title: Intraperitoneal injection of lipopolysaccharide induces dynamic migration of Gr-1high polymorphonuclear neutrophils in the murine abdominal cavity.
abstract: Intraperitoneal injection of lipopolysaccharide (LPS; 100 microg) in mice resulted in the disappearance of almost all proteose peptone-induced polymorphonuclear neutrophils (PMNs) with high-level fluorescence for the cell surface marker Gr-1 (Gr-1(high)) at 15 min postinjection, followed by doubling of their proportion at 30 min postinjection. High staining levels of 3'-acetyl-2'-carboxyl-6',7'-(dihyropyran-2'-one)-5 or 6-carboxyfluorescein diacethoxylmethyl ester-labeled PMNs injected into the peritoneal cavity were detected in mesenteric lymph nodes 15 min postinjection of LPS. Therefore, the time of decrease of Gr-1(high) PMNs coincided with that of the increase in cell accumulation in mesenteric lymph nodes. Since milk fat globule-EGF factor 8 (MFG-E8), which is secreted by macrophages, bound many PMNs exhibiting Gr-1(high) and Gr-1(medium) at 30 min postinjection of LPS, the staining level of annexin V on those cells was very low because its binding site is the same as the receptor for MFG-E8. At 60 min postinjection of LPS, the proportion of Gr-1(high) PMNs decreased, and almost all Gr-1(medium) PMNs tended to shift to the right compared with those at 30 min postinjection. The geomeans of Toll-like receptor 4 (TLR4) expression on PMNs at 15, 30, and 60 min postinjection of LPS were 63, 66, and 24%, respectively, compared with that on normal PMNs, indicating that the expression of TLR4 decreases in response to exposure to LPS. Our results suggest that LPS induced PMN death and that many PMNs expressing Gr-1(high) undergo apoptosis 180 min postinjection of LPS.
authors.affiliation: Department of Microbiology, Toho University School of Medicine, Omori-nishi 5-21-16, Ota-ku, Tokyo 143-8540, Japan. shuichi@med.toho-u.ac.jp
authors.forename: Shuichi
authors.initials: S
authors.lastname: Miyazaki
authors.forename: Fumio
authors.initials: F
authors.lastname: Ishikawa
authors.forename: Toshihiko
authors.initials: T
authors.lastname: Fujikawa
authors.forename: Shigekazu
authors.initials: S
authors.lastname: Nagata
authors.forename: Keizo
authors.initials: K
authors.lastname: Yamaguchi
mesh_terms: D034841:Abdominal Cavity; D000818:Animals; D000943:Antigens, Differentiation / Q000032:analysis / Q000378:metabolism*; D000954:Antigens, Surface / Q000378:metabolism; D017209:Apoptosis / Q000187:drug effects; D002364:Caseins / Q000494:pharmacology; D002452:Cell Count; D002465:Cell Movement / Q000187:drug effects*; D002470:Cell Survival / Q000187:drug effects; D017690:Cell Transplantation; D005434:Flow Cytometry; D015870:Gene Expression / Q000187:drug effects; D007274:Injections, Intraperitoneal; D007375:Interleukin-1 / Q000032:analysis / Q000097:blood / Q000494:pharmacology; D016753:Interleukin-10 / Q000032:analysis / Q000097:blood; D015850:Interleukin-6 / Q000032:analysis / Q000097:blood; D008070:Lipopolysaccharides / Q000494:pharmacology*; D008198:Lymph Nodes / Q000166:cytology; D008297:Male; D008562:Membrane Glycoproteins / Q000032:analysis / Q000378:metabolism; D008643:Mesentery / Q000166:cytology; D051379:Mice; D008807:Mice, Inbred BALB C; D008894:Milk Proteins / Q000378:metabolism; D009504:Neutrophils / Q000166:cytology / Q000187:drug effects* / Q000637:transplantation; D010446:Peptide Fragments / Q000494:pharmacology; D010529:Peritoneal Cavity / Q000166:cytology; D010533:Peritoneal Lavage; D011956:Receptors, Cell Surface / Q000032:analysis / Q000378:metabolism; D051197:Toll-Like Receptor 4; D051193:Toll-Like Receptors; D014409:Tumor Necrosis Factor-alpha / Q000032:analysis / Q000494:pharmacology
chemical_list: D000943:Antigens, Differentiation; D000954:Antigens, Surface; D002364:Caseins; D007375:Interleukin-1; D015850:Interleukin-6; D008070:Lipopolysaccharides; D008562:Membrane Glycoproteins; C490919:Mfge8 protein, mouse; D008894:Milk Proteins; D010446:Peptide Fragments; D011956:Receptors, Cell Surface; D051197:Toll-Like Receptor 4; D051193:Toll-Like Receptors; D014409:Tumor Necrosis Factor-alpha; C046168:neutrophil differentiation antigens; C018135:proteose-peptone; D016753:Interleukin-10