title: Immunomodulating effects of cefodizime on Klebsiella pneumoniae-stimulated neutrophils.
abstract: To explore the immunoregulating effects of cefodizime on neutrophils and its mechanisms, we detected the expression of some cytokines secreted by neutrophils after heat-killed Klebsiella pneumoniae induced inflammation. We analyzed the changes of signal transduction in this process by detecting the mRNA expression of toll like receptor 4 (TLR4) and the inhibitor factor of kappaBalpha (I-kappaBalpha) expressed by neutrophils. The activity of nuclear factor kappaB (NF-kappaB) in neutrophils was also assayed by electrophoretic mobility shift assay (EMSA). We found cefodizime increased neutrophil production of TNF-alpha, IL-1beta in the early stage of inflammation, which was in agreement with the enhanced mRNA expression of TLR4 and DNA-binding activity of NF-kappaB. Taken together, the immunomodulating effects of cefodizime on cytokine production of K. pneumoniae stimulated neutrophils is possibly due to its regulation of TLR4 mRNA expression and DNA binding activities of NF-kappaB through the LPS-TLR4-NF-kappaB pathway.
authors.affiliation: Department of Pharmacology and Tumor Hospital, Shantou University Medical College, Guangdong 515041, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Song
authors.forename: Guanwu
authors.initials: G
authors.lastname: Li
authors.forename: Jing
authors.initials: J
authors.lastname: Ye
authors.forename: Fei
authors.initials: F
authors.lastname: Wan
authors.forename: Yuanshu
authors.initials: Y
authors.lastname: Qian
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D002439:Cefotaxime / Q000031:analogs & derivatives* / Q000494:pharmacology*; D016207:Cytokines / Q000096:biosynthesis; D007249:Inflammation / Q000209:etiology; D007711:Klebsiella pneumoniae / Q000276:immunology*; D008070:Lipopolysaccharides / Q000378:metabolism; D008562:Membrane Glycoproteins; D051379:Mice; D016328:NF-kappa B / Q000378:metabolism; D018375:Neutrophil Activation / Q000187:drug effects* / Q000276:immunology; D009504:Neutrophils / Q000276:immunology* / Q000378:metabolism; D011956:Receptors, Cell Surface; D015398:Signal Transduction / Q000187:drug effects; D051197:Toll-Like Receptor 4; D051193:Toll-Like Receptors
chemical_list: D000900:Anti-Bacterial Agents; D016207:Cytokines; D008070:Lipopolysaccharides; D008562:Membrane Glycoproteins; D016328:NF-kappa B; D011956:Receptors, Cell Surface; D051197:Toll-Like Receptor 4; D051193:Toll-Like Receptors; D002439:Cefotaxime; C033356:cefodizime