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Related Experiment Videos

Vitamins and aging: pathways to NAD+ synthesis.

John M Denu1

  • 1Department of Biomolecular Chemistry, School of Medicine and Public Health, University of Wisconsin, 1300 University Avenue, Madison, WI 53706, USA. jmdenu@wisc.edu <jmdenu@wisc.edu>

Cell
|May 8, 2007
PubMed
Summary

Nicotinamide riboside, a novel NAD+ precursor, extends yeast lifespan by regulating Sir2 deacetylase activity. This life-extension effect is independent of calorie restriction, offering new insights into aging research.

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Area of Science:

  • Biochemistry
  • Genetics
  • Aging Research

Background:

  • Nicotinamide adenine dinucleotide (NAD+) is crucial for cellular metabolism and DNA repair.
  • Existing NAD+ synthesis pathways are well-documented, but recent evidence suggests additional salvage routes.
  • Understanding NAD+ metabolism is key to investigating aging and age-related diseases.

Purpose of the Study:

  • To investigate the role of nicotinamide riboside as a novel NAD+ precursor.
  • To determine if nicotinamide riboside affects the activity of Sir2 deacetylase.
  • To assess the impact of nicotinamide riboside on yeast lifespan and its relationship with calorie restriction.

Main Methods:

  • Utilized genetic evidence to identify new NAD+ salvage pathways.
  • Administered nicotinamide riboside to yeast models.
  • Measured Sir2 deacetylase activity.
  • Assessed yeast lifespan under different conditions, including calorie restriction.

Main Results:

  • Nicotinamide riboside was identified as a new NAD+ precursor.
  • Nicotinamide riboside was shown to regulate Sir2 deacetylase activity in yeast.
  • The administration of nicotinamide riboside significantly enhanced yeast lifespan.
  • The life-extending effect of nicotinamide riboside was observed irrespective of calorie restriction.

Conclusions:

  • Nicotinamide riboside represents a significant NAD+ precursor with implications for cellular health.
  • Regulation of Sir2 deacetylase by nicotinamide riboside is a key mechanism for lifespan extension.
  • This finding provides a novel, calorie restriction-independent strategy for modulating lifespan, opening new avenues in aging research.