This project is based on our findings that high expression of Human Germinal center Associated Lymphoma (HGAL) - a new gene that we cloned and characterized - is an independent predictor of prolonged survival of diffuse large B cell lymphoma (DLBCL) and Hodgkin's disease (HD) patients. Recently, we demonstrated that HGAL mediates IL-6-induced inhibition of germinal center (GC) B-cell migration. We demonstrated that IL-6 induces Lyn-mediated phosphorylation of the HGAL C-terminal tyrosine and causes HGAL relocalization to podosome-like structures and spike-like filopodia. We showed interactions between endogenous HGAL and myosin II and delineated HGAL domains responsible for the interaction. We provided evidence that HGAL phosphorylation results in increased interaction with the myosin II and demonstrated that knockdown of endogenous HGAL ameliorates the inhibitory effects of the IL-6 on cell migration. Taken together, these results identified HGAL as a physiological mediator of IL-6 effects on lymphocyte migration and suggest that HGAL expression in GC-derived lymphomas may limit tumor dissemination and predispose to better clinical outcome. However, despite the marked progress in identifying HGAL role in cellular processes, the precise mechanisms of HGAL-mediated inhibition of cell migration and consequent predisposition to better clinical outcome of tumors expressing HGAL are presently unknown. Our preliminary data demonstrates that HGAL may affect cell motility by interacting with myosin II and/or by increasing RhoA activity. However, these effects need to be further investigated. In this project we will: 1) Determine effects of HGAL on myosin II function;2) Determine effects of HGAL on a member of the small Rho GTPase family - RhoA protein and its effectors;3) Determine the role of HGAL myristoylation and palmytoylation on its inhibitory effects on cell motility;and 4) Determine the effects of HGAL expression in transgenic mice model on lymphocyte differentiation, maturation, motility and lymphomagenesis. These studies will expand our knowledge on biology of the GC lymphocytes, with specific emphasis on lymphocyte motility and migration. Furthermore, these studies will reveal potentially new mechanisms regulating dissemination and progression of lymphoid tumors. These mechanistic studies may provide novel approaches for new therapeutic.

Public Health Relevance

Ability to predict patients'outcome at the time of diagnosis is of paramount significance. We have previously cloned a new gene - HGAL that was demonstrated to be an important prognostic biomarker in Hodgkin's and non-Hodgkin's lymphomas. We have shown previously that HGAL inhibit tumors migration and dissemination. Herein we will investigate molecular mechanisms of HGAL-induced inhibition of cell migration. These findings will not only elucidate the mechanisms of tumor dissemination but also will identify a new potential molecular target for novel therapeutic intervention.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
5R01CA109335-05
Application #
7893249
Study Section
Tumor Microenvironment Study Section (TME)
Program Officer
Mufson, R Allan
Project Start
2004-07-01
Project End
2014-05-31
Budget Start
2010-06-01
Budget End
2011-05-31
Support Year
5
Fiscal Year
2010
Total Cost
$250,696
Indirect Cost
Name
University of Miami School of Medicine
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
052780918
City
Coral Gables
State
FL
Country
United States
Zip Code
33146
Misiewicz-Krzeminska, Irena; Sarasquete, María E; Vicente-Dueñas, Carolina et al. (2016) Post-transcriptional Modifications Contribute to the Upregulation of Cyclin D2 in Multiple Myeloma. Clin Cancer Res 22:207-17
Auer, Franziska; Ingenhag, Deborah; Bhatia, Sanil et al. (2016) GEMMs addressing Pax5 loss-of-function in childhood pB-ALL. Eur J Med Genet 59:166-72
Block, Keith I; Gyllenhaal, Charlotte; Lowe, Leroy et al. (2015) Designing a broad-spectrum integrative approach for cancer prevention and treatment. Semin Cancer Biol 35 Suppl:S276-S304
Feitelson, Mark A; Arzumanyan, Alla; Kulathinal, Rob J et al. (2015) Sustained proliferation in cancer: Mechanisms and novel therapeutic targets. Semin Cancer Biol 35 Suppl:S25-S54
Brown, Geoffrey; Sanchez-Garcia, Isidro (2015) Is lineage decision-making restricted during tumoral reprograming of haematopoietic stem cells? Oncotarget 6:43326-41
Bhatt, Shruti; Matthews, Julie; Parvin, Salma et al. (2015) Direct and immune-mediated cytotoxicity of interleukin-21 contributes to antitumor effects in mantle cell lymphoma. Blood 126:1555-64
Vicente-Dueñas, Carolina; Hauer, Julia; Ruiz-Roca, Lucía et al. (2015) Tumoral stem cell reprogramming as a driver of cancer: Theory, biological models, implications in cancer therapy. Semin Cancer Biol 32:3-9
Hosein, Peter J; Sandoval-Sus, Jose D; Goodman, Deborah et al. (2015) Updated survival analysis of two sequential prospective trials of R-MACLO-IVAM followed by maintenance for newly diagnosed mantle cell lymphoma. Am J Hematol 90:E111-6
Lossos, Izidore S; Fabregas, Jesus C; Koru-Sengul, Tulay et al. (2015) Phase II study of (90)Y Ibritumomab tiuxetan (Zevalin) in patients with previously untreated marginal zone lymphoma. Leuk Lymphoma 56:1750-5
Lu, Xiaoqing; Sicard, Renaud; Jiang, Xiaoyu et al. (2015) HGAL localization to cell membrane regulates B-cell receptor signaling. Blood 125:649-57

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