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  1. Article ; Online: Neuronal vesicular trafficking and release in age-related cognitive impairment.

    Deák, Ferenc

    The journals of gerontology. Series A, Biological sciences and medical sciences

    2014  Volume 69, Issue 11, Page(s) 1325–1330

    Abstract: Aging is a common major risk factor for many neurological disorders resulting in cognitive impairment and neurodegeneration including Parkinson's and Alzheimer's diseases. Novel results from the fields of molecular neuroscience and aging research provide ...

    Abstract Aging is a common major risk factor for many neurological disorders resulting in cognitive impairment and neurodegeneration including Parkinson's and Alzheimer's diseases. Novel results from the fields of molecular neuroscience and aging research provide evidence for a link between decline of various cognitive, executive functions and changes in neuronal mechanisms of intracellular trafficking and regulated vesicle release processes in the aging nervous system. In this Perspective, we review these recent findings and formulate a hypothesis on how cargo delivery to the synapses and the release of neurotrophic factors may be involved in maintaining learning and memory capabilities during healthy aging and present examples on how defects of those disrupt normal cognition. We provide an overview of emerging new concepts and approaches that will significantly advance our understanding of the aging brain and pathophysiology of dementia. This knowledge will be instrumental in defining drug targets and designing novel therapeutic strategies.
    MeSH term(s) Actin Cytoskeleton/physiology ; Aging/physiology ; Aging/psychology ; Animals ; Brain/physiopathology ; CA1 Region, Hippocampal/physiopathology ; Cognition Disorders/physiopathology ; Humans ; Models, Neurological ; Molecular Motor Proteins/physiology ; Nerve Degeneration/physiopathology ; Nerve Growth Factors/physiology ; Neuronal Plasticity/physiology ; Neurons/physiology ; Receptors, AMPA/physiology ; Synaptic Transmission/physiology ; Synaptic Vesicles/physiology ; tau Proteins/physiology
    Chemical Substances Molecular Motor Proteins ; Nerve Growth Factors ; Receptors, AMPA ; tau Proteins
    Language English
    Publishing date 2014-11
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 1223643-3
    ISSN 1758-535X ; 1079-5006
    ISSN (online) 1758-535X
    ISSN 1079-5006
    DOI 10.1093/gerona/glu061
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Evaluation of Waldmann-type and Frenkel-type foot and mouth disease in pigs.

    Solyom, F / Szent-Ivanyi, M / Deak, F

    Revue scientifique et technique (International Office of Epizootics)

    2017  Volume 3, Issue 2, Page(s) 351–367

    Language English
    Publishing date 2017-12-13
    Publishing country France
    Document type Journal Article
    ZDB-ID 792125-1
    ISSN 1608-0637 ; 0253-1933
    ISSN (online) 1608-0637
    ISSN 0253-1933
    DOI 10.20506/rst.3.2.161
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Alterations in Alzheimer's disease microglia transcriptome might be involved in bone pathophysiology.

    Gharpure, Mohini / Vyavahare, Sagar / Ahluwalia, Pankaj / Gupta, Sonu Kumar / Lee, Tae Jin / Lohakare, Jayant / Kolhe, Ravindra / Lei, Yun / Deak, Ferenc / Lu, Xin-Yun / Isales, Carlos M / Fulzele, Sadanand

    Neurobiology of disease

    2024  Volume 191, Page(s) 106404

    Abstract: Aging is a major risk factor for multiple chronic disorders in the elderly population, including Alzheimer's disease (AD) and Osteoporosis. AD is a progressive neurodegenerative disease characterized by memory loss. In addition to dementia, several ... ...

