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  1. Article ; Online: Spinal microglia-neuron interactions in chronic pain.

    Ho, Idy H T / Chan, Matthew T V / Wu, William K K / Liu, Xiaodong

    Journal of leukocyte biology

    2020  Volume 108, Issue 5, Page(s) 1575–1592

    Abstract: Current deficiency in our understanding of acute-to-chronic pain transition remains a hurdle for developing effective treatments against chronic pain. Whereas neurocentric mechanisms alone are insufficient to provide satisfactory explanation for such ... ...

    Abstract Current deficiency in our understanding of acute-to-chronic pain transition remains a hurdle for developing effective treatments against chronic pain. Whereas neurocentric mechanisms alone are insufficient to provide satisfactory explanation for such transition, neuro-immune crosstalk has attracted attention in recent pain research. In contrast to brain microglia, spinal microglia are activated immediately in various pain states. The fast-responsive enrichment and activation of spinal microglia among different pain conditions have highlighted the crucial role of neuroinflammation caused by microglia-neuron crosstalk in pain initiation. Recent studies have revealed spinal microglia-neuron interactions are also involved in chronic pain maintenance, albeit, with different anatomic distribution, cellular and molecular mechanisms, and biologic functions. Delineating the exact temporal discrepancies of spinal microglia distribution and functions along acute-to-chronic pain transition may provide additional mechanistic insights for drug development to prevent deterioration of acute pain into the chronic state. This narrative review summerizes the longitudinal alterations of spinal microglia-neuron interactions in the initiation of pain hypersensitivity, acute-to-chronic pain progression, and chronic pain maintenance, followed by an overview of current clinical translation of preclinical studies on spinal microglia. This review highlights the crucial role of the interaction between spinal microglia and neighboring neurons in the initiation and maintenance of pain hypersensitivity, in relation to the release of cytokines, chemokines, and neuroactive substances, as well as the modulation of synaptic plasticity. Further exploration of the uncharted functions of spinal microglia-neuron crosstalk may lead to the design of novel drugs for preventing acute-to-chronic pain transition.
    MeSH term(s) Animals ; Chronic Pain/immunology ; Chronic Pain/pathology ; Cytokines/immunology ; Humans ; Microglia/immunology ; Microglia/pathology ; Neurons/immunology ; Neurons/pathology ; Signal Transduction/immunology ; Spinal Cord/immunology ; Spinal Cord/pathology
    Chemical Substances Cytokines
    Language English
    Publishing date 2020-06-23
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 605722-6
    ISSN 1938-3673 ; 0741-5400
    ISSN (online) 1938-3673
    ISSN 0741-5400
    DOI 10.1002/JLB.3MR0520-695R
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Genetic Deletion of

    Liu, Yun / Zhu, Zeyao / Ho, Idy H T / Shi, Yujian / Li, Jianzhen / Wang, Xia / Chan, Matthew T V / Cheng, Christopher H K

    Frontiers in genetics

    2020  Volume 11, Page(s) 853

    Abstract: ... MiR- ... ...

    Abstract MiR-430
    Language English
    Publishing date 2020-08-04
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2606823-0
    ISSN 1664-8021
    ISSN 1664-8021
    DOI 10.3389/fgene.2020.00853
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Long non-coding RNAs in the spinal cord injury: Novel spotlight.

    Li, Zheng / Ho, Idy H T / Li, Xingye / Xu, Derong / Wu, William K K / Chan, Matthew T V / Li, Shugang / Liu, Xiaodong

    Journal of cellular and molecular medicine

    2019  Volume 23, Issue 8, Page(s) 4883–4890

    Abstract: Spinal cord injury (SCI) may lead to persistent locomotor dysfunction and somatosensory disorders, which adversely affect the quality of life of patients and cause a significant economic burden to the society. The efficacies of current therapeutic ... ...

