The endocannabinoid system in bull sperm and bovine oviductal epithelium: role of anandamide in sperm-oviduct interaction.
Anandamide binds to cannabinoid receptors and plays several central and peripheral functions. The aim of this work was to study the possible role for this endocannabinoid in controlling sperm-oviduct interaction in mammals. We observed that bull sperm and bovine oviductal epithelial cells express cannabinoid receptors, CB1 and CB2, and fatty acid amide hydrolase, the enzyme that controls intracellular anandamide levels. A quantitative assay to determine whether anandamide was involved in bovine sperm-oviduct interaction was developed. R(+)-methanandamide, a non-hydrolysable anandamide analog, inhibited sperm binding to and induced sperm release from oviductal epithelia. Selective CB1 antagonists (SR141716A or AM251) completely blocked R(+)-methanandamide effects. However, SR144528, a selective CB2 antagonist, did not exert any effect, indicating that only CB1 was involved in R(+)-methanandamide effect. This effect was not caused by inhibition of the sperm progressive motility or by induction of the acrosome reaction. Overall, our findings indicate for the first time that the endocannabinoid system is present in bovine sperm and oviductal epithelium and that anandamide modulates the sperm-oviduct interaction, by inhibition of sperm binding and induction of sperm release from oviductal epithelial cells, probably by activating CB1 receptors.
Gervasi
María Gracia
MG
Facultad de Medicina, Centro de Estudios Farmacológicos y Botánicos, Universidad de Buenos Aires, Buenos Aires, Argentina.
Rapanelli
Maximiliano
M
Ribeiro
María Laura
ML
Farina
Mariana
M
Billi
Silvia
S
Franchi
Ana María
AM
Perez Martinez
Silvina
S
D000581:Amidohydrolases / Q000037:antagonists & inhibitors / Q000378:metabolism; D000818:Animals; D001095:Arachidonic Acids / Q000494:pharmacology / Q000502:physiology*; D001549:Benzamides / Q000494:pharmacology; D015153:Blotting, Western / Q000379:methods; D001892:Camphanes / Q000494:pharmacology; D002219:Carbamates / Q000494:pharmacology; D002417:Cattle; D063388:Endocannabinoids; D004848:Epithelium / Q000378:metabolism; D005187:Fallopian Tubes / Q000378:metabolism*; D005260:Female; D007150:Immunohistochemistry; D008297:Male; D008856:Microscopy, Fluorescence; D010880:Piperidines / Q000494:pharmacology; D053284:Polyunsaturated Alkamides / Q000494:pharmacology; D011720:Pyrazoles / Q000494:pharmacology; D043884:Receptor, Cannabinoid, CB1 / Q000037:antagonists & inhibitors / Q000378:metabolism; D043885:Receptor, Cannabinoid, CB2 / Q000037:antagonists & inhibitors / Q000378:metabolism; D013081:Sperm Motility / Q000187:drug effects; D013084:Sperm-Ovum Interactions / Q000187:drug effects / Q000502:physiology*; D013094:Spermatozoa / Q000187:drug effects / Q000378:metabolism*; D000099252:Fatty Acid Amide Hydrolases
D000581:Amidohydrolases; D001095:Arachidonic Acids; D001549:Benzamides; D001892:Camphanes; D002219:Carbamates; D063388:Endocannabinoids; D010880:Piperidines; D053284:Polyunsaturated Alkamides; D011720:Pyrazoles; D043884:Receptor, Cannabinoid, CB1; D043885:Receptor, Cannabinoid, CB2; D000099252:Fatty Acid Amide Hydrolases; C110630:SR 144528; C500528:cyclohexyl carbamic acid 3'-carbamoylbiphenyl-3-yl ester; C088155:methanandamide; C103505:AM 251; C078814:anandamide