Are Structural Changes Induced by Lithium in the HIV Brain Accompanied by Changes in Functional Connectivity? 2015

Madalina E Tivarus, and Britta Pester, and Christoph Schmidt, and Thomas Lehmann, and Tong Zhu, and Jianhui Zhong, and Lutz Leistritz, and Giovanni Schifitto
Department of Imaging Sciences, University of Rochester Medical Center, Rochester, New York, United States of America.

Lithium therapy has been shown to affect imaging measures of brain function and microstructure in human immunodeficiency virus (HIV)-infected subjects with cognitive impairment. The aim of this proof-of-concept study was to explore whether changes in brain microstructure also entail changes in functional connectivity. Functional MRI data of seven cognitively impaired HIV infected individuals enrolled in an open-label lithium study were included in the connectivity analysis. Seven regions of interest (ROI) were defined based on previously observed lithium induced microstructural changes measured by Diffusion Tensor Imaging. Generalized partial directed coherence (gPDC), based on time-variant multivariate autoregressive models, was used to quantify the degree of connectivity between the selected ROIs. Statistical analyses using a linear mixed model showed significant differences in the average node strength between pre and post lithium therapy conditions. Specifically, we found that lithium treatment in this population induced changes suggestive of increased strength in functional connectivity. Therefore, by exploiting the information about the strength of functional interactions provided by gPDC we can quantify the connectivity changes observed in relation to a given intervention. Furthermore, in conditions where the intervention is associated with clinical changes, we suggest that this methodology could enable an interpretation of such changes in the context of disease or treatment induced modulations in functional networks.

