Generation and selection of antibodies for a novel immunochromatographic lateral flow test to rapidly identify OXA-23-like-mediated carbapenem resi…

A new interesting article has been published in J Med Microbiol. 2019 Jul;68(7):1021-1032. doi: 10.1099/jmm.0.001015. Epub 2019 Jun 12. and titled:

Generation and selection of antibodies for a novel immunochromatographic lateral flow test to rapidly identify OXA-23-like-mediated carbapenem resi…

Authors of this article are:

Mertins S, Higgins PG, Rodríguez MG, Borlon C, Gilleman Q, Mertens P, Seifert H, Krönke M, Klimka A.

A summary of the article is shown below:

INTRODUCTION: The spread of carbapenem-resistant Acinetobacter baumannii has led to a worldwide healthcare problem. Carbapenem resistance in A. baumannii is mainly mediated by the acquisition of the carbapenem-hydrolyzing oxacillinase OXA-23. The phenotypic detection of carbapenem-producing A. baumannii is challenging and time-consuming. Hence, there is an unmet medical need for reliable and rapid diagnostic tools to detect OXA-23-producing Acinetobacter isolates to enable successful patient management.AIM: Development of an immunochromatographic lateral flow test (ICT) for the rapid and reliable detection of OXA-23-producing carbapenem-resistant Acinetobacter isolates.METHODOLOGY: For the development of an antibody-based ICT, we generated anti-OXA-23 monoclonal antibodies (MoAbs) and screened them sequentially for their ability to bind native OXA-23. Selected OXA-23-specific MoAbs were tested in different combinations for their capacity to capture and detect OXA-23His6 by sandwich enzyme-linked immunosorbent assay (ELISA) and ICT. A well-characterized collection of carbapenem-resistant Acinetobacter isolates with defined carbapenem resistance mechanisms were used to evaluate the specificity of the final OXA-23 ICT prototype.RESULTS: The antibody pairs best suited for the sandwich ELISA format did not match the best pairs in the ICT format selected during the development process of the final prototype OXA-23 ICT. This prototype was able to differentiate between OXA-23 subfamily-mediated carbapenem resistance and carbapenem-resistant Acinetobacter isolates overexpressing other OXAs with 100  % specificity and a turnaround time of 20 min from culture plate to result.CONCLUSION: With this rapid detection assay one can save 12-48 h of diagnostic time, which could help avoid inappropriate use of carbapenems and enable earlier intervention to control the transmission of OXA-23-producing carbapenem-resistant Acinetobacter isolates to other patients and healthcare workers.

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This article is a good source of information and a good way to become familiar with topics such as: Acinetobacter baumannii;Animals;Anti-Bacterial Agents;Antibodies, Monoclonal;Bacterial Proteins;Carbapenems;Cloning, Molecular;Female;Gene Expression Regulation, Bacterial;Immunoassay;Mice;Microbial Sensitivity Tests;beta-Lactamases.

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