Three-Dimensional Culture Enhances the Antimicrobial Activity of Mesenchymal Stem Cells Against Shiga Toxin-Producing Escherichia coli O157:H7 In Vitro

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ID: 313369
2026
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Abstract
AIMS: This study examines the in vitro antibacterial activity of palatal adipose tissue-derived mesenchymal stem cells (PAT-MSCs) and the expression of antimicrobial peptide LL-37, with a particular focus on the effect of three-dimensional (3D) nanofibrillar cellulose-based hydrogel, against Shiga toxin producing Escherichia coli (STEC) harboring stx1 and/or stx2 genes isolated from mastitis milk in Turkey. METHODS AND RESULTS: The antibacterial activity of conventionally cultured PAT-MSCs and 3D-cultured PAT-MSCs (PAT-MSCs-3D) was evaluated against STEC isolates and Escherichia coli ATCC 35150 using quantitative colony-forming unit (CFU) assay. The expression levels of antimicrobial peptide (AMP)-encoding genes were evaluated by quantitative real-time PCR, and AMP production was further validated by immunocytochemical staining. The results indicated that PAT-MSCs-3D exhibited significantly enhanced antibacterial efficacy, resulting in marked bacterial inhibition of all tested STEC strains, with bacterial reductions reaching up to 6-7 log under specific experimental conditions. Molecular and immunocytochemical analyses demonstrated increased expression of the antimicrobial peptide LL-37 in PAT-MSCs-3D compared to 2D cultures. CONCLUSIONS: Our results show that culturing PAT-MSCs in 3D conditions leads to a significant enhancement in their antimicrobial properties, which could be linked to the upregulation of LL-37.
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Authors Mesude Biçer, Esengül Öztürk, Fatma Sener, Süheyla Türkyılmaz, Özkan Fidan
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Journal Journal of applied microbiology
Year 2026
DOI
10.1093/jambio/lxag118
URL
https://doi.org/10.1093/jambio/lxag118
Keywords Keywords not found

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