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Lymphocyte and NK cell subpopulations in HIV seronegative Thais

Sujin Assawawitoontip1, Pilaipan Puthavathana, Kovit Pattanapanyasat

  • 1Department of Microbiology, Mahidol University, Thailand.

Asian Pacific Journal of Allergy and Immunology
|November 25, 2003
PubMed

Insights

This study found that HIV-negative Thai adults often have low CD4 counts but high natural killer (NK) cell counts. These findings suggest NK cells may compensate for lower CD4 cell counts in certain populations.

Area of Science:

  • Immunology
  • Virology
  • Hematology

Background:

  • Human immunodeficiency virus (HIV) infection is characterized by a decline in CD4+ T-lymphocyte counts.
  • Natural killer (NK) cells play a crucial role in innate immunity against viral infections.
  • Understanding lymphocyte dynamics in HIV-seronegative individuals can provide insights into immune responses.

Purpose of the Study:

  • To enumerate lymphocyte subpopulations, including T, B, and NK cells, in HIV-seronegative Thai adults.
  • To investigate potential correlations between CD4 counts, NK cell levels, and demographic factors like sex and age.
  • To explore the role of NK cells in immune defense, particularly in the context of potential viral infections.

Main Methods:

  • Two-color flow cytometry was used to enumerate lymphocyte subsets.
  • A cohort of 125 HIV-seronegative Thai adults was analyzed.
  • Statistical analyses were performed to assess differences based on sex and age.

Main Results:

  • A significant proportion (26.3%) of participants had CD4 counts below 500 cells/microliter.
  • Participants exhibited relatively high NK cell counts.
  • Females showed higher CD3 (total T cells) counts but lower NK cell counts compared to males (p < 0.05).
  • An increase of 1.1% in CD4 cells per decade was observed.
  • Approximately 86% of NK cells expressed both CD16 and CD56 molecules.

Conclusions:

  • High NK cell counts may serve as a compensatory mechanism for low CD4 cell counts in individuals of Mongoloid descent.
  • The findings highlight the potential importance of NK cells in the immune defense against viral infections, including HIV.
  • Further research is warranted to elucidate the precise role of NK cells in the immune cascade against HIV infection.

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