Vitamin C prevents stress-induced damage on the heart caused by the death of cardiomyocytes, through down-regulation of the excessive production of catecholamine, TNF-α, and ROS production in Gulo(-/-)Vit C-Insufficient mice.
Level 5 - mechanism / opinion, no new human data
Preclinical animal research using a knockout mouse model
PubMed 23886864 · doi:10.1016/j.freeradbiomed.2013.07.023
What was done
Researchers exposed Gulo(-/-) knockout mice, which cannot synthesize vitamin C internally, to daily stress (1 hour per day) under vitamin C-insufficient conditions. They evaluated cardiac function (heartbeat and cardiac output), catecholamine levels (adrenaline and noradrenaline), structural heart changes, cardiomyocyte apoptosis, matrix metalloproteinase expression (MMP-2 and MMP-9), lipid peroxidation, tumor necrosis factor-alpha (TNF-α) production, and 2-week survival, comparing unsupplemented mice to those given sufficient vitamin C supplementation.
What was found
In vitamin C-insufficient mice, daily stress exposure reduced heartbeat and cardiac output, despite marked increases in adrenaline and noradrenaline. Stressed deficient mice also demonstrated cardiomyocyte death, upregulated MMP-2 and MMP-9, elevated lipid peroxidation, and increased cardiac TNF-α. All vitamin C-insufficient mice died within 2 weeks (no exact numerical values or effect sizes provided in the abstract). Adequate vitamin C supplementation completely prevented all observed functional deficits, biochemical alterations, and mortality.
Why it matters
The study provides mechanistic evidence in an animal model lacking endogenous ascorbic acid synthesis that severe vitamin C insufficiency leaves cardiac tissue vulnerable to lethal stress-induced catecholamine and oxidative injury.
Limits
This is an animal study using genetically engineered knockout mice, so findings cannot be directly applied to human cardiovascular pathophysiology. The abstract does not disclose the sample size (n), baseline nutritional levels, or quantitative numerical data.
Cited by
- supports In vitamin C-deficient mice with elevated pro-inflammatory cytokines, vitamin C administration normalizes cytokine production.