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• W2060700279 endingPage "G973" @default.
• W2060700279 startingPage "G967" @default.
• W2060700279 abstract "Sphingomyelin (SM) hydrolysis in the gut has implications in colonic tumorigenesis and cholesterol absorption. It is triggered by intestinal alkaline sphingomyelinase (Alk-SMase) that is present in the intestinal mucosa and content. The mechanism by which the enzyme is released into the lumen is not clear. We studied whether trypsin can dissociate Alk-SMase from the mucosa and affect its activity. During luminal perfusion of rat intestine, addition of trypsin to the buffer increased Alk-SMase activity in the perfusate output by about threefold. Treating COS-7 cells transfected with Alk-SMase cDNA with trypsin increased the SMase activity in the medium and reduced that in the cell lysate dose dependently. The appearance of Alk-SMase in the perfusate and culture medium was confirmed by Western blot analysis. The effect of trypsin was blocked by trypsin inhibitor, and neither chymotrypsin nor elastase had a similar effect. We also expressed the full length and COOH-terminal truncated Alk-SMase in COS-7 cells and found that the activity of the full-length enzyme is mainly in the cells, whereas that of the truncated form is mainly in the medium. Both forms were active, but only the activity of the full-length Alk-SMase was enhanced by trypsin. By linking a poly-His tag to the constructed cDNA, we found that the first tryptic site Arg440 upstream of the signal anchor was attacked by trypsin. In conclusion, trypsin cleaves the Alk-SMase at the COOH terminal, releases it from mucosa, and meanwhile enhances its activity. The findings indicate a physiological role of trypsin in SM digestion." @default.
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• W2060700279 date "2004-11-01" @default.
• W2060700279 modified "2023-10-16" @default.
• W2060700279 title "Pancreatic trypsin cleaves intestinal alkaline sphingomyelinase from mucosa and enhances the sphingomyelinase activity" @default.
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• W2060700279 doi "https://doi.org/10.1152/ajpgi.00190.2004" @default.
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