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Related Experiment Videos

Influenza: pathogenesis and host defense.

B S Bender1, P A Small

  • 1Geriatric Research, Education and Clinical Center, Veterans Affairs Medical Center, Gainesville, FL 32608-1197.

Seminars in Respiratory Infections
|March 11, 1992
PubMed
Summary
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Antibody prevents influenza infection, while cytotoxic T-lymphocytes (CTLs) are crucial for recovery. Aging impairs CTL activity, leading to prolonged viral shedding and increased spread.

Area of Science:

  • Immunology
  • Virology
  • Respiratory Medicine

Background:

  • Influenza pathogenesis and host defense are studied in humans and animal models.
  • Viral entry into the respiratory tract depends on hemagglutinin binding to cellular receptors.
  • Antibody primarily prevents influenza disease, while cytotoxic T-lymphocytes (CTLs) are essential for viral clearance.

Purpose of the Study:

  • To elucidate the distinct roles of antibody and CTLs in influenza host defense.
  • To investigate the impact of aging on immune responses to influenza.

Main Methods:

  • Studies utilizing animal models, including nude (athymic) mice.
  • Administration of anti-influenza antibodies and CTLs.
  • Assessment of viral shedding and respiratory tract pathology.

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Main Results:

  • Antibody administration prevents pneumonia but not rhinotracheitis; IgA protects the nasopharynx.
  • CTL activity is necessary and sufficient for influenza recovery, clearing virus from the lungs.
  • Nude mice infected with influenza shed virus indefinitely without CTL transfer.
  • Aging is associated with decreased CTL activity, resulting in prolonged viral shedding and spread.

Conclusions:

  • Antibody is critical for preventing influenza infection and disease.
  • Cytotoxic T-lymphocytes are indispensable for resolving influenza infection.
  • Age-related decline in CTL function contributes to severe influenza outcomes in the elderly.