SB-705498

SB705498是一种hTRPV1拮抗剂，抑制TRPV1的Capsaicin，酸和热激活，IC50分别为3 nM， 0.1 nM和6 nM，该作用具有一定的电压依赖性，作用于TRPV1比作用于TRPM8选择性高100倍以上。Phase 2。SB705498 (0.3 nM-1 μM) potently inhibits capsaicin-induced activation of human TRPV1 expressed in 1321N1 cells or HEK293 cells with apparent pK_i of 7.5 or 7.6, respectively. Coapplication of 100 nM SB705498 rapidly, completely and reversibly inhibits hTRPV1 expressed in HEK293 cells. SB705498 has no significant effect on endogenous [Ca²⁺] responses in HEK293 cells produced by muscarinic acetylcholine receptor activation with carbachol or store-operated channel-mediated Ca²⁺ entry after depletion of intracellular stores with the Ca²⁺ pump inhibitor thapsigargin. SB705498 (10 pM-1 μM) also has no significant antagonist effect versus the close TRPV1 receptor paralog TRPV4 transiently expressed in HEK293 cells and activated using the synthetic ligand 4α-phorbol-12,13-didecanoate (10 μM). SB705498 reveals good antagonist potency against both the rat and guinea pig TRPV1. SB705498 antagonizes rat and guinea pig TRPV1 with pK_i of 7.5 and 7.3, respectively. Coapplication of 100 nM to 10 μM SB705498 to the steady state of a maintained capsaicin response leads to rapid and complete inhibition of hTRPV1 at -70 mV. SB705498 inhibits capsaicin-mediated activation of hTRPV1 with IC50 of 3 nM and 17 nM at positive and negative holding potentials (-70 mV and + 70 mV), respectively. Coapplication of 1 μM SB705498 to the plateau period of the response produces complete and reversible inhibition of the TRPV1-mediated conductance. SB705498 shows approximately equal activity versus multiple and diverse chemical and physical modes of TRPV1 receptor activation. SB705498 shows little or no activity versus a wide range of ion channels, receptors and enzymes. SB705498 produces full blockade of heat as well as pH activation of hTRPV1.SB705498 exhibits potent and reversible blockade against the multiple modes of TRPV1 activation, namely the vanilloid (capsaicin), heat- and acid-mediated activation of the receptor. SB705498 displays excellent activity at 10 and 30 mg/kg po with good reversal of allodynia. SB705498 is also shown to give 80% reversal of allodynia in the guinea pig FCA model at 10 mg/kg p.o..SB705498是一种hTRPV1拮抗剂，抑制TRPV1的Capsaicin，酸和热激活，IC50分别为3 nM， 0.1 nM和6 nM，该作用具有一定的电压依赖性，作用于TRPV1比作用于TRPM8选择性高100倍以上。Phase 2。

Target	Value
hTRPV1 ()	7.6(pKi)
hTRPV1 ()	7.1(pIC50)

SB705498(0.3 nM-1 μM)有效抑制辣椒素诱导的在1321N1细胞或HEK293细胞中表达的人TRPV1的活化，表观pK _i 分别为7.5或7.6。100 nM SB705498快速，完全且可逆地抑制HEK293细胞中表达的hTRPV1。SB705498对毒蕈碱乙酰胆碱受体激活产生的HEK293细胞中内源性[Ca SB705498对TRPV1受体激活的多重不同的化学和物理模式表现出近似相等的活性。SB705498对hTRPV1的高温和pH激活产生完全的阻断。

SB705498对TRPV1激活的多重模式，即辣椒素，热-和酸-介导的受体激活表现出有效可逆的阻断。SB705498以10和30 mg/kg的剂量口服给药表现出良好的活性，并逆转痛觉超敏。SB705498以10 mg/kg的剂量口服给药，在豚鼠FCA模型中逆转80%的痛觉超敏。