    Abstract Aging is a major risk factor for multiple chronic disorders in the elderly population, including Alzheimer's disease (AD) and Osteoporosis. AD is a progressive neurodegenerative disease characterized by memory loss. In addition to dementia, several studies have shown that AD patients experience an increased rate of musculoskeletal co-morbidities, such as osteoporosis. Since tissue-specific macrophages contribute to both diseases, this study analyzed the microglia transcriptome of AD mice to determine a common gene signature involved in osteoclast biology. After comparing differentially regulated genes from GEO data sets (GSE93824 and GSE212277), there were 35 common upregulated genes and 89 common downregulated genes. Of these common genes, seven genes are known to play an important role in bone homeostasis. CSF1, SPP1, FAM20C, and Cst7 were upregulated and are associated with osteoclastogenesis and inflammation. Among the downregulated genes, LILRA6, MMP9, and COL18A1 are involved in bone formation and osteoclast regulation. We further validated some of these genes (CSF1, Cst7, and SPP1) in the cortex and the bone of AD mice models. The dysregulation of these microglial genes in AD might provide insights into the co-occurrence of AD and osteoporosis and offer potential therapeutic targets to combat disease progression.
    MeSH term(s) Aged ; Humans ; Mice ; Animals ; Alzheimer Disease/genetics ; Transcriptome ; Microglia ; Neurodegenerative Diseases ; Osteoporosis/genetics ; Calcium-Binding Proteins/genetics ; Extracellular Matrix Proteins
    Chemical Substances FAM20C protein, mouse ; Calcium-Binding Proteins ; Extracellular Matrix Proteins
    Language English
    Publishing date 2024-01-04
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1211786-9
    ISSN 1095-953X ; 0969-9961
    ISSN (online) 1095-953X
    ISSN 0969-9961
    DOI 10.1016/j.nbd.2024.106404
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Age-Related Cognitive Impairment: Role of Reduced Synaptobrevin-2 Levels in Deficits of Memory and Synaptic Plasticity.

    Orock, Albert / Logan, Sreemathi / Deak, Ferenc

    The journals of gerontology. Series A, Biological sciences and medical sciences

    2019  Volume 75, Issue 9, Page(s) 1624–1632

    Abstract: Cognitive impairment in the aging population is quickly becoming a health care priority, for which currently no disease-modifying treatment is available. Multiple domains of cognition decline with age even in the absence of neurodegenerative diseases. ... ...

    Abstract Cognitive impairment in the aging population is quickly becoming a health care priority, for which currently no disease-modifying treatment is available. Multiple domains of cognition decline with age even in the absence of neurodegenerative diseases. The cellular and molecular changes leading to cognitive decline with age remain elusive. Synaptobrevin-2 (Syb2), the major vesicular SNAP receptor protein, highly expressed in the cerebral cortex and hippocampus, is essential for synaptic transmission. We have analyzed Syb2 protein levels in mice and found a decrease with age. To investigate the functional consequences of lower Syb2 expression, we have used adult Syb2 heterozygous mice (Syb2+/-) with reduced Syb2 levels. This allowed us to mimic the age-related decrease of Syb2 in the brain in order to selectively test its effects on learning and memory. Our results show that Syb2+/- animals have impaired learning and memory skills and they perform worse with age in the radial arm water maze assay. Syb2+/- hippocampal neurons have reduced synaptic plasticity with reduced release probability and impaired long-term potentiation in the CA1 region. Syb2+/- neurons also have lower vesicular release rates when compared to WT controls. These results indicate that reduced Syb2 expression with age is sufficient to cause cognitive impairment.
    MeSH term(s) Animals ; Blotting, Western ; Brain/metabolism ; Brain/physiopathology ; Cognitive Aging/physiology ; Heterozygote ; Hippocampus/metabolism ; Hippocampus/physiopathology ; Maze Learning ; Memory Disorders/blood ; Memory Disorders/physiopathology ; Mice ; Mice, Knockout ; Neuronal Plasticity/physiology ; Vesicle-Associated Membrane Protein 2/analysis ; Vesicle-Associated Membrane Protein 2/metabolism
    Chemical Substances Vesicle-Associated Membrane Protein 2 ; vesicle-associated membrane protein 2, mouse
    Language English
    Publishing date 2019-01-09
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 1223643-3
    ISSN 1758-535X ; 1079-5006
    ISSN (online) 1758-535X
    ISSN 1079-5006
    DOI 10.1093/gerona/glz013
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Novel Cellular Functions of Very Long Chain-Fatty Acids: Insight From ELOVL4 Mutations.

    Deák, Ferenc / Anderson, Robert E / Fessler, Jennifer L / Sherry, David M

    Frontiers in cellular neuroscience

    2019  Volume 13, Page(s) 428

    Abstract: Elongation of Very Long chain fatty acids-4 (ELOVL4) protein is a member of the ELOVL family of fatty acid elongases that is collectively responsible for catalyzing formation of long chain fatty acids. ELOVL4 is the only family member that catalyzes ... ...

