Dietary inorganic nitrate reverses features of metabolic syndrome in endothelial nitric oxide synthase-deficient mice.
Level 5 - mechanism / opinion, no new human data
Animal model study (eNOS-deficient mice and rats)
PubMed 20876122 · doi:10.1073/pnas.1008872107
What was done
Endothelial nitric oxide synthase (eNOS)-deficient mice and rats were treated with dietary inorganic nitrate (sodium nitrate) at doses equivalent to normal endogenous eNOS-derived nitric oxide production (scaled to approximate high vegetable intake in humans). The authors measured tissue and plasma bioactive nitrogen oxides, visceral adiposity, circulating triglyceride levels, prediabetic markers, and blood pressure (including during NOS inhibition).
What was found
The abstract reports directional outcomes without exact numerical values or effect sizes. Chronic dietary nitrate supplementation increased tissue and plasma bioactive nitrogen oxide concentrations, decreased visceral fat accumulation, lowered circulating triglycerides, reversed the prediabetic phenotype in eNOS-deficient mice, and reduced blood pressure in rats both at baseline and under NOS inhibition.
Why it matters
This study shows that the non-enzymatic nitrate-nitrite-nitric oxide pathway can compensate for impaired endogenous eNOS function to improve metabolic and cardiovascular markers in rodents. It provides mechanistic support for dietary nitrate as a potential intervention for metabolic syndrome.
Limits
The study is restricted to rodent models (mice and rats), meaning findings cannot be directly applied to human clinical management without human trial validation. The abstract omits sample sizes, exact dosages, intervention durations, quantitative values, and variance data.
Cited by
- supports Endothelial nitric oxide synthase (eNOS) knockout mice spontaneously develop features of the metabolic syndrome.