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Ethnicity and difference in dengue virus-specific memory T cell responses in Cuban individuals

Beatriz de la C Sierra1, Gissell García, Ana B Pérez

  • 1Immunology Laboratory and Arbovirus Laboratory, Department of Virology, Pedro Kourí Institute of Tropical Medicine, La Lisa, Havana, Cuba. siebet@ipk.sld.cu

Viral Immunology
|January 5, 2007
PubMed

Insights

Ethnicity influences dengue hemorrhagic fever risk. White individuals exhibit a stronger T cell response to dengue viruses than black individuals, potentially explaining lower severe dengue risk in Black populations.

Area of Science:

  • Immunology
  • Epidemiology
  • Virology

Background:

  • Dengue hemorrhagic fever (DHF) pathogenesis involves complex risk factors.
  • Cuba's unique epidemiological history provides a distinct setting for studying DHF.
  • Previous dengue virus (DENV) infections can influence subsequent immune responses.

Purpose of the Study:

  • To investigate the role of ethnicity in memory T cell responses to dengue virus.
  • To explore potential immunopathogenic mechanisms underlying ethnic variations in DHF severity.
  • To correlate T cell responses with epidemiological observations of DHF risk across ethnic groups.

Main Methods:

  • Examined memory T cell responses (CD4+ T lymphocyte proliferation and interferon-gamma release) in 80 Cuban donors.
  • Donors had prior infections with dengue-1 and dengue-2 viruses from 1977 and 1981 epidemics.
  • Compared immune responses between individuals of different ethnic groups (White and Black).

Main Results:

  • White individuals demonstrated significantly stronger, cross-reactive dengue virus-specific memory CD4+ T cell proliferation compared to Black individuals.
  • Elevated interferon-gamma release was observed in White individuals' T cells following dengue virus stimulation.
  • A notable variation in T cell response was identified based on participant ethnicity.

Conclusions:

  • Ethnic differences in T cell responses to dengue viruses may contribute to DHF immunopathogenesis.
  • The observed immune response variations could partially explain why Black individuals have a lower risk of severe dengue clinical courses.
  • Further research into host genetics and immune responses is warranted to understand DHF epidemiology.

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