STAT5 deletion in macrophages alters ductal elongation and branching during mammary gland development

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Macrophages are required for proper mammary gland development and maintaining tissue homeostasis. However, the mechanisms by which macrophages regulate this process remain unclear. Here, we identify STAT5 as an important regulator of macrophage function in the developing mammary gland. Analysis of mammary glands from mice with STAT5-deficient macrophages demonstrates delayed ductal elongation, enhanced ductal branching and increased epithelial proliferation. Further analysis reveals that STAT5 deletion in macrophages leads to enhanced expression of proliferative factors such as Cyp19a1/aromatase and IL-6. Mechanistic studies demonstrate that STAT5 binds directly to the Cyp19a1 promoter in macrophages to suppress gene expression and that loss of STAT5 results in enhanced stromal expression of aromatase. Finally, we demonstrate that STAT5 deletion in macrophages cooperates with oncogenic initiation in mammary epithelium to accelerate the formation of estrogen receptor (ER)-positive hyperplasias. These studies establish the importance of STAT5 in macrophages during ductal morphogenesis in the mammary gland and demonstrate that altering STAT5 function in macrophages can affect the development of tissue-specific disease.

Original languageEnglish (US)
Pages (from-to)232-244
Number of pages13
JournalDevelopmental Biology
Volume428
Issue number1
DOIs
StatePublished - Aug 1 2017

Fingerprint

Human Mammary Glands
Macrophages
Aromatase
Morphogenesis
Estrogen Receptors
Hyperplasia
Interleukin-6
Breast
Homeostasis
Epithelium
Gene Expression

Keywords

  • Aromatase
  • Ductal morphogenesis
  • Estrogen
  • Macrophage
  • Mammary gland
  • STAT5

Cite this

STAT5 deletion in macrophages alters ductal elongation and branching during mammary gland development. / Brady, Nicholas J.; Farrar, Michael A; Schwertfeger, Kaylee.

In: Developmental Biology, Vol. 428, No. 1, 01.08.2017, p. 232-244.

Research output: Contribution to journalArticle

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abstract = "Macrophages are required for proper mammary gland development and maintaining tissue homeostasis. However, the mechanisms by which macrophages regulate this process remain unclear. Here, we identify STAT5 as an important regulator of macrophage function in the developing mammary gland. Analysis of mammary glands from mice with STAT5-deficient macrophages demonstrates delayed ductal elongation, enhanced ductal branching and increased epithelial proliferation. Further analysis reveals that STAT5 deletion in macrophages leads to enhanced expression of proliferative factors such as Cyp19a1/aromatase and IL-6. Mechanistic studies demonstrate that STAT5 binds directly to the Cyp19a1 promoter in macrophages to suppress gene expression and that loss of STAT5 results in enhanced stromal expression of aromatase. Finally, we demonstrate that STAT5 deletion in macrophages cooperates with oncogenic initiation in mammary epithelium to accelerate the formation of estrogen receptor (ER)-positive hyperplasias. These studies establish the importance of STAT5 in macrophages during ductal morphogenesis in the mammary gland and demonstrate that altering STAT5 function in macrophages can affect the development of tissue-specific disease.",
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