Increased Brain Iron Deposition in the Putamen in Patients with Type 2 Diabetes Mellitus Detected by Quantitative Susceptibility Mapping

Abstract

Background. The underlying brain structural changes in type 2 diabetes mellitus (T2DM) patients have attracted increasing attention. The insulin-resistant state causes iron overload in neurons and leads to lesions in the central nervous system. Quantitative susceptibility mapping (QSM) can provide a noninvasive quantitative analysis of brain iron deposition. We aimed to compare the difference of brain iron deposition in the gray matter nucleus between T2DM patients and healthy elderly individuals using QSM. Methods. Thirty-two T2DM patients and thirty-two age- and gender-matched healthy controls (HCs) were enrolled in this research. Twenty-three patients and twenty-six HCs underwent cognitive assessments. Brain QSM maps were computed from multiecho GRE data using morphology-enabled dipole inversion with automatic uniform cerebrospinal fluid zero reference algorithm (MEDI+0). ITK-SNAP was used to measure the susceptibility values reflecting the content of iron in the regions of interest (ROIs). Results. The study included thirty-two T2DM patients (20 males and 12 females; mean age of 61.09±9.99 years) and 32 HCs (14 males and 18 females; mean age of 59.09±9.77 years). These participants had no significant difference in age or gender (P>0.05). Twenty-three patients with T2DM (11 males and 12 females; mean age, 64.65±8.44 years) and twenty-six HCs (14 males and 12 females; mean age, 62.30±6.13 years) received an assessment of cognitive function. T2DM patients exhibited an obviously (t=3.237, P=0.003) lower Montreal Cognitive Assessment (MoCA) score (26.78±2.35; HCs, 28.42±0.64; normal standard ≥26) and a higher Stroop color-word test (SCWT)-C score [87(65,110); HC, 63(60,76.75), Z=−2.232, P=0.003] than HCs. The mean susceptibility values in the putamen appeared obviously higher in T2DM patients than in HCs (t=−3.994, P<0.001). The susceptibility values and cognitive assessment scores showed no obvious association (P>0.05). However, an obvious correlation was observed between the changes in the susceptibility values in the putamen and the thalamus/dentate nucleus (r=0.404, P<0.001; r=0.423, P<0.001). Conclusion. T2DM patients showed increased susceptibility values in the putamen and had declines in executive functions, but the linear association between them was not statistically significant. Changes in susceptibility values in the putamen indicated increased iron deposition and might be used as a quantitative imaging marker of central nervous system injury in T2DM patients. QSM might be able to help probe micro neuronal damage in gray matter and provide information on diabetic encephalopathy.

Increased Brain Iron Detection by Voxel-Based Quantitative Susceptibility Mapping in Type 2 Diabetes Mellitus Patients With an Executive Function Decline

“…In our previous study, the differences of the QSM data between T2DM patients and HCs were investigated by ROI-based comparisons using the independent sample t -test analysis. Although we found that the brain iron deposits in patients with T2DM had an increasing trend than in healthy elderly individuals in all selected iron-rich gray matter nuclei, after multiple comparison correction, only the susceptibility values of putamen had significant difference ( Li et al, 2020 ).…”

Analysis of deep grey nuclei susceptibility in early childhood: a quantitative susceptibility mapping and R2* study at 3 Tesla

“…Iron is a crucial trace element for the development and homeostasis of multiple organs including the central nervous system. Pathological iron deposition in the brain, particularly in deep grey matter structures, has been described in neuroinflammatory [ 1 , 2 ] and neurodegenerative [ 3 , 4 ] as well as metabolic diseases [ 5 ]. In addition, physiological iron deposition is related to normal aging [ 6 ].…”

Basal Ganglia Iron Content Increases with Glioma Severity Using Quantitative Susceptibility Mapping: A Potential Biomarker of Tumor Severity

“…This hypothesis is supported by another recent study in which QSM was used to measure brain iron deposition in patients with type II diabetes mellitus. While decreases in susceptibility were noted for the deep gray matter nuclei of patients compared to healthy controls, the change was only significant for the putamen [ 47 ]. While an exact mechanism for this difference is not known, it was concluded that iron levels in the putamen best reflected iron overload injury to the central nervous system.…”