Research shows strain CBA3656 enhances nanoplastic adsorption in germ-free mouse model — Evidence Review

A new study from the World Institute of Kimchi demonstrates that a lactic acid bacterium isolated from kimchi, Leuconostoc mesenteroides CBA3656, can bind to nanoplastics in the intestine and promote their excretion in a mouse model. Related studies broadly support the potential of probiotic and food-derived bacteria to adsorb or reduce the uptake of nanoplastics in the gastrointestinal tract.

• Multiple studies corroborate that certain probiotic strains from fermented foods, including lactic acid bacteria and Bacillus species, are capable of adsorbing micro- and nanoplastics or suppressing their cellular internalization, supporting the new findings 1 2 3.
• The observed effectiveness of L. mesenteroides CBA3656 in simulated intestinal conditions and in vivo models aligns with earlier evidence that bacterial biosorption or interaction with nanoplastics can persist under physiologically relevant environments 3.
• Systematic reviews and experimental studies highlight the adverse health effects of nanoplastic exposure, underscoring the significance of biological approaches—such as probiotic interventions—for mitigating nanoplastic accumulation and potential toxicity 5 6 7 8.

Study Overview and Key Findings

Growing concerns over nanoplastics—tiny plastic particles less than 1 µm in size—stem from their persistence in the environment and ability to enter the human body through food and water. Their small size enables them to cross biological barriers, accumulate in tissues, and potentially contribute to health risks, yet effective strategies to limit gastrointestinal absorption and promote excretion have been lacking. The study from the World Institute of Kimchi addresses this gap by investigating whether probiotics derived from fermented foods, specifically kimchi, may offer a biological means to reduce nanoplastic accumulation in the gut.

Property	Value
Organization	World Institute of Kimchi
Authors	Se Hee Lee, Tae Woong Whon
Population	Germ-free mouse model
Methods	Animal Study
Outcome	Nanoplastic excretion, adsorption efficiency
Results	Strain CBA3656 showed 57% adsorption under simulated intestinal conditions.

The study specifically examined the adsorption capacity of L. mesenteroides CBA3656, a strain isolated from kimchi, against polystyrene nanoplastics (PS-NPs). Under simulated intestinal conditions, CBA3656 maintained a 57% adsorption rate, significantly higher than a reference probiotic strain. In germ-free mice, administration of the kimchi-derived strain more than doubled the fecal excretion of nanoplastics compared to controls, suggesting that such bacteria may facilitate the removal of nanoplastics from the body by binding them in the gut.

Literature Review: Related Studies

To better contextualize these findings, we searched the Consensus database (with over 200 million research papers) using targeted queries to identify relevant literature on nanoplastics, probiotics, and gastrointestinal removal strategies. The following search queries were used:

1. fermented foods nanoplastics removal
2. CBA3656 intestinal adsorption mechanisms
3. health effects of nanoplastic exposure

Summary Table of Key Topics and Findings

Topic	Key Findings
How do probiotics and food-derived bacteria interact with nanoplastics in the gut?	- Certain probiotic strains from fermented foods, such as L. mesenteroides CBA3656 and Bacillus subtilis DCP04, can adsorb or degrade micro- and nanoplastics, potentially facilitating their removal from the gastrointestinal tract 1 3. - Some lactic acid bacteria suppress nanoplastic internalization and permeability in intestinal epithelial cells 2.
What are the health risks associated with nanoplastic exposure and accumulation?	- Nanoplastics can cross intestinal barriers, accumulate in organs, and may induce cytotoxicity, oxidative stress, inflammation, and tissue damage in mammalian models 4 5 6 8. - Epidemiological and experimental evidence points to possible associations between nanoplastic exposure and adverse health outcomes, but direct human data are limited and inconsistent 5 6 7 8.
Are there effective biological or probiotic-based mitigation strategies?	- Bacteria from fermented foods show potential as biosorbents, maintaining high nanoplastic binding efficiency under various conditions, including those similar to the human intestine 1 2 3. - Animal and in vitro studies indicate that probiotic administration can increase nanoplastic excretion and reduce their translocation across biological barriers 2 3.

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How do probiotics and food-derived bacteria interact with nanoplastics in the gut?

Multiple studies demonstrate that specific probiotic and food-derived bacterial strains can adsorb, bind, or even degrade nanoplastics, offering a potential strategy for reducing nanoplastic accumulation in the gastrointestinal tract. The new study's findings, showing efficient nanoplastic adsorption and increased fecal excretion following probiotic administration, are consistent with these earlier results and provide further support for the use of microbial interventions.

