ArticleBrain and behavior2026
Association Between Glymphatic Function and White Matter Microstructural Injury in Patients With Cushing's Disease.
Article in Brain and behavior, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
objectivePatients with Cushing's disease (CD) exhibit white matter (WM) microstructural injury, yet the underlying mechanisms remain incompletely understood. This study aims to investigate the role of glymphatic function in WM damage among patients with CD.
methodsA total of 69 patients with CD and 64 healthy controls(HC) were enrolled. Glymphatic system function was evaluated using the diffusion tensor image analysis along the perivascular space (DTI-ALPS) index. WM microstructural injury across 42 tracts was assessed via fractional anisotropy (FA) and mean diffusivity (MD). Serum cortisol levels were quantified using chemiluminescence immunoassay.
resultsCompared with HC, patients with CD exhibited significantly reduced DTI-ALPS indices (p = 0.026). Widespread WM microstructural injury was observed, characterized by decreased FA in 25 tracts and increased MD in 40 tracts. Correlation analyses revealed that in patients with CD, the DTI-ALPS index showed a significant positive correlation with FA values of the right superior longitudinal fasciculus III (SLF III_R; r = 0.42, p = 0.033) and a significant negative correlation with 00:00 cortisol levels (r = -0.354, p = 0.004). Furthermore, mediation analysis confirmed that the DTI-ALPS index fully mediated the effect of 00:00 cortisol level on the reduction of FA in the SLF III_R (ACME = -0.138, 95% CI: [-0.319, -0.013], p = 0.021).
conclusionThis study provides the first evidence of glymphatic functional impairment in patients with CD. Our findings suggest that aberrantly elevated midnight cortisol levels serve as a primary driver of this glymphatic functional impairment. Furthermore, this impaired glymphatic function fully mediates the impact of 00:00 cortisol levels on microstructural injury to the SLF III_R.
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