Neuroimmune mechanisms in health and disease: 2. Disease.
Anisman, H, Baines, M G, Berczi, I et al. · CMAJ : Canadian Medical Association journal = journal de l'Association medicale canadienne · 1996
Quick Summary
When your body fights an infection, your immune system releases chemical messengers called cytokines that trigger fatigue, fever, loss of appetite, and inactivity—changes controlled partly by your brain and nervous system. This review explains how problems in the communication between your immune system and brain (particularly an area called the hypothalamus-pituitary-adrenal axis) may contribute to chronic conditions including ME/CFS, fibromyalgia, and autoimmune diseases. Understanding these connections could lead to new treatments using hormones and other brain-signaling molecules.
Why It Matters
This early comprehensive review directly addresses neuroimmune dysfunction in ME/CFS and proposes that HPA axis defects and altered hormone signaling are central mechanisms—a framework that has guided decades of subsequent ME/CFS research. For patients, it explains why brain-immune communication problems might cause both the fatigue during illness and chronic symptoms, and it suggests specific biological targets (hormones, neurotransmitters) for future treatments.
Observed Findings
HPA axis abnormalities have been documented in CFS, fibromyalgia, autoimmune diseases, and chronic inflammatory disorders.
Prolactin levels are elevated in systemic lupus erythematosus and some autoimmune diseases; prolactin bioactivity is reduced in rheumatoid arthritis.
Sex hormone and thyroid hormone levels decrease during severe inflammatory disease.
Immune-derived cytokines during acute febrile illness induce fatigue, inactivity, fever, anorexia, and metabolic changes.
Defective neural regulation of inflammation is implicated in allergy, asthma, rheumatoid arthritis, and gastrointestinal inflammatory disease.
Inferred Conclusions
Regulatory defects in immune and inflammatory diseases may reside in the immune system, neuroendocrine system, or both.
Neuroimmune dysregulation, particularly involving the HPA axis and prolactin signaling, is a putative mechanism in ME/CFS and related chronic conditions.
Modulation of neuroimmune regulators—hormones, neurotransmitters, and neuropeptides—may offer therapeutic strategies for immune and inflammatory diseases.
Remaining Questions
Which neuroimmune defects are primary drivers versus secondary consequences of chronic illness in ME/CFS?
What This Study Does Not Prove
This is a narrative review of existing literature, not original research, so it does not provide new experimental data or patient cohorts demonstrating causation. The authors do not prove that neuroimmune dysfunction *causes* ME/CFS—they describe associations and propose mechanisms that require testing. The review predates modern biomarker validation and does not establish which neuroimmune defects are primary versus secondary effects of chronic illness.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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