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Figure 1


Fig. 1. HA inhibits the excitability of the XO-SG system in the isolated eyestalk preparation. (A) Schematic representation of the experimental array used to obtain simultaneous recordings from an X-organ cell body and the XO-SG tract. (B) Fluorescence micrography of the X-organ region obtained after retrograde staining of the tract OX-SG with Calcium Green-dextran. (C) Effect of HA on the spontaneous electrical activity propagated along the XO-SG tract (upper trace); note that during the HA superfusion (50 µmol l–1) most of the electrical activity was inhibited. This effect is due to the hyperpolarization evoked by HA on the X-organ cells (intracellular recording, bottom trace). (D) Hyperpolarization evoked by HA is associated with an increase in membrane conductance, indicated by reduction of the input resistance. The dotted lines indicate zero membrane potential.





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