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Low vitamin D levels are related to MS brain atrophy, cognitive function, studies show

Date:
April 30, 2010
Source:
University at Buffalo
Summary:
Low vitamin D levels may be associated with more advanced physical disability and cognitive impairment in persons with multiple sclerosis, studies conducted by neurologists have shown.
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FULL STORY

Low vitamin D levels may be associated with more advanced physical disability and cognitive impairment in persons with multiple sclerosis, studies conducted by neurologists at the University at Buffalo have shown.

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Their results, reported at the American Academy of Neurology meeting, held earlier this month, indicated that:

  • The majority of MS patients and healthy controls had insufficient vitamin D levels.
  • Clinical evaluation and magnetic resonance imaging (MRI) images show low blood levels of total vitamin D and certain active vitamin D byproducts are associated with increased disability, brain atrophy and brain lesion load in MS patients.
  • A potential association exists between cognitive impairment in MS patients and low vitamin D levels.

The MRI study involved 236 MS patients -- 208 diagnosed with the relapsing-remitting type and 28 with secondary progressive, a more destructive form of MS -- and 22 persons without MS.

All participants provided blood serum samples, which were analyzed for total vitamin D (D2 and D3) levels as well as levels of active vitamin D byproducts. MRI scans performed within three months of blood sampling were available for 163 of the MS patients.

Results showed that only seven percent of persons with secondary-progressive MS showed sufficient vitamin D, compared to 18.3 percent of patients with the less severe relapsing-remitting type.

Higher levels of vitamin D3 and vitamin D3 metabolism byproducts (analyzed as a ratio) also were associated with better scores on disability tests, results showed, and with less brain atrophy and fewer lesions on MRI scans.

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Bianca Weinstock-Guttman, MD, UB associate professor of neurology/Jacobs Neurological Institute and director of the Baird Multiple Sclerosis Center, is first author on the study. Commenting on these results, Weinstock-Guttman said: "Clinical studies are necessary to assess vitamin D supplementation and the underlying mechanism that contributes to MS disease progression."

While lower-than-normal vitamin D status is known to be associated with a higher risk of developing MS, little is known about its relationship to cognitive impairment.

Sarah A. Morrow, MD, UB assistant research professor of neurology/Jacobs Neurological Institute and lead author on the cognitive-impairment study, compared vitamin D levels in blood samples of 136 MS patients with the results of their neuropsychological assessments that tested multiple types of cognition affected by MS.

"Results showed that MS patients who were impaired on tests of executive function -- critical reasoning and abstract thinking -- and the ability to plan and organize, were more likely to be deficient in vitamin D," said Morrow.

"This relationship held true when controlling for the season during which vitamin D was measured, as well as depression, which is known to be associated with lower vitamin D levels." Morrow noted there also was a suggestion that verbal fluency (word generation) and visual-spatial memory (learning and memory of shapes and figures) is more likely to be affected when vitamin D levels are not sufficient.

Morrow is continuing her research to clarify these relationships.

Contributors to the studies, all from UB, were: Robert Zivadinov, MD, PhD; Murali Ramanathan, PhD; Ralph Benedict, PhD; Jun Qu, PhD; Xiaotao Duan, PhD; Barbara E. Teter, PhD; David Hojnacki, MD; Eunjin Bang, Niels Bergsland, Sara Hussein, Mariya Cherneva and Laura Willis.

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Materials provided by University at Buffalo. Note: Content may be edited for style and length.


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University at Buffalo. "Low vitamin D levels are related to MS brain atrophy, cognitive function, studies show." ScienceDaily. ScienceDaily, 30 April 2010. <www.sciencedaily.com/releases/2010/04/100429153955.htm>.
University at Buffalo. (2010, April 30). Low vitamin D levels are related to MS brain atrophy, cognitive function, studies show. ScienceDaily. Retrieved October 19, 2022 from www.sciencedaily.com/releases/2010/04/100429153955.htm
University at Buffalo. "Low vitamin D levels are related to MS brain atrophy, cognitive function, studies show." ScienceDaily. www.sciencedaily.com/releases/2010/04/100429153955.htm (accessed October 19, 2022).

  • RELATED TOPICS
    • Health & Medicine
      • Vitamin D
      • Vitamin
      • Dietary Supplements and Minerals
      • Vitamin B
    • Mind & Brain
      • Multiple Sclerosis
      • Intelligence
      • Dementia
      • Psychology
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  • RELATED TERMS
    • Multiple sclerosis
    • Vitamin A
    • Learning disability
    • Excitotoxicity and cell damage
    • Cognitive neuroscience
    • Hearing impairment
    • Neurology
    • Vitamin D
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