Pravastatin Attenuates Ceramide‐Induced Cytotoxicity in Mouse Cerebral Endothelial Cells with HIF‐1 Activation and VEGF Upregulation

SDER CHEN, CJ HU, DI YANG… - Annals of the New …, 2005 - Wiley Online Library
SDER CHEN, CJ HU, DI YANG, A Nassief, H Chen, K Yin, J Xu, CY Hsu
Annals of the New York Academy of Sciences, 2005Wiley Online Library
Ceramide is a pro‐apoptotic lipid messenger that induces oxidative stress and may mediate
apoptosis in cerebral endothelial cells (CECs) induced by TNF‐α/cycloheximide,
lipopolysaccharide, oxidized LDL, IL‐1, and amyloid peptide. Exposure of CECs to C2
ceramide for 12 h caused cell death in a concentration‐dependent manner, with a LC50 of
30 μM. Statins are inhibitors of 3‐hydroxyl‐3‐methyl coenzyme A reductase which is the rate‐
limiting enzyme for cholesterol biosynthesis. Pretreatment with pravastatin at 20 μM for 16 h …
Abstract: Ceramide is a pro‐apoptotic lipid messenger that induces oxidative stress and may mediate apoptosis in cerebral endothelial cells (CECs) induced by TNF‐α/cycloheximide, lipopolysaccharide, oxidized LDL, IL‐1, and amyloid peptide. Exposure of CECs to C2 ceramide for 12 h caused cell death in a concentration‐dependent manner, with a LC50 of 30 μM. Statins are inhibitors of 3‐hydroxyl‐3‐methyl coenzyme A reductase which is the rate‐limiting enzyme for cholesterol biosynthesis. Pretreatment with pravastatin at 20 μM for 16 h substantially attenuated ceramide cytotoxicity in mouse CECs. Increases in vascular endothelial growth factor (VEGF) expression were detected within 1‐3 h after pravastatin treatment. This pravastatin action was accompanied by the activation of hypoxia‐inducible factor‐1 (HIF‐1), a transcription factor known to activate VEGF expression. These results raise the possibility that pravastatin may protect CECs against ceramide‐induced death via the HIF‐VEGF cascade.
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