Kitada Y
Jpn J Physiol. 1978;28(4):413-22. doi: 10.2170/jjphysiol.28.413.
The effects of various cations on water fibers in the frog (Rana catesbeiana) tongue were investigated. The following results were obtained. 1. Water fibers responded well to Ca2+ and Sr2+. 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. 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+. 4. The Ca2+ response was inhibited by various cations. The order of the inhibitory effects of cations was as follows: La3+ greater than Mn2+ = Mg2+ greater than or equal to Ni2+ greater than Co2+ greater than monovalent cations (Na+, K+, NH4+ and choline+). 5. The Sr2+ response, as well as the Ca2+ response, was inhibited by Na+ and Mg2+.
研究了多种阳离子对牛蛙（Rana catesbeiana）舌部水纤维的影响。得到以下结果：1. 水纤维对Ca2+和Sr2+反应良好。2. SO2-(4)不抑制Ca2+反应。高浓度的Cl-对高Ca2+刺激的反应有抑制作用。然而，当Ca2+浓度较低时，Cl-不会产生任何抑制作用。因此，采用低Ca2+刺激（0.1 mM CaCl2）来检测阳离子的抑制作用。3. MgCl2和MgSO4强烈抑制对低Ca2+刺激的反应。镁盐的抑制作用不是由阴离子引起的，而是由Mg2+引起的。4. Ca2+反应受到各种阳离子的抑制。阳离子抑制作用的顺序如下：La3+＞Mn2+ = Mg2+≥Ni2+＞Co2+＞单价阳离子（Na+、K+、NH4+和胆碱+）。5. Sr2+反应以及Ca2+反应均受到Na+和Mg2+的抑制。
