The Regulatory Role of NAD in Human and Animal Cells.
Level 5 - mechanism / opinion, no new human data
Narrative review of biochemical mechanisms and preclinical models without primary human data.
PubMed 30200865 · doi:10.1134/S0006297918070040
What was done
This narrative review summarizes literature regarding the metabolic and signaling roles of nicotinamide adenine dinucleotide (NAD) and NADP in human and animal cells. Based on the abstract, it examines NAD-dependent redox pathways, regulatory enzymes consuming NAD+ (sirtuins, ADP-ribosyltransferases, poly(ADP-ribose) polymerases), dietary precursor biosynthesis (nicotinamide, nicotinic acid, nicotinamide riboside, nicotinic acid riboside), and preclinical disease models.
What was found
The abstract reports no numerical data or quantitative metrics. It qualitatively summarizes NAD+ as a critical coenzyme, secondary messenger precursor, and substrate for enzymes controlling DNA repair, gene expression, apoptosis, mitochondrial biogenesis, and the unfolded protein response. It notes that precursor administration restores tissue NAD levels and produces beneficial effects in preclinical models of neurodegenerative disorders, obesity, diabetes, and metabolic syndrome.
Why it matters
The review synthesizes the mechanistic basis for how cellular NAD maintenance influences fundamental regulatory networks. It outlines the biochemical rationale supporting research into NAD precursors for metabolic and neurodegenerative conditions.
Limits
The abstract presents no quantitative data and no primary human clinical trials. As a narrative review, it does not detail systematic search protocols, inclusion criteria, or study quality assessments. Reported therapeutic benefits are restricted to preclinical models.
Cited by
- supports Sirtuins require NAD as a cofactor/fuel to regulate gene expression and repair broken DNA.