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Enhancing Brain Adenosine Signaling With the Nucleoside Transport Blocker NBTI (S-(4-Nitrobenzyl)-6-Theoinosine) Mimics the Effects of Inescapable Shock on Later Shuttle-Escape Performance in Rats
Experience with unsignaled, inescapable shock represents a profound challenge to brain metabolic function and physiology. The authors have argued that behavioral impairment following this traumatic stress is a consequence of enhanced brain adenosine signaling, which promotes metabolic recovery by pr...
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Published in: | Behavioral neuroscience 2008-12, Vol.122 (6), p.1236-1247 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that cite this one |
Online Access: | Get full text |
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Summary: | Experience
with unsignaled, inescapable shock represents a profound challenge to brain
metabolic function and physiology. The authors have argued that behavioral
impairment following this traumatic stress is a consequence of enhanced brain
adenosine signaling, which promotes metabolic recovery by profoundly inhibiting
neural activation. The authors tested this hypothesis by artificially increasing
extracellular brain adenosine concentration by blocking uptake transport with
NBTI in rats given only restraint stress in five experiments. NBTI impaired
shuttle-escape performance in the manner of inescapable shock in a
dose-dependent manner and acted synergistically with an ineffective number of
inescapable shocks to maximally impair test performance. These deficits produced
by inescapable shock and NBTI were reversed by the nonselective adenosine
receptor antagonist caffeine, and the highly selective A
2A
receptor antagonist CSC
(8-(3-chloro-styrl)caffeine). The highly selective A
1
receptor antagonist DPCPX
(8-Cyclopentyl-1,3-Dipropylxanthine) failed to improve performance in rats
preexposed to inescapable shock or pretreated with NBTI. These data suggest that
enhanced adenosine signaling at a brain A
2A
receptor impairs escape performance following inescapable shock in
the learned helplessness paradigm. |
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ISSN: | 0735-7044 1939-0084 |
DOI: | 10.1037/a0013143 |