UI MeSH Term Description Entries
D008279 Magnetic Resonance Imaging Non-invasive method of demonstrating internal anatomy based on the principle that atomic nuclei in a strong magnetic field absorb pulses of radiofrequency energy and emit them as radiowaves which can be reconstructed into computerized images. The concept includes proton spin tomographic techniques. Chemical Shift Imaging,MR Tomography,MRI Scans,MRI, Functional,Magnetic Resonance Image,Magnetic Resonance Imaging, Functional,Magnetization Transfer Contrast Imaging,NMR Imaging,NMR Tomography,Tomography, NMR,Tomography, Proton Spin,fMRI,Functional Magnetic Resonance Imaging,Imaging, Chemical Shift,Proton Spin Tomography,Spin Echo Imaging,Steady-State Free Precession MRI,Tomography, MR,Zeugmatography,Chemical Shift Imagings,Echo Imaging, Spin,Echo Imagings, Spin,Functional MRI,Functional MRIs,Image, Magnetic Resonance,Imaging, Magnetic Resonance,Imaging, NMR,Imaging, Spin Echo,Imagings, Chemical Shift,Imagings, Spin Echo,MRI Scan,MRIs, Functional,Magnetic Resonance Images,Resonance Image, Magnetic,Scan, MRI,Scans, MRI,Shift Imaging, Chemical,Shift Imagings, Chemical,Spin Echo Imagings,Steady State Free Precession MRI
D008570 Memory, Short-Term Remembrance of information for a few seconds to hours. Immediate Recall,Memory, Immediate,Working Memory,Memory, Shortterm,Immediate Memories,Immediate Memory,Immediate Recalls,Memories, Immediate,Memories, Short-Term,Memories, Shortterm,Memory, Short Term,Recall, Immediate,Recalls, Immediate,Short-Term Memories,Short-Term Memory,Shortterm Memories,Shortterm Memory,Working Memories
D008959 Models, Neurological Theoretical representations that simulate the behavior or activity of the neurological system, processes or phenomena; includes the use of mathematical equations, computers, and other electronic equipment. Neurologic Models,Model, Neurological,Neurologic Model,Neurological Model,Neurological Models,Model, Neurologic,Models, Neurologic
D001921 Brain The part of CENTRAL NERVOUS SYSTEM that is contained within the skull (CRANIUM). Arising from the NEURAL TUBE, the embryonic brain is comprised of three major parts including PROSENCEPHALON (the forebrain); MESENCEPHALON (the midbrain); and RHOMBENCEPHALON (the hindbrain). The developed brain consists of CEREBRUM; CEREBELLUM; and other structures in the BRAIN STEM. Encephalon
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D015526 AIDS Dementia Complex A neurologic condition associated with the ACQUIRED IMMUNODEFICIENCY SYNDROME and characterized by impaired concentration and memory, slowness of hand movements, ATAXIA, incontinence, apathy, and gait difficulties associated with HIV-1 viral infection of the central nervous system. Pathologic examination of the brain reveals white matter rarefaction, perivascular infiltrates of lymphocytes, foamy macrophages, and multinucleated giant cells. (From Adams et al., Principles of Neurology, 6th ed, pp760-1; N Engl J Med, 1995 Apr 6;332(14):934-40) AIDS Encephalopathy,Dementia Complex, AIDS-Related,HIV Dementia,HIV Encephalopathy,HIV-1-Associated Cognitive Motor Complex,HIV-Associated Cognitive Motor Complex,AIDS-Related Dementia Complex,Acquired-Immune Deficiency Syndrome Dementia Complex,Dementia Complex, Acquired Immune Deficiency Syndrome,Encephalopathy, AIDS,Encephalopathy, HIV,HIV-1 Cognitive and Motor Complex,AIDS Encephalopathies,AIDS Related Dementia Complex,Complex, AIDS Dementia,Complex, AIDS-Related Dementia,Dementia Complex, AIDS,Dementia Complex, AIDS Related,Dementia, HIV,Dementias, HIV,Encephalopathies, AIDS,Encephalopathies, HIV,HIV 1 Associated Cognitive Motor Complex,HIV 1 Cognitive and Motor Complex,HIV Associated Cognitive Motor Complex,HIV Dementias,HIV Encephalopathies
D016651 Lithium Carbonate A lithium salt, classified as a mood-stabilizing agent. Lithium ion alters the metabolism of BIOGENIC MONOAMINES in the CENTRAL NERVOUS SYSTEM, and affects multiple neurotransmission systems. CP-15,467-61,Dilithium Carbonate,Eskalith,Lithane,Lithium Bicarbonate,Lithobid,Lithonate,Lithotabs,Micalith,NSC-16895,Priadel,Quilinorm-retard,Bicarbonate, Lithium,CP 15,467 61,CP15,46761,Carbonate, Dilithium,Carbonate, Lithium,NSC 16895,NSC16895,Quilinorm retard,Quilinormretard
D056324 Diffusion Tensor Imaging The use of diffusion ANISOTROPY data from diffusion magnetic resonance imaging results to construct images based on the direction of the faster diffusing molecules. Diffusion Tractography,DTI MRI,Diffusion Tensor MRI,Diffusion Tensor Magnetic Resonance Imaging,Diffusion Tensor MRIs,Imaging, Diffusion Tensor,MRI, Diffusion Tensor,Tractography, Diffusion
D018697 Nootropic Agents Drugs used to specifically facilitate learning or memory, particularly to prevent the cognitive deficits associated with dementias. These drugs act by a variety of mechanisms. Anti-Dementia Agent,Antidementia Agent,Cognitive Enhancer,Cognitive Enhancers,Nootropic,Nootropic Agent,Nootropic Drug,Procognitive Agent,Anti-Dementia Agents,Antidementia Agents,Nootropic Drugs,Nootropics,Procognitive Agents,Agent, Anti-Dementia,Agent, Antidementia,Agent, Nootropic,Agent, Procognitive,Agents, Anti-Dementia,Agents, Antidementia,Agents, Nootropic,Agents, Procognitive,Anti Dementia Agent,Anti Dementia Agents,Drug, Nootropic,Drugs, Nootropic,Enhancer, Cognitive,Enhancers, Cognitive
D063132 Connectome A comprehensive map of the physical interconnections of an organism's neural networks. This modular organization of neuronal architecture is believed to underlie disease mechanisms and the biological development of the CENTRAL NERVOUS SYSTEM. Brain Connectomics,Connectome Mapping,Connectomics,Human Connectome,Human Connectome Project,Brain Connectomic,Connectome Mappings,Connectome Project, Human,Connectome Projects, Human,Connectome, Human,Connectomes,Connectomes, Human,Connectomic,Connectomic, Brain,Connectomics, Brain,Human Connectome Projects,Human Connectomes,Mapping, Connectome,Mappings, Connectome

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