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Research ArticleArticle

The Muscarinic Acetylcholine Receptor-Stimulated Increase in Aquaporin-5 Levels in the Apical Plasma Membrane in Rat Parotid Acinar Cells Is Coupled with Activation of Nitric Oxide/cGMP Signal Transduction

Yasuko Ishikawa, Hirokazu Iida and Hajime Ishida
Molecular Pharmacology June 2002, 61 (6) 1423-1434; DOI: https://doi.org/10.1124/mol.61.6.1423
Yasuko Ishikawa
Department of Pharmacology, Tokushima University School of Dentistry, Tokushima, Japan
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Hirokazu Iida
Department of Pharmacology, Tokushima University School of Dentistry, Tokushima, Japan
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Hajime Ishida
Department of Pharmacology, Tokushima University School of Dentistry, Tokushima, Japan
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Abstract

The present study investigated the role of nitric oxide (NO)/cGMP signal transduction in the M3 muscarinic acetylcholine receptor (mAChR)-stimulated increase in aquaporin-5 (AQP5) levels in the apical plasma membrane (APM) of rat parotid glands. Pretreatment of rat parotid tissue with the NO scavenger 2-(4carboxyphenyl)-4,4,5,5-tetramethyl-imidazoline-1-oxyl-3-oxide potassium inhibited both acetylcholine (ACh)- and pilocarpine-induced increases in AQP5 in the APM. NO donors [3-morpholinosydnonimine (SIN-1) and (S)-nitroso-N-acetylpenicillamine (SNAP)] mimicked the effects of mAChR agonists. A selective protein kinase G inhibitor [(9S,10R,12R)-2,3,9,10,11,12-hexahydro-10-methoxy-2,9-dimethyl-1-oxo-9,12-epoxy-1H-diindolo-[1,2,3-fg-3′,2′,1′-kl]pyrrolo[3,4-i][1,6]benzodiazocine-10-carboxylic acid methyl ester (KT5823)] and an NO synthase inhibitor (N 6-imminoethyl-l-lysine) blocked SIN-1- and SNAP-induced increases in AQP5 in the APM. A calmodulin kinase II inhibitor [(8)-5-isoquinolinesulfonic acid, 4-[2-(5-isoquinolinyl-sulfonyl)methylamino]-3-oxo-(4-phenyl-1-piperazinyl)-propyl]phenyl ester (KN-62)] decreased the pilocarpine-induced increase of AQP5 in the APM. Using diaminofluorescinein-2 diacetate, enhanced NO synthase activity was detected in isolated parotid acinar cells after ACh-treatment. Treatment with dibutyryl cGMP, but not dibutyryl cAMP, induced an increase in AQP5 levels in the APM. BAPTA-AM inhibited the cGMP-induced increase in AQP5 in the APM. Pretreatment of the tissues with a myosin light chain kinase inhibitor [(5-chloronaphthalene-1-sulfonyl)-1H-hexahydro-1,4-diazepine (ML-9)] inhibited a mAChR-stimulated increase in AQP5 levels in the APM. Although there was a significant ACh-induced increase in AQP5 in the APM in the absence of extracellular Ca2+, the maximal effect of ACh on the AQP5 levels in the APM occurred in the presence of extracellular Ca2+. These results suggest that NO/cGMP signal transduction has a crucial role in Ca2+ homeostasis in the mAChR-stimulated increase in AQP5 levels in the APM of rat parotid glands.

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Molecular Pharmacology: 61 (6)
Molecular Pharmacology
Vol. 61, Issue 6
1 Jun 2002
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Research ArticleArticle

The Muscarinic Acetylcholine Receptor-Stimulated Increase in Aquaporin-5 Levels in the Apical Plasma Membrane in Rat Parotid Acinar Cells Is Coupled with Activation of Nitric Oxide/cGMP Signal Transduction

Yasuko Ishikawa, Hirokazu Iida and Hajime Ishida
Molecular Pharmacology June 1, 2002, 61 (6) 1423-1434; DOI: https://doi.org/10.1124/mol.61.6.1423

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Research ArticleArticle

The Muscarinic Acetylcholine Receptor-Stimulated Increase in Aquaporin-5 Levels in the Apical Plasma Membrane in Rat Parotid Acinar Cells Is Coupled with Activation of Nitric Oxide/cGMP Signal Transduction

Yasuko Ishikawa, Hirokazu Iida and Hajime Ishida
Molecular Pharmacology June 1, 2002, 61 (6) 1423-1434; DOI: https://doi.org/10.1124/mol.61.6.1423
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