Proteasomal inhibition after injury prevents fibrosis by modulating TGF-β1signalling
| Autor: | Aaron Zirk, G. R. Scott Budinger, David W. Kamp, Minghua Wu, Manu Jain, Jacob I. Sznajder, Daniela Urich, Moisés Selman, Asish K. Ghosh, Annie Pardo, Leonard H.T. Go, Sergio E. Chiarella, John Varga, Stephanie E. Rivera, Navdeep S. Chandel, Anna P. Lam, Gökhan M. Mutlu |
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| Rok vydání: | 2011 |
| Předmět: |
Pulmonary and Respiratory Medicine
medicine.medical_specialty Pulmonary Fibrosis Drug Evaluation Preclinical Peroxisome proliferator-activated receptor Bleomycin Article Bortezomib Transforming Growth Factor beta1 Mice Idiopathic pulmonary fibrosis chemistry.chemical_compound Fibrosis Internal medicine Pulmonary fibrosis medicine Animals Humans Cells Cultured Skin chemistry.chemical_classification Mice Inbred BALB C Scleroderma Systemic business.industry Interstitial lung disease Fibroblasts medicine.disease Boronic Acids Mice Inbred C57BL PPAR gamma Autocrine Communication Disease Models Animal Endocrinology Gene Expression Regulation chemistry Pyrazines Cancer research Proteasome inhibitor Female business Proteasome Inhibitors Signal Transduction medicine.drug |
| Zdroj: | Thorax. 67:139-146 |
| ISSN: | 1468-3296 0040-6376 |
| Popis: | Background The development of organ fibrosis after injury requires activation of transforming growth factor β 1 which regulates the transcription of profibrotic genes. The systemic administration of a proteasomal inhibitor has been reported to prevent the development of fibrosis in the liver, kidney and bone marrow. It is hypothesised that proteasomal inhibition would prevent lung and skin fibrosis after injury by inhibiting TGF-β 1 -mediated transcription. Methods Bortezomib, a small molecule proteasome inhibitor in widespread clinical use, was administered to mice beginning 7 days after the intratracheal or intradermal administration of bleomycin and lung and skin fibrosis was measured after 21 or 40 days, respectively. To examine the mechanism of this protection, bortezomib was administered to primary normal lung fibroblasts and primary lung and skin fibroblasts obtained from patients with idiopathic pulmonary fibrosis and scleroderma, respectively. Results Bortezomib promoted normal repair and prevented lung and skin fibrosis when administered beginning 7 days after the initiation of bleomycin. In primary human lung fibroblasts from normal individuals and patients with idiopathic pulmonary fibrosis and in skin fibroblasts from a patient with scleroderma, bortezomib inhibited TGF-β 1 -mediated target gene expression by inhibiting transcription induced by activated Smads. An increase in the abundance and activity of the nuclear hormone receptor PPARγ, a repressor of Smad-mediated transcription, contributed to this response. Conclusions Proteasomal inhibition prevents lung and skin fibrosis after injury in part by increasing the abundance and activity of PPARγ. Proteasomal inhibition may offer a novel therapeutic alternative in patients with dysregulated tissue repair and fibrosis. |
| Databáze: | OpenAIRE |
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