Facilitatory role of somatostatin via muscarinic cholinergic system in the generation of long-term potentiation in the rat dentate gyrus in vivo.

Abstract:

:We investigated whether somatostain modulates the generation of long-term potentiation (LTP) in rat perforant path-dentate gyrus synapse in vivo. When somatostatin was injected intracerebroventricularly (i.c.v.) 20 min prior to the tetanus, the intensity of LTP increased dose dependently. Synaptic potential evoked by a low-frequency test stimulation, however, was not altered by somatostatin. We next tested whether the LTP-augmenting effect of somatostain is mediated by cholinergic activation, because somatostatin was demonstrated to promote acetylcholine release in rat hippocampal slice. Pirenzepine (50 nmol/rat), a muscarinic M1 receptor antagonist, did not affect the tetanus-induced LTP by itself. But when it was co-applicated with the somatostatin (50 ng/rat) 20 min before tetanus, it completely abolished the LTP-augmenting effect of somatostatin. Then we examined the effect of octreotide, a potent agonist specifically binding to somatostatin receptor subtypes 2 and 4, on the generation of LTP. Octreotide (500 ng/rat) also facilitated the intensity of LTP. These results suggest that somatostatin facilitates the generation of perforant path-dentate gyrus granule cell LTP by activating the muscarinic cholinergic receptor and the effect of somatostatin is induced, at least partly, by somatostatin receptor subtypes 2 and 4 in vivo.

journal_name

Brain Res

journal_title

Brain research

authors

Nakata A,Saito H,Nishiyama N

doi

10.1016/0006-8993(96)00233-8

subject

Has Abstract

pub_date

1996-06-03 00:00:00

pages

135-40

issue

1-2

eissn

0006-8993

issn

1872-6240

pii

0006-8993(96)00233-8

journal_volume

723

pub_type

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