Abstract
Summary Glycine uptake by pulvinar tissues of Mimosa pudica was inhibited by citrate and this effect was reversed by addition of CaCl2 in the incubation medium. The promotive effect of calcium may occur in a definite concentration range since glycine uptake was hindered by addition of CaCl2 at concentrations higher than 10-4M in a Mes buffered medium. Functional implication of calcium was also indicated by the inhibition noted when motor tissues were Ca2+-depleted by incubation with the calcium chelators ethylenediaminetetraacetic acid (EDTA) and more specifically ethylene glycol-bis(β-aminoethyl ether)-N,N,N',N'-tetraacetic acid (EGTA), or were treated by the calcium antagonist LaCl3. By contrast, a stimulation of glycine transport was obtained after treatment with the calcium ionophore A23187. No close relationship was found between the action induced by these calcium modulators on the glycine uptake and the long-termed effects triggered on the transmembrane potential. From this, it can be argued for a particular calcium effect on the H+-glycine cotransport mechanism without affecting merely the proton motive force.
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