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• W4377047295 endingPage "6730" @default.
• W4377047295 startingPage "6723" @default.
• W4377047295 abstract "Streptococcus pyogenes is an important human pathogen, commonly spread by airborne droplets but also by ingestion of contaminated food. Apart from causing infection, this pathogen produces 13 distinct types of streptococcal pyrogenic exotoxins (SPE). The current method for detection cannot distinguish between the biologically active form of SPE that has been reported to cause foodborne outbreaks and the inactivated toxin that poses no health risk. To measure the biological activity of SPE type C (SPE-C), one such toxin that was linked to foodborne outbreaks associated with milk and milk products, we developed a cell-based assay that can discern between biologically active and inactive SPE-C. To the best of our knowledge, this is the first showing that SPE-C activates T-cells expressing Vβ8. With this finding, we used a T-cell line natively expressing Vβ8 that was genetically engineered to also express the luciferase reporter gene under the regulation of nuclear factor of activated T-cells response element in combination with a B-cell line to present the recombinant SPE-C (rSPE-C) toxin via major histocompatibility complex (MHC) class II to the Vβ8 T-cell receptor (TCR) in an assay to detect and to discern between biologically active and inactive rSPE-C. By using this system, we demonstrated that SPE-C induced significant IL-2 secretion after 72 h and visible light emission after only 5 h, doubling by 24 h. We utilize this finding to assess the specificity of the assay and the effect of pasteurization on SPE-C activity. We observed no cross-reactivity with SPE-B and significant loss of SPE-C biological activity in spiked phosphate-buffered saline while SPE-C spiked into milk is heat stable. Once SPE-C has formed, it is infeasible to eliminate it from milk by thermal treatment." @default.
• W4377047295 created "2023-05-19" @default.
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• W4377047295 date "2023-10-01" @default.
• W4377047295 modified "2023-10-17" @default.
• W4377047295 title "T-cell receptor Vβ8 for detection of biologically active streptococcal pyrogenic exotoxin type C" @default.
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• W4377047295 doi "https://doi.org/10.3168/jds.2023-23286" @default.
• W4377047295 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37210361" @default.
• W4377047295 hasPublicationYear "2023" @default.
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