Platelet aggregation induced by Caco-2 cells: regulation by matrix metalloproteinase-2 and adenosine diphosphate
Item Type:Journal Article
Citation:Medina, C., Jurasz, P., Santos-Martinez, M.J., Jeong, S.S., Mitzky, R., Chen, R., Radomski, M.W., Platelet aggregation induced by Caco-2 cells: regulation by matrix metalloproteinase-2 and adenosine diphosphate, Journal of Pharmacology and Experimental Therapeutics, 317, 2, 2006, 739, 745
Caco2-TCIPA.pdf (PDF) 341.9Kb
Formation of tumor cell-platelet aggregates facilitates hematogenous metastases. However, molecular mechanisms implicated in tumor cell-induced platelet aggregation (TCIPA) in colon cancer are unclear. To investigate mechanisms of TCIPA induced by colon adenocarcinoma cells in vitro, human Caco-2 cells were used to study their interactions with platelets using aggregometry, zymography, phase-contrast microscopy, and flow cytometry. Caco-2-induced platelet aggregation in a concentration-dependent manner. This aggregation resulted in the release of matrix metalloproteinase (MMP)-2, as measured by zymography. In addition, flow cytometry showed a significant up-regulation of activated GpIIb/IIIa, total GpIIb/IIIa, GpIb, and P-selectin receptors on platelets. Inhibition of MMP-2 by phenantroline and degradation of ADP by APT102, respectively, resulted in inhibition of TCIPA. Furthermore, both phenantroline and APT102 significantly down-regulated the surface abundance of platelet receptors. Caco-2 cells aggregate platelets, at least in part, via releasing MMP-2 and ADP. Modulation of MMP-2 and ADP actions could have therapeutic value in colonic cancer.
Type of material:Journal Article
Series/Report no:Journal of Pharmacology and Experimental Therapeutics;
Availability:Full text available