Inhibitory Effects of Cations on the Ca2+ Response of Water Fibers in the Frog Tongue

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  • 北田 泰之
    Department of Physiology, Niigata University School of Dentistry

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  • Inhibitory Effects of Cations on the Ca<SUP>2+</SUP> Response of Water Fibers in the Frog Tongue
  • Inhibitory Effects of Cations on the Ca

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The effects of various cations on water fibers in the frog (Ranacatesbeiana) tongue were investigated. The following results were obtained.<BR>1. Water fibers responded well to Ca2+ and Sr2+<BR>2. SO2-4 did not inhibit the Ca2+ response. Cl- at high concentrations had an inhibitory effect on the response to high. Ca2+ stimulation. However, when the Ca2+ concentration was low, Cl- did not induce any inhibition. Therefore, low Ca2+ stimulation (0.1 mM CaCl2) was used to examine the inhibitory effect of cation.<BR>3. MgCl2 and MgSO4 strongly inhibited the response to low Ca2+ stimulation. The inhibition by Mg salts was not caused by anion but by Mg2+.<BR>4. The Ca2+ response was inhibited by various cations. The order of the inhibitory effects of cations was as follows: La3+ >Mn2+=Mg2+≥Ni2+ > Co2+ > monovalent cations (Na+, K+, NH4+ and choline+).<BR>5. The Sr2+ response, as well as the Ca2+ response, was inhibited by Na+and Mg2+.

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