Cannabinoid action in the olfactory epithelium.
The perception of odors is influenced by a variety of neuromodulators, and there is growing evidence that modulation already takes place in the olfactory epithelium. Here we report on cannabinergic actions in the olfactory epithelium of Xenopus laevis tadpoles. First we show that CB1 receptor-specific antagonists AM251, AM281, and LY320135 modulate odor-evoked calcium changes in olfactory receptor neurons. Second, we localize CB1-like immunoreactivity on dendrites of olfactory receptor neurons. Finally, we describe the cannabinergic influence on odor-induced spike-associated currents in individual olfactory receptor neurons. Here we demonstrate that the cannabinergic system has a profound impact on peripheral odor processing and discuss its possible function.
Czesnik
Dirk
D
Department of Neurophysiology and Cellular Biophysics and Deutsche Forschungsgemeinschaft Research Center for Molecular Physiology of the Brain, University of Göttingen, Humboldtallee 23, 37073 Göttingen, Germany. dczesni@gwdg.de
Schild
Detlev
D
Kuduz
Josko
J
Manzini
Ivan
I
D000200:Action Potentials / Q000187:drug effects; D000818:Animals; D020013:Calcium Signaling / Q000187:drug effects; D002186:Cannabinoids / Q000378:metabolism*; D066298:In Vitro Techniques; D007814:Larva / Q000166:cytology / Q000187:drug effects; D009831:Olfactory Mucosa / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D018034:Olfactory Receptor Neurons / Q000166:cytology / Q000187:drug effects; D010880:Piperidines / Q000494:pharmacology; D011720:Pyrazoles / Q000494:pharmacology; D043884:Receptor, Cannabinoid, CB1 / Q000037:antagonists & inhibitors; D014982:Xenopus laevis
D002186:Cannabinoids; D010880:Piperidines; D011720:Pyrazoles; D043884:Receptor, Cannabinoid, CB1; C103505:AM 251