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Activation of cPLA2 is required for
leukotriene D4-induced proliferation in colon cancer cells.
/ Here we demonstrate, for the first time that in both Int
407 (a non-transformed human intestinal epithelial cell
line) and Caco-2 cells (a human colorectal carcinoma cell
line), cytosolic phospholipase A(2)alpha (cPLA(2)alpha) is
activated and translocates to the nucleus upon LTD(4)
stimulation via a calcium-dependent mechanism that involves
activation of protein kinase C (PKC), and the
mitogen-activated protein kinases ERK1/2 and p38. We also
show with a cPLA(2)alpha promoter luciferase assay, that
LTD(4) induces an increase in the transcriptional activity
of cPLA(2)alpha via activation of cPLA(2)alpha and the
transcription factor NFkappaB. / The present data reveal
that cPLA(2)alpha, an important intracellular signal
activated by inflammatory mediators, is an important
regulator of colon tumor growth.