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. 2016 Apr-Jun;63(2):163-8.
doi: 10.29262/ram.v63i2.149.

[Autoreactive TCD8+ lymphocytes in patients with chronic myeloid leukemia in association with HLA and adenovirus infection]

[Article in Spanish]
Sergio E Rivera  1 , Miriam Echeverría, Pedro Salcedo, Georgina Márquez, Zuhey Carrillo, Yennis Parra, Ana María Cipriani, José R Núñez, Melchor Álvarez de Mon, Atilio Farruco
Affiliations

[Autoreactive TCD8+ lymphocytes in patients with chronic myeloid leukemia in association with HLA and adenovirus infection]

[Article in Spanish]
Sergio E Rivera et al. Rev Alerg Mex. 2016 Apr-Jun.

Abstract
in English, Spanish

Background: A possible interaction between a specific HLA type and Adenovirus has been postulated as a promoter in leukemia clonal evolution. The HLA-DRB1*14, specifically DRB1*14:21, 14:22, 14:45, 14:26, 14:33, 14:51, 14:35 subtypes was the most frequent in CML Venezuelan patients.

Objectives: It is interesting to evaluate the molecular mimicry between the Adenovirus and the DRB1*14 subtypes which exhibit the same change in the amino acid position of the DR53 epitope. This mimicked segment has been identified as a LLERRRA polypeptide.

Material and method: Experimental research conducted in the IHO Venezuela, in peripheral blood samples of patients with ALL, CML and healthy controls. Mixed culture, serology, lymphocyte proliferation and cytofluorometry were performed.

Results: DRB1*14 patient's lymphocytes reacted in 48 hours mixed culture against DRB1*14 promoters lymphocytes exhibiting increased CD8+T lymphocytes. CML patients show a different serological profile against Adenovirus. Only CML patients reacted to LLERRRA peptide, increasing CD8+ T cells.

Conclusion: It is established that the relationship CML, HLADRB1* 14, autoreactive CD8+ T memory cell and CD8+T specific response from Adenovirus could be at the origin of the CML in Venezuelan patients.

Antecedentes: algunos adenovirus se han señalado como activadores clonales en leucemias. El alelo HLA-DRB1* 14 subtipos DRB1*14:21, 14:22, 14:45, 14:26, 14:33, 14:51, 14:35 se asociaron con leucemia mieloide crónica (LMC) en pacientes venezolanos. Objetivo: evaluar el mimetismo molecular entre el adenovirus y la estructura del antígeno HLA-DRB1*14 que exhiben el mismo cambio en la posición de aminoácido del epítopo DR53. Material y método: estudio experimental realizado en el IHO Banco de Sangre del Estado Zulia, Venezuela en muestras de sangre periférica de pacientes con LLA, LMC y controles sanos. Se realizaron cultivo mixto de linfocitos, serología, proliferación linfocitaria y citofluorometría. Resultados: los linfocitos DRB1*14 del paciente reaccionaron en 48 horas versus los linfocitos DRB1*14 estimuladores, que exhibieron aumento de los linfocitos T CD8+. Los pacientes con LMC tuvieron un perfil serológico diferente contra el adenovirus. Sólo pacientes con LMC reaccionaron frente al péptido secuencia LLERRRA con incremento de las células TCD8+. Conclusión: se estableció que la relación leucemia mieloide crónica, HLA-DRB1*14, células TCD8+ de memoria autorreactivas y TCD8+ en respuesta específica frente al adenovirus podría estar en el origen de la leucemia mieloide crónica de pacientes venezolanos.

Keywords: HLA association and disease; TCD4+; adenovirus; leukemias.

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