Preclinical activity of CPI-0610, a novel small-molecule bromodomain and extra-terminal protein inhibitor in the therapy of multiple myeloma

Inhibition of the bromodomain and extra-terminal (BET) proteins is a promising therapeutic strategy for various hematologic cancers. Previous studies suggest that BET inhibitors constrain tumor cell proliferation and survival mainly through the suppression of MYC transcription and activity. However,...

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Veröffentlicht in:Leukemia 2017-08, Vol.31 (8), p.1760-1769
Hauptverfasser: Siu, K T, Ramachandran, J, Yee, A J, Eda, H, Santo, L, Panaroni, C, Mertz, J A, Sims III, R J, Cooper, M R, Raje, N
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container_end_page 1769
container_issue 8
container_start_page 1760
container_title Leukemia
container_volume 31
creator Siu, K T
Ramachandran, J
Yee, A J
Eda, H
Santo, L
Panaroni, C
Mertz, J A
Sims III, R J
Cooper, M R
Raje, N
description Inhibition of the bromodomain and extra-terminal (BET) proteins is a promising therapeutic strategy for various hematologic cancers. Previous studies suggest that BET inhibitors constrain tumor cell proliferation and survival mainly through the suppression of MYC transcription and activity. However, suppression of the transcription of additional genes also contributes to the antitumor activity of BET inhibitors but is less well understood. Here we examined the therapeutic potential of CPI-0610, a potent BET inhibitor currently undergoing phase I clinical testing, in multiple myeloma (MM). CPI-0610 displays potent cytotoxicity against MM cell lines and patient-derived MM cells through G 1 cell cycle arrest and caspase-dependent apoptosis. CPI-0610-mediated BET inhibition overcomes the protective effects conferred by cytokines and bone marrow stromal cells. We also confirmed the in vivo efficacy of CPI-0610 in a MM xenograft mouse model. Our study found IKZF1 and IRF4 to be among the primary targets of CPI-0610, along with MYC . Given that immunomodulatory drugs (IMiDs) stabilize cereblon and facilitate Ikaros degradation in MM cells, we combined it with CPI-0610. Combination studies of CPI-0610 with IMiDs show in vitro synergism, in part due to concomitant suppression of IKZF1 , IRF4 and MYC , providing a rationale for clinical testing of this drug combination in MM patients.
doi_str_mv 10.1038/leu.2016.355
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Given that immunomodulatory drugs (IMiDs) stabilize cereblon and facilitate Ikaros degradation in MM cells, we combined it with CPI-0610. 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Previous studies suggest that BET inhibitors constrain tumor cell proliferation and survival mainly through the suppression of MYC transcription and activity. However, suppression of the transcription of additional genes also contributes to the antitumor activity of BET inhibitors but is less well understood. Here we examined the therapeutic potential of CPI-0610, a potent BET inhibitor currently undergoing phase I clinical testing, in multiple myeloma (MM). CPI-0610 displays potent cytotoxicity against MM cell lines and patient-derived MM cells through G 1 cell cycle arrest and caspase-dependent apoptosis. CPI-0610-mediated BET inhibition overcomes the protective effects conferred by cytokines and bone marrow stromal cells. We also confirmed the in vivo efficacy of CPI-0610 in a MM xenograft mouse model. Our study found IKZF1 and IRF4 to be among the primary targets of CPI-0610, along with MYC . Given that immunomodulatory drugs (IMiDs) stabilize cereblon and facilitate Ikaros degradation in MM cells, we combined it with CPI-0610. Combination studies of CPI-0610 with IMiDs show in vitro synergism, in part due to concomitant suppression of IKZF1 , IRF4 and MYC , providing a rationale for clinical testing of this drug combination in MM patients.