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Overview
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Background
IC50: With IC50 of 1.1 to 11 nM, TAK-242 inhibited LPS-induced NO production, tumor necrosis factor-alpha and interleukin (IL)-6 in RAW264.7 cells and mouse peritoneal macrophages [1].
Toll, a member of the Toll-like receptor (TLR) family, was identified as a gene product essential for the development of embryonic dorsoventral polarity in Drosophila melanogaster. Moreover, it has been also found to play a critical role in the antifungal response of flies. TAK-242 (resatorvid), a cyclohexene derivative, is recongnizred as a novel small-molecule compound selectively inhibiting TLR4 signaling.
In vitro: A previous in-vitro study showed that TAK-242 could inhibit the production of lipopolysaccharide-induced inflammatory mediators by binding to the intracellular domain of TLR4 using coimmunoprecipitation approach. Among 10 different human TLRs, TAK-242 selectively bound to TLR4. These findings suggested that TAK-242 could selectively bind to TLR4 and disrupted the interaction of TLR4 with adaptor molecules, thereby inhibiting TLR4 signal transduction and its downstream signaling [2].
In vivo: Preclinical animal study demonostrated that the acute restraint stress exposure upregulateed TLR-4 expression both at the mRNA and protein level in rat. TAK-242 pre-stress administration prevented the accumulation of potentially deleterious inflammatory and oxidative/nitrosative mediators in the brain frontal cortex of rats. These finding s indicated that the use of TAK-242 or other TLR-4 signalling pathway inhibitory compounds could be considered as a potential therapeutic adjuvant strategy to constrain the inflammatory process taking place after stress exposure and in stress-related neuropsychiatric diseases [3].
Clinical trial: To evaluate whether TAK-242, a small-molecule inhibitor of Toll-like receptor-4–mediated signaling, suppresses cytokine levels and improves 28-day all-cause mortality rates in patients with severe sepsis has been conducted in Japan, the U.S. and Europe by Takeda Pharmaceutical Company Limited ("Takeda"). However, following a thorough review of development strategy, Takeda has concluded that TAK-242’s profile does not meet the criteria to support continuation of further development activities. This decision has not been influenced by any concerns over the safety or efficacy of the compound [4].[1] Ii M, Matsunaga N, Hazeki K, Nakamura K, Takashima K, Seya T, Hazeki O, Kitazaki T, Iizawa Y. A novel cyclohexene derivative, ethyl (6R)-6-[N-(2-Chloro-4-fluorophenyl)sulfamoyl]cyclohex- 1-ene-1-carboxylate (TAK-242), selectively inhibits toll-like receptor 4-mediated cytokine production through suppression of intracellular signaling. Mol Pharmacol. 2006;69(4):1288-95.
[2] Naoko Matsunaga, Noboru Tsuchimori, Tatsumi Matsumoto, and Masayuki Ii. TAK-242 (Resatorvid), a Small-Molecule Inhibitor of Toll-Like Receptor (TLR) 4 Signaling, Binds Selectively to TLR4 and Interferes with Interactions between TLR4 and Its Adaptor Molecules. Mol Pharmacol 79:34–41, 2011.
[3] Iciar Gárate, Borja García-Bueno, José Luis Mu oz Madrigal, Javier R Caso, Luis Alou, María Luisa Gómez-Lus and Juan Carlos Leza. Toll-like 4 receptor inhibitor TAK-242 decreases neuroinflammation in rat brain frontal cortex after stress. Journal of Neuroinflammation 2014, 11:8.
[4] Todd W. Rice; Arthur P. Wheeler; Gordon R. Bernard; Jean-Louis Vincent; Derek C. Angus; Naoki Aikawa; Ignace Demeyer; Stephen Sainati; Nicholas Amlot; Charlie Cao; Masayuki Ii; Hideyasu Matsuda; Kouji Mouri; Jon Cohen. A randomized, double-blind, placebo-controlled trial of TAK-242 for the treatment of severe sepsis. Crit Care Med 2010 Vol. 38, No. 8: 1-10.
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