Physiological and pathophysiological outcomes of the interactions of HMGB1 with cell surface receptors

Biochimica Et Biophysica Acta
Heikki Rauvala, Ari Rouhiainen

Abstract

Extracellularly occurring HMGB1, either released during cell injury or actively secreted from cells, has profound effects on behaviour of a wide variety of cell types. Extracellular HMGB1 regulates migratory responses of many cell types, including neuron and growth cone migration, invasive migration of tumour cells, and migration of endothelial and immune cells. RAGE (Receptor for Advanced Glycation End Products) plays a key role as a cell surface receptor in most, if not all HMGB1-dependent migration mechanisms. HMGB1 binds to the distal immunoglobulin-like domain of RAGE, activating a signalling pathway that ends up in modulation of the cytoskeleton for regulation of cell motility. In addition to RAGE, proteoglycans and sulfated carbohydrate epitopes of glycolipids and glycoproteins may play a role as cell surface binding sites of HMGB1, affecting migratory behaviour of cells. In addition to physiological and pathophysiological cell migration control, HMGB1 has been widely studied as a molecule linking tissue injury to inflammatory mechanisms. HMGB1 by itself has little if any proinflammatory activity but it appears to activate innate immunity mechanisms as a complex with DNA, lipids and/or proinflammatory cytokines. The infl...Continue Reading

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