Infection-Driven Coenzyme Q10 Depletion Hypothesis

1 Maes et al. 2009 — Foundational CoQ10 Deficiency in ME/CFS

Full Citation:: Maes M, Mihaylova I, Kubera M, Uytterhoeven M, Vrydags N, Bosmans E. Coenzyme Q10 deficiency in myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) is related to fatigue, autonomic and neurocognitive symptoms and is another risk factor explaining the early mortality in ME/CFS due to cardiovascular disorder. Neuro Endocrinology Letters. 2009;30(4):470–476. (Maes et al. 2009) PMID:: 20010505 Study Design:: Case-control; plasma CoQ10 measurement Sample Size:: n=58 ME/CFS, n=22 healthy controls Key Findings::

- Significantly lower plasma CoQ10 in ME/CFS vs controls
- CoQ10 deficiency correlated with fatigue severity, autonomic symptoms, and neurocognitive symptoms
- Attributed to oxidative stress (IO&NS pathways) but did not distinguish infection-driven consumption from other causes

Conclusion:: First documentation of CoQ10 deficiency in ME/CFS. Provides the observational foundation for the depletion hypothesis. Does not address mechanism of deficiency beyond general IO&NS activation. Limitations:: Lower-tier journal; moderate sample size; single measurement (plasma CoQ10, not tissue levels); cross-sectional; no mechanistic decomposition. Certainty Assessment::

- *Quality:* Medium (Neuro Endocrinol Lett, single group)
- *Sample:* Moderate (n=58 ME/CFS, n=22 controls)
- *Replication:* Not independently replicated for CoQ10 specifically; consistent with Maes group's broader IO&NS findings
- *Score:* 0.55

2 Maes & Twisk 2009 — IO&NS Pathways and Cardiovascular Risk in ME/CFS

Full Citation:: Maes M, Twisk FNM. Why myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) may kill you: disorders in the inflammatory and oxidative and nitrosative stress (IO&NS) pathways may explain cardiovascular disorders in ME/CFS. Neuro Endocrinology Letters. 2009;30(6):677–693. (Maes and Twisk 2009) PMID:: 20038921 Study Design:: Narrative review Key Findings::

- Documents lowered antioxidant status in ME/CFS including CoQ10
- Identifies bacterial and viral infections as precipitating/perpetuating factors
- Proposes chronic IO&NS activation drives pathology

Conclusion:: Establishes IO&NS framework in which CoQ10 depletion occurs as part of broader antioxidant depletion. Limitations:: Review; single-group perspective; no quantitative synthesis. Certainty Assessment::

- *Score:* 0.50

3 Morris et al. 2013 — CoQ10 Depletion Across Medical Disorders (Biochemical Framework)

Full Citation:: Morris G, Anderson G, Berk M, Maes M. Coenzyme Q10 depletion in medical and neuropsychiatric disorders: potential repercussions and therapeutic implications. Molecular Neurobiology. 2013;48(3):883–903. (Morris et al. 2013) DOI:: 10.1007/s12035-013-8477-8 PMID:: 23761046 Study Design:: Comprehensive mechanistic review Key Findings::

- CoQ10 functions as: (1) ETC electron carrier, (2) lipophilic antioxidant quenching lipid peroxidation, (3) membrane stabilizer
- CoQ10 is CONSUMED when neutralizing lipid peroxyl radicals (sacrificial antioxidant)
- Regeneration requires: (1) ETC re-reduction (Complex I/II → CoQ → CoQH2), (2) other antioxidants (GSH, vitamin E, vitamin C)
- Depletion mechanisms: increased consumption (oxidative stress), impaired biosynthesis (genetic COQ defects), statin inhibition of HMG-CoA reductase

Conclusion:: Provides the complete biochemical framework for CoQ10 depletion by oxidative consumption. Establishes that any condition with sustained ROS elevation will deplete CoQ10. Critical for the infection-driven consumption hypothesis: persistent viral/bacterial infection generates chronic ROS → CoQ10 consumed faster than regenerated → deficiency. Limitations:: Review; not ME/CFS-specific; no quantitative modeling. Certainty Assessment::

- *Quality:* High (Mol Neurobiol, comprehensive)
- *Sample:* N/A (review)
- *Score:* 0.65

