Abstract:
:Thyroid cells transformed by the Kirsten-ras oncogene become tumorigenic in syngeneic animals. Their growth is no longer dependent on TSH but becomes dependent on serum. Combining morphological and biochemical evidence, we show that serum withdrawal induces apoptotic cell death in Kirsten and Harvey-ras transformed thyroid cell. On the other hand, neither serum nor TSH withdrawal induce apoptosis in differentiated FRTL-5 cells. The induction of apoptosis by serum withdrawal is rapid and not triggered at a specific phase of the cell cycle. We suggest that induction of apoptosis following growth factor deprivation is an additional important characteristic, besides TSH-independence for growth and dedifferentiation, of the thyroid transformed phenotype.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
di Jeso B,Ulianich L,Racioppi L,D'Armiento F,Feliciello A,Pacifico F,Consiglio E,Formisano Sdoi
10.1006/bbrc.1995.2360subject
Has Abstractpub_date
1995-09-25 00:00:00pages
819-24issue
3eissn
0006-291Xissn
1090-2104pii
S0006291X85723601journal_volume
214pub_type
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