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Developing a mammary gland is a stat affair.

L Hennighausen1, G W Robinson, K U Wagner

  • 1Laboratory of Biochemistry and Metabolism, NIDDK, National Institutes of Health, Bethesda, Maryland 20892-1812, USA. mammary@nih.gov

Journal of Mammary Gland Biology and Neoplasia
|August 10, 2000
PubMed
Summary

Mammary gland development relies on prolactin (PRL) activating the JAK-STAT pathway. This pathway

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Area of Science:

  • Evolutionary biology
  • Developmental biology
  • Endocrinology

Background:

  • Mammary gland evolution is recent, featuring remarkable regenerative capacity.
  • Hormones like progesterone and prolactin (PRL) are crucial for mammary development.
  • Hormonal signaling pathways guide tissue remodeling during reproductive cycles.

Purpose of the Study:

  • To elucidate the molecular mechanisms of mammary gland differentiation.
  • To investigate the role of the JAK-STAT pathway in mammary development.
  • To understand the opposing functions of Stat3 and Stat5 in mammary tissue remodeling.

Main Methods:

  • Utilized gene-deleted mice generated by homologous recombination.
  • Analyzed the JAK-STAT signaling pathway activation by prolactin.
  • Investigated in vivo mammary gland development and lactation.

Main Results:

  • Prolactin (PRL) binding activates the JAK-STAT pathway, driving alveolar proliferation and differentiation.
  • JAK-STAT signaling is essential for adult mammary gland development and lactation.
  • Stat5 promotes alveolar function, while Stat3 is linked to cell death and tissue remodeling.

Conclusions:

  • The JAK-STAT pathway, particularly Stat5 and Stat3, plays a critical role in regulating mammary gland development and cyclical remodeling.
  • Opposing activities of Stat3 and Stat5 control the balance between proliferation and apoptosis in mammary tissue.
  • Understanding these pathways offers insights into the evolutionary adaptation of mammary gland function.

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