A potent sphingomyelinase inhibitor from Cordyceps mycelia contributes its cytoprotective effect against oxidative stress in macrophages

Shwu Huey Wang, Wen Bin Yang, Yin Chen Liu, Yi Hua Chiu, Chien Tsu Chen, Pai Feng Kao, Chun Mao Lin

研究成果: 雜誌貢獻文章

25 引文 斯高帕斯(Scopus)

摘要

A novel water-soluble polysaccharide fraction, CME-1, with a molecular mass of 27.6 kDa and containing mannose and galactose in a respective ratio of 4:6, was prepared from Cordyceps sinensis mycelia and identified by NMR and GC-MS. In the current study, we examined whether CME-1 has anti-inflammatory effects in RAW264.7 cells. The ability of CME-1 to inhibit H2O 2-induced cell death in RAW264.7 cells was assessed by using an MTT assay and annexin V/propidium iodide double staining; we found that CME-1 protected cells against H2O2-induced injury. H 2O2-induced intracellular oxidative stress and mitochondrial membrane depolarization were also diminished with CME-1 treatment. We evaluated the hydroxyl radical scavenging ability of CME-1 by using the DMPO-electron spin resonance technique, which indicated that CME-1 acts as an intracellular antioxidant in a concentration-dependent manner through a mechanism other than its scavenging activity. Activities of both neutral and acid sphingomyelinases (SMases) were assessed in vitro, and results showed that the CME-1 inhibited activities of both neutral and acid SMases in a concentration-dependent manner. CME-1 reduced H2O2 treatment-elevated C16- and C18-ceramide levels measured by LC/MS/MS in RAW264.7 cells. Results suggest that CME-1 protects RAW264.7 cells against oxidative stress through inhibition of SMase activity and reduction of C16-and C18-ceramide levels.

原文英語
頁(從 - 到)471-479
頁數9
期刊Journal of Lipid Research
52
發行號3
DOIs
出版狀態已發佈 - 三月 2011

ASJC Scopus subject areas

  • Biochemistry
  • Cell Biology
  • Endocrinology

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