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Th1 versus Th2 responses in AIDS

S Romagnani1, E Maggi

  • 1Istituto di Clinica Medica 3, University of Florence, Italy.

Current Opinion in Immunology
|August 1, 1994
PubMed
Summary
This summary is machine-generated.

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The progression of HIV to AIDS may not involve a T-helper 1 (Th1) to T-helper 2 (Th2) switch in most cases. However, chronic Th2 responses in HIV patients might accelerate disease progression.

Area of Science:

  • Immunology
  • Virology
  • Infectious Diseases

Background:

  • A prevailing theory suggests HIV progression to AIDS involves a shift from T-helper type 1 (Th1) to T-helper type 2 (Th2) immune responses.
  • This theory has gained traction over the past two years as a potential explanation for disease advancement in HIV-infected individuals.

Purpose of the Study:

  • To evaluate the experimental evidence supporting the Th1/Th2 switch theory in the context of HIV disease progression.
  • To explore alternative mechanisms or specific conditions under which immune response shifts might influence HIV pathogenesis.

Main Methods:

  • Review and analysis of existing experimental data pertaining to immune responses in HIV-infected subjects.
  • Comparison of immune profiles across different stages of HIV infection and disease progression.

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Main Results:

  • The majority of experimental data do not support a widespread Th1/Th2 immune switch as the primary driver of HIV progression to AIDS.
  • Sustained and chronic Th2-type responses, potentially exacerbated by co-infections like allergic disorders or helminthic infestations, may be linked to faster HIV replication.

Conclusions:

  • The widely accepted Th1/Th2 switch theory is not supported by current experimental data for most HIV-infected individuals.
  • Specific immune profiles, particularly chronic Th2 skewing due to external factors, might represent a distinct pathway for accelerated HIV pathogenesis and progression to AIDS.