4 Morris & Maes 2014 — Mitochondrial Dysfunction Explained by IO&NS Pathways

Full Citation:: Morris G, Maes M. Mitochondrial dysfunctions in myalgic encephalomyelitis/chronic fatigue syndrome explained by activated immuno-inflammatory, oxidative and nitrosative stress pathways. Metabolic Brain Disease. 2014;29(1):19–36. (Morris and Maes 2014) DOI:: 10.1007/s11011-013-9435-x PMID:: 24557875 Study Design:: Mechanistic review Key Findings::

- IO&NS activation in ME/CFS damages ETC complexes, impairing ATP synthesis
- O&NS-mediated damage creates feed-forward loop: inflammation → ROS → ETC damage → more ROS → further CoQ10 consumption
- CoQ10 is both ETC cofactor (depleted by ETC damage) and antioxidant (consumed by ROS)

Conclusion:: Feed-forward loop between inflammation, ROS, mitochondrial damage, and CoQ10 depletion. Any chronic trigger (including persistent infection) could initiate and sustain this loop. Limitations:: Review; no direct testing of infection→CoQ10 depletion pathway. Certainty Assessment::

- *Score:* 0.60

5 Maes & Leunis 2014 — Oxidative Specific Epitopes in ME/CFS (Lipid Peroxidation Evidence)

Full Citation:: Maes M, Leunis J-C. Attenuation of autoimmune responses to oxidative specific epitopes, but not nitroso-adducts, is associated with a better clinical outcome in Myalgic Encephalomyelitis/chronic fatigue syndrome. Neuro Endocrinology Letters. 2014;35(7):577–585. (Maes and Leunis 2014) PMID:: 25617880 Study Design:: Case-control; IgM autoimmune responses to oxidative epitopes Key Findings::

- Elevated IgM against malondialdehyde (MDA)-modified adducts in ME/CFS
- MDA is a byproduct of lipid peroxidation — direct evidence of oxidative lipid damage in ME/CFS
- CoQ10 is the primary lipophilic antioxidant protecting membrane lipids — lipid peroxidation implies CoQ10 consumption
- Autoimmune responses to OSEs correlated with clinical outcome

Conclusion:: Direct evidence of oxidative lipid damage in ME/CFS. The same oxidative environment would consume CoQ10 (biochemical logic: if membranes are being peroxidized, the CoQ10 protecting them has been consumed). Limitations:: No direct CoQ10 measurement in this study; indirect evidence. Certainty Assessment::

- *Score:* 0.50

6 Schreiner et al. 2020 — HHV-6 Reactivation, Mitochondrial Fragmentation, and ROS in ME/CFS

Full Citation:: Schreiner P, Harrer T, Scheibenbogen C, Lamer S, Schlosser A, Naviaux RK, Prusty BK. Human Herpesvirus-6 Reactivation, Mitochondrial Fragmentation, and the Coordination of Antiviral and Metabolic Phenotypes in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome. ImmunoHorizons. 2020;4(4):201–215. (Schreiner et al. 2020) DOI:: 10.4049/immunohorizons.2000006 PMID:: 32327453 Study Design:: In vitro mechanistic study; U2-OS cells with chromosomally integrated HHV-6 Key Findings::

- HHV-6 reactivation induces mitochondrial fragmentation
- Metabolic shift from OXPHOS to glycolysis following viral reactivation
- Mitochondrial fragmentation increases ROS production
- Proteomic changes include altered ETC protein expression

Conclusion:: Direct mechanistic link between herpesvirus reactivation and mitochondrial dysfunction with increased ROS. HHV-6 → mitochondrial fragmentation → ROS → CoQ10 consumption. Provides the viral→oxidative pathway required by the infection-driven depletion hypothesis. Limitations:: In vitro (U2-OS cells, not patient tissue); no direct CoQ10 measurement; HHV-6 reactivation model may not fully recapitulate in vivo latency. Certainty Assessment::

- *Quality:* Medium-High (ImmunoHorizons, rigorous proteomics + microscopy)
- *Sample:* In vitro
- *Replication:* Prusty group extended findings; convergent with broader virology literature
- *Score:* 0.60

