Abstract
Transforming growth factor-β (TGF-β)1, 2 and 3 peptide superfamily signaling is not only essential for both prenatal and postnatal lung morphogenesis, but also plays a key role in the pathobiology of bronchopulmonary dysplasia, pulmonary fibrosis and emphysema. The respective null mutations of TGF-β1 reveals its function to protect against lung inflammation, of TGF-β2 in cardiopulmonary morphogenesis and of TGF-β3 in lung and palatal fusion. TGF-β signal transduction is tightly regulated at all levels from ligand bioavailability in the extracellular space to the nucleus. Protease-antiprotease balance, correct final assembly of lung matrix and hence completion of alveolarization are all important normal functions of the TGF-β signaling pathway. The consequences of excess TGF-β signaling depend on the developmental stage of the lung: alveolar hypoplasia and fibrosis in the growing lung, fibrosis in the adult lung. While inflammation can induce excessive TGF-β signaling, lung fibrosis per se is inflammation independent and mediated by excessive TGF-β and Smad3 signaling. Therapeutic manipulation of TGF-β-Smad3 function is therefore a rational target. However, its application to pulmonary medicine will not be easy because of the narrow therapeutic range and many-layered physiological regulation of this pathway.
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Warburton, D., Shi, W., Kolb, M., Gauldie, J. (2008). Transforming Growth Factor-β Peptide Signaling in Pulmonary Development, Bronchopulmonary Dysplasia, Fibrosis, and Emphysema. In: Transforming Growth Factor-β in Cancer Therapy, Volume I. Cancer Drug Discovery and Development. Humana Press. https://doi.org/10.1007/978-1-59745-292-2_39
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DOI: https://doi.org/10.1007/978-1-59745-292-2_39
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