E2 ModeratePreliminaryPEM not requiredCross-SectionalPeer-reviewedReviewed
Standard · 3 min
Immunologic parameters in chronic fatigue syndrome, major depression, and multiple sclerosis.
Natelson, B H, LaManca, J J, Denny, T N et al. · The American journal of medicine · 1998 · DOI
Quick Summary
Researchers compared blood immune system markers between ME/CFS patients, people with depression, people with multiple sclerosis, and healthy controls. They measured 18 different immune system measurements, looking for signs that ME/CFS involves immune system problems. The study found only minor differences in one immune protein between ME/CFS patients and healthy controls, and these differences disappeared when comparing across all three disease groups.
Why It Matters
This study directly tested a major hypothesis in ME/CFS—that the illness involves detectable immune system dysfunction—using objective laboratory measures. The inclusion of disease comparison groups (MS and depression) strengthens the argument that any immune abnormalities found are specific to ME/CFS rather than general consequences of chronic illness or fatigue.
Observed Findings
IgG1 and IgG3 subclass levels were lower in CFS patients compared to healthy controls
The CFS subgroup with concurrent psychiatric diagnosis (axis-I disorder) showed the lowest IgG1 values
When MS and depression patient data were included in the analysis, IgG subclass differences between CFS and controls were no longer statistically significant
Only the MS patient group demonstrated evidence of immune activation (elevated proportion of CD4+ cells expressing CD45RA+ marker)
No significant differences were found in the other 16 immunologic variables studied between CFS patients and controls
Inferred Conclusions
The selected immunologic variables do not support a primary immune dysfunction or activation hypothesis in uncomplicated ME/CFS
IgG subclass reductions may represent an artifact of sample composition rather than a true disease marker
Mild/early-stage MS shows distinct immune activation patterns unlike those observed in ME/CFS
Major depression, like ME/CFS, does not show the immune activation evident in MS for the parameters studied
Remaining Questions
Why do IgG1 and IgG3 appear reduced in CFS if not reflecting immune dysfunction, and what explains the subgroup difference in patients with psychiatric comorbidity?
What This Study Does Not Prove
This study does not prove that ME/CFS has no immune component; it only found no differences in these specific 18 markers measured in blood. Cross-sectional design prevents conclusions about causation or disease progression, and the study cannot rule out immune dysfunction in tissues, at the cellular level, or in immune functions not measured here. The lack of significant findings may reflect limitations in which immune parameters were selected rather than absence of immune involvement.
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 →
Contribute
Private, reviewed by a human. Not a public comment thread.
Do other immune parameters not measured in this study (cytokines, T-cell function assays, tissue-specific immune responses) show abnormalities in ME/CFS?
How do findings in blood-based markers relate to potential immune dysregulation in lymphoid tissues or at mucosal surfaces?
Could longitudinal assessment reveal immune changes that are not apparent in cross-sectional analysis?