Â© Freund & Pettman, U.K. , 14, 285-301 (2003) Anna Binaschi, Gianni Bregola and Michele Simonato Department of Clinical and Experimental Medicine, Section of Pharmacology, and Neuroscience Center, University of Ferrara, Ferrara, Italy SYNOPSIS The role of the hippocampal somatostatin (somatotropin release-inhibiting factor, SRIF) system in the control of partial complex seizures is discussed in this review. The SRIF system plays a role in the inhibitory modulation of hippocampal circuitries under normal conditions: 1) SRIF neurons in the dentate gyrus are part of a negative feedback circuit modulating the firing rate of granule cells; 2) SRIF released in CA3 interacts both with presynaptic receptors located on associational/commissural terminals and with postsynaptic receptors located on pyramidal cell dendrites, reducing excitability of pyramidal neurons; 3) in CA1, SRIF exerts a feedback inhibition and reduces the excitatory drive on pyramidal neurons. Significant changes in the hippocampal SRIF system have been documented in experimental models of temporal lobe epilepsy (TLE), in particular in the kindling and in the kainate models. SRIF biosynthesis and release are increased in the kindled hippocampus, especially in the dentate gyrus. This hyper-function may be instrumental to control the latent hyperexcitability of the kindled brain, preventing excessive discharge
Reviews in the Neurosciences – de Gruyter
Published: Apr 1, 2003
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