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TRPV1 expression in acupuncture points: response to electroacupuncture stimulation.
Therese S Abraham1, Ming-Liang Chen, Sheng-Xing Ma
1Department of Obstetrics and Gynecology, David Geffen School of Medicine at University of California at Los Angeles, Harbor-UCLA Medical Center, Torrance, CA 90502, USA.
Journal of Chemical Neuroanatomy
|January 25, 2011
Summary
Electroacupuncture (EA) upregulates transient receptor potential vanilloid type-1 (TRPV1) in acupuncture points. This enhanced TRPV1 expression in nerve fibers and connective tissue cells may mediate EA signal transduction and local effects.
Area of Science:
- Neuroscience
- Physiology
- Acupuncture Research
Background:
- Transient receptor potential vanilloid type-1 (TRPV1) receptors are involved in pain and sensory transduction.
- Acupuncture points (acupoints) have distinct physiological properties compared to non-acupoints.
Purpose of the Study:
- To investigate TRPV1 receptor distribution in acupoints.
- To determine the effect of electroacupuncture (EA) stimulation on TRPV1 expression in acupoints and control sites.
Main Methods:
- Immunolabeling of rat skin sections from acupoints (BL 40) and non-acupoint controls for TRPV1.
- Assessment of TRPV1 co-localization with C-fiber/A-δ fiber markers and neuronal nitric oxide synthase (nNOS).
- Evaluation of TRPV1 expression changes following EA stimulation.
Main Results:
- Higher TRPV1 immunoreactivity in subepidermal nerve fibers at acupoints compared to non-acupoints.
- EA stimulation significantly increased TRPV1 expression in acupoint nerve fibers.
- TRPV1 co-localized with C-fibers, A-δ fibers, and nNOS in acupoint nerve fibers and dermal cells.
Conclusions:
- Acupoints exhibit higher baseline TRPV1 expression in subepidermal nerve fibers, co-localized with nNOS.
- EA stimulation upregulates TRPV1 in acupoint nerve fibers, potentially enhancing signal transduction to the CNS.
- TRPV1 in dermal connective tissue cells may mediate local EA effects.
