Studies on the role of arachidonic acid metabolites in airways contraction induced in vitro by antigen and calcium ionophore A23187

Agents and Actions
J F Burka

Abstract

The effects of inhibitors of the cyclooxygenase and lipoxygenase pathways of arachidonic acid (AA) metabolism were studied on the contractions of guinea pig tracheal spirals and lung parenchymal strips induced by antigen and calcium ionophore A23187. Inhibition of the cyclooxygenase pathway with indomethacin results in enhancement of antigen- and A23187-induced contraction of trachea which is a result of diversion of AA into the lipoxygenase pathway and inhibition of modulatory cyclooxygenase products. Indomethacin does not enhance parenchymal contractions but partly inhibits contraction induced by a strong stimulus (5.7 microM A23187 or 100 micrograms/ml ovalbumin). Parenchymal contraction is inhibited by agents that block the lipoxygenase pathway of AA metabolism, phenidone and nordihydroguaiaretic acid. These agents inhibit the prolonged phase of antigen-induced tracheal contraction but in some cases enhance the early phase of tracheal contraction induced by antigen or A23187. The results suggest that contraction of parenchyma induced by antigen or A23187 are the result of a bronchoconstrictor lipoxygenase product and only have a cyclooxygenase bronchoconstrictor component following a strong stimulus. In contrast, contractio...Continue Reading

References

Feb 15, 1979·European Journal of Pharmacology·H W Mitchell, M A Denborough
Oct 1, 1979·Agents and Actions·K Forsberg, L Sörenby
Apr 9, 1981·European Journal of Pharmacology·J F Burka, N A Paterson
Sep 5, 1980·Science·F Hirata, J Axelrod
Oct 1, 1981·Canadian Journal of Physiology and Pharmacology·J F Burka, N A Paterson
Jul 10, 1981·European Journal of Pharmacology·B B VargaftigR C Murphy
Jun 1, 1965·The Journal of Pharmacy and Pharmacology·J W CONSTANTINE

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Citations

Apr 13, 1984·European Journal of Pharmacology·M H Saad, J F Burka
May 1, 1983·Prostaglandins·M H SaadJ F Burka
Jun 1, 1995·British Journal of Pharmacology·G GentiliniL Zilletti
Mar 1, 1988·Prostaglandins, Leukotrienes, and Essential Fatty Acids·P H WaringP J Kadowitz
Jul 1, 1984·Acta Pharmacologica Et Toxicologica·M DahlbäckL Sörenby

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