[Effect of baclofen on calcium channel currents in dorsal sensory cells of the lamprey spinal cord].

delta-Baclofen reduced the peak amplitude of the barium current in the DSCs from Lunicuspis and L.fluviatilis. The membrane conductance was not altered either by baclofen or GABA.

[Calcium current and GABA(B) receptors in dorsal sensory cells of the lamprey spinal cord].

GABA and GABAB receptor agonists were shown to reduce the peak calcium current amplitude with its subsequent recovery, whereas glycine and taurine, the GABAA receptor agonists, did not modify the current. The findings suggest that the GABAB receptors mediate a presynaptic inhibition by suppression of the Calcium currents in the cyclostome spinal cord.