LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 127

Search options

  1. Article ; Online: Structural heterogeneity of the mammalian polycomb repressor complex in immune regulation.

    Kang, Seok-Jin / Chun, Taehoon

    Experimental & molecular medicine

    2020  Volume 52, Issue 7, Page(s) 1004–1015

    Abstract: Epigenetic regulation is mainly mediated by enzymes that can modify the structure of chromatin by altering the structure of DNA or histones. Proteins involved in epigenetic processes have been identified to study the detailed molecular mechanisms ... ...

    Abstract Epigenetic regulation is mainly mediated by enzymes that can modify the structure of chromatin by altering the structure of DNA or histones. Proteins involved in epigenetic processes have been identified to study the detailed molecular mechanisms involved in the regulation of specific mRNA expression. Evolutionarily well-conserved polycomb group (PcG) proteins can function as transcriptional repressors by the trimethylation of histone H3 at the lysine 27 residue (H3K27me3) and the monoubiquitination of histone H2A at the lysine 119 residue (H2AK119ub). PcG proteins form two functionally distinct protein complexes: polycomb repressor complex 1 (PRC1) and PRC2. In mammals, the structural heterogeneity of each PRC complex is dramatically increased by several paralogs of its subunit proteins. Genetic studies with transgenic mice along with RNA-seq and chromatin immunoprecipitation (ChIP)-seq analyses might be helpful for defining the cell-specific functions of paralogs of PcG proteins. Here, we summarize current knowledge about the immune regulatory role of PcG proteins related to the compositional diversity of each PRC complex and introduce therapeutic drugs that target PcG proteins in hematopoietic malignancy.
    MeSH term(s) Animals ; Clinical Trials as Topic ; Hematologic Neoplasms/pathology ; Hematopoietic Stem Cells/cytology ; Hematopoietic Stem Cells/metabolism ; Humans ; Immunity ; Mammals/immunology ; Polycomb Repressive Complex 1/antagonists & inhibitors ; Polycomb Repressive Complex 1/chemistry ; Polycomb Repressive Complex 1/metabolism
    Chemical Substances Polycomb Repressive Complex 1 (EC 2.3.2.27)
    Language English
    Publishing date 2020-07-07
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 1328915-9
    ISSN 2092-6413 ; 1226-3613 ; 0378-8512
    ISSN (online) 2092-6413
    ISSN 1226-3613 ; 0378-8512
    DOI 10.1038/s12276-020-0462-5
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  2. Article ; Online: Porcine reproductive and respiratory syndrome virus (PRRSV) non-structural protein (NSP)1 transcriptionally inhibits CCN1 and CCN2 expression by blocking ERK-AP-1 axis in pig macrophages in vitro.

    Park, In-Byung / Chun, Taehoon

    Research in veterinary science

    2020  Volume 132, Page(s) 462–465

    Abstract: Porcine reproductive and respiratory syndrome virus (PRRSV) is a causative pathogen of PRRS that has generated a serious adverse impact on current global pork production. PRRSV primarily infects pig alveolar macrophages, but poor induction of innate ... ...

    Abstract Porcine reproductive and respiratory syndrome virus (PRRSV) is a causative pathogen of PRRS that has generated a serious adverse impact on current global pork production. PRRSV primarily infects pig alveolar macrophages, but poor induction of innate immunity after infection often leads to more severe complications. Defining the functional role of each PRRSV non structural protein (NSP) within host cells might be helpful in understanding how PRRSV induces poor innate immunity in host cells. NSP1 of PRRSV exhibits papain like cysteine protease activity and may therefore modulate host cell signaling by degrading a target protein in host cells during infection. In this study, we demonstrated that NSP1 of PRRSV-2 indirectly blocked extracellular signal-regulated kinase (ERK) signaling in polyriboinosinic polyribocytidylic acid (Poly I:C) stimulated pig macrophages (3D4/31 cells). ERK which belongs to the mitogen-activated protein kinase family mediates many biological processes including inflammatory responses during viral infection. The blocking of ERK signaling by NSP1 of PRRSV-2 further leads to the transcriptional inhibition of inflammatory enhancers, cellular communication network factor 1 and 2 (ccn1 and ccn2) through down-regulation of v-fos FBJ murine osteosarcoma viral oncogene homolog (fos) and fosb, the component of activating protein-1 (AP-1) which is an ERK downstream transcription factor. Therefore, NSP1 of PRRSV-2 inhibited the mRNA transcription of ccn1 and ccn2 by blocking the ERK-AP-1 axis in Poly I:C stimulated pig macrophages. These results provide additional evidence supporting that NSP1 has anti-inflammatory function during PRRSV-2 infection.
    MeSH term(s) Animals ; Cell Line ; Connective Tissue Growth Factor/genetics ; Connective Tissue Growth Factor/metabolism ; Cysteine-Rich Protein 61/genetics ; Cysteine-Rich Protein 61/metabolism ; Down-Regulation ; Immunity, Innate ; Macrophages ; Macrophages, Alveolar ; Mice ; Porcine respiratory and reproductive syndrome virus ; RNA, Messenger/genetics ; RNA, Messenger/metabolism ; Signal Transduction ; Swine ; Transcription Factor AP-1/genetics ; Transcription Factor AP-1/metabolism ; Viral Nonstructural Proteins/genetics ; Viral Nonstructural Proteins/metabolism
    Chemical Substances Cysteine-Rich Protein 61 ; RNA, Messenger ; Transcription Factor AP-1 ; Viral Nonstructural Proteins ; Connective Tissue Growth Factor (139568-91-5)
    Language English
    Publishing date 2020-08-05
    Publishing country England
    Document type Journal Article
    ZDB-ID 840961-4
    ISSN 1532-2661 ; 0034-5288
    ISSN (online) 1532-2661
    ISSN 0034-5288
    DOI 10.1016/j.rvsc.2020.07.029
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  3. Article: Porcine reproductive and respiratory syndrome virus (PRRSV) non-structural protein (NSP)1 transcriptionally inhibits CCN1 and CCN2 expression by blocking ERK-AP-1 axis in pig macrophages in vitro

