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P190A RhoGAP is required for mammary gland development
B M Heckman-Stoddard1, T Vargo-Gogola, M P Herrick
1Cancer Prevention Fellowship Program, Division of Cancer Prevention, National Cancer Institute, Bethesda, MD 20892, USA. heckmanbm@mail.nih.gov
Developmental Biology
|September 28, 2011
Summary
P190A deficiency impairs mammary gland development, disrupting terminal end bud morphology and ductal outgrowth. This Rho GTPase activating protein (GAP) is crucial for both epithelial and stromal functions in mammary gland development.
Area of Science:
- Developmental Biology
- Cell Biology
- Genetics
Background:
- P190A and p190B Rho GTPase activating proteins (GAPs) are essential for nervous system development.
- p190B is known to be required for mammary gland morphogenesis.
- The distinct role of p190A in mammary gland development remained unexplored.
Purpose of the Study:
- To investigate the role of p190A in mammary gland development.
- To examine the effects of p190A deficiency on mammary gland morphogenesis and differentiation.
Main Methods:
- Analysis of mammary gland development in p190A-deficient mice (heterozygous and homozygous).
- In situ hybridization to detect p190A expression.
- Mammary bud transplantation into SCID/Beige mice for homozygous analysis.
- Immunostaining for p63, estrogen receptor, and progesterone receptor.
Main Results:
- p190A deficiency disrupted terminal end bud (TEB) morphology and significantly inhibited ductal outgrowth in homozygous deficient mice.
- Homozygous p190A deletion reduced transplantation take rate of embryonic mammary buds.
- p190A deficiency led to a disrupted myoepithelial cell layer and increased estrogen/progesterone receptor expression.
Conclusions:
- p190A is essential for proper mammary gland development, acting in both epithelial and stromal compartments.
- p190A plays a role in maintaining TEB morphology, ductal outgrowth, and potentially mammary epithelial cell differentiation.
- Defective cell adhesion and myoepithelial layer integrity contribute to developmental defects in p190A-deficient mammary glands.
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