N-acetylaspartate (NAA)

N-acetylaspartate (NAA) is a highly abundant amino acid derivative found almost exclusively in the neurons of the vertebrate central nervous system [1, 6]. Synthesized in neuronal mitochondria from aspartate and acetyl-CoA, it serves as a critical metabolic intermediate that provides the acetate required for myelin lipid synthesis in oligodendrocytes and acts as a precursor for the neuropeptide N-acetylaspartylglutamate (NAAG) [6, 14]. NAA also functions as a neuronal osmolyte and has been implicated in mitochondrial energy production and protein stabilization [7, 12]. Clinically, NAA is the most prominent peak in proton magnetic resonance spectroscopy (1H-MRS) of the brain, making it a gold-standard biomarker for assessing neuronal integrity and viability in vivo [2, 4]. Decreased NAA levels are characteristic of various neurological conditions, including Alzheimer's disease, multiple sclerosis, and traumatic brain injury, while its pathological accumulation due to aspartoacylase (ASPA) deficiency leads to the fatal leukodystrophy known as Canavan disease [6, 14, 15]. Although not a traditional drug target, its levels are modulated by several neuropsychiatric medications, and the enzymes governing its metabolism are active areas of therapeutic research [13, 19].

Other names

N-acetyl-L-aspartateN-acetylaspartic acidAcetylaspartic acid

N-acetylaspartate serves as a metabolic source of acetate for myelination via cleavage by the enzyme aspartoacylase (ASPA) and as a precursor for the neuropeptide N-acetylaspartylglutamate (NAAG), which modulates glutamatergic signaling through mGluR3 receptors [6, 14]. It also acts as a molecular water pump for neuronal osmoregulation [12].