The discovery study, published in the Journal of Gerontology: Biological Sciences, used 24-month-old rats that ate 35% less food for eight weeks. Researchers measured changes in protein phosphorylation and insulin-stimulated glucose uptake by muscle tissue to see how calorie restriction affects muscle insulin sensitivity.
Calorie restriction enhanced insulin-stimulated glucose uptake in both males and females, but females had greater uptake than males regardless of diet. Insulin changed phosphorylation on more than twice as many protein sites in females compared to males, with 60 sites altered in both sexes. In contrast, calorie restriction changed phosphorylation on about 30% more protein sites in males compared to females.
The study identified two proteins, Lmod1 and Ehbp1l1, whose insulin-responsive phosphorylation sites correlated with glucose uptake across individuals. The authors note these proteins have known genetic links to human glycemic traits and could be therapeutic targets for type 2 diabetes. The team also measured about 1,000 metabolites and found about 40% changed with calorie restriction within each sex.
Difficult words
- restriction — The act of limiting or controlling something.
- sensitivity — The quality of being sensitive; responsiveness.
- implication — A possibility that may happen as a result.implications
- enhance — To improve or make something better.
- mechanism — A system or process that produces an effect.mechanisms
- intervention — Actions taken to improve a situation.interventions
Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.
Discussion questions
- What do you think about sex-specific approaches in medicine?
- How could future research change diabetes treatments?
- Why is understanding biological mechanisms important for health?
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