S3QELs protect against diet-induced intestinal barrier dysfunction.

Area of Science:

• Mitochondrial biology
• Aging research
• Gastroenterology

Background:

• Aging is linked to decreased intestinal homeostasis and barrier disruption, potentially exacerbated by nutrient-rich diets.
• Mitochondrial complex III (MT-CO3) is a source of reactive oxygen species (ROS), specifically superoxide, implicated in cellular damage.
• Small-molecule suppressors of site III_Qo electron leak (S3QELs) mitigate superoxide production at MT-CO3 without affecting oxidative phosphorylation.

Purpose of the Study:

• To investigate the role of mitochondrial superoxide in diet-induced intestinal barrier disruption.
• To evaluate the protective effects of S3QELs against high-nutrient diet-induced gut pathology and lifespan reduction.
• To determine if S3QELs can ameliorate high-fat diet-induced intestinal permeability in mice.

Main Methods:

• Administration of S3QELs to Drosophila melanogaster fed a high-nutrient diet.
• Assessment of intestinal permeability, enterocyte apoptosis, and median lifespan in treated flies.
• Hif-1α knockdown experiments in Drosophila enterocytes.
• Administration of S3QELs to mice fed a high-fat diet.
• Measurement of intestinal permeability in treated mice.

Main Results:

• S3QEL treatment protected Drosophila against increased intestinal permeability, enterocyte apoptosis, and reduced lifespan associated with high-nutrient diets.
• Hif-1α knockdown in enterocytes conferred protection and abolished further benefits from S3QELs.
• S3QELs mitigated the high-fat diet-induced increase in intestinal permeability in mice.

Conclusions:

• Superoxide generated by mitochondrial complex III in enterocytes contributes to diet-induced intestinal barrier disruption.
• S3QELs represent a potential therapeutic strategy for mitigating age-related and diet-induced gut barrier dysfunction.
• Targeting mitochondrial ROS production offers a novel approach to enhance intestinal health and potentially lifespan.