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Effects of Pseudomonas aeruginosa mannose-sensitive hemagglutinin (PA-MSHA) pretreatment on septic rats.
- Source :
-
International Immunopharmacology . Nov2013, Vol. 17 Issue 3, p836-842. 7p. - Publication Year :
- 2013
-
Abstract
- Abstract: To evaluate the effects of Pseudomonas aeruginosa mannose-sensitive hemagglutinin (PA-MSHA) injection on the survival rate of rats post cecal ligation and puncture (CLP), Sprague–Dawley (SD) rats were subcutaneously injected with 0.125ml, 0.25ml or 0.5ml PA-MSHA for 8days or 16days before CLP. The survival rate and physiological appearance of rats in each group were monitored daily post CLP. The expression of Toll-like receptor 4 (TLR4) and cytokines related to inflammation was evaluated. We found that the 0.5ml-8d (0.5ml PA-MSHA injected for 8days) group had the highest 7-day survival rate (91.7%), which was significantly improved compared with the CLP-only group (33.3%). Furthermore, our results showed that PA-MSHA effectively increased serum pro-inflammatory mediators (TNF-α, IL-1β and IL-6) at the early stage (8days) but increased anti-inflammatory mediators (IL-4 and IL-10) at the late stage (16days). PA-MSHA significantly up-regulated the mRNA expression of TLR4 at 8 and 16days. After PA-MSHA pretreatment, CLP had no marked effect on the levels of most inflammatory factors. To explore potential protective mechanisms of PA-MSHA against CLP, we examined the effect of PA-MSHA on murine macrophage-like RAW264.7 cells and found that PA-MSHA induced endotoxin tolerance. In conclusion, this study suggested that precisely controlling the dosage and time of PA-MSHA administration can effectively increase the rat survival rate post CLP, which may be mediated through regulating inflammatory mediators and inducing endotoxin tolerance. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 15675769
- Volume :
- 17
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- International Immunopharmacology
- Publication Type :
- Academic Journal
- Accession number :
- 91727010
- Full Text :
- https://doi.org/10.1016/j.intimp.2013.09.006