Template to improve glycemic control without reducing adiposity or dietary fat

Area of Science:

• Virology
• Metabolic Diseases
• Endocrinology

Background:

• Chronic hyperglycemia and hepatic steatosis are significant health concerns.
• Current treatments often rely on insulin signaling or dietary modifications.
• Novel therapeutic targets independent of these pathways are highly desirable.

Purpose of the Study:

• To investigate the in vivo efficacy of human adenovirus Ad36 in improving glycemic control.
• To determine if natural Ad36 infection in humans is associated with better metabolic health.
• To explore the underlying mechanisms of Ad36's metabolic effects.

Main Methods:

• Ad36 or control adenovirus infection in chow-fed and high-fat diet-induced diabetic mice.
• Assessment of glycemic control, hepatic lipid content, and insulin signaling pathways post-infection.
• Screening of 1,507 human sera for Ad36 antibodies to indicate past natural infection.

Main Results:

• Ad36 significantly improved glycemic control in both chow-fed and high-fat diet-fed mice.
• Ad36 reduced hepatic steatosis in high-fat diet-fed mice.
• Ad36 enhanced distal insulin signaling, increasing glucose uptake in adipose tissue and skeletal muscle, and reducing hepatic glucose release.
• In humans, Ad36 infection correlated with better glycemic control and lower hepatic lipid content, independent of confounders.

Conclusions:

• Ad36 promotes glucose uptake and improves glycemic control independently of proximal insulin signaling and adiposity.
• Ad36 effectively reduces hepatic steatosis, even under high-fat diet conditions.
• Ad36 represents a promising tool for understanding and developing novel anti-diabetic strategies targeting hyperglycemia and hepatic steatosis.