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KMID : 1130320080510080879
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Korean Journal of Pediatrics
2008 Volume.51 No. 8 p.879 ~ p.885
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Transforming growth factor-β promoted vascular endothelial growth factor release by human lung fibroblasts
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Park Sang-Uk
Shim Jung-Yeon
Kim Deok-Soo
Jung Hye-Lim
Park Moon-Soo
Shim Jae-Won
Shin Joo-Hwa
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Abstract
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Purpose:The human lung fibroblast may act as an immunomodulatory cell by providing pro-inflammatory cytokines and chemokines, which are important in airway remodeling. Vascular endothelial growth factor (VEGF) induces mucosal edema and angiogenesis. Thymus and activation regulated chemokine (TARC) induces selective migration of T helper 2 cells. We investigated whether human lung fibroblasts produced VEGF and TARC, and the effects were augmented with the co-culture of fibroblasts and human bronchial smooth muscle cells (HBSMC), and whether dexamethasone can inhibit the proliferation and the release of VEGF in lung fibroblasts.
Method: Human lung fibroblasts were cultured with and without HBSMC, growth-arrested in serum-deprived medium, and pretreated with dexamethasone for 16 hours. After 24-hour stimulation with platelet derived growth factor-BB (PDGF-BB) and/or transforming growth factor-beta (TGF-beta), culture supernatant was harvested for assays of VEGF and TARC. Cell proliferation was assayed using BrdU cell proliferation ELISA kit.
Result:1) The release of VEGF was significantly increased after stimulation with TGF-beta, and its release was augmented when co-stimulated with PDGF and TGF-beta. 2) VEGF release induced by PDGF or TGF-beta was inhibited by dexamethasone. 3) There was no synergistic effect on the release of VEGF when human lung fibroblasts were co-cultured with HBSMC. 4) Dexamethasone did not suppress human lung fibroblasts proliferations. 5) Neither TGF-beta nor PDGF induced TARC release from lung fibroblasts.
Conclusions : Human lung fibroblasts may modulate airway remodeling by release of VEGF, but they have no synergistic effects when co-cultured with HBSMC. Dexamethasone suppresses VEGF release, not proliferation of lung fibroblast.
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KEYWORD
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Human lung fibroblast, Transforming growth factor-β, Vascular endothelial growth factor, Thymus and activation regulated chemokine, Dexamethasone
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