Impaired response of cerebral oxygen metabolism to visual stimulation in Huntington’s disease

Author:

Klinkmueller Peter123,Kronenbuerger Martin456,Miao Xinyuan23,Bang Jee45,Ultz Kia E4,Paez Adrian23,Zhang Xiaoyu23,Duan Wenzhen57,Margolis Russell L58,Zijl Peter CM van23,Ross Christopher A578,Hua Jun23

Affiliation:

1. Department of Electrical and Computer Engineering, Johns Hopkins University, Baltimore, MD, USA

2. F.M. Kirby Research Center for Functional Brain Imaging, Kennedy Krieger Institute, Baltimore, MD, USA

3. Neurosection, Division of MRI Research, Department of Radiology, Johns Hopkins University School of Medicine, Baltimore, MD, USA

4. Division of Movement Disorders, Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA

5. Division of Neurobiology, Department of Psychiatry, Johns Hopkins University School of Medicine, Baltimore, MD, USA

6. Department of Neurology, University of Greifswald, Greifswald, Germany

7. Departments of Neuroscience and Pharmacology, Johns Hopkins University School of Medicine, Baltimore, MD, USA

8. Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA

Abstract

Huntington’s disease (HD) is a neurodegenerative disease caused by a CAG triplet repeat expansion in the Huntingtin gene. Metabolic and microvascular abnormalities in the brain may contribute to early physiological changes that subserve the functional impairments in HD. This study is intended to investigate potential abnormality in dynamic changes in cerebral blood volume (CBV) and cerebral blood flow (CBF), and cerebral metabolic rate of oxygen (CMRO2) in the brain in response to functional stimulation in premanifest and early manifest HD patients. A recently developed 3-D-TRiple-acquisition-after-Inversion-Preparation magnetic resonance imaging (MRI) approach was used to measure dynamic responses in CBV, CBF, and CMRO2 during visual stimulation in one single MRI scan. Experiments were conducted in 23 HD patients and 16 healthy controls. Decreased occipital cortex CMRO2 responses were observed in premanifest and early manifest HD patients compared to controls ( P < 0.001), correlating with the CAG-Age Product scores in these patients ( R2 = 0.4, P = 0.001). The results suggest the potential value of this reduced CMRO2 response during visual stimulation as a biomarker for HD and may illuminate the role of metabolic alterations in the pathophysiology of HD.

Publisher

SAGE Publications

Subject

Cardiology and Cardiovascular Medicine,Neurology (clinical),Neurology

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