Purification and characterization of human intestinal neutral ceramidase.

Purification and characterization of human intestinal neutral ceramidase. Research Abstract Details 

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Purification and characterization of human intestinal neutral ceramidase. Abstract Text:

Lena Ohlsson,Carina Palmberg,Rui-Dong Duan,Maria Olsson,Tomas Bergman,Ake Nilsson,

Sphingolipids are degraded by sphingomyelinase and ceramidase in the gut to ceramide and sphingosine, which may inhibit cell proliferation and induce apoptosis, and thus have anti-tumour effects in the gut. Although previous rodent studies including experiments on knockout mice indicate a role of neutral ceramidase in ceramide digestion, the human enzyme has never been purified and characterized in its purified form. We here report the purification and characterization of neutral ceramidase from human ileostomy content, using octanoyl-[(14)C]sphingosine as substrate. After four chromatographic steps, a homogeneous protein band with 116kDa was obtained. MALDI mass spectrometry identified 16 peptide masses similar to human ceramidase previously cloned by El Bawab et al. [Molecular cloning and characterization of a human mitochondrial ceramidase, J. Biol. Chem. 275 (2000) 21508-21513] and Hwang et al. [Subcellular localization of human neutral ceramidase expressed in HEK293 cells, Biochem. Biophys. Res. Commun. 331 (2005) 37-42]. By RT-PCR and 5'-RACE methods, a predicted partial nucleotide sequence of neutral ceramidase was obtained from a human duodenum biopsy sample, which was homologous to that of known neutral/alkaline ceramidases. The enzyme has neutral pH optimum and catalyses both hydrolysis and formation of ceramide without distinct bile salt dependence. It is inhibited by Cu(2+) and Zn(2+) ions and by low concentrations of cholesterol. The enzyme is a glycoprotein but deglycosylation does not affect its activity. Our study indicates that neutral ceramidase is expressed in human intestine, released in the intestinal lumen and plays a major role in ceramide metabolism in the human gut.

Purification and characterization of human intestinal neutral ceramidase. Publishing Authors By Initials

L Ohlsson,C Palmberg,RD Duan,M Olsson,T Bergman,A Nilsson,

For similar cells: cells, cultured: tumor cells, cultured research abstracts see: cells: cells, cultured: tumor cells, cultured research

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Purification and characterization of human intestinal neutral ceramidase. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Biochimie

VOLUME: 89

Page Numbers: 950-60

Journal Abbreviation: Biochimie

ISSN: 0300-9084

DAY: 19

MONTH: 03

YEAR: 2007

Purification and characterization of human intestinal neutral ceramidase. Information

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LANGUAGE: eng

NlmUniqueID: 1264604

Purification and characterization of human intestinal neutral ceramidase. Keywords Mesh Terms:

KEYWORDS: Tumor Cells, Cultured

MESH TERMS: enzymology

Chemical & Substance for Abstract: Purification and characterization of human intestinal neutral ceramidase. Information

Substance Name: ceramidase

Registry Number: EC 3.5.1.23

Grant and Affiliation Information for Purification and characterization of human intestinal neutral ceramidase.

AFFILIATION: Gastroenterology and Nutrition Laboratory, Biomedical Centre B11, Lund University, Tornavagen 10, S-22184 Lund, Sweden. lena.ohlsson@med.lu.se

Country: France

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MEDLINETA: Biochimie

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