Characterizing TDP-43 involvement in vascular dementia.

INTRODUCTION

Vascular dementia (VaD) is a major therapeutic challenge. Tar DNA-binding protein 43 (TDP-43), known for its role in neurodegeneration, may contribute to VaD pathogenesis under chronic cerebral hypoperfusion (CCH). This study investigates TDP-43 dysregulation in VaD.

METHODS

TDP-43 and phosphorylated TDP-43 (pTDP-43) expression and localization were assessed in a VaD animal model, neuronal cells exposed to oxygen-glucose deprivation (OGD), and post mortem human brain tissues.

RESULTS

Bilateral Common Carotid Artery Stenosis (BCAS)-induced CCH led to increased pTDP-43 and aberrant redistribution of both TDP-43 and pTDP-43. In vitro OGD triggered similar mislocalization. Post mortem VaD brains showed no TDP-43 abnormalities, while Alzheimer's and mixed dementia cases exhibited marked pathology.

DISCUSSION: TDP-43 dysregulation appears early in VaD under hypoperfusive stress, distinguishing it from other dementia subtypes. These findings indicate that TDP‑43 may warrant further investigation as a potential early molecular feature of VaD.

HIGHLIGHTS: Tar DNA-binding protein 43 (TDP-43) is dysregulated early in vascular dementia models. Hypoperfusion triggers TDP-43 mislocalization and phosphorylation. TDP-43 pathology is absent in late-stage human vascular dementia. TDP-43 is a transient, novel target for vascular cognitive impairment.