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Monocyte activation and migration are crucial events in the development of atherosclerosis and other inflammatory diseases. This study examined the role of protein kinase D (PKD) in monocyte migration. Method and Results- PKD2 is the predominant isoform of PKD expressed in monocytic THP-1 cells and primary human monocytes. Lysophosphatidylcholine (lysoPC), a prominent component of oxidized low-density lipoprotein, induces rapid and marked PKD activation in these cells. Using multiple approaches, including dominant-negative mutants and small interfering RNA knock-down, we found that lysoPC-induced PKD2 activation was required for the activation of both ERK and p38 MAPK. p38 MAPK mediation of lysoPC-induced monocytic cell migration was reported previously; our results reveal that the lysoPC-induced PKD2-p38 pathway controls monocyte migration.

Lysophosphatidylcholine Activates a Novel PKD2-Mediated Signaling Pathway That Controls Monocyte Migration