High avidity myeloid leukemia-associated antigen-specific CD8+ T cells preferentially reside in the bone marrow Export

@article{citeulike:6003575, abstract = {The activity of allogeneic CD8+ T cells specific for leukemia-associated antigens (LAAs) is thought to mediate, at least in part, the curative effects of hematopoietic stem cell transplantation (HSCT) in myeloid malignancies. However, the identity and nature of clinically relevant LAA-specific CD8+ T-cell populations have proven difficult to define. Here, we used a combination of coreceptor-mutated peptide-major histocompatibility complex class I (pMHCI) tetramers and polychromatic flow cytometry to examine the avidity profiles, phenotypic characteristics, and anatomical distribution of HLA A*0201-restricted CD8+ T-cell populations specific for LAAs that are over-expressed in myeloid leukemias. Remarkably, LAA-specific CD8+ T-cell populations, regardless of fine specificity, were confined almost exclusively to the bone marrow; in contrast, CD8+ T-cell populations specific for the HLA A*0201-restricted cytomegalovirus (CMV) pp65495-503 epitope were phenotypically distinct and evenly distributed between bone marrow and peripheral blood. Furthermore, bone marrow-resident LAA-specific CD8+ T cells frequently engaged cognate antigen with high avidity; notably, this was the case in all tested bone marrow samples derived from patients who achieved clinical remission after HSCT. These data suggest that concomitant examination of bone marrow specimens in patients with myeloid leukemias might yield more definitive information in the search for immunologic prognosticators of clinical outcome. 10.1182/blood-2008-04-151969}, author = {Melenhorst, Joseph J. and Scheinberg, Phillip and Chattopadhyay, Pratip K. and Gostick, Emma and Ladell, Kristin and Roederer, Mario and Hensel, Nancy F. and Douek, Daniel C. and Barrett, A. John and Price, David A.}, citeulike-article-id = {6003575}, citeulike-linkout-0 = {http://dx.doi.org/10.1182/blood-2008-04-151969}, citeulike-linkout-1 = {http://bloodjournal.hematologylibrary.org/content/113/10/2238.abstract}, citeulike-linkout-2 = {http://bloodjournal.hematologylibrary.org/content/113/10/2238.full.pdf}, citeulike-linkout-3 = {http://view.ncbi.nlm.nih.gov/pubmed/18997173}, citeulike-linkout-4 = {http://www.hubmed.org/display.cgi?uids=18997173}, day = {5}, doi = {10.1182/blood-2008-04-151969}, journal = {Blood}, keywords = {aml, ctl}, month = {March}, number = {10}, pages = {2238--2244}, posted-at = {2009-10-25 01:29:15}, priority = {2}, title = {High avidity myeloid leukemia-associated antigen-specific CD8+ T cells preferentially reside in the bone marrow}, url = {http://dx.doi.org/10.1182/blood-2008-04-151969}, volume = {113}, year = {2009} }

TY - JOUR ID - citeulike:6003575 L3 - citeulike-article-id:6003575 N2 - The activity of allogeneic CD8+ T cells specific for leukemia-associated antigens (LAAs) is thought to mediate, at least in part, the curative effects of hematopoietic stem cell transplantation (HSCT) in myeloid malignancies. However, the identity and nature of clinically relevant LAA-specific CD8+ T-cell populations have proven difficult to define. Here, we used a combination of coreceptor-mutated peptide-major histocompatibility complex class I (pMHCI) tetramers and polychromatic flow cytometry to examine the avidity profiles, phenotypic characteristics, and anatomical distribution of HLA A*0201-restricted CD8+ T-cell populations specific for LAAs that are over-expressed in myeloid leukemias. Remarkably, LAA-specific CD8+ T-cell populations, regardless of fine specificity, were confined almost exclusively to the bone marrow; in contrast, CD8+ T-cell populations specific for the HLA A*0201-restricted cytomegalovirus (CMV) pp65495-503 epitope were phenotypically distinct and evenly distributed between bone marrow and peripheral blood. Furthermore, bone marrow-resident LAA-specific CD8+ T cells frequently engaged cognate antigen with high avidity; notably, this was the case in all tested bone marrow samples derived from patients who achieved clinical remission after HSCT. These data suggest that concomitant examination of bone marrow specimens in patients with myeloid leukemias might yield more definitive information in the search for immunologic prognosticators of clinical outcome. 10.1182/blood-2008-04-151969 IS - 10 JF - Blood EP - 2244 TI - High avidity myeloid leukemia-associated antigen-specific CD8+ T cells preferentially reside in the bone marrow VL - 113 SP - 2238 KW - aml KW - ctl AU - Melenhorst, Joseph AU - Scheinberg, Phillip AU - Chattopadhyay, Pratip AU - Gostick, Emma AU - Ladell, Kristin AU - Roederer, Mario AU - Hensel, Nancy AU - Douek, Daniel AU - Barrett, John AU - Price, David PY - 2009/03/05/ UR - http://dx.doi.org/10.1182/blood-2008-04-151969 ER -