Document Detail


Dietary polyunsaturated fatty acids increase survival and decrease bacterial load during septic S. aureus infection, and improve neutrophil function in mice.
MedLine Citation:
PMID:  25404025     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Severe infection, including sepsis, is an increasing clinical problem that causes prolonged morbidity and substantial mortality. At present, antibiotics are essentially the only pharmacological treatment for sepsis. The incidence of resistance to antibiotics is increasing and it is therefore critical to find new therapies for sepsis. Staphylococcus aureus (S. aureus) is a major cause of septic mortality. Neutrophils play an important role in the defense against bacterial infections. We have shown that a diet with high levels of dietary saturated fatty acids decreases survival in septic mice, but the mechanisms behind remain elusive. The aim of the present study was to investigate how the differences in dietary fat composition affect survival and bacterial load after experimental septic infection and neutrophil function in uninfected mice. We found that, after S. aureus infection, mice fed polyunsaturated high fat diet (HFD/P) for 8 weeks had increased survival and decreased bacterial load during sepsis compared with mice fed saturated high fat diet (HFD/S), and similar to that of mice fed low fat diet (LFD). Uninfected mice fed HFD/P had increased frequency of neutrophils in bone marrow compared with mice fed HFD/S. In addition, mice fed HFD/P had a higher frequency of neutrophils recruited to the site of inflammation in response to peritoneal injection of thioglycollate compared with HFD/S. Differences between the proportion of dietary protein and carbohydrate did not affect septic survival at all. In conclusion, polyunsaturated dietary fat increased both survival and efficiency of bacterial clearance during septic S. aureus infection. Moreover, this diet increased the frequency and chemotaxis of neutrophils, key components of the immune response to S. aureus infections.
Authors:
Sara Svahn; Louise Grahnemo; Vilborg Pálsdóttir; Intawat Nookaew; Karl Wendt; Britt Gabrielsson; Erik Schéle; Anna Benrick; Niklas Andersson; Staffan Nilsson; Maria E Johansson; John-Olov Jansson
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-11-17
Journal Detail:
Title:  Infection and immunity     Volume:  -     ISSN:  1098-5522     ISO Abbreviation:  Infect. Immun.     Publication Date:  2014 Nov 
Date Detail:
Created Date:  2014-11-18     Completed Date:  -     Revised Date:  2014-11-19    
Medline Journal Info:
Nlm Unique ID:  0246127     Medline TA:  Infect Immun     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2014, American Society for Microbiology. All Rights Reserved.
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