Selective Inhibition of the Second Bromodomain of BET Family Maintains Anti-Tumor Efficacy and Improves Tolerability
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ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE118247 | GEO | 2020/01/22
REPOSITORIES: GEO
Similar Datasets
Project description:Here we report the discovery of ABBV-744, a first in class, highly potent and selective inhibitor of BET family BD2 domains with drug like properties. RNA-seq analysis revealed that ABBV-744 elicited potent inhibition of AR-dependent transcription without causing broad transcription alterations associated with exposure to pan BET inhibitors.
2019-10-23 | GSE130247 | GEO
Project description:Here we report the discovery of ABBV-744, a first in class, highly potent and selective inhibitor of BET family BD2 domains with drug like properties. RNA-seq analysis revealed that ABBV-744 elicited potent inhibition of AR-dependent transcription without causing broad transcription alterations associated with exposure to pan BET inhibitors.
2019-02-04 | GSE118152 | GEO
Project description:Dual bromodomain BET inhibitors (DbBi) that bind with similar affinities to the first and second bromodomains across BRD2, BRD3, BRD4 and BRDt only displayed modest activity as monotherapy in clinical trials. Thrombocytopenia, closely followed by symptoms characteristic of GI toxicity, have presented as dose limiting adverse events that may prevented escalation to higher dose levels for more robust efficacy. ABBV-744 is a highly selective inhibitor for the second bromodomain (BD2) of the four BET family proteins. In contrast to the broad antiproliferative activities observed with DbBi, ABBV-744 displayed significant antiproliferative activities largely but not exclusively in cancer cell lines derived from AML and androgen receptor (AR) positive prostate cancer. Studies in AML xenograft models demonstrated anti-tumor efficacy for ABBV-744 that was comparable to the pan-BET inhibitor ABBV-075 but with improved tolerability. Enhanced anti-tumor efficacy was also observed with the combination of ABBV-744 and the Bcl-2 inhibitor, venetoclax (ABT-199) compared to monotherapies of either agent alone. These results collectively support the clinical evaluation of ABBV-744 in AML (Clinical Trials.gov identifier: NCT03360006).
2021-01-31 | GSE144326 | GEO
Project description:We comprehensively analyzed the differentially expressed mRNAs (DEmRNAs) and lncRNAs (DElncRNAs) underlying the antitumor functions of BET inhibitors of human HCC cells using RNA sequencing (RNA-Seq). The pan-BET inhibitor ABBV-075 and BD2 specific inhibitor ABBV-744 attenuates the IFNγ-induced inflammatory response. In addition, BD2 inhibitors were predominantly effective in inflammatory response.
2022-05-04 | GSE189376 | GEO
Project description:Competitive inhibitors of acetyl-lysine binding to the bromodomains of the BET (bromodomain and extra terminal) family are being developed for the treatment of solid and heme malignancies. BET family member BRD4 function at enhancers/super-enhancers has been shown to sustain signal-dependent or pathogenic gene expression programs. Here we tested the hypothesis that the transcription factor drivers of castration-resistant prostate cancer (CRPC) clinical progression, including the Androgen Receptor (AR), are critically dependent on BRD4 and thus represent a sensitive solid tumor indication for the BET inhibitor ABBV-075. DHT-stimulated transcription of AR target genes was inhibited by ABBV-075 without significant effect on AR protein expression. Further, ABBV-075 disrupted DHT-stimulated recruitment of BET family member BRD4 to gene regulatory regions co-occupied by AR, including the well-established PSA and TMPRSS2 enhancers. Persistent BET inhibition disrupted the composition and function of AR occupied enhancers as measured by a reduction in AR and H3K27Ac ChIP signal and inhibition of eRNA transcription. ABBV-075 displayed potent anti-proliferative activity in multiple models of resistance to second generation anti-androgens and inhibited the activity of AR-V7 and the AR LBD gain-of-function mutations, F877L and L702H. ABBV-075 was also a potent inhibitor of MYC and the TMPRSS2-ETS fusion protein, important parallel transcription factor drivers of CRPC.
2017-02-21 | GSE86245 | GEO
Project description:We performed RNA sequencing of Calu-3 cells after treatment with the BET-domain inhibitors JQ-1 and ABBV-744 as well as BRD2 CRISPRi knockdown. We also included CRISPRi knockdown of two other validated hit genes from our screen, COMP and ACE2.
2021-01-19 | GSE165025 | GEO
Project description:We tested if Brd2 inhibitor ABBV-744 could reduce SARS-CoV-2 infection in Syrian Hamsters. Three days post-infection, the lungs of hamsters were harvested and subjected to RNA-seq. Infected, but untreated, hamsters showed marked up-regulation of a number of genes including ISGs when compared to uninfected controls. In contrast, hamsters treated with ABBV-744 showed a down-regulation of ISG levels, confirming ABBV-744 activity. Thus, Brd2 inhibition can decrease SARS-CoV-2 infection in Syrian Hamsters.
