Neutral/alkaline and acid ceramidase activities are actively released by murine endothelial cells

Elena Romiti, Elisabetta Meacci, Motohiro Tani, Francesca Nuti, Marta Farnararo, Makoto Ito, Paola Bruni

研究成果: ジャーナルへの寄稿学術誌査読

46 被引用数 (Scopus)


Ceramidases (CDase(s)) play a key role in sphingolipid metabolism by hydrolyzing ceramide into sphingosine. Here we report that murine endothelial cells, macrophages, and human fibroblasts are all able to release acid as well as neutral/alkaline CDase activities in the culture medium. Endothelial cells were characterized by the highest specific activity of cellular as well as secreted CDases. The release of both enzymatic activities was reduced by protein synthesis inhibitor cycloheximide but was unaffected by the blocking of RNA transcription with actinomycin D. The discharge of acid and neutral/alkaline CDases was also diminished by brefeldin A, a fungal metabolite which disrupts Golgi apparatus. Remarkably, treatment of endothelial cells with bradykinin resulted in a significant increase of neutral/alkaline but not acid CDase release. This report represents the first evidence for the existence of constitutive and regulated release of CDase activities by endothelial cells. In view of the known ability of these cells to secrete sphingomyelinase, this finding suggests that CDase may participate in extracellular sphingomyelin metabolism which is presently known to have a role in atherogenesis and could be involved in other physiological or pathological events. (C) 2000 Academic Press.

ジャーナルBiochemical and Biophysical Research Communications
出版ステータス出版済み - 9月 7 2000

!!!All Science Journal Classification (ASJC) codes

  • 生物理学
  • 生化学
  • 分子生物学
  • 細胞生物学


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