B-vitamin deficiency causes hyperhomocysteinemia and vascular cognitive impairment in mice

Aron M. Troen, Melissa Shea-Budgel, Barbara Shukitt-Hale, Donald E. Smith, Jacob Selhub, Irwin H. Rosenberg

Research output: Contribution to journalArticlepeer-review

158 Scopus citations

Abstract

In older adults, mildly elevated plasma total homocysteine (hyperhomocysteinemia) is associated with increased risk of cognitive impairment, cerebrovascular disease, and Alzheimer's disease, but it is uncertain whether this is due to underlying metabolic, neurotoxic, or vascular processes. We report here that feeding male C57BL6/J mice a B-vitamin-deficient diet for 10 weeks induced hyperhomocysteinemia, significantly impaired spatial learning and memory, and caused a significant rarefaction of hippocampal microvasculature without concomitant gliosis and neurodegeneration. Total hippocampal capillary length was inversely correlated with Morris water maze escape latencies (r = -0.757, P < 0.001), and with plasma total homocysteine (r = -0.631, P = 0.007). Feeding mice a methionine-rich diet produced similar but less pronounced effects. Our findings suggest that cerebral microvascular rarefaction can cause cognitive dysfunction in the absence of or preceding neurodegeneration. Similar microvascular changes may mediate the association of hyperhomocysteinemia with human age-related cognitive decline.

Original languageAmerican English
Pages (from-to)12474-12479
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume105
Issue number34
DOIs
StatePublished - 26 Aug 2008
Externally publishedYes

Keywords

  • Cerebrovascular
  • Homocysteine
  • Mouse
  • Nutrition

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