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Arachidonic acid, which is a by-product of the luteolytic cascade in ruminants, is a potential paracrine signal from the epithelium to the stroma. We investigated the effects of arachidonic acid on the response of the stroma to PGE2. cAMP was measured in bovine endometrial stromal cells treated with agents known to activate or inhibit adenylyl cyclase, protein kinase C (PKC) or phosphodiesterase (PDE). PGE2 increased the intracellular cAMP concentration within 10 min, and this effect was attenuated by arachidonic acid and the PKC activator, 4\u03b2-phorbol myristate acetate (PMA). The inhibitory effect of arachidonic acid on PGE2-induced cAMP accumulation was prevented by the PKC inhibitor, RO318425, and was absent in cells in which PKC had been downregulated by exposure to PMA for 24 h. The effect of arachidonic acid was also prevented by the PDE inhibitor, 3-isobutyl-1-methylxanthine. Arachidonic acid was shown by immunoblotting to prevent induction of cyclooxygenase-2 by PGE2, forskolin or dibutyryl cAMP. The results indicate that arachidonic acid activates PDE through a mechanism involving PKC, counteracting a rise in intracellular cAMP in response to PGE2. The data suggest that arachidonic acid antagonizes PGE2 signalling through cAMP in the bovine endometrium, possibly acting to ensure a rapid return to oestrus in the case of failure of the maternal recognition of pregnancy.<\/jats:p>","DOI":"10.1530\/rep-06-0220","type":"journal-article","created":{"date-parts":[[2007,7,6]],"date-time":"2007-07-06T14:52:55Z","timestamp":1183733575000},"page":"1017-1026","update-policy":"https:\/\/doi.org\/10.1530\/crossmarkpolicy-11","source":"Crossref","is-referenced-by-count":11,"title":["Control of cyclic AMP concentration in bovine endometrial stromal cells by arachidonic acid"],"prefix":"10.1093","volume":"133","author":[{"given":"Z","family":"Cheng","sequence":"first","affiliation":[{"name":"School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough LE12 5RD, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"E L","family":"Sheldrick","sequence":"additional","affiliation":[{"name":"School of 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