Inventors:
Suzanne L. Topalian - Brookeville MD, US
Florence Depontieu - Lyon, FR
Donald Hunt - Charlottesville VA, US
Jeffrey Shabanowitz - Charlottesville VA, US
Jie Qian - Bridgewater NJ, US
Victor Engelhard - Crozet VA, US
Angela Zaring - charlottesviille VA, US
Assignee:
UNIVERSITY OF VIRGINIA PATENT FOUNDATION - Charlottesville VA
THE JOHNS HOPKINS UNIVERSITY - Baltimore MD
International Classification:
A61K 39/00, A61K 35/12, C07K 16/30, A61P 35/00, A61P 35/04, A61P 37/04, C12N 5/0784, C07K 7/08, C07K 14/74, C07K 14/47, G01N 33/566, C07K 7/06, C12N 5/0783
US Classification:
4241851, 530328, 4242771, 5303879, 5303873, 435375, 435325, 530326, 530327, 530405, 530325, 530324, 436501, 435 71
Abstract:
We characterized a total of 175 HLA-DR-associated phosphopeptides using sequential affinity isolation, biochemical enrichment, mass spectrometric sequencing and comparative analysis. Many were derived from source proteins which may have roles in cancer development, growth and metastasis. Most were expressed exclusively by either melanomas or transformed B cells, suggesting the potential to define cell type-specific phosphatome “fingerprints”. We generated HLA-DRβ1*0101-restricted CD4T cells specific for a phospho-MART-1 peptide identified in two melanoma cell lines. These T cells showed specificity for phosphopeptide-pulsed antigen presenting cells as well as for intact melanoma cells. MHC II-restricted phosphopeptides recognizable by human CD4T cells are potential targets for cancer immunotherapy.