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Am J Physiol Cell Physiol 278: C612-C618, 2000;
0363-6143/00 $5.00
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Vol. 278, Issue 3, C612-C618, March 2000

Lysophosphatidic acid and sphingosine 1-phosphate stimulate endothelial cell wound healing

Hsinyu Lee, Edward J. Goetzl, and Songzhu An

Department of Medicine, University of California Medical Center, San Francisco, California 94143-0711

Lysophosphatidic acid (LPA) and sphingosine 1-phosphate (S1P) are potent lipid growth factors with similar abilities to stimulate cytoskeleton-based cellular functions. Their effects are mediated by a subfamily of G protein-coupled receptors (GPCRs) encoded by endothelial differentiation genes (edgs). We hypothesize that large quantities of LPA and S1P generated by activated platelets may influence endothelial cell functions. Using an in vitro wound healing assay, we observed that LPA and S1P stimulated closure of wounded monolayers of human umbilical vein endothelial cells and adult bovine aortic endothelial cells, which express LPA receptor Edg2, and S1P receptors Edg1 and Edg3. The two major components of wound healing, cell migration and proliferation, were stimulated individually by both lipids. LPA and S1P also stimulated intracellular Ca2+ mobilization and mitogen-activated protein kinase (MAPK) phosphorylation. Pertussis toxin partially blocked the effects of both lipids on endothelial cell migration, MAPK phosphorylation, and Ca2+ mobilization, implicating Gi/o-coupled Edg receptor signaling in endothelial cells. LPA and S1P did not cross-desensitize each other in Ca2+ responses, suggesting involvement of distinct receptors. Thus LPA and S1P affect endothelial cell functions through signaling pathways activated by distinct GPCRs and may contribute to the healing of wounded vasculatures.

G protein-coupled receptors; proliferation; migration; calcium; mitogen-activated protein kinase


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