Mechanistic Insights Into Photobiomodulation for Primary Dysmenorrhea: A Narrative Review

Area of Science:

• Biomedical Engineering
• Cellular Biology
• Pain Management

Background:

• Primary dysmenorrhea causes significant menstrual pain, often inadequately managed by conventional drugs.
• Photobiomodulation (PBM), specifically red-light therapy, is a non-pharmacologic option being investigated for dysmenorrhea.
• The precise biological mechanisms of PBM for dysmenorrhea relief require further elucidation.

Purpose of the Study:

• To review and synthesize current literature on the molecular and cellular mechanisms of PBM in dysmenorrhea.
• To explore how PBM influences inflammatory mediators and lipid metabolism relevant to menstrual pain.
• To provide a biological basis for optimizing PBM treatment parameters, including wavelength and application sites.

Main Methods:

• A narrative synthesis approach was used, integrating findings from clinical biomarker studies and experimental PBM research.
• Reviewed controlled clinical studies reporting biochemical and metabolomic outcomes.
• Examined foundational research on PBM's interaction with cellular components and signaling pathways.

Main Results:

• Red-light PBM may modulate mitochondrial function (e.g., cytochrome c oxidase) and cellular signaling.
• PBM exposure is linked to changes in inflammation biomarkers, including prostaglandin-related measures.
• Metabolomic data suggest PBM alters lipid metabolism pathways (e.g., glycerophospholipid, linoleic acid, arachidonic acid), potentially with wavelength-specific effects.

Conclusions:

• PBM may alleviate dysmenorrhea symptoms via interconnected effects on mitochondrial signaling, inflammation, and lipid metabolism.
• Red-light PBM applied to the lower abdomen or sacral regions is biologically plausible for dysmenorrhea.
• Future research should focus on dose parameters, standardized biomarkers, and mechanistic patient selection for PBM therapy.