PMID- 15162419 OWN - NLM STAT- MEDLINE DCOM- 20040729 LR - 20220331 IS - 0014-2980 (Print) IS - 0014-2980 (Linking) VI - 34 IP - 6 DP - 2004 Jun TI - Mini-review: The nuclear protein HMGB1 as a proinflammatory mediator. PG - 1503-12 AB - The intranuclear architectural protein that is termed high mobility group box chromosomal protein 1 (HMGB1) was recently identified as a potent proinflammatory mediator when present extracellularly. HMGB1 has been demonstrated to be a long-searched-for nuclear danger signal passively released by necrotic, as opposed to apoptotic, cells that will induce inflammation. Furthermore, HMGB1 can also be actively secreted by stimulated macrophages or monocytes in a process requiring acetylation of the molecule, which enables translocation from the nucleus to secretory lysosomes. Subsequent transport out of the cells depends on a secretion signal mediated by either extracellular lysophophatidyl-choline or ATP. HMGB1 passively released from necrotic cells and HMGB1 actively secreted by inflammatory cells are thus molecularly different. Extracellular HMGB1 acts as a cytokine by signaling via the receptor for advanced glycated end-products and via members of the Toll-like receptor family. The initiated inflammatory responses include the production of multiple cytokines, chemoattraction of certain stem cells, induction of vascular adhesion molecules and impaired function of intestinal epithelial cells. Therapeutic administration of HMGB1 antagonists rescues mice from lethal sepsis, even when initial treatment is delayed for 24 h after the onset of infection, establishing a clinically relevant therapeutic window that is significantly wider than for other known cytokines. FAU - Erlandsson Harris, Helena AU - Erlandsson Harris H AD - Department of Medicine, Rheumatology Unit, Karolinska Institutet, Stockholm, Sweden. Helena.Erlandsson.Harris@cmm.ki.se FAU - Andersson, Ulf AU - Andersson U LA - eng PT - Journal Article PT - Review PL - Germany TA - Eur J Immunol JT - European journal of immunology JID - 1273201 RN - 0 (HMGB1 Protein) RN - 0 (Membrane Glycoproteins) RN - 0 (Receptors, Cell Surface) RN - 0 (Toll-Like Receptors) SB - IM MH - Acetylation MH - Amino Acid Sequence MH - Animals MH - Cytoplasm/immunology MH - HMGB1 Protein/chemistry/*immunology MH - Humans MH - Inflammation/*immunology MH - Membrane Glycoproteins/*immunology MH - Mice MH - Molecular Sequence Data MH - Necrosis MH - Receptors, Cell Surface/*immunology MH - Sepsis/immunology MH - Signal Transduction/*immunology MH - Toll-Like Receptors RF - 73 EDAT- 2004/05/27 05:00 MHDA- 2004/07/30 05:00 CRDT- 2004/05/27 05:00 PHST- 2004/05/27 05:00 [pubmed] PHST- 2004/07/30 05:00 [medline] PHST- 2004/05/27 05:00 [entrez] AID - 10.1002/eji.200424916 [doi] PST - ppublish SO - Eur J Immunol. 2004 Jun;34(6):1503-12. doi: 10.1002/eji.200424916.