Role, metabolism, chemical modifications and applications of hyaluronan.
Hyaluronan (hyaluronic acid, HA) is a linear naturally occurring polysaccharide formed from repeating disaccharide units of N-acetyl-D-glucosamine and D-glucuronate. Despite its relatively simple structure, HA is an extraordinarily versatile glycosaminoglycan currently receiving attention across a wide front of research areas. It has a very high molar mass, usually in the order of millions of Daltons, and possesses interesting visco-elastic properties based on its polymeric and polyelectrolyte characteristics. HA is omnipresent in the human body and in other vertebrates, occurring in almost all biological fluids and tissues, although the highest amounts of HA are found in the extracellular matrix of soft connective tissues. HA is involved in several key processes, including cell signaling, wound repair and regeneration, morphogenesis, matrix organization and pathobiology. Clinically, it is used as a diagnostic marker for many disease states including cancer, rheumatoid arthritis, liver pathologies, and as an early marker for impending rejection following organ transplantation. It is also used for supplementation of impaired synovial fluid in arthritic patients, following cataract surgery, as a filler in cosmetic and soft tissue surgery, as a device in several surgical procedures, particularly as an anti-adhesive following abdominal procedures, and also in tissue engineering. This review will provide an overview of the structure and physiological role of HA, as well as of its biomedical and industrial applications. Recent advances in biotechnological approaches for the preparation of HA-based materials, and as a component of tissue scaffolding for artificial organs will also be presented.
Department of Biologia Animale, University of Modena & Reggio Emilia, Via Campi 213/d, I-41100 Modena, Italy. volpi@unimo.it
Nicola
N
Volpi
Juergen
J
Schiller
Robert
R
Stern
Ladislav
L
Soltés
D000818:Animals; D006801:Humans; D006820:Hyaluronic Acid / Q000737:chemistry / Q000378:metabolism* / Q000494:pharmacology*; D006821:Hyaluronoglucosaminidase / Q000378:metabolism; D006868:Hydrolysis
D006820:Hyaluronic Acid; D006821:Hyaluronoglucosaminidase