| Differential Expression of Intracellular and Extracellular CB(2) Cannabinoid Receptor Protein by Human Peripheral Blood Leukocytes. | |
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MedLine Citation:
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PMID: 23299999 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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mRNA encoding for the CB(2) cannabinoid receptor is expressed by many subsets of human peripheral blood leukocytes (PBL), but little is known about the resulting protein expression and function. Employing clones from the A549 and 293T cell lines that were constructed to express both full-length human CB(2) and GFP, we developed a flow cytometry assay for characterizing CB(2) protein expression. A monoclonal antibody directed against human CB(2) selectively stained the surface of transduced but not parental cell lines. When cells were fixed and permeabilized, imaging flow cytometry identified large stores of intracellular protein. Total cellular staining for CB(2) corresponded closely with the level of GFP expression. When exposed to Δ(9)-tetrahydrocannabinol, CB(2)-expressing cells internalized cell surface CB(2) receptors in a time- and dose-dependent manner. Applying these approaches to human PBL, CB(2) protein was identified on the surface of human B cells but not on T cells or monocytes. In contrast, when PBL were fixed and permeabilized, intracellular CB(2) expression was readily detected in all three subsets by both conventional and imaging flow cytometry. Similar to the protein expression pattern observed in fixed and permeabilized PBL, purified B cells, T cells, and monocytes expressed relatively equal levels of CB(2) mRNA by quantitative real-time RT-PCR. Our findings confirm that human PBL express CB(2) protein but that its distribution is predominantly intracellular with only B cells expressing CB(2) protein at the extracellular membrane. The differential role of intracellular and extracellular CB(2) receptors in mediating ligand signaling and immune function remains to be determined. |
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Authors:
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Julie T Castaneda; Airi Harui; Sylvia M Kiertscher; Jeffrey D Roth; Michael D Roth |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2013-1-10 |
Journal Detail:
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Title: Journal of neuroimmune pharmacology : the official journal of the Society on NeuroImmune Pharmacology Volume: - ISSN: 1557-1904 ISO Abbreviation: J Neuroimmune Pharmacol Publication Date: 2013 Jan |
Date Detail:
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Created Date: 2013-1-9 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101256586 Medline TA: J Neuroimmune Pharmacol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Division of Pulmonary and Critical Care Medicine, Department of Medicine, CHS 37-131, David Geffen School of Medicine at UCLA, Los Angeles, CA, 90095-1690, USA. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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