Resumo

FARACE, Pablo et al. Campylobacter fetus releases S-layered and immunoreactive outer membrane vesicles. Rev. argent. microbiol. [online]. 2022, vol.54, n.2, pp.71-80. ISSN 0325-7541.

The study of outer membrane vesicles (OMVs) became relevant because of theirprobable important role in the transfer of virulence factors to host cells. Campylobacter fetusis mainly a mammal pathogen whose virulence characterization is still limited. The aim of thisstudy was to evaluate and to characterize the secretion of OMVs in this bacterium. By trans-mission electron microscopy, we confirmed the production of OMVs in all the strains assayed.Purified OMVs showed a spherical shape and variable size, although comparable to those ofother gram-negative bacteria. We also confirmed the presence of the S-layer on the surface ofthe OMVs of all the strains assayed with the exception of those derived from the NTCC referencestrain. In addition, we demonstrated their immunoreactivity by the dot-blot assay. Hence, C.fetus OMVs could contribute to the modulation of the host response and constitute a candidateto be evaluated as an adjuvant of current vaccines used in the veterinary field. This work rep-resents a platform to drive future studies towards the role of these subcellular structures in C.fetus-host interaction.

Palavras-chave : Outer membranevesicles; Campylobacter; Bacterial pathogen;Virulence.

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