Selective inhibitors of bromodomain BD1 and BD2 of BET proteins modulate radiation-induced profibrotic fibroblast responses: cancer therapy and prevention
Radiotherapy can induce various adverse effects including fibrosis in cancer patients. Radiation-induced aberrant expression of profibrotic genes has been associated with dysregulated epigenetic mechanisms. Pan-BET (bromodomain and extraterminal domain) inhibitors, such as JQ1 and I-BET151, have bee...
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| Main Authors: | , , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
15 July 2022
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| In: |
International journal of cancer
Year: 2022, Volume: 151, Issue: 2, Pages: 275-286 |
| ISSN: | 1097-0215 |
| DOI: | 10.1002/ijc.33989 |
| Online Access: | Verlag, kostenfrei, Volltext: https://doi.org/10.1002/ijc.33989 Verlag, kostenfrei, Volltext: http://onlinelibrary.wiley.com/doi/abs/10.1002/ijc.33989 
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| Author Notes: | Chun-Shan Liu, Inmaculada Rioja, Ali Bakr, Marlon R. Veldwijk, Elena Sperk, Carsten Herskind, Dieter Weichenhan, Rab K. Prinjha, Christoph Plass, Peter Schmezer, Odilia Popanda |
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| 245 | 1 | 0 | |a Selective inhibitors of bromodomain BD1 and BD2 of BET proteins modulate radiation-induced profibrotic fibroblast responses |b cancer therapy and prevention |c Chun-Shan Liu, Inmaculada Rioja, Ali Bakr, Marlon R. Veldwijk, Elena Sperk, Carsten Herskind, Dieter Weichenhan, Rab K. Prinjha, Christoph Plass, Peter Schmezer, Odilia Popanda |
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| 520 | |a Radiotherapy can induce various adverse effects including fibrosis in cancer patients. Radiation-induced aberrant expression of profibrotic genes has been associated with dysregulated epigenetic mechanisms. Pan-BET (bromodomain and extraterminal domain) inhibitors, such as JQ1 and I-BET151, have been reported to attenuate the profibrotic response after irradiation. Despite their profound preclinical efficacy, the clinical utility of pan-inhibitors is limited due to observed cytotoxicicities. Recently, inhibitors were developed that selectively target the first (BD1) and second (BD2) bromodomain of the BET proteins (iBET-BD1 [GSK778] and iBET-BD2 [GSK046]). Here, their potential to attenuate radiation-induced fibroblast activation with low-toxicity was investigated. Our results indicated that cell proliferation and cell cycle progression in fibroblasts from BJ cells and six donors were reduced when treated with I-BET151 and iBET-BD1, but not with iBET-BD2. After irradiation, induction of DGKA and profibrotic markers, especially COL1A1 and ACTA2, was attenuated with all BET inhibitors. H3K27ac enrichment was similar at the DGKA enhancer region after I-BET151 treatment and irradiation, but was reduced at the COL1A1 transcription start site and the ACTA2 enhancer site. iBET-BD2 did not change H3K27ac levels in these regions. BRD4 occupancy at these regions was not altered by any of the compounds. Cell migration activity was measured as a characteristic independent of extracellular matrix production and was unchanged in fibroblasts after irradiation and BET inhibitor-treatment. In conclusion, iBET-BD2 efficiently suppressed radiation-induced expression of DGKA and profibrotic markers without showing cytotoxicity. Thus BD2-selective targeting is a promising new therapeutic avenue for further investigations to prevent or attenuate radiotherapy-induced fibrosis. | ||
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| 650 | 4 | |a selective bromodomain inhibitors | |
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