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ERK5 regulates basic fibroblast growth factor-induced type 1 plasminogen activator inhibitor expression and cell proliferation in lung fibroblasts
- ERK5 regulates basic fibroblast growth factor-induced type 1 plasminogen activator inhibitor expression and cell proliferation in lung fibroblasts
- Han, Jung-Hwa; Hwang, Ae-Rang; Nam, Dae-Hwan; Kim, Suji; Choi, Hyoung Chul; Lim, Jae Hyang; Woo, Chang-Hoon
- Ewha Authors
- SCOPUS Author ID
- Issue Date
- Journal Title
- LIFE SCIENCES
- 0024-3205; 1879-0631
- vol. 135, pp. 1 - 8
- bFGF; ERK5; PAI-1; Fibroblasts; Pulmonary fibrosis
- PERGAMON-ELSEVIER SCIENCE LTD
- SCI; SCIE; SCOPUS
- Aims: bFGF is a potent mitogen of cells associated with fibrosis. Although ERK5 has been reported to play roles in the development of fibrosis, its roles in regulating bFGF-induced fibrotic responses are not understood, especially in lung fibroblasts. The authors investigated the role of ERK5 in bFGF induction of cell proliferation and in induction of PAI-1, a critical regulator of the pathological features of fibrosis, in lung fibroblasts. Main methods: The role played by ERK5 in bFGF-induced PAI-1 expression was elucidated by perturbing the ERK5 signaling pathway using a specific chemical inhibitor and siRNA of ERK5. The effects of ERRS signal perturbation on PAI-1 expression were measured at multiple levels by Q-PCR, immunoblotting, ELISA, and reporter gene analysis. The role of MEF2 in bFGF-induced activation of PAI-1 promoter activity via ERK5 was measured using a biotin-labeled DNA pull-down assay, and the effects of ERK5 on the mitogenic effects of bFGF were assessed using a MIT assay. Key findings: In both primary human lung fibroblast and lung fibroblast cell lines, inhibition of ERK5 blocked bFGF-induced PAI-1 expression at both mRNA and protein levels and inhibited bFGF-induced PAI-1 promoter activity induction by bFGF. Upon stimulation with bFGF, MEF2 directly bound to the consensus sequence of the MEF2 binding site in the PAI-1 promoter. In addition, bFGF-induced PAI-1 up-regulation was inhibited by MEF2 siRNA, and bFGF-induced fibroblast proliferation was blocked by inhibiting ERK5. Significance: This study reveals a novel role for the ERK5-MEF2 cascade, linking bFGF-induced PAI-1 expression and subsequent mitogenic processes in lung fibroblasts. (C) 2015 Elsevier Inc. All rights reserved.
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