    Abstract Elongation of Very Long chain fatty acids-4 (ELOVL4) protein is a member of the ELOVL family of fatty acid elongases that is collectively responsible for catalyzing formation of long chain fatty acids. ELOVL4 is the only family member that catalyzes production of Very Long Chain Saturated Fatty Acids (VLC-SFA) and Very Long Chain Polyunsaturated Fatty Acids (VLC-PUFA) with chain lengths ≥28 carbons. ELOVL4 and its VLC-SFA and VLC-PUFA products are emerging as important regulators of synaptic signaling and neuronal survival in the central nervous system (CNS). Distinct sets of mutations in
    Language English
    Publishing date 2019-09-20
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2452963-1
    ISSN 1662-5102
    ISSN 1662-5102
    DOI 10.3389/fncel.2019.00428
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  6. Article ; Online: Munc18-1 haploinsufficiency impairs learning and memory by reduced synaptic vesicular release in a model of Ohtahara syndrome.

    Orock, Albert / Logan, Sreemathi / Deak, Ferenc

    Molecular and cellular neurosciences

    2017  Volume 88, Page(s) 33–42

    Abstract: Ohtahara syndrome, also known as type 4 of Early Infantile Epileptic Encephalopathy with suppression bursts (EIEE-4) is currently an untreatable disorder that presents with seizures and impaired cognition. EIEE-4 patients have mutations most frequently ... ...

    Abstract Ohtahara syndrome, also known as type 4 of Early Infantile Epileptic Encephalopathy with suppression bursts (EIEE-4) is currently an untreatable disorder that presents with seizures and impaired cognition. EIEE-4 patients have mutations most frequently in the STXBP1 gene encoding a Sec protein, munc18-1. The exact molecular mechanism of how these munc18-1 mutations cause impaired cognition, remains elusive. The leading haploinsufficiency hypothesis posits that mutations in munc18-1 render the protein unstable leading to its degradation. Expression driven by the healthy allele is not sufficient to maintain the physiological function resulting in haploinsufficiency. The aim of this study has been to understand how munc18-1 haploinsufficiency causes cognitive impairment seen in EIEE-4. Here we present results from behavioral to cellular effects from a mouse model of munc18-1 haploinsufficiency. Munc18-1 heterozygous knock-out mice showed impaired spatial learning and memory in behavior tests as well as reduced synaptic plasticity in hippocampal CA1 long-term potentiation. Cultured munc18-1 heterozygous hippocampal neurons had significantly slower rate of synaptic vesicle release and decreased readily releasable vesicle pool compared to wild-type control neurons in fluorescent FM dye assays. These results demonstrate that reduced munc18-1 levels are sufficient to impair learning and memory by reducing neurotransmitter release. Therefore, our study implicates munc18-1 haploinsufficiency as a primary cause of cognitive impairment seen in EIEE-4 patients.
    MeSH term(s) Animals ; Brain/physiopathology ; Haploinsufficiency/genetics ; Heterozygote ; Learning/physiology ; Memory/physiology ; Mice, Knockout ; Munc18 Proteins/genetics ; Mutation/genetics ; Neurons/metabolism ; Spasms, Infantile/genetics ; Synaptic Transmission/genetics ; Synaptic Vesicles/metabolism
    Chemical Substances Munc18 Proteins ; Stxbp1 protein, mouse
    Language English
    Publishing date 2017-12-05
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 1046640-x
    ISSN 1095-9327 ; 1044-7431
    ISSN (online) 1095-9327
    ISSN 1044-7431
    DOI 10.1016/j.mcn.2017.12.002
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: CRISPR-Cas9 Long-Read Sequencing for Mapping Transgenes in the Mouse Genome.

    Bryant, W Bart / Yang, Allison / Griffin, Susan H / Zhang, Wei / Rafiq, Ashiq M / Han, Weiping / Deak, Ferenc / Mills, Mary Katherine / Long, Xiaochun / Miano, Joseph M

    The CRISPR journal

    2023  Volume 6, Issue 2, Page(s) 163–175

    Abstract: Microinjected transgenes, both large and small, are known to insert randomly into the mouse genome. Traditional methods of mapping a transgene are challenging, thus complicating breeding strategies and accurate interpretation of phenotypes, particularly ... ...

