Event Abstract Back to Event Role of endocannabinoids in the regulation of the cortical blood flow Eva Ruisanchez1*, Ishiguro M. Leszl1, Rita Benko1, Zsombor Lacza1, Zoltan Jarai2, Peter Sandor1 and Zoltan Benyo1 1 Institute of Human Physiology and Clinical Experimental Research, Semmelweis University, Hungary 2 1st Department of Internal Medicine, Semmelweis University, Hungary The influence of endocannabinoids on the resting blood flow and on hypoxia/hypercapnia (H/H)-induced vasodilation was investigated in the cerebral cortex with laser-Doppler (LD) flowmetry in anesthetized adult male Wistar rats. Inhibition of endocannabinoid reuptake by AM-404 (10 mg/kg) resulted in a transient increase of the resting cerebrocortical blood flow (CBF), which had a peak (+65±16 %) at 5.2±0.6 minutes and disappeared within 10 minutes. The CBF changes were accompanied by reduction of the ventilation rate as well as by increased arterial CO2 tension (PaCO2) and decreased O2 tension (PaO2). Application of the CB1 receptor antagonist AM-251 (10 mg/kg iv) did not alter baseline CBF but significantly increased the H/H-induced hyperemia: by 30 % during mild H/H (PaO2=75-85, PaCO2=50-60 mmHg), by 22 % during moderate H/H (PaO2=55-65, PaCO2=80-90 mmHg), and by 14 % during severe H/H (PaO2=45-50, PaCO2=90-100 mmHg). In contrast, vehicle of AM-251 had no significant effect. H/H did not change mean arterial pressure in untreated or vehicle-treated animals, although following AM-251 treatment it induced slight hypertension (+11 ± 6 mmHg). Furthermore, AM-251 was able to prevent the effects of AM-404 while the VR1 receptor antagonist capsazepine (20 mg/kg) had no effect. In conclusion our results indicate that endocannabinoids may increase the resting CBF either by a CB1-mediated direct vasodilator mechanism or indirectly via respiratory depression and the consequent changes of the blood gas tensions. Interestingly, activation of CB1 receptors attenuates the H/H induced cerebrocortical hyperaemia by a yet undefined mechanism. Supported by OTKA K62375 and NKTH H07-BEL74286 grants. Conference: 12th Meeting of the Hungarian Neuroscience Society, Budapest, Hungary, 22 Jan - 24 Jan, 2009. Presentation Type: Poster Presentation Topic: Pathophysiology and neurology - degenerative disorders Citation: Ruisanchez E, Leszl IM, Benko R, Lacza Z, Jarai Z, Sandor P and Benyo Z (2009). Role of endocannabinoids in the regulation of the cortical blood flow. Front. Syst. Neurosci. Conference Abstract: 12th Meeting of the Hungarian Neuroscience Society. doi: 10.3389/conf.neuro.01.2009.04.172 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 05 Mar 2009; Published Online: 05 Mar 2009. * Correspondence: Eva Ruisanchez, Institute of Human Physiology and Clinical Experimental Research, Semmelweis University, Budapest, Hungary, ruievi@gmail.com Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Eva Ruisanchez Ishiguro M Leszl Rita Benko Zsombor Lacza Zoltan Jarai Peter Sandor Zoltan Benyo Google Eva Ruisanchez Ishiguro M Leszl Rita Benko Zsombor Lacza Zoltan Jarai Peter Sandor Zoltan Benyo Google Scholar Eva Ruisanchez Ishiguro M Leszl Rita Benko Zsombor Lacza Zoltan Jarai Peter Sandor Zoltan Benyo PubMed Eva Ruisanchez Ishiguro M Leszl Rita Benko Zsombor Lacza Zoltan Jarai Peter Sandor Zoltan Benyo Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.