Pain behavior in the formalin test persists after ablation of the great majority of C-fiber nociceptors.
Pain behavior in the formalin test persists after ablation of the great majority of C-fiber nociceptors.
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DOI:
10.1016/j.pain.2010.08.001
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发表时间:
2010-11
期刊:
影响因子:
7.4
通讯作者:
Basbaum AI
中科院分区:
文献类型:
--
作者:
Shields SD;Cavanaugh DJ;Lee H;Anderson DJ;Basbaum AI
Although the formalin test is a widely used model of persistent pain, the primary afferent fiber types that underlie the cellular and behavioral responses to formalin injection are largely unknown. Here we used a combined genetic and pharmacological approach to investigate the effect of ablating subsets of primary afferent nociceptors on formalin-induced nocifensive behaviors and spinal cord Fos protein expression. Intrathecal capsaicin-induced ablation of the central terminals of TRPV1+ neurons greatly reduced the behavioral responses and Fos elicited by low-dose (0.5%) formalin. In contrast, genetic ablation of the MrgprD-expressing subset of nonpeptidergic unmyelinated afferents, which constitute a largely non-overlapping population, altered neither the behavior nor the Fos induced by low-dose formalin. Remarkably, nocifensive behavior following high-dose (2%) formalin was unchanged in mice lacking either afferent population, or even in mice lacking both populations, which together make up the great majority of C-fiber nociceptors. Thus, at high doses, which are routinely used in the formalin test, formalin-induced “pain” behavior persists in the absence of the vast majority of C-fiber nociceptors, which points to a contribution of a large spectrum of afferents secondary to non-specific formalin-induced tissue and nerve damage.
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