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Combined decrease of defined B and T cell subsets in a group of common variable immunodeficiency patients.

Daniele Moratto1, Anna Virginia Gulino, Stefania Fontana

  • 1Istituto di Medicina Molecolare "Angelo Nocivelli", Clinica Pediatrica, Universita' di Brescia, Spedali Civili, Piazzale Spedali Civili 1, 25123 Brescia, Italy. daniele.moratto@gmail.com

Clinical Immunology (Orlando, Fla.)
|September 12, 2006
PubMed
Summary

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This summary is machine-generated.

Common variable immunodeficiency disease (CVID) involves B cell defects and infections. Some CVID patients show expanded abnormal B cells (CD19(hi)/CD21(lo)) linked to reduced T cells, suggesting a combined immune cell generation defect.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Common variable immunodeficiency disease (CVID) is a primary immune disorder characterized by hypogammaglobulinemia and recurrent infections.
  • CVID exhibits significant clinical and immunological heterogeneity among patients.

Purpose of the Study:

  • To investigate the immunological heterogeneity of CVID by analyzing B and T cell subsets in 25 patients.
  • To identify distinct B and T cell subpopulations associated with specific CVID phenotypes.

Main Methods:

  • Flow cytometry analysis of B and T cell subsets in 25 CVID patients.
  • Characterization of B cell subpopulations based on CD19, CD21, CD23, CXCR5, and CCR7 expression.
  • Assessment of naïve and memory B and T lymphocytes, including CD4+ T cells and T cell receptor excision circles (TRECs).

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Main Results:

  • Eleven CVID patients exhibited a relative expansion of CD19(hi)/CD21(lo) B cells, lacking CD23 and showing reduced CXCR5/CCR7.
  • This B cell expansion correlated with a decrease in circulating naïve and CD21(hi) memory B cells.
  • These patients also showed a severe reduction in naïve CD4+ T cells and decreased TREC levels.

Conclusions:

  • A subgroup of CVID patients presents with a distinct immunophenotype characterized by expanded CD19(hi)/CD21(lo) B cells.
  • The findings suggest a potential combined defect in the generation of both B and T cell subpopulations in this CVID subgroup.
  • This combined defect may contribute to the observed immunological abnormalities and clinical heterogeneity in CVID.