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

Melenhorst, J. Joseph, Scheinberg, Phillip, Chattopadhyay, Pratip K., Gostick, Emma, Ladell, Kristin Ingrid ORCID:, Roederer, Mario, Hensel, Nancy F., Douek, Daniel C., Barrett, A. John and Price, David ORCID: 2009. High avidity myeloid leukemia-associated antigen-specific CD8+ T cells preferentially reside in the bone marrow. Blood 113 (10) , pp. 2238-2244. 10.1182/blood-2008-04-151969

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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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Systems Immunity Research Institute (SIURI)
Subjects: Q Science > QR Microbiology > QR180 Immunology
R Medicine > RC Internal medicine > RC0254 Neoplasms. Tumors. Oncology (including Cancer)
Publisher: American Society of Hematology
ISSN: 0006-4971
Last Modified: 06 Nov 2022 13:51

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