PMID- 11200064 OWN - NLM STAT- MEDLINE DCOM- 20010322 LR - 20091119 IS - 0741-5400 (Print) IS - 0741-5400 (Linking) VI - 69 IP - 1 DP - 2001 Jan TI - MAP kinase activation in macrophages. PG - 3-10 AB - Stimulation of macrophages by a variety of agents causes activation of mitogen-activated protein kinases (MAPKs). Activation of MAPKs by lipopolysaccharide involves CD14 and Toll receptors. Subsequent steps still remain to be explored. Tumor necrosis factor-alpha (TNF-alpha)-induced activation of MAPKs has been shown to involve the death domain proteins (TRADD, FADD, MADD) and TRAFs. Other molecules involved in this pathway include the protein kinases, ASK1, germinal center kinase (GCK), hematopoietic progenitor kinase 1 (HPK1), and GCK-related kinase (GCKR). Although, these pathways have been described in various cell types, their role in macrophages remains to be established. The availability of knockout mice and constitutively active and dominant-negative mutants of MAPKs should greatly enhance our understanding of this field. The activation of MAPKs seems to be different in cell lines compared with primary cells. Among the macrophages, cells from different compartments show different expression of receptors and signal transduction molecules. These differences may account for differences in MAPK activation and other phenotypic differences in macrophages from different compartments. Therefore, it is important to use primary cells for studying MAPK signal-transduction pathways, and the data from cell lines should not be extrapolated to primary cells. FAU - Rao, K M AU - Rao KM AD - Pathology and Physiology Research Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, West Virginia, USA. mir8@cdc.gov LA - eng PT - Journal Article PT - Review PL - England TA - J Leukoc Biol JT - Journal of leukocyte biology JID - 8405628 RN - EC 2.7.11.24 (Mitogen-Activated Protein Kinases) SB - IM MH - Animals MH - Humans MH - MAP Kinase Signaling System MH - Macrophage Activation/*physiology MH - Macrophages/*physiology MH - Mitogen-Activated Protein Kinases/*physiology MH - Signal Transduction RF - 117 EDAT- 2001/02/24 12:00 MHDA- 2001/03/27 10:01 CRDT- 2001/02/24 12:00 PHST- 2001/02/24 12:00 [pubmed] PHST- 2001/03/27 10:01 [medline] PHST- 2001/02/24 12:00 [entrez] PST - ppublish SO - J Leukoc Biol. 2001 Jan;69(1):3-10.