</description><subject>13/2</subject><subject>13/31</subject><subject>38/39</subject><subject>38/77</subject><subject>38/89</subject><subject>45/22</subject><subject>631/67/1059/153</subject><subject>631/67/1990/804</subject><subject>631/92/436/108</subject><subject>64/60</subject><subject>692/308/2778</subject><subject>692/700/565/1436/1437</subject><subject>96/106</subject><subject>96/109</subject><subject>Animals</subject><subject>Anticancer properties</subject><subject>Antimitotic agents</subject><subject>Antineoplastic agents</subject><subject>Antitumor activity</subject><subject>Apoptosis</subject><subject>Benzazepines - pharmacology</subject><subject>Binding proteins</subject><subject>Biocompatibility</subject><subject>Biotechnology</subject><subject>Bone marrow</subject><subject>Cancer Research</subject><subject>Caspase</subject><subject>Cell cycle</subject><subject>Cell proliferation</subject><subject>Cell survival</subject><subject>Critical Care Medicine</subject><subject>Cytokines</subject><subject>Cytotoxicity</subject><subject>Degradation</subject><subject>Drug therapy</subject><subject>Drug therapy, Combination</subject><subject>Drugs</subject><subject>G1 Phase Cell Cycle Checkpoints</subject><subject>Genetic aspects</subject><subject>Health aspects</subject><subject>Hematology</subject><subject>Humans</subject><subject>Ikaros protein</subject><subject>Ikaros Transcription Factor - analysis</subject><subject>Ikaros Transcription Factor - genetics</subject><subject>Immunomodulation</subject><subject>In vitro methods and tests</subject><subject>In vivo methods and tests</subject><subject>Inhibition</subject><subject>Inhibitors</subject><subject>Intensive</subject><subject>Interferon regulatory factor 4</subject><subject>Interferon Regulatory Factors - analysis</subject><subject>Interferon Regulatory Factors - genetics</subject><subject>Internal Medicine</subject><subject>Isoxazoles - pharmacology</subject><subject>Medicine</subject><subject>Medicine &amp; Public Health</subject><subject>Mice</subject><subject>Multiple myeloma</subject><subject>Multiple Myeloma - drug therapy</subject><subject>Multiple Myeloma - pathology</subject><subject>Myc protein</subject><subject>Nuclear Proteins - antagonists &amp; inhibitors</subject><subject>Oncology</subject><subject>original-article</subject><subject>Patients</subject><subject>Protein-Serine-Threonine Kinases - antagonists &amp; inhibitors</subject><subject>Proteins</subject><subject>Proto-Oncogene Proteins c-myc - analysis</subject><subject>Proto-Oncogene Proteins c-myc - genetics</subject><subject>Rodents</subject><subject>Stromal cells</subject><subject>Synergism</subject><subject>Terminal protein</subject><subject>Testing</subject><subject>Toxicity</subject><subject>Transcription</subject><subject>Transcription Factors - antagonists &amp; inhibitors</subject><subject>Tumors</subject><subject>Xenografts</subject><subject>Xenotransplantation</subject><issn>0887-6924</issn><issn>1476-5551</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><recordid>eNp9kl1rFDEUhgdR7Fq981oGBPGis-Zj8jGXZWm1ULAXeh0ymTPdlGSyJpni_gd_tBm3aitFQsgh5znvyQlvVb3GaI0RlR8czGuCMF9Txp5UK9wK3jDG8NNqhaQUDe9Ie1S9SOkGoSXJn1dHRMgOdZSuqh9XEYyzkzXa1dpke2vzvg5jvbm6aBDH6KTW9RRuwdXJa-caHxyY2UHdx-DDELy2U62noYbvOeomQ_R2Klq7GDKUlJ22trc5xBLVeQvLjnr3q4efXba7ouX34IrSy-rZqF2CV3fncfX1_OzL5lNz-fnjxeb0sjGs7XIzGinHloieC4rGdpBdO-pxZAMHRoeuGxD0IGjfEyIBJOoHhjhFhgrAA0aCHlfvD7rlkd9mSFl5mww4pycIc1JYti1lpEWyoG__QW_CHMuASRGOGaOEcfE_CneEYSmEYH-pa-1A2WkM5cfM0lqdctkRySVbOq4focoawFsTJhhtuX9Q8O5ewRa0y9sU3JxtmNJD8OQAmhhSijCqXbRex73CSC1eUsVLavGSKl4q-Ju7oebew_AH_m2eAjQHIJXUdA3x3tSPCf4EuMPRyA</recordid><startdate>20170801</startdate><enddate>20170801</enddate><creator>Siu, K T</creator><creator>Ramachandran, J</creator><creator>Yee, A J</creator><creator>Eda, H</creator><creator>Santo, L</creator><creator>Panaroni, C</creator><creator>Mertz, J A</creator><creator>Sims III, R J</creator><creator>Cooper, M R</creator><creator>Raje, N</creator><general>Nature Publishing Group UK</general><general>Nature Publishing Group</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7QL</scope><scope>7RV</scope><scope>7T5</scope><scope>7T7</scope><scope>7TM</scope><scope>7TO</scope><scope>7U9</scope><scope>7X7</scope><scope>7XB</scope><scope>88E</scope><scope>8AO</scope><scope>8C1</scope><scope>8FD</scope><scope>8FE</scope><scope>8FH</scope><scope>8FI</scope><scope>8FJ</scope><scope>8FK</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BBNVY</scope><scope>BENPR</scope><scope>BHPHI</scope><scope>C1K</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>FR3</scope><scope>FYUFA</scope><scope>GHDGH</scope><scope>GNUQQ</scope><scope>H94</scope><scope>HCIFZ</scope><scope>K9.