Description
NAD+ (Nicotinamide Adenine Dinucleotide)
Chemical Classification: Coenzyme / Pyridine Nucleotide
Research Overview
NAD+ is a critical coenzyme found in all living cells, existing in two forms: an oxidized form (NAD+) and a reduced form (NADH). In molecular biology and metabolic research, it is classified as a redox cofactor. It is a primary subject in studies exploring the mechanisms of electron transfer in the mitochondrial respiratory chain and serves as an essential substrate for enzymes such as sirtuins and poly(ADP-ribose) polymerases (PARPs), which govern genomic stability and cellular longevity signaling.
Common Research Applications
This pyridine nucleotide is frequently utilized in laboratory models to investigate the following experimental objectives:
- Mitochondrial Bioenergetics:Research focusing on the NAD+/NADH ratio and its role in the Citric Acid Cycle (Krebs Cycle) and Oxidative Phosphorylation for ATP production.
- Sirtuin Activation (SIRT1-7):Investigations into the NAD+-dependent activation of sirtuins, which regulate metabolic homeostasis, DNA repair, and protein deacetylation.
- DNA Integrity and PARP Activity:Studies regarding the consumption of NAD+ by PARP enzymes in response to DNA strand breaks and the subsequent influence on cellular repair pathways.
- Circadian Rhythm Modulation:Research exploring the interaction between NAD+ salvage pathways and the molecular clock genes (e.g., CLOCK and BMAL1).
- Senescence and Aging Models:Exploration of the “NAD+ Decline” hypothesis in aged cellular environments and the impact of NAD+ replenishment on the senescence-associated secretory phenotype (SASP).
Laboratory Handling & Storage
- Appearance:Lyophilized white to off-white powder.
- Solubility:Highly soluble in water and aqueous buffers; easily reconstituted in sterile water or phosphate-buffered saline (PBS).
- Stability:NAD+ is hygroscopic and sensitive to light and heat. Lyophilized powder must be stored at -20°C in an airtight container for long-term preservation.