George Dai

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We previously reported that coenzyme Q10 (CoQ10) could reduce intracellular deposition in an aged transgenic mouse model. Here, we further tested the effect of CoQ10 on amyloid plaque in an amyloid precursor protein/presenilin 1 transgenic mouse model of Alzheimer's disease (AD). By using immunohistochemistry and magnetic resonance imaging to determine the(More)
Mechanisms that underlie early ischemic damages to the blood-brain-barrier (BBB) are not well understood. This study presents a novel magnetic resonance imaging (MRI) technique using a widely available pulse sequence and a long-circulating intravascular contrast agent to quantify water movements across the BBB at early stages of stroke progression. We(More)
Brain responses to external stimuli after permanent and transient ischemic insults have been documented using cerebral blood volume weighted (CBVw) functional magnetic resonance imaging (fMRI) in correlation with tissue damage and neurological recovery. Here, we extend our previous studies of stroke recovery in rat models of focal cerebral ischemia by(More)
Accumulating experimental and clinical data suggest that albumin may be neuroprotective for stroke. Here, we use functional magnetic resonance imaging (fMRI) to evaluate the therapeutic efficacy of albumin and its effects on the recovery of stimuli-induced cerebral hemodynamics. For this purpose, fMRI activity in the ipsilesional somatosensory (SS) cortex(More)
BACKGROUND AND PURPOSE The use of lithium as a neuroprotective agent has been demonstrated using various models in which improvements in infarct size, DNA damage, and neurological function were reported. We further investigated neurohemodynamic aspects of the treatment-associated recovery by assessing the therapeutic efficacy of delayed chronic lithium(More)
The ability to image cardiomyocyte apoptosis in vivo with high-resolution MRI could facilitate the development of novel cardioprotective therapies. The sensitivity of the novel nanoparticle AnxCLIO-Cy5.5 for cardiomyocyte apoptosis was thus compared in vitro to that of annexin V-FITC and showed a high degree of colocalization. MRI was then performed,(More)
The anatomy of the mammalian tongue consists of an intricate array of variably aligned and extensively interwoven muscle fibers. As a result, it is particularly difficult to resolve the relationship between the tongue's microscopic anatomy and tissue-scale mechanical function. In order to address this question, we employed a method, diffusion spectrum(More)
The aim of the study was to compare and analyze different noninvasive indices of cell damage in the isolated pig heart model of regional ischemia. We used (23)Na and (87)Rb MR imaging to evaluate Na(+)/K(+) balance, (31)P MR spectroscopy to measure energetics, and optical spectroscopy to assess oxymyoglobin (MbO(2)). Hearts were subjected to 120-min(More)
K(+) uptake rates were measured in the anterior (An) and posterior (Pos) LV walls of pig hearts before and after regional ischemia and reperfusion using Rb(+) as a K(+) congener and 3D (87)Rb NMR imaging and spectroscopy as detection methods. The hearts were perfused by the Langendorff method with Krebs-Henseleit (KH) buffer and loaded with Rb(+) (4.7 mM,(More)
Vasoreactivity to hypercapnia has been used for assessing cerebrovascular tone and control altered by ischemic stroke. Despite the high prognostic potential, traits of hypercapnia-induced hemodynamic changes have not been fully characterized in relation with baseline vascular states and brain tissue damage. To monitor cerebrovascular responses, T2- and(More)