    Park, In-Byung / Chun, Taehoon

    Research in veterinary science. 2020 Oct., v. 132

    2020  

    Abstract: Porcine reproductive and respiratory syndrome virus (PRRSV) is a causative pathogen of PRRS that has generated a serious adverse impact on current global pork production. PRRSV primarily infects pig alveolar macrophages, but poor induction of innate ... ...

    Abstract Porcine reproductive and respiratory syndrome virus (PRRSV) is a causative pathogen of PRRS that has generated a serious adverse impact on current global pork production. PRRSV primarily infects pig alveolar macrophages, but poor induction of innate immunity after infection often leads to more severe complications. Defining the functional role of each PRRSV non structural protein (NSP) within host cells might be helpful in understanding how PRRSV induces poor innate immunity in host cells. NSP1 of PRRSV exhibits papain like cysteine protease activity and may therefore modulate host cell signaling by degrading a target protein in host cells during infection. In this study, we demonstrated that NSP1 of PRRSV-2 indirectly blocked extracellular signal-regulated kinase (ERK) signaling in polyriboinosinic polyribocytidylic acid (Poly I:C) stimulated pig macrophages (3D4/31 cells). ERK which belongs to the mitogen-activated protein kinase family mediates many biological processes including inflammatory responses during viral infection. The blocking of ERK signaling by NSP1 of PRRSV-2 further leads to the transcriptional inhibition of inflammatory enhancers, cellular communication network factor 1 and 2 (ccn1 and ccn2) through down-regulation of v-fos FBJ murine osteosarcoma viral oncogene homolog (fos) and fosb, the component of activating protein-1 (AP-1) which is an ERK downstream transcription factor. Therefore, NSP1 of PRRSV-2 inhibited the mRNA transcription of ccn1 and ccn2 by blocking the ERK-AP-1 axis in Poly I:C stimulated pig macrophages. These results provide additional evidence supporting that NSP1 has anti-inflammatory function during PRRSV-2 infection.
    Keywords Betaarterivirus suid 2 ; enzyme activity ; innate immunity ; macrophages ; mice ; mitogen-activated protein kinase ; oncogenes ; osteosarcoma ; papain ; pathogens ; polyinosinic-polycytidylic acid ; porcine reproductive and respiratory syndrome ; pork ; research ; structural proteins ; swine ; transcription (genetics) ; transcription factors ; veterinary medicine ; viral nonstructural proteins ; viruses
    Language English
    Dates of publication 2020-10
    Size p. 462-465.
    Publishing place Elsevier Ltd
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 840961-4
    ISSN 1532-2661 ; 0034-5288
    ISSN (online) 1532-2661
    ISSN 0034-5288
    DOI 10.1016/j.rvsc.2020.07.029
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

  4. Article ; Online: Open reading frame 5 protein of porcine circovirus type 2 induces RNF128 (GRAIL) which inhibits mRNA transcription of interferon-β in porcine epithelial cells.

    Kang, Seok-Jin / Park, In-Byung / Chun, Taehoon

    Research in veterinary science

    2021  Volume 140, Page(s) 79–82

    Abstract: A previous study has indicated that mRNA transcript of Rnf128 (Grail) is significantly increased in porcine epithelial cells expressing porcine circovirus type 2 (PCV2) open reading frame 5 (ORF5). RNF128 is an E3 ubiquitin ligase that can modulate the ... ...

