Herpesvirus Infection of Endothelial Cells as a Systemic Pathological Axis in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome.
Nunes, Jean M, Kell, Douglas B, Pretorius, Etheresia · Viruses · 2024 · DOI
Quick Summary
This review examines the theory that a common virus family (herpesviruses) may infect the blood vessel lining in ME/CFS patients, potentially causing the disease's widespread symptoms. When these viruses damage blood vessels, they may disrupt blood flow, increase clotting problems, and affect brain function—all hallmarks of ME/CFS. The researchers suggest this endothelial (blood vessel) damage could explain why ME/CFS is chronic and affects multiple body systems.
Why It Matters
This hypothesis-generating review offers a potentially unifying mechanistic explanation for ME/CFS's heterogeneous symptom profile and multisystem involvement, which could redirect clinical research toward targeted antiviral or endothelial-protective therapies. Understanding the role of persistent herpesvirus infection in endothelial dysfunction may also illuminate overlaps with Long COVID and inform prevention or treatment strategies.
Observed Findings
Herpesviruses (particularly CMV, EBV, and HHV-6) can establish latent and productive infections in endothelial cells in vitro and in vivo.
Endothelial cell infection by herpesviruses impairs vasodilatory function, disrupts barrier integrity, and activates prothrombotic pathways.
ME/CFS patients demonstrate evidence of systemic endothelial dysfunction, including abnormal blood flow regulation, coagulation activation, and microvascular pathology.
Long COVID shares phenotypic similarities with ME/CFS, including endothelial dysfunction and potential herpesvirus reactivation.
Chronic herpesvirus infection can induce long-term maladaptive changes in infected cell populations through latency modulation and persistent immune activation.
Inferred Conclusions
Herpesvirus-induced endothelial infection may represent a unifying systemic pathological axis explaining ME/CFS's multisystem symptomatology and chronicity.
Endothelial cell dysfunction secondary to herpesvirus infection could account for key pathophysiological features observed in ME/CFS, including dysregulated perfusion, prothrombotic state, and cognitive impairment.
Future research must establish the prevalence and viral load of herpesviruses specifically within endothelial compartments of ME/CFS patients to test this model.
Remaining Questions
Is the prevalence of active or latent herpesvirus infection higher in endothelial cells from ME/CFS patients compared to healthy controls?
What This Study Does Not Prove
This review does not establish that herpesviruses are actually present in or infecting endothelial cells in ME/CFS patients—it is a hypothesis-building synthesis rather than original research with patient data. Correlation between herpesvirus serology and endothelial markers in ME/CFS has not been formally demonstrated in this review. The mechanism remains theoretical and requires prospective studies with direct measurement of viral load and endothelial injury in patient populations.