2021-09-02 | GSE182994 | GEO
Project description:The evolutionarily conserved BET bromodomain family contain a distinctive tandem bromodomain structure that enables their chromatin binding to facilitate transcription. Whilst first-in-class drugsthat equally inhibit both bromodomains have shown pre-clinicaland clinical efficacy in a range of malignant and inflammatory pathologies, the functional contribution of the first (BD1) and second (BD2) bromodomains to these pathologies remains largely unknown. Here we haveexploited detailedstructuralinsights and our extensivemedicinal chemistry capabilities to develop novel compounds that are exquisitely selectivefor either BD1 or BD2 of the BET proteins. Using thesewell characterised domain-specific inhibitors we show that BD1 is required by all BET proteins to associate with chromatin and maintain established malignant transcriptional programs.Therefore, targeting BD1 alone phenocopies the therapeutic effects of current non-selective BET inhibitorsin models of cancer. Whilst steady state gene expression primarily requires BD1,we find that the rapid increase of gene expression effectedby a wide range of inflammatory stimuli requiresboth BD1 and BD2. Moreover, although BRD4 is the principal member required for the maintenance of established gene expression, efficient gene induction also requires BRD2 and BRD3. Selective inhibition of BD2 is effective in perturbing the recruitment of all the BET proteins for stimulated gene expression and consequently small molecule inhibitors of BD2 amelioratethe immunoinflammatory end organ damage seen in models of inflammatory arthritis, psoriasis and hepatitis. Together,these data provide novel biological and functional insights into this family of key transcriptional regulators. Importantly, they also help refine the future therapeutic approach when targeting the BET proteinsin distinct pathologies such as cancer and immuno-inflammation.
2020-06-17 | GSE138209 | GEO
Project description:The evolutionarily conserved BET bromodomain family contain a distinctive tandem bromodomain structure that enables their chromatin binding to facilitate transcription. Whilst first-in-class drugsthat equally inhibit both bromodomains have shown pre-clinicaland clinical efficacy in a range of malignant and inflammatory pathologies, the functional contribution of the first (BD1) and second (BD2) bromodomains to these pathologies remains largely unknown. Here we haveexploited detailedstructuralinsights and our extensivemedicinal chemistry capabilities to develop novel compounds that are exquisitely selectivefor either BD1 or BD2 of the BET proteins. Using thesewell characterised domain-specific inhibitors we show that BD1 is required by all BET proteins to associate with chromatin and maintain established malignant transcriptional programs.Therefore, targeting BD1 alone phenocopies the therapeutic effects of current non-selective BET inhibitorsin models of cancer. Whilst steady state gene expression primarily requires BD1,we find that the rapid increase of gene expression effectedby a wide range of inflammatory stimuli requiresboth BD1 and BD2. Moreover, although BRD4 is the principal member required for the maintenance of established gene expression, efficient gene induction also requires BRD2 and BRD3. Selective inhibition of BD2 is effective in perturbing the recruitment of all the BET proteins for stimulated gene expression and consequently small molecule inhibitors of BD2 amelioratethe immunoinflammatory end organ damage seen in models of inflammatory arthritis, psoriasis and hepatitis. Together,these data provide novel biological and functional insights into this family of key transcriptional regulators. Importantly, they also help refine the future therapeutic approach when targeting the BET proteinsin distinct pathologies such as cancer and immuno-inflammation.
2020-06-17 | GSE138089 | GEO
Project description:The evolutionarily conserved BET bromodomain family contain a distinctive tandem bromodomain structure that enables their chromatin binding to facilitate transcription. Whilst first-in-class drugsthat equally inhibit both bromodomains have shown pre-clinicaland clinical efficacy in a range of malignant and inflammatory pathologies, the functional contribution of the first (BD1) and second (BD2) bromodomains to these pathologies remains largely unknown. Here we haveexploited detailedstructuralinsights and our extensivemedicinal chemistry capabilities to develop novel compounds that are exquisitely selectivefor either BD1 or BD2 of the BET proteins. Using thesewell characterised domain-specific inhibitors we show that BD1 is required by all BET proteins to associate with chromatin and maintain established malignant transcriptional programs.Therefore, targeting BD1 alone phenocopies the therapeutic effects of current non-selective BET inhibitorsin models of cancer. Whilst steady state gene expression primarily requires BD1,we find that the rapid increase of gene expression effectedby a wide range of inflammatory stimuli requiresboth BD1 and BD2. Moreover, although BRD4 is the principal member required for the maintenance of established gene expression, efficient gene induction also requires BRD2 and BRD3. Selective inhibition of BD2 is effective in perturbing the recruitment of all the BET proteins for stimulated gene expression and consequently small molecule inhibitors of BD2 amelioratethe immunoinflammatory end organ damage seen in models of inflammatory arthritis, psoriasis and hepatitis. Together,these data provide novel biological and functional insights into this family of key transcriptional regulators. Importantly, they also help refine the future therapeutic approach when targeting the BET proteinsin distinct pathologies such as cancer and immuno-inflammation.
2020-06-17 | GSE138084 | GEO