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pubmed-article:20514290pubmed:abstractTextEstrogen-induced pituitary prolactin-producing tumors (PRLoma) in F344 rats express a high level of vascular endothelial growth factor (VEGF) associated with marked angiogenesis and angiectasis. To investigate whether tumor development in E2-induced PRLoma is inhibited by anti-VEGF monoclonal antibody (G6-31), we evaluated tumor growth and observed the vascular structures. With simultaneous treatment with G6-31 for the latter three weeks of the 13-week period of E2 stimulation (E2+G6-31 group), the following inhibitory effects on the PRLoma were observed in the E2+G6-31 group as compared with the E2-only group. In the E2+G6-31 group, a tendency to reduction in pituitary weight was observed and significant differences were observed as (1) reductions in the Ki-67-positive anterior cells, (2) increases in TUNEL-positive anterior cells, and (3) repair of the microvessel count by CD34-immunohistochemistry. The characteristic "blood lakes" in PRLomas were improved and replaced by repaired microvascular structures on 3D observation using confocal laser scanning microscope. These inhibitory effects due to anti-VEGF antibody might be related to the autocrine/paracrine action of VEGF on the tumor cells, because VEGF and its receptor are co-expressed on the tumor cells. Thus, our results demonstrate that anti-VEGF antibody exerted inhibitory effects on pituitary tumorigenesis in well-established E2 induced PRLomas.lld:pubmed
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pubmed-article:20514290pubmed:authorpubmed-author:ItohJohbuJlld:pubmed
pubmed-article:20514290pubmed:authorpubmed-author:TakekoshiSusu...lld:pubmed
pubmed-article:20514290pubmed:authorpubmed-author:MiyajimaKatsu...lld:pubmed
pubmed-article:20514290pubmed:authorpubmed-author:OsamuraRobert...lld:pubmed
pubmed-article:20514290pubmed:authorpubmed-author:MiyakoshiTaka...lld:pubmed
pubmed-article:20514290pubmed:authorpubmed-author:KakimotoKochi...lld:pubmed
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pubmed-article:20514290pubmed:volume43lld:pubmed
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pubmed-article:20514290pubmed:pagination33-44lld:pubmed
pubmed-article:20514290pubmed:year2010lld:pubmed
pubmed-article:20514290pubmed:articleTitleInhibitory effects of anti-VEGF antibody on the growth and angiogenesis of estrogen-induced pituitary prolactinoma in Fischer 344 Rats: animal model of VEGF-targeted therapy for human endocrine tumors.lld:pubmed
pubmed-article:20514290pubmed:affiliationDepartment of Pathology, Tokai University School of Medicine, 143 Shimokasuya, Isehara, Kanagawa 259-1193, Japan.lld:pubmed
pubmed-article:20514290pubmed:publicationTypeJournal Articlelld:pubmed
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