Placebo-induced analgesia in an operant pain model in rats.
Placebo-induced analgesia in an operant pain model in rats.
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DOI:
10.1016/j.pain.2012.04.026
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发表时间:
2012-10
期刊:
影响因子:
7.4
通讯作者:
Neubert JK
中科院分区:
文献类型:
--
作者:
Nolan TA;Price DD;Caudle RM;Murphy NP;Neubert JK
Analgesia is particularly susceptible to placebo responses. Recent studies in humans have provided important insights into the neurobiology underlying placebo-induced analgesia. However, human studies provide incomplete mechanistic explanations of placebo analgesia because of limited capacity to use cellular, molecular, and genetic manipulations. To address this shortcoming, we describe here the development of a rat model of conditioned analgesia in an operant pain assay. Specifically, rats were conditioned to associate a placebo manipulation with the analgesic effect of 1 mg/kg morphine (s.c.) on facial thermal pain. We found that conditioned (placebo) responding bore three of the hallmarks of placebo-induced analgesia: (1) strong inter-animal variability in the response, (2) suppression by the opiate antagonist naloxone (5 mg/kg, s.c.), and (3) a positive predictive relationship between the unconditioned analgesic effect and the conditioned (placebo) effect. Due to the operant nature of the assay and the use of only a mild noxious thermal stimulus, we suggest these results provide evidence of placebo-induced analgesia in a preclinical model that utilizes an affective behavioral endpoint. This finding may provide opportunities for invasive preclinical studies allowing greater understanding of placebo-induced analgesia, thus paving the way for avenues to harness its benefits.
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影响因子:
--
作者:
Gardner EL
通讯作者:
Gardner EL
影响因子:
82.9
作者:
Benedetti, Fabrizio;Amanzio, Martina;Blanchard, Catherine
通讯作者:
Blanchard, Catherine
影响因子:
7.4
作者:
Bingel, U;Lorenz, J;Büchel, C
通讯作者:
Büchel, C
影响因子:
4.1
作者:
Guo, J-Y;Wang, J-Y;Luo, F.
通讯作者:
Luo, F.
影响因子:
16.2
作者:
Eippert, Falk;Bingel, Ulrike;Buechel, Christian
通讯作者:
Buechel, Christian