Bevacizumab changes vascular structure and modulates the expression of angiogenic factors in recurrent malignant gliomas View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2016-04

AUTHORS

Saori Okamoto, Masayuki Nitta, Takashi Maruyama, Tatsuo Sawada, Takashi Komori, Yoshikazu Okada, Yoshihiro Muragaki

ABSTRACT

Bevacizumab (BV), a monoclonal antibody against vascular endothelial growth factor (VEGF), is currently used in the treatment of malignant glioma. To understand mechanisms of resistance to BV, we investigated morphological changes in tumor vessels and expression of angiogenic factors, such as VEGF, Flt-1, basic fibroblast growth factor (bFGF), and platelet-derived growth factor-BB (PDGF-BB), in four autopsied tumors after BV treatment. Three patients had glioblastomas; the fourth had a secondary glioblastoma that developed from a diffuse astrocytoma. BV was administered because of recurrence following the use of the Stupp regimen in these four patients. We compared the initial surgical specimen with that obtained after death following BV treatment. Immunohistochemical staining of the autopsied tumors showed that Flt-1 expression increased while VEGF expression was significantly reduced. Additionally, other angiogenic factors, particularly bFGF, were enhanced. Interestingly, the proliferation of endothelial cells was reduced, but remarkable proliferation of pericytes was observed. These results suggest that following BV treatment, glioblastomas can grow tumor vessels by expressing various angiogenic factors. These mechanisms might be important for rapid regrowth and blood brain barrier repair after BV treatment. Inhibition of multiple angiogenic factors will be required to control tumor vessels in glioblastoma. More... »

PAGES

129-136

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s10014-016-0248-6

DOI

http://dx.doi.org/10.1007/s10014-016-0248-6

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1040503900

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/26826105


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