</scope><scope>KB0</scope><scope>LK8</scope><scope>M0S</scope><scope>M1P</scope><scope>M7N</scope><scope>M7P</scope><scope>NAPCQ</scope><scope>P64</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>7X8</scope></search><sort><creationdate>20170801</creationdate><title>Preclinical activity of CPI-0610, a novel small-molecule bromodomain and extra-terminal protein inhibitor in the therapy of multiple myeloma</title><author>Siu, K T ; 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Previous studies suggest that BET inhibitors constrain tumor cell proliferation and survival mainly through the suppression of MYC transcription and activity. However, suppression of the transcription of additional genes also contributes to the antitumor activity of BET inhibitors but is less well understood. Here we examined the therapeutic potential of CPI-0610, a potent BET inhibitor currently undergoing phase I clinical testing, in multiple myeloma (MM). CPI-0610 displays potent cytotoxicity against MM cell lines and patient-derived MM cells through G 1 cell cycle arrest and caspase-dependent apoptosis. CPI-0610-mediated BET inhibition overcomes the protective effects conferred by cytokines and bone marrow stromal cells. We also confirmed the in vivo efficacy of CPI-0610 in a MM xenograft mouse model. Our study found IKZF1 and IRF4 to be among the primary targets of CPI-0610, along with MYC . Given that immunomodulatory drugs (IMiDs) stabilize cereblon and facilitate Ikaros degradation in MM cells, we combined it with CPI-0610. Combination studies of CPI-0610 with IMiDs show in vitro synergism, in part due to concomitant suppression of IKZF1 , IRF4 and MYC , providing a rationale for clinical testing of this drug combination in MM patients.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><pmid>27890933</pmid><doi>10.1038/leu.2016.355</doi><tpages>10</tpages></addata></record>
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identifier ISSN: 0887-6924
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1476-5551
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subjects 13/2
13/31
38/39
38/77
38/89
45/22
631/67/1059/153
631/67/1990/804
631/92/436/108
64/60
692/308/2778
692/700/565/1436/1437
96/106
96/109
Animals
Anticancer properties
Antimitotic agents
Antineoplastic agents
Antitumor activity
Apoptosis
Benzazepines - pharmacology
Binding proteins
Biocompatibility
Biotechnology
Bone marrow
Cancer Research
Caspase
Cell cycle
Cell proliferation
Cell survival
Critical Care Medicine
Cytokines
Cytotoxicity
Degradation
Drug therapy
Drug therapy, Combination
Drugs
G1 Phase Cell Cycle Checkpoints
Genetic aspects
Health aspects
Hematology
Humans
Ikaros protein
Ikaros Transcription Factor - analysis
Ikaros Transcription Factor - genetics
Immunomodulation
In vitro methods and tests
In vivo methods and tests
Inhibition
Inhibitors
Intensive
Interferon regulatory factor 4
Interferon Regulatory Factors - analysis
Interferon Regulatory Factors - genetics
Internal Medicine
Isoxazoles - pharmacology
Medicine
Medicine & Public Health
Mice
Multiple myeloma
Multiple Myeloma - drug therapy
Multiple Myeloma - pathology
Myc protein
Nuclear Proteins - antagonists & inhibitors
Oncology
original-article
Patients
Protein-Serine-Threonine Kinases - antagonists & inhibitors
Proteins
Proto-Oncogene Proteins c-myc - analysis
Proto-Oncogene Proteins c-myc - genetics
Rodents
Stromal cells
Synergism
Terminal protein
Testing
Toxicity
Transcription
Transcription Factors - antagonists & inhibitors
Tumors
Xenografts
Xenotransplantation
title Preclinical activity of CPI-0610, a novel small-molecule bromodomain and extra-terminal protein inhibitor in the therapy of multiple myeloma
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