    Abstract Microinjected transgenes, both large and small, are known to insert randomly into the mouse genome. Traditional methods of mapping a transgene are challenging, thus complicating breeding strategies and accurate interpretation of phenotypes, particularly when a transgene disrupts critical coding or noncoding sequences. As the vast majority of transgenic mouse lines remain unmapped, we developed CRISPR-Cas9 Long-Read Sequencing (CRISPR-LRS) to ascertain transgene integration loci. This novel approach mapped a wide size range of transgenes and uncovered more complex transgene-induced host genome re-arrangements than previously appreciated. CRISPR-LRS offers a facile, informative approach to establish robust breeding practices and will enable researchers to study a gene without confounding genetic issues. Finally, CRISPR-LRS will find utility in rapidly and accurately interrogating gene/genome editing fidelity in experimental and clinical settings.
    MeSH term(s) Animals ; Mice ; Gene Editing ; CRISPR-Cas Systems/genetics ; Transgenes ; Genome/genetics ; Mice, Transgenic
    Language English
    Publishing date 2023-04-18
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 3017891-5
    ISSN 2573-1602 ; 2573-1599
    ISSN (online) 2573-1602
    ISSN 2573-1599
    DOI 10.1089/crispr.2022.0099
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  8. Article ; Online: Aging, synaptic dysfunction, and insulin-like growth factor (IGF)-1.

    Deak, Ferenc / Sonntag, William E

    The journals of gerontology. Series A, Biological sciences and medical sciences

    2012  Volume 67, Issue 6, Page(s) 611–625

    Abstract: Insulin-like growth factor (IGF)-1 is an important neurotrophic hormone. Deficiency of this hormone has been reported to influence the genesis of cognitive impairment and dementia in the elderly patients. Nevertheless, there are studies indicating that ... ...

    Abstract Insulin-like growth factor (IGF)-1 is an important neurotrophic hormone. Deficiency of this hormone has been reported to influence the genesis of cognitive impairment and dementia in the elderly patients. Nevertheless, there are studies indicating that cognitive function can be maintained into old age even in the absence of circulating IGF-1 and studies that link IGF-1 to an acceleration of neurological diseases. Although IGF-1 has a complex role in brain function, synaptic effects appear to be central to the IGF-1-induced improvement in learning and memory. In this review, synaptic mechanisms of learning and memory and the effects of IGF-1 on synaptic communication are discussed. The emerging data indicate that synaptic function decreases with age and that IGF-1 contributes to information processing in the brain. Further studies that detail the specific actions of this important neurotrophic hormone will likely lead to therapies that result in improved cognitive function for the elderly patients.
    MeSH term(s) Aging/metabolism ; Aging/physiology ; Animals ; Cognition Disorders/metabolism ; Cognition Disorders/physiopathology ; Female ; Humans ; Insulin-Like Growth Factor I/metabolism ; Learning/physiology ; Long-Term Potentiation/physiology ; Male ; Mice ; Rats ; Synapses/metabolism ; Synapses/physiology
    Chemical Substances Insulin-Like Growth Factor I (67763-96-6)
    Language English
    Publishing date 2012-04-12
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 1223643-3
    ISSN 1758-535X ; 1079-5006
    ISSN (online) 1758-535X
    ISSN 1079-5006
    DOI 10.1093/gerona/gls118
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Matrilin-2, an extracellular adaptor protein, is needed for the regeneration of muscle, nerve and other tissues.

    Korpos, Éva / Deák, Ferenc / Kiss, Ibolya

    Neural regeneration research

    2015  Volume 10, Issue 6, Page(s) 866–869

    Abstract: The extracellular matrix (ECM) performs essential functions in the differentiation, maintenance and remodeling of tissues during development and regeneration, and it undergoes dynamic changes during remodeling concomitant to alterations in the cell-ECM ... ...

