期刊
BRAIN BEHAVIOR AND IMMUNITY
卷 57, 期 -, 页码 38-46出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbi.2016.04.001
关键词
Chronic pain; Lipopolysaccharide; Cytokines; Sickness behavior; Insula; Anterior cingulate cortex; Pre-frontal cortex; Descending pain inhibition; fMRI
资金
- Osher Center for Integrative Medicine
- Swedish Society of Medicine
- Hedlund Foundation
- Swedish Heart-Lung Foundation
- Karolinska Institutet
- Swedish Asthma and Allergy Association
- Swedish Research Council
- Stockholm Stress Center
- Swedish council for working life and social research
- Center for Allergy Research
Low-grade systemic inflammation has been implicated in chronic pain, as well as in comorbid diseases like depression and fatigue. We have previously shown that women's pain perception and regulation is more affected by systemic inflammation than that of men. Here we investigated the neural substrates underlying these effects using an fMRI paradigm previously employed in a clinical population. Fiftyone participants (29 women) were injected with 0.6 ng/kg lipopolysaccharide (LPS) or saline to induce a peripheral inflammatory response. The subjects were then tested with a pressure pain fMRI paradigm designed to capture descending pain inhibitory activity 2 h after injection, and blood was sampled for cytokine analysis. The subjects injected with LPS became more pain sensitive compared to the placebo group, and the heightened pain sensitivity was paralleled by decreased activity in the ventrolateral prefrontal cortex and the rostra( anterior cingulate cortex (rACC) compared to placebo; areas involved in descending pain regulation. The LPS group also had higher activity in the anterior insular cortex, an area underpinning affective and interoceptive pain processing. Women displayed overall less pain-evoked rACC activity compared to men, which may have rendered women less resilient to immune provocation, possibly explaining sex differences in LPS-induced pain sensitivity. Our findings elucidate the pain-related brain circuits affected by experimental peripheral inflammation, strengthening the theoretical link between systemic inflammation and weakened pain regulation in chronic pain disdrders. The results further suggest a possible mechanism underlying the female predominance in many chronic pain disorders. (C) 2016 Elsevier Inc. All rights reserved.
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