title: Efficiency of tazobactam/piperacillin in lethal peritonitis is enhanced after preconditioning of rats with O3/O2-pneumoperitoneum.
abstract: Insufflation of ozonized oxygen into the peritoneum (O3/O2-pneumoperitoneum [O3/O2-PP]) of rats reduced the lethality of peritonitis. We evaluated the prophylactic effect of O3/O2-PP combined with tazobactam/piperacillin (TZP) in polymicrobial lethal peritonitis. Wistar rats were conditioned by daily repeated insufflation of ozone for 5 days, and hematologic parameters were determined. Sepsis was induced by i.p. injection of cecal material derived from donor rats. Simultaneously, TZP was applied at a single dosage of 65 mg/kg or at two dosage schedules of 65 mg/kg each at an interval of 1 h. The conditioning effect of O3/O2-PP on the number of blood cells was measured before inoculation of bacteria. The mRNA levels of proinflammatory cytokine IL-lbeta and TNF-alpha were determined at 4 h post infection in spleen and liver by semiquantitative in situ hybridization analysis. Preconditioning of rats by O3/O2-PP enhanced the number of blood leukocytes and granulocytes and increased the survival rate of septic rats up to 33%. The combination of O3/O2-PP and TZP further enhanced the survival rate up to 93%. This effect was accompanied by a reduced amount of IL-1beta and TNF-alpha mRNA in spleen and liver. In contrast, in non-infected animals the combination of O3/O2-PP and TZP enhanced IL-1beta and TNF-alpha mRNA in the spleen and IL-1beta mRNA in liver when compared with TZP- and sham-treated controls. The preconditioning effect of O3/O2-PP seems to support the biological effectiveness of TZP by altering the immune status before and during the onset of sepsis. The combined therapy could be a simple, preoperative intervention for abdominal surgery to reduce postoperative morbidity and mortality.
authors.affiliation: Institute of Anatomy and Cell Biology, Philipps-University of Marburg, Marburg 35033, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Bette
authors.forename: Rolf M
authors.initials: RM
authors.lastname: Nüsing
authors.forename: Reinier
authors.initials: R
authors.lastname: Mutters
authors.forename: Zullyt B
authors.initials: ZB
authors.lastname: Zamora
authors.forename: Silvia
authors.initials: S
authors.lastname: Menendez
authors.forename: Siegfried
authors.initials: S
authors.lastname: Schulz
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000008:administration & dosage*; D004359:Drug Therapy, Combination; D004791:Enzyme Inhibitors / Q000008:administration & dosage*; D007375:Interleukin-1 / Q000096:biosynthesis; D008297:Male; D010126:Ozone / Q000008:administration & dosage / Q000633:toxicity; D010397:Penicillanic Acid / Q000008:administration & dosage / Q000031:analogs & derivatives*; D010538:Peritonitis / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D010878:Piperacillin / Q000008:administration & dosage*; D011027:Pneumoperitoneum / Q000139:chemically induced / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D051381:Rats; D017208:Rats, Wistar; D000078142:Tazobactam; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis
chemical_list: D000900:Anti-Bacterial Agents; D004791:Enzyme Inhibitors; D007375:Interleukin-1; D014409:Tumor Necrosis Factor-alpha; D010126:Ozone; D010397:Penicillanic Acid; D000078142:Tazobactam; D010878:Piperacillin