![]() Importantly, inhibition of proteasome enhanced the SNIPER(TACC3)‐induced vacuolization, and the combination treatment of SNIPER(TACC3) and bortezomib exhibited a synergistic anticancer activity in several cancer cell lines. Mechanistic analysis suggests that accumulation of ubiquitylated protein aggregates that requires X‐linked inhibitor of apoptosis protein (XIAP) induces ER stress, which results in ER‐stress responses involving X‐box binding protein‐1 (XBP‐1) and ER‐derived vacuolization in cancer cells. In this study, we found that SNIPER(TACC3) induces cytoplasmic vacuolization derived from endoplasmic reticulum (ER) and paraptosis‐like cell death selectively in cancer cells. We previously developed a hybrid small molecule SNIPER (Specific and Nongenetic IAP‐dependent Protein ERaser) against transforming acidic coiled‐coil‐3 (TACC3), SNIPER(TACC3), that induces proteasomal degradation of TACC3 protein.
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