Schwalm SF, Lewis AJ, Hand JM. Inhibition of leukotriene-induced contraction of guinea pig trachea by 5-lipoxygenase inhibitors.
PROSTAGLANDINS 1987;
33:113-9. [PMID:
3108959 DOI:
10.1016/0090-6980(87)90309-1]
[Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The effects of the 5-lipoxygenase inhibitors nordihydroguiaretic acid (NDGA), 5, 8, 11, 14-eicosatetraynoic acid (ETYA), 1-phenyl-3-pyrazolidone (phenidone) and BW-755c, on the contractile response to LTC4 or LTD4 were examined on the isolated guinea pig trachea. Responses to either LTC4 or LTD4 were obtained on indomethacin treated tissues, in the presence of either L-serine-borate complex or L-cysteine, respectively, to inhibit metabolic conversion of the leukotrienes. NDGA (30 microM) and ETYA (100 microM) produced a selective competitive antagonism of LTD4-induced contractions, while phenidone antagonized both LTC4- and LTD4-induced responses in a non-competitive manner. In contrast, BW-755c (30 microM) did not significantly antagonize LTC4 or LTD4 concentration-response curves. The results suggest that leukotriene antagonism may be produced by large concentrations of some 5-lipoxygenase inhibitors.
Collapse