Regulation of mitochondrial function and energetics by reactive nitrogen oxides

Area of Science:

• Mitochondrial physiology and bioenergetics
• Nitric oxide (NO) metabolism and signaling
• Dietary inorganic nitrate and nitrite metabolism

Background:

• Endogenous nitric oxide (NO), synthesized from L-arginine, regulates mitochondrial function by interacting with cytochrome c oxidase.
• This NO-cytochrome c oxidase interaction triggers significant physiological and pathophysiological intracellular signaling.
• Emerging research highlights dietary nitrate and nitrite as precursors to NO, impacting cellular energetics.

Purpose of the Study:

• To review recent advances in understanding the roles of nitrate, nitrite, and NO in modulating mitochondrial function.
• To focus on the specific impact of dietary nitrate and exercise on these processes.
• To elucidate the mechanisms by which these nitrogen oxides affect cellular energetics and cytoprotection.

Main Methods:

• Literature review of recent research on nitric oxide, nitrate, and nitrite metabolism.
• Analysis of studies investigating the effects of dietary nitrate and nitrite on mitochondrial function.
• Examination of research linking exercise to altered nitric oxide bioavailability and mitochondrial responses.

Main Results:

• Inorganic nitrate and nitrite are metabolized in vivo to generate NO and other bioactive nitrogen oxides.
• These nitrogen oxides modulate mitochondrial respiration and ATP production, influencing cellular energetics.
• Dietary nitrate and exercise enhance NO bioavailability, potentially improving mitochondrial efficiency and cytoprotection.

Conclusions:

• Dietary nitrate and nitrite represent a significant source of endogenous NO, impacting mitochondrial function.
• NO, along with nitrate and nitrite, plays a crucial role in regulating cellular energetics and cytoprotection.
• Further research into dietary nitrate and exercise interventions holds promise for therapeutic strategies targeting mitochondrial health.