The tumor microenvironment plays an important role in non-Hodgkin lymphoma (NHL) and the role intratumoral immune cells play in the pathology of lymphoma has been significantly understated. Intratumoral monocytes and macrophages are particularly important and our data demonstrate that intratumoral monocytes in NHL are highly immunosuppressive and support malignant cell growth. In preliminary work, we found that suppressive monocytic cells (SMCs) are abundant within the peripheral blood and tumor microenvironment in lymphoma patients and promote the survival of lymphoma cells. SMCs protect lymphoma cells from chemotherapy-induced cell death and promote lymphoma cell engraftment into severe combined immunodeficient (SCID) mice. Furthermore, we found that SMCs within lymph nodes express immunosuppressive ligands including B7-H1 (PD-L1, CD273), inhibit normal T-cell proliferation and promote the induction of FoxP3+ regulatory T cells. These preliminary studies suggest that SMCs have an effect on both malignant NHL cells and non-malignant intratumoral T-cells. Based on our results, we hypothesize that the intersection between the immune system and the malignant cell in NHL is the SMCs. In this proposal, we plan to understand whether monocytes are specifically recruited to sites of lymphoma and which specific chemokines could be inhibited to prevent SMC migration; how lymphoma cells induce SMCs to support their malignant cell growth and to suppress the host's antitumor immunity; and whether promoting monocyte/macrophage maturation or inhibiting their interaction with other cells, particularly in the presence of monoclonal antibodies, improves their anti-tumor function. Upon completion of this project, we expect to have a greater understanding of the role of monocytes and their progeny in NHL. Collectively our findings are likely to have a major impact by leading to an effective monocyte-directed therapeutic approach for patients with lymphoma.
The monocyte-macrophage system is critical in the host's response to pathogens and inflammation. In lymphoma patients, however, there is a significant population of immunosuppressive monocytic cells present in peripheral blood and lymph nodes that promotes the survival of malignant cells. The proposed studies will provide a comprehensive understanding of the role of suppressive monocytes in lymphoma, allowing us to intervene and modulate monocyte function on multiple levels leading to novel therapeutic approaches for lymphoma patients.
|Link, Brian K (2017) Early Relapse in Follicular Lymphoma: High Risks and High Stakes. J Oncol Pract 13:810-811|
|Ding, Wei; LaPlant, Betsy R; Call, Timothy G et al. (2017) Pembrolizumab in patients with CLL and Richter transformation or with relapsed CLL. Blood 129:3419-3427|
|Ammann, Eric M; Shanafelt, Tait D; Larson, Melissa C et al. (2017) Time to Second-line Treatment and Subsequent Relative Survival in Older Patients With Relapsed Chronic Lymphocytic Leukemia/Small Lymphocytic Lymphoma. Clin Lymphoma Myeloma Leuk 17:e11-e25|
|Wafa, Emad I; Geary, Sean M; Goodman, Jonathan T et al. (2017) The effect of polyanhydride chemistry in particle-based cancer vaccines on the magnitude of the anti-tumor immune response. Acta Biomater 50:417-427|
|Paulus, A; Akhtar, S; Yousaf, H et al. (2017) Waldenstrom macroglobulinemia cells devoid of BTKC481S or CXCR4WHIM-like mutations acquire resistance to ibrutinib through upregulation of Bcl-2 and AKT resulting in vulnerability towards venetoclax or MK2206 treatment. Blood Cancer J 7:e565|
|Tanaka, Yoshimasa; Iwasaki, Masashi; Murata-Hirai, Kaoru et al. (2017) Anti-Tumor Activity and Immunotherapeutic Potential of a Bisphosphonate Prodrug. Sci Rep 7:5987|
|Wang, Xueju; Dasari, Surendra; Nowakowski, Grzegorz S et al. (2017) Retinoic acid receptor alpha drives cell cycle progression and is associated with increased sensitivity to retinoids in T-cell lymphoma. Oncotarget 8:26245-26255|
|Scott, David W; Abrisqueta, Pau; Wright, George W et al. (2017) New Molecular Assay for the Proliferation Signature in Mantle Cell Lymphoma Applicable to Formalin-Fixed Paraffin-Embedded Biopsies. J Clin Oncol 35:1668-1677|
|Tracy, S I; Maurer, M J; Witzig, T E et al. (2017) Vitamin D insufficiency is associated with an increased risk of early clinical failure in follicular lymphoma. Blood Cancer J 7:e595|
|Law, Philip J; Berndt, Sonja I; Speedy, Helen E et al. (2017) Genome-wide association analysis implicates dysregulation of immunity genes in chronic lymphocytic leukaemia. Nat Commun 8:14175|
Showing the most recent 10 out of 337 publications