Redundancy of autocrine loops in human osteosarcoma cells.

Abstract:

:With the aim of identifying innovative therapeutic strategies for osteosarcoma patients who are refractory to conventional chemotherapy, we analyzed the in vitro effects of the blockage of autocrine circuits. Since the insulin-like growth factor-I receptor (IGF-IR)-mediated loop is relevant to the growth of osteosarcoma, we analyzed the activity of the IGF-IR-blocking antibody alphaIR3 in both sensitive and multidrug-resistant osteosarcoma cell lines. Only limited effects, however, were observed, suggesting the simultaneous existence of other autocrine circuits. Indeed, in a representative panel of 12 human osteosarcoma cell lines, in addition to the IGF-IR-mediated circuit, we demonstrated also a loop mediated by epidermal growth factor receptor as well as the presence of nerve growth factor, low-affinity nerve growth factor receptor as well as tyrosine receptor kinase A in the great majority of osteosarcomas. Therapies based on the inhibition of single circuits may have only limited effects in osteosarcoma, whereas the use of suramin, a drug which, besides other activities, non-selectively interferes with the binding of growth factors to their receptors, appears as a promising alternative, in both sensitive and drug-resistant osteosarcoma cells.

journal_name

Int J Cancer

authors

Benini S,Baldini N,Manara MC,Chano T,Serra M,Rizzi S,Lollini PL,Picci P,Scotlandi K

doi

10.1002/(sici)1097-0215(19990209)80:4<581::aid-ijc

subject

Has Abstract

pub_date

1999-02-09 00:00:00

pages

581-8

issue

4

eissn

0020-7136

issn

1097-0215

pii

10.1002/(SICI)1097-0215(19990209)80:4<581::AID-IJC

journal_volume

80

pub_type

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