Cathepsin S inhibitors attenuate mechanical allodynia in preclinical neuropathic pain models. The current study evaluated the effects when combining the selective cathepsin S inhibitor MIV-247 with gabapentin or pregabalin in a mouse model of neuropathic pain. Mice were rendered neuropathic by partial sciatic nerve ligation. MIV-247, gabapentin, or pregabalin were administered alone or in combination via oral gavage. Mechanical allodynia was assessed using von Frey hairs. Neurobehavioral side effects were evaluated by assessing beam walking. MIV-247, gabapentin, and pregabalin concentrations in various tissues were measured. Oral administration of MIV-247 (100-200 µ mol/kg) dose-dependently attenuated mechanical allodynia by up to approximately 50% reversal when given as a single dose or when given twice daily for 5 days. No behavioral deficits were observed at any dose of MIV-247 tested. Gabapentin (58-350 µ mol/kg) and pregabalin (63-377 µ mol/kg) also inhibited mechanical allodynia with virtually complete reversal at the highest doses tested. The minimum effective dose of MIV-247 (100 µ mol/kg) in combination with the minimum effective dose of pregabalin (75 µ mol/kg) or gabapentin (146 µ mol/kg) resulted in enhanced antiallodynic efficacy without augmenting side effects. A subeffective dose of MIV-247 (50 µ mol/kg) in combination with a subeffective dose of pregabalin (38 µ mol/kg) or gabapentin (73 µ mol/kg) also resulted in substantial efficacy. Plasma levels of MIV-247, gabapentin, and pregabalin were similar when given in combination as to when given alone. Cathepsin S inhibition with MIV-247 exerts significant antiallodynic efficacy alone, and also enhances the effect of gabapentin and pregabalin without increasing side effects or inducing pharmacokinetic interactions.
猫肽酶 S
抑制剂在临床前神经病理性疼痛模型中减轻机械性异痛。本研究评估了在小鼠神经病理性疼痛模型中,将选择性猫肽酶 S
抑制剂 MIV-247 与
加巴喷丁或
普瑞巴林结合使用的效果。通过部分坐骨神经结扎使小鼠出现神经病理性疼痛。MIV-247、
加巴喷丁或
普瑞巴林以单独或组合的方式通过口服灌胃给药。使用冯·弗雷毛发评估机械性异痛。通过评估走杆实验来评价神经行为副作用。测量了 MIV-247、
加巴喷丁和
普瑞巴林在各种组织中的浓度。口服给药 MIV-247(100-200 µ mol/kg)能够剂量依赖性地减轻机械性异痛,单次给药或每日两次连续给药 5 天时最多可逆转约 50%。在测试的任何剂量下未观察到 MIV-247 的行为缺陷。
加巴喷丁(58-350 µ mol/kg)和
普瑞巴林(63-377 µ mol/kg)也能抑制机械性异痛,在测试的最高剂量下几乎完全逆转。MIV-247 的最低有效剂量(100 µ mol/kg)与
普瑞巴林的最低有效剂量(75 µ mol/kg)或
加巴喷丁(146 µ mol/kg)联合使用后,增强了抗异痛效果而未增加副作用。MIV-247 的亚有效剂量(50 µ mol/kg)与
普瑞巴林的亚有效剂量(38 µ mol/kg)或
加巴喷丁(73 µ mol/kg)联合使用后也产生了显著的效果。MIV-247、
加巴喷丁和
普瑞巴林在联合使用时的血浆
水平与单独使用时相似。使用 MIV-247 抑制猫肽酶 S 能显著提高单独的抗异痛效果,并且增强了
加巴喷丁和
普瑞巴林的效果,而不增加副作用或引发药代动力学相互作用。