Abstract
Subjects with metabolic syndrome (MetS) often show worse cognitive performance compared with the healthy population. We investigated whether microstructural white matter abnormalities are associated with cognitive performance in adults with MetS using diffusion tensor MR imaging. A total of 32 subjects with MetS (age 64.8 ± 7.8, 56.25 % female) and 23 age-, gender-, and education-matched healthy controls completed a battery of neuropsychological tests and diffusion tensor imaging (DTI) at 3-T MRI. Brain global and regional volumes, white matter fractional anisotropy (FA), mean diffusivity (MD), radial diffusivity (RD), and axial diffusivity (LD) were calculated. The least-square models adjusted for age, sex, HbA1c, hypertension, body mass index, hyperlipidemia, and white matter hyperintensities were used to evaluate the relationship between cognitive function and DTI. The MetS group had worse performance in verbal fluency (VF) and learning and memory function (total VF: T score (p = 0.01), VF: animals T score (p = 0.0001), Hopkins Verbal Learning Test (HVLT): Total recall T score (p = 0.0001), and HVLT: delayed recall T score (p = 0.002), as compared with controls. In the MetS group, abnormalities in diffusivity measures were associated with worse cognitive performance [VF: animals T score and left post-central gyrus-LD (p = 0.0007, r adj 0.4), R angular gyrus-RD (p = 0.0008, r adj 0.3), L supra-marginal gyrus-RD (p = 0.009, r adj 0.2) after adjusting for age, sex, HbA1c, 24 h mean BP, presence of hyperlipidemia, and global white matter hyperintensities]. Microstructural white matter abnormalities in the MetS group might be the underlying mechanisms of worse verbal learning and memory performance.
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Acknowledgments
The study was supported by NIH-NIA 1R01- AG0287601A2, NIH-NIDDK 5R21 DK084463, 1R01DK13902-01A1, American Diabetes Association, Clinical 1-03-CR-23 and 1-06-CR-25 to Dr. Vera Novak. The project described was supported by Grant Number UL1 RR025758-Harvard Clinical and Translational Science Center and M01-RR-01032, from the National Center for Research Resources.
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Dr. Freddy Alfaro reports no disclosures. Dr. Vasileios-Arsenios Lioutas reports no disclosures. Dr. Daniela Pimentel reports no disclosures. Dr. Chen-Chih Chung reports no disclosures. Dr. Francisco Bedoya reports no disclosures. Dr. Woo-Kyoung Woo Ph.D. reports no disclosures. Dr. Vera Novak M.D. Ph.D. was funded by NIH-NIA 1R01- AG0287601A2, NIH-NIDDK 5R21 DK084463, NIH-NIDDK 1R01DK13902-01A1, American Diabetes Association, Clinical 1-03-CR-23 and 1-06-CR-25.
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All subjects that met inclusion/exclusion criteria signed an Informed consent form (ICF) as approved by the Institutional review board (IRB) at Beth Israel Deaconess Medical Center.
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F. J. Alfaro and V.-A. Lioutas contributed equally to the manuscript.
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Alfaro, F.J., Lioutas, VA., Pimentel, D.A. et al. Cognitive decline in metabolic syndrome is linked to microstructural white matter abnormalities. J Neurol 263, 2505–2514 (2016). https://doi.org/10.1007/s00415-016-8292-z
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DOI: https://doi.org/10.1007/s00415-016-8292-z