Induction of matrix metalloproteinase-9 requires a polymerized actin cytoskeleton in human malignant glioma cells

Shravan K. Chintala, Raymond Sawaya, Bharat B. Aggarwal, Sadhan Majumder, Dipak K. Giri, Athanassios P. Kyritsis, Ziya L. Gokaslan, Jasti S. Rao

Research output: Contribution to journalArticlepeer-review

Abstract

Alterations in cytoskeleton and subsequent cell shape changes exert specific effects on the expression of various genes. Our previous results suggested that malignant human gliomas express elevated levels of matrix metalloproteinase compared with normal brain tissue and low grade gliomas. To understand the role of cell shape changes on matrix metalloproteinase expression in human glioma cells, we treated SNB19 cells with cytochalasin- D, an inhibitor of actin polymerization, and colchicine-B, a tubulin inhibitor, in the presence of phorbol 12-myristate 13-acetate. Cytochalasin- D treatment of SNB19 cells resulted in the loss of phorbol 12-myristate 13- acetate-induced matrix metalloproteinase-9 (also known as gelatinase-B) expression and coincided with inhibition of actin polymerization, resulting in cell rounding. Moreover, compared with monolayers, cells grown as spheroids or cell aggregates failed to express matrix metalloproteinase-9 in the presence of phorbol 12-myristate 13-acetate. Matrix metalloproteinase-9 expression was also inhibited by calphostin-C, a protein kinase inhibitor, suggesting the involvement of protein kinase C in matrix metalloproteinase-9 expression. Phorbol 12-myristate 13-acetate-induced invasion of SNB19 cells through Matrigel was inhibited by cytochalasin-D and calphostin-C. These results suggest that the actin polymerization transduces signals that modulate the expression of matrix metalloproteinase-9 expression and the subsequent invasion of human glioma cells.

Original languageEnglish (US)
Pages (from-to)13545-13551
Number of pages7
JournalJournal of Biological Chemistry
Volume273
Issue number22
DOIs
StatePublished - May 29 1998

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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