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Pain kept under wraps of myelin sheath
1Department of Anesthesiology, University of California, San Diego, La Jolla, CA, United States.
Abstract:
The myelin sheath serves both as insulator and metabolic powerhouse for large-diameter dorsal root ganglia (DRG) neurons-some of the longest cells in the body-transmitting sensory impulses from the periphery to the spinal cord. When myelin is damaged, bioactive fragments of myelin basic protein (MBP) are released, playing a pivotal role in pathological pain. MBP-derived peptides (MBPd) emerge as a ubiquitous yet sex-specific mediator of pain. In females, MBPd triggers a widespread transcriptional response across the peripheral nerve, DRG, and spinal cord, leading to persistent, treatment-resistant tactile allodynia-pain from normally innocuous touch. In contrast, males exhibit only a localized transcriptional response, confined to the nerve, which does not extend to the DRG or spinal cord or induce pain. The sex difference is driven by MBPd's interaction with lipids and regulation of nuclear receptor transcription factors, including the estrogen receptor (ESR) and the liver X receptor (LXR)/retinoid × receptor (RXR) complex-key regulators of lipid and cholesterol metabolisms mounting sex-dependent immunity. By unraveling these fundamental mechanisms of myelin remodeling, this work opens the door to innovative, non-addictive, personalized therapeutics and diagnostics for chronic pain.
Insights
Myelin basic protein fragments cause sex-specific pain by altering gene expression in nerves. This research reveals mechanisms for developing targeted, non-addictive chronic pain treatments.
Area of Science:
- Neuroscience
- Immunology
- Molecular Biology
Background:
- The myelin sheath insulates and supports dorsal root ganglia (DRG) neurons, crucial for sensory transmission.
- Damage to myelin releases bioactive fragments of myelin basic protein (MBP), implicated in pathological pain.
- MBP-derived peptides (MBPd) act as ubiquitous, yet sex-specific, pain mediators.
Purpose of the Study:
- To investigate the sex-specific mechanisms by which MBPd induces chronic pain.
- To elucidate the molecular pathways involved in MBPd-mediated transcriptional responses in the nervous system.
- To identify potential therapeutic targets for sex-specific chronic pain conditions.
Main Methods:
- Analysis of transcriptional responses in peripheral nerve, DRG, and spinal cord following MBPd exposure in a sex-specific manner.
- Investigation of MBPd interactions with lipids and nuclear receptors, including estrogen receptor (ESR) and liver X receptor (LXR)/retinoid × receptor (RXR) complex.
- Assessment of MBPd's role in tactile allodynia and its sex-dependent regulation of lipid metabolism and immunity.
Main Results:
- Females exhibit widespread transcriptional changes in response to MBPd, leading to persistent tactile allodynia.
- Males show a localized transcriptional response confined to the nerve, without inducing pain.
- Sex differences in pain are mediated by MBPd's interaction with lipids and sex-dependent regulation of nuclear receptors (ESR, LXR/RXR).
Conclusions:
- MBPd triggers distinct transcriptional and physiological responses in males and females, explaining sex-specific pain susceptibility.
- The study highlights the critical role of lipid metabolism and nuclear receptor signaling in sex-dependent myelin-related pain.
- Findings pave the way for developing personalized, non-addictive therapeutics for chronic pain based on sex-specific mechanisms.
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