7 Maes et al. 2021 — Nomothetic Network of ME/CFS as IO&NS Disorder

Full Citation:: Maes M, Kubera M, Stoyanova K, Leunis J-C. The Reification of the Clinical Diagnosis of Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) as an Immune and Oxidative Stress Disorder. Current Topics in Medicinal Chemistry. 2021;21(16):1488–1499. (Maes et al. 2021) DOI:: 10.2174/1568026621666210727170147 PMID:: 34315375 Study Design:: PLS path analysis; nomothetic network construction Key Findings::

- Identifies bacterial translocation and autoimmune responses to OSEs as key nodes
- IO&NS pathways are central to ME/CFS pathophysiology
- Oxidative damage to lipids (consuming CoQ10) is a core network component

Conclusion:: Data-driven confirmation of IO&NS centrality in ME/CFS. Limitations:: Single cohort; PLS model depends on variable selection. Certainty Assessment::

- *Score:* 0.55

8 Al-Hakeim et al. 2023 — Oxidative Damage and Lowered Antioxidant Defenses in Long COVID

Full Citation:: Al-Hakeim HK, Al-Rubaye HT, Al-Hadrawi DS, Almulla AF, Maes M. Long-COVID post-viral chronic fatigue and affective symptoms are associated with oxidative damage, lowered antioxidant defenses and inflammation: a proof of concept and mechanism study. Molecular Psychiatry. 2023;28(2):564–578. Al-Hakeim et al. (2023) DOI:: 10.1038/s41380-022-01836-9 PMID:: 36280755 Study Design:: Cross-sectional; IO&NS markers in Long COVID Key Findings::

- Long COVID patients have increased oxidative damage (lipid peroxidation, protein oxidation)
- Lowered antioxidant defenses (includes CoQ10 pathway components)
- Acute infection severity (SpO2, peak temperature) predicts IO&NS marker elevation 3–4 months later
- Mechanism: viral infection generates sustained ROS that deplete antioxidant reserves

Conclusion:: Proof-of-concept for infection-driven antioxidant depletion in post-viral chronic fatigue. Directly relevant to ME/CFS by analogy — if SARS-CoV-2 causes sustained antioxidant depletion, other persistent pathogens (EBV, HHV-6, enteroviruses) likely do the same. Limitations:: Long COVID, not ME/CFS; cross-sectional; no direct CoQ10 measurement. Certainty Assessment::

- *Quality:* High (Molecular Psychiatry, well-powered)
- *Sample:* Moderate
- *Replication:* Single study — conceptual replication needed in ME/CFS
- *Score:* 0.65

9 Laredj et al. 2014 — Molecular Genetics of CoQ10 Biosynthesis (Competing Mechanism)

Full Citation:: Laredj LN, Licitra F, Puccio HM. The molecular genetics of coenzyme Q biosynthesis in health and disease. Biochimie. 2014;100:78–87. (Laredj, Licitra, and Puccio 2014) DOI:: 10.1016/j.biochi.2013.12.006 PMID:: 24355204 Study Design:: Comprehensive review of CoQ biosynthesis genetics Key Findings::

- Primary CoQ10 deficiency is caused by mutations in COQ1–COQ10 genes
- Tissue-specific manifestations depend on which gene is mutated
- Biosynthetic defects produce static deficiency; not driven by consumption

Conclusion:: CoQ10 deficiency can arise from genetic biosynthetic defects without any infection involvement. This is the primary competing explanation: if ME/CFS patients carry COQ gene polymorphisms, deficiency could be intrinsic rather than consumption-driven. Limitations:: Not ME/CFS-specific; no evidence that ME/CFS patients have COQ mutations. Certainty Assessment::

- *Quality:* High (Biochimie, comprehensive genetics review)
- *Sample:* N/A (review)
- *Score:* 0.70

10 Maes 2011 — Shared IO&NS Pathways in Depression and ME/CFS (Indirect Evidence)

Full Citation: Maes M. An intriguing and hitherto unexplained co-occurrence: Depression and chronic fatigue syndrome are manifestations of shared inflammatory, oxidative and nitrosative (IO&NS) pathways. Progress in Neuro-Psychopharmacology & Biological Psychiatry. 2011;35(3):784–794. (Maes 2011) DOI:: 10.1016/j.pnpbp.2010.06.023 PMID:: 20609377 Study Design: Narrative review Key Findings:

