Most transmembrane proteins are subjected to limited proteolysis by cellular proteases, and stimulation of cleavage of membrane proteins by calmodulin (CaM) inhibitors was recently shown. The present study investigated the ability of several CaM inhibitors to induce the proteolytic cleavage of the membrane type-1 matrix metalloproteinase (MT1-MMP) from the cell surface of highly invasive U-87 glioblastoma cells. Although no shedding of a soluble MT1-MMP form was induced by CaM inhibitors in the conditioned media, we showed that these inhibitors induced MT1-MMP proteolytic processing to the 43kDa membrane-bound inactive form that was not correlated with an increase in proMMP-2 activation but rather with an increase in tissue inhibitor of MMPs (TIMP)-2 expression levels. Moreover, this proteolytic processing was sensitive to marimastat suggesting the involvement of MMPs. Interestingly, CaM inhibitors antagonized concanavalin A- and cytochalasin D-induced proMMP-2 activation, and affected the cytoskeletal actin organization resulting in the loss of migratory potential of U-87 glioblastoma cells. Cytoplasmic tail-truncated MT1-MMP constructs expressed in COS-7 cells were also affected by CaM inhibitors suggesting that these inhibitors stimulated MT1-MMP proteolytic processing by mechanisms independent of the CaM–substrate interaction. We also propose that TIMP-2 acts as a negative regulator of MT1-MMP-dependent activities promoted by the action of CaM inhibitors in U-87 glioblastoma cells.
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October 2001
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Research Article|
October 08 2001
Calmodulin inhibitors trigger the proteolytic processing of membrane type-1 matrix metalloproteinase, but not its shedding in glioblastoma cells
Borhane ANNABI
;
Borhane ANNABI
∗Centre de Cancérologie Charles-Bruneau, Hôpital Sainte-Justine, 3175 Côte Ste-Catherine, Montréal, Québec, Canada H3T 1C5
†Université du Québec à Montréal, C.P. 8888, Succ. Centre-ville, Montréal, Québec, Canada H3C 3P8
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Anthony PILORGET
;
Anthony PILORGET
∗Centre de Cancérologie Charles-Bruneau, Hôpital Sainte-Justine, 3175 Côte Ste-Catherine, Montréal, Québec, Canada H3T 1C5
†Université du Québec à Montréal, C.P. 8888, Succ. Centre-ville, Montréal, Québec, Canada H3C 3P8
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Nathalie BOUSQUET-GAGNON
;
Nathalie BOUSQUET-GAGNON
∗Centre de Cancérologie Charles-Bruneau, Hôpital Sainte-Justine, 3175 Côte Ste-Catherine, Montréal, Québec, Canada H3T 1C5
†Université du Québec à Montréal, C.P. 8888, Succ. Centre-ville, Montréal, Québec, Canada H3C 3P8
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Denis GINGRAS
;
Denis GINGRAS
∗Centre de Cancérologie Charles-Bruneau, Hôpital Sainte-Justine, 3175 Côte Ste-Catherine, Montréal, Québec, Canada H3T 1C5
†Université du Québec à Montréal, C.P. 8888, Succ. Centre-ville, Montréal, Québec, Canada H3C 3P8
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Richard BÉLIVEAU
Richard BÉLIVEAU
1
∗Centre de Cancérologie Charles-Bruneau, Hôpital Sainte-Justine, 3175 Côte Ste-Catherine, Montréal, Québec, Canada H3T 1C5
†Université du Québec à Montréal, C.P. 8888, Succ. Centre-ville, Montréal, Québec, Canada H3C 3P8
1To whom correspondence should be addressed at Laboratoire de Médecine Moléculaire, Université du Québec à Montréal C.P. 8888, Succ. Centre-ville, Montréal, Québec, Canada, H3C 3P8 (e-mail molmed@justine.umontreal.ca).
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Biochem J (2001) 359 (2): 325–333.
Article history
Received:
March 20 2001
Revision Received:
May 16 2001
Accepted:
August 08 2001
Citation
Borhane ANNABI, Anthony PILORGET, Nathalie BOUSQUET-GAGNON, Denis GINGRAS, Richard BÉLIVEAU; Calmodulin inhibitors trigger the proteolytic processing of membrane type-1 matrix metalloproteinase, but not its shedding in glioblastoma cells. Biochem J 15 October 2001; 359 (2): 325–333. doi: https://doi.org/10.1042/bj3590325
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