TH-9 (a theophylline derivative) induces long-lasting enhancement in excitatory synaptic transmission in the rat hippocampus that is occluded by frequency-dependent plasticity in vitro.

Abstract:

:Dementia, especially Alzheimer's disease, is a rapidly increasing medical condition that presents with enormous challenge for treatment. It is characterized by impairment in memory and cognitive function often accompanied by changes in synaptic transmission and plasticity in relevant brain regions such as the hippocampus. We recently synthesized TH-9, a conjugate racetam-methylxanthine compound and tested if it had potential for enhancing synaptic function and possibly, plasticity, by examining its effect on hippocampal fast excitatory synaptic transmission and plasticity. Field excitatory postsynaptic potentials (fEPSPs) were recorded in the CA1 hippocampal area of naïve juvenile male Sprague-Dawley rats using conventional electrophysiological recording techniques. TH-9 caused a concentration-dependent, long-lasting enhancement in fEPSPs. This effect was blocked by adenosine A1, acetylcholine (muscarinic and nicotinic) and glutamate (N-methyl-d-aspartate) receptor antagonists but not by a γ-aminobutyric acid receptor type B (GABA(B)) receptor antagonist. The TH-9 effect was also blocked by enhancing intracellular cyclic adenosine monophosphate and inhibiting protein kinase A. Pretreatment with TH-9 did not prevent the induction of long-term potentiation (LTP) or long-term depression (LTD). Conversely, induction of LTP or LTD completely occluded the ability of TH-9 to enhance fEPSPs. Thus, TH-9 utilizes cholinergic and adenosinergic mechanisms to cause long-lasting enhancement in fEPSPs which were occluded by LTP and LTD. TH-9 may therefore employ similar or convergent mechanisms with frequency-dependent synaptic plasticities to produce the observed long-lasting enhancement in synaptic transmission and may thus, have potential for use in improving memory.

journal_name

Neuroscience

journal_title

Neuroscience

authors

Nashawi H,Bartl T,Bartl P,Novotny L,Oriowo MA,Kombian SB

doi

10.1016/j.neuroscience.2012.06.028

subject

Has Abstract

pub_date

2012-09-18 00:00:00

pages

70-84

eissn

0306-4522

issn

1873-7544

pii

S0306-4522(12)00628-8

journal_volume

220

pub_type

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