MSA-2 是一种口服非核苷酸 STING 激动剂，以具有纳摩尔亲和力的非共价二聚体形式与 STING 结合。MSA-2 对人的 STING 亚型 WT 和 HAQ 的 EC₅₀ 分别为 8.3 和 24 μM。MSA-2 在同基因小鼠肿瘤模型中显示抗肿瘤活性，刺激肿瘤分泌干扰素-β，诱导肿瘤消退，具有持久的抗肿瘤免疫，并与抗 PD-1 协同作用。

MSA-2, a potent and orally available non-nucleotide STING agonist, is bound to STING as a noncovalent dimer with nanomolar affinity. MSA-2 shows EC 50 s of 8.3 and 24 μM for human STING isoforms WT and HAQ, respectively. MSA-2 stimulates interferon-β secretion in tumors, induces tumor regression with durable antitumor immunity, and synergizes with anti-PD-1 in syngeneic mouse tumor models.

Solid

MSA-2 dosed via either PO or SC regimens achieved comparable exposure in both tumor and plasma. MSA-2 also exhibits dose-dependent antitumor activity when administered by IT, SC, or PO routes, and dosing regimens were identified that induced complete tumor regressions in 80 to 100% of treated animals.
MSA-2 (PO: 60 mg/kg or SC: 50 mg/kg; single dose) that effectively inhibits tumor growth induced substantial elevations of IFN-β, interleukin-6 (IL-6), and TNF-α in tumor. has not independently confirmed the accuracy of these methods. They are for reference only.

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[1]. Pan BS, et al. An orally available non-nucleotide STING agonist with antitumor activity. Science. 2020;369(6506):eaba6098.
[2]. Liu J, et al. Identification of MSA-2: An oral antitumor non-nucleotide STING agonist. Signal Transduct Target Ther. 2021;6(1):18. Published 2021 Jan 12.

In Vitro: DMSO : 50 mg/mL (169.88 mM; Need ultrasonic)配制储备液