Abstract:
:Stage 4 neuroblastoma (NB) is a devastating childhood cancer whose poor outcome has remained essentially unchanged in the last 20 years. Receptor tyrosine kinases have important roles in the control of proliferation, differentiation and apoptosis of NB cells. Thus, we tested the activity of second-generation tyrosine kinase inhibitor Dasatinib in human NB cell lines in vitro and in an orthotopic mouse model. Dasatinib inhibited cell viability with an IC(50) in the submicromolar range in 7 of 10 tested cell lines. In sensitive cells, Dasatinib reduced anchorage-independent growth and, in some instances, induced senescence and apoptosis. In HTLA-230 cells, Dasatinib treatment caused down-regulation of c-Kit and c-Src phosphorylation in conjunction with strong inhibition of Erk1/2 and Akt activity. To test the efficacy of Dasatinib in vivo, HTLA-230 and SY5Y cells were orthotopically injected in the adrenal gland of nude mice and drug treatments carried out until day 40. In mice injected with HTLA-230 cells, tumour growth was significantly inhibited at the dose of 30 mg/(kg day) when treatment was started 7 days after injection. In animals injected with SY5Y cells that were exquisitely sensitive in vitro (IC(50)= 92 nM), the antitumour effect of Dasatinib was observed at the dose of 60 mg/(kg day) but only when treatment was started 1 day after injection. However, the anti-tumour effect of Dasatinib in vivo was partial in both orthotopic models, emphasizing the importance of testing candidate new drugs in animal environments closely mimicking the human tumour.
journal_name
Int J Cancerjournal_title
International journal of cancerauthors
Vitali R,Mancini C,Cesi V,Tanno B,Piscitelli M,Mancuso M,Sesti F,Pasquali E,Calabretta B,Dominici C,Raschellà Gdoi
10.1002/ijc.24606subject
Has Abstractpub_date
2009-12-01 00:00:00pages
2547-55issue
11eissn
0020-7136issn
1097-0215journal_volume
125pub_type
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