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阿片受体拮抗剂对紫杉醇诱发周围神经病变大鼠电针产生的抗痛觉过敏/痛觉超敏的影响。

The effects of opioid receptor antagonists on electroacupuncture-produced anti-allodynia/hyperalgesia in rats with paclitaxel-evoked peripheral neuropathy.

机构信息

Center for Integrative Medicine, School of Medicine, University of Maryland, Baltimore, MD 21201, USA.

出版信息

Brain Res. 2011 Sep 26;1414:58-65. doi: 10.1016/j.brainres.2011.08.004. Epub 2011 Aug 7.

Abstract

Research supports the effectiveness of acupuncture for conditions such as chronic low back and knee pain. In a five-patient pilot study the modality also improved the symptoms of chemotherapy-induced neuropathic pain. Using an established rat model of paclitaxel-induced peripheral neuropathy, we evaluated the effect of electroacupuncture (EA) on paclitaxel-induced hyperalgesia and allodynia that has not been studied in an animal model. We hypothesize that EA would relieve the paclitaxel-induced mechanical allodynia and hyperalgesia, which was assessed 30 min after EA using von Frey filaments. Beginning on day 13, the response frequency to von Frey filaments (4-15 g) was significantly increased in paclitaxel-injected rats compared to those injected with vehicle. EA at 10 Hz significantly (P<0.05) decreased response frequency at 4-15 g compared to sham EA; EA at 100 Hz only decreased response frequency at 15 g stimulation. Compared to sham EA plus vehicle, EA at 10 Hz plus either a μ, δ, or κ opioid receptor antagonist did not significantly decrease mechanical response frequency, indicating that all three antagonists blocked EA inhibition of allodynia and hyperalgesia. Since we previously demonstrated that μ and δ but not κ opioid receptors affect EA anti-hyperalgesia in an inflammatory pain model, these data show that EA inhibits pain through different opioid receptors under varying conditions. Our data indicate that EA at 10 Hz inhibits mechanical allodynia/hyperalgesia more potently than does EA at 100 Hz. Thus, EA significantly inhibits paclitaxel-induced allodynia/hyperalgesia through spinal opioid receptors, and EA may be a useful complementary treatment for neuropathic pain patients.

摘要

研究支持针灸对于慢性下背和膝盖疼痛等疾病的有效性。在一项五例患者的试验研究中,这种疗法也改善了化疗引起的神经性疼痛的症状。使用已建立的紫杉醇诱导的周围神经病变大鼠模型,我们评估了电针对紫杉醇诱导的痛觉过敏和感觉异常的影响,这在动物模型中尚未研究过。我们假设电针会缓解紫杉醇引起的机械性痛觉过敏和痛觉异常,这是在用 von Frey 纤维评估电针后 30 分钟评估的。从第 13 天开始,与接受载体注射的大鼠相比,紫杉醇注射大鼠对 von Frey 纤维(4-15 g)的反应频率显着增加。与假电针相比,10 Hz 的电针显着(P<0.05)降低了 4-15 g 的反应频率;100 Hz 的电针仅降低了 15 g 刺激时的反应频率。与假电针加载体相比,10 Hz 的电针加 μ、δ 或 κ 阿片受体拮抗剂并未显着降低机械反应频率,表明这三种拮抗剂均阻断了电针抑制痛觉过敏和痛觉异常。由于我们之前证明 μ 和 δ 阿片受体而不是 κ 阿片受体影响炎症性疼痛模型中的电针抗痛觉过敏,这些数据表明,在不同条件下,电针通过不同的阿片受体抑制疼痛。我们的数据表明,10 Hz 的电针比 100 Hz 的电针更有效地抑制机械性痛觉过敏/痛觉异常。因此,电针对紫杉醇诱导的痛觉过敏/痛觉异常的抑制作用通过脊髓阿片受体,电针可能是治疗神经性疼痛患者的有用辅助治疗方法。

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