Avaliação comparativa das proteinas de fusão cmx e ecmx no teste de mantoux para o diagnóstico de tuberculose

• Autor(a) principal: Sánchez, Tatiana Marlene Galvez
• Data de Publicação: 2017
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tede/7004
• topic: Tuberculose (TB); Prova tuberculínica (PT); Hipersensibilidade do tipo tardia (DTH); Tuberculosis (TB); Tuberculin skin test (TST); Delayed hypersensitivity reaction (DTH); CIENCIAS BIOLOGICAS::IMUNOLOGIA

Tuberculin skin test (TST) identifies a previous exposed to M. tuberculosis (Mtb) using an intradermal inoculation of purified protein derivates (PPD) that result in a delayed hypersensitivity reaction (DTH). Interferon-gamma release assay (IGRA) was suggested to replace TST. The IGRA uses antigens, ESAT-6 and CFP-10, absent in all BCG strains and some non tuberculous mycobacteria (NTM). However, reproducibility and high cost were limitations for endemic countries. For this reason, the development of new diagnose test for latent TB is necessary. Fusion proteins developed by our group has been recognized by the immune response generated by the infection with Mycobacterium tuberculosis. Thus the aim of this work was to evaluate the capacity of CMX or ECMX to be used in a Skin test for tuberculosis. BALB/c mice infected with Mtb were euthanized forty-five days after infection. Spleens, lungs and draining lymph nodes of infected mice were processed and evaluated by flow cytometry Both CD4 and CD8 IFN+ cells were able to recognize rCMX and rECMX. The skin test followed an evaluation of thickness/swelling ≥ PPD 2UT (positive control) to consider positive DTH. Based on thickness, at 24 h, rCMX 25μg (0.37±0.02) and rECMX 15-25μg (0.38±0.03/0,62±0,12) induced a positive DTH response. At 48h, rCMX 25μg (0.28±0.03) and rECMX 25μg (0.5±0.04) induced also a positive DTH reaction. In conclusion, fusion proteins rCMX and rECMX are recognized by infected mice with Mtb and skin test using rECMX 25μg induced better DTH response that of conventional PPD.