Differential induction of c-Jun NH2-terminal kinase and c-Abl kinase in DNA mismatch repair-proficient and -deficient cells exposed to cisplatin.
The c-Abl nonreceptor tyrosine kinase and the c-Jun NH2-terminal kinase (JNK/stress-activated protein kinase) are activated during the injury response to the DNA-damaging agent cisplatin. Loss of DNA mismatch repair activity results in resistance to cisplatin in human cancer cells, suggesting that the mismatch repair proteins function as a detector for cisplatin DNA adducts. To identify signaling pathways activated by this detector, we investigated the effect of the loss of DNA mismatch repair function on the ability of cisplatin to activate the JNK and c-Abl kinases. The results demonstrate that cisplatin activates JNK kinase 3.8 +/- 0.2-fold more efficiently in DNA mismatch repair-proficient than repair-deficient cells, and that activation of c-Abl is completely absent in the DNA mismatch repair-deficient cells. Furthermore, the results show that cisplatin-induced activation of JNK occurs through a stress-activated protein kinase/extracellular signal-regulated kinase kinase 1-independent mechanism. We conclude that activation of JNK and c-Abl by cisplatin is in part dependent upon the integrity of DNA mismatch repair function, suggesting that these kinases are part of the signal transduction pathway activated when mismatch repair proteins recognize cisplatin adducts in DNA.
Nehmé
A
A
Department of Medicine and the Cancer Center, University of California, San Diego, La Jolla 92093-0058, USA.
Baskaran
R
R
Aebi
S
S
Fink
D
D
Nebel
S
S
Cenni
B
B
Wang
J Y
JY
Howell
S B
SB
Christen
R D
RD
D000230:Adenocarcinoma / Q000378:metabolism; D017209:Apoptosis; D017871:Calcium-Calmodulin-Dependent Protein Kinases / Q000378:metabolism*; D002945:Cisplatin / Q000494:pharmacology*; D015179:Colorectal Neoplasms / Q000378:metabolism; D018736:DNA Adducts; D004260:DNA Repair; D004351:Drug Resistance / Q000235:genetics; D004790:Enzyme Induction; D006801:Humans; D048031:JNK Mitogen-Activated Protein Kinases; D020928:Mitogen-Activated Protein Kinases; D010940:Plant Proteins; D017346:Protein Serine-Threonine Kinases / Q000378:metabolism; D016315:Proto-Oncogene Proteins c-abl / Q000378:metabolism*; D014407:Tumor Cells, Cultured; D054462:p21-Activated Kinases
D018736:DNA Adducts; D010940:Plant Proteins; D016315:Proto-Oncogene Proteins c-abl; D017346:Protein Serine-Threonine Kinases; D054462:p21-Activated Kinases; D017871:Calcium-Calmodulin-Dependent Protein Kinases; D048031:JNK Mitogen-Activated Protein Kinases; C101691:MMK4 protein, Medicago sativa; D020928:Mitogen-Activated Protein Kinases; D002945:Cisplatin