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JORDÀ, MERITXELL ALBERICH; RAYMAN, NAZIK; VALK, PETER; De WEE, EVA; DELWEL, RUUD
Annals of the New York Academy of Sciences, 05/2003, Letnik: 996, Številka: 1Journal Article
: By means of retroviral insertional mutagenesis, we identified a novel common virus integration site (cVIS) (Evi11) in murine leukemias, and demonstrated that Cb2, encoding the peripheral cannabinoid receptor, is the potential proto‐oncogene located in that region. Cb2 is a 7‐transmembrane G protein‐coupled receptor (GPCR), which is normally expressed on B lymphocytes. Using transwell assays we observed strong migration of Cb2‐expressing cells upon stimulation with 2‐arachidonoylglycerol (2‐AG), a potent endocannabinoid. Overexpression of Cb2 receptor on murine myeloid precursor cells causes a block of neutrophilic differentiation, a major characteristic of myeloid leukemia. Intriguingly, we could not detect functional Cb2 receptors on normal murine bone marrow precursor cells. Furthermore, analysis of human acute myeloid leukemia (AML) samples revealed the presence of CB2 mRNA transcripts in several cases. Furthermore, migration could be induced by 2‐AG when analyzed in one of the patient samples. Our data suggest that the initially identified cVIS, Evi11, encodes for a murine onco‐protein and that human CB2 may be involved in certain cases of human AML as well.
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