Abstract
We examined if lipopolysaccharide (LPS) treatment of mice affected cardiolipin (CL) synthesis. Mice were injected i.p. with LPS, the liver harvested, and CL synthase (CLS) enzyme activity and its mRNA expression examined. Treatment of mice with LPS resulted in a 55% decrease (p < 0.01) in mRNA expression of murine CLS compared to controls, but CLS enzyme activity was unaltered. The pool size of liver CL and other phospholipids were unaltered by LPS treatment. A similar effect was observed in murine epidermal fat pad and in vitro in RAW mouse macrophages and in human HepG2 cells. LPS treatment of HepG2 cells transiently expressing a histidine-tagged human cardiolipin synthase-1 (hCLS1) reduced hCLS1 mRNA and newly synthesized CLS activity indicating that LPS inhibits production of newly synthesized hCLS1 via reduction in hCLS1 mRNA. The results clearly indicate that CLS mRNA levels cannot be correlated with CLS enzyme activity nor CL content in the LPS model of inflammation.
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Abbreviations
- CL:
-
Cardiolipin
- LPS:
-
Lipopolysaccharide
- CLS:
-
Cardiolipin synthase
- hCLS1:
-
Human cardiolipin synthase-1
- mCLS1:
-
Murine cardiolipin synthase-1
- FBS:
-
Fetal bovine serum
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Acknowlegements
This work was supported by operating grants from the Heart and Stroke Foundation of Manitoba, the Canadian Institutes of Health Research, and the Manitoba Health Research Council (G.M.H.) and the National Institutes of Health (K.R.F.). G.M.H. is a Canada Research Chair in Molecular Cardiolipin Metabolism.
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Lu, B., Xu, F.Y., Taylor, W.A. et al. Cardiolipin Synthase-1 mRNA Expression Does Not Correlate with Endogenous Cardiolipin Synthase Enzyme Activity In Vitro and In Vivo in Mammalian Lipopolysaccharide Models of Inflammation. Inflammation 34, 247–254 (2011). https://doi.org/10.1007/s10753-010-9230-3
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DOI: https://doi.org/10.1007/s10753-010-9230-3