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GPR55 regulates cannabinoid 2 receptor-mediated responses in human neutrophils

GPR55 regulates cannabinoid 2 receptor-mediated responses in human neutrophils The directional migration of neutrophils towards inflammatory mediators, such as chemokines and cannabinoids, occurs via the activation of seven transmembrane G protein coupled receptors (7TM/GPCRs) and is a highly organized process. A crucial role for controlling neutrophil migration has been ascribed to the cannabinoid CB2 receptor (CB2R), but additional modulatory sites distinct from CB2R have recently been suggested to impact CB2R-mediated effector functions in neutrophils. Here, we provide evidence that the recently de-orphanized 7TM/GPCR GPR55 potently modulates CB2R-mediated responses. We show that GPR55 is expressed in human blood neutrophils and its activation augments the migratory response towards the CB2R agonist 2-arachidonoylglycerol (2-AG), while inhibiting neutrophil degranulation and reactive oxygen species (ROS) production. Using HEK293 and HL60 cell lines, along with primary neutrophils, we show that GPR55 and CB2R interfere with each other's signaling pathways at the level of small GTPases, such as Rac2 and Cdc42. This ultimately leads to cellular polarization and efficient migration as well as abrogation of degranulation and ROS formation in neutrophils. Therefore, GPR55 limits the tissue-injuring inflammatory responses mediated by CB2R, while it synergizes with CB2R in recruiting neutrophils to sites of inflammation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Cell Research Springer Journals

GPR55 regulates cannabinoid 2 receptor-mediated responses in human neutrophils

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References (79)

Publisher
Springer Journals
Copyright
Copyright © 2011 by Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences
Subject
Life Sciences; Life Sciences, general; Cell Biology
ISSN
1001-0602
eISSN
1748-7838
DOI
10.1038/cr.2011.60
Publisher site
See Article on Publisher Site

Abstract

The directional migration of neutrophils towards inflammatory mediators, such as chemokines and cannabinoids, occurs via the activation of seven transmembrane G protein coupled receptors (7TM/GPCRs) and is a highly organized process. A crucial role for controlling neutrophil migration has been ascribed to the cannabinoid CB2 receptor (CB2R), but additional modulatory sites distinct from CB2R have recently been suggested to impact CB2R-mediated effector functions in neutrophils. Here, we provide evidence that the recently de-orphanized 7TM/GPCR GPR55 potently modulates CB2R-mediated responses. We show that GPR55 is expressed in human blood neutrophils and its activation augments the migratory response towards the CB2R agonist 2-arachidonoylglycerol (2-AG), while inhibiting neutrophil degranulation and reactive oxygen species (ROS) production. Using HEK293 and HL60 cell lines, along with primary neutrophils, we show that GPR55 and CB2R interfere with each other's signaling pathways at the level of small GTPases, such as Rac2 and Cdc42. This ultimately leads to cellular polarization and efficient migration as well as abrogation of degranulation and ROS formation in neutrophils. Therefore, GPR55 limits the tissue-injuring inflammatory responses mediated by CB2R, while it synergizes with CB2R in recruiting neutrophils to sites of inflammation.

Journal

Cell Research – Springer Journals

Published: Apr 5, 2011

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