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Immunological changes in primary HIV-1 infection

H Gaines1, M A von Sydow, L V von Stedingk

  • 1Virological Department, Central Microbiological Laboratory, Stockholm, Sweden.

AIDS (London, England)
|October 1, 1990
PubMed

Insights

Primary HIV-1 infection in homosexual men causes significant immune cell loss, particularly CD4+ T-cells. Immune responses are mounted, but cell counts and ratios may not fully recover, indicating chronic active infection.

Area of Science:

  • Immunology
  • Virology
  • Infectious Diseases

Background:

  • Symptomatic primary HIV-1 infection significantly impacts immune cell populations.
  • Understanding early immune dynamics is crucial for managing HIV-1 progression.

Purpose of the Study:

  • To characterize the temporal changes in immune cell counts during acute HIV-1 infection.
  • To investigate early host response markers and long-term immune recovery.

Main Methods:

  • Longitudinal monitoring of CD3+, CD4+, CD8+ T-cells, B cells, and activated lymphocytes.
  • Measurement of interferon-alpha, neopterin, and beta 2-microglobulin (beta 2-M) levels.

Main Results:

  • Pronounced lymphopenia (CD3+, CD4+, CD8+, B cells) observed in the first week.
  • CD8+ cell counts increased with immune activation markers, while CD4+ and B cells remained low.
  • Elevated interferon-alpha, neopterin, and beta 2-M indicated early host response.
  • CD4+/CD8+ ratio and beta 2-M did not normalize within 2 years.

Conclusions:

  • Early HIV-1 infection triggers significant immune cell depletion and activation.
  • The immune system mounts a response, but long-term recovery is incomplete.
  • HIV-1 infection likely progresses to a chronic active stage post-acute illness.

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