PMID- 19887908 OWN - NLM STAT- MEDLINE DCOM- 20100203 LR - 20200930 IS - 1551-4005 (Electronic) IS - 1551-4005 (Linking) VI - 8 IP - 23 DP - 2009 Dec TI - The dendritic cell life cycle. PG - 3816-21 AB - Dendritic cells (DCs) are a special class of leukocytes actively involved in initiating innate and adaptive immune responses against invading pathogens. They play a fundamental role in determining both the type and efficiency of adaptive immune reactions. In particular, the efficiency of adaptive responses is strictly correlated with the survival of the DCs that have encountered the antigen. In physiological conditions, the rapid death of DCs by apoptosis after an encounter with a microbe is important to prevent both aberrant activation and autoimmunity. The mechanism leading to DC apoptosis after exposure to lipopolysaccharide (LPS) was recently elucidated, with activation of the c2 and c3 isoforms of nuclear factor of activated T cells (NFAT) playing a particularly important role in this process. In particular, the exposure of DCs to LPS induces the activation of Src-family kinases and phospholipase C (PLC)gamma2, the influx of extracellular Ca(2+) and calcineurin-dependent nuclear NFAT translocation. The initiation of this pathway is independent of TLR4 engagement and depends exclusively on CD14. We also consider here the possible role of CD14 in initiating this pathway and the way in which the c2 and c3 isoforms of NFAT exert their pro-apoptotic effects. FAU - Granucci, Francesca AU - Granucci F AD - Department of Biotechnology and Bioscience, University of Milano-Bicocca, Milan, Italy. francesca.granucci@unimib.it FAU - Zanoni, Ivan AU - Zanoni I LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Review DEP - 20091204 PL - United States TA - Cell Cycle JT - Cell cycle (Georgetown, Tex.) JID - 101137841 RN - 0 (Lipopolysaccharide Receptors) RN - 0 (Lipopolysaccharides) RN - 0 (NFATC Transcription Factors) RN - 0 (Toll-Like Receptor 4) RN - EC 2.7.10.2 (src-Family Kinases) RN - EC 3.1.3.16 (Calcineurin) RN - EC 3.1.4.3 (Phospholipase C gamma) RN - SY7Q814VUP (Calcium) SB - IM MH - Apoptosis MH - Calcineurin/metabolism MH - Calcium/metabolism MH - Dendritic Cells/cytology/*immunology MH - Lipopolysaccharide Receptors/metabolism MH - Lipopolysaccharides/pharmacology MH - NFATC Transcription Factors/metabolism/physiology MH - Phospholipase C gamma/metabolism MH - Toll-Like Receptor 4/metabolism MH - src-Family Kinases/metabolism RF - 58 EDAT- 2009/11/06 06:00 MHDA- 2010/02/04 06:00 CRDT- 2009/11/06 06:00 PHST- 2009/11/06 06:00 [entrez] PHST- 2009/11/06 06:00 [pubmed] PHST- 2010/02/04 06:00 [medline] AID - 9998 [pii] AID - 10.4161/cc.8.23.9998 [doi] PST - ppublish SO - Cell Cycle. 2009 Dec;8(23):3816-21. doi: 10.4161/cc.8.23.9998. Epub 2009 Dec 4.