期刊
MOLECULAR PAIN
卷 16, 期 -, 页码 -出版社
SAGE PUBLICATIONS INC
DOI: 10.1177/1744806920975950
关键词
Acid sensing ion channels; ASIC3; bone; pain; electrophysiology; inflammatory pain
资金
- Australian National Health and Medical Research Council
The Acid Sensing Ion Channel 3 (ASIC3) is a non-selective cation channel that is activated by acidification, and is known to have a role in regulating inflammatory pain. It has pro-algesic roles in a range of conditions that present with bone pain, but the mechanism for this has not yet been demonstrated. We aimed to determine if ASIC3 is expressed in A delta and/or C fiber bone afferent neurons, and to explore its role in the activation and sensitization of bone afferent neurons after acute inflammation. A combination of retrograde tracing and immunohistochemistry was used to determine expression of ASIC3 in the soma of bone afferent neurons. A novel, in vivo, electrophysiological bone-nerve preparation was used to make recordings of the activity and sensitivity of bone afferent neurons in the presence of carrageenan-induced inflammation, with and without the selective ASIC3 inhibitor APETx2. A substantial proportion of bone afferent neurons express ASIC3, including unmyelinated (neurofilament poor) and small diameter myelinated (neurofilament rich) neurons that are likely to be C and A delta nerve fibers respectively. Electrophysiological recordings revealed that application of APETx2 to the marrow cavity inhibited carrageenan-induced spontaneous activity of C and A delta fiber bone afferent neurons. APETx2 also inhibited carrageenan-induced sensitization of A delta and C fiber bone afferent neurons to mechanical stimulation, but had no effect on the sensitivity of bone afferent neurons in the absence of inflammation. This evidence supports a role for ASIC3 in the pathogenesis of pain associated with inflammation of the bone.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据