ltb4-in-1

LTB4-IN-1 (Anti-inflammatory agent 2, Compound 6) belongs to small molecule inhibitors and is a leukotriene B4 (LTB4) synthesis inhibitor (IC50 = 70 nM) with good anti-inflammatory activity. This compound can be used in experimental research on inflammation-related diseases.

Darbufelone mesylate (CI-1004 mesylate) inhibited PGF2α and LTB4 in cells and demonstrated IC50 values of 0.19 μM for PGHS-2 and 20 μM for PGHS-1.

AM679 is a potent and selective FLAP inhibitor with IC₅₀ values of 2.2 nM (FLAP binding), 0.6 nM (hLA), and 154 nM (hWB). AM679 displays improved CYP inhibition characteristics, no CYP3A4 time-dependent inhibition or induction, and strong in vivo leukotriene inhibition in rodent BAL models after oral administration.

Amelubant (BIIL 284) is a prodrug of active metabolites BIIL 260 and BIIL 315 with anti-inflammatory activity[1]. It is a potent, oral, long-acting LTB4 receptor antagonist that negligibly binds to the LTB4 receptor, exhibiting Kis of 221 nM and 230 nM in vital cells and membranes.

(±)14(15)-EET is a metabolite of arachidonic acid that is formed via epoxidation of arachidonic acid by cytochrome P450.[1],[2] It prevents increases in leukotriene B4, ICAM-1, and chemokine (C-C motif) ligand 1 (CCL2) induced by oxidized LDL in primary rat pulmonary artery endothelial cells (RPAECs) when used at a concentration of 1 μM.[3] (±)14(15)-EET induces dilation of preconstricted isolated canine coronary arterioles (EC50 = 0.2 pM).[4] It reduces myocardial infarct size as a percentage of the area at risk in a canine model of ischemia-reperfusion injury induced by left anterior descending coronary artery (LAD) occlusion when administered at a dose of 0.128 mg/kg prior to occlusion or reperfusion.[5] Reference:[1]. Chacos, N., Falck, J.R., Wixtrom, C., et al. Novel epoxides formed during the liver cytochrome P-450 oxidation of arachidonic acid. Biochem. Biophys. Res. Commun. 104(3), 916-922 (1982).[2]. Oliw, E.H., Guengerich, F.P., and Oates, J.A. Oxygenation of arachidonic acid by hepatic monooxygenases. Isolation and metabolism of four epoxide intermediates. J. Biol. Chem. 257(7), 3771-3781 (1982).[3]. Jiang, J.-X., Zhang, S.-J., Xiong, Y.-K., et al. EETs attenuate ox-LDL-induced LTB4 production and activity by inhibiting p38 MAPK phosphorylation and 5-LO/BLT1 receptor expression in rat pulmonary arterial endothelial cells. PLoS One 10(6), e0128278 (2015).[4]. Oltman, C.L., Weintraub, N.L., VanRollins, M., et al. Epoxyeicosatrienoic acids and dihydroxyeicosatrienoic acids are potent vasodilators in the canine coronary microcirculation. Circ. Res. 83(9), 932-939 (1998).[5]. Nithipatikom, K., Moore, J.M., Isbell, M.A., et al. Epoxyeicosatrienoic acids in cardioprotection: Ischemic versus reperfusion injury. Am. J. Physiol. Heart Circ. Physiol. 291(2), H537-H542 (2006).

Lipoxin A4 methyl ester (LXA4 methyl ester) is a more lipid soluble, prodrug formulation of the transcellular metabolite LXA4. LXA4 is a trihydroxy fatty acid containing a conjugated tetraene, produced by the metabolism of 15-HETE or 15-HpETE with human leukocytes.[1] LXA4 is equipotent to leukotriene B4 (LTB4) in inducing superoxide generation in human neutrophils at 0.1 μM.[2] LXA4 is associated with several other biological functions including leukocyte activation, chemotaxis effects, natural killer cell inhibition, and monocyte migration and adhesion.[2],[3],[4]

Lipid-derived lipoxins are produced at the site of vascular and mucosal inflammation where they down-regulate polymorphonuclear leukocyte recruitment and function. 15(R)-Lipoxin A4 (15(R)-LXA4) is derived from the aspirin-triggered formation of 15(R)-HETE from arachidonic acid. [1] [2] 15(R)-LXA4 inhibits LTB4-induced chemotaxis, adherence, and transmigration of neutrophils with twice the potency of LXA4 demonstrating activity in the nM range.[2] [3] The anti-inflammatory effects of aspirin may be ascribed in part to the ability of 15(R)-LXA4 to regulate leukocyte function.[4] 15(R)-LXA4 is reported to promote resolution of inflammation in LPS-treated stromal cells derived from intermediate-stage diseased supraspinatus tendons as evidenced by increased expression of the STAT-6 pathway target genes, ALOX15 and CD206.[5]

Ricinelaidic acid is a 12-hydroxy fatty acid and an antagonist of leukotriene B4 (LTB4) receptors (Ki = 2 μM in porcine neutrophil membranes). It inhibits chemotaxis and calcium flux induced by LTB4 in isolated human neutrophils (IC50s = 10 and 7 μM, respectively). Ricinelaidic acid (1 mg/kg, i.v.) inhibits bronchoconstriction induced by LTB4 in rats by 46%.

LTB4-IN-2 (Compound 6x) is a selective inhibitor of Leukotriene B4 (LTB4), acting by specifically targeting the 5-Lipoxygenase-activating protein (FLAP) with an inhibitory concentration (IC 50) of 1.15 μM, thus serving as a potential agent for anti-inflammatory research [1].

Prostaglandin E2 (PGE2) inhibitor 3 is a selective inhibitor targeting microsomal prostaglandin E synthase-1 (mPGES-1; IC50 = 0.2 µM), demonstrating greater selectivity for mPGES-1 over COX-1, COX-2, 5-lipoxygenase (5-LO), and soluble epoxide hydrolase (sEH) in assays at 10 µM. This compound effectively reduces IL-1β-induced PGE2 production in A549 cells and decreases LPS-induced IL-6 and PGE2 in J774A.1 macrophages at concentrations of 10 and 1 µM, respectively. Additionally, it blocks the production of 5-LO-derived products, including leukotriene B4 (LTB4) and 5-H(p)ETE, in response to calcium ionophore A23187 alone or combined with arachidonic acid, with IC50 values of 4.9 and 5.2 µM, respectively. When administered in vivo at doses of 10 mg/kg, PGE2 inhibitor 3 effectively prevents leukocyte infiltration in a mouse model of zymosan-induced peritonitis.

Agnuside (Standard) is a reference standard for research and analysis in studies involving Agnuside. Agnuside (chasteberry oil) inhibits COX-2 (IC50: 0.026 mg/ml) but exhibits less than 10% inhibition of COX-1 at this concentration. It also inhibits 46.3, 66.8, and 82.1% of P-glycoprotein (P-gp) ATPase activity at concentrations of 5, 25, and 100 μM, respectively.