Leukemia is the most common malignancy in childhood. Despite improved outcomes with combination chemotherapy regimens, significant challenges remain in the treatment of leukemia, especially in patients suffering from relapse or central nervous system (CNS)-positive disease. The bone marrow and CNS serve as sanctuary sites for leukemic cells during active chemotherapy, which can then relapse and spread to other organs. In particular, T-cell ALL (T-ALL), a sub-type of acute lymphoblastic leukemia (ALL), is an aggressive leukemia with a propensity to infiltrate the CNS. For these patients, new directions in the treatment options need to be explored. Approximately 60% of human T-ALL harbors a constitutively active protein, the Intracellular Domain of Notch1 (ICN1). Recently, in collaboration with Dr. Lan Zhou, we have established a disease model in which T-ALL harboring ICN1 mutation can be followed from pre-leukemia to full-blown leukemia in live mice. In collaboration with Dr. Letterio, the Huang lab have identified another signaling protein, Cdk5, as being important in the biology of leukemic cells and activated lymphocytes. Neither the contribution of Cdk5 to ICN1-induced T-ALL development, nor the role of Cdk5 as a therapeutic target in ALL has been explored. Here, we have assembled a team of scientists to study how Cdk5 affects ICN1-induced T-ALL tumorigenesis in the marrow and during CNS infiltration. We will study T-ALL development and their CNS seeding capacity by modulating Cdk5 activity in pre-leukemic lymphoblasts using lineage-specific Cdk5 genetic knockout strategies. A combination of cellular and molecular biology, immunology and application of our unique intravital two-photon microscopy capability - which allows the detection of dynamic individual pre- leukemic and leukemic cell behavior in the bone marrow and CNS of live mice - will be used to address these important questions. Coupled with drugs currently being tested against Cdk5 in Phase-I clinical trials, our investigations offer a new direction in the development of novel biological agents or immune-mediated therapies against T-ALL and CNS leukemia.

Public Health Relevance

T cell-lineage leukemia is a hematologic malignancy with a higher rate of chemo-resistance and central nervous system involvement than B cell-lineage leukemia. This pilot project utilizes lineage-specific molecular targeting mouse models and cutting-edge high-resolution single-cell live animal imaging technology to address the critical question of how Cdk5, a novel molecular target in lymphocytes whose inhibitors are currently being evaluated in Phase I and Phase II cancer clinical trials, influences the development and metastasis of acute T-lymphoblastic leukemia in the bone marrow and the central nervous system. Success in this new area of research will chart a new course in the development of novel therapies against T-cell leukemia.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Exploratory/Developmental Grants (R21)
Project #
1R21CA181875-01A1
Application #
8802979
Study Section
Special Emphasis Panel (ZCA1)
Program Officer
Jhappan, Chamelli
Project Start
2015-05-07
Project End
2017-04-30
Budget Start
2015-05-07
Budget End
2016-04-30
Support Year
1
Fiscal Year
2015
Total Cost
Indirect Cost
Name
Case Western Reserve University
Department
Pediatrics
Type
Schools of Medicine
DUNS #
077758407
City
Cleveland
State
OH
Country
United States
Zip Code
44106
Benson, Bryan L; Li, Lucy; Myers, Jay T et al. (2018) Biomimetic post-capillary venule expansions for leukocyte adhesion studies. Sci Rep 8:9328
Zhang, Mei; Chun, Liane; Sandoval, Victor et al. (2018) Systemic administration of ?-glucan of 200 kDa modulates melanoma microenvironment and suppresses metastatic cancer. Oncoimmunology 7:e1387347
Allen, Frederick; Bobanga, Iuliana D; Rauhe, Peter et al. (2018) CCL3 augments tumor rejection and enhances CD8+ T cell infiltration through NK and CD103+ dendritic cell recruitment via IFN?. Oncoimmunology 7:e1393598
Allen, Frederick; Rauhe, Peter; Askew, David et al. (2017) CCL3 Enhances Antitumor Immune Priming in the Lymph Node via IFN? with Dependency on Natural Killer Cells. Front Immunol 8:1390
Dorand, R Dixon; Petrosiute, Agne; Huang, Alex Y (2017) Multifactorial regulators of tumor programmed death-ligand 1 (PD-L1) response. Transl Cancer Res 6:S1451-S1454
Shukla, Sourabh; Dorand, R Dixon; Myers, Jay T et al. (2016) Multiple Administrations of Viral Nanoparticles Alter in Vivo Behavior-Insights from Intravital Microscopy. ACS Biomater Sci Eng 2:829-837
Dorand, R Dixon; Nthale, Joseph; Myers, Jay T et al. (2016) Cdk5 disruption attenuates tumor PD-L1 expression and promotes antitumor immunity. Science 353:399-403