Extracellular matrix glycosaminoglycan (GAG)

Extracellular matrix glycosaminoglycans (GAGs) are long, unbranched polysaccharides composed of repeating disaccharide units, typically consisting of an amino sugar and a uronic acid or galactose [9, 14]. They are fundamental components of the extracellular matrix (ECM) and the cell surface glycocalyx, where they provide structural support, hydration, and resistance to compressive forces [1, 18]. Beyond their mechanical properties, GAGs serve as dynamic regulators of cellular behavior by binding and modulating the activity of various proteins, including growth factors, cytokines, and morphogens [4, 17]. This interaction influences critical biological processes such as cell signaling, proliferation, migration, and tissue morphogenesis [2, 6]. In various pathological conditions, the composition, concentration, and sulfation patterns of GAGs are significantly altered [3, 11]. These changes play pivotal roles in cancer progression, where GAGs facilitate angiogenesis and metastasis, as well as in chronic inflammatory diseases and neurodegenerative disorders [5, 13]. As a result, GAGs and their metabolic enzymes are increasingly recognized as valuable therapeutic targets [12, 15]. Current pharmacological interventions include the use of heparin as an anticoagulant, hyaluronic acid for osteoarthritis, and hyaluronidases to improve drug penetration in solid tumors [9, 19]. Ongoing research continues to explore GAG-based therapeutics and inhibitors of GAG-protein interactions to address a wide range of medical needs [10, 23].

Other names

MucopolysaccharideGlycosaminoglycanECM GAGGround substance glycosaminoglycan

Anticoagulation via antithrombin III activation; Viscosupplementation for joint lubrication; Competitive inhibition of growth factor and chemokine binding; Inhibition of viral attachment and entry; Enzymatic degradation of the extracellular matrix to enhance drug delivery; Neutralization of anionic charges.