Publication (1) Glu Full Name
Glutamic acid
Glu Introduction
Glutamic acid (Glu), also known as L-glutamic acid by its biologically active isomeric form, is a naturally occurring acidic α-amino acid and a fundamental building block of proteins in all living organisms. Classified as a conditionally essential amino acid in humans, it is endogenously synthesized in sufficient quantities under normal physiological conditions but becomes essential during periods of severe stress, malnutrition, or early development (e.g., in preterm infants). Beyond its role in protein synthesis, glutamic acid is the primary excitatory neurotransmitter in the mammalian central nervous system (CNS) and a key intermediate in cellular metabolism, nitrogen balance, and immune regulation. Its multifunctional roles span biochemistry, neuroscience, nutrition, and clinical medicine, making it a widely studied molecule with critical physiological and practical implications across disciplines.
Figure 1. Strcuture of glutamic acid.
Clinical and Nutritional Applications
Clinical nutrition support: Glutamic acid (and its precursor glutamine) is a key component of enteral and parenteral nutrition for patients with malnutrition, severe stress (e.g., surgery, burns, trauma), cancer, or IBD. It promotes wound healing, maintains intestinal mucosal integrity, prevents muscle wasting, and supports immune function in critically ill patients. It is also added to infant formula for preterm infants to meet their essential amino acid needs.
Neurological therapeutics: Drugs targeting the glutamatergic system are used to treat CNS disorders: NMDA receptor antagonists (e.g., memantine) for Alzheimer's disease and moderate-to-severe dementia; AMPA receptor modulators for epilepsy and stroke; and GABA precursors (e.g., glutamic acid) for anxiety and epilepsy (to boost inhibitory signaling).
Metabolic and gastrointestinal treatment: Glutamic acid supplements are used to correct metabolic acidosis in CKD patients; glutamine derivatives treat intestinal mucosal damage in IBD and NEC.
Conclusion
Glutamic acid is a remarkably multifunctional acidic amino acid that occupies a central role in human biology, serving as a protein building block, the primary excitatory neurotransmitter in the CNS, a metabolic hub for energy and nitrogen balance, and a critical nutrient for immune and intestinal health. Its biological significance extends from basic cellular physiology to the pathophysiology of a wide range of diseases, and its practical applications span clinical medicine, nutrition, food science, and agriculture. While decades of research have elucidated the core functions and mechanisms of glutamic acid, many unanswered questions remain: the precise molecular mechanisms underlying glutamatergic system dysregulation in neuropsychiatric disorders, the tissue-specific regulation of glutamic acid metabolism, and the development of more selective glutamatergic drugs with fewer side effects. Future research will focus on clarifying these mechanisms, optimizing clinical nutrition strategies for vulnerable populations (e.g., preterm infants, critically ill patients), and developing novel targeted therapies for diseases driven by glutamic acid dysregulation—such as neurodegenerative disorders, diabetes, and IBD.
Alternate Names for Glu
D-Glutamic acid
138-15-8 (Unspecified hydrochloride)
2-Aminopentanedioic acid
2-Aminoglutaric acid
Glu
E
Glutamate
L glutamate
