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.
中科院分区:
文献类型:
--
作者:
Ye, Yi;Dang, Dongmin;Viet, Chi T.;Dolan, John C.;Schmidt, Brian L.
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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