    Abstract Spinal cord injury (SCI) may lead to persistent locomotor dysfunction and somatosensory disorders, which adversely affect the quality of life of patients and cause a significant economic burden to the society. The efficacies of current therapeutic interventions are still far from satisfaction as the secondary damages resulting from the complex and progressive molecular alterations after SCI are not properly addressed. Recent studies revealed that long non-coding RNAs (lncRNAs) are abundant in the brain and might play critical roles in several nervous system disorders. At the cellular level, lncRNAs have been shown to regulate the expression of protein-coding RNAs and hence participate in neuronal death, demyelination and glia activation. Notably, SCI is characterized by these biological processes, suggesting that lncRNAs could be novel modulators in the pathogenesis of SCI. This review describes recent progresses in the lncRNA transcriptome analyses and their molecular functions in regulating SCI progression.
    MeSH term(s) Animals ; Apoptosis/genetics ; Gene Expression Profiling ; Humans ; Neuroglia/cytology ; Neuroglia/metabolism ; Neurons/metabolism ; Neurons/pathology ; RNA, Long Noncoding/genetics ; RNA, Long Noncoding/metabolism ; Spinal Cord/metabolism ; Spinal Cord/pathology ; Spinal Cord Injuries/genetics ; Spinal Cord Injuries/metabolism ; Spinal Cord Injuries/pathology ; Transcriptome
    Chemical Substances RNA, Long Noncoding
    Language English
    Publishing date 2019-05-29
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 2074559-X
    ISSN 1582-4934 ; 1582-4934 ; 1582-1838
    ISSN (online) 1582-4934
    ISSN 1582-4934 ; 1582-1838
    DOI 10.1111/jcmm.14422
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Annexin A2 traps mu-opioid receptors in recycling endosomes upon remifentanil-induced internalization.

    Ho, Idy H T / Ng, Lhotse H L / Cheng, Xiaojie / Gin, Tony / Chan, Chee Sam / Sun, Wuping / Xiao, Lizu / Zhang, Lin / Chan, Matthew T V / Wu, William K K / Liu, Xiaodong

    Neurobiology of pain (Cambridge, Mass.)

    2021  Volume 10, Page(s) 100071

    Abstract: ANXA2 is a novel MOR1-interacting protein regulating MOR1 sub-cellular localization.•ANXA2 retains MOR1 in late recycling endosomes after remifentanil exposure. ...

    Abstract •ANXA2 is a novel MOR1-interacting protein regulating MOR1 sub-cellular localization.•ANXA2 retains MOR1 in late recycling endosomes after remifentanil exposure.
    Language English
    Publishing date 2021-08-02
    Publishing country United States
    Document type Journal Article
    ISSN 2452-073X
    ISSN (online) 2452-073X
    DOI 10.1016/j.ynpai.2021.100071
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Emerging roles of long non-coding RNAs in neuropathic pain.

    Li, Zheng / Li, Xingye / Chen, Xin / Li, Shugang / Ho, Idy H T / Liu, Xiaodong / Chan, Matthew T V / Wu, William K K

    Cell proliferation

    2018  Volume 52, Issue 1, Page(s) e12528

    Abstract: Neuropathic pain, a type of chronic and potentially disabling pain resulting from primary injury/dysfunction of the somatosensory nervous system and spinal cord injury, is one of the most intense types of chronic pain, which incurs a significant economic ...

    Abstract Neuropathic pain, a type of chronic and potentially disabling pain resulting from primary injury/dysfunction of the somatosensory nervous system and spinal cord injury, is one of the most intense types of chronic pain, which incurs a significant economic and public health burden. However, our understanding of its cellular and molecular pathogenesis is still far from complete. Long non-coding RNAs (lncRNAs) are important regulators of gene expression and have recently been characterized as key modulators of neuronal functions. Emerging evidence suggested that lncRNAs are deregulated and play pivotal roles in the development of neuropathic pain. This review summarizes the current knowledge about the roles of deregulated lncRNAs (eg, KCNA2-AS, uc.48+, NONRATT021972, MRAK009713, XIST, CCAT1) in the development of neuropathic pain. These studies suggested that specific regulation of lncRNAs or their downstream targets might provide novel therapeutic avenues for this refractory disease.
    MeSH term(s) Animals ; Gene Expression Regulation/genetics ; Humans ; Ion Channels/physiology ; MicroRNAs/genetics ; Neuralgia/genetics ; RNA, Long Noncoding/genetics ; Rats ; Sensory Receptor Cells/pathology ; Spinal Cord Injuries/pathology
    Chemical Substances Ion Channels ; MicroRNAs ; RNA, Long Noncoding
    Language English
    Publishing date 2018-10-25
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 1064202-x
    ISSN 1365-2184 ; 0008-8730 ; 0960-7722
    ISSN (online) 1365-2184
    ISSN 0008-8730 ; 0960-7722
    DOI 10.1111/cpr.12528
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Multi-omic analysis suggests tumor suppressor genes evolved specific promoter features to optimize cancer resistance.

