Higher-order processing of nociceptive input is distributed in corticolimbic regions of the brain, including the anterior cingulate, parieto-insular and prefrontal cortices, as well as subcortical structures such as the bed nucleus of stria terminalis and amygdala. In addition to their role in pain processing, these regions encode or modulate emotional, motivational and sensory responses to stress. Thus, pain and stress pathways in the brain intersect at cortical and subcortical forebrain structures. Accordingly, previous work has shown that acute restraint stress in female rats induces heat hyperalgesia in a forebrain-dependent operant test of thermal escape. In the present study, we investigated the effects of social defeat stress in male rats on the operant escape task, as well as in a test of nociceptive thermal preference. After establishing baseline behaviors in these tests, separate groups of rats were socially defeated by dominant "resident" male rats. They were tested for thermal preference after 5 successive social defeat sessions. Escape from cold, heat and a neutral warm temperature also was evaluated after social defeat. Defeated rats exhibited a significant increase in cold preference after social defeat compared to the baseline. In the escape task, the rats exhibited increased escape from warm and nociceptive cold and heat temperatures. Thus, chronic social stress produces hyperalgesia for both hot and cold stimuli in male rats, suggesting a mutually facilitatory cross-regulation between central pathways regulating stress and pain.
Pharmacology, Toxicology and Pharmaceutical Science
2
3%
Other
5
8%
Unknown
12
19%
Attention Score in Context
Attention Score in Context
This research output has an Altmetric Attention Score of 2. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 11 September 2013.
All research outputs
#17,498,044
of 27,265,018 outputs
Outputs from Brain Research
#4,048
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Outputs of similar age
#162,307
of 191,035 outputs
Outputs of similar age from Brain Research
#25
of 35 outputs
Altmetric has tracked 27,265,018 research outputs across all sources so far. This one is in the 33rd percentile – i.e., 33% of other outputs scored the same or lower than it.
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We're also able to compare this research output to 35 others from the same source and published within six weeks on either side of this one. This one is in the 28th percentile – i.e., 28% of its contemporaries scored the same or lower than it.
