PMID: 15223804Jun 30, 2004Paper

Role of lysophospholipid growth factors in the modulation of aqueous humor outflow facility

Investigative Ophthalmology & Visual Science
Priyatham Sai MettuP Vasantha Rao

Abstract

To investigate the role of lysophospholipid growth factors in the regulation of aqueous humor outflow in the trabecular meshwork (TM). The expression profile of the endothelial differentiation gene (Edg) family of G-protein coupled receptors was determined by RT-PCR of human TM (HTM) cell-derived total RNA and by PCR amplification of HTM cell-derived and tissue-derived cDNA libraries. The effects of lysophosphatidic acid (LPA) and sphingosine-1-phosphate (S1P) on actin cytoskeleton and focal adhesions and on myosin light-chain (MLC) phosphorylation in HTM cells were evaluated by immunofluorescence microscopy and Western blot analysis, respectively. Activation of Rho GTPase in HTM cells was quantified by "pull-down" assays. Mobilization of intracellular calcium in HTM cells was determined using spectrofluorometric digital-imaging microscopy. The effects of LPA and S1P on aqueous humor outflow facility were evaluated by perfusion of enucleated porcine eyes. Each of the receptor isoforms Edg1, -2, -3, and -4 was readily detectable in three of four HTM cell-derived libraries, whereas Edg2 was detectable in the HTM tissue library. LPA (20 microM) and S1P (1 microM) stimulated actin stress fiber and focal adhesion formation, increase...Continue Reading

Citations

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