Introduction

Ligilactobacillus murinus is a specialized member of the gut ecosystem known for its role in maintaining the delicate balance between the host's immune system and the intestinal environment. As part of the broader Lactobacillus group, this microbe is instrumental in supporting the gut-liver axis and modulating systemic inflammatory responses. Through the production of key metabolites and the regulation of immune cells, L. murinus helps protect the host from metabolic stress and maintains the integrity of the intestinal barrier.

Location of Microbe

Gut Ecosystem

Ligilactobacillus murinus primarily colonizes the intestinal tract, where it resides as a commensal organism, contributing to the overall microbial diversity of the gut ecosystem.

Behavior During Dysbiosis

Response to Dietary Stress

In states of dysbiosis triggered by a high-salt diet, the abundance of L. murinus is significantly depleted, which is associated with an increase in pro-inflammatory TH17 cells.

Metabolic Decline

During the progression of nonalcoholic fatty liver disease (NAFLD), there is a observed reduction in the composition of L. murinus within the gut microbiome.

Disease Associations

Gut Ecosystem

Ligilactobacillus murinus is associated with several systemic and localized health conditions through the gut-immune axis. In the context of nonalcoholic fatty liver disease (NAFLD), a reduced abundance of L. murinus is observed in patients, suggesting that its presence is linked to better liver health. Furthermore, it plays a protective role against atherosclerosis; its expansion in the gut provides lactate as a substrate for butyrate production, which inhibits macrophage pyroptosis and reduces plaque inflammation via the GSDMD/NLRP3/IL-1β signaling pathway.

The microbe is also associated with the management of intestinal ischemia/reperfusion (I/R) injury. Higher relative abundance of L. murinus in the preoperative feces of patients is associated with a lower degree of post-surgical intestinal injury, likely due to its ability to promote the release of anti-inflammatory interleukin-10 (IL-10) from M2 macrophages through TLR2 signaling. Additionally, its depletion is associated with salt-sensitive hypertension and the aggravation of autoimmune conditions, as the loss of this microbe modulates the TH17 axis toward a pro-inflammatory state.

Foods Supporting Healthy Balance

Maintaining a healthy abundance of Ligilactobacillus murinus involves dietary patterns that avoid extreme stressors and support the overall gut ecosystem. Since high salt intake is directly associated with the depletion of L. murinus, adopting a low-sodium diet is critical for preserving this microbe's population. Reducing processed foods and excess table salt helps prevent the salt-induced dysbiosis that triggers inflammatory TH17 responses.

Furthermore, providing the necessary substrates for the functional potential of the microbiome is key. Diets rich in prebiotic fibers support the production of short-chain fatty acids (SCFAs). Because L. murinus supports the growth of butyrate-producing bacteria by providing lactate, a diet that encourages a diverse fermented environment—such as one containing varied vegetables, legumes, and whole grains—can enhance the synergistic relationship between L. murinus and other beneficial butyrate-producers, ultimately strengthening the gut barrier integrity.

Actionable Insights

Management Strategies

• Reduce Sodium Intake: Limit high-salt foods to prevent the depletion of L. murinus and maintain a balanced TH17 immune response.
• Support the Gut-Liver Axis: Focus on a diet that prevents steatosis, as the presence of L. murinus is associated with reduced liver fat accumulation.
• Enhance Barrier Integrity: Consume fiber-rich foods to support the lactate-to-butyrate metabolic pathway, which helps prevent the translocation of lipopolysaccharides (LPS) into the bloodstream.
• Monitor Post-Surgical Recovery: Be aware that gut microbial diversity, including the presence of L. murinus, is associated with better outcomes following intestinal ischemia events.

Conclusion

Ligilactobacillus murinus serves as a vital modulator of the gut ecosystem, acting as a bridge between intestinal health and systemic immunity. Its role extends from the prevention of liver steatosis to the attenuation of atherosclerosis and the protection against intestinal ischemia/reperfusion injury. By influencing the production of butyrate and the regulation of macrophage activity, L. murinus helps maintain gut barrier integrity and suppresses chronic inflammatory signaling. Ensuring a diet low in salt and rich in prebiotic support is essential to maintain the microbial abundance of this beneficial organism, thereby promoting long-term preventive health.