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Tenopoulou M, Doulias PT, Nakamoto K, Berrios K, Zura G, Li C, Faust M, Yakovishina V, Evans P, Tan L, Bennett MJ, Snyder NW, Quinn WJ, Baur JA, Atochin DN, Huang PL, Ischiropoulos H. Oral nitrite restores age-dependent phenotypes in eNOS-null mice. JCI Insight 2018; 3:122156. [PMID: 30135317 DOI: 10.1172/jci.insight.122156] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Accepted: 07/11/2018] [Indexed: 01/01/2023] Open
Abstract
Alterations in the synthesis and bioavailability of NO are central to the pathogenesis of cardiovascular and metabolic disorders. Although endothelial NO synthase-derived (eNOS-derived) NO affects mitochondrial long-chain fatty acid β-oxidation, the pathophysiological significance of this regulation remains unclear. Accordingly, we determined the contributions of eNOS/NO signaling in the adaptive metabolic responses to fasting and in age-induced metabolic dysfunction. Four-month-old eNOS-/- mice are glucose intolerant and exhibit serum dyslipidemia and decreased capacity to oxidize fatty acids. However, during fasting, eNOS-/- mice redirect acetyl-CoA to ketogenesis to elevate circulating levels of β-hydroxybutyrate similar to wild-type mice. Treatment of 4-month-old eNOS-/- mice with nitrite for 10 days corrected the hypertension and serum hyperlipidemia and normalized the rate of fatty acid oxidation. Fourteen-month-old eNOS-/- mice exhibited metabolic derangements, resulting in reduced utilization of fat to generate energy, lower resting metabolic activity, and diminished physical activity. Seven-month administration of nitrite to eNOS-/- mice reversed the age-dependent metabolic derangements and restored physical activity. While the eNOS/NO signaling is not essential for the metabolic adaptation to fasting, it is critical for regulating systemic metabolic homeostasis in aging. The development of age-dependent metabolic disorder is prevented by low-dose replenishment of bioactive NO.
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Affiliation(s)
- Margarita Tenopoulou
- Children's Hospital of Philadelphia Research Institute, Philadelphia, Pennsylvania, USA
| | | | - Kent Nakamoto
- Children's Hospital of Philadelphia Research Institute, Philadelphia, Pennsylvania, USA
| | - Kiara Berrios
- Children's Hospital of Philadelphia Research Institute, Philadelphia, Pennsylvania, USA
| | - Gabriella Zura
- Children's Hospital of Philadelphia Research Institute, Philadelphia, Pennsylvania, USA
| | - Chenxi Li
- Children's Hospital of Philadelphia Research Institute, Philadelphia, Pennsylvania, USA
| | - Michael Faust
- Children's Hospital of Philadelphia Research Institute, Philadelphia, Pennsylvania, USA
| | - Veronika Yakovishina
- Children's Hospital of Philadelphia Research Institute, Philadelphia, Pennsylvania, USA
| | - Perry Evans
- Children's Hospital of Philadelphia Research Institute, Philadelphia, Pennsylvania, USA
| | - Lu Tan
- Children's Hospital of Philadelphia Research Institute, Philadelphia, Pennsylvania, USA
| | - Michael J Bennett
- Children's Hospital of Philadelphia Research Institute, Philadelphia, Pennsylvania, USA
| | - Nathaniel W Snyder
- A.J. Drexel Autism Institute, Drexel University, Philadelphia, Pennsylvania, USA
| | - William J Quinn
- Department of Physiology, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Joseph A Baur
- Department of Physiology, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Dmitriy N Atochin
- Cardiovascular Research Center Massachusetts General Hospital, Boston, Massachusetts, USA
| | - Paul L Huang
- Cardiovascular Research Center Massachusetts General Hospital, Boston, Massachusetts, USA
| | - Harry Ischiropoulos
- Children's Hospital of Philadelphia Research Institute, Philadelphia, Pennsylvania, USA
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