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Abstract

Inhibitory effects of substance P and carbachol on the saturable sodium-dependent uptake process of myo-inositol in rat parotid gland.

Y Torrens, M Dietl, J C Beaujouan and J Glowinski
Journal of Pharmacology and Experimental Therapeutics August 1991, 258 (2) 639-646;
Y Torrens
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M Dietl
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J C Beaujouan
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J Glowinski
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Abstract

myo-Inositol uptake in prisms of rat parotid glands was investigated by measuring both the accumulation of free myo-[3H] inositol into the cytosol and its incorporation into phospholipids. Total myo-[3H]inositol uptake involved two distinct processes, a prominent one which is saturable and sodium-dependent (Km, 95 microM; Vmax, 8 pmol/mg of protein per min) and a minor one, nonsaturable and sodium-independent. Phloretin and cytochalasin B, two inhibitors of hexose transport, and D-glucose, but only at high concentrations (greater than 10 mM), inhibited myo-[3H]inositol uptake. Dixon plots of the data indicated that D-glucose inhibition was noncompetitive suggesting that myo-inositol and D-glucose are transported by different carriers. Electrogenic cotransport of sodium and myo-inositol, rather than energy derived from mitochondrial oxidative metabolism, seems to be involved in the transport process. Thus, ouabain, monensin or veratridine, all of which increase intracellular sodium concentrations, reduced myo-[3H]inositol uptake, whereas dinitrophenol, potassium cyanide and carbonyl cyanide m-chlorophenyl hydrazone were without effect. Substance P affected only the sodium-dependent uptake process of myo-[3H]inositol, this inhibitory effect requiring extracellular calcium. Similar observations were made with the muscarinic agonist carbachol. From these results, an increase in intracellular sodium concentration linked to the activation of calcium-sensitive cation-permeant channels appears to be responsible for the inhibitory effects of substance P and carbachol on myo-[3H]inositol uptake, these effects being mediated respectively by NK1 and muscarinic receptors coupled to a phospholipase C.

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Journal of Pharmacology and Experimental Therapeutics
Vol. 258, Issue 2
1 Aug 1991
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Abstract

Inhibitory effects of substance P and carbachol on the saturable sodium-dependent uptake process of myo-inositol in rat parotid gland.

Y Torrens, M Dietl, J C Beaujouan and J Glowinski
Journal of Pharmacology and Experimental Therapeutics August 1, 1991, 258 (2) 639-646;

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Abstract

Inhibitory effects of substance P and carbachol on the saturable sodium-dependent uptake process of myo-inositol in rat parotid gland.

Y Torrens, M Dietl, J C Beaujouan and J Glowinski
Journal of Pharmacology and Experimental Therapeutics August 1, 1991, 258 (2) 639-646;
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