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Title: Epigenetic Regulation of KLHL34 Predictive of Pathologic Response to Preoperative Chemoradiation Therapy in Rectal Cancer Patients

Abstract

Purpose: Prediction of individual responsiveness to preoperative chemoradiation therapy (CRT) is urgently needed in patients with poorly responsive locally advanced rectal cancer (LARC). Methods and Materials: Candidate methylation genes associated with radiosensitivity were identified using a 3-step process. In the first step, genome-wide screening of methylation genes was performed in correlation with histopathologic tumor regression grade in 45 patients with LARC. In the second step, the methylation status of selected sites was analyzed by pyrosequencing in 67 LARC patients, including 24 patients analyzed in the first step. Finally, colorectal cancer cell clones with stable KLHL34 knockdown were generated and tested for cellular sensitivity to radiation. Results: Genome-wide screening identified 7 hypermethylated CpG sites (DZIP1 cg24107021, DZIP1 cg26886381, ZEB1 cg04430381, DKK3 cg041006961, STL cg00991794, KLHL34 cg01828474, and ARHGAP6 cg07828380) associated with preoperative CRT responses. Radiosensitivity in patients with hypermethylated KLHL34 cg14232291 was confirmed by pyrosequencing in additional cohorts. Knockdown of KLHL34 significantly reduced colony formation (KLHL34 sh#1: 20.1%, P=.0001 and KLHL34 sh#2: 15.8%, P=.0002), increased the cytotoxicity (KLHL34 sh#1: 14.8%, P=.019 and KLHL34 sh#2: 17.9%, P=.007) in LoVo cells, and increased radiation-induced caspase-3 activity and the sub-G1 population of cells. Conclusions: The methylation status of KLHL34 cg14232291 may be a predictivemore » candidate of sensitivity to preoperative CRT, although further validation is needed in large cohorts using various cell types.« less

Authors:
 [1];  [2];  [1];  [1];  [2];  [3];  [2]; ;  [4];  [5];  [5];  [2];  [4];  [2];  [1];  [2]
  1. Department of Surgery, University of Ulsan College of Medicine, Seoul (Korea, Republic of)
  2. (Korea, Republic of)
  3. Institute of Innovative Cancer Research and Asan Institute for Life Sciences, Asan Medical Center, Seoul (Korea, Republic of)
  4. Medical Genomics Research Center, Korea Research Institute of Bioscience & Biotechnology, Daejeon (Korea, Republic of)
  5. Department of Radiation Oncology, University of Ulsan College of Medicine, Seoul (Korea, Republic of)
Publication Date:
OSTI Identifier:
22458636
Resource Type:
Journal Article
Resource Relation:
Journal Name: International Journal of Radiation Oncology, Biology and Physics; Journal Volume: 91; Journal Issue: 3; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
62 RADIOLOGY AND NUCLEAR MEDICINE; COLONY FORMATION; CORRELATIONS; FORECASTING; GENES; METHYLATION; NEOPLASMS; PATIENTS; RADIOSENSITIVITY; RECTUM; SCREENING; TOXICITY

