Bacterial extracellular vesicles (EVs) mediate communication between the gut microbiota and the host by transporting active biomolecules away from their release site. During the neonatal period, initial microbial colonizers — including bifidobacteria and lactobacilli — contribute to the maturation of digestive, immune and neural systems. Because exposures in early life can shape long-term health, perturbations of early microbial interactions are of clinical interest. Antibiotic therapies are common in the postnatal period and are associated with alterations of the microbiota. Understanding how antibiotics affect microbial products such as EVs may help clarify pathways by which neonatal exposures influence later outcomes.
The investigators implemented a robust, reproducible in-house workflow for extraction and purification of bacterial EVs (bEVs) from two Gram-positive gut primo-colonizers: Bifidobacterium longum and Lactiplantibacillus plantarum. Using that workflow, they compared EV production and the vesicular proteome (proteovesiculome) between untreated cultures and cultures treated with amoxicillin. The source text reports the existence of this workflow and that EV yield and protein content were analyzed; the abstract does not enumerate procedural parameters, quantitative metrics, or statistical details, which are not reported in the provided source excerpt.
Results reported in the abstract indicate a dissociated response in EV release between the two species when exposed to amoxicillin. Specifically, B. longum exhibited an enhanced production of EVs under amoxicillin treatment compared with non-treated controls. In contrast, L. plantarum did not show an analogous increase; rather, the impact of amoxicillin on EV release and regulation differed by strain. The abstract frames this as a species-specific regulation of vesiculogenesis in response to antibiotic exposure.
Proteomic profiling of the EV cargo (proteovesiculome) revealed divergent effects for the two species. EVs derived from amoxicillin-treated B. longum cells were reported to be enriched in proteins and to display greater protein diversity relative to EVs from untreated B. longum. Conversely, EVs from amoxicillin-treated L. plantarum displayed a shift consistent with a reduction of protein richness compared with non-treated counterparts. These contrasting directions — increased protein content and diversity in B. longum EVs versus loss of protein richness in L. plantarum EVs — underscore that antibiotic exposure can alter not only the quantity of vesicles but also their molecular cargo in a species-dependent manner.
Given the role of bacterial EVs in transporting bioactive molecules, species-specific changes in EV production and cargo after antibiotic exposure could modulate microbiota–host signaling during a critical developmental window. The observed enhancement of EV release and proteomic enrichment in B. longum under amoxicillin suggests that antibiotic exposure might alter the profile of microbial signals delivered to host tissues. By contrast, the apparent loss of protein richness in L. plantarum EVs suggests reduced or qualitatively altered signaling from that species. Together, these findings open avenues for investigating how common neonatal antibiotic therapies may impact the functional output of beneficial Gram-positive gut bacteria and thereby influence maturation of digestive, immune, or neural systems.
This article is a preprint and has not been peer reviewed; the abstract summarizes key findings but does not provide full experimental detail, quantitative results, or statistical analyses in the provided excerpt. The source indicates the authors used a reproducible extraction workflow and carried out proteovesicular analyses, but specific methodological parameters, sample sizes, and effect sizes are not reported in the abstract. Future peer-reviewed publication and access to the full dataset and methods (some data/code links are indicated in the source) will be necessary to evaluate reproducibility and to interpret clinical relevance. Additional studies in biological models will be required to determine whether the reported alterations in EV production and cargo translate into measurable effects on host development or health outcomes following neonatal antibiotic exposure.
Note: the findings reported here are drawn from the preprint abstract and the authors' summary. The authors declared no competing interests in the source document.