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HLA class II DRB1, DQB1, DPB1 polymorphism and cardiomyopathy due to Trypanosoma cruzi chronic infection

I A Colorado1, H Acquatella, F Catalioti

  • 1Instituto Venezolano de Investigaciones Cientificas (IVIC), Laboratorio de Fisiopatologia, Caracas and Centro de Investigaciones Jose Francisco Torrealba, San Juan de Los Morros, Venezuela.

Human Immunology
|February 26, 2000
PubMed

Insights

Human leukocyte antigen (HLA) alleles are associated with Chagas disease cardiomyopathy risk. Specific HLA class II alleles, particularly DPB1*0401 combinations, significantly increase the risk of developing heart damage in Trypanosoma cruzi infected individuals.

Area of Science:

  • Immunogenetics
  • Cardiology
  • Infectious Diseases

Background:

  • Chagas disease, caused by Trypanosoma cruzi, is a major cause of cardiomyopathy in Latin America.
  • Human leukocyte antigen (HLA) molecules play a role in regulating the immune response to T. cruzi infection.
  • Previous research suggests an association between specific HLA antigens and the development of heart damage in Chagas disease patients.

Purpose of the Study:

  • To investigate the association between HLA class II alleles and the clinical manifestations of Chagas disease cardiomyopathy.
  • To identify specific HLA alleles or haplotypes that confer susceptibility or protection against heart damage in T. cruzi infected individuals.

Main Methods:

  • Genotyping of HLA class II alleles using the polymerase chain reaction and sequence specific oligonucleotide (PCR-SSO) method in 111 T. cruzi antigen-seropositive individuals.
  • Classification of patients into three groups: asymptomatic, with arrhythmia, and with overt congestive heart failure.
  • Statistical analysis to determine the association between HLA alleles/haplotypes and clinical groups.

Main Results:

  • The DRB1*01 DQB1*0501 haplotype was significantly increased in patients with cardiomyopathy (p = 0.03).
  • The DPB1*0401 allele frequency was significantly higher in patients with heart disease (groups B + C) (p = 0.009), while DPB1*0101 was more frequent in asymptomatic individuals (p = 0.04).
  • A combination of specific DPB1*0401 alleles conferred a 6.55-fold increased risk of developing cardiomyopathy (p = 0.041).

Conclusions:

  • Specific HLA class II alleles and haplotypes are associated with the development of Chagas disease cardiomyopathy.
  • The DPB1*0401 allele, particularly in certain combinations, is a significant risk factor for heart damage.
  • These findings highlight the role of immunogenetics in the susceptibility to Chagas disease cardiomyopathy and may inform future diagnostic or therapeutic strategies.

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