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Epimorphin functions as a key morphoregulator for mammary epithelial cells
1Life Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA. yhirai@lbl.gov
The Journal of Cell Biology
|February 14, 1998
Summary
Epimorphin is the main driver of mammary gland branching morphogenesis, a process crucial for development. Growth factors are also essential for sufficient cell proliferation to observe this branching.
Area of Science:
- Developmental Biology
- Cell Biology
- Biochemistry
Background:
- Branching morphogenesis is vital for mammary gland development.
- Hepatocyte growth factor (HGF) and EGF were previously thought to be primary drivers.
Purpose of the Study:
- To identify the primary morphogen responsible for mammary gland branching.
- To elucidate the role of epimorphin in mammary epithelial cell morphogenesis.
Main Methods:
- In vivo and in vitro culture of mammary epithelial cells.
- Use of recombinant epimorphin and antibodies for functional studies.
- Analysis of epimorphin expression and localization.
Main Results:
- Epimorphin, not HGF or EGF, is the primary factor inducing branching morphogenesis.
- Epimorphin-dependent branching requires sufficient cell proliferation stimulated by growth factors.
- The presentation of epimorphin influences the morphogenetic outcome, with nonpolar presentation leading to alveoli-like structures.
Conclusions:
- Epimorphin acts as the key morphogen in mammary gland development.
- Growth factors are necessary for achieving the cell numbers required for observable morphogenesis.
- Epimorphin's mode of action is context-dependent, influencing ductal vs. alveolar structures.