Adrenomedullin antagonist suppresses tumor formation in renal cell carcinoma through inhibitory effects on tumor endothelial cells and endothelial progenitor mobilization.

Abstract:

:Adrenomedullin (AM) is a multifunctional 52-amino acid peptide. AM has several effects and acts as a growth factor in several types of cancer cells. Our previous study revealed that an AM antagonist (AMA) suppressed the growth of pancreatic tumors in mice, although its mechanism was not elucidated. In this study, we constructed an AMA expression vector and used it to treat renal cell carcinoma (RCC) in mice. This AMA expression vector significantly reduced tumor growth in mice. In addition, microvessel density was decreased in AMA-treated tumors. To analyze the effect of AMA on tumor angiogenesis in this model, tumor endothelial cells (TECs) were isolated from RCC xenografts. TEC proliferation was stimulated by AM and it was inhibited by AMA significantly. AM induced migration of TECs and it was also blocked by AMA. However, normal ECs (NECs) were not affected by either AM or AMA. These results demonstrate that AMA has inhibitory effects on TECs specifically, not on NEC, thereby inhibiting tumor angiogenesis. Furthermore, we showed that vascular endothelial growth factor-induced mobilization of endothelial progenitor cell (EPC) into circulation was inhibited by AMA. These results suggest that AMA can be considered a good anti-angiogenic reagent that selectively targets TECs and EPC in renal cancer.

journal_name

Int J Oncol

authors

Tsuchiya K,Hida K,Hida Y,Muraki C,Ohga N,Akino T,Kondo T,Miseki T,Nakagawa K,Shindoh M,Harabayashi T,Shinohara N,Nonomura K,Kobayashi M

doi

10.3892/ijo_00000622

subject

Has Abstract

pub_date

2010-06-01 00:00:00

pages

1379-86

issue

6

eissn

1019-6439

issn

1791-2423

journal_volume

36

pub_type

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