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Lactobacillus johnsonii is a Gram-positive, non-spore-forming bacterium belonging to the Lactobacillaceae family. As a member of the gut microbiota in humans and various animals, it plays a crucial role in maintaining intestinal health and supporting the immune system. Unlike chemical compounds, this organism does not possess a single molecular formula or a traditional CAS number, as these identifiers apply to specific chemical substances rather than living microbial strains. Instead, specific strains are identified by unique accession numbers in culture collections, such as ATCC 25706 for the type strain.
This probiotic species is widely recognized for its ability to survive passage through the gastrointestinal tract, allowing it to colonize temporarily and exert beneficial effects. Its primary applications lie in human nutrition, animal feed supplementation, and pharmaceutical development. In the food industry, L. johnsonii is utilized as a starter culture or adjunct culture in fermented dairy products like yogurt and cheese, contributing to flavor development and extending shelf life through the production of lactic acid and bacteriocins that inhibit pathogenic bacteria.
Scientific research highlights its potential therapeutic benefits, including modulation of the host immune response, reduction of inflammation, and prevention of infections caused by pathogens such as Salmonella and Clostridium difficile. Furthermore, studies suggest that certain strains may help manage metabolic disorders, including obesity and diabetes, by influencing lipid metabolism and insulin sensitivity. The bacterium also produces bioactive metabolites like short-chain fatty acids and exopolysaccharides, which support gut barrier integrity. Due to its safety profile and efficacy, it is increasingly incorporated into dietary supplements designed to restore microbial balance after antibiotic treatment. While regulatory approval varies by region, L. johnsonii remains a promising candidate for next-generation probiotics aimed at promoting overall wellness and preventing chronic diseases through microbiome optimization.