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Induction of protein growth factor systems in the ovaries of transgenic mice overexpressing human type 2 lysophosphatidic acid G protein-coupled receptor (LPA2)

Abstract

The lipid growth factor lysophosphatidic acid (LPA) is produced by ovarian cancer cells in quantities sufficient to attain concentrations of up to 10 μ M. An autocrine circuit was demonstrated when ovarian cancer cells, but not normal ovarian surface epithelial cells, were proven to express LPA2 (Edg-4) and LPA3 (Edg-7) G protein-coupled receptors for LPA. Human LPA2 now has been expressed transgenically in C57BL/6 mouse ovaries under direction of the α-inhibin large promoter. Human LPA2 mRNA and protein were detected in all transgenic (TG) mouse ovaries at levels far higher than in other tissues and at least fivefold higher than in cultured lines of human ovarian cancer cells, with the expected sex cord-stromal distribution. Most LPA2 TG ovaries produced significantly higher levels than non-TG ovaries of type A, but not type B, vascular endothelial growth factor (VEGF), isomers of VEGF-A, and urokinase-type plasminogen activator (uPA). Many LPA2 TG ovaries had elevated expression of VEGF receptors 1 and 2, and a depressed level of type 2 PA inhibitor. Thus, the LPA–LPA2 circuit regulates ovarian cells both directly and through increases in protein growth factor systems.

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Acknowledgements

We thank Dr Aaron J Hsueh from Stanford and Dr Ilpo T Huhtaniemi from University of Turku, Finland for the provision of α-inhibin promoter and Dr Steve A Cannistra from Harvard Medical School for the 36M2 ovarian cancer cell lines. This work was supported by Grant # 99-00518V-10265 from the California Cancer Research Program to Edward J Goetzl.

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Correspondence to Edward J Goetzl.

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Huang, MC., Lee, HY., Yeh, CC. et al. Induction of protein growth factor systems in the ovaries of transgenic mice overexpressing human type 2 lysophosphatidic acid G protein-coupled receptor (LPA2). Oncogene 23, 122–129 (2004). https://doi.org/10.1038/sj.onc.1206986

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