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Arenaviral haemorrhagic fevers.

D Cummins1

  • 1Department of Haematology, Edgware General Hospital, London, UK.

Blood Reviews
|September 1, 1991
PubMed
Summary

Arenaviruses like Lassa, Junin, and Machupo cause severe hemorrhagic fevers. Plasma inhibitors in patients with these diseases disrupt platelet function and neutrophil activity, impacting cellular health.

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Area of Science:

  • Virology
  • Immunology
  • Pathogenesis

Background:

  • Arenaviruses, including Lassa, Junin, and Machupo, cause severe hemorrhagic fevers with significant public health and economic impact.
  • These diseases present with influenza-like symptoms, progressing to bleeding diathesis, encephalopathy, and potentially death.
  • Cellular dysfunction, disproportionate to histopathology, is a key feature in arenavirus pathogenesis.

Purpose of the Study:

  • To investigate the role of cellular dysfunction in arenavirus-induced hemorrhagic diseases.
  • To identify potential inhibitory factors in patient plasma affecting cellular function.

Main Methods:

  • Analysis of platelet function in Lassa fever patients.
  • Detection of inhibitory plasma factors in patients with Lassa and Argentine hemorrhagic fevers.
  • Assessment of neutrophil superoxide generation in response to chemotactic peptides in Lassa fever patients.

Main Results:

  • Platelet dysfunction, potentially mediated by an unknown plasma inhibitor, contributes to bleeding tendencies in Lassa fever.
  • A similar plasma inhibitor was identified in patients with Argentine hemorrhagic fever.
  • Plasma from Lassa fever patients significantly altered neutrophil superoxide generation, indicating broader cellular effects.

Conclusions:

  • Plasma-derived inhibitory factors play a crucial role in the pathogenesis of arenavirus hemorrhagic fevers.
  • These inhibitors appear to affect multiple cell types, including platelets and neutrophils.
  • Understanding these cellular dysfunctions may lead to novel therapeutic strategies for hemorrhagic fevers.

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