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Behav Brain Res ; 267: 133-43, 2014 Jul 01.
Article in English | MEDLINE | ID: mdl-24680988

ABSTRACT

BACKGROUND: Epidemiological studies have shown associations between vitamin D, mental health and glucose homeostasis in the elderly. Causal evidence, however, is still lacking. OBJECTIVE: The objective of this study was to investigate the importance of vitamin D in the prevention of emotional disturbances and cognitive decline in aging C57BL/6 mice, with pre-diabetes type II as potential effect modifier. METHODS: Mice were exposed to one of four diets from 10 months till 24 months of age: low fat vitamin D adequate (LFD), LF vitamin D deficient (LF), moderate fat vitamin D adequate (MFD), and MF vitamin D deficient (MF). The MFD/MF diet was applied to induce a condition resembling pre-diabetes type II. Behavior was assessed twice in the same group of mice at 6-8 and at 22-23 months of age using the Open Field Test (OFT), Elevated Plus Maze (EPM), Object Recognition Test (ORT) and the Morris Water Maze (MWM). RESULTS: We successfully induced vitamin D deficiency in the LF/MF mice. Moreover, fasting glucose and fasting insulin levels were significantly higher in MFD/MF mice than in LFD/LF mice. A significant aging effect was observed for most behavioral parameters. A MF(D) diet was shown to delay or prevent the age-related increase in emotional reactivity in the EPM. No effect of vitamin D or vitamin D*fat on behavioral outcomes was measured. CONCLUSION: Aging significantly affected emotional reactivity and cognitive performance. Although other studies have shown effects of vitamin D on emotional reactivity and cognitive performance in mice, these findings could not be confirmed in aged C57BL/6 mice in this study.


Subject(s)
Affective Symptoms/physiopathology , Aging/physiology , Cognition Disorders/physiopathology , Diet , Vitamin D Deficiency/physiopathology , Animals , Blood Glucose , Body Weight , Cognition/physiology , Dietary Fats/administration & dosage , Emotions/physiology , Fasting/blood , Insulin/blood , Male , Maze Learning/physiology , Mice, Inbred C57BL , Random Allocation , Recognition, Psychology/physiology , Survival Analysis , Vitamin D/administration & dosage
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