Presenilin-dependent γ-secretase activity mediates the intramembranous cleavage of CD44

CD44 is the major adhesion molecule for the extracellular matrix components and is implicated in a wide variety of physiological and pathological processes including the regulation of tumor cell growth and metastasis. Our previous studies have shown that CD44 undergoes sequential proteolytic cleavag...

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Veröffentlicht in:Oncogene 2003-03, Vol.22 (10), p.1511-1516
Hauptverfasser: Murakami, Daizo, Okamoto, Isamu, Nagano, Osamu, Kawano, Yoshiaki, Tomita, Taisuke, Iwatsubo, Takeshi, De Strooper, Bart, Yumoto, Eiji, Saya, Hideyuki
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container_end_page 1516
container_issue 10
container_start_page 1511
container_title Oncogene
container_volume 22
creator Murakami, Daizo
Okamoto, Isamu
Nagano, Osamu
Kawano, Yoshiaki
Tomita, Taisuke
Iwatsubo, Takeshi
De Strooper, Bart
Yumoto, Eiji
Saya, Hideyuki
description CD44 is the major adhesion molecule for the extracellular matrix components and is implicated in a wide variety of physiological and pathological processes including the regulation of tumor cell growth and metastasis. Our previous studies have shown that CD44 undergoes sequential proteolytic cleavages in the extracellular and transmembrane domains and the cleavage product derived from CD44 intramembranous cleavage acts as a signal transduction molecule. However, the underlying mechanism of the intramembranous cleavage of CD44 remains to be elucidated. In the present study, we report for the first time that CD44 is a substrate of the presenilin (PS)-dependent γ -secretase. We demonstrate that the intramembranous cleavage of CD44 induced by 12- O -tetradecanoylphorbol 13-acetate (TPA) treatment or mechanical scraping is blocked by γ -secretase inhibitors in U251MG cells and that this cleavage is also inhibited in PS-deficient mouse embryonic fibroblasts. Furthermore, we showed that PS1 is redistributed to ruffling areas of the plasma membrane similarly to CD44 after TPA treatment, supporting our biochemical observation that PS1 is involved in the intramembranous cleavage of CD44. Our present findings suggest important implications for understanding CD44-dependent signal transduction and a potential role of PS/ γ -secretase activity in the functional regulation of adhesion molecules.
doi_str_mv 10.1038/sj.onc.1206298
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subjects Acetic acid
Amyloid Precursor Protein Secretases
Animals
Apoptosis
Aspartic Acid Endopeptidases
Biological and medical sciences
Carbamates - pharmacology
CD44 antigen
Cell adhesion molecules
Cell Biology
Cell Membrane - metabolism
Cellular signal transduction
Central Nervous System Neoplasms - drug therapy
Central Nervous System Neoplasms - metabolism
Dipeptides - pharmacology
Embryo fibroblasts
Embryo, Mammalian - cytology
Endopeptidases - drug effects
Endopeptidases - metabolism
Extracellular matrix
Fibroblasts - drug effects
Fundamental and applied biological sciences. Psychology
Glioma - drug therapy
Glioma - metabolism
Human Genetics
Humans
Hyaluronan Receptors - drug effects
Hyaluronan Receptors - metabolism
Internal Medicine
Leupeptins - pharmacology
Medicine
Medicine & Public Health
Membrane proteins
Membrane Proteins - genetics
Membrane Proteins - metabolism
Metastases
Mice
Mice, Knockout
Molecular and cellular biology
Oncology
original-paper
Pepstatins - pharmacology
Physiological aspects
Presenilin
Presenilin 1
Protease Inhibitors - pharmacology
Proteolysis
Secretase
Signal Transduction
Tetradecanoylphorbol Acetate - pharmacology
Transmembrane domains
Tumor Cells, Cultured
Tumors
title Presenilin-dependent γ-secretase activity mediates the intramembranous cleavage of CD44
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