Pathophysiology of Neurodegeneration in Late-life Depression (AV45+THK)

In the present project, the investigators will recruit 40 patients with lifetime major depressive disorder, and 20 non-depressed cognitively normal comparison subjects. Alzheimer's disease pathology (A) was determined by measuring Aβ deposition by F-18 AV-45 PET.

In the present project, the investigators will recruit 40 patients with lifetime major depressive disorder, and 20 non-depressed cognitively normal comparison subjects. All subjects will further undergo F-18-THK-5351 image study to detect underlying tau pathology. By doing this, the investigators will elucidate the neurodegenerative pathophysiology behind the link between depressive disorder and the subsequent development of dementia.