Insulin-like growth factor 1 (IGF-1) receptors, IGF-1, and IGF-2 are expressed in primary human sarcomas.
A variety of bone and soft-tissue sarcoma cell lines have been shown to express receptors for insulin-like growth factor-1 (IGF-1) and to respond mitogenically to IGF-1 in vitro. We have recently demonstrated evidence of IGF dependency in murine MGH-OGS and RIF-1 sarcomas, which express relatively high and intermediate levels of IGF-1 receptors. Overexpression of IGF-1 receptors and/or IGF ligands might, therefore, be a mechanism by which human bone and soft-tissue sarcomas obtain a proliferative advantage over normal adjacent tissues. Therefore, we evaluated 29 human sarcoma specimens for expression of IGF-1 receptor, IGF-1, and IGF-2 by competitive binding and reverse-transcription polymerase chain reaction (RT-PCR) techniques. Twelve of 29 sarcomas examined by RT-PCR and 13 of 25 examined by affinity-binding studies expressed IGF-1 receptor levels equal to or greater than levels determined in the IGF-responsive MCF-7 breast carcinoma cell line. DNA amplification of the IGF-1 receptor gene was not identified in this group of sarcomas that expressed high levels of IGF-1 receptor. Evaluation of IGF ligand expression by RT-PCR revealed that 22 of 28 sarcomas expressed IGF-1 levels comparable to or above those of the RPMI 7666 control line, and 17 of 27 sarcomas expressed significant levels of IGF-2 compared with the NCI H69 control cell line. These results suggest that autocrine/paracrine regulatory mechanisms might be responsible for the growth of some sarcomas.
Sekyi-Otu
A
A
Samuel Lunenfeld Research Institute, University of Toronto, Ontario, Canada.
Bell
R S
RS
Ohashi
C
C
Pollak
M
M
Andrulis
I L
IL
D001483:Base Sequence; D001667:Binding, Competitive; D005784:Gene Amplification; D006801:Humans; D007334:Insulin-Like Growth Factor I / Q000378:metabolism*; D007335:Insulin-Like Growth Factor II / Q000378:metabolism*; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction; D017526:Receptor, IGF Type 1 / Q000378:metabolism*; D012509:Sarcoma / Q000378:metabolism*
D007334:Insulin-Like Growth Factor I; D007335:Insulin-Like Growth Factor II; D017526:Receptor, IGF Type 1