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Membrane microvesicle shedding is an active process and occurs in viable cells with no signs of apoptosis or necrosis. We report here that microvesicles shed by oligodendroglioma cells contain an 'aggrecanase' activity, cleaving aggrecan at sites previously identified as targets for adamalysin metalloproteinases with disintegrin and thrombospondin domains (ADAMTSs). Degradation was inhibited by EDTA, the metalloproteinase inhibitor GM6001 and by tissue inhibitor of metalloproteinases (TIMP)-3, but not by TIMP-1 or TIMP-2. This inhibitor profile indicates that the shed microvesicles contain aggrecanolytic ADAMTS(s) or related TIMP-3-sensitive metalloproteinase(s). The oligodendroglioma cells were shown to express the three most active aggrecanases, namely . Adamts1, . Adamts4 and . Adamts5, suggesting that one or more of these enzymes may be responsible for the microvesicle activity. Microvesicles shed by rheumatoid synovial fibroblasts similarly degraded aggrecan in a TIMP-3-sensitive manner. Our findings raise the novel possibility that microvesicles may assist oligodendroglioma and rheumatoid synovial fibroblasts to invade through aggrecan-rich extracellular matrices. © 2012 International Society of Matrix Biology.

Original publication

DOI

10.1016/j.matbio.2012.02.005

Type

Journal article

Journal

Matrix Biology

Publication Date

01/05/2012

Volume

31

Pages

229 - 233