Abstract
1. The effects of endothelin-1 (ET-1) and of the muscarinic cholinoceptor agonist, carbachol, on [3H]-inositol phosphate ([3H]-InsP) accumulation and smooth muscle contraction were determined in rat isolated tracheal tissue. 2. ET-1 (1 microM) and carbachol (10 microM) induced significant accumulation of [3H]-InsPs in myo-[2-3H]-inositol-loaded rat tracheal segments. Several components of the tracheal wall including the airway smooth muscle band, the cartilaginous region and the intercartilaginous region generated significant levels of [3H]-InsPs in response to ET-1 and carbachol. Following stimulation with ET-1, a greater proportion of tracheal [3H]-InsPs were generated in the intercartilaginous region (49%) than in either the airway smooth muscle band (25%) or cartilaginous region (26%). However, when the respective weights of these regions is taken into account, ET-1-induced accumulation of [3H]-InsPs was greatest in the airway smooth muscle band. The tracheal epithelium did not appear to generate [3H]-InsPs in response to ET-1 or modulate either basal or ET-1-induced accumulation of [3H]-InsPs in rat tracheal segments. 3. In the rat tracheal smooth muscle band, ET-1 caused a time- and concentration-dependent accumulation of [3H]-InsPs. Concentrations of ET-1 as low as 10 nM produced significant accumulation of [3H]-InsPs (1.23 +/- 0.10 fold increase above basal levels of 295 +/- 2 d.p.m. mg-1 wet wt., n = 3 experiments).(ABSTRACT TRUNCATED AT 250 WORDS)
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