title: Metalloproteinase- and gamma-secretase-mediated cleavage of protein-tyrosine phosphatase receptor type Z.
abstract: Protein-tyrosine phosphatase receptor type Z (Ptprz) is preferentially expressed in the brain as a major chondroitin sulfate proteoglycan. Three splicing variants, two receptor isoforms and one secretory isoform, are known. Here, we show that the extracellular region of the receptor isoforms of Ptprz are cleaved by metalloproteinases, and subsequently the membrane-tethered fragment is cleaved by presenilin/gamma-secretase, releasing its intracellular region into the cytoplasm; of note, the intracellular fragment of Ptprz shows nuclear localization. Administration of GM6001, an inhibitor of metalloproteinases, to mice demonstrated the metalloproteinase-mediated cleavage of Ptprz under physiological conditions. Furthermore, we identified the cleavage sites in the extracellular juxtamembrane region of Ptprz by tumor necrosis factor-alpha converting enzyme and matrix metalloproteinase 9. This is the first evidence of the metalloproteinase-mediated processing of a receptor-like protein-tyrosine phosphatase in the central nervous system.
authors: National Institute for Basic Biology and School of Life Science, The Graduate University for Advanced Studies, Okazaki, Aichi 444-8787, Japan.
authors: Jeremy Pak Hong
authors: JP
authors: Chow
authors: Akihiro
authors: A
authors: Fujikawa
authors: Hidetada
authors: H
authors: Shimizu
authors: Ryoko
authors: R
authors: Suzuki
authors: Masaharu
authors: M
authors: Noda
mesh_terms: D051722:ADAM Proteins / Q000235:genetics / Q000378:metabolism*; D000072198:ADAM17 Protein; D021581:Active Transport, Cell Nucleus / Q000502:physiology; D053829:Amyloid Precursor Protein Secretases / Q000235:genetics / Q000378:metabolism*; D000818:Animals; D001921:Brain / Q000201:enzymology*; D016466:CHO Cells; D002467:Cell Nucleus / Q000201:enzymology / Q000235:genetics; D011508:Chondroitin Sulfate Proteoglycans / Q000235:genetics / Q000378:metabolism*; D006224:Cricetinae; D003412:Cricetulus; D004151:Dipeptides / Q000494:pharmacology; D006801:Humans; D007527:Isoenzymes / Q000235:genetics / Q000378:metabolism*; D020780:Matrix Metalloproteinase 9 / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D009419:Nerve Tissue Proteins / Q000235:genetics / Q000378:metabolism*; D053763:Presenilins / Q000235:genetics / Q000378:metabolism; D011480:Protease Inhibitors / Q000494:pharmacology; D017434:Protein Structure, Tertiary / Q000502:physiology; D051381:Rats; D054633:Receptor-Like Protein Tyrosine Phosphatases, Class 5 / Q000235:genetics / Q000378:metabolism*
chemical_list: D011508:Chondroitin Sulfate Proteoglycans; D004151:Dipeptides; D007527:Isoenzymes; C078131:N-(2(R)-2-(hydroxamidocarbonylmethyl)-4-methylpentanoyl)-L-tryptophan methylamide; D009419:Nerve Tissue Proteins; D053763:Presenilins; D011480:Protease Inhibitors; D054633:Receptor-Like Protein Tyrosine Phosphatases, Class 5; D053829:Amyloid Precursor Protein Secretases; D051722:ADAM Proteins; D020780:Matrix Metalloproteinase 9; D000072198:ADAM17 Protein