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Related Experiment Videos

Folate deficiency increases postischemic brain injury.

Matthias Endres1, Michael Ahmadi, Inna Kruman

  • 1Department of Neurology, Charité Hospital, Humboldt University, Berlin, Germany. matthias.endres@charite.de

Stroke
|December 31, 2004
PubMed
Summary

Folate deficiency increases stroke risk by promoting DNA damage and larger brain injuries after ischemia. This occurs due to higher homocysteine levels and oxidative DNA damage, worsening stroke outcomes.

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Area of Science:

  • Neuroscience
  • Vascular Biology
  • Genetics

Background:

  • Folate deficiency and hyperhomocysteinemia are linked to impaired vascular function and increased stroke risk.
  • The precise mechanisms by which folate deficiency exacerbates brain injury after stroke are not fully understood.

Purpose of the Study:

  • To investigate the hypothesis that folate deficiency and elevated homocysteine levels promote DNA damage and increase brain injury following cerebral ischemia/reperfusion.
  • To assess the impact of folate deficiency on oxidative DNA damage and lesion size in a mouse model of stroke.

Main Methods:

  • 129/Sv mice, including uracil-DNA glycosylase-deficient (Ung-/-) and wild-type (Ung+/+) littermates, were fed a folate-deficient diet for 3 months.
  • Mice were subjected to middle cerebral artery (MCA) occlusion for 30 minutes followed by reperfusion.

Related Experiment Videos

  • Neurological deficits, infarct size, plasma homocysteine levels, and oxidative DNA damage (abasic sites) were measured.

    • Main Results:

    • Folate-deficient mice exhibited 6- to 10-fold higher plasma homocysteine levels compared to controls.
    • Cerebral lesion volumes and neurological deficits were significantly increased (2.1-fold) in folate-deficient mice after MCA occlusion/reperfusion.
    • Oxidative DNA damage, indicated by abasic sites, was significantly elevated in the ischemic brain of folate-deficient animals, and folate deficiency exacerbated lesion size in Ung-/- mice.

    Conclusions:

    • Folate deficiency and hyperhomocysteinemia significantly increase oxidative DNA damage and exacerbate ischemic brain injury after stroke.
    • These findings highlight the critical role of folate in protecting against stroke-related brain damage.