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Am J Physiol Heart Circ Physiol. 2019 Jun 1;316(6):H1253-H1266. doi: 10.1152/ajpheart.00039.2019. Epub 2019 Mar 15.

Role of endothelial NAD+ deficiency in age-related vascular dysfunction.

Author information

1
Vascular Cognitive Impairment and Neurodegeneration Program, Reynolds Oklahoma Center on Aging, Department of Geriatric Medicine, University of Oklahoma Health Sciences Center , Oklahoma City, Oklahoma.
2
Department of Medical Physics and Informatics, University of Szeged , Szeged , Hungary.
3
Theoretical Medicine Doctoral School, University of Szeged , Szeged , Hungary.
4
Department of Physiology and Institute for Diabetes, Obesity, and Metabolism, Perelman School of Medicine, University of Pennsylvania , Philadelphia, Pennsylvania.
5
Department of Pulmonology, Semmelweis University , Budapest , Hungary.
6
Department of Health Promotion Sciences, Hudson College of Public Health, University of Oklahoma Health Sciences Center , Oklahoma City, Oklahoma.

Abstract

Age-related alterations in endothelium and the resulting vascular dysfunction critically contribute to a range of pathological conditions associated with old age. To develop therapies rationally that improve vascular health and thereby increase health span and life span in older adults, it will be essential to understand the cellular and molecular mechanisms contributing to vascular aging. Preclinical studies in model organisms demonstrate that NAD+ availability decreases with age in multiple tissues and that supplemental NAD+ precursors can ameliorate many age-related cellular impairments. Here, we provide a comprehensive overview of NAD+-dependent pathways [including the NAD+-using silent information regulator-2-like enzymes and poly(ADP-ribose) polymerase enzymes] and the potential consequences of endothelial NAD+ deficiency in vascular aging. The multifaceted vasoprotective effects of treatments that reverse the age-related decline in cellular NAD+ levels, as well as their potential limitations, are discussed. The preventive and therapeutic potential of NAD+ intermediates as effective, clinically relevant interventions in older adults at risk for ischemic heart disease, vascular cognitive impairment, and other common geriatric conditions and diseases that involve vascular pathologies (e.g., sarcopenia, frailty) are critically discussed. We propose that NAD+ precursors [e.g., nicotinamide (Nam) riboside, Nam mononucleotide, niacin] should be considered as critical components of combination therapies to slow the vascular aging process and increase cardiovascular health span.

KEYWORDS:

endothelial dysfunction; geroscience; microcirculation; oxidative stress; senescence

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