Hydrogen nuclei and metabolites

Hydrogen nuclei (protons) and various small-molecule metabolites are the primary subjects of magnetic resonance imaging (MRI) and magnetic resonance spectroscopy (MRS) (NIBIB, 2022). In a biological context, hydrogen nuclei are ubiquitous, primarily found in water and lipid molecules, and their intrinsic magnetic spin allows for the non-invasive visualization of internal anatomy and pathological changes (StatPearls, 2023). Metabolites such as N-acetylaspartate (NAA), choline, and lactate serve as critical indicators of neuronal health, membrane turnover, and metabolic shifts, respectively (Radiopaedia, 2023). While these entities are essential for diagnostic imaging and monitoring treatment efficacy, they do not serve as therapeutic targets for pharmacological agents. Instead, they function as endogenous biomarkers that reflect the biochemical environment and physiological state of tissues in various diseases, including oncology and neurology (PubMed, 2021). Consequently, they are utilized for patient stratification and efficacy monitoring rather than as sites for drug intervention.

Other names

Protons1HMRS metabolitesEndogenous metabolic biomarkersMagnetic resonance spectroscopy metabolites

Paramagnetic contrast agents interact with hydrogen nuclei to shorten T1 and T2 relaxation times, thereby enhancing signal intensity and contrast in magnetic resonance imaging (NIH, 2022).