An Antigen Capture Assay for the Detection of Mycolactone, the Polyketide Toxin of Mycobacterium ulcerans
| Autor: | Louisa Warryn, Karl-Heinz Altmann, Philipp Gersbach, Gerd Pluschke, Matthias Gehringer, Jean-Pierre Dangy |
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| Rok vydání: | 2021 |
| Předmět: |
Buruli ulcer
medicine.drug_class Immunology medicine.disease_cause Monoclonal antibody Epitope Microbiology Mice 03 medical and health sciences chemistry.chemical_compound Polyketide 0302 clinical medicine Novel Immunological Methods medicine Animals Immunology and Allergy Mycolactone Antigens Bacterial Molecular Structure Mycobacterium ulcerans biology Toxin Antibodies Monoclonal Antigen capture assay medicine.disease biology.organism_classification chemistry Macrolides 030215 immunology |
| Zdroj: | J Immunol |
| ISSN: | 1550-6606 0022-1767 |
| Popis: | Mycolactone is a cytotoxin responsible for most of the chronic necrotizing pathology of Mycobacterium ulcerans disease (Buruli ulcer). The polyketide toxin consists of a 12-membered lactone ring with a lower O-linked polyunsaturated acyl side chain and an upper C-linked side chain. Mycolactone is unique to M. ulcerans and an immunological Ag capture assay would represent an important tool for the study of Buruli ulcer pathogenesis and for laboratory diagnosis. When testing sets of mycolactone-specific mouse mAbs, we found that Abs against the hydrophobic lower side chain only bind mycolactone immobilized on a solid support but not when present in solution. This observation supports previous findings that mycolactone forms micellar structures in aqueous solution with the hydrophobic region sequestered into the inner core of the aggregates. Although an Ag capture assay typically requires two Abs that recognize nonoverlapping epitopes, our search for matching pairs of mAbs showed that the same mAb could be used both as capture and as detecting reagent for the detection of the mycolactone aggregates. However, the combination of a core-specific and a core/upper side chain–specific mAb constituted the most sensitive ELISA with a sensitivity in the low nanogram range. The results of a pilot experiment showed that the sensitivity of the assay is sufficient to detect mycolactone in swab samples from Buruli ulcer lesions. Although the described capture ELISA can serve as a tool for research on the biology of mycolactone, the assay system will have to be adapted for use as a diagnostic tool. |
| Databáze: | OpenAIRE |
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