Purification of IgG against ribonucleoprotein by a homemade immunoaffinity chromatography column for rabies diagnosis

Polyclonal or monoclonal antibodies against rabies virus ribonucleoprotein (RNP) conjugated to fluorescein isothiocyanate (FITC) have been employed for Rabies virus (RABV) antigen detection by the direct fluorescent antibody test (DFA). To date, these biomolecules have been purified by traditional m...

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Bibliographic Details
Published in:Journal of immunological methods 2019-08, Vol.471, p.1-10
Main Authors: da Silva Santos, Jaqueline Helena, da Silva, Gabriela Hidaka, Iamamoto, Keila, Katz, Iana Suly Santos, Guedes, Fernanda, Fernandes, Elaine Raniero, de Cassia Rodrigues da Silva, Andrea, dos Ramos Silva, Sandriana
Format: Article
Language:English
Subjects:
Animals
Antibodies, Antinuclear - immunology
Antibodies, Monoclonal - immunology
Antibodies, Viral - immunology
Antigens, Viral - immunology
Cats
Cattle
Cell Line
Chiroptera
Chromatography, Affinity - methods
Direct fluorescent antibody test
Dogs
Haplorhini
Horses
IgG antibody
Immunoaffinity chromatography
Immunoglobulin G - immunology
Rabies
Rabies - diagnosis
Rabies - immunology
Rabies - virology
Rabies virus - immunology
Rabies virus - physiology
Ribonucleoproteins - immunology
Sensitivity and Specificity
Species Specificity
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Summary:Polyclonal or monoclonal antibodies against rabies virus ribonucleoprotein (RNP) conjugated to fluorescein isothiocyanate (FITC) have been employed for Rabies virus (RABV) antigen detection by the direct fluorescent antibody test (DFA). To date, these biomolecules have been purified by traditional methods such as precipitation by ammonium sulfate or ion exchange chromatography followed by ammonium sulfate precipitation, which allows only for partial detection of the protein of interest. In this study, we aimed to purify anti-RNP polyclonal horse IgG antibodies by cation-exchange chromatography in combination with a homemade immunoaffinity chromatography on RNP immobilized (RNP-IAC). Furthermore, to evaluate the accuracy of the prepared anti-RNP IgG fluorescent antibody in diagnostic purposes, DFA was applied for RABV antigen detection in suspected brain samples of different animal species. The combination of these two techniques made it possible to obtain antibodies with high selectivity and purity. Compared with the performance of the traditional method, anti-RNP IgG antibodies purified by RNP-IAC can be obtained from a smaller volume of hyperimmune serum and with greater avidity. Furthermore, the results obtained by DFA analyses revealed that the prepared anti-RNP IgG fluorescent antibody achieved 100% diagnostic specificity and sensitivity for RABV antigen detection. Thus, two-technique chromatographic, including RNP-IAC technology could be appropriate methods for the purification of polyclonal anti-RNP IgG for the use as a diagnostic reagent for rabies.
ISSN:0022-1759
1872-7905
DOI:10.1016/j.jim.2019.03.007