Evidence
Sci Adv. 2023 Jul 21;9(29):eadg0686. doi: 10.1126/sciadv.adg0686. Epub 2023 Jul 19.
ABSTRACT
The gelatinases, matrix metalloproteinase 2 (MMP-2) and MMP-9, are key for leukocyte penetration of the brain parenchymal border in neuroinflammation and the functional integrity of this barrier; however, it is unclear which MMP substrates are involved. Using a tailored, sensitive, label-free mass spectrometry-based secretome approach, not previously applied to nonimmune cells, we identified 119 MMP-9 and 21 MMP-2 potential substrates at the cell surface of primary astrocytes, including known substrates (β-dystroglycan) and a broad spectrum of previously unknown MMP-dependent events involved in cell-cell and cell-matrix interactions. Using neuroinflammation as a model of assessing compromised astroglial barrier function, a selection of the potential MMP substrates were confirmed in vivo and verified in human samples, including vascular cell adhesion molecule-1 and neuronal cell adhesion molecule. We provide a unique resource of potential MMP-2/MMP-9 substrates specific for the astroglia barrier. Our data support a role for the gelatinases in the formation and maintenance of this barrier but also in astrocyte-neuron interactions.
PMID:37467333 | DOI:10.1126/sciadv.adg0686
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Secretomics reveals gelatinase substrates at the blood-brain barrier that are implicated in astroglial barrier function
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Secretomics reveals gelatinase substrates at the blood-brain barrier that are implicated in astroglial barrier function
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