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. 1992 Nov;107(3):808–812. doi: 10.1111/j.1476-5381.1992.tb14528.x

Neurokinin A-induced contraction of guinea-pig isolated trachea: potentiation by hepoxilins.

O Laneuville 1, R Couture 1, C R Pace-Asciak 1
PMCID: PMC1907779  PMID: 1335339

Abstract

1. Hepoxilin A3 (8R and 8S isomers) (HxA3), hepoxilin A3-C (8R and 8S isomers) (HxA3-C) and trioxilin A3 (8S isomer) (TrXA3, the stable derivative of HxA3) were tested for their effects on helicoidal strips of guinea-pig isolated tracheae. 2. None of the compounds (10(-9)-10(-6) M) tested had a direct effect on resting tension of trachea. 3. HxA3 (8S) and HxA3-C (8R) (10(-8) M) produced a significant leftward shift of the log concentration-response curves to neurokinin A (NKA) (EC50 (nM), control = 29.0 +/- 2.8, HxA3 (8S) = 21.7 +/- 3.7, HxA3-C (8R) = 13.8 +/- 3.8, n = 6 for each). Also the maximal response to NKA was significantly increased when the tissues were exposed to these hepoxilins (% of the maximal response to NKA, control = 100, HxA3 (8S) = 114.5 +/- 5.3, HxA3-C (8R) = 139.0 +/- 6.2, n = 6 for each). The threshold concentrations for both hepoxilins was 10(-8) M and their effects were dose-related. 4. Stereochemical specificity was observed. The 8S-isomer of HxA3 was active in potentiating the NKA-induced contraction of the trachea while the 8R isomer was inactive. In contrast, the 8R isomer of HxA3-C was active while the 8S isomer was inactive. The trihydroxy metabolite of the active isomer of HxA3 (8S), i.e. TrXA3 (8S) (10(-6) M), was inactive in potentiating the NKA-induced contraction of the trachea. 5. It is concluded that hepoxilins sensitize the guinea-pig isolated trachea to the potent bronchoconstrictor, NKA.

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Selected References

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