Evaluation of in vitro colonisation and immunomodulation of Lactiplantibacillus plantarumL3 microcapsules after subjected to yoghurt storage

In vitro screening of synbiotics composed of Lactobacillus and oligosaccharides and evaluating the potential anti-allergic ability

Studies have demonstrated that the supplementation of oligosaccharides and Lactobacillus has the potential to alleviate food allergies. In this study, the gastrointestinal tolerance and adhesion properties of three anti-allergic Lactobacillus strains were evaluated in vitro. Subsequently, five oligosaccharides were incubated with each selected Lactobacillus strain to determine which combination could significantly promote Lactobacillus proliferation. The ability of Lactobacillus-oligosaccharide combinations to intervene allergic responses was assessed using a bone marrow-derived dendritic cells (BMDCs) and splenocytes co-culture model. The results indicated that Lactiplantibacillus plantarum (Lp) exhibited significant resistance to acidic conditions, bile salts, pepsin and trypsin, as well as excellent hydrophobicity, auto-aggregation, antioxidant properties, and Caco-2 cells adhesion. Moreover, Lp co-cultured with fructo-oligosaccharide (FOS) produced higher levels of short-chain fatty acids. Furthermore, Lp-FOS suppressed the expression of surface markers CD40 and CD86 on BMDCs. Additionally, the DCs-splenocytes co-culture model revealed that Lp-FOS upregulated the percentage of Th1 and Tregs, downregulated the percentage of Th2 and Th17 cells, and suppressed the release of pro-inflammatory cytokines. Overall, this study highlights the potential anti-allergic functions of the synbiotic combination of Lp-FOS, which will provide theoretical basis for intervention of allergy by Lp-FOS as dietary supplement.

The Therapeutic Effects of Lactic Acid Bacteria Isolated from Spotted Hyena on Dextran Sulfate Sodium-Induced Ulcerative Colitis in Mice

BACKGROUND

Inflammatory bowel disease (IBD) is a chronic condition characterized by recurrent episodes and an unclear etiology. Given the limitations of current therapeutic options, which include suboptimal efficacy and significant side effects, there is a pressing need to explore novel treatments. Probiotics derived from diverse species have been identified as a promising approach for managing IBD, owing to their anti-inflammatory properties and their ability to regulate gut flora, among other beneficial effects.

METHODS

In this study, three strains of lactic acid bacteria (LAB) were isolated from the feces of the scavenger spotted hyena (Crocuta crocuta), a scavenging mammal. Based on their capability to survive within and adhere to the gastrointestinal tract, along with their profile of antibiotic resistance, a high-quality strain of Lactobacillus acidophilus (LA) was selected and demonstrated to be safe for mice. Subsequently, the therapeutic efficacy of LA was evaluated using a dextran sulfate sodium (DSS)-induced model of ulcerative colitis in mice.

RESULTS

The results indicated that LA restored the disease activity index and improved histopathological lesions in the model group. It also reduced inflammation and oxidative stress and significantly restored the expression of mucins and intestinal tight junction (TJ) proteins (ZO-1, Occludin). Furthermore, LA corrected the DSS-induced disruption of the intestinal flora, leading to a significant decrease in the prevalence of potentially harmful bacterial genera, such as Bacteroides, and an increase in beneficial bacterial genera, including Lactobacillus. In conclusion, Lactobacillus acidophilus LA1, isolated from spotted hyena feces, has potential as a functional supplement for alleviating symptoms of IBD and regulating intestinal flora.