Abstract
The sphingosine kinase 1 (SphK1)/sphingosine-1-phosphate (S1P) pathway plays a key role in inflammation. Parenteral nutrition containing n-3 polyunsaturated fatty acids (n-3 PUFA) may regulate inflammatory reactions. The aim of this study is to determine whether n-3 PUFA may improve inflammatory responses by neutralizing SphK1 signaling. Rat models of parenteral nutrition, cecal ligation and puncture (CLP)-induced sepsis were generated. Male Sprague–Dawley rats were operated for CLP on day 2 after venous catheterization. The rats were randomized to receive normal saline (NS; n = 20), parenteral nutrition (PN; n = 20), or PN + fish oil (FO; n = 20) for 5 days. The daily intake of fish oil (1.25–2.82 g EPA and 1.44–3.09 g DHA per 100 ml) in the FO group was approximately 1.8 g/kg body weight/day. Rats in the control group (n = 10) were subjected to sham operation and received a chow diet. Spleen tissues were collected for SphK1 and S1P receptor expression analysis. Our data showed that n-3 PUFA ameliorated the survival rate. SphK1 expression and its enzymatic activity were significantly upregulated in sepsis rats. Furthermore, mRNA and protein levels of S1PR3, but not S1PR1, were also facilitated after CLP. However, PN + FO dramatically decreased SphK1 mRNA level and its enzymatic activity. S1PR3 expression was also attenuated by FO addition. In conclusion, the anti-inflammatory effect of n-3 PUFA may be linked to the inhibition of the SphK1/S1P pathway in a rat model of parenteral nutrition and CLP-induced sepsis.
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Abbreviations
- SphK1:
-
Sphingosine kinase 1
- S1P:
-
Sphingosine-1-phosphate
- n-3 PUFA:
-
n-3 polyunsaturated fatty acids
- EPA:
-
Eicosapentaenoic acid
- DHA:
-
Docosahexaenoic acid
- CLP:
-
Cecal ligation and puncture
- HMGB-1:
-
High-mobility group box 1
- S1PRs:
-
Sphingosine-1-phosphate receptors
- Sph:
-
Sphingosine
- TPN:
-
Total parenteral nutrition
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Acknowledgments
This study was supported by the Medical Science and Technology Innovation Subject of Nanjing Military Region (No. 12Z27).
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Tian, T., Zhao, Y., Huang, Q. et al. n-3 Polyunsaturated Fatty Acids Improve Inflammation via Inhibiting Sphingosine Kinase 1 in a Rat Model of Parenteral Nutrition and CLP-Induced Sepsis. Lipids 51, 271–278 (2016). https://doi.org/10.1007/s11745-016-4129-x
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DOI: https://doi.org/10.1007/s11745-016-4129-x