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Cancer Cell Biology
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Expression of cannabinoid receptors type 1 and type 2 in non‐Hodgkin lymphoma: Growth inhibition by receptor activation

Kristin Gustafsson

Department of Laboratory Medicine, Division of Pathology, Karolinska Institutet and Karolinska University Hospital Huddinge, F‐46, SE‐14186 Stockholm, Sweden

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Xiao Wang

Department of Laboratory Medicine, Division of Pathology, Karolinska Institutet and Karolinska University Hospital Huddinge, F‐46, SE‐14186 Stockholm, Sweden

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Denise Severa

Department of Laboratory Medicine, Division of Pathology, Karolinska Institutet and Karolinska University Hospital Huddinge, F‐46, SE‐14186 Stockholm, Sweden

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Maeve Eriksson

Department of Laboratory Medicine, Division of Pathology, Karolinska Institutet and Karolinska University Hospital Huddinge, F‐46, SE‐14186 Stockholm, Sweden

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Eva Kimby

Department of Medicine, Division of Hematology, Karolinska Institutet and Karolinska University Hospital Huddinge, SE‐14186 Stockholm, Sweden

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Mats Merup

Department of Medicine, Division of Hematology, Karolinska Institutet and Karolinska University Hospital Huddinge, SE‐14186 Stockholm, Sweden

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Birger Christensson

Department of Laboratory Medicine, Division of Pathology, Karolinska Institutet and Karolinska University Hospital Huddinge, F‐46, SE‐14186 Stockholm, Sweden

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Jenny Flygare

Department of Laboratory Medicine, Division of Pathology, Karolinska Institutet and Karolinska University Hospital Huddinge, F‐46, SE‐14186 Stockholm, Sweden

The last two authors contributed equally to this work.Search for more papers by this author
Birgitta Sander

Corresponding Author

E-mail address:birgitta.sander@ki.se

Department of Laboratory Medicine, Division of Pathology, Karolinska Institutet and Karolinska University Hospital Huddinge, F‐46, SE‐14186 Stockholm, Sweden

The last two authors contributed equally to this work.Fax: +468‐5858‐1020.
Department of Laboratory Medicine, Division of Pathology, Karolinska University Hospital Huddinge, F‐46, SE‐14186 Stockholm, Sweden
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First published: 10 June 2008
Cited by: 25

Fax: +468‐5858‐1020.

Abstract

Endogenous and synthetic cannabinoids exert antiproliferative and proapoptotic effects in various types of cancer and in mantle cell lymphoma (MCL). In this study, we evaluated the expression of cannabinoid receptors type 1 and type 2 (CB1 and CB2) in non‐Hodgkin lymphomas of B cell type (n = 62). A majority of the lymphomas expressed higher mRNA levels of CB1 and/or CB2 as compared to reactive lymphoid tissue. With the exception of MCL, which uniformly overexpresses both CB1 and CB2, the levels of cannabinoid receptors within other lymphoma entities were highly variable, ranging from 0.1 to 224 times the expression in reactive lymph nodes. Low levels of the splice variant CB1a, previously shown to have a different affinity for cannabinoids than CB1, were detected in 44% of the lymphomas, while CB1b expression was not detected. In functional studies using MCL, Burkitt lymphoma (BL), chronic lymphatic leukemia (CLL) and plasma cell leukemia cell lines, the stable anandamide analog R(+)‐methanandamide (R(+)‐MA) induced cell death only in MCL and CLL cells, which overexpressed both cannabinoid receptors, but not in BL. In vivo treatment with R(+)‐MA caused a significant reduction of tumor size and mitotic index in mice xenografted with human MCL. Together, our results suggest that therapies using cannabinoid receptor ligands will have efficiency in reducing tumor burden in malignant lymphoma overexpressing CB1 and CB2. © 2008 Wiley‐Liss, Inc.

Number of times cited: 25

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