Protein kinase C delta mediates platelet-induced breast cancer cell invasion

The Journal of Pharmacology and Experimental Therapeutics
David Alonso-EscolanoM W Radomski

Abstract

Platelets play an important role in carcinogenesis, but the underlying molecular mechanisms remain poorly understood. To investigate the effects of platelets on in vitro invasion of MCF7 human breast cancer cells, human MCF7 cells were used to study their interactions with platelets using aggregometry and cell invasion chambers. Zymography and quantitative polymerase chain reaction (PCR) were used to study matrix metalloproteinases (MMPs), whereas Western blot was used to study protein kinase C (PKC) delta in MCF7 cells. We observed that platelets promoted invasion of MCF7 cells (3-fold increase, p<0.05, n=3) and that this process correlated with a dramatic increase in MMP-9 (8 fold-increase, p<0.001, n=3), which is known to facilitate cancer cell invasion. Because both platelets and MCF7 cells have been shown to release MMP-9, we investigated the cellular source that accounted for this increase. The time course and the use of specific protein synthesis inhibitors demonstrated that most of the increase in MMP-9 levels derived from de novo synthesis of this protease by cancer cells. Furthermore, platelets activated PKCdelta in MCF7 cells after 1 h of incubation (18.45+/-4.75% increase, p<0.05, n=4-7), which, in turn, led to an u...Continue Reading

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