Abstract
Normal adult human dermal fibroblasts grown in a three-dimensional collagen lattice increase mRNA level of collagen receptor integrin subunit α2 (Xu, J., and R.A.F. Clark. 1996. J. Cell Biol. 132:239– 249.) and DNA binding activity of a nuclear transcription factor, NF-κB (Xu, J., and R.A.F. Clark. 1997. J. Cell Biol. 136:473–483.). Here we present evidence that the collagen lattice induced the nuclear translocation of p50, one member of NF-κB family, and the degradation of an NF-κB inhibitor protein, IκB-α. The inhibition of NF-κB activity by SN50, a peptide inhibitor targeted at nuclear translocation of NF-κB, significantly reduced the induction of integrin α2 mRNA and protein by the collagen lattice. A region located between −549 and −351 bp in the promoter of integrin α2 gene conferred the inducibility by three-dimensional collagen lattice. The presence of either SN50 or IκB-α32, 36, a stable mutant of IκB-α, abrogated this inducibility, indicating that the activation of integrin α2 gene expression was possibly mediated by NF-κB through this region. Although there were three DNA–protein binding complexes forming in this region that are sensitive to the inhibition of NF-κB nuclear translocation, NF-κB was not directly present in the binding complexes. Therefore, an indirect regulatory mechanism by NF-κB in integrin α2 gene expression induced by three-dimensional collagen lattice is suggested. The involvement of NF-κB in reorganization and contraction of three-dimensional collagen lattice, a process that requires the presence of abundant integrin α2β1, was also examined. The inhibition of NF-κB activity by SN50 greatly blocked the contraction, suggesting its critical role in not only the induction of integrin α2 gene expression by three- dimensional collagen lattice, but also α2β1-mediated tissue-remodeling process.
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Dates
Type | When |
---|---|
Created | 23 years, 1 month ago (July 26, 2002, 12:47 p.m.) |
Deposited | 2 years, 1 month ago (July 22, 2023, 3:32 a.m.) |
Indexed | 2 months ago (July 1, 2025, 9:48 a.m.) |
Issued | 27 years, 6 months ago (Feb. 9, 1998) |
Published | 27 years, 6 months ago (Feb. 9, 1998) |
Published Online | 27 years, 6 months ago (Feb. 9, 1998) |
Published Print | 27 years, 6 months ago (Feb. 9, 1998) |
@article{Xu_1998, title={A Three-dimensional Collagen Lattice Activates NF-κB in Human Fibroblasts: Role in Integrin α2 Gene Expression and Tissue Remodeling}, volume={140}, ISSN={1540-8140}, url={http://dx.doi.org/10.1083/jcb.140.3.709}, DOI={10.1083/jcb.140.3.709}, number={3}, journal={The Journal of Cell Biology}, publisher={Rockefeller University Press}, author={Xu, Jiahua and Zutter, Mary M. and Santoro, Samuel A. and Clark, Richard A.F.}, year={1998}, month=feb, pages={709–719} }