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J Biol Chem, Vol. 274, Issue 2, 801-813, January 8, 1999

Role of Mitogen-activated Protein Kinases and c-Jun/AP-1 trans-Activating Activity in the Regulation of Protease mRNAs and the Malignant Phenotype in NIH 3T3 Fibroblasts

Mark JanulisDagger , Simone Silberman, Anar AmbegaokarDagger , J. Silvio Gutkindparallel , and Richard M. SchultzDagger

From the Dagger  Department of Molecular and Cellular Biochemistry and the  Department of Pathology, Stritch School of Medicine, Loyola University Chicago, Maywood, Illinois 60153 and the parallel  Molecular Signaling Unit, Laboratory of Cellular Development and Oncology, NIDR, National Institutes of Health, Bethesda, Maryland 20892

Ras activates a multitude of downstream activities with roles in cellular proliferation, invasion and metastasis, differentiation, and programmed cell death. In this work we have evaluated the requirement of extracellular signal-regulated protein kinase (ERK), c-Jun NH2-terminal kinase kinase (JNKK), and c-Jun/AP-1 activities in transformation and extracellular matrix invasion of ras oncogene expressing NIH 3T3 fibroblasts by expressing stable mutant genes that constitutively inhibit these activities. Whereas the inhibition of ERK activity reverts the transformed and invasive phenotype, the inhibition of the JNK pathway and AP-1 trans-activating activities by JNKK[K129R] and c-Jun(TAM67) had no effect on the ability of the ras oncogene-expressing cells to grow in soft agar or invade Matrigel basement membrane. Thus an elevated JNK activity and/or c-Jun/AP-1 trans-activating activity are not absolute requirements for ras transformation or invasion through basement membrane, and the dependence on AP-1 activity for transformation is cell-specific. However, inhibition of JNK kinase (JNKK) in ras-transformed cells with normally elevated JNK activity switches the protease-dependent invasive phenotype from a urokinase plasminogen activator (uPA)-dependent to a cathepsin L (CL)-dependent invasive phenotype. Conversely, treatment of ras-transformed cells of low constitutive JNK activity with the JNK stimulator, anisomycin, converts the protease mRNA levels from those characteristic of a CL-dependent to a uPA-dependent phenotype. These protease phenotypes can be duplicated in untransformed NIH 3T3 cells that express platelet-derived growth factor receptors and m1 muscarinic receptors that selectively stimulate the ERK or JNK pathways, respectively. It is concluded that high ERK activity is required for both protease phenotypes, whereas the JNK pathway and c-Jun/AP-1 activity are not required for transformation but regulate a switch between uPA and CL protease phenotypes in both transformed and untransformed cells. In ras-transformed NIH 3T3 fibroblasts, the uPA- and CL-dependent protease phenotypes are redundant in their ability to invade through basement membrane.

Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.


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