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The PDE4 inhibitor rolipram reverses object memory impairment induced by acute tryptophan depletion in the rat

RATIONALE: The selective type IV phosphodiesterase inhibitor, rolipram, has been shown to improve long-term memory and can reverse the cholinergic deficit caused by scopolamine. However, the underlying mechanisms of action of rolipram remain obscure. OBJECTIVES: The present study investigates the ef...

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Autores principales: Rutten, K., Lieben, C., Smits, L., Blokland, A.
Formato: Texto
Lenguaje:English
Publicado: Springer-Verlag 2007
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1915617/
https://www.ncbi.nlm.nih.gov/pubmed/17265077
http://dx.doi.org/10.1007/s00213-006-0697-4
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author Rutten, K.
Lieben, C.
Smits, L.
Blokland, A.
author_facet Rutten, K.
Lieben, C.
Smits, L.
Blokland, A.
author_sort Rutten, K.
collection PubMed
description RATIONALE: The selective type IV phosphodiesterase inhibitor, rolipram, has been shown to improve long-term memory and can reverse the cholinergic deficit caused by scopolamine. However, the underlying mechanisms of action of rolipram remain obscure. OBJECTIVES: The present study investigates the effect of rolipram in a serotonergic-deficit model of acute tryptophan depletion (ATD). In addition, the levels of plasma tryptophan (TRP) were compared to object recognition performance. MATERIALS AND METHODS: The experiments were conducted using male Wistar rats. The time-dependent effect of ATD treatment (a gelatin-based protein mixture) on plasma TRP levels (0, 1, 3, and 6 h after injection) and object recognition task (ORT) performance (0.5, 1, 3, and 6 h after ATD treatment) was examined. The effect of rolipram (0, 0.01, 0.03, and 0.1 mg/kg, i.p.) was tested in the condition in which ATD induced a clear memory deficit. RESULTS: ATD significantly lowered the plasma TRP ratio (TRP/Σlarge neutral amino acid) with a maximum of 48%, approximately 1 h after administration. Furthermore, ATD impairs ORT performance when administered 3 h before testing. Rolipram (0.1 mg/kg) reversed the memory deficit induced by ATD in a dose-dependent manner. CONCLUSIONS: On the basis of previous studies and the ability to reverse a serotonergic deficit, we suggest that rolipram may act through elevation of cyclic adenosine monophosphate levels and subsequent increase in neurotransmitter release.
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spelling pubmed-19156172007-07-13 The PDE4 inhibitor rolipram reverses object memory impairment induced by acute tryptophan depletion in the rat Rutten, K. Lieben, C. Smits, L. Blokland, A. Psychopharmacology (Berl) Original Investigation RATIONALE: The selective type IV phosphodiesterase inhibitor, rolipram, has been shown to improve long-term memory and can reverse the cholinergic deficit caused by scopolamine. However, the underlying mechanisms of action of rolipram remain obscure. OBJECTIVES: The present study investigates the effect of rolipram in a serotonergic-deficit model of acute tryptophan depletion (ATD). In addition, the levels of plasma tryptophan (TRP) were compared to object recognition performance. MATERIALS AND METHODS: The experiments were conducted using male Wistar rats. The time-dependent effect of ATD treatment (a gelatin-based protein mixture) on plasma TRP levels (0, 1, 3, and 6 h after injection) and object recognition task (ORT) performance (0.5, 1, 3, and 6 h after ATD treatment) was examined. The effect of rolipram (0, 0.01, 0.03, and 0.1 mg/kg, i.p.) was tested in the condition in which ATD induced a clear memory deficit. RESULTS: ATD significantly lowered the plasma TRP ratio (TRP/Σlarge neutral amino acid) with a maximum of 48%, approximately 1 h after administration. Furthermore, ATD impairs ORT performance when administered 3 h before testing. Rolipram (0.1 mg/kg) reversed the memory deficit induced by ATD in a dose-dependent manner. CONCLUSIONS: On the basis of previous studies and the ability to reverse a serotonergic deficit, we suggest that rolipram may act through elevation of cyclic adenosine monophosphate levels and subsequent increase in neurotransmitter release. Springer-Verlag 2007-01-30 2007-06 /pmc/articles/PMC1915617/ /pubmed/17265077 http://dx.doi.org/10.1007/s00213-006-0697-4 Text en © Springer-Verlag 2007
spellingShingle Original Investigation
Rutten, K.
Lieben, C.
Smits, L.
Blokland, A.
The PDE4 inhibitor rolipram reverses object memory impairment induced by acute tryptophan depletion in the rat
title The PDE4 inhibitor rolipram reverses object memory impairment induced by acute tryptophan depletion in the rat
title_full The PDE4 inhibitor rolipram reverses object memory impairment induced by acute tryptophan depletion in the rat
title_fullStr The PDE4 inhibitor rolipram reverses object memory impairment induced by acute tryptophan depletion in the rat
title_full_unstemmed The PDE4 inhibitor rolipram reverses object memory impairment induced by acute tryptophan depletion in the rat
title_short The PDE4 inhibitor rolipram reverses object memory impairment induced by acute tryptophan depletion in the rat
title_sort pde4 inhibitor rolipram reverses object memory impairment induced by acute tryptophan depletion in the rat
topic Original Investigation
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1915617/
https://www.ncbi.nlm.nih.gov/pubmed/17265077
http://dx.doi.org/10.1007/s00213-006-0697-4
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