Medizinische Universität Graz Austria/Österreich - Forschungsportal - Medical University of Graz
Gewählte Publikation:
Zoratti, C; Kipmen-Korgun, D; Osibow, K; Malli, R; Graier, WF.
Anandamide initiates Ca(2+) signaling via CB2 receptor linked to phospholipase C in calf pulmonary endothelial cells.
Br J Pharmacol. 2003; 140(8):1351-1362
Doi: 10.1038/sj.bjp.0705529
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- Führende Autor*innen der Med Uni Graz
- Graier Wolfgang
- Co-Autor*innen der Med Uni Graz
- Malli Roland
- Osibow Karin
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- Abstract:
- The endocannabinoid anandamide has been reported to affect neuronal cells, immune cells and smooth muscle cells via either CB1 or CB2 receptors. In endothelial cells, the receptors involved in activating signal transduction are still unclear, despite the fact that anandamide is produced in this cell type. The present study was designed to explore in detail the effect of this endocannabinoid on Ca2+ signaling in single cells of a calf pulmonary endothelial cell line. Anandamide initiated a transient Ca2+ elevation that was prevented by the CB2 receptor antagonist SR144528, but not by the CB1 antagonist SR141716A. These data were confirmed by molecular identification of the bovine CB2 receptor in these endothelial cells by partial sequencing. The phospholipase C inhibitor 1-[6-[[(17beta)-3-methoxyestra-1,3,5(10)-trien-17-yl]amino]hexyl]-1H-pyrrole-2,5dione and the inositol 1,4,5-trisphosphate receptor antagonist 2-aminoethoxydiphenylborate prevented Ca2+ signaling in response to anandamide. Using an improved cameleon probe targeted to the endoplasmic reticulum (ER), fura-2 and ratiometric-pericam, which is targeted to the mitochondria, anandamide was found to induce Ca2+ depletion of the ER accompanied by the activation of capacitative Ca2+ entry (CCE) and a transient elevation of mitochondrial Ca2+. These data demonstrate that anandamide stimulates the endothelial cells used in this study via CB2 receptor-mediated activation of phospholipase C, formation of inositol 1,4,5-trisphosphate, Ca2+ release from the ER and subsequent activation of CCE. Moreover, the cytosolic Ca2+ elevation was accompanied by a transient Ca2+ increase in the mitochondria. Thus, in addition to its actions on smooth muscle cells, anandamide also acts as a powerful stimulus for endothelial cells.
- Find related publications in this database (using NLM MeSH Indexing)
- Animals -
- Arachidonic Acids - metabolism
- Base Sequence - metabolism
- Calcium - metabolism
- Calcium Channel Blockers - pharmacology
- Calcium Signaling - pharmacology
- Cattle - pharmacology
- Cell Line - pharmacology
- Endocannabinoids - metabolism
- Endoplasmic Reticulum - drug effects
- Endothelium, Vascular - cytology
- Humans - cytology
- Mice - cytology
- Mitochondria - drug effects
- Molecular Sequence Data - drug effects
- Phospholipase C - antagonists and inhibitors
- Polyunsaturated Alkamides - antagonists and inhibitors
- Pulmonary Artery - cytology
- Receptor, Cannabinoid, CB1 - antagonists and inhibitors
- Receptor, Cannabinoid, CB2 - antagonists and inhibitors
- Reverse Transcriptase Polymerase Chain Reaction - antagonists and inhibitors
- Find related publications in this database (Keywords)
- cameleon
- CB2 receptor
- Ca2+ mobilization
- endoplasmic reticulum Ca2+
- mitochondrial Ca2+
- phospholipase C
- ratiometric-pericam-mt
- SR141716A
- SR144528