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Clinical and laboratory aspects of common variable immunodeficiency

Cristina M Kokron1, Paolo R Errante, Myrthes T Barros

  • 1Serviço de Imunologia, Av. Dr. Anéas de Carvalho Aguilar, 155, 8 andar, bloco 3, 05403-010 São Paulo, SP, Brazil.

Anais Da Academia Brasileira De Ciencias
|November 24, 2004
PubMed

Insights

Common variable immunodeficiency (CVID) impairs antibody production, leading to infections. Brazilian CVID patients exhibit reduced T and B cells, increased lymphocyte apoptosis, and lower activation molecule expression, impacting cellular immunity.

Area of Science:

  • Immunology
  • Clinical Medicine

Background:

  • Common variable immunodeficiency (CVID) is a primary immunodeficiency characterized by impaired antibody production, recurrent infections, autoimmune disorders, and increased cancer risk.
  • CVID can involve cellular immune disturbances, including altered lymphocyte counts, reduced proliferation, cytokine dysregulation, and deficient cell-surface molecule expression.

Purpose of the Study:

  • To investigate immunological disturbances in Brazilian CVID patients.
  • To correlate these immunological findings with clinical features and compare them with existing literature.

Main Methods:

  • Analysis of T and B lymphocyte counts in peripheral blood.
  • Assessment of lymphocyte apoptosis susceptibility following activation.
  • Evaluation of activation molecule expression (CD25, CD69, CD40L, CD70).
  • Measurement of cytokine synthesis (IL-4, IL-5).

Main Results:

  • Brazilian CVID patients showed decreased T and B lymphocyte counts.
  • Lymphocytes from CVID patients were more susceptible to apoptosis after activation.
  • Reduced expression of activation molecules (CD25, CD69, CD40L, CD70) was observed.
  • Decreased synthesis of IL-4 and IL-5 was noted in CVID patients compared to controls.

Conclusions:

  • Increased lymphocyte apoptosis following activation may explain reduced activation molecule expression, decreased Th2 cytokine synthesis, and lower circulating T and B cell counts in these CVID patients.
  • These immunological findings contribute to understanding the pathophysiology of CVID and its clinical manifestations.

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