Department of Radiation Oncology, Stanford University School of Medicine, 269 Campus Drive, Stanford, CA 94305, USA.
Blood. 2011 Jan 27;117(4):1311-4. doi: 10.1182/blood-2010-08-303099. Epub 2010 Nov 16.
Activation of the adaptive Ire1-XBP1 pathway has been identified in many solid tumors and hematologic malignancies, including multiple myeloma (MM). Here, we report the identification of STF-083010, a novel small-molecule inhibitor of Ire1. STF-083010 inhibited Ire1 endonuclease activity, without affecting its kinase activity, after endoplasmic reticulum stress both in vitro and in vivo. Treatment with STF-083010 showed significant antimyeloma activity in model human MM xenografts. Similarly, STF-083010 was preferentially toxic to freshly isolated human CD138(+) MM cells compared with other similarly isolated cell populations. The identification of this novel Ire1 inhibitor supports the hypothesis that the Ire1-XBP1 axis is a promising target for anticancer therapy, especially in the context of MM.
适应性 Ire1-XBP1 通路的激活已在许多实体瘤和血液恶性肿瘤中被鉴定出来,包括多发性骨髓瘤 (MM)。在这里,我们报告了 STF-083010 的鉴定,这是一种新型的 Ire1 小分子抑制剂。STF-083010 在体外和体内均能抑制内质网应激后 Ire1 内切酶活性,而不影响其激酶活性。STF-083010 的治疗在模型人 MM 异种移植物中显示出显著的抗骨髓瘤活性。同样,与其他类似分离的细胞群相比,STF-083010 对新鲜分离的人 CD138(+) MM 细胞具有优先的毒性。这种新型 Ire1 抑制剂的鉴定支持了 Ire1-XBP1 轴是一种很有前途的抗癌治疗靶点的假设,特别是在 MM 的背景下。