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CXC趋化因子/CXCR2生物学轴在体外和体内均促进胰腺癌血管生成。

CXC-chemokine/CXCR2 biological axis promotes angiogenesis in vitro and in vivo in pancreatic cancer.

作者信息

Matsuo Yoichi, Raimondo Massimo, Woodward Timothy A, Wallace Michael B, Gill Kanwar R, Tong Zhimin, Burdick Marie D, Yang Zhijian, Strieter Robert M, Hoffman Robert M, Guha Sushovan

机构信息

Department of Gastroenterology, Hepatology and Nutrition, The University of Texas M. D. Anderson Cancer Center, Houston, 77030, USA.

出版信息

Int J Cancer. 2009 Sep 1;125(5):1027-37. doi: 10.1002/ijc.24383.

Abstract

Angiogenesis is essential for tumor growth and metastasis. Although ELR(+)-CXC-chemokines and their corresponding receptor, CXC-receptor 2 (CXCR2), are known mediators of angiogenesis, little is known about their role in pancreatic cancer (PaCa). The aim of our study was to determine the role of ELR(+)-CXC-chemokine/CXCR2 biological axis in promoting PaCa angiogenesis. We prospectively collected secretin-stimulated exocrine pancreatic secretions (SSEPS) from normal individuals (NP) and PaCa patients. We showed that summed concentrations of ELR(+)-CXC-chemokines in SSEPS from PaCa patients were significantly higher than in those from NP (p = 0.002). We measured ELR(+)-CXC-chemokine levels in supernatants from multiple PaCa cell lines and confirmed that BxPC-3, Colo-357 and Panc-28 had significantly higher expression compared with an immortalized human pancreatic ductal epithelial (HPDE) cell line. After confirming lack of autocrine effects of ELR(+)-CXC-chemokines on PaCa cells (due to absence of CXCR2 expression), we investigated paracrine effects of these chemokines on human umbilical vein endothelial cells (HUVEC). Both recombinant ELR(+)-CXC-chemokines and co-culturing with BxPC-3 significantly enhanced proliferation, invasion, and tube formation of HUVEC (p < 0.05). These biological effects were significantly inhibited by treatment with a neutralizing antibody against CXCR2 (anti-CXCR2 Ab) (p < 0.05). Finally, anti-CXCR2 Ab significantly reduced tumor volume (p < 0.05), Ki-67 proliferation index (p = 0.043) and Factor VIII(+) microvessel density (p = 0.004) in an orthotopic nude mouse PaCa model. Our results show that ELR(+)-CXC-chemokines promote PaCa tumor-associated angiogenesis through CXCR2, suggesting that CXCR2 is an anti-angiogenic target in PaCa.

摘要

血管生成对于肿瘤的生长和转移至关重要。虽然ELR(+) - CXC趋化因子及其相应受体CXC受体2(CXCR2)是已知的血管生成介质,但它们在胰腺癌(PaCa)中的作用却知之甚少。我们研究的目的是确定ELR(+) - CXC趋化因子/CXCR2生物学轴在促进PaCa血管生成中的作用。我们前瞻性地收集了正常个体(NP)和PaCa患者的促胰液素刺激的胰腺外分泌液(SSEPS)。我们发现,PaCa患者SSEPS中ELR(+) - CXC趋化因子的总浓度显著高于NP患者(p = 0.002)。我们测量了多个PaCa细胞系上清液中的ELR(+) - CXC趋化因子水平,并证实与永生化人胰腺导管上皮(HPDE)细胞系相比,BxPC - 3、Colo - 357和Panc - 28具有显著更高的表达。在确认ELR(+) - CXC趋化因子对PaCa细胞缺乏自分泌作用(由于缺乏CXCR2表达)后,我们研究了这些趋化因子对人脐静脉内皮细胞(HUVEC)的旁分泌作用。重组ELR(+) - CXC趋化因子以及与BxPC - 3共培养均显著增强了HUVEC的增殖、侵袭和管腔形成(p < 0.05)。用抗CXCR2中和抗体(抗CXCR2 Ab)处理可显著抑制这些生物学效应(p < 0.05)。最后,在原位裸鼠PaCa模型中,抗CXCR2 Ab显著降低了肿瘤体积(p < 0.05)、Ki - 67增殖指数(p = 0.043)和因子VIII(+)微血管密度(p = 0.004)。我们的结果表明,ELR(+) - CXC趋化因子通过CXCR2促进PaCa肿瘤相关血管生成,提示CXCR2是PaCa中的一个抗血管生成靶点。

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