The DIABLO Knockout K-562 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population designed to disrupt the DIABLO (SMAC) gene in the K-562 chronic myelogenous leukemia cell line. This product comprises a heterogeneous pool of gene-edited cells, providing a physiologically relevant loss-of-function model that maintains genetic diversity for studying apoptosis and drug resistance.
The K-562 host cell line was established from the pleural effusion of a 53-year-old female with chronic myelogenous leukemia in blast crisis. These BCR-ABL-positive cells exhibit an undifferentiated granulocytic precursor phenotype and are widely utilized as a suspension-adapted model for CML biology, hematopoietic differentiation, and apoptotic signaling studies.
DIABLO functions as a proapoptotic factor that is released from the mitochondrial intermembrane space into the cytosol following apoptotic stimuli such as DNA damage, p53 activation, or death receptor ligation by TRAIL, FasL, or TNF-??. It directly interacts with inhibitor of apoptosis proteins (IAPs)??XIAP, cIAP1, and cIAP2??via their BIR domains, thereby neutralizing their caspase-inhibitory activity. This derepression permits activation of initiator caspase-9 and executioner caspases-3 and -7, propagating the apoptotic signal. Upstream regulators include Bax and Bak, which mediate mitochondrial outer membrane permeabilization, leading to cytochrome c release and APAF1-dependent caspase-9 activation. DIABLO also collaborates with the mitochondrial serine protease HTRA2/Omi and participates in both intrinsic and extrinsic apoptotic cascades.
In the K-562 leukemic context, constitutive BCR-ABL signaling drives cell survival and often upregulates IAPs, contributing to apoptosis resistance. DIABLO knockout in this background allows researchers to dissect the mechanisms by which leukemic cells evade mitochondrial apoptosis and develop chemoresistance. This model is instrumental for evaluating the efficacy of SMAC mimetics and investigating the crosstalk between mitochondrial and death receptor pathways in therapy-resistant leukemia.
Typical research applications include detailed investigation of apoptotic signaling mechanisms, screening for IAP antagonists, and functional studies of DIABLO in chemoresistance. Representative experimental techniques applied to these cells include Western blotting for DIABLO release, caspase-3/7/9 activity assays, Annexin V/PI staining for apoptosis detection, co-immunoprecipitation of DIABLO with XIAP, flow cytometry-based cell death analysis, RT-qPCR, and MTT-based cell viability assays. This polyclonal knockout population serves as a versatile tool for apoptosis research and anti-cancer drug development. For additional information or technical support, please contact Ascent Research.
