCID: and Bentires-Alj, M. 2012. Protein tyrosine phosphatase 1B restrains mammary alveologenesis and secretory differentiation. Development 140 (1) , pp. 117-125. 10.1242/dev.082941

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Tyrosine phosphorylation plays a fundamental role in mammary gland development. However, the role of specific tyrosine phosphatases in controlling mammary cell fate remains ill defined. We have identified protein tyrosine phosphatase 1B (PTP1B) as an essential regulator of alveologenesis and lactogenesis. PTP1B depletion increased the number of luminal mammary progenitors in nulliparous mice, leading to enhanced alveoli formation upon pregnancy. Mechanistically, Ptp1b deletion enhanced the expression of progesterone receptor and phosphorylation of Stat5, two key regulators of alveologenesis. Furthermore, glands from Ptp1b knockout mice exhibited increased expression of milk proteins during pregnancy due to enhanced Stat5 activation. These findings reveal that PTP1B constrains the number of mammary progenitors and thus prevents inappropriate onset of alveologenesis in early pregnancy. Moreover, PTP1B restrains the expression of milk proteins during pregnancy and thus prevents premature lactogenesis. Our work has implications for breast tumorigenesis because Ptp1b deletion has been shown to prevent or delay the onset of mammary tumors.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
European Cancer Stem Cell Research Institute (ECSCRI)
Subjects: Q Science > QH Natural history > QH301 Biology
R Medicine > RC Internal medicine > RC0254 Neoplasms. Tumors. Oncology (including Cancer)
Publisher: Company of Biologists
ISSN: 0950-1991
Last Modified: 24 Oct 2022 11:58

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