ABT-199,1257044-40-8,IC-0203927

Venetoclax (ABT-199, GDC-0199) is a selective inhibitor of Bcl-2 with a K i of 0.01 nM in cell-free assays. Compared to Bcl-XL and Bcl-W more than 4800 times more selective, no inhibitory activity against McL-1[1].

ABT-199 cell killing was selective and mechanism dependent, BCL2high status is thus a potential predictive marker for sensitivity to ABT-199[1].BIM binding to BCL2 correlates with ABT-199 response and further showed that knockout of BIM results in decreased ABT-199 sensitivity. Eexpression of B-cell genes as enriched in ABT-199-sensitive myeloma, although no single gene consistently delineated sensitive and resistant cells[4]. In the ABT-199-resistant OCI-AML3 cell line, CXCL12 promoted an increase in the proportion of cells expressing high levels of embryonic stem cell core transcription factors abrogated by CD44 knockdown[7].The T-ALL cell line LOUCY, which shows a transcriptional program related to immature T-ALL, exhibited high in vitro and in vivo sensitivity for ABT-199 in correspondence with high levels of BCL-2. In addition, ABT-199 showed synergistic therapeutic effects with different chemotherapeutic agents[3].When performed a genome-wide CRISPR knockout screen and found that inactivation of genes involved in mitochondrial translation restored sensitivity to ABT-199 in resistant AML cells. Pharmacologic inhibition of mitochondrial protein synthesis with antibiotics that target the ribosome, including tedizolid and doxycycline, effectively overcame ABT-199 resistance[6].

VU661013 is a novel, potent, selective MCL1 inhibitor. VU661013 was safely combined with ABT-199 for synergy in murine models of AML[3].ABT-199 and 5-Aza act synergistically to kill AML cells in vitro and display combinatorial antitumor activity in vivo[5]. Treatment with ABT-199 alone and in combination is well tolerated, with the most common side effects being neutropenia, infection, and gastrointestinal toxic effects[2].