Analgesia targeting IB4-positive neurons in cancer-induced mechanical hypersensitivity.

Analgesia targeting IB4-positive neurons in cancer-induced mechanical hypersensitivity.
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DOI:
10.1016/j.jpain.2012.01.006
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发表时间:
2012-06
期刊:
影响因子:
4
通讯作者:
Schmidt, Brian L.
Schmidt, Brian L.
中科院分区:
医学2区
文献类型:
--
作者:
Ye, Yi;Dang, Dongmin;Viet, Chi T.;Dolan, John C.;Schmidt, Brian L.

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癌症患者经常遭受疼痛,大多数人会开μ-阿片类药物。μ-阿片类药物治疗癌痛效果不理想,并伴有多种衰弱性副作用。最近的研究表明,μ和δ阿片受体分别表达在IB4(−)和IB4(+)神经元上,分别控制热痛和机械痛。在本研究中,我们研究了原位小鼠口腔癌模型中IB4(+)和IB4(−)神经元在机械和热超敏反应中的作用。我们使用δ阿片受体激动剂和P2X3拮抗剂靶向IB4(+)神经元,并证明该亚群在癌症诱导的机械异常性痛中起关键作用,但在热痛觉过敏中不起作用。此外,使用IB4- sap选择性去除IB4(+)神经元会影响癌症诱导的机械过敏,但不会影响热过敏。我们的研究结果表明,外周给药的药物靶向IB4(+)神经元,如选择性δ-阿片受体激动剂或P2X3拮抗剂,可能有助于治疗口腔癌疼痛。为了阐明口腔癌疼痛的机制,我们研究了IB4(+)和IB4(-)神经元的差异作用。这两个假定的伤害感受器亚群的特征对于进一步开发有效的临床癌症疼痛缓解非常重要。
Cancer patients often suffer from pain and most will be prescribed μ-opioids. μ-opioids are not satisfactory in treating cancer pain and are associated with multiple debilitating side effects. Recent studies show that μ and δ opioid receptors are separately expressed on IB4 (−) and IB4 (+) neurons which control thermal and mechanical pain, respectively. In this study we investigated IB4 (+) and IB4 (−) neurons in mechanical and thermal hypersensitivity in an orthotopic mouse oral cancer model. We used a δ opioid receptor agonist and a P2X3 antagonist to target IB4 (+) neurons and to demonstrate that this subset plays a key role in cancer-induced mechanical allodynia, but not in thermal hyperalgesia. Moreover, selective removal of IB4 (+) neurons using IB4-SAP impacts cancer-induced mechanical but not thermal hypersensitivity. Our results demonstrate that peripherally administered pharmacological agents targeting IB4 (+) neurons, such as a selective δ-opioid receptor agonist or P2X3 antagonist, might be useful in treating oral cancer pain. To clarify the mechanisms of oral cancer pain, we examined the differential role of IB4 (+) and IB4 (−) neurons. Characterization of these two subsets of putative nociceptors is important for further development of effective clinical cancer pain relief.
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影响因子: 1.7
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