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Long-term continuous allopregnanolone elevation causes memory decline and hippocampus shrinkage, in female wild-type B6 mice.
Bengtsson, Sara K S; Johansson, Maja; Bäckström, Torbjörn.
Afiliação
  • Bengtsson SK; Umeå Neurosteroid Research Center, Umeå University, Department of Clinical Sciences, Umeå, Sweden. Electronic address: sara.bengtsson@obgyn.umu.se.
  • Johansson M; Umeå Neurosteroid Research Center, Umeå University, Department of Clinical Sciences, Umeå, Sweden; Umecrine Cognition AB, Umeå, Sweden.
  • Bäckström T; Umeå Neurosteroid Research Center, Umeå University, Department of Clinical Sciences, Umeå, Sweden.
Horm Behav ; 78: 160-7, 2016 Feb.
Article em En | MEDLINE | ID: mdl-26497250
Chronic stress in various forms increases the risk for cognitive dysfunction, dementia and Alzheimer's disease. While the pathogenesis behind these findings is unknown, growing evidence suggests that chronic increase in neurosteroid levels, such as allopregnanolone, is part of the mechanism. We treated wild-type C57BL/6J mice with allopregnanolone for 5months, using osmotic pumps. This treatment led to moderately increased levels of allopregnanolone, equivalent to that of mild chronic stress. After an interval of no treatment for 1month, female mice showed impaired learning and memory function in the Morris water maze (MWM) in combination with diminished hippocampus weight and increased cerebellum weight, both correlating to MWM performance. Male mice showed a minor reduction in memory function and no differences in brain structure. We conclude that chronic allopregnanolone elevation can lead to cognitive dysfunction and negative brain alterations. We suggest that allopregnanolone could play a key role in the pathogenesis of stress-induced cognitive disturbances and perhaps dementia.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Tamanho do Órgão / Pregnanolona / Neurotransmissores / Aprendizagem em Labirinto / Hipocampo / Transtornos da Memória Tipo de estudo: Etiology_studies Limite: Animals Idioma: En Ano de publicação: 2016 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Tamanho do Órgão / Pregnanolona / Neurotransmissores / Aprendizagem em Labirinto / Hipocampo / Transtornos da Memória Tipo de estudo: Etiology_studies Limite: Animals Idioma: En Ano de publicação: 2016 Tipo de documento: Article