Endothelin stimulates inositol phosphate accumulation in rat right and left atria: a comparison with noradrenaline.

Abstract:

:1. The effect of endothelin on phosphatidylinositol turnover in rat atria was investigated by measuring the generation of inositol phosphates following [3H]-inositol labelling. 2. In the presence of 10 mmol/L LiCl, endothelin caused dose-dependent increases in the accumulation of inositol mono, bis and trisphosphates which were maximal at 10(-6) mol/L endothelin. The dose-response relationship was similar in right and left atria, but right atria showed a higher maximal inositol phosphate response. 3. Endothelin produced a rapid and transient stimulation of inositol trisphosphate accumulation, which peaked at 15 s followed by a slower increase which continued linearly past 20 min. 4. The time course of inositol trisphosphate release under noradrenaline stimulation showed a similar profile but the maximum stimulation was smaller than endothelin. 5. As with endothelin, responses to noradrenaline also were higher in right atria compared with left atria. 6. These data demonstrate that endothelin receptors in rat atria are coupled to the stimulation of the phosphatidylinositol turnover pathway in an essentially similar manner to alpha 1-adrenoceptors. The phosphatidylinositol pathway may be important in mediating the reported cardiac actions of endothelin.

authors

Kuraja IJ,Woodcock EA

doi

10.1111/j.1440-1681.1990.tb01320.x

subject

Has Abstract

pub_date

1990-04-01 00:00:00

pages

275-80

issue

4

eissn

0305-1870

issn

1440-1681

journal_volume

17

pub_type

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