Dose- and time-response effects of pantethine on open-field behavior, and on central neurotransmission in rats.

In this study the dose- and time-related effects of pantethine on open-field behavior and central neurotransmissions were investigated in rats. Pantethine administered in low doses (0.48-0.96 mM/kg SC) only marginally influenced the activity of the animals, but induced a significant decrease of hypothalamic noradrenaline level without influencing the concentrations of dopamine and DOPAC. Injected in higher doses (1.95-3.90 mM/kg SC), the compound produced a marked depression of both open-field activity and noradrenaline levels, but increased the concentrations of dopamine and DOPAC in the hypothalamus. Twelve hr after the administration of the substance, its effect was attenuated, and 24 hr after the treatment neither the behavioral nor the monoamine parameters differed significantly from the control values. Concerning the somatostatin, pantethine administered in high doses (1.95-3.90 mM/kg SC) decreased the striatal concentration of somatostatin 4 hr after the injection, and this effect was attenuated 24 hr after the treatment. These data suggest that the pantethine-induced behavioral changes are correlated with its effect on central catecholaminergic and somatostatinergic transmission.