    Huang, Dan / Wang, Xiansong / Liu, Yingzhi / Huang, Ziheng / Hu, Xiaoxu / Hu, Wei / Li, Qing / Chan, Hung / Zou, Yidan / Ho, Idy H T / Wang, Yan / Cheng, Alfred S L / Kang, Wei / To, Ka F / Wang, Maggie H T / Wong, Sunny H / Yu, Jun / Gin, Tony / Zhang, Qingpeng /
    Li, Zheng / Shen, Jianxiong / Zhang, Lin / Chan, Matthew T V / Liu, Xiaodong / Wu, William K K

    Briefings in bioinformatics

    2021  Volume 22, Issue 5

    Abstract: Tumor suppressor genes (TSGs) exhibit distinct evolutionary features. We speculated that TSG promoters could have evolved specific features that facilitate their tumor-suppressing functions. We found that the promoter CpG dinucleotide frequencies of TSGs ...

    Abstract Tumor suppressor genes (TSGs) exhibit distinct evolutionary features. We speculated that TSG promoters could have evolved specific features that facilitate their tumor-suppressing functions. We found that the promoter CpG dinucleotide frequencies of TSGs are significantly higher than that of non-cancer genes across vertebrate genomes, and positively correlated with gene expression across tissue types. The promoter CpG dinucleotide frequencies of all genes gradually increase with gene age, for which young TSGs have been subject to a stronger evolutionary pressure. Transcription-related features, namely chromatin accessibility, methylation and ZNF263-, SP1-, E2F4- and SP2-binding elements, are associated with gene expression. Moreover, higher promoter CpG dinucleotide frequencies and chromatin accessibility are positively associated with the ability of TSGs to resist downregulation during tumorigenesis. These results were successfully validated with independent datasets. In conclusion, TSGs evolved specific promoter features that optimized cancer resistance through achieving high expression in normal tissues and resistance to downregulation during tumorigenesis.
    MeSH term(s) Antineoplastic Agents/therapeutic use ; Carcinogenesis/genetics ; Carcinogenesis/metabolism ; Carcinogenesis/pathology ; Cell Line, Tumor ; Chromatin/metabolism ; Chromatin/ultrastructure ; Computational Biology/methods ; CpG Islands ; DNA Methylation ; Datasets as Topic ; Drug Resistance, Neoplasm/genetics ; Evolution, Molecular ; Gene Expression Regulation, Neoplastic ; Gene Ontology ; Genes, Tumor Suppressor ; Humans ; Molecular Sequence Annotation ; Neoplasms/drug therapy ; Neoplasms/genetics ; Neoplasms/metabolism ; Neoplasms/pathology ; Promoter Regions, Genetic ; Protein Interaction Domains and Motifs ; Transcription, Genetic
    Chemical Substances Antineoplastic Agents ; Chromatin
    Language English
    Publishing date 2021-03-29
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2068142-2
    ISSN 1477-4054 ; 1467-5463
    ISSN (online) 1477-4054
    ISSN 1467-5463
    DOI 10.1093/bib/bbab040
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: A Novel Peptide Interfering with proBDNF-Sortilin Interaction Alleviates Chronic Inflammatory Pain.

    Ho, Idy H T / Liu, Xiaodong / Zou, Yidan / Liu, Taian / Hu, Wei / Chan, Hung / Tian, Yuanyuan / Zhang, Yuchen / Li, Qing / Kou, Shanglong / Chan, Chee Sam / Gin, Tony / Cheng, Christopher H K / Wong, Sunny H / Yu, Jun / Zhang, Lin / Wu, William K K / Chan, Matthew T V

    Theranostics

    2019  Volume 9, Issue 6, Page(s) 1651–1665

    Abstract: Rationale: ...

    Abstract Rationale:
    MeSH term(s) Adaptor Proteins, Vesicular Transport/antagonists & inhibitors ; Analgesics/administration & dosage ; Analgesics/pharmacology ; Animals ; Brain-Derived Neurotrophic Factor/antagonists & inhibitors ; Chronic Pain/drug therapy ; Disease Models, Animal ; Ganglia, Spinal/drug effects ; Gene Knockdown Techniques ; Inflammation/complications ; Peptides/administration & dosage ; Peptides/pharmacology ; Rats ; Treatment Outcome
    Chemical Substances Adaptor Proteins, Vesicular Transport ; Analgesics ; Bdnf protein, rat ; Brain-Derived Neurotrophic Factor ; Peptides ; sortilin (Z020Y8WIJ4)
    Language English
    Publishing date 2019-02-28
    Publishing country Australia
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2592097-2
    ISSN 1838-7640 ; 1838-7640
    ISSN (online) 1838-7640
    ISSN 1838-7640
    DOI 10.7150/thno.29703
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: The phytochemical polydatin ameliorates non-alcoholic steatohepatitis by restoring lysosomal function and autophagic flux.

