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KMID : 0848120060310030099
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International Journal of Oral Biology
2006 Volume.31 No. 3 p.99 ~ p.105
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Cholinergic and Neurokinergic Agonist-induced Ca2+ Responses in Rat von Ebner’s Gland Acinar Cells
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Chung Ki-Myung
Kim Sang-Hee
Cho Young-Kyung
Roper Stephen D.
Kim Kyung-Nyun
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Abstract
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Von Ebner’s glands (vEG) are minor salivary glands associated with circumvallate and foliate papilla. The secretions of vEG consist of microenvironment of the taste buds in the circumvallate and foliate papillae, and thus saliva from vEG plays a role in the perception of taste. The Ca²+ signaling system in rat vEG acinar cell was examined using the Ca²+-sensitive fluorescent indicator Fura-2. Agonist-induced increase in intracellular Ca²+([Ca²+]i) was stimulated by carbachol (CCh) and substance P (SP), but not by norepinephrine (NE), and recovered to control levels by their receptor antagonists dose-dependently. The effects were also observed in Ca²+-free medium, suggesting mobilization from intracellular Ca²+ store. These results in the vEG acinar cell indicate that 1) [Ca²+]i is at least regulated by muscarinic and neurokininergic (NK1) receptors; 2) the increases in [Ca²+]i activated by CCh and SP are mainly mediated by discharge of cytosolic calcium pool.
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KEYWORD
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Carbachol, Norepinephrine, Substance P, von Ebner’s glands, Calcium, Fura-2
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