Lactobacillus paracasei treatment modulates mRNA expression in macrophages

Area of Science:

• Immunology
• Microbiology
• Cell Biology

Background:

• Macrophage metabolic pathways are altered by external stimuli like lipopolysaccharide.
• Lipopolysaccharide activates Toll-like receptor 4, inducing M1 macrophage polarization and immune responses.
• Macrophage metabolism is crucial for regulating immune cell function and inflammatory responses.

Purpose of the Study:

• To investigate the immunomodulatory effects of specific Lactobacillus paracasei strains.
• To determine if L. paracasei can modulate macrophage metabolic pathways and polarization markers.
• To assess the impact of L. paracasei on glycolysis and M1 macrophage markers in vitro.

Main Methods:

• Utilized an in vitro rodent bone-marrow-derived macrophage (BMDM) model.
• Stimulated macrophages with lipopolysaccharide to induce M1 polarization.
• Analyzed mRNA levels of glycolysis-related enzymes, HIF1A, iNOS, and arginase following L. paracasei treatment.

Main Results:

• L. paracasei KBL382, KBL384, and KBL385 significantly downregulated mRNA for key glycolysis enzymes.
• Treatment with L. paracasei reduced mRNA levels of hypoxia-inducible factor 1-alpha (HIF1A) and inducible nitric oxide synthase (iNOS).
• L. paracasei induced arginase mRNA expression in stimulated macrophages.

Conclusions:

• L. paracasei strains effectively modulate macrophage metabolic pathways and polarization.
• These findings suggest L. paracasei's potential in controlling abnormal immune responses.
• Further research is warranted to explore L. paracasei as a probiotic or therapeutic agent for immune modulation.