Kininogen-Nitric Oxide Signaling at Nearby Nonexcited Acupoints after Long-Term Stimulation

Area of Science:

• Biomedical science
• Integrative medicine
• Acupuncture research

Background:

• Acupuncture's therapeutic effects are well-documented, yet the precise biological mechanisms at acupoints remain largely unknown.
• Understanding the molecular changes induced by acupoint stimulation is crucial for validating acupuncture's efficacy.
• Existing research lacks detailed molecular insights into the immediate and adjacent effects of acupoint activation.

Purpose of the Study:

• To investigate the proteomic alterations in and around stimulated acupoints.
• To identify key molecular pathways involved in acupoint activation.
• To elucidate the biological basis of acupuncture treatment.

Main Methods:

• Utilized catgut embedding to stimulate a specific acupoint in Sprague Dawley rats for 8 weeks.
• Employed isobaric tags for relative and absolute quantitation (iTRAQ) to screen for differentially expressed proteins.
• Analyzed protein expression in both stimulated and adjacent acupoints along the same meridian.

Main Results:

• Significantly upregulated kininogen expression was observed in both stimulated and nonstimulated adjacent acupoints along the same meridian.
• Enhanced kininogen expression demonstrated meridian dependency, predominantly in small subcutaneous vessels.
• Increased signals for nitric oxide synthases, cGMP-dependent protein kinase, and myosin light chain were detected in nonstimulated adjacent acupoints.

Conclusions:

• Acupoint stimulation induces significant, meridian-dependent changes in protein expression, notably kininogen.
• The kininogen-nitric oxide signaling pathway plays a critical role in the biological response to acupoint activation.
• These findings provide novel biological insights into the mechanisms underlying acupuncture treatment.