Adipose expression of tumor necrosis factor-alpha: direct role in obesity-linked insulin resistance.
Level 5 - mechanism / opinion, no new human data
Bench and animal research with no human data
PubMed 7678183 · doi:10.1126/science.7678183
What was done
Researchers measured tumor necrosis factor-alpha (TNF-alpha) mRNA and protein expression in adipose tissue and systemically across four rodent models of obesity and diabetes. They also evaluated peripheral glucose uptake in response to insulin following neutralization of TNF-alpha in obese fa/fa rats.
What was found
TNF-alpha mRNA and protein were elevated locally in adipose tissue and systemically in four rodent models of obesity and diabetes. Neutralization of TNF-alpha in obese fa/fa rats resulted in a significant increase in peripheral glucose uptake in response to insulin. The abstract reports no exact numerical values or statistics.
Why it matters
This study provides mechanistic preclinical evidence directly linking adipose-derived TNF-alpha expression to obesity-induced insulin resistance.
Limits
The findings are derived entirely from rodent models with no human clinical data. The abstract lacks specific sample sizes, numerical effect sizes, variance estimates, and details on intervention duration.
Cited by
- contradicts Bruce McEwen was the first researcher to investigate the relationship between the immune system and insulin resistance.