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. 1992 Aug;106(4):865–870. doi: 10.1111/j.1476-5381.1992.tb14426.x

The effects of noradrenaline and adenosine 5'-triphosphate on polyphosphoinositide and phosphatidylcholine hydrolysis in arterial smooth muscle.

J E Nally 1, T C Muir 1, S B Guild 1
PMCID: PMC1907671  PMID: 1327389

Abstract

1. The effects of noradrenaline and alpha,beta,methylene adenosine 5'-triphosphate (alpha,beta,methylene ATP) on polyphosphoinositide metabolism, phosphatidylcholine hydrolysis and contraction in rabbit saphenous arteries were investigated. The effect of noradrenaline upon polyphosphoinositide metabolism was also investigated in the rat tail artery. 2. Noradrenaline (10(-7)-10(-4) M) evoked a concentration-dependent increase in total inositol phosphate accumulation in the rat tail but not in the rabbit saphenous artery. Propranolol (3 x 10(-6) M) did not alter this result in the rabbit saphenous artery. In addition, alpha,beta,methylene ATP (10(-6) M) significantly increased total inositol phosphate accumulation in the rabbit saphenous artery, while potassium chloride (8 x 10(-2) M) was ineffective. 3. Phorbol 1,2-myristate 1,3-acetate (3 x 10(-8) M) enhanced noradrenaline (10(-2)-10(-4) M)-evoked contractions in rabbit saphenous artery. The contractile responses to potassium chloride (1- 16 x 10(-2) M) in tissues treated with 6-hydroxydopamine (5 x 10(-4) M), in vitro, were unaffected by these concentrations of the phorbol ester. 4. Noradrenaline (10(-6)-10(-4) M) evoked a concentration-dependent increase in the levels of choline and choline phosphate, but not in those of glycerophosphocholine, in the rabbit saphenous artery. Choline levels increased significantly over the first 15-30 s then declined to control levels within 2 min of addition of noradrenaline (10(-5) M). A smaller initial rise in choline phosphate levels (15-30 s) was followed by a larger secondary rise at 2-4 min.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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