Role of decreased levels of lipid phosphate phosphatase-1 in accumulation of lysophosphatidic acid in ovarian cancer

Janos L. Tanyi, Yutaka Hasegawa, Ruth Lapushin, Andrew J. Morris, Judith K. Wolf, Andrew Berchuck, Karen Lu, David I. Smith, Kimberly Kalli, Lynn C. Hartmann, Karen McCune, David Fishman, Russell Broaddus, Kwai W. Cheng, Edward N. Atkinson, Jose M. Yamal, Robert C. Bast, Edward A. Felix, Robert A. Newman, Gordon B. Mills

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69 Scopus citations

Abstract

The levels of lysophosphatidic acid (LPA) are consistently elevated in the ascites of ovarian cancer patients, suggesting that ovarian cancer cells are exposed to an LPA replete environment. LPA stimulates cell proliferation, cell survival, resistance to cisplatin, production and activation of proteases, invasiveness and production of the neovascularizing factors, vascular endothelial growth factor, and interleukin 8. Although ovarian cancer cells can produce LPA, this may not be the major reason for altered LPA levels in ascites. We have demonstrated that the major mechanism of degradation of LPA by ovarian cancer cells is through a lipid phosphate phosphatase (LPP)-like activity. We demonstrate herein that LPP-1 mRNA is decreased in the majority of ovarian cancers. This is recapitulated in ovarian cancer cell lines, where LPP-1 RNA levels are lower than those in normal ovarian epithelium and immortalized ovarian epithelial cells. Introduction of LPP-1 into ovarian cancer cell lines results in increased LPA hydrolysis, which is associated with a marked inhibition of cell proliferation and colony-forming activity and a marked increase in apoptosis. Thus, the LPA-rich environment of the ovarian cancer cell in vivo and the subsequent effects of cellular pathophysiology may be a consequence of both increased LPA production and decreased LPA metabolism by ovarian cancer cells.

Original languageEnglish (US)
Pages (from-to)3534-3545
Number of pages12
JournalClinical Cancer Research
Volume9
Issue number10 I
StatePublished - Oct 1 2003

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ASJC Scopus subject areas

  • Oncology
  • Cancer Research

Cite this

Tanyi, J. L., Hasegawa, Y., Lapushin, R., Morris, A. J., Wolf, J. K., Berchuck, A., Lu, K., Smith, D. I., Kalli, K., Hartmann, L. C., McCune, K., Fishman, D., Broaddus, R., Cheng, K. W., Atkinson, E. N., Yamal, J. M., Bast, R. C., Felix, E. A., Newman, R. A., & Mills, G. B. (2003). Role of decreased levels of lipid phosphate phosphatase-1 in accumulation of lysophosphatidic acid in ovarian cancer. Clinical Cancer Research, 9(10 I), 3534-3545.