Laflunimus (HR325) 是一种免疫抑制剂和 Leflunomide 活性代谢物 A771726 的类似物。Laflunimus 是一种口服的二氢硼酸脱氢酶 (DHODH) 抑制剂。Laflunimus 抑制免疫球蛋白 (Ig) 分泌，抑制 Ig M 和 IgG 分泌的 IC₅₀ 值分别为 2.5 和 2 μM。Laflunimus 也是前列腺素内过氧化物合酶 (PGHS) -1 和 -2 抑制剂。

Laflunimus (HR325) is an immunosuppressive agent and an analogue of the Leflunomide-active metabolite A77 1726. Laflunimus is an orally active inhibitor of dihydroorotate dehydrogenase (DHODH). Laflunimus suppresses immunoglobulin (Ig) secretion, with IC 50 values of 2.5 and 2 μM for IgM and IgG, respectively. Laflunimus also is a prostaglandin endoperoxide H synthase (PGHS) -1 and -2 inhibitor.

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Ig secretion from mouse splenocytes was induced by lipopolysaccharide (LPS) for 5 days. Laflunimus inhibited the secretion of IgM and IgG with IC50 values of 2.5 and 2 μM , respectively. Adding Uridine (50 μ M) increased these values to 70 and 60 μ M, respectively. Laflunimus inhibits LPS-induced kappa light-chain cell surface expression on 70Z/3 cells, a property also reversed by uridine.
Laflunimus (HR325) is more potent than A77 1726 as an inhibitor of PGHS in guinea pig polymorphonuclear leukocytes (IC50= 415 and 4400 nM, respectively) and on isolated ovine PGHS-1 (IC50=64 and 742 μM) and PGHS-2 (IC50=100 and 2766 μM). has not independently confirmed the accuracy of these methods. They are for reference only.

HR325 (50 mg/kg; p.o.; days 14-18 after being injected with SRBC) inhibits the secondary anti-sheep red blood cell (SRBC) antibody response with ID 50 values of 38 mg/kg. 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]. Thomson TA, et al. In vitro and in Vivo inhibition of immunoglobulin secretion by the immunosuppressive compound HR325 is reversed by exogenous uridine. Scand J Immunol. 2002 Jul;56(1):35-42.
[2]. Curnock AP, et al. Potencies of leflunomide and HR325 as inhibitors of prostaglandin endoperoxide H synthase-1 and -2: comparison with nonsteroidal anti-inflammatory drugs. J Pharmacol Exp Ther. 1997 Jul;282(1):339-47.

In Vitro: DMSO : 50 mg/mL (161.15 mM; Need ultrasonic)配制储备液