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Related Experiment Video

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A Murine Model of Dengue Virus-induced Acute Viral Encephalitis-like Disease
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Published on: April 28, 2019

Alternative complement pathway deregulation is correlated with dengue severity.

Eduardo J M Nascimento1, Ana M Silva, Marli T Cordeiro

  • 1Division of Infectious Diseases, Department of Medicine, The Johns Hopkins School of Medicine, Baltimore, Maryland, USA.

Plos One
|August 27, 2009
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Summary

Complement system activation is linked to dengue severity. Dengue hemorrhagic fever patients show abnormal regulation of complement factors D and H, favoring overactivation and disease progression.

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Area of Science:

  • Immunology
  • Virology
  • Biochemistry

Background:

  • The complement system bridges innate and adaptive immunity via classical, lectin, and alternative pathways.
  • Complement activation levels correlate with disease severity in dengue fever (DF) and dengue hemorrhagic fever (DHF).

Purpose of the Study:

  • To investigate complement component levels in DF and DHF patients.
  • To determine the association between complement activation and dengue disease severity.

Main Methods:

  • Analysis of complement components (C3, C3a, C4a, C5a, C1q, MBL, Factor D, Factor H) in blood samples from DF and DHF patients.
  • Assessment of immunocomplexes (CIC-CIq) and C-reactive protein (CRP) levels.
  • Evaluation of alternative pathway regulatory proteins (Factor D and Factor H) and their impact on C3 convertase formation.

Main Results:

  • DHF patients exhibited lower complement factor 3 (C3) and higher C3a, C4a, and C5a levels than DF patients.
  • Significant differences in Mannose-binding lectin (MBL) levels were observed.
  • DHF patients showed higher Factor D and lower Factor H levels, indicating a shift favoring C3 convertase formation compared to DF patients.

Conclusions:

  • An imbalance in regulatory factors D and H is associated with dysregulated complement activity in DHF.
  • This dysregulation may contribute to the increased severity observed in dengue hemorrhagic fever.