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Rozanov DV, Rozanov ND, Chiotti KE, Reddy A, Wilmarth PA, David LL, Cha SW, Woo S, Pevzner P, Bafna V, Burrows GG, Rantala JK, Levin T, Anur P, Johnson-Camacho K, Tabatabaei S, Munson DJ, Bruno TC, Slansky JE, Kappler JW, Hirano N, Boegel S, Fox BA, Egelston C, Simons DL, Jimenez G, Lee PP, Gray JW, Spellman PT. MHC class I loaded ligands from breast cancer cell lines: A potential HLA-I-typed antigen collection. J Proteomics 2018; 176:13-23. [PMID: 29331515 DOI: 10.1016/j.jprot.2018.01.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Revised: 12/01/2017] [Accepted: 01/04/2018] [Indexed: 12/30/2022]
Abstract
To build a catalog of peptides presented by breast cancer cells, we undertook systematic MHC class I immunoprecipitation followed by elution of MHC class I-loaded peptides in breast cancer cells. We determined the sequence of 3196 MHC class I ligands representing 1921 proteins from a panel of 20 breast cancer cell lines. After removing duplicate peptides, i.e., the same peptide eluted from more than one cell line, the total number of unique peptides was 2740. Of the unique peptides eluted, more than 1750 had been previously identified, and of these, sixteen have been shown to be immunogenic. Importantly, half of these immunogenic peptides were shared between different breast cancer cell lines. MHC class I binding probability was used to plot the distribution of the eluted peptides in accordance with the binding score for each breast cancer cell line. We also determined that the tested breast cancer cells presented 89 mutation-containing peptides and peptides derived from aberrantly translated genes, 7 of which were shared between four or two different cell lines. Overall, the high throughput identification of MHC class I-loaded peptides is an effective strategy for systematic characterization of cancer peptides, and could be employed for design of multi-peptide anticancer vaccines. SIGNIFICANCE By employing proteomic analyses of eluted peptides from breast cancer cells, the current study has built an initial HLA-I-typed antigen collection for breast cancer research. It was also determined that immunogenic epitopes can be identified using established cell lines and that shared immunogenic peptides can be found in different cancer types such as breast cancer and leukemia. Importantly, out of 3196 eluted peptides that included duplicate peptides in different cells 89 peptides either contained mutation in their sequence or were derived from aberrant translation suggesting that mutation-containing epitopes are on the order of 2-3% in breast cancer cells. Finally, our results suggest that interfering with MHC class I function is one of the mechanisms of how tumor cells escape immune system attack.
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Affiliation(s)
- Dmitri V Rozanov
- Department of Molecular and Medical Genetics, Oregon Health and Science University, Portland, OR, United States.
| | | | - Kami E Chiotti
- Department of Molecular and Medical Genetics, Oregon Health and Science University, Portland, OR, United States
| | - Ashok Reddy
- Proteomics Shared Resource, Oregon Health and Science University, Portland, OR, United States
| | - Phillip A Wilmarth
- Proteomics Shared Resource, Oregon Health and Science University, Portland, OR, United States
| | - Larry L David
- Proteomics Shared Resource, Oregon Health and Science University, Portland, OR, United States
| | - Seung W Cha
- Electrical and Computer Engineering, University of California, San Diego, CA, United States
| | - Sunghee Woo
- School of Medicine, Johns Hopkins University, Baltimore, MD, United States
| | - Pavel Pevzner
- The NIH Center for Computational Mass Spectrometry, University of California, San Diego, San Diego, CA, United States
| | - Vineet Bafna
- Computer Science & Engineering, University of California, San Diego, CA, United States
| | - Gregory G Burrows
- Neurology and Biochemistry & Molecular Biology, Oregon Health and Science University, Portland, OR, United States
| | | | - Trevor Levin
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, OR, United States
| | - Pavana Anur
- Department of Molecular and Medical Genetics, Oregon Health and Science University, Portland, OR, United States
| | - Katie Johnson-Camacho
- Department of Molecular and Medical Genetics, Oregon Health and Science University, Portland, OR, United States
| | - Shaadi Tabatabaei
- Department of Molecular and Medical Genetics, Oregon Health and Science University, Portland, OR, United States
| | - Daniel J Munson
- Department of Immunology & Microbiology, University of Colorado, Denver, CO, United States
| | - Tullia C Bruno
- Department of Immunology, University of Pittsburgh, Pittsburgh, PA, United States
| | - Jill E Slansky
- Department of Immunology & Microbiology, University of Colorado, Denver, CO, United States
| | - John W Kappler
- National Jewish Medical and Research Center, Denver, CO, United States
| | - Naoto Hirano
- Margaret Cancer Centre, Toronto, Ontario, Canada
| | - Sebastian Boegel
- University Medical Center, Johannes Gutenberg-University, Mainz, Germany
| | - Bernard A Fox
- Laboratory of Molecular and Tumor Immunology, Chiles Research Institute Providence PDX Medical Center, Portland, OR, United States
| | - Colt Egelston
- City of Hope National Medical Center, Duarte, CA, United States
| | - Diana L Simons
- City of Hope National Medical Center, Duarte, CA, United States
| | - Grecia Jimenez
- City of Hope National Medical Center, Duarte, CA, United States
| | - Peter P Lee
- City of Hope National Medical Center, Duarte, CA, United States
| | - Joe W Gray
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, OR, United States; Center for Health & Healing, Oregon Health and Science University, Portland, OR, United States
| | - Paul T Spellman
- Department of Molecular and Medical Genetics, Oregon Health and Science University, Portland, OR, United States
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