Selective depletion of Vβ2+CD8+ T cells in peripheral blood from rheumatic heart disease patients

F. Carrión, M. Fernandez, M. Iruretagoyena, L. E. Coelho Andrade, M. Odete-Hilário, Fernando Figueroa

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Acute rheumatic fever (ARF) and its chronic valvular sequelae are the delayed consequence of a pharyngeal infection with group A Streptococcus (GAS). Several GAS proteins have been shown to be superantigens, raising the possibility that the expansion or deletion of T cells expressing specific Vβ regions might play a role in the pathogenesis of ARF or chronic rheumatic heart disease (RHD). We therefore analyzed by four-color flow cytometry, the Vβ repertoire on CD3, CD4 and CD8 T cells from four ARF patients, 10 RHD patients and also nine healthy controls. A selective depletion of Vβ2+ T cells was found only in the CD8 subset of chronic RHD patients. This is of interest since a number of GAS superantigens exert their effects on Vβ2+ cells and because only CD8+ T cells from ARF and RHD patients undergo anergy in response to GAS superantigens. Our results suggests that an ongoing immune process is present in RHD patients and that CD8+ T cells may have an important immunoregulatory role in the pathogenesis of the disease.

Original languageEnglish
Pages (from-to)183-190
Number of pages8
JournalJournal of Autoimmunity
Volume20
Issue number2
DOIs
StatePublished - Mar 2003

Bibliographical note

Funding Information:
This work was supported by grant 1960117 from Fondecyt and Universidad de los Andes MED-002-98.

Keywords

  • Rheumatic fever
  • Rheumatic heart disease
  • Superantigens
  • T cells
  • T-cell receptor

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