    Abstract The extracellular matrix (ECM) performs essential functions in the differentiation, maintenance and remodeling of tissues during development and regeneration, and it undergoes dynamic changes during remodeling concomitant to alterations in the cell-ECM interactions. Here we discuss recent data addressing the critical role of the widely expressed ECM protein, matrilin-2 (Matn2) in the timely onset of differentiation and regeneration processes in myogenic, neural and other tissues and in tumorigenesis. As a multiadhesion adaptor protein, it interacts with other ECM proteins and integrins. Matn2 promotes neurite outgrowth, Schwann cell migration, neuromuscular junction formation, skeletal muscle and liver regeneration and skin wound healing. Matn2 deposition by myoblasts is crucial for the timely induction of the global switch toward terminal myogenic differentiation during muscle regeneration by affecting transforming growth factor beta/bone morphogenetic protein 7/Smad and other signal transduction pathways. Depending on the type of tissue and the pathomechanism, Matn2 can also promote or suppress tumor growth.
    Language English
    Publishing date 2015-06-25
    Publishing country India
    Document type Journal Article
    ZDB-ID 2388460-5
    ISSN 1876-7958 ; 1673-5374
    ISSN (online) 1876-7958
    ISSN 1673-5374
    DOI 10.4103/1673-5374.158332
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  10. Article ; Online: W246G Mutant ELOVL4 Impairs Synaptic Plasticity in Parallel and Climbing Fibers and Causes Motor Defects in a Rat Model of SCA34.

    Nagaraja, Raghavendra Y / Sherry, David M / Fessler, Jennifer L / Stiles, Megan A / Li, Feng / Multani, Karanpreet / Orock, Albert / Ahmad, Mohiuddin / Brush, Richard S / Anderson, Robert E / Agbaga, Martin-Paul / Deák, Ferenc

    Molecular neurobiology

    2021  Volume 58, Issue 10, Page(s) 4921–4943

    Abstract: Spinocerebellar ataxia (SCA) is a neurodegenerative disorder characterized by ataxia and cerebellar atrophy. A number of different mutations gives rise to different types of SCA with characteristic ages of onset, symptomatology, and rates of progression. ...

    Abstract Spinocerebellar ataxia (SCA) is a neurodegenerative disorder characterized by ataxia and cerebellar atrophy. A number of different mutations gives rise to different types of SCA with characteristic ages of onset, symptomatology, and rates of progression. SCA type 34 (SCA34) is caused by mutations in ELOVL4 (ELOngation of Very Long-chain fatty acids 4), a fatty acid elongase essential for biosynthesis of Very Long Chain Saturated and Polyunsaturated Fatty Acids (VLC-SFA and VLC-PUFA, resp., ≥28 carbons), which have important functions in the brain, skin, retina, Meibomian glands, testes, and sperm. We generated a rat model of SCA34 by knock-in of the SCA34-causing 736T>G (p.W246G) ELOVL4 mutation. Rats carrying the mutation developed impaired motor deficits by 2 months of age. To understand the mechanism of these motor deficits, we performed electrophysiological studies using cerebellar slices from rats homozygous for W246G mutant ELOVL4 and found marked reduction of long-term potentiation at parallel fiber synapses and long-term depression at climbing fiber synapses onto Purkinje cells. Neuroanatomical analysis of the cerebellum showed normal cytoarchitectural organization with no evidence of degeneration out to 6 months of age. These results point to ELOVL4 as essential for motor function and cerebellar synaptic plasticity. The results further suggest that ataxia in SCA34 patients may arise from a primary impairment of synaptic plasticity and cerebellar network desynchronization before onset of neurodegeneration and progression of the disease at a later age.
    MeSH term(s) Animals ; Cerebellum/pathology ; Eye Proteins/genetics ; Female ; Male ; Membrane Proteins/genetics ; Motor Disorders/genetics ; Motor Disorders/pathology ; Mutation/genetics ; Nerve Fibers, Myelinated/pathology ; Neuronal Plasticity/physiology ; Organ Culture Techniques ; Rats ; Rats, Long-Evans ; Rats, Transgenic ; Spinocerebellar Ataxias/genetics ; Spinocerebellar Ataxias/pathology
    Chemical Substances Elovl4 protein, mouse ; Eye Proteins ; Membrane Proteins
    Language English
    Publishing date 2021-07-05
    Publishing country United States
    Document type Journal Article
    ZDB-ID 645020-9
    ISSN 1559-1182 ; 0893-7648
    ISSN (online) 1559-1182
    ISSN 0893-7648
    DOI 10.1007/s12035-021-02439-1
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