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Complement System01:27

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The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a...
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Related Experiment Video

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Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells
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Levels of Complement Components in Children With Acute COVID-19 or Multisystem Inflammatory Syndrome.

Anuradha Rajamanickam1, Pavan Kumar Nathella2, Aishwarya Venkataraman2

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Summary

Multisystem inflammatory syndrome in children (MIS-C) and acute COVID-19 are linked to overactive complement systems. This suggests complement inhibition may be a future treatment strategy for these conditions in children.

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Area of Science:

  • Immunology
  • Pediatrics
  • Infectious Diseases

Background:

  • Multisystem inflammatory syndrome in children (MIS-C) is a severe post-SARS-CoV-2 inflammatory condition.
  • The complement system, a key part of innate immunity, plays a role in COVID-19 pathogenesis.

Purpose of the Study:

  • To compare complement component and activation product levels in children with MIS-C, acute COVID-19, convalescent COVID-19, and controls.
  • To investigate the association between complement system activation and disease severity in pediatric SARS-CoV-2 infections.

Main Methods:

  • A cross-sectional study involving 145 children (aged 1-18 years) in India.
  • Analysis of complement components, regulators, and activation products using Mann-Whitney U, Kruskal-Wallis, and Spearman rank correlation tests.

Main Results:

  • Children with MIS-C and acute COVID-19 exhibited significantly higher levels of multiple complement components (C1q, C2, C3, C4b, C5, C5a, C3b/iC3b) and factors (B, D, H) compared to controls.
  • MIS-C patients showed higher C3, C5a, and mannose-binding lectin levels than those with acute COVID-19.
  • Elevated analyte levels correlated with increased disease severity, including need for pediatric intensive care unit (PICU) support.

Conclusions:

  • The complement system is implicated in the pathogenesis of MIS-C and COVID-19 in children.
  • Findings support further exploration of complement inhibition as a potential therapeutic strategy for pediatric MIS-C and COVID-19.