Condition Focus: Knee Osteoarthritis — Mitochondrial and Oxidative Stress Mechanisms
This 2023 review in Frontiers in Cell and Developmental Biology examines the current state of photobiomodulation research in knee osteoarthritis through a mechanistic lens — focusing specifically on how PBM interacts with mitochondrial function, oxidative stress, and cartilage metabolism at the cellular level.
The review traces the pathway from photon absorption to clinical outcome: light at red and near-infrared wavelengths is absorbed by cytochrome c oxidase (CCO) in the mitochondrial electron transport chain, increasing ATP production and modulating reactive oxygen species (ROS). In osteoarthritic joints, where mitochondrial dysfunction and excessive oxidative stress drive cartilage degradation, this mitochondrial “recharge” helps restore the cellular energy balance needed for tissue maintenance and repair.
The authors highlight that PBM’s oxidative stress reduction is particularly relevant for conditions where ROS play a central pathological role. In gout, this connection is direct: urate crystal deposition triggers a burst of mitochondrial ROS that activates the NLRP3 inflammasome — the molecular switch that initiates the acute flare. By reducing oxidative stress at the mitochondrial level, PBM may help interrupt this cascade before it produces the full inflammatory response.
The review also discusses PBM’s effects on cartilage metabolism, including protection of chondrocytes (cartilage-producing cells) from inflammatory damage — relevant for gout patients with chronic disease who face progressive joint damage from repeated flares.
G.O.A.T. for Gout Alignment:
The CCO-mediated mitochondrial mechanism reviewed here is the foundational pathway through which the G.O.A.T.’s 660 nm and 850 nm wavelengths exert their effects. The oxidative stress reduction demonstrated in OA directly parallels the ROS-NLRP3 axis in gout, suggesting the G.O.A.T. may address both the energy deficit and the inflammatory trigger in gouty joints.
Link to original research here
Editor’s note: The mitochondrial mechanisms discussed here are explored in foundational detail in de Freitas & Hamblin 2016. For direct evidence of oxidative stress reduction in a knee OA pain model, see Yamada et al 2020. The connection between mitochondrial ROS and NLRP3 inflammasome activation in gout is detailed in Braga et al 2017. The hormetic (dose-dependent) nature of PBM’s oxidative stress effects is examined in PBM and Oxidative Stress 2022.
Related Articles
- Effects of PBM on OA from In Vivo and In Vitro Studies – Narrative Review 2025
- PBM Reduces Oxidative Stress and Inflammation in Knee OA – Yamada et al 2020
- Soluble Urate Activates the NLRP3 Inflammasome via Mitochondrial ROS – Braga et al 2017
- PBM and Oxidative Stress: Mitochondrial Activity Regulation – 2022
- Mechanisms and Efficacy of PBM for Arthritis – Zhang et al 2023
Key Takeaways
- PBM reduces oxidative stress and protects cartilage in knee OA via mitochondrial CCO activation
- ATP production enhancement helps restore cellular energy balance in damaged joints
- ROS reduction directly parallels the ROS-NLRP3 axis that triggers gout flares
- Cartilage metabolism support relevant for chronic gout patients with progressive joint damage
Study Overview
| Study Type: | Review |
| Wavelength(s): | Multiple (red + NIR range) |
| Treatment Protocol: | Varies across reviewed studies |
| Sample Size: | Review of animal and human studies |
| Primary Outcome: | Mitochondrial mechanism, oxidative stress reduction, cartilage protection in OA |
Full Citation
Current advances of photobiomodulation therapy in treating knee osteoarthritis. (2023). Frontiers in Cell and Developmental Biology, 11, 1286025. View Publication
