Document Detail


The endocannabinoid arachidonyl ethanolamide (anandamide) increases pulmonary arterial pressure via cyclooxygenase-2 products in isolated rabbit lungs.
MedLine Citation:
PMID:  16055511     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Several cannabinoids elicit systemic vasodilation, mainly via CB1 cannabinoid and vanilloid receptors. However, effects in the pulmonary circulation are unknown. Using the isolated, ventilated, buffer-perfused rabbit lung, we have shown that the endocannabinoids arachidonyl ethanolamide (anandamide) and 2-arachidonyl glycerol (2-AG) dose-dependently increase pulmonary arterial pressure (+19.9 +/- 3.4 mmHg, 5 microM, and +39.5 +/- 10.8 mmHg, 0.4 microM, respectively). 2-AG induced lung edema. The CB1 receptor antagonist AM-251 (0.1 and 5 microM) and the VR1 vanilloid receptor antagonist capsazepine (10 microM) failed to reduce anandamide's effects. The metabolically stable anandamide and 2-AG analogs R-methanandamide and noladin ether, Delta9-tetrahydrocannabinol, and the synthetic cannabinoid HU-210, which is no arachidonic acid product, were without effect. The unspecific cyclooxygenase (COX) inhibitor aspirin (100 microM, P < 0.001) and the specific COX-2 inhibitor nimesulide (10 microM, P < 0.01) completely prevented pulmonary hypertension after 5 microM anandamide. COX-2 RNA was detected in rabbit lungs. The synthetic thromboxane receptor antagonist SQ 29,548 was without effect, but the specific EP1 prostanoid receptor antagonist SC-19220 (100 microM) inhibited the pressure increase after anandamide (P < 0.05). PCR analysis detected fatty acid amidohydrolase (FAAH), an enzyme that degrades endocannabinoids, in rabbit lung tissue. Furthermore, the specific FAAH inhibitor methyl arachidonyl fluorophosphonate (0.1 microM) blocked pressure effects of anandamide (P < 0.01). Finally, anandamide (99 +/- 55 pmol/g) and 2-AG (19.6 +/- 8.4 nmol/g) were found in native lungs. We conclude that anandamide increases pulmonary arterial pressure via COX-2 metabolites following enzymatic degradation by FAAH into arachidonic acid products.
Authors:
Hans Wahn; Jürgen Wolf; Florian Kram; Stefan Frantz; Jens A Wagner
Publication Detail:
Type:  In Vitro; Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-07-29
Journal Detail:
Title:  American journal of physiology. Heart and circulatory physiology     Volume:  289     ISSN:  0363-6135     ISO Abbreviation:  Am. J. Physiol. Heart Circ. Physiol.     Publication Date:  2005 Dec 
Date Detail:
Created Date:  2005-11-14     Completed Date:  2006-01-10     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100901228     Medline TA:  Am J Physiol Heart Circ Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  H2491-6     Citation Subset:  IM    
Affiliation:
Medizinische Universitaetsklinik, Josef-Schneider-Str. 2, 97080 Würzburg, Germany.
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MeSH Terms
Descriptor/Qualifier:
Animals
Arachidonic Acids / administration & dosage*
Blood Pressure / drug effects,  physiology*
Cyclooxygenase 2 / metabolism*
Dose-Response Relationship, Drug
Endocannabinoids / administration & dosage
Male
Polyunsaturated Alkamides
Pulmonary Artery / drug effects,  physiology*
Rabbits
Chemical
Reg. No./Substance:
0/Arachidonic Acids; 0/Endocannabinoids; 0/Polyunsaturated Alkamides; 94421-68-8/anandamide; EC 1.14.99.1/Cyclooxygenase 2

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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