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Am J Physiol Cell Physiol 260: C194-C200, 1991;
0363-6143/91 $5.00
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AJP - Cell Physiology, Vol 260, Issue 2 C194-C200, Copyright © 1991 by American Physiological Society

ARTICLES

NaF-induced amylase release from rat parotid cells is mediated by PI breakdown leading to Ca2+ mobilization

Y. Tojyo, A. Tanimura, S. Matsui, Y. Matsumoto, H. Sugiya and S. Furuyama
Department of Dental Pharmacology, School of Dentistry, Higashi-Nippon-Gakuen University, Hokkaido, Japan.

We have examined the effects of sodium fluoride (NaF) on amylase release, cellular adenosine 3',5'-cyclic monophosphate (cAMP) level, inositol phosphate formation, and cytosolic free Ca2+ concentration ([Ca2+]i) in dispersed rat parotid acini or cells. At concentrations greater than 1 mM, NaF significantly increased amylase release. The maximum response was observed at 10 mM NaF and was comparable to that of the muscarinic-cholinergic agonist carbachol. Removal of extracellular Ca2+ with EGTA markedly suppressed the NaF-induced secretory response. At concentrations up to 10 mM, NaF did not increase the cellular level of cAMP, indicating that the NaF-induced amylase release is not mediated by cAMP. NaF (1-20 mM) caused a slow increase in [Ca2+]i in a concentration-dependent manner, as monitored with the fluorescent Ca2+ indicator fura-2, and the increased [Ca2+]i did not decline for at least 10 min after addition of NaF. In the absence of extracellular Ca2+, NaF evoked only a small and transient increase in [Ca2+]i. The addition of 10 mM NaF produced a significant accumulation of inositol monophosphate, inositol bisphosphate, and inositol trisphosphate. These results suggest that the NaF-induced amylase release is mediated by a breakdown of phosphoinositides leading to Ca2+ mobilization. The effects of fluoride may be through the action of F- on the GTP-binding protein(s) coupled to phospholipase C.


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