    Chen, Xiaoting / Chan, Hung / Zhang, Lin / Liu, Xiaodong / Ho, Idy H T / Zhang, Xiang / Ho, Jeffery / Hu, Wei / Tian, Yuanyuan / Kou, Shanglong / Chan, Chee Sam / Yu, Jun / Wong, Sunny H / Gin, Tony / Chan, Matthew T V / Sun, Xuegang / Wu, William K K

    Journal of cellular and molecular medicine

    2019  Volume 23, Issue 6, Page(s) 4290–4300

    Abstract: Impaired autophagic degradation of intracellular lipids is causally linked to the development of non-alcoholic steatohepatitis (NASH). Pharmacological agents that can restore hepatic autophagic flux could therefore have therapeutic potentials for this ... ...

    Abstract Impaired autophagic degradation of intracellular lipids is causally linked to the development of non-alcoholic steatohepatitis (NASH). Pharmacological agents that can restore hepatic autophagic flux could therefore have therapeutic potentials for this increasingly prevalent disease. Herein, we investigated the effects of polydatin, a natural precursor of resveratrol, in a murine nutritional model of NASH and a cell line model of steatosis. Results showed that oral administration of polydatin protected against hepatic lipid accumulation and alleviated inflammation and hepatocyte damage in db/db mice fed methionine-choline deficient diet. Polydatin also alleviated palmitic acid-induced lipid accumulation in cultured hepatocytes. In both models, polydatin restored lysosomal function and autophagic flux that were impaired by NASH or steatosis. Mechanistically, polydatin inhibited mTOR signalling and up-regulated the expression and activity of TFEB, a known master regulator of lysosomal function. In conclusion, polydatin ameliorated NASH through restoring autophagic flux. The polydatin-regulated autophagy was associated with inhibition of mTOR pathway and restoration of lysosomal function by TFEB. Our study provided affirmative preclinical evidence to inform future clinical trials for examining the potential anti-NASH effect of polydatin in humans.
    MeSH term(s) Animals ; Autophagy ; Disease Models, Animal ; Glucosides/pharmacology ; Humans ; Lysosomes/drug effects ; Lysosomes/physiology ; Mice ; Mice, Inbred C57BL ; Non-alcoholic Fatty Liver Disease/etiology ; Non-alcoholic Fatty Liver Disease/pathology ; Non-alcoholic Fatty Liver Disease/prevention & control ; Protective Agents/pharmacology ; Signal Transduction ; Stilbenes/pharmacology
    Chemical Substances Glucosides ; Protective Agents ; Stilbenes ; polydatin (XM261C37CQ)
    Language English
    Publishing date 2019-04-11
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2074559-X
    ISSN 1582-4934 ; 1582-4934 ; 1582-1838
    ISSN (online) 1582-4934
    ISSN 1582-4934 ; 1582-1838
    DOI 10.1111/jcmm.14320
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Cathelicidin preserves intestinal barrier function in polymicrobial sepsis.

    Ho, Jeffery / Chan, Hung / Liang, Yonghao / Liu, Xiaodong / Zhang, Lin / Li, Qing / Zhang, Yuchen / Zeng, Judeng / Ugwu, Felix N / Ho, Idy H T / Hu, Wei / Yau, Johnny C W / Wong, Sunny H / Wong, Wai Tat / Ling, Lowell / Cho, Chi H / Gallo, Richard L / Gin, Tony / Tse, Gary /
    Yu, Jun / Chan, Matthew T V / Leung, Czarina C H / Wu, William K K

    Critical care (London, England)

    2020  Volume 24, Issue 1, Page(s) 47

    Abstract: Objectives: The intestinal epithelium compartmentalizes the sterile bloodstream and the commensal bacteria in the gut. Accumulating evidence suggests that this barrier is impaired in sepsis, aggravating systemic inflammation. Previous studies reported ... ...