Citation Formats

Ha, Ye J., Institute of Innovative Cancer Research and Asan Institute for Life Sciences, Asan Medical Center, Seoul, Kim, Chan W., Roh, Seon A., Institute of Innovative Cancer Research and Asan Institute for Life Sciences, Asan Medical Center, Seoul, Cho, Dong H., Graduate School of East-West Medical Science, Kyung Hee University, Gyeonggi-do, Park, Jong L., Kim, Seon Y., Kim, Jong H., Choi, Eun K., Institute of Innovative Cancer Research and Asan Institute for Life Sciences, Asan Medical Center, Seoul, Kim, Yong S., E-mail: yongsung@kribb.re.kr, Institute of Innovative Cancer Research and Asan Institute for Life Sciences, Asan Medical Center, Seoul, Kim, Jin C., E-mail: jckim@amc.seoul.kr, and Institute of Innovative Cancer Research and Asan Institute for Life Sciences, Asan Medical Center, Seoul. Epigenetic Regulation of KLHL34 Predictive of Pathologic Response to Preoperative Chemoradiation Therapy in Rectal Cancer Patients. United States: N. p., 2015. Web. doi:10.1016/J.IJROBP.2014.11.013.
Ha, Ye J., Institute of Innovative Cancer Research and Asan Institute for Life Sciences, Asan Medical Center, Seoul, Kim, Chan W., Roh, Seon A., Institute of Innovative Cancer Research and Asan Institute for Life Sciences, Asan Medical Center, Seoul, Cho, Dong H., Graduate School of East-West Medical Science, Kyung Hee University, Gyeonggi-do, Park, Jong L., Kim, Seon Y., Kim, Jong H., Choi, Eun K., Institute of Innovative Cancer Research and Asan Institute for Life Sciences, Asan Medical Center, Seoul, Kim, Yong S., E-mail: yongsung@kribb.re.kr, Institute of Innovative Cancer Research and Asan Institute for Life Sciences, Asan Medical Center, Seoul, Kim, Jin C., E-mail: jckim@amc.seoul.kr, & Institute of Innovative Cancer Research and Asan Institute for Life Sciences, Asan Medical Center, Seoul. Epigenetic Regulation of KLHL34 Predictive of Pathologic Response to Preoperative Chemoradiation Therapy in Rectal Cancer Patients. United States. doi:10.1016/J.IJROBP.2014.11.013.
Ha, Ye J., Institute of Innovative Cancer Research and Asan Institute for Life Sciences, Asan Medical Center, Seoul, Kim, Chan W., Roh, Seon A., Institute of Innovative Cancer Research and Asan Institute for Life Sciences, Asan Medical Center, Seoul, Cho, Dong H., Graduate School of East-West Medical Science, Kyung Hee University, Gyeonggi-do, Park, Jong L., Kim, Seon Y., Kim, Jong H., Choi, Eun K., Institute of Innovative Cancer Research and Asan Institute for Life Sciences, Asan Medical Center, Seoul, Kim, Yong S., E-mail: yongsung@kribb.re.kr, Institute of Innovative Cancer Research and Asan Institute for Life Sciences, Asan Medical Center, Seoul, Kim, Jin C., E-mail: jckim@amc.seoul.kr, and Institute of Innovative Cancer Research and Asan Institute for Life Sciences, Asan Medical Center, Seoul. Sun . "Epigenetic Regulation of KLHL34 Predictive of Pathologic Response to Preoperative Chemoradiation Therapy in Rectal Cancer Patients". United States. doi:10.1016/J.IJROBP.2014.11.013.
@article{osti_22458636,
title = {Epigenetic Regulation of KLHL34 Predictive of Pathologic Response to Preoperative Chemoradiation Therapy in Rectal Cancer Patients},
author = {Ha, Ye J. and Institute of Innovative Cancer Research and Asan Institute for Life Sciences, Asan Medical Center, Seoul and Kim, Chan W. and Roh, Seon A. and Institute of Innovative Cancer Research and Asan Institute for Life Sciences, Asan Medical Center, Seoul and Cho, Dong H. and Graduate School of East-West Medical Science, Kyung Hee University, Gyeonggi-do and Park, Jong L. and Kim, Seon Y. and Kim, Jong H. and Choi, Eun K. and Institute of Innovative Cancer Research and Asan Institute for Life Sciences, Asan Medical Center, Seoul and Kim, Yong S., E-mail: yongsung@kribb.re.kr and Institute of Innovative Cancer Research and Asan Institute for Life Sciences, Asan Medical Center, Seoul and Kim, Jin C., E-mail: jckim@amc.seoul.kr and Institute of Innovative Cancer Research and Asan Institute for Life Sciences, Asan Medical Center, Seoul},
abstractNote = {Purpose: Prediction of individual responsiveness to preoperative chemoradiation therapy (CRT) is urgently needed in patients with poorly responsive locally advanced rectal cancer (LARC). Methods and Materials: Candidate methylation genes associated with radiosensitivity were identified using a 3-step process. In the first step, genome-wide screening of methylation genes was performed in correlation with histopathologic tumor regression grade in 45 patients with LARC. In the second step, the methylation status of selected sites was analyzed by pyrosequencing in 67 LARC patients, including 24 patients analyzed in the first step. Finally, colorectal cancer cell clones with stable KLHL34 knockdown were generated and tested for cellular sensitivity to radiation. Results: Genome-wide screening identified 7 hypermethylated CpG sites (DZIP1 cg24107021, DZIP1 cg26886381, ZEB1 cg04430381, DKK3 cg041006961, STL cg00991794, KLHL34 cg01828474, and ARHGAP6 cg07828380) associated with preoperative CRT responses. Radiosensitivity in patients with hypermethylated KLHL34 cg14232291 was confirmed by pyrosequencing in additional cohorts. Knockdown of KLHL34 significantly reduced colony formation (KLHL34 sh#1: 20.1%, P=.0001 and KLHL34 sh#2: 15.8%, P=.0002), increased the cytotoxicity (KLHL34 sh#1: 14.8%, P=.019 and KLHL34 sh#2: 17.9%, P=.007) in LoVo cells, and increased radiation-induced caspase-3 activity and the sub-G1 population of cells. Conclusions: The methylation status of KLHL34 cg14232291 may be a predictive candidate of sensitivity to preoperative CRT, although further validation is needed in large cohorts using various cell types.},
doi = {10.1016/J.IJROBP.2014.11.013},
journal = {International Journal of Radiation Oncology, Biology and Physics},
number = 3,
volume = 91,
place = {United States},
year = {Sun Mar 01 00:00:00 EST 2015},
month = {Sun Mar 01 00:00:00 EST 2015}
}