Abstract:
:In some v-Ha-ras-transfected cell lines, serum deprivation results in apoptosis. Clarification of the molecular mechanisms by which oncogenic Ras controls susceptibility to apoptosis may assist in the development of effective therapies against human cancer with oncogenic ras gene. In this report, we established a v-Ha-ras-transfected human fibroblast clone, R1. In R1 cells, induction of v-Ha-Ras enhanced susceptibility to cell death under serum-deprived conditions. Ladders of cellular DNA were identified only when oncogenic ras was induced under serum-deprived conditions. Platelet-derived growth factor (PDGF) precluded DNA fragmentation of serum-deprived v-Ha-ras-transformed cells. Under serum-depleted conditions, the amounts of activated ERK and Akt decreased as compared with those under serum-containing conditions. The decreased levels of activated ERK and Akt were restored by the addition of PDGF. Inhibition of phosphorylated-ERK and Akt resulted in renewed susceptibility to cell death. These results indicate that failure of signal transduction of oncogenic Ras by the deficiency of growth factors such as PDGF causes v-Ha-Ras-dependent apoptosis.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Arase Y,Hiwasa T,Hasegawa R,Nomura J,Ito H,Suzuki Ndoi
10.1006/bbrc.1999.1857subject
Has Abstractpub_date
2000-01-07 00:00:00pages
33-9issue
1eissn
0006-291Xissn
1090-2104pii
S0006-291X(99)91857-0journal_volume
267pub_type
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