Cells in the human body communicate their health status to the immune system by degrading cellular proteins and presenting fragments of each on the cell surface in association class I MHC proteins. Appropriately educated, cytotoxic T-lymphocytes (CTL) (CD8+ T-cells) bind to the class I MHC molecules on the cell surface, sample the protein fragments (peptides) being presented and kill those cells that express new peptides as a result of viral, bacterial and parasitic infection, tissue transplantation and cellulr transformation (cancer). Since dysregulation of cell signaling pathways is one of the hallmarks of cancer, we hypothesized that class I MHC phosphopeptides that result from these pathways should be excellent candidates for use in the immunotherapy of cancer. Class I MHC phosphopeptides identified in preliminary work on leukemia, melanoma, and colorectal cancers elicit pre-existing, central-memory, T-cell-recall responses in multiple, healthy blood donors. Central memory recall responses to phosphopeptide antigens is absent in some leukemia patients and correlates with clinical outcome. The response is restored following allogenic stem cell transplantation. These results suggest strongly that class I MHC phosphopeptides are tumor targets of immune surveillance in humans and, therefore, are likely candidates for immunotherapy of cancer. Three of the discovered phosphopeptides will be the subject of a phase I clinical trial on melanoma later this spring. Proposed here is additional research to complete our studies on melanoma, leukemia, and colorectal cancer and to begin an effort to characterize class I MHC phosphopeptides presented on esophageal, liver and ovarian cancer. Additional research will be conducted to identify the repertoire of altered class I or class II sel-peptides that are induced by prescription drugs or environmental agents and lead to life threatening autoimmune disease. Also proposed is the development novel mass spectrometry technology that will facilitate near complete amino acid sequence coverage of intact therapeutic antibodies and other proteins at the high femtomole level on a chromatographic time scale. This will be accomplished by a combination protein chemical derivatization, changes to existing instrument hardware, enhanced performance of ion-ion chemistry inside the instrument, and modifications to the instrument control software. This approach should accelerate the development of therapeutic antibodies for multiple diseases and also facilitate complete characterization of proteins and protein complexes that contain multiple posttranslational modifications on the same protein molecule.

Public Health Relevance

Proposed here is research; (a) to develop new mass spectrometry instrumentation and methods for the complete sequence analysis of therapeutic antibodies and other intact proteins and (b) to identify class I MHC phosphopeptides that result from dysregulated signal transduction pathways associated with cellular transformation and that stimulate the adaptive immune system to control melanoma, multiple leukemias, plus colorectal, ovarian, liver and esophageal cancer. Characterization of class I and class II MHC peptides that trigger prescription-drug induced and life threatening autoimmune diseases is another objective of the proposed research.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI033993-23
Application #
9180663
Study Section
Enabling Bioanalytical and Imaging Technologies Study Section (EBIT)
Program Officer
Gondre-Lewis, Timothy A
Project Start
1999-09-20
Project End
2017-11-30
Budget Start
2016-12-01
Budget End
2017-11-30
Support Year
23
Fiscal Year
2017
Total Cost
Indirect Cost
Name
University of Virginia
Department
Chemistry
Type
Schools of Arts and Sciences
DUNS #
065391526
City
Charlottesville
State
VA
Country
United States
Zip Code
22904
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Anderson, Lissa C; English, A Michelle; Wang, Weihan et al. (2015) Protein derivatization and sequential ion/ion reactions to enhance sequence coverage produced by electron transfer dissociation mass spectrometry. Int J Mass Spectrom 377:617-624
Bergmann, Tobias; Moore, Carrie; Sidney, John et al. (2015) The common equine class I molecule Eqca-1*00101 (ELA-A3.1) is characterized by narrow peptide binding and T cell epitope repertoires. Immunogenetics 67:675-89
Metushi, Imir G; Wriston, Amanda; Banerjee, Priyanka et al. (2015) Acyclovir Has Low but Detectable Influence on HLA-B*57:01 Specificity without Inducing Hypersensitivity. PLoS One 10:e0124878
Chen, Shuming; Li, Yili; Depontieu, Florence R et al. (2013) Structure-based design of altered MHC class II-restricted peptide ligands with heterogeneous immunogenicity. J Immunol 191:5097-106
Cobbold, Mark; De La Peña, Hugo; Norris, Andrew et al. (2013) MHC class I-associated phosphopeptides are the targets of memory-like immunity in leukemia. Sci Transl Med 5:203ra125

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