NIN study links Vitamin D deficiency to heart cell damage

An ICMR-National Institute of Nutrition (NIN) study suggests that inadequate vitamin D levels may cause damage to heart cells at a cellular level. The research, published in the journal Steroids, used rat models and laboratory-grown rat heart cells to investigate the effects of normal, low and deficient levels of dietary vitamin D. The findings revealed that rats with vitamin D deficiency exhibited significantly higher levels of oxidative damage in heart tissue, lower levels of the antioxidant glutathione, reduced activity of important antioxidant enzymes, and impairment of the 'Nrf2 pathway', a critical cellular defense mechanism that helps the body counter oxidative stress.

These factors led to increased markers of endoplasmic reticulum stress, autophagy, and apoptosis in vitamin D-deficient hearts. Laboratory experiments showed similar results in rat cardiac cells, with oxidative stress exposure causing reduced survival and higher levels of cellular damage. Treatment with active vitamin D improved antioxidant responses and reduced markers of oxidative stress, ER stress, and apoptosis.

The study suggests that vitamin D may play a critical role beyond bone health, potentially maintaining healthy heart function. However, the ICMR-NIN director Bharati Kulkarni cautions against drawing direct conclusions for humans from the study, as it is based on animal and cell models. Further investigations in humans are required.