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DDR1 signaling is essential to sustain Stat5 function during lactogenesis
Elena Faraci-Orf1, Catherine McFadden, Wolfgang F Vogel
1Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario M5S 1A8, Canada.
Journal of Cellular Biochemistry
|September 17, 2005
Summary
The collagen receptor DDR1 (discoidin domain receptor 1) is crucial for mammary gland development by integrating extracellular matrix signals with prolactin signaling, ensuring proper lactation.
Area of Science:
- Cell Biology
- Developmental Biology
- Biochemistry
Background:
- Mammary gland development relies on complex interactions between hormones and the extracellular matrix (ECM).
- The precise coordination of these signals, particularly basement membrane cues, remains incompletely understood.
- Understanding these interactions is key to comprehending mammary gland function and potential disruptions.
Purpose of the Study:
- To investigate the role of discoidin domain receptor 1 (DDR1) in integrating ECM-derived signals with the prolactin-driven lactogenic pathway.
- To elucidate how DDR1 influences mammary epithelial cell function during postnatal development and lactation.
- To identify DDR1 as a potential signaling pathway distinct from canonical hormone and cytokine receptors.
Main Methods:
- Utilized HC11 mammary epithelial cells overexpressing DDR1 and compared them to control cells.
- Employed DDR1-null mouse-derived cells to assess the impact of DDR1 deficiency.
- Conducted mammary tissue transplantation experiments in mice to evaluate in vivo function.
- Measured Stat5 phosphorylation and beta-casein gene expression as key indicators of lactogenic signaling.
Main Results:
- DDR1 overexpression enhanced and sustained Stat5 phosphorylation and beta-casein expression upon collagen and prolactin stimulation.
- DDR1-null cells exhibited significantly reduced Stat5 activation and failed to induce beta-casein expression during lactogenic stimulation.
- Mammary tissue transplantation confirmed DDR1's cell-autonomous role in ductal branching and alveologenesis before lactation onset.
Conclusions:
- Discoidin domain receptor 1 (DDR1) acts as a critical mediator, integrating extracellular matrix cues with prolactin signaling in the mammary gland.
- DDR1 signaling is essential for proper mammary gland development, including ductal branching and alveologenesis.
- DDR1 represents a novel, matrix-derived signaling pathway vital for maintaining mammary gland function beyond traditional hormonal pathways.