Skin Temperature Circadian Rhythms and Dysautonomia in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome: The Role of Endothelin-1 in the Vascular Tone Dysregulation. — CFSMEATLAS
Skin Temperature Circadian Rhythms and Dysautonomia in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome: The Role of Endothelin-1 in the Vascular Tone Dysregulation.
Cambras, Trinitat, Zerón-Rugerio, Maria Fernanda, Díez-Noguera, Antoni et al. · International journal of molecular sciences · 2023 · DOI
Quick Summary
This study looked at how the bodies of people with ME/CFS respond to position changes and whether problems with their blood vessel function might be involved. Researchers compared 67 women with ME/CFS to 48 healthy women, measuring their blood pressure, heart rate, body temperature patterns, and blood markers related to blood vessel health. They found that people with ME/CFS had higher blood pressure and heart rate, disrupted daily temperature rhythms, and elevated levels of substances in the blood that suggest blood vessel problems.
Why It Matters
This research identifies potential biological mechanisms underlying dysautonomia in ME/CFS—specifically endothelial dysfunction and vascular tone dysregulation—which could explain symptoms like orthostatic intolerance and abnormal temperature regulation. Understanding these mechanisms may lead to targeted therapeutic approaches and validates autonomic abnormalities as a core ME/CFS feature worthy of clinical investigation.
Observed Findings
ME/CFS patients had higher systolic and diastolic blood pressure in both supine and standing positions compared to controls
Circulating endothelin-1 and VCAM-1 levels were significantly elevated in ME/CFS patients
ME/CFS patients showed higher amplitude variation in daily activity rhythms
Endothelin-1 levels correlated with the stability of peripheral temperature circadian rhythms
Endothelin-1 levels correlated with symptom severity on self-reported questionnaires
Inferred Conclusions
Endothelial dysfunction, marked by elevated ET-1 and VCAM-1, is associated with dysautonomia and circadian rhythm abnormalities in ME/CFS
Vascular tone dysregulation may be a key mechanism underlying the hemodynamic and circadian abnormalities observed in ME/CFS
Endothelin-1 may represent a potential therapeutic target for treating autonomic and temperature regulation dysfunction in ME/CFS
Remaining Questions
Does endothelin-1 elevation cause dysautonomia in ME/CFS, or is it a secondary consequence of the disease?
How do these vascular and autonomic abnormalities relate to post-exertional malaise and exercise intolerance?
What This Study Does Not Prove
This study does not prove that endothelin-1 causes ME/CFS or dysautonomia, only that elevated levels are associated with the condition. The cross-sectional design cannot establish temporal relationships or causality. Results apply primarily to women and cannot be generalized to male or pediatric ME/CFS populations without further research.