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Title:
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Neurotrophin receptor p75NTR mediates Huntington's disease-associated synaptic and memory dysfunction
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Author:
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Brito, Verónica; Giralt Torroella, Albert; Enriquez-Barreto, Lilian; Puigdellívol Cañadell, Maria del Mar; Suelves Caballol, Núria; Zamora-Moratalla, Alfonsa; Ballesteros, Jesús J.; Martín, Eduardo D.; Dominguez-Iturza, Nuria; Morales, Miguel; Alberch i Vié, Jordi; Ginés Padrós, Silvia
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Notes:
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Learning and memory deficits are early clinical manifestations of Huntington's disease (HD). These cognitive impairments have been mainly associated with frontostriatal HD pathology; however, compelling evidence provided by several HD murine models suggests that the hippocampus may contribute to synaptic deficits and memory dysfunction in HD. The neurotrophin receptor p75(NTR) negatively regulates spine density, which is associated with learning and memory; therefore, we explored whether disturbed p75(NTR) function in the hippocampus could contribute to synaptic dysfunction and memory deficits in HD. Here, we determined that levels of p75(NTR) are markedly increased in the hippocampus of 2 distinct mouse models of HD and in HD patients. Normalization of p75(NTR) levels in HD mutant mice heterozygous for p75(NTR) prevented memory and synaptic plasticity deficits and ameliorated dendritic spine abnormalities, likely through normalization of the activity of the GTPase RhoA. Moreover, viral-mediated overexpression of p75(NTR) in the hippocampus of WT mice reproduced HD learning and memory deficits, while knockdown of p75(NTR) in the hippocampus of HD mice prevented cognitive decline. Together, these findings provide evidence of hippocampus-associated memory deficits in HD and demonstrate that p75(NTR) mediates synaptic, learning, and memory dysfunction in HD. |
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Subject(s):
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-Corea de Huntington
-Genètica mèdica
-Fisiologia patològica
-Trastorns de la memòria
-Hipocamp (Cervell)
-Rates (Animals de laboratori)
-Huntington's chorea
-Medical genetics
-Pathological physiology
-Memory disorders
-Hippocampus (Brain)
-Rats as laboratory animals |
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Rights:
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(c) American Society for Clinical Investigation, 2014
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Document type:
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Article
Article - Published version |
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Published by:
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American Society for Clinical Investigation
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