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  • MMP-7 cleaves the NR1 NMDA receptor subunit and modifies NMDA receptor function.

MMP-7 cleaves the NR1 NMDA receptor subunit and modifies NMDA receptor function.

FASEB journal : official publication of the Federation of American Societies for Experimental Biology (2008-07-23)
Arek Szklarczyk, Osefame Ewaleifoh, Jean-Claude Beique, Yue Wang, David Knorr, Norman Haughey, Tanya Malpica, Mark P Mattson, Richard Huganir, Katherine Conant
초록

Matrix metalloproteinases (MMPs) are zinc-dependent enzymes that play a role in the inflammatory response. These enzymes have been well studied in the context of cancer biology and inflammation. Recent studies, however, suggest that these enzymes also play roles in brain development and neurodegenerative disease. Select MMPs can target proteins critical to synaptic structure and neuronal survival, including integrins and cadherins. Here, we show that one member of the MMP family, MMP-7, which may be released from cells, including microglia, can target a protein critical to synaptic function. Through analysis of extracts from murine cortical slice preparations, we show that MMP-7 cleaves the NR1 subunit of the N-methyl-d-aspartate (NMDA) receptor to generate an N-terminal fragment of approximately 65 kDa. Moreover, studies with recombinant protein show that MMP-7-mediated cleavage of NR1 occurs at amino acid 517, which is extracellular and just distal to the first transmembrane domain. Data suggest that NR2A, which shares sequence homology with NR1, is also cleaved following treatment of slices with MMP-7, while select AMPA receptor subunits are not. Consistent with a potential effect of MMP-7 on ligand binding, additional experiments demonstrate that NMDA-mediated calcium flux is significantly diminished by MMP-7 pretreatment of cultures. In addition, the AMPA/NMDA ratio is increased by MMP-7 pretreatment. These data suggest that synaptic function may be altered in neurological conditions associated with increased levels of MMP-7.

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Sigma-Aldrich
Anti-NMDAR2A Antibody, Chemicon®, from mouse
Sigma-Aldrich
MMP-9, Active, Human, Recombinant