Abstract
Lobaric acid, a constituent of the lichen Stereocaulon alpinum, was investigated for effects on the smooth muscle taenia coli from guinea pigs. Inhibitory effects of lobaric acid on spontaneous contractile activity and on contractile activity stimulated by ionophore A23187 were studied. In addition, the activity of lobaric acid on ionophore-induced generation of cysteinyl-leukotrienes in taenia coli was determined by enzyme immunoassay. Lobaric acid significantly reduced spontaneous contractile activity of the muscle and inhibited contractions caused by ionophore A23187 with an effective dose of 5.8 μM. Increased contractility caused by leukotriene D4 was not influenced by lobaric acid. Lobaric acid inhibited the formation of cysteinyl-leukotrienes as determined by enzyme immunoassay with an effective dose of 5.5 μM.
Footnotes
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Send reprint requests to: Kristin Ingolfsdottir, University of Iceland, Department of Pharmacy, Hagi/Hofsvallagata, 107 Reykjavik, Iceland.
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↵1 Supported by grants from the Icelandic Council of Science, University of Iceland Research Fund and NM Pharma Research Fund.
- Abbreviations:
- EIA
- enzyme immunoassay
- ED50
- effective dose
- DMSO
- dimethyl sulfoxide
- S.E.
- standard error
- S.E.M.
- standard error of the mean
- Received May 22, 1996.
- Accepted October 1, 1996.
- The American Society for Pharmacology and Experimental Therapeutics
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