PPubMed18 Jul 2021Cited 18×

Effects of simvastatin on white matter integrity in healthy middle‐aged adults Effects of Simvastatin on White Matter Integrity VOGT <i> et al </i> .

Nicholas M. Vogt, Jack F. V. Hunt, Yue Ma, Carol A. Van Hulle, Nagesh Adluru, Richard J. Chappell, Karen K. Lazar, Laura E Jacobson, Benjamin P. Austin, Sanjay Asthana, Sterling C. Johnson, Barbara B. Bendlin, Cynthia M. Carlsson

Abstract

The brain is the most cholesterol-rich organ and contains nearly a quarter of total body cholesterol. Within the brain, cholesterol exists in two primary pools-approximately 70% of brain cholesterol is found in myelin sheaths and the remainder is located in the cell membranes of neurons and astrocytes. Cholesterol is required for myelination and contributes to the insulating properties of mature myelin by reducing ion permeability. Cholesterol homeostasis in the brain is independent of peripheral cholesterol metabolism and is maintained by complex regulatory mechanisms. Because the blood-brain

A figure from Effects of simvastatin on white matter integrity in healthy middle‐aged adults Effects of Simvastatin on White Matter Integrity VOGT <i> et al </i> . — fig. from the paper

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Simvastatin preserves white‑matter microstructure and volume over 18 months in healthy middle‑aged adults.

What’s new

i.Demonstrated that simvastatin treatment preserves white‑matter fractional anisotropy, radial diffusivity, and volume in healthy middle‑aged adults
ii.Showed that approximately 30% of the white‑matter benefit is mediated by reductions in serum total cholesterol
iii.Provided longitudinal neuroimaging data from a double‑blind, placebo‑controlled 18‑month randomized trial of simvastatin 40 mg daily

How they did it

Seventy‑three statin‑naïve adults (age 40‑72) were randomized to simvastatin 40 mg daily (n=35) or matching placebo (n=38) for 18 months. MRI diffusion‑weighted and structural scans were obtained at baseline, 6, 12, and 18 months; ANCOVA models (covariates age, sex, APOE‑ɛ4) assessed percent change in white‑matter, gray‑matter, and WM‑hyperintensity measures. Voxel‑wise TBSS and mediation analyses linked cholesterol change to white‑matter outcomes.

What they found

FA preserved: adjusted group difference 0.88% (95% CI 0.27–1.50), P = 0.005 at 18 months
Radial diffusivity reduced: adjusted difference −1.10% (95% CI −2.13 to −0.06), P = 0.039
White‑matter volume increased: adjusted difference 0.72% (95% CI 0.13–1.32), P = 0.018
Serum total cholesterol mediated ~30% of the simvastatin effect on white‑matter microstructure
No significant effects on gray‑matter or white‑matter hyperintensity volume

Caveats

✕Small sample size (n = 73) limits statistical power
✕Participants were racially homogeneous and all had a parental history of Alzheimer’s disease, reducing generalizability
✕Study duration was 18 months; long‑term sustainability and cognitive outcomes remain unknown

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