Interactions between Mycoplasma mycoides and bovine macrophages under physiological conditions

Totté Philippe, Bonnefois Tiffany, Manso-Silvan Lucia. 2024. Interactions between Mycoplasma mycoides and bovine macrophages under physiological conditions. PloS One, 19 (6):e0305851, 12 p.

https://doi.org/10.1371/journal.pone.0305851

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Url - jeu de données - Entrepôt autre : https://zenodo.org/record/7442582#.ZAiYrHbMJOC / Url - jeu de données - Entrepôt autre : https://figshare.com/articles/figure/Stability_of_the_bactericidal_effect_of_bovine_complement_/26120061

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie; Staps

Résumé : We investigated the interactions of unopsonized and opsonized Mycoplasma mycoides subsp. mycoides (Mmm) with bovine macrophages in vitro. Mmm survived and proliferated extracellularly on bovine macrophage cell layers in the absence of Mmm-specific antisera. Bovine complement used at non-bactericidal concentrations did neither have opsonizing effect nor promoted intracellular survival, whereas Mmm-specific antisera substantially increased phagocytosis and Mmm killing. A phagocytosis-independent uptake of Mmm by macrophages occurred at a high multiplicity of infection, also found to induce the production of TNF, and both responses were unaffected by non-bactericidal doses of bovine complement. Bovine complement used at higher doses killed Mmm in cell-free cultures and completely abrogated TNF responses by macrophages. These results provide a framework to identify Mmm antigens involved in interactions with macrophages and targeted by potentially protective antibodies and point towards a pivotal role of complement in the control of inflammatory responses in contagious bovine pleuropneumonia.

Mots-clés Agrovoc : péripneumonie contagieuse bovine, Mycoplasma mycoides, macrophage, bactéricide, phagocytose, bovin, membrane cellulaire, maladie bactérienne, maladie des animaux, maladie respiratoire

Mots-clés géographiques Agrovoc : France

Mots-clés libres : Macrophages, Complement system, Immune serum, Mycoplasma, Intracellular pathogens, Flow cytometry, Intracellular membranes

Classification Agris : L73 - Maladies des animaux

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

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