• L. mesenteroides CBA3656 and Bacillus subtilis DCP04, both derived from traditional fermented foods, have shown high adsorption and degradation capacities for nanoplastics or microplastics under physiologically relevant conditions 1 3.
• Probiotic strains such as Lactobacillus delbrueckii subsp. bulgaricus 2038 and Streptococcus thermophilus 1131 can suppress the internalization and transcellular permeability of polystyrene nanoplastics in intestinal epithelial cells, reducing their potential for systemic accumulation 2.
• The adsorption behavior of L. mesenteroides CBA3656 is stable across a range of intestinal conditions, mirroring the results of the new animal study 3.
• These findings suggest that targeted probiotic interventions could serve as a biological tool to decrease nanoplastic uptake in the gastrointestinal tract 1 2 3.

What are the health risks associated with nanoplastic exposure and accumulation?

Systematic reviews and experimental studies indicate that nanoplastics can enter the human body through ingestion, inhalation, or dermal contact and have the potential to cross biological barriers, accumulate in tissues, and disrupt cellular or organ system homeostasis. The risks highlighted in these studies provide the rationale for seeking strategies, such as those explored in the new study, to minimize nanoplastic burden.

• Nanoplastics have been found in various human tissues and may induce cytotoxicity, oxidative stress, inflammatory responses, and even genotoxic and neurotoxic effects in animal and cell models 4 5 6 8.
• In rodent models, nanoplastics have been shown to bioaccumulate in the liver, spleen, kidney, brain, lung, and gut, leading to various adverse outcomes 5 6.
• Epidemiological studies are still scarce and inconclusive, but there are suggestions that nanoplastic exposure could contribute to disorders such as asthma, lung nodules, and thrombosis 6 8.
• The new study's focus on enhancing nanoplastic excretion may help address these potential risks by reducing exposure and accumulation 5 6 7 8.

Are there effective biological or probiotic-based mitigation strategies?

The literature supports the concept that certain food-derived bacteria and probiotics can serve as biosorbents or barriers to nanoplastic uptake. The new study builds on this foundation by demonstrating in vivo efficacy in a mouse model, suggesting translational potential for human health applications.

• In vitro and animal studies have shown that bacterial strains from fermented foods can maintain nanoplastic adsorption efficiency even under gastrointestinal-like conditions 1 3.
• Probiotic administration has resulted in increased fecal excretion of nanoplastics in animal models, similar to results reported in the new study 3.
• Some strains can suppress the passage of nanoplastics across intestinal barriers, potentially minimizing systemic exposure 2.
• The identification and characterization of robust biosorbent strains such as L. mesenteroides CBA3656 could pave the way for innovative probiotic interventions to limit nanoplastic accumulation in humans 1 2 3.

Future Research Questions

While the new study and related work provide promising evidence for the probiotic-based removal of nanoplastics from the gastrointestinal tract, several important questions remain. Further research is needed to clarify the mechanisms, long-term efficacy, and human applicability of these interventions, as well as to better understand the full health implications of nanoplastic exposure.

Research Question	Relevance
What are the long-term effects of probiotic administration on nanoplastic excretion and body burden?	Long-term studies are needed to determine whether probiotic interventions can sustainably reduce nanoplastic accumulation in the body and mitigate associated health risks over time 3 5.
Do kimchi-derived probiotics reduce nanoplastic burden in humans?	Translation of animal findings to human populations is critical to assess real-world efficacy and safety of such interventions, especially given the variability of human diets and microbiota 5 6.
What are the molecular mechanisms by which probiotics adsorb or block nanoplastics in the gut?	Understanding the precise molecular interactions and pathways involved could lead to more targeted and effective probiotic or microbial biosorbent therapies 1 3.
Can probiotic-based approaches prevent nanoplastic-induced toxicity in vulnerable organ systems?	Since nanoplastics can accumulate in organs such as the brain, liver, and kidneys, it is important to determine whether increased excretion via probiotics translates into reduced tissue toxicity and improved health outcomes 5 6 8.
How do different types of nanoplastics respond to adsorption by various probiotic strains?	Exploring whether probiotic efficacy is universal across plastic types, shapes, and surface chemistries will inform the design of broad-spectrum interventions and may reveal strain- and plastic-specific interactions 1 2 3.