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From the Centre for Cardiopulmonary Biochemistry and Respiratory Medicine,* Royal Free and University College Medical School, University College London, Rayne Institute, London, United Kingdom; Functional Genomics,
Respiratory Medicine and Molecular Hemato-oncology, Sheba Medical Center, Tel-Hashomer, Israel; and the Inflammatory Diseases Unit,
Roche Bioscience, Palo Alto, California
Transforming growth factor-ß1 (TGF-ß1) plays a central role in promoting extracellular matrix protein deposition by promoting the transformation of fibroblasts to myofibroblasts. To gain new insights into the transcriptional programs involved, we profiled human fetal lung fibroblast global gene expression in response to TGF-ß1 up to 24 hours using oligonucleotide microarrays. In this report, we present data for 146 genes that were up-regulated at least twofold at two time points. These genes group into several major functional categories, including genes involved in cytoskeletal reorganization (n = 30), matrix formation (n = 25), metabolism and protein biosynthesis (n = 27), cell signaling (n = 21), proliferation and survival (n = 13), gene transcription (n = 9), and of uncertain function (n = 21). For 80 of these genes, this is the first report that they are TGF-ß1-responsive. The early induction of two members of the inhibitor of differentiation (ID) family of transcriptional regulators, ID1 and ID3, was followed by the up-regulation of a number of genes that are usually expressed by highly differentiated smooth muscle cells, including smooth muscle myosin heavy chain, basic calponin, and smoothelin. These findings were confirmed at the protein level for primary adult lung fibroblasts. ID1 further behaved like a typical immediate-early gene and, unlike ID3, was expressed and induced at the protein level. Immunohistochemical analysis showed that ID1 was highly expressed by (myo)fibroblasts within fibrotic foci in experimentally induced pulmonary fibrosis. ID1 acts as a dominant-negative antagonist of basic helix-loop-helix transcription factors that drive cell lineage commitment and differentiation. These findings have important implications for our understanding of fibroblast transcriptional programming in response to TGF-ß1 during development, oncogenesis, tissue repair, and fibrosis.
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