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Identification, characterization, and function of a novel oncogene: the peripheral cannabinoid receptor Cb2
Meritxell Alberich Jorda1, Nazik Rayman, Peter Valk
1Department of Hematology, Erasmus Medical Center, the Netherlands.
Annals of the New York Academy of Sciences
|June 12, 2003
Summary
Researchers identified the cannabinoid receptor 2 (CB2) as a potential proto-oncogene in murine leukemias. CB2 overexpression blocks myeloid differentiation and enhances cell migration, suggesting its role in human acute myeloid leukemia (AML).
Area of Science:
- Molecular Biology
- Oncology
- Immunology
Background:
- Retroviral insertional mutagenesis identified a novel common virus integration site (cVIS), Evi11, in murine leukemias.
- The gene Cb2, encoding the peripheral cannabinoid receptor, is located in this region and is a potential proto-oncogene.
Purpose of the Study:
- To investigate the role of Cb2 in murine leukemias and its potential involvement in human acute myeloid leukemia (AML).
- To explore the function of Cb2, a G protein-coupled receptor (GPCR), normally expressed on B lymphocytes.
Main Methods:
- Retroviral insertional mutagenesis in mice.
- Transwell migration assays using 2-arachidonoylglycerol (2-AG).
- Analysis of Cb2 expression and function in murine myeloid precursor cells and human AML samples.
Main Results:
- Cb2 overexpression in murine myeloid precursor cells blocked neutrophilic differentiation, a hallmark of myeloid leukemia.
- Cb2-expressing cells showed significant migration upon stimulation with 2-AG.
- Functional Cb2 receptors were not detected on normal murine bone marrow precursor cells.
- CB2 mRNA transcripts were found in human AML samples, with 2-AG-induced migration observed in one case.
Conclusions:
- The identified cVIS, Evi11, encodes a murine oncoprotein, Cb2.
- Human CB2 may play a role in the pathogenesis of certain cases of human AML.
- CB2's role in cell differentiation and migration suggests its oncogenic potential.