- Depression and ME/CFS share IO&NS pathway activation
- Immune-inflammatory activation → oxidative/nitrosative stress → antioxidant depletion (including CoQ10)
- Chronic inflammation creates sustained demand for antioxidant consumption

Conclusion: Provides additional indirect support: chronic inflammation (from any source including infection) depletes antioxidants including CoQ10. Limitations: Narrative review; depression-focused. Certainty Assessment:

- *Score:* 0.55

References

Al-Hakeim, Hussein Kadhem, Haneen Tahseen Al-Rubaye, Dhurgham Shihab Al-Hadrawi, Abbas F Almulla, and Michael Maes. 2023. “Long-COVID Post-Viral Chronic Fatigue and Affective Symptoms Are Associated with Oxidative Damage, Lowered Antioxidant Defenses and Inflammation: A Proof of Concept and Mechanism Study.” Molecular Psychiatry 28 (2): 564–78. https://doi.org/10.1038/s41380-022-01836-9.

Laredj, Leila N, Floriana Licitra, and Hélène M Puccio. 2014. “The Molecular Genetics of Coenzyme Q Biosynthesis in Health and Disease.” Biochimie 100: 78–87. https://doi.org/10.1016/j.biochi.2013.12.006.

Maes, Michael. 2011. “An Intriguing and Hitherto Unexplained Co-Occurrence: Depression and Chronic Fatigue Syndrome Are Manifestations of Shared Inflammatory, Oxidative and Nitrosative (IO&NS) Pathways.” Progress in Neuro-Psychopharmacology & Biological Psychiatry 35 (3): 784–94. https://doi.org/10.1016/j.pnpbp.2010.06.023.

Maes, Michael, Marta Kubera, Kristina Stoyanova, and Jean-Claude Leunis. 2021. “The Reification of the Clinical Diagnosis of Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) as an Immune and Oxidative Stress Disorder: Construction of a Data-Driven Nomothetic Network and Exposure of ME/CFS Subgroups.” Current Topics in Medicinal Chemistry 21 (16): 1488–99. https://doi.org/10.2174/1568026621666210727170147.

Maes, Michael, and Jean-Claude Leunis. 2014. “Attenuation of Autoimmune Responses to Oxidative Specific Epitopes, but Not Nitroso-Adducts, Is Associated with a Better Clinical Outcome in Myalgic Encephalomyelitis/chronic fatigue syndrome.” Neuro Endocrinology Letters 35 (7): 577–85.

Maes, Michael, Ivana Mihaylova, Marta Kubera, Marc Uytterhoeven, Nico Vrydags, and Eugene Bosmans. 2009. “Coenzyme Q10 Deficiency in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) Is Related to Fatigue, Autonomic and Neurocognitive Symptoms.” Neuro Endocrinology Letters 30 (4): 470–76.

Maes, Michael, and Frank N M Twisk. 2009. “Why Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) May Kill You: Disorders in the Inflammatory and Oxidative and Nitrosative Stress (IO&NS) Pathways May Explain Cardiovascular Disorders in ME/CFS.” Neuro Endocrinology Letters 30 (6): 677–93.

Morris, Gerwyn, George Anderson, Michael Berk, and Michael Maes. 2013. “Coenzyme Q10 Depletion in Medical and Neuropsychiatric Disorders: Potential Repercussions and Therapeutic Implications.” Molecular Neurobiology 48 (3): 883–903. https://doi.org/10.1007/s12035-013-8477-8.

Morris, Gerwyn, and Michael Maes. 2014. “Mitochondrial Dysfunctions in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome Explained by Activated Immuno-Inflammatory, Oxidative and Nitrosative Stress Pathways.” Metabolic Brain Disease 29 (1): 19–36. https://doi.org/10.1007/s11011-013-9435-x.

Schreiner, Philipp, Thomas Harrer, Carmen Scheibenbogen, Stephanie Lamer, Andreas Schlosser, Robert K Naviaux, and Bhupesh K Prusty. 2020. “Human Herpesvirus-6 Reactivation, Mitochondrial Fragmentation, and the Coordination of Antiviral and Metabolic Phenotypes in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome.” ImmunoHorizons 4 (4): 201–15. https://doi.org/10.4049/immunohorizons.2000006.