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MT5-MMP controls APP and β-CTF/C99 metabolism through proteolytic-dependent and -independent mechanisms relevant for Alzheimer’s disease

Abstract : We previously discovered the implication of membrane-type 5-matrix metalloproteinase (MT5-MMP) in Alzheimer’s disease AD pathogenesis. Here we shed new light on pathogenic mechanisms by which MT5-MMP controls APP processing and the fate of amyloid beta peptide (Aβ), its precursor C99 and C83. We found in HEK carrying the APP Swedish familial mutation (HEKswe) that MT5-MMP-mediated processing of APP that releases the soluble 95 kDa form (sAPP95), was hampered by the removal of the C-terminal non-catalytic domains of MT5-MMP. Catalytically inactive MT5-MMP variants increased the levels of Aβ and promoted APP/C99 sorting in the endo-lysosomal system. We found interaction of C99 with the C-terminal portion of MT5-MMP, the deletion of which caused a strong degradation of C99 by the proteasome, preventing Aβ accumulation. These findings reveal novel mechanisms for MT5-MMP control of APP metabolism and C99 fate involving proteolytic and non-proteolytic actions mainly mediated by the C-terminal part of the proteinase.
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Preprints, Working Papers, ...
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https://hal.archives-ouvertes.fr/hal-03064994
Contributor : Santiago Rivera <>
Submitted on : Monday, December 14, 2020 - 4:24:03 PM
Last modification on : Thursday, February 11, 2021 - 11:26:02 AM

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Laura García-González, Jean-Michel Paumier, Laurence Louis, Dominika Pilat, Anne Bernard, et al.. MT5-MMP controls APP and β-CTF/C99 metabolism through proteolytic-dependent and -independent mechanisms relevant for Alzheimer’s disease. 2020. ⟨hal-03064994⟩

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