title: Possible non-involvement of lipoxygenase pathway in the cerebral blood flow decrease due to indomethacin.
abstract: Indomethacin (10n mg/kg i.p.) induced a marked decrease in local cerebral blood flow (l.CBF), which was measured in the frontal cortex of unanesthetized rats by the hydrogen clearance technique. Brain prostaglandins (PGD2, PGE2, PGF2 alpha,) and 6kPGF1 alpha the stable metabolite of prostacyclin, were significantly decreased. Treatments with inhibitors of lipoxygenase (BW 755C and nordihydroguaiaretic acid) and with FPL 55712, a leukotriene receptor antagonist, did not influence the effect of indomethacin on 1.CBF. The results suggest that the release of vasoconstrictory leukotrienes does not play a major role in the lowering of 1.CBF by indomethacin.
mesh_terms: D015772:4,5-Dihydro-1-(3-(trifluoromethyl)phenyl)-1H-pyrazol-3-amine; D000818:Animals; D002396:Catechols / Q000494:pharmacology; D002560:Cerebrovascular Circulation / Q000187:drug effects*; D002867:Chromones / Q000494:pharmacology; D007213:Indomethacin / Q000494:pharmacology*; D008084:Lipoxygenase / Q000502:physiology*; D016859:Lipoxygenase Inhibitors; D008297:Male; D009637:Masoprocol; D011453:Prostaglandins / Q000378:metabolism; D011720:Pyrazoles / Q000494:pharmacology; D051381:Rats; D011919:Rats, Inbred Strains; D012039:Regional Blood Flow / Q000187:drug effects; D013189:SRS-A / Q000378:metabolism; D014661:Vasoconstriction / Q000187:drug effects
chemical_list: D002396:Catechols; D002867:Chromones; D016859:Lipoxygenase Inhibitors; D011453:Prostaglandins; D011720:Pyrazoles; D013189:SRS-A; D015772:4,5-Dihydro-1-(3-(trifluoromethyl)phenyl)-1H-pyrazol-3-amine; D009637:Masoprocol; C006312:FPL 55712; D008084:Lipoxygenase; D007213:Indomethacin