Calcium D-pantothenate (Ca D-P) and calcium D-homopantothenate (Ca D-HP) (pantogam) exhibiting antagonism in a number tests of pharmacological screening were shown to inhibit the absorption of [14C]-GABA (0.2 microM) by the rat brain cortex slices (3 mm) incubated in calcium-free medium. The effect of Ca D-HP manifests at its low concentrations (10(-6) M) and that of Ca D-P at high concentrations (10(-6) M). The data obtained are discussed in relation to the possible influence of the anion and cation components of the studied compounds.
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