    Abstract Objectives: The intestinal epithelium compartmentalizes the sterile bloodstream and the commensal bacteria in the gut. Accumulating evidence suggests that this barrier is impaired in sepsis, aggravating systemic inflammation. Previous studies reported that cathelicidin is differentially expressed in various tissues in sepsis. However, its role in sepsis-induced intestinal barrier dysfunction has not been investigated.
    Design: To examine the role of cathelicidin in polymicrobial sepsis, cathelicidin wild-(Cnlp
    Results: The ileal expression of cathelicidin was increased by three-fold after CLP, peaking at 4 h. Knockout of Cnlp significantly increased 7-day mortality and was associated with a higher murine sepsis score. Alcian-blue staining revealed a reduced number of mucin-positive goblet cells, accompanied by reduced mucin expression. Increased number of apoptotic cells and cleavage of caspase-3 were observed. Cnlp deletion increased intestinal permeability to 4kD fluorescein-labeled dextran and reduced the expression of tight junction proteins claudin-1 and occludin. Notably, circulating bacterial DNA load increased more than two-fold. Transcriptome analysis revealed upregulation of cytokine/inflammatory pathway. Depletion of Cnlp induced more M1 macrophages and neutrophils compared with the wild-type mice after CLP. Mice pre-treated with cholecalciferol (an inactive form of vitamin D3) or treated with 1alpha, 25-dihydroxyvitamin D3 (an active form of VD3) had decreased 7-day mortality and significantly less severe symptoms. Intriguingly, the administration of cholecalciferol after CLP led to worsened 7-day mortality and the associated symptoms.
    Conclusions: Endogenous cathelicidin promotes intestinal barrier integrity accompanied by modulating the infiltration of neutrophils and macrophages in polymicrobial sepsis. Our data suggested that 1alpha, 25-dihydroxyvitamin D3 but not cholecalciferol is a potential therapeutic agent for treating sepsis.
    MeSH term(s) Animals ; Antimicrobial Cationic Peptides/physiology ; Intestinal Mucosa/metabolism ; Macrophages ; Male ; Mice ; Mice, Knockout ; Neutrophils ; Sepsis/physiopathology ; Vitamin D/analogs & derivatives ; Vitamin D/pharmacology
    Chemical Substances Antimicrobial Cationic Peptides ; Vitamin D (1406-16-2) ; ropocamptide (3DD771JO2H) ; 25-hydroxyvitamin D (A288AR3C9H)
    Language English
    Publishing date 2020-02-10
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2041406-7
    ISSN 1466-609X ; 1364-8535
    ISSN (online) 1466-609X
    ISSN 1364-8535
    DOI 10.1186/s13054-020-2754-5
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Germline-specific dgcr8 knockout in zebrafish using a BACK approach.

    Liu, Yun / Zhu, Zeyao / Ho, Idy H T / Shi, Yujian / Xie, Yuxin / Li, Jianzhen / Zhang, Yong / Chan, Matthew T V / Cheng, Christopher H K

    Cellular and molecular life sciences : CMLS

    2017  Volume 74, Issue 13, Page(s) 2503–2511

    Abstract: Zebrafish is an important model to study developmental biology and human diseases. However, an effective approach to achieve spatial and temporal gene knockout in zebrafish has not been well established. In this study, we have developed a new approach, ... ...

    Abstract Zebrafish is an important model to study developmental biology and human diseases. However, an effective approach to achieve spatial and temporal gene knockout in zebrafish has not been well established. In this study, we have developed a new approach, namely bacterial artificial chromosome-rescue-based knockout (BACK), to achieve conditional gene knockout in zebrafish using the Cre/loxP system. We have successfully deleted the DiGeorge syndrome critical region gene 8 (dgcr8) in zebrafish germ line and demonstrated that the maternal-zygotic dgcr8 (MZdgcr8) embryos exhibit MZdicer-like phenotypes with morphological defects which could be rescued by miR-430, indicating that canonical microRNAs play critical role in early development. Our findings establish that Cre/loxP-mediated tissue-specific gene knockout could be achieved using this BACK strategy and that canonical microRNAs play important roles in early embryonic development in zebrafish.
    MeSH term(s) Animals ; Base Sequence ; Chromosomes, Artificial, Bacterial/genetics ; Embryonic Development/genetics ; Exons/genetics ; Gene Deletion ; Gene Expression Regulation, Developmental ; Gene Knockout Techniques/methods ; Gene Targeting ; Germ Cells/metabolism ; MicroRNAs/genetics ; MicroRNAs/metabolism ; Mutation/genetics ; RNA Processing, Post-Transcriptional/genetics ; Transcription Activator-Like Effector Nucleases/metabolism ; Zebrafish/embryology ; Zebrafish/genetics ; Zebrafish Proteins/genetics ; Zebrafish Proteins/metabolism
    Chemical Substances MicroRNAs ; Zebrafish Proteins ; dgcr8 protein, zebrafish ; Transcription Activator-Like Effector Nucleases (EC 3.1.-)
    Language English
    Publishing date 2017-07
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 1358415-7
    ISSN 1420-9071 ; 1420-682X
    ISSN (online) 1420-9071
    ISSN 1420-682X
    DOI 10.1007/s00018-017-2471-7
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