Abstract:
:The anti-tumor effects of actinomycin D (Act D) and recombinant human tumor necrosis factor (TNF)-alpha have been studied on 4 established murine tumor cell lines: MmB16 melanoma, Lewis lung (LL/2) carcinoma, L1 sarcoma and L1210 leukemia. During short-term incubation (24 hr) Act D produced dose-dependent cytostatic/cytotoxic effects against MmB16, LL/2 and L1 tumor cells but did not reduce the viability of these cells even at high concentration (10 micrograms/ml), below a threshold of 30-60%. However, L1210 leukemic cells were highly susceptible to Act D, and no viable cells were detected in cultures incubated with 1 microgram/ml of Act D. TNF-alpha alone, when used under the same culture conditions, had only a negligible effect on all cell lines tested. However, the combination of this cytokine with Act D produced synergistic cytotoxic effects against MmB16, LL/2 and L1 cells but not against L1210 leukemia cells. In an in vivo model of regional therapy in which tumor-bearing mice were treated with Act D and TNF-alpha, a correlation with in vitro results was observed. In mice bearing MmB16 melanoma, LL/2 carcinoma and L1 sarcoma, the most potent anti-tumor effects were observed in mice treated with Act D and TNF-alpha together. This treatment led to a delay of tumor growth and induced complete tumor regression in some cases. On the contrary, TNF-alpha did not enhance the effect of Act D in mice injected with L1210 leukemia cells. Our results show that TNF-alpha can potentiate the anti-tumor effects of Act D against tumors weakly susceptible to Act D and may be a useful adjuvant to chemotherapy in the local treatment of neoplasia.
journal_name
Int J Cancerjournal_title
International journal of cancerauthors
Lasek W,Giermasz A,Kuc K,Wańkowicz A,Feleszko W,Gołab J,Zagozdzon R,Stokłosa T,Jakóbisiak Mdoi
10.1002/(SICI)1097-0215(19960503)66:3<374::AID-IJCsubject
Has Abstractpub_date
1996-05-03 00:00:00pages
374-9issue
3eissn
0020-7136issn
1097-0215pii
10.1002/(SICI)1097-0215(19960503)66:3<374::AID-IJCjournal_volume
66pub_type
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