Abstract：
:Vascular endothelial growth factor (VEGF)-C is a lymphangiogenic factor implicated in lymphatic metastasis. In this study, we investigated the role of the type I insulin-like growth factor receptor (IGF-IR) in the regulation of VEGF-C expression. We used Lewis lung carcinoma subline M-27 cells transfected with human IGF-IR cDNA. These cells, but not the wild-type cells, expressed VEGF-C mRNA, produced a M(r) 58,000 VEGF-C precursor protein, and secreted a M(r) 29,000 processed form in response to IGF-I. In vivo, they acquired a lymph node metastasizing potential. VEGF-C induction was abolished in cells expressing an IGF-IR with tyrosine-phenylalanine substitutions in the kinase domain, but not in the COOH-terminal domain. The induction was phosphatidylinositol 3'-kinase dependent and, to a lesser extent, mitogen-activated protein kinase signaling dependent, as determined by the use of the respective inhibitors LY294002 (84.6% reduction) and PD98059 (38% reduction). The results identify the IGF-IR as a positive regulator of VEGF-C expression and implicate it in the control of lymphatic metastasis.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Tang Y,Zhang D,Fallavollita L,Brodt Psubject
Has Abstractpub_date
2003-03-15 00:00:00pages
1166-71issue
6eissn
0008-5472issn
1538-7445journal_volume
63pub_type
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