Receptor mediation in cannabinoid stimulated arachidonic acid mobilization and anandamide synthesis

Numerous reports have suggested that increased synthesis of eicosanoids is a significant effect of cannabinoids in several models including the human. To address the question of receptor mediation in this process we have carried out experiments using oligonucleotides that are antisense to the CB1 an...

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Veröffentlicht in:Life sciences (1973) 1997-03, Vol.60 (18), p.1563-1573
Hauptverfasser: Hunter, Sheila A., Burstein, Sumner H.
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Burstein, Sumner H.
description Numerous reports have suggested that increased synthesis of eicosanoids is a significant effect of cannabinoids in several models including the human. To address the question of receptor mediation in this process we have carried out experiments using oligonucleotides that are antisense to the CB1 and to the CB2 receptors. We have synthesized sense, antisense and random oligonucleotide probes to test for receptor involvement in THC stimulation of arachidonic acid release in three cell lines of both central and peripheral origin. Treatment of N18 mouse neuroblastoma cells with the CB1 antisense probe, at two concentrations, resulted in a dramatic decrease of THC stimulated arachidonate release while treatment with antisense CB2 was less effective. Synthesis of the novel eicosanoid, anandamide, was also reduced by antisense CB1 but not by antisense CB2. Western blot analysis indicated a decreased level of CB1 in CB1 antisense treated cells. The CB1 antagonist, SR141716A, was effective in reducing the THC elevated levels of free arachidonate in these cells in agreement with the antisense data. In the macrophage line, RAW 264.7, we found that while the sense, the random and the CB1 antisense oligonucleotides were ineffective, the CB2 antisense probe gave significant reductions of the THC induced response. The CB2 probe was also effective in reducing the release of arachidonate in WI-38 human lung fibroblasts. These findings support the idea of a receptor mediated process for cannabinoid stimulation of eicosanoid synthesis.
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To address the question of receptor mediation in this process we have carried out experiments using oligonucleotides that are antisense to the CB1 and to the CB2 receptors. We have synthesized sense, antisense and random oligonucleotide probes to test for receptor involvement in THC stimulation of arachidonic acid release in three cell lines of both central and peripheral origin. Treatment of N18 mouse neuroblastoma cells with the CB1 antisense probe, at two concentrations, resulted in a dramatic decrease of THC stimulated arachidonate release while treatment with antisense CB2 was less effective. Synthesis of the novel eicosanoid, anandamide, was also reduced by antisense CB1 but not by antisense CB2. Western blot analysis indicated a decreased level of CB1 in CB1 antisense treated cells. The CB1 antagonist, SR141716A, was effective in reducing the THC elevated levels of free arachidonate in these cells in agreement with the antisense data. In the macrophage line, RAW 264.7, we found that while the sense, the random and the CB1 antisense oligonucleotides were ineffective, the CB2 antisense probe gave significant reductions of the THC induced response. The CB2 probe was also effective in reducing the release of arachidonate in WI-38 human lung fibroblasts. 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subjects anandamide
Animals
antisense oligonucleotides
arachidonic acid
Arachidonic Acid - metabolism
Arachidonic Acids - biosynthesis
Blotting, Western
cannabinoid
Cell Line
Dronabinol - metabolism
Dronabinol - pharmacology
Endocannabinoids
Humans
Mice
Oligonucleotides, Antisense - metabolism
Oligonucleotides, Antisense - pharmacology
Piperidines - pharmacology
Polyunsaturated Alkamides
Pyrazoles - pharmacology
Receptors, Cannabinoid
Receptors, Drug - antagonists & inhibitors
Receptors, Drug - genetics
Receptors, Drug - metabolism
Rimonabant
Tumor Cells, Cultured
title Receptor mediation in cannabinoid stimulated arachidonic acid mobilization and anandamide synthesis
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