Obesity and metabolic dysfunction-associated fatty liver disease (MAFLD) are prevalent metabolic disorders with substantial global health implications that are often inadequately addressed by current treatments and may have side effects.
Probiotics have emerged as promising therapeutic agents owing to their beneficial effects on gut health and metabolism. This study investigated the synergistic effects of a probiotic combination of BNR17 and ABF21069 on obesity and MAFLD in C57BL/6 mice fed a high-sucrose diet. The probiotic combination significantly reduced body weight and fat accumulation compared with the high-sucrose diet. It also alleviated elevated serum leptin levels induced by a high-sucrose diet.
Histological analysis revealed a significant reduction in white adipose tissue and fatty liver in the mice treated with the probiotic combination. Furthermore, increased expression of genes related to β-oxidation, thermogenesis, and lipolysis suggested enhanced metabolic activity. The probiotic groups, particularly the BNR17 group, showed an increase in fecal exopolysaccharides, along with a tendency toward a lower expression of intestinal sugar transport genes, indicating reduced sugar absorption. Additionally, inflammatory markers in the liver tissue exhibited lower expression in the ABF21069 group than in the HSD group. Despite each strain in the combination group having distinct characteristics and functions, their combined effect demonstrated synergy in mitigating obesity and MAFLD, likely through the modulation of fecal exopolysaccharides content and improvement in lipid metabolism. These findings underscore the potential of probiotic supplementation as a promising assistant therapy for managing obesity and MAFLD and provide valuable insights into its therapeutic mechanisms in metabolic disorders.
Xanthorrhizol (XTZ), isolated from Curcuma xanthorrhiza,
has potent antifungal and antibacterial activity. It shows
very strong activity against Gram-positive bacteria, such as
Streptococcus mutans and Staphylococcus aureus, but is generally
not active against Gram-negative bacteria. In this study,
we explored the possibility of using a combination strategy
for expanding the antimicrobial spectrum of XTZ against
Gram-negative bacteria. To take advantage of XTZ being a
food-grade material, 10 food-grade or generally recognized
as safe (GRAS) antimicrobial compounds with low toxicities
were selected for combination therapy. In addition, polymyxin
B nonapeptide (PMBN), which is less toxic than polymyxin
B, was also selected as an outer membrane permeabilizer.
The antibacterial activity of various double or triple
combinations with or without XTZ were assayed in vitro
against four Gram-negative bacterial species (Escherichia
coli, Salmonella enterica serovar Typhi, Salmonella enterica
serovar Typhimurium, and Vibrio cholerae), with synergistic
combinations exhibiting clear activity subjected to further
screening. The combinations with the greatest synergism
were XTZ + PMBN + nisin, XTZ + PMBN + carvacrol, and
XTZ + PMBN + thymol. These combinations also showed
potent antimicrobial activity against Shigella spp., Yersinia
enterocolitica, and Acinetobacter baumannii. In time-kill
assays, the three combinations achieved complete killing of
E. coli within 2 h, and S. Typhi and V. cholera within 15 min.
This is the first report on expanding the activity spectrum
of XTZ against Gram-negative bacteria through combination with PMBN and food-grade or GRAS substances, with
the resulting findings being particularly useful for increasing
the industrial and medical applications of XTZ.
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