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Tumor Biology |
Departments of Surgical Oncology [D. S., J. K., H. Y., Y. O., N. H. T., T. W., H. N.] and Transfusion Medicine [Y. O., N. H. T.], University of Tokyo Graduate School of Medicine, Tokyo 113-8655, Japan, and Department of Physiology, Kanazawa University Graduate School of Medicine, Kanazawa, Ishikawa 920-8640, Japan [Y. T.]
Lysophosphatidic acid (LPA) is a lipid mediator with diverse effects on various cells. Here, we investigated the effects of LPA on human colon carcinoma DLD1 cells. Northern blot analysis revealed that DLD1 highly expressed LPA1/Edg-2 but showed only low expression of LPA2/Edg-4 and no expression of LPA3/Edg-7 at the mRNA level. Western blot analysis revealed that DLD1 cells highly expressed LPA1 at the protein level. Using the Boyden chamber assay, LPA markedly increased DLD1 cell migration at concentrations as low as 10 nM, with maximum stimulation at 100 nM (3.6-fold increase). Checkerboard analysis indicated that LPA stimulated both the chemotactic and chemokinetic migration of DLD1 cells. LPA induced a dose-dependent increase in the proliferation of DLD1 cells (3.2-fold increase at 20 µM). Furthermore, LPA stimulated DLD1 cell adhesion to collagen type I (2.0-fold increase at 10 µM) and also stimulated the secretion of both vascular endothelial growth factor (1.4-fold increase at 20 µM) and interleukin 8 (19-fold increase at 20 µM) by ELISA. In contrast, as for matrix metalloproteinase, LPA had no significant effect on pro-matrix metalloproteinase-2 secretion and its activation, as measured by Western blot analysis. Thus, LPA, at concentrations that are present physiologically, enhanced DLD1 cell migration, proliferation, adhesion, and secretion of angiogenic factors, all of which are crucial for cancer metastasis. In comparison, other human colon carcinoma cells (HT29 and WiDR) exclusively expressed LPA2. LPA enhanced their proliferation and secretion of angiogenic factors, whereas LPA did not enhance migration or adhesion. Our results suggest that LPA acts as a potent stimulator of colon cancer progression, although the binding to LPA1 and LPA2 induces slightly different responses.
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