Olfactory Receptor Family 7 Subfamily C Member 1 Is a Novel Marker of Colon Cancer-Initiating Cells and Is a Potent Target of Immunotherapy

Cancer-initiating cells (CICs) are thought to be essential for tumor maintenance, recurrence, and distant metastasis, and they are therefore reasonable targets for cancer therapy. Cancer immunotherapy is a novel approach to target cancer. In this study, we aimed to establish novel CIC-targeting immu...

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Veröffentlicht in:Clinical cancer research 2016-07, Vol.22 (13), p.3298-3309
Hauptverfasser: Morita, Rena, Hirohashi, Yoshihiko, Torigoe, Toshihiko, Ito-Inoda, Satoko, Takahashi, Akari, Mariya, Tasuku, Asanuma, Hiroko, Tamura, Yasuaki, Tsukahara, Tomohide, Kanaseki, Takayuki, Kubo, Terufumi, Kutomi, Goro, Mizuguchi, Toru, Terui, Takeshi, Ishitani, Kunihiko, Hashino, Satoshi, Kondo, Toru, Minagawa, Nozomi, Takahashi, Norihiko, Taketomi, Akinobu, Todo, Satoru, Asaka, Masahiro, Sato, Noriyuki
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container_issue 13
container_start_page 3298
container_title Clinical cancer research
container_volume 22
creator Morita, Rena
Hirohashi, Yoshihiko
Torigoe, Toshihiko
Ito-Inoda, Satoko
Takahashi, Akari
Mariya, Tasuku
Asanuma, Hiroko
Tamura, Yasuaki
Tsukahara, Tomohide
Kanaseki, Takayuki
Kubo, Terufumi
Kutomi, Goro
Mizuguchi, Toru
Terui, Takeshi
Ishitani, Kunihiko
Hashino, Satoshi
Kondo, Toru
Minagawa, Nozomi
Takahashi, Norihiko
Taketomi, Akinobu
Todo, Satoru
Asaka, Masahiro
Sato, Noriyuki
description Cancer-initiating cells (CICs) are thought to be essential for tumor maintenance, recurrence, and distant metastasis, and they are therefore reasonable targets for cancer therapy. Cancer immunotherapy is a novel approach to target cancer. In this study, we aimed to establish novel CIC-targeting immunotherapy. Colorectal cancer (CRC) CICs were isolated as side population (SP) cells. The gene expression profile of CRC CICs was analyzed by cDNA microarray and RT-PCR. Protein expression of olfactory receptor family 7 subfamily C member 1 (OR7C1) were analyzed by Western blot and immunohistochemical staining. The functions of OR7C1 were analyzed by gene overexpression and gene knockdown using siRNAs. OR7C1-positive cells were isolated by a flow cytometer and analyzed. CTLs specific for OR7C1 peptide were generated, and the antitumor effect was addressed by mice adoptive transfer model. OR7C1 has essential roles in the maintenance of colon CICs, and the OR7C1-positive population showed higher tumorigenicity than that of the OR7C1-negative population, indicating that OR7C1 is a novel functional marker for colon CIC. Immunohistochemical staining revealed that OR7C1 high expression was correlated with poorer prognosis in CRC patients. OR7C1-derived antigenic peptide-specific CTLs showed specific cytotoxicity for CICs, and an OR7C1-specific CTL clone showed a greater antitumor effect than did a CTL clone targeting all cancer cells in a CTL adoptive transfer mouse model. OR7C1 is a novel marker for colon CICs and can be a target of potent CIC-targeting immunotherapy. Clin Cancer Res; 22(13); 3298-309. ©2016 AACR.
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Cancer immunotherapy is a novel approach to target cancer. In this study, we aimed to establish novel CIC-targeting immunotherapy. Colorectal cancer (CRC) CICs were isolated as side population (SP) cells. The gene expression profile of CRC CICs was analyzed by cDNA microarray and RT-PCR. Protein expression of olfactory receptor family 7 subfamily C member 1 (OR7C1) were analyzed by Western blot and immunohistochemical staining. The functions of OR7C1 were analyzed by gene overexpression and gene knockdown using siRNAs. OR7C1-positive cells were isolated by a flow cytometer and analyzed. CTLs specific for OR7C1 peptide were generated, and the antitumor effect was addressed by mice adoptive transfer model. OR7C1 has essential roles in the maintenance of colon CICs, and the OR7C1-positive population showed higher tumorigenicity than that of the OR7C1-negative population, indicating that OR7C1 is a novel functional marker for colon CIC. 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Cancer immunotherapy is a novel approach to target cancer. In this study, we aimed to establish novel CIC-targeting immunotherapy. Colorectal cancer (CRC) CICs were isolated as side population (SP) cells. The gene expression profile of CRC CICs was analyzed by cDNA microarray and RT-PCR. Protein expression of olfactory receptor family 7 subfamily C member 1 (OR7C1) were analyzed by Western blot and immunohistochemical staining. The functions of OR7C1 were analyzed by gene overexpression and gene knockdown using siRNAs. OR7C1-positive cells were isolated by a flow cytometer and analyzed. CTLs specific for OR7C1 peptide were generated, and the antitumor effect was addressed by mice adoptive transfer model. OR7C1 has essential roles in the maintenance of colon CICs, and the OR7C1-positive population showed higher tumorigenicity than that of the OR7C1-negative population, indicating that OR7C1 is a novel functional marker for colon CIC. 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Immunohistochemical staining revealed that OR7C1 high expression was correlated with poorer prognosis in CRC patients. OR7C1-derived antigenic peptide-specific CTLs showed specific cytotoxicity for CICs, and an OR7C1-specific CTL clone showed a greater antitumor effect than did a CTL clone targeting all cancer cells in a CTL adoptive transfer mouse model. OR7C1 is a novel marker for colon CICs and can be a target of potent CIC-targeting immunotherapy. Clin Cancer Res; 22(13); 3298-309. ©2016 AACR.</abstract><cop>United States</cop><pmid>26861454</pmid><doi>10.1158/1078-0432.CCR-15-1709</doi><tpages>12</tpages><oa>free_for_read</oa></addata></record>
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subjects Adenocarcinoma - immunology
Adenocarcinoma - pathology
Adenocarcinoma - therapy
Animals
Biomarkers, Tumor - biosynthesis
Biomarkers, Tumor - genetics
Biomarkers, Tumor - immunology
Colonic Neoplasms - immunology
Colonic Neoplasms - pathology
Colonic Neoplasms - therapy
HT29 Cells
Humans
Immunotherapy - methods
Mice
Mice, Inbred NOD
Mice, SCID
Neoplastic Stem Cells - immunology
Prognosis
Receptors, Odorant - biosynthesis
Receptors, Odorant - genetics
Receptors, Odorant - immunology
RNA Interference
RNA, Small Interfering - genetics
Spheroids, Cellular
T-Lymphocytes, Cytotoxic - immunology
Tumor Cells, Cultured
Xenograft Model Antitumor Assays
title Olfactory Receptor Family 7 Subfamily C Member 1 Is a Novel Marker of Colon Cancer-Initiating Cells and Is a Potent Target of Immunotherapy
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