Twenty percent of Americans suffer from chronic pain, a poorly understood condition that is refractory to treatment, severely limits quality of life, and is a tremendous burden on the healthcare system and the economy. Sleep disturbance is an equally ubiquitous problem and among the most common and disabling comorbidities associated with chronic pain. Sleep disturbance is not simply a consequence of pain, it substantially increases the risk of transitioning from acute pain to a chronic disorder. Although it is not known how sleep disturbance increases risk, preliminary evidence suggests that even partial sleep deprivation may cause hyperalgesia, i.e., enhanced responsivity to painful stimulation. Hyperalgesia is critical to the etiology and maintenance of chronic pain syndromes, but the complex biobehavioral factors that promote hyperalgesia are poorly understood. The mechanisms by which sleep disturbance promotes hyperalgesia have yet to be studied. We propose a novel research program to study the mechanisms of sleep disruption hyperalgesia (SD_HA). Addressing this knowledge gap has critical implications for the etiology, prevention and treatment of chronic pain. Pre-clinical studies and preliminary data from our groups implicate two possibly interrelated candidate mechanisms of major clinical import: 1) inflammation and 2) opioidergic antinociceptive system impairment. We have assembled an interdisciplinary team from Johns Hopkins and UCLA to conduct a controlled experiment in healthy human subjects to determine the role of inflammation in SD_HA and study the effects of sleep disruption and inflammation on opioid analgesia. We will employ a novel sleep disruption manipulation developed by our group that uses multiple, forced awakenings to mimic the pattern of sleep loss most commonly associated with pain and insomnia. Following undisturbed sleep and sleep disruption conditions, we will assess next-day hyperalgesia and analgesic response to either: (a) morphine or (b) placebo.
Our specific aims are to: 1) examine the effects of experimental sleep disruption on spinal sensitization (secondary hyperalgesia) by evaluating laboratory pain responses in the heat-capsaicin pain model;2) examine the effects of sleep disruption on opioid analgesia and 3) determine the effects of sleep disruption on genomic, cellular, and systemic markers of inflammation and characterize the role of inflammation on laboratory pain responses and opioid analgesia. We hypothesize that SD_HA and diminished opioid analgesia will be mediated by enhanced inflammation attributable to the sleep disruption manipulation. Focusing on genomic and cellular dimensions of the inflammatory cascade, opioidergic function and their interaction will lead to a better understanding of chronic pain pathophysiology and could have tremendous impact on the development of novel pain treatment and prevention methods. Findings will also have broad implications for problems such as opioid addiction and chronic medical conditions, such as cardiovascular disease in which inflammation contributes to morbidity and sleep disturbance is common.

Public Health Relevance

The mechanisms of sleep disturbance hyperalgesia are unknown. We will determine whether sleep disruption induces spinally mediated hyperalgesia, impairs opioid analgesia, and evaluate the potential mediating role of inflammation in these processes. Findings could lead to novel pain prevention treatment approaches.

Agency
National Institute of Health (NIH)
Institute
National Institute on Drug Abuse (NIDA)
Type
Research Project (R01)
Project #
1R01DA032922-01
Application #
8232876
Study Section
Biobehavioral Mechanisms of Emotion, Stress and Health Study Section (MESH)
Program Officer
Gordon, Harold
Project Start
2012-06-01
Project End
2017-08-31
Budget Start
2012-06-01
Budget End
2013-08-31
Support Year
1
Fiscal Year
2012
Total Cost
$556,177
Indirect Cost
$171,095
Name
Johns Hopkins University
Department
Type
Schools of Medicine
DUNS #
001910777
City
Baltimore
State
MD
Country
United States
Zip Code
21218
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