M3258 是一种口服生物利用度高、有效、可逆、高选择性的免疫蛋白酶体亚单位 LMP7 (β5i) 抑制剂。M3258 对 LMP7 的 IC₅₀ 为 3.6 nM，在细胞中 IC₅₀ 为 3.4 nM。M3258 在多发性骨髓瘤异种移植模型中显示出很强的抗肿瘤作用。在多发性骨髓瘤细胞中，M3258 导致肿瘤 LMP7 活性和泛素化蛋白转换的显著且持久的抑制以及诱导凋亡 (apoptosis)。

M3258 is an orally bioavailable, potent, reversible and highly selective immunoproteasome subunit LMP7 (β5i) inhibitor. M3258 exerts high biochemical (IC 50 =3.6 nM) and cellular (IC 50 =3.4 nM) potency against the LMP7 subunit. M3258 shows strong antitumor efficacy in multiple myeloma xenograft models. M3258 leads to a significant and prolonged suppression of tumor LMP7 activity and ubiquitinated protein turnover and the induction of apoptosis in multiple myeloma cells.

Solid

LMP7

M3258 inhibits human LMP7 with a mean IC50 of 4.1 nM. M3258 displays weak activity against the constitutive proteasome subunit β5 (mean IC50=2519 nM). M3258 potently inhibits LMP7 in the human multiple myeloma cell lines MM.1S and U266B1 and in human, rat, and dog PBMCs with IC50s between 2 and 37 nM.
M3258 induces a >four fold accumulation of ubiquitinated proteins with an EC50 of 1980 nM in MM.1S cells. M3258 interferes with immunoproteasome function. M3258 also induces apoptosis assessed by caspase 3/7 activity (EC50=420 nM;>3.5-fold induction) and reduces MM.1S cell viability (IC50=367 nM). has not independently confirmed the accuracy of these methods. They are for reference only.

M3258 (1 mg/kg; 10 mg/kg) shows superior antitumor efficacy in selected multiple myeloma and mantle cell lymphoma xenograft models compared with the approved nonselective proteasome inhibitors bortezomib and ixazomib. has not independently confirmed the accuracy of these methods. They are for reference only. Animal Model:

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Powder -20°C 3 years；4°C 2 years

[1]. Klein M, et al. Structure-Based Optimization and Discovery of M3258, a Specific Inhibitor of the Immunoproteasome Subunit LMP7 (β5i) [published online ahead of print, 2021 Jul 6]. J Med Chem. 2021;10.1021/acs.jmedchem.1c00604.
[2]. Sanderson MP, et al. M3258 Is a Selective Inhibitor of the Immunoproteasome Subunit LMP7 (β5i) Delivering Efficacy in Multiple Myeloma Models [published online ahead of print, 2021 May 27]. Mol Cancer Ther. 2021;10.1158/1535-7163.MCT-21-0005.

In Vitro: DMSO : 250 mg/mL (759.51 mM; Need ultrasonic)配制储备液