Journal
LIFE SCIENCES
Volume 73, Issue 4, Pages 447-459Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0024-3205(03)00312-6
Keywords
leukotactin-1; CCR1; signal transduction; chemokine; ERK; PLC; PKC
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Recently cloned leukotactin-1 (Lkn-1) that belongs to CC chemokine family has not been characterized. To understand the intracellular events following Lkn-1 binding to CCR1, we investigated the activities of signaling molecules in response to Lkn-1 in human osteogenic sarcoma cells expressing CCR1. Lkn-1-stimulated cells showed elevated phosphorylation of extracellular signal-related kinases (ERK1/2) with a distinct time course. ERK activation was peaked in 30 min and 12 h showing biphasic activation of ERK. Pertussis toxin, an inhibitor of G(i)/G(o) protein, and phospholipase C (PLC) inhibitor blocked Lkn-1-induced activation of ERK. Protein kinase Cdelta (PKCdelta) specific inhibitor rottlerin inhibited ERK activation in Lkn-1-stimulated cells. The activities of PLC and PKCdelta were also enhanced by Lkn-1 stimulation. Dominant negative Ras inhibited activation of ERK. Immediate early response genes such as c-fos and c-myc were induced by Lkn-1 stimulation. Lkn-1 affected the cell cycle progression by cyclin D-3 induction. These results suggest that Lkn-1 activates, the ERK pathway by transducing the signal through G(i)/G(o). protein, PLC, PKCdelta and Ras, and it may play a role for cell proliferation, differentiation, and regulation of gene expression for other cellular processes. (C) 2003 Elsevier Science Inc. All rights reserved.
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