miR-99b-targeted mTOR induction contributes to irradiation resistance in pancreatic cancer

Molecular Cancer

Research

Feng Wei¹  Guangyi Wang¹  Yan Liu²  Xiaochang Xue³  An Xiang⁴  Zifan Lu⁴  Yanhai Guo⁴ 

[1] Department of Hepatobiliary & Pancreas Surgery, the First Hospital, Jilin University, Changchun, China;Institute of Military Veterinary Medicine, Academy of Military Medical Sciences, Changchun, China;State Key Laboratory of Cancer Biology, Department of Pharmacogenomics, School of Pharmacy, the Fourth Military Medical University, Xi’an, China;State Key Laboratory of Cancer Biology, Department of Biopharmaceutics, School of Pharmacy, the Fourth Military Medical University, Xi’an, China;State Key Laboratory of Cancer Biology, Department of Pharmacogenomics, School of Pharmacy, the Fourth Military Medical University, Xi’an, China;

关键词: Radiation resistance;    mTOR;    AZD8055;    Pancreatic cancer;   

DOI  :  10.1186/1476-4598-12-81

 received in 2013-04-08, accepted in 2013-07-22,  发布年份 2013

来源: Springer

【 摘 要 】

BackgroundRadiation exerts direct antitumor effects and is widely used in clinics, but the efficacy is severely compromised by tumor resistance. Therefore uncovering the mechanism of radioresistance might promote the development of new strategies to overcome radioresistance by manipulating activity of the key molecules.MethodsImmunohistochemistry were used to find whether mTOR were over-activated in radioresistant patients’ biopsies. Then Western blot, real-time PCR and transfection were used to find whether radiotherapy regulates the expression and activity of mTOR by modulating its targeting microRNA in human pancreatic cancer cell lines PANC-1, Capan-2 and BxPC-3. Finally efficacy of radiation combined with mTOR dual inhibitor AZD8055 was assessed in vitro and in vivo.ResultsIonizing radiation promoted mTOR expression and activation in pancreatic cancer cells through reducing miR-99b expression, which negatively regulated mTOR. Novel mTOR inhibitor, AZD8055 (10 nM, 100 nM, 500 nM) synergistically promoted radiation (0–10 Gy) induced cell growth inhibition and apoptosis. In human pancreatic cancer xenografts, fractionated radiation combined with AZD8055 treatment further increased the anti-tumor effect, the tumor volume was shrinked to 278 mm3 after combination treatment for 3 weeks compared with single radiation (678 mm3) or AZD8055 (708 mm3) treatment (P < 0.01).ConclusionsOur data provide a rationale for overcoming radio-resistance by combined with mTOR inhibitor AZD8055 in pancreatic cancer therapy.

【 授权许可】

Unknown   
© Wei et al.; licensee BioMed Central Ltd. 2013. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.