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Sphingosine 1-Phosphate And Platelet-derived Growth Factor (PDGF) Act Via PDGFβ Receptor-Sphingosine 1-Phosphate Receptor Complexes In Airway Smooth Muscle Cells*

C. Waters, B. Sambi, K. Kong, D. Thompson, S. Pitson, S. Pyne, N. Pyne
Published 2003 · Biology, Medicine

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Platelet-derived growth factor (PDGF) and sphingosine 1-phosphate (S1P) act via PDGFβ receptor-S1P1 receptor complexes in airway smooth muscle cells to promote mitogenic signaling. Several lines of evidence support this conclusion. First, both receptors were co-immunoprecipitated from cell lysates with specific anti-S1P1 antibodies, indicating that they form a complex. Second, treatment of airway smooth muscle cells with PDGF stimulated the phosphorylation of p42/p44 MAPK, and this phosphorylated p42/p44 MAPK associates with the PDGFβ receptor-S1P1 receptor complex. Third, treatment of cells with antisense S1P1receptor plasmid construct reduced the PDGF- and S1P-dependent activation of p42/p44 MAPK. Fourth, S1P and/or PDGF induced the formation of endocytic vesicles containing both PDGFβ receptors and S1P1 receptors, which was required for activation of the p42/p44 MAPK pathway. PDGF does not induce the release of S1P, suggesting the absence of a sequential mechanism. However, sphingosine kinase 1 is constitutively exported from cells and supports activation of p42/p44 MAPK by exogenous sphingosine. Thus, the presentation of sphingosine from other cell types and its conversion to S1P by the kinase exported from airway smooth muscle cells might enable S1P to act with PDGF on the PDGFβ receptor-S1P1 receptor complex to induce biological responses in vivo. These data provide further evidence for a novel mechanism for G-protein-coupled receptor and receptor tyrosine kinase signal integration that is distinct from the transactivation of receptor tyrosine kinases by G-protein-coupled receptor agonists and/or sequential release and action of S1P in response to PDGF.
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