Growth, angiogenesis and MVD, increase of apoptosis suppression of tumour growth and tumour blood flow

Growth, angiogenesis and MVD, increase of apoptosis suppression of tumour growth and tumour blood flow inhibition of tumour growth, peritoneal dissemination, ascites accumulationCancer cells / mouse modells L3.6pl PANC-1 and PK-Reference 44EGF-R, VEGF-R, PDGF-R HGFA/J mice, C3H mice, Balb/ cAnNCrl-nuBr nude mice SUIT-50designed focusing on abrogating signaling of these ligands. Hereby we summarize the most promising therapeutic approaches executed on human cancer cell lines or in animal models of S28463 web pancreatic cancer.Epidermal Growth Factor Nude mice were treated with a novel orally given EGF-R tyrosine PubMed ID: kinase inhibitor, PKI 166 (4-(R)-phenethylamino-6-(hydroxyl)phenyl-7H-pyrrolo [2.3-d]-pyrimidine), 7 days after orthotopic injection of L3.6pl human pancreatic cancer cells. The volume of pancreatic cancers was reduced by 59 in mice treated with gemcitabine, by 45 in mice treated with PKI 166, and by 85 in those treated with both drugs. The combination therapy also significantly inhibited lymph node and liver metastasis formation, which led to a significant improvement in overall survival. EGF-R activation was significantly blocked by therapy with PKI 166 and was associated with a significant decrease in tumour cell production of VEGF and IL-8, which correlated with a significant reduction in angiogenesis, and an increase in apoptotic tumour and endothelial cells [49?1].PK-8 were utilized as lower- and higher-VEGF-producing cell lines, respectively. The in vitro proliferation of cancer cells infected with adenovirus vectors encoding soluble flt-1 (Adsflt) and control vectors (AdLacZ) exhibited no difference. Cancer cells were inoculated in severe combined immunodeficient (SCID) mice in order to evaluate the in vivo tumour growth suppression. Adsflt, AdLacZ, or vehicle was injected directly into the tumours. The tumour growth and the MVD of the Adsflt-treated group was significantly inhibited both in PANC-1 cells and PK-8 cells. Apoptosis index increased and tumour angiogenesis decreased in the Adsflt group in contrast to groups of wildtype cells and AdLacZ-infected cells [53,54]. Injection of 100 mg/kg of SU6668 (inhibitor of the receptor-tyrosine kinase activity of VEGF, FGF, and PDGF) markedly suppressed tumour growth and decreased tumour blood flow in CFPAC human pancreatic carcinoma cells and additionally extended survival in tumour-bearing mice compared to control. Daily SU6668 administration and a single dose of 15 Gy of X-irradiation was significantly more effective than either treatment alone in suppressing tumour growth [55].Platelet-Derived Growth Factor The recent introducton of the signal transduction inhibitor imatinib mesylate (formerly ST1571) has had an important influence on the practice of oncology as well as on the process of drug development [56]. Imatinib mesylate was originally designed to specifically target chronic myeloid leukemia (CML) by blocking bcr-abl oncoprotein [57]. Having obtained larger amount of experience, imatinib mesylate proved to have a striking activity against gastrointestinal stromal tumours (GISTs) as well by blocking c-kit [58]. PDGF was one of the first polypeptide growth factors identified that signals through a cell surface tyrosine kinase receptor to stimulate several cellular functions including growth, proliferation, and differentiation in various cancers such as prostate and pancreatic cancer [59]. Since imatinib mesylate inhibits the PDGF-R kinasePage 4 of(page number not for citation.