Browsing by Author "Boyiadzis, Michael"

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    DPP4+ exosomes in AML patients’ plasma suppress proliferation of hematopoietic progenitor cells
    (Springer Nature, 2021) Namburi, Swathi; Broxmeyer, Hal E.; Hong, Chang-Sook; Whiteside, Theresa L.; Boyiadzis, Michael; Microbiology and Immunology, School of Medicine
    Mechanisms by which acute myeloid leukemia (AML) interferes with normal hematopoiesis are under intense investigation. Emerging evidence suggests that exosomes produced by leukemia blasts suppress hematopoiesis. Exosomes isolated from AML patients' plasma at diagnosis significantly and dose-dependently suppressed colony formation of normal hematopoietic progenitor cells (HPC). Levels of HPC suppression mediated by exosomes of AML patients who achieved complete remission (CR) were significantly decreased compared to those observed at AML diagnosis. Exosomes from plasma of patients who had achieved CR but with incomplete cell count recovery (CRi) after chemotherapy suppressed in vitro colony formation as effectively as did exosomes obtained at AML diagnosis. Dipeptidylpeptidase4 (DPP4/CD26), a serine protease that cleaves select penultimate amino acids of various proteins, has been previously implicated in the regulation of hematopoiesis. DPP4 was carried by exosomes from AML plasma or leukemia cell lines. Leukemia exosomes which suppressed HSC colony formation had markedly higher DPP4 functional activity than that detected in the exosomes of normal donors. Pharmacological inhibition of DPP4 activity in AML exosomes reversed the effects of exosome-mediated myelosuppression. Reversing the negative effects of exosomes on AML hematopoiesis, and thus improving cell count recovery, might emerge as a new therapeutic approach to AML.
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    The Society for Immunotherapy of Cancer consensus statement on immunotherapy for the treatment of hematologic malignancies: multiple myeloma, lymphoma, and acute leukemia
    (BioMed Central, 2016-12-20) Boyiadzis, Michael; Bishop, Michael R.; Abonour, Rafat; Anderson, Kenneth C.; Ansell, Stephen M.; Avigan, David; Barbarotta, Lisa; Barrett, Austin John; Van Besien, Koen; Bergsagel, Leif; Borrello, Ivan; Brody, Joshua; Brufsky, Jill; Cairo, Mitchell; Chari, Ajai; Cohen, Adam; Cortes, Jorge; Forman, Stephen J.; Friedberg, Jonathan W.; Fuchs, Ephraim J.; Gore, Steven D.; Jagannath, Sundar; Kahl, Brad S; Kline, Justin; Kochenderfer, James N.; Kwak, Larry W.; Levy, Ronald; de Lima, Marcos; Litzow, Mark R.; Mahindra, Anuj; Miller, Jeffrey; Munshi, Nikhil C.; Orlowski, Robert Z.; Pagel, John M.; Porter, David L.; Russell, Stephen J.; Schwartz, Karl; Shipp, Margaret A.; Siegel, David; Stone, Richard M.; Tallman, Martin S.; Timmerman, John M.; Van Rhee, Frits; Waller, Edmund K.; Welsh, Ann; Werner, Michael; Wiernik, Peter H.; Dhodapkar, Madhav V.; Department of Medicine, IU School of Medicine
    Increasing knowledge concerning the biology of hematologic malignancies as well as the role of the immune system in the control of these diseases has led to the development and approval of immunotherapies that are resulting in impressive clinical responses. Therefore, the Society for Immunotherapy of Cancer (SITC) convened a hematologic malignancy Cancer Immunotherapy Guidelines panel consisting of physicians, nurses, patient advocates, and patients to develop consensus recommendations for the clinical application of immunotherapy for patients with multiple myeloma, lymphoma, and acute leukemia. These recommendations were developed following the previously established process based on the Institute of Medicine’s clinical practice guidelines. In doing so, a systematic literature search was performed for high-impact studies from 2004 to 2014 and was supplemented with further literature as identified by the panel. The consensus panel met in December of 2014 with the goal to generate consensus recommendations for the clinical use of immunotherapy in patients with hematologic malignancies. During this meeting, consensus panel voting along with discussion were used to rate and review the strength of the supporting evidence from the literature search. These consensus recommendations focus on issues related to patient selection, toxicity management, clinical endpoints, and the sequencing or combination of therapies. Overall, immunotherapy is rapidly emerging as an effective therapeutic strategy for the management of hematologic malignances. Evidence-based consensus recommendations for its clinical application are provided and will be updated as the field evolves.