化瘀止痛法外用对骨癌疼痛模型的镇痛作用及机制研究

目的 观察化瘀止痛法外用对骨痛疼痛模型的镇痛作用.方法 SD大鼠左后肢胫骨内接种MRMT-1细胞,制成骨转移癌疼痛模型,给予外用化瘀止痛方药治疗.观察大鼠痛行为学改变,包括yon Frey纤维刺激的50%缩足阈(50%PWT)、热刺激缩足潜伏期(TWL).对背根神经节标本用HE染色观察病理形态学改变.结果 相对于模型组,中药治疗组50%PWT明显延长,TWL延长.病理形态学显示背根神经节神经元细胞结构改变减少.神经元胞体胞核固缩减少,多核仁细胞减少.结论 化瘀止痛法外用可有效拮抗外周伤害感受器,抑制骨转移癌疼痛.

Study on function and mechanism of analgesic effects of herbal medicine extraction on bone cancer pain

Objective To evaluate the analgesic effects of herbal medicine extraction on bone cancer pain of rat models. Methods Rat models of cancer-induced bone pain was established by using the MRMT-1 cell line injected into the tibia. Changes of behavioral signs indicative of pain including 50% paw withdrawal threshold (von Frey tactile sensitivity test)and thermal withdrawal latency were observed. The cellular reorganization of dorsal root ganglion (DRG) was measured by histological analysis. Results In the behavioural tests, herbal medicine treatment attenuated mechanical allodynia and thermal hyperalgesia. Histological examination showed that herbal medicine inhibited DRG neuronal nuclear and somatic size reduction with nucleolar segregation. Conclusion The herbal medicine extraction was an anti-nociceptive agent in rat models of bone cancer pain.