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p190-B RhoGAP regulates mammary ductal morphogenesis
Geetika Chakravarty1, Darryl Hadsell, William Buitrago
1Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas 77030, USA.
Molecular Endocrinology (Baltimore, Md.)
|March 15, 2003
Summary
p190-B RhoGAP (p190-B) is crucial for mammary ductal morphogenesis and invasion. Its deficiency impairs ductal outgrowth by affecting Cap cell proliferation and insulin-like growth factor (IGF) signaling.
Area of Science:
- Developmental Biology
- Cell Signaling
- Cancer Research
Background:
- p190-B RhoGAP (p190-B) is differentially expressed in mammary terminal end buds (TEBs) and tumors.
- Previous studies suggest p190-B's role in TEB invasion during ductal morphogenesis.
Purpose of the Study:
- To investigate the role of p190-B in mammary ductal morphogenesis and TEB invasion.
- To determine if p190-B deficiency affects mammary development and IGF signaling.
Main Methods:
- Studied mammary development in p190-B-deficient mice (heterozygous and null).
- Assessed ductal outgrowth, Cap cell proliferation, and expression of insulin receptor substrates.
- Utilized mammary anlagen transplantation into Rag1-/- mice to assess cell-autonomous effects.
Main Results:
- p190-B heterozygous mice exhibited decreased ductal outgrowth and Cap cell proliferation.
- Reduced expression of insulin receptor substrates 1 and 2 was observed in TEBs of heterozygous mice.
- Mammary epithelial transplants from p190-B heterozygous and null mice showed significantly reduced outgrowth rates.
Conclusions:
- p190-B plays a critical role in regulating mammary ductal morphogenesis.
- p190-B appears to modulate ductal development, at least partly, through the insulin-like growth factor (IGF) signaling axis.