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- W1036896149 abstract "△9-tetrahydrocannabinol, the major psychoactive cannabinoid of marijuana, modulates immune cells in vivo and in vitro. It is possible that the drug exerts it’s effect either by inserting into and disrupting the cell membrane (nonreceptor mechanism) or by binding to a cannabinoid receptor moiety and thus altering cell function through some form of signal transduction. In the present study, we confirm and extend the findings that mouse and human immune cells express specific cannabinoid binding sites and cannabinoid receptor mRNA. Reverse transcription-polymerase chain reaction analysis showed the presence of receptor mRNA not only in the neuroblastoma cell line (N18TG-2), but also in mouse splenocytes and in cell lines such as NKB61A2 (a mouse natural killer-like), CTLL2 (a mouse IL2-dependent T cell), THP-1 (a human monocytic cell) and Raji (a human B cell) but not in Jurkat (a human T cell). Furthermore, the receptor mRNA was expressed in purified populations of resting splenic T and B lymphocytes but not in resting populations of enriched splenic macrophages. Finally, LPS-stimulated Raji and PMA-stimulated THP-1 human cell lines showed increased levels of the cannabinoid receptor mRNA. These results suggest cannabinoid receptors have biological relevance in lymphoid cells because: receptor mRNA is detected in some resting immune cells but not others and the mRNA increases during cell activation.The major psychoactive component of marijuana, A9-tetrahydrocannabinol (THC), has been shown to modulate human and mouse immune responses both in vitro and in vivo (1,2). A few reports have examined the molecular basis for this drug-induced modulation and suggest that THC suppresses intracellular calcium mobilization during lymphocyte activation (3), modulation of membrane fatty acids in macrophages (4) and lymphocytes (5), suppression of functional IL2 receptors (6), and modulation of cytokine release from macrophages (7).A putative cannabinoid receptor has been identified in neuronal tissues from a variety of mammalian species by in situ hybridization and binding studies (8-10). Recently, a cannabinoid receptor gene was cloned from a rat brain cDNA library and identified as a G protein-coupled receptor (11). Expression of the receptor has been reported in nonneuronal tissues such as the testis (12) and, recently, in unfractionated mouse spleen cells (13) and human leukocytes (14) but it’s function in these cells is unknown. These findings prompted us to examine in greater detail the distribution and regulation of the brain receptor in various immune cell populations. The results show receptor message is detected in some subpopulations but not in others and is increased during cell line activation. These results are consistent with a biological function of the receptor in immune cells. The relationship of this putative function, however, to THC-induced immunomodulation is currently not known." @default.
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- W1036896149 date "1995-01-01" @default.
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- W1036896149 title "Expression of Cannabinoid Receptor mRNA in Murine and Human Leukocytes" @default.
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- W1036896149 doi "https://doi.org/10.1007/978-1-4615-1951-5_13" @default.
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