PMID- 12623845 OWN - NLM STAT- MEDLINE DCOM- 20030819 LR - 20210206 IS - 0006-4971 (Print) IS - 0006-4971 (Linking) VI - 102 IP - 1 DP - 2003 Jul 1 TI - Rapid recruitment of inflammatory monocytes is independent of neutrophil migration. PG - 328-35 AB - Early neutrophil entry into an inflammatory site is thought to mediate a chemokine switch, inducing subsequent monocyte recruitment through the regulation of monocyte chemoattractant protein-1 (MCP-1) release. As the murine monocyte is poorly characterized and difficult to identify, there has been little examination of either its early recruitment in inflammatory models or of the factors that influence its early migration. The phenotyping of rapidly recruited inflammatory leukocytes with 7/4 and Gr-1 monoclonal antibodies (mAbs) identifies 2 distinct populations, which we characterize as murine monocytes and neutrophils. Monocytes migrate in the first 2 hours of inflammation making use of alpha4beta1 but not of Mac-1 or lymphocyte function-associated antigen-1 (LFA-1) integrins. Early migration is dependent on MCP-1, but neither MCP-1 release nor monocyte recruitment is affected by the reduced neutrophil migration seen in LFA-1-/- mice. Endogenous peritoneal macrophages and mesothelial cells lining the peritoneum contain MCP-1, which is released following thioglycollate stimulation. The murine monocyte therefore responds rapidly to chemokines produced in situ by tissue cells at the site of inflammation with no requirement for prior influx of neutrophils. FAU - Henderson, Robert B AU - Henderson RB AD - Leukocyte Adhesion Laboratory, Cancer Research United Kingdom London Research Institute, Lincoln's Inn Fields Laboratories, London WC2A 3PX, UK. FAU - Hobbs, Josie A R AU - Hobbs JA FAU - Mathies, Meg AU - Mathies M FAU - Hogg, Nancy AU - Hogg N LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20030306 PL - United States TA - Blood JT - Blood JID - 7603509 RN - 0 (Chemokine CCL2) RN - 0 (Lymphocyte Function-Associated Antigen-1) RN - 143198-26-9 (Integrin alpha4) SB - IM MH - Animals MH - Cell Communication MH - Chemokine CCL2/analysis/biosynthesis MH - *Chemotaxis, Leukocyte MH - Inflammation/immunology/pathology MH - Integrin alpha4/physiology MH - Lymphocyte Function-Associated Antigen-1/physiology MH - Mice MH - Mice, Knockout MH - Monocytes/*cytology MH - *Neutrophil Infiltration MH - Peritonitis/immunology/pathology EDAT- 2003/03/08 04:00 MHDA- 2003/08/20 05:00 CRDT- 2003/03/08 04:00 PHST- 2003/03/08 04:00 [pubmed] PHST- 2003/08/20 05:00 [medline] PHST- 2003/03/08 04:00 [entrez] AID - S0006-4971(20)54013-5 [pii] AID - 10.1182/blood-2002-10-3228 [doi] PST - ppublish SO - Blood. 2003 Jul 1;102(1):328-35. doi: 10.1182/blood-2002-10-3228. Epub 2003 Mar 6.