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http://purl.uniprot.org/citations/14871970http://www.w3.org/1999/02/22-rdf-syntax-ns#typehttp://purl.uniprot.org/core/Journal_Citation
http://purl.uniprot.org/citations/14871970http://www.w3.org/2000/01/rdf-schema#comment"

Purpose

The use of tyrosine kinase receptor inhibitors is increasingly becoming a valuable therapeutic alternative in tumors carrying activated tyrosine kinase receptors. In a previous study, we described a coexpression of KIT and stem cell factor (SCF) mRNA in Synovial sarcomas, (SS) and in a limited number of cases, we demonstrated the presence of an activated receptor. Here, in a wider number of cases, we investigated the expression level and phosphorylation status of two structurally related tyrosine kinase receptors, KIT and platelet-derived growth factor receptor beta (PDGFRbeta), at the light of their role as possible targets of tyrosine kinase receptors inhibitor molecules.

Experimental design

Forty-three SS cases were analyzed for KIT and PDGFRbeta expression/activation by immunoprecipitation/Western blotting experiments. The cognate ligands, SCF and PDGFB, were detected by reverse transcription-PCR.

Results

KIT was observed in 48 and 41% (45% total) whereas PDGFRbeta in 54 and 33% (45% total) of monophasic and biphasic SS cases, respectively. With respect to the fusion transcript type SYTSSX1 and SYTSSX2, KIT was more expressed in SYTSSX1 carrying cases (48 versus 38%), whereas PDGFRbeta resulted more frequently expressed in SYTSSX2 ones (54 versus 37%). When expressed, the receptors were phosphorylated. Their ligands were detected in all of the activated cases.

Conclusions

About 70% of the cases express one of the two activated tyrosine kinase receptors with a mutually exclusive expression trend. Coexpression is not frequent and seems to be restricted to monophasic subtype. These data indicate that a consistent fraction of this tumor type could represent a good candidate for kinase inhibitor molecules effective on KIT and PDGFRbeta where their activation is sustained by an autocrine loop."xsd:string
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http://purl.uniprot.org/citations/14871970http://purl.uniprot.org/core/author"Greco A."xsd:string
http://purl.uniprot.org/citations/14871970http://purl.uniprot.org/core/author"Pierotti M.A."xsd:string
http://purl.uniprot.org/citations/14871970http://purl.uniprot.org/core/author"Tamborini E."xsd:string
http://purl.uniprot.org/citations/14871970http://purl.uniprot.org/core/author"Pilotti S."xsd:string
http://purl.uniprot.org/citations/14871970http://purl.uniprot.org/core/author"Riva C."xsd:string
http://purl.uniprot.org/citations/14871970http://purl.uniprot.org/core/author"Gronchi A."xsd:string
http://purl.uniprot.org/citations/14871970http://purl.uniprot.org/core/author"Bertulli R."xsd:string
http://purl.uniprot.org/citations/14871970http://purl.uniprot.org/core/author"Bonadiman L."xsd:string
http://purl.uniprot.org/citations/14871970http://purl.uniprot.org/core/author"Casali P.G."xsd:string
http://purl.uniprot.org/citations/14871970http://purl.uniprot.org/core/date"2004"xsd:gYear
http://purl.uniprot.org/citations/14871970http://purl.uniprot.org/core/name"Clin Cancer Res"xsd:string
http://purl.uniprot.org/citations/14871970http://purl.uniprot.org/core/pages"938-943"xsd:string
http://purl.uniprot.org/citations/14871970http://purl.uniprot.org/core/title"Expression of ligand-activated KIT and platelet-derived growth factor receptor beta tyrosine kinase receptors in synovial sarcoma."xsd:string
http://purl.uniprot.org/citations/14871970http://purl.uniprot.org/core/volume"10"xsd:string
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