4.0 Article

A mixed polyunsaturated fatty acid diet normalizes hippocampal neurogenesis and reduces anxiety in serotonin transporter knockout rats

Journal

BEHAVIOURAL PHARMACOLOGY
Volume 22, Issue 4, Pages 324-334

Publisher

LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/FBP.0b013e328347881b

Keywords

anxiety; hippocampus; n-3 polyunsaturated fatty acid neurogenesis; rat; serotonin

Funding

  1. The Netherlands Organization for Scientific Research (NWO) [864.10.003]

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The aim of this study was to investigate the effects of a mixed dietary intervention on behavioral symptoms in serotonin transporter knockout (5-HTT-/-) rats modeling the human 5-HTT length polymorphic region short-allele. Twenty female 5-HTT-/- and 19 wild-type (5-HTT+/+) rats were fed for 3 months on a mixed polyunsaturated fatty acid (PUFA) diet comprising n-3 PUFAs, B vitamins and phospholipids, or an isocaloric control diet, and a subgroup was subsequently tested in an array of anxiety-related behavioral tests. All brains were harvested and immunostained for doublecortin, a neurogenesis marker. In addition, hippocampal volume was measured. 5-HTT-/- rats on the control diet displayed increased anxiety-related behavioral responses, and impaired fear extinction. These effects were completely offset by the mixed PUFA diet, whereas this diet had no behavioral effect in 5-HTT+/+ rats. In parallel, dentate gyrus doublecortin immunoreactivity was increased in 5-HTT-/- rats fed on the control diet, which was reversed by the mixed PUFA diet. Hippocampal volume was unaffected by the mixed PUFA diet in 5-HTT-/- subjects, whereas it increased in 5-HTT+/+ rats. We conclude that a mixed n-3 PUFA diet ameliorates anxiety-related symptoms in a genotype-dependent manner, potentially by normalizing neurogenesis. We suggest that such a mixed diet may serve as an attractive adjuvant to treat anxiety in 5-HTT length polymorphic region short-allele carriers. Behavioural Pharmacology 22:324-334 (C) 2011 Wolters Kluwer Health vertical bar Lippincott Williams & Wilkins.

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