How Acupuncture May Restore Mitochondrial Function After Brain Injury

Traumatic brain injury (TBI) affects an estimated 69 million people each year, at roughly 939 cases per 100,000 population. The Global Burden of Disease 2021 analysis counted 20.84 million new cases, 37.93 million existing cases, and 5.48 million years lived with disability. Much of the lasting harm comes from secondary injury after the initial impact, and mitochondrial dysfunction is central to it. It drives energy failure, oxidative stress, calcium overload, inflammation, and neuronal death. That makes mitochondrial homeostasis an attractive treatment target.

The authors ran a targeted narrative search, not a systematic review or meta-analysis. They searched PubMed, Web of Science, CNKI, and Wanfang, with the last update on May 24, 2026. They included studies of acupuncture-type interventions that measured mitochondrial or mitochondria-related outcomes in TBI or related brain injury models. They then graded the evidence into three tiers: direct TBI evidence, indirect evidence from related models such as ischemic stroke and brain hemorrhage, and hypothesis-generating mechanisms. The review organizes the findings by structural, quantity, and functional/metabolic homeostasis.

On structure, TBI tends to push mitochondria toward excessive fission, with Drp1 activation and OPA1 loss. Direct TBI studies show acupuncture reduces tissue damage and injury markers. The detailed Drp1/Fis1/Mfn2/OPA1 findings come mostly from cerebral ischemia–reperfusion models, where electroacupuncture lowered fission proteins and raised fusion proteins. On quantity, bloodletting at the twelve Jing-well points in TBI rats raised PGC-1α, TFAM, and mtDNA copy number at 72 hours. In a mild TBI rat model, electroacupuncture improved Morris water maze performance and activated SIRT1/PGC-1α. Evidence on PINK1/Parkin and FUNDC1 mitophagy is almost entirely indirect.

On function, electroacupuncture in mild TBI rats increased ATP content and complex I activity. In TBI rats, it also reduced ROS, lipid peroxidation, MDA, cytochrome c, and caspase-3, and dampened PANX1/ATP/Ca2+ signaling, per Liu et al. Related models suggest it supports Na+/K+-ATPase activity and ion gradients. Links to miR-124-3p/GSK-3β/Cyp-D regulation of the mitochondrial permeability transition pore come mainly from ischemia studies. The authors note that many studies measure total cellular ROS rather than mitochondria-specific ROS, so mitochondrial specificity is not established.

The review also covers more speculative ideas. Astrocytes may pass healthy mitochondria to injured neurons through tunneling nanotubes and Cx43-linked structures, and one ischemia study reported electroacupuncture promoted this transfer via a CD38–cADPR–Ca2+ axis. Acupuncture may also calm microglial NF-κB/COX2 signaling and so spare neurons from inflammatory damage. Direct evidence that it reprograms microglial metabolism after TBI is limited. The authors propose experiments such as mitochondrial lineage tracing, cell-specific knockouts, and pathway inhibition.

The conclusion is cautious. Preclinical data suggest electroacupuncture may influence mitochondrial homeostasis after TBI in multidimensional, context-dependent ways. Direct TBI-specific evidence is limited and the animal-dominated literature lacks standardized stimulation protocols and clinical mechanistic biomarkers. Several mechanisms need validation before acupuncture-mediated mitochondrial regulation can be called a clinically established strategy. As a narrative review without formal quality scoring, it may also be subject to selection bias.