Published in:
Open Access
01-12-2015 | Research article
SDF-1alpha concentration dependent modulation of RhoA and Rac1 modifies breast cancer and stromal cells interaction
Authors:
Jennifer Pasquier, Nadine Abu-Kaoud, Houari Abdesselem, Aisha Madani, Jessica Hoarau-Véchot, Hamda Al. Thawadi, Fabien Vidal, Bettina Couderc, Gilles Favre, Arash Rafii
Published in:
BMC Cancer
|
Issue 1/2015
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Abstract
Background
The interaction of SDF-1alpha with its receptor CXCR4 plays a role in the occurrence of distant metastasis in many solid tumors. This interaction increases migration from primary sites as well as homing at distant sites.
Methods
Here we investigated how SDF-1α could modulate both migration and adhesion of cancer cells through the modulation of RhoGTPases.
Results
We show that different concentrations of SDF-1α modulate the balance of adhesion and migration in cancer cells. Increased migration was obtained at 50 and 100 ng/ml of SDF-1α; however migration was reduced at 200 ng/ml. The adhesion between breast cancer cells and BMHC was significantly increased by SDF-1α treatment at 200 ng/ml and reduced using a blocking monoclonal antibody against CXCR4. We showed that at low SDF-1α concentration, RhoA was activated and overexpressed, while at high concentration Rac1 was promoting SDF-1α mediating-cell adhesion.
Conclusion
We conclude that SDF-1α concentration modulates migration and adhesion of breast cancer cells, by controlling expression and activation of RhoGTPases.