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PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2004-2-23
pubmed:abstractText
We reported previously that an angiogenesis inhibitor, E7820, inhibits in vitro tube formation of human umbilical vein endothelial cell through the suppression of integrin alpha2 expression. Here we describe the antiangiogenic and antitumor effects of E7820 in mice and discuss the feasibility of using platelet integrin alpha2 expression on platelets as a biological marker of the efficacy of E7820. Oral administration of E7820 significantly inhibited basic fibroblast growth factor-induced angiogenesis in Matrigel implants and human colon WiDr tumor-induced angiogenesis in a dorsal air sac model. Twice-daily treatment with E7820 clearly inhibited the s.c. tumor growth of seven tumor cell lines derived from human colon, breast, pancreas, and kidney, and completely suppressed the growth of human pancreatic KP-1 and human colon LoVo cell lines. Moreover, E7820 significantly inhibited the growth of KP-1 and human colon tumor Colo320DM cells orthotopically implanted in the pancreas and cecum, respectively. The efficacy of E7820 was comparable in the s.c. and orthotopic transplantation models. Immunohistochemical analyses using anti-CD31 antibody showed that E7820 significantly reduced microvessel density in orthotopically implanted KP-1 tumor. E7820 reduced integrin alpha2 expression on a megakaryocytic cell line, Dami cells, induced by phorbol 12-myristate 13-acetate treatment. It also decreased the expression level of integrin alpha2 on platelets withdrawn from mice bearing s.c. KP-1 tumor at a dosage close to that affording antitumor activity. These data demonstrate that E7820 showed a broad-spectrum antitumor effect in mice through inhibition of angiogenesis and indicate that the decrease of integrin alpha2 on platelets might serve as a biological marker for the antitumor efficacy of E7820.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
1078-0432
pubmed:author
pubmed:issnType
Print
pubmed:day
15
pubmed:volume
10
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1430-8
pubmed:dateRevised
2005-6-17
pubmed:meshHeading
pubmed-meshheading:14977846-Angiogenesis Inhibitors, pubmed-meshheading:14977846-Animals, pubmed-meshheading:14977846-Antibodies, Monoclonal, pubmed-meshheading:14977846-Antigens, CD31, pubmed-meshheading:14977846-Antineoplastic Agents, pubmed-meshheading:14977846-Blood Platelets, pubmed-meshheading:14977846-Cell Division, pubmed-meshheading:14977846-Cell Line, Tumor, pubmed-meshheading:14977846-Cells, Cultured, pubmed-meshheading:14977846-Dose-Response Relationship, Drug, pubmed-meshheading:14977846-Endothelium, Vascular, pubmed-meshheading:14977846-Female, pubmed-meshheading:14977846-Flow Cytometry, pubmed-meshheading:14977846-Humans, pubmed-meshheading:14977846-Indoles, pubmed-meshheading:14977846-Integrin alpha2, pubmed-meshheading:14977846-Mice, pubmed-meshheading:14977846-Neoplasm Transplantation, pubmed-meshheading:14977846-Sulfonamides, pubmed-meshheading:14977846-Time Factors, pubmed-meshheading:14977846-Tumor Markers, Biological, pubmed-meshheading:14977846-Umbilical Veins
pubmed:year
2004
pubmed:articleTitle
An angiogenesis inhibitor E7820 shows broad-spectrum tumor growth inhibition in a xenograft model: possible value of integrin alpha2 on platelets as a biological marker.
pubmed:affiliation
Tsukuba Research Laboratories, Eisai Co, Ltd, Ibaraki, Japan. r-semba@hhc.eisai.co.jp
pubmed:publicationType
Journal Article