NR4A1-mediated apoptosis suppresses lymphomagenesis and is associated with a favorable cancer-specific survival in patients with aggressive B-cell lymphomas.

Abstract

NR4A1 (Nur77) and NR4A3 (Nor-1) function as tumor suppressor genes as demonstrated by the rapid development of acute myeloid leukemia in the NR4A1 and NR4A3 knockout mouse. The aim of our study was to investigate NR4A1 and NR4A3 expression and function in lymphoid malignancies. We found a vastly reduced expression of NR4A1 and NR4A3 in chronic lymphocytic B-cell leukemia (71%), in follicular lymphoma (FL, 70%), and in diffuse large B-cell lymphoma (DLBCL, 74%). In aggressive lymphomas (DLBCL and FL grade 3), low NR4A1 expression was significantly associated with a non-germinal center B-cell subtype and with poor overall survival. To investigate the function of NR4A1 in lymphomas, we overexpressed NR4A1 in several lymphoma cell lines. Overexpression of NR4A1 led to a higher proportion of lymphoma cells undergoing apoptosis. To test the tumor suppressor function of NR4A1 in vivo, the stable lentiviral-transduced SuDHL4 lymphoma cell line harboring an inducible NR4A1 construct was further investigated in xenografts. Induction of NR4A1 abrogated tumor growth in the NSG mice, in contrast to vector controls, which formed massive tumors. Our data suggest that NR4A1 has proapoptotic functions in aggressive lymphoma cells and define NR4A1 as a novel gene with tumor suppressor properties involved in lymphomagenesis.

• Authors: Alexander J A Deutsch, Beate Rinner, Kerstin Wenzl, Martin Pichler, Katharina Troppan, Elisabeth Steinbauer, Daniela Schwarzenbacher, Sonja Reitter, Julia Feichtinger, Sascha Tierling, Andreas Prokesch, Marcel Scheideler, Anne Krogsdam, Gerhard G Thallinger, Helmut Schaider, Christine Beham-Schmid, Peter Neumeister
• Journal: Blood (Blood) Vol. 123 Issue 15 Pg. 2367-77 (Apr 10 2014) ISSN: 1528-0020 [Electronic] United States
• PMID: 24553175 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• DNA-Binding Proteins
• NR4A1 protein, human
• NR4A3 protein, human
• Nuclear Receptor Subfamily 4, Group A, Member 1
• Receptors, Steroid
• Receptors, Thyroid Hormone

Topics

• Animals
• Apoptosis (genetics)
• Blotting, Western
• Cell Line, Tumor
• DNA-Binding Proteins (genetics)
• Heterografts
• Humans
• Immunohistochemistry
• Kaplan-Meier Estimate
• Lymphoma, B-Cell (genetics, mortality)
• Mice
• Mice, Inbred NOD
• Mice, SCID
• Nuclear Receptor Subfamily 4, Group A, Member 1 (genetics)
• Proportional Hazards Models
• Receptors, Steroid (genetics)
• Receptors, Thyroid Hormone (genetics)