AMB Express (Nov 2021)

Immunoassay standardization for the detection of immunoglobulin A (IgA) against Porphyromonas gingivalis antigens in saliva of individuals with and without leprosy

  • Mariana Costa Calheira,
  • Soraya Castro Trindade,
  • Michelle Miranda Lopes Falcão,
  • Luciana Sales Conceição Barbosa,
  • Gislene Regina Batista Carvalho,
  • Paulo Roberto Lima Machado,
  • Isaac Suzart Gomes-Filho,
  • Elisangela de Jesus Campos,
  • Paulo Cirino de Carvalho-Filho,
  • Márcia Tosta Xavier,
  • Antonio Pedro Fróes de Farias,
  • José Tadeu Raynal Rocha Filho,
  • Johelle de Santana Passos-Soares

DOI
https://doi.org/10.1186/s13568-021-01312-7
Journal volume & issue
Vol. 11, no. 1
pp. 1 – 7

Abstract

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Abstract Leprosy reactions are immune processes that cause neural damage in individuals with leprosy. As periodontitis is an infectious disease related to its development, specific antibodies to periodontal pathogens must be evaluated to better understand the humoral mechanisms underlying this relationship. Therefore, the objective of this study was to standardize an immunoassay to measure IgA specific to P. gingivalis antigens in the saliva of individuals with leprosy. An ELISA checkerboard titration was performed. A validation test involving 53 individuals with leprosy, 24 with and 19 without periodontitis, was conducted and a ROC curve constructed to calculate sensitivity and specificity. The coefficient of the optical densities was 2.21 and 2.66 for P. gingivalis crude extract and the recombinant protein HmuY, respectively. Sensitivity and specificity for the P. gingivalis crude extract were 66.7% and 73.7%, respectively, and for HmuY, were 62.5% and 52.6%, respectively. Specific recognition of P. gingivalis occurred predominantly in individuals with periodontitis, which validates the use of this test for studying periodontitis in individuals with leprosy. Trial registration CAEE 64476117.3.0000.0049, 21/07/2017, retrospectively registered

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