期刊
ACTA BIOMATERIALIA
卷 8, 期 7, 页码 2602-2611出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.actbio.2012.03.027
关键词
Integrin; Extracellular matrix; Hydrogel; Cell adhesion; Pulmonary fibrosis
资金
- UCLA Academic Senate Faculty Research Grant
- NSF IGERT: Materials Creation Training Program [(MCTP)-DGE-0654431]
- California Nano-Systems Institute
Peptide crosslinkers containing the sequence C-X-CG (X represents various adhesive peptides) were incorporated into poly(ethylene glycol) (PEG) hydrogel networks with different mechanical properties. Pulmonary fibroblasts (PFs) exhibit increased adhesion to rigid hydrogels modified with X = RGDS, DGEA and IKVAV (0.5 and/or 5 mM) compared with a scrambled control (X = HRPNS). PFs exhibit increased adhesion to softer hydrogels when X = DGEA at low (0.5 mM) peptide concentration. PFs seeded onto hydrogels modified with X = RGDS produce alpha-smooth muscle actin (alpha-SMA), a myofibroblast marker, and form an extensive cytoskeleton with focal adhesions. Decreasing substrate stiffness (achieved through hydrolytic degradation) results in down-regulation of alpha-SMA expression by PFs. Substrate stiffness increases the sensitivity of PFs to exogenously applied transforming growth factor beta (TGF-beta 1); PFs on the most rigid gels (E = 900 kPa) express alpha-SMA when treated with low concentrations of TGF-beta 1 beta 1 ng ml(-1)), while those on less rigid gels (E = 20-60 kPa) do not. These results demonstrate the importance of both mechanical and chemical cues in studying pulmonary fibroblast activation, and establish PEG hydrogels as a viable material for further study of IPF etiology. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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