Dengue Literature Review

Palacios2016 - Autoimmunity in Dengue Literature Review

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Palacios2016 - Autoimmunity in Dengue Literature Review

Full citation: Palacios-Cuervo F, Calderón-Rivera A, Espinal-Reyes F, Canelo-Aybar C. Autoimmunity in Dengue: Literature Review. Reumatol Clin. 2016;12(3):173–174. https://doi.org/10.1016/j.reumae.2015.05.015

Raw file: [[raw/Palacios2016.pdf]]

Summary

This is a letter to the editor (2 pages) authored by researchers at Universidad Peruana de Ciencias Aplicadas (Lima, Peru), written in direct response to Morel2014 - Autoimmune Response in Children With Dengue. It does not present original data — instead, it contextualises the Morel2014 case series within the broader dengue-autoimmunity literature, adding several case reports and mechanistic studies not cited in Morel2014. Its contribution to the wiki is as a secondary synthesis pointing toward additional clinical phenomena (dengue-triggered SLE, lupus nephritis, retinal vasculitis, MAS with nephrotic syndrome) and affirming that autoantibody production is a consistent feature across serotypes and severity categories.

The letter endorses Morel2014’s general conclusion that dengue can trigger clinically significant autoimmunity and calls for larger endemic-population studies to characterise this relationship. It does not directly address or resolve the ANA-negative MAS finding in Morel2014.

Study Design

  • Type: Letter to the editor / brief unsystematic literature review
  • Sample size: No original data; references 8 published papers beyond Morel2014
  • Setting: Written from Peru; papers cited are from multiple countries
  • Population: Narrative review; no patient selection criteria

Key Findings

Autoimmune manifestations catalogued beyond Morel2014:

  • MAS + nephrotic syndrome (Lai et al. 2012, France): A 55-year-old woman with neutropenia, lymphopenia, and hemophagocytosis on myelogram. During hospitalisation, diagnosed with nephrotic syndrome. Dengue confirmed by NS1 antigen positive AND positive IgG and IgM serology (indicating reinfection).

  • SLE + lupus nephritis triggered by DV (Talib et al. 2013): NS1 antigen positive; patient met 4 of 11 ACR SLE criteria including ANA with homogeneous pattern and positive anti-dsDNA — a case with POSITIVE ANA in contrast to Morel2014’s cases. The authors note the diagnosis could alternatively represent renal disease from p-ANCA positivity or a lupus flare rather than de novo disease.

  • Retinal vasculitis (Chang et al. 2007, Singapore): DV infection in young women provoked antibody production and immune complex deposition, leading to retinal vasculitis — an ophthalmological dengue complication mediated by immune complex deposition.

Autoantibody–severity correlation (citing Wan2012, already in wiki):

  • Anti-endothelial cell antibody titres (measured by flow cytometry) peak during the acute phase and decrease subsequently, but remain detectable for several months — a prolonged persistence distinct from other chronic infections
  • These autoantibody levels are higher in DHF/DSS than in DF — a severity correlation
  • Autoantibody levels are similar across serotypes DENV-2, 3, and 4 — no serotype-specific autoimmune signature among these three
  • Note: These “autoantibodies” are anti-endothelial cell Abs by flow cytometry (Wan2012 methodology), NOT standard ANA/anti-dsDNA as tested in Morel2014. The distinction is methodologically important.

Persistence of clinical symptoms and ANA (citing Garcia2009, already in wiki):

  • Cited study (Garcia2009) reported persistence of clinical symptoms 2 years after acute infection, associated with persistently high IgG levels and FcγRIIa polymorphism expression, together with positive ANA or rheumatoid factor, elevated immune complexes, or high CRP.

Conclusions:

  • DV infection should be included in the differential diagnosis of any systemic disease in endemic areas, particularly in the paediatric population
  • Calls for larger studies in endemic populations to characterise the long-term autoimmune consequences of dengue

Methods Used

No original methods — letter cites others’ methodologies. The following are referenced:

Entities Mentioned

Concepts Addressed

Relevance & Notes

Palacios2016 is useful primarily as a navigator to clinical case reports not previously in the wiki — the SLE+lupus nephritis (Talib 2013), MAS+nephrotic syndrome (Lai 2012), and retinal vasculitis (Chang 2007) cases expand the known spectrum of dengue-autoimmune clinical presentations. However, these are all cited case reports, not Palacios’ own data.

The core tension with Morel2014 (the paper it responds to): Palacios cites Wan2012’s finding that autoantibody levels are higher in DHF/DSS than in DF, implying autoantibodies track severity. Morel2014’s MAS cases had negative standard ANA/anti-dsDNA despite being the most severe cases in the series. This apparent contradiction resolves when the autoantibody types are distinguished: Wan2012 measured anti-endothelial cell Abs by flow cytometry; Morel2014 tested standard ANA/anti-dsDNA by serology. These detect entirely different populations of antibodies. Additionally, MAS/HLH is mechanistically macrophage and CD8+ T cell-driven — it is not primarily an autoantibody-mediated syndrome.

The Talib (2013) SLE case cited by Palacios is notable as a positive ANA in dengue case with a relatively complete characterisation (homogeneous ANA pattern, anti-dsDNA positive, 4 ACR criteria), in direct contrast with Morel’s ANA-negative cases. However, the Talib case is a single case report and the Palacios authors themselves note the diagnosis may represent pre-existing or cryptic SLE triggered into flare, rather than de novo disease.

Limitation: Not a systematic review; case selection is unsystematic and publication-biased toward dramatic or unusual presentations. The letter format limits methodological depth. No denominator or prevalence data.

Questions Raised

  • The Talib SLE case has ANA positive with homogeneous pattern and anti-dsDNA positive — while Morel’s cases are ANA negative. Does the Talib case represent dengue triggering pre-existing (subclinical) SLE into flare, or true de novo lupus induction by dengue?
  • Does dengue-associated retinal vasculitis operate via the same immune complex deposition mechanism as seen in non-dengue viral retinal vasculitis, or is there a dengue-specific (NS1-mediated) component?
  • Given the Wan2012 data that autoantibody levels are similar across DENV-2, 3, and 4, does DENV-1 (dominant in the Singapore outbreak per Seet2007) show a different autoantibody profile?

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