Formulation and Validation of Recombinant Antigens CFP10 and ESAT6 for Tuberculosis Diagnosis
Braz. arch. biol. technol
;
64(spe): e21210127, 2021. tab, graf
Article
in English
| LILACS
| ID: biblio-1285571
ABSTRACT
Abstract The rapid and accurate diagnosis of tuberculosis (TB), especially considering limited resources, is still a challenge. Development of new methodologies and tests are needed to overcome several disadvantages of the available standard tests. We evaluated the diagnostic potential of two antigens specific for Mycobacterium tuberculosis, the CFP10 and ESAT6 recombinant proteins, and developed stable formulations thereof. Sensitivity and specificity of the delayed-type hypersensitivity (DTH) skin testing and the induction of gamma interferon production (IFN-γ) by lymphocytes, as a non-invasive test, were evaluated using the CFP10 and ESAT6 protein formulations. The recombinant proteins produced by our group presented a high DTH response and the ability to differentiate between tuberculosis infection, BCG vaccination, and the contact with non-tuberculous mycobacteria (NTM). The production of IFN-γ by stimulation with individual and combined proteins was detected in a panel of 40 individuals and showed a specificity of 100% and a sensitivity of 90% when the two proteins were used together. Lyophilized formulations were stable under all conditions, while soluble formulations were stable under freezing at -20 ºC and -80 ºC. The proposed formulations containing the ESAT6 and CFP10 recombinant antigens constitute satisfactory tools for TB testing, suitable to be developed and implemented in a large-scale trial.
Full text:
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Index:
LILACS (Americas)
Main subject:
Tuberculosis
/
Interferon-gamma
/
Mycobacterium tuberculosis
/
Antigens
Type of study:
Diagnostic study
Language:
English
Journal:
Braz. arch. biol. technol
Journal subject:
Biology
Year:
2021
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Federal University of Paraná/BR
/
Federal University of Rio de Janeiro/BR
/
Paraná Institute of Technology/BR
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