Abstract:
:von Willebrand factor (vWF), a glycoprotein produced uniquely by endothelial cells and megakaryocytes, is routinely used to identify vessels in tissue sections. Vessel density in tumor specimens, as determined by immuno-histochemical staining for vWF or other endothelial cell markers, is a negative prognostic factor for many solid tumors. vWF is heterogeneously distributed throughout the vasculature, transcriptional control in response to the tissue microenvironment being responsible for local variations in endothelial cell levels of vWF. Here, we report that fibroblast growth factor-2 and vascular endothelial growth factor, potent angiogenesis inducers expressed in a variety of tumors, up-regulate expression of vWF mRNA and protein in cultured endothelial cells with a synergistic effect. Our data support the measurement of vWF mRNA in tumors to detect activated endothelium or angiogenesis. For this purpose, we developed a semi-quantitative RT-PCR for vWF mRNA. Preliminary results obtained with specimens from colon carcinoma and the corresponding normal colonic mucosa showed higher vWF mRNA levels in most tumors than in their normal counterparts. The differences in vWF mRNA levels were much larger than the differences in vessel counts between a tumor and the corresponding normal mucosa, indicating that high vWF mRNA levels in tumors may indeed be an early sign of activation of the endothelium. The rapidity, objectivity, sensitivity and specificity of this technique make it suitable for routine clinical application to identify aggressive, highly angiogenic tumors.
journal_name
Int J Cancerjournal_title
International journal of cancerauthors
Zanetta L,Marcus SG,Vasile J,Dobryansky M,Cohen H,Eng K,Shamamian P,Mignatti Pdoi
10.1002/(sici)1097-0215(20000115)85:2<281::aid-ijckeywords:
subject
Has Abstractpub_date
2000-01-15 00:00:00pages
281-8issue
2eissn
0020-7136issn
1097-0215pii
10.1002/(SICI)1097-0215(20000115)85:2<281::AID-IJCjournal_volume
85pub_type
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