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High levels of dietary nitrate might in part explain the vascular benefits of diets rich in leafy greens

Date:
March 24, 2011
Source:
Journal of Clinical Investigation
Summary:
Nitric oxide (NO) helps maintain the health of vasculature. NO is synthesized by an enzyme called nitric oxide synthase (NOS). In a new study, researchers determined that after vessel injury, the NOS pathway is disrupted, but a secondary pathway that generates NO from nitrate is activated. This suggests that high levels of dietary nitrate might in part explain the vascular benefits of diets rich in leafy greens.

Disorders of the circulatory system -- vascular diseases -- are common in the developed world, and can lead to heart attacks, strokes and even death. However, treatments for these disorders, such as bypass surgery and angioplasty, themselves induce vascular injury, after which the cells of the blood vessel can over-proliferate in a way that limits blood flow.

Nitric oxide (NO) is an important molecule that helps maintain the contractility and health of vascular smooth muscle cells, and multiple studies have linked vascular pathology to a decreased level of NO. Therefore, therapies that increase the availability of NO could help protect vascular health.

NO is synthesized from arginine by an enzyme called nitric oxide synthase (NOS). In new research, Brian Zuckerbraun and colleagues, of the University of Pittsburgh, in Pittsburgh, Pennsylvania, determined that after vessel injury in the rat, the NOS pathway is disrupted, but a secondary pathway that generates NO from nitrate is activated. Furthermore, supplementing rats with nitrate before inducing vessel injury markedly limited the extent of the damage, while a diet low in nitrate exacerbated it.

In the accompanying commentary, John Cooke and Yohannes Ghebremariam of Stanford University in Stanford, California point out that high levels of dietary nitrate might in part explain the vascular benefits of diets rich in leafy greens, but warn that high dose supplementation could lead to the generation of carcinogenic molecules.

The research is published in the Journal of Clinical Investigation.


Story Source:

The above story is based on materials provided by Journal of Clinical Investigation. Note: Materials may be edited for content and length.


Journal References:

  1. Matthew J. Alef, Raghuveer Vallabhaneni, Evie Carchman, Sidney M. Morris, Sruti Shiva, Yinna Wang, Eric E. Kelley, Margaret M. Tarpey, Mark T. Gladwin, Edith Tzeng, Brian S. Zuckerbraun. Nitrite-generated NO circumvents dysregulated arginine/NOS signaling to protect against intimal hyperplasia in Sprague-Dawley rats. Journal of Clinical Investigation, 2011; DOI: 10.1172/JCI44079
  2. John P. Cooke, Yohannes T. Ghebremariam. Dietary nitrate, nitric oxide, and restenosis. Journal of Clinical Investigation, 2011; DOI: 10.1172/JCI57193

Cite This Page:

Journal of Clinical Investigation. "High levels of dietary nitrate might in part explain the vascular benefits of diets rich in leafy greens." ScienceDaily. ScienceDaily, 24 March 2011. <www.sciencedaily.com/releases/2011/03/110323135631.htm>.
Journal of Clinical Investigation. (2011, March 24). High levels of dietary nitrate might in part explain the vascular benefits of diets rich in leafy greens. ScienceDaily. Retrieved September 15, 2014 from www.sciencedaily.com/releases/2011/03/110323135631.htm
Journal of Clinical Investigation. "High levels of dietary nitrate might in part explain the vascular benefits of diets rich in leafy greens." ScienceDaily. www.sciencedaily.com/releases/2011/03/110323135631.htm (accessed September 15, 2014).

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