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- W2043289628 abstract "Since ethacrynic acid (EA), an SH modifier as well as glutathione S-transferase (GST) inhibitor, has been suggested to induce apoptosis in some cell lines, its effects on a human colon cancer cell line DLD-1 were examined. EA enhanced cell proliferation at 20-40 microM, while it caused cell death at 60-100 microM. Caspase inhibitors did not block cell death and DNA ladder formation was not detected. Poly(ADP-ribose) polymerase, however, was cleaved into an 82-kDa fragment, different from an 85-kDa fragment that is specific for apoptosisis. The 82-kDa fragment was not recognized by antibody against PARP fragment cleaved by caspase 3. N-Acetyl-L-cysteine (NAC) completely inhibited EA-induced cell death, but 3(2)-t-butyl-4-hydroxyanisole or pyrrolidinedithiocarbamate ammonium salt did not. Glutathione (GSH) levels were dose-dependently increased in cells treated with EA and this increase was hardly affected by NAC addition. Mitogen-activated protein kinase (MAPK) kinase (MEK) 1, extracellular signal-regulated kinase (ERK) 1 and GST P1-1 were increased in cells treated with 25-75 microM EA, while c-Jun N-terminal kinase (JNK) 1 and p38 MAPK were markedly decreased by 100 microM EA. NAC repressed EA-induced alterations in these MAPKs and GST P1-1. p38 MAPK inhibitors, SB203580 and FR167653, dose-dependently enhanced EA-induced cell death. An MEK inhibitor, U0126, did not affect EA-induced cell death. These studies revealed that EA induced cell death concomitantly with a novel PARP fragmentation, but without DNA fragmentation. p38 MAPK was suggested to play an inhibitory role in EA-induced cell death." @default.
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- W2043289628 date "2003-10-01" @default.
- W2043289628 modified "2023-10-15" @default.
- W2043289628 title "Characterization of cell death induced by ethacrynic acid in a human colon cancer cell line DLD‐1 and suppression by <i>N</i>‐acetyl‐<scp>l</scp>‐cysteine" @default.
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- W2043289628 doi "https://doi.org/10.1111/j.1349-7006.2003.tb01371.x" @default.
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