    Abstract A previous study has indicated that mRNA transcript of Rnf128 (Grail) is significantly increased in porcine epithelial cells expressing porcine circovirus type 2 (PCV2) open reading frame 5 (ORF5). RNF128 is an E3 ubiquitin ligase that can modulate the activity of target protein via ubiquitination of specific lysine residues. However, the function of RNF128 in PCV2-infected epithelial cells has not been well studied yet. Thus, the objective of the present study was to examine the functional role of RNF128 in porcine epithelial cells (PK15 cells) after PCV2 infection. Results clearly indicated that PCV2 ORF5 increased the expression of RNF128 which inhibited type I IFN production and enhanced viral replication of PCV2 in PK15 cells. Therefore, up-regulating RNF128 by PCV2 ORF5 can help PCV2 circumvent initial immune surveillance of porcine epithelial cells.
    MeSH term(s) Animals ; Cell Line ; Circoviridae Infections/veterinary ; Circovirus/genetics ; Epithelial Cells ; Interferons ; Open Reading Frames ; RNA, Messenger/genetics ; Swine ; Swine Diseases ; Virus Replication
    Chemical Substances RNA, Messenger ; Interferons (9008-11-1)
    Language English
    Publishing date 2021-08-13
    Publishing country England
    Document type Journal Article
    ZDB-ID 840961-4
    ISSN 1532-2661 ; 0034-5288
    ISSN (online) 1532-2661
    ISSN 0034-5288
    DOI 10.1016/j.rvsc.2021.08.002
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  5. Article: Interaction between host cell proteins and open reading frames of porcine circovirus type 2.

    Park, Si-Won / Park, In-Byung / Kang, Seok-Jin / Bae, Joonbeom / Chun, Taehoon

    Journal of animal science and technology

    2023  Volume 65, Issue 4, Page(s) 698–719

    Abstract: Postweaning multisystemic wasting syndrome (PMWS) is caused by a systemic inflammation after porcine circovirus type 2 (PCV2) infection. It was one of the most economically important pathogens affecting pig production worldwide before PCV2 vaccine was ... ...

    Abstract Postweaning multisystemic wasting syndrome (PMWS) is caused by a systemic inflammation after porcine circovirus type 2 (PCV2) infection. It was one of the most economically important pathogens affecting pig production worldwide before PCV2 vaccine was first introduced in 2006. After the development of a vaccine against PCV2a type, pig farms gradually restored enormous economic losses from PMWS. However, vaccine against PCV2a type could not be fully effective against several different PCV2 genotypes (PCV2b - PCV2h). In addition, PCV2a vaccine itself could generate antigenic drift of PCV2 capsid. Therefore, PCV2 infection still threats pig industry worldwide. PCV2 infection was initially found in local tissues including reproductive, respiratory, and digestive tracks. However, PCV2 infection often leads to a systemic inflammation which can cause severe immunosuppression by depleting peripheral lymphocytes in secondary lymphoid tissues. Subsequently, a secondary infection with other microorganisms can cause PMWS. Eleven putative open reading frames (ORFs) have been predicted to encode PCV2 genome. Among them, gene products of six ORFs from ORF1 to ORF6 have been identified and characterized to estimate its functional role during PCV2 infection. Acquiring knowledge about the specific interaction between each PCV2 ORF protein and host protein might be a key to develop preventive or therapeutic tools to control PCV2 infection. In this article, we reviewed current understanding of how each ORF of PCV2 manipulates host cell signaling related to immune suppression caused by PCV2.
    Language English
    Publishing date 2023-07-30
    Publishing country Korea (South)
    Document type Journal Article ; Review
    ZDB-ID 2775231-8
    ISSN 2055-0391
    ISSN 2055-0391
    DOI 10.5187/jast.2023.e67
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  6. Article ; Online: Anti-Inflammatory Role of TAM Family of Receptor Tyrosine Kinases Via Modulating Macrophage Function.

    Lee, Chang-Hee / Chun, Taehoon

    Molecules and cells

    2019  Volume 42, Issue 1, Page(s) 1–7

    Abstract: Macrophage is an important innate immune cell that not only initiates inflammatory responses, but also functions in tissue repair and anti-inflammatory responses. Regulating macrophage activity is thus critical to maintain immune homeostasis. Tyro3, Axl, ...

    Abstract Macrophage is an important innate immune cell that not only initiates inflammatory responses, but also functions in tissue repair and anti-inflammatory responses. Regulating macrophage activity is thus critical to maintain immune homeostasis. Tyro3, Axl, and Mer are integral membrane proteins that constitute TAM family of receptor tyrosine kinases (RTKs). Growing evidence indicates that TAM family receptors play an important role in anti-inflammatory responses through modulating the function of macrophages. First, macrophages can recognize apoptotic bodies through interaction between TAM family receptors expressed on macrophages and their ligands attached to apoptotic bodies. Without TAM signaling, macrophages cannot clear up apoptotic cells, leading to broad inflammation due to over-activation of immune cells. Second, TAM signaling can prevent chronic activation of macrophages by attenuating inflammatory pathways through particular pattern recognition receptors and cytokine receptors. Third, TAM signaling can induce autophagy which is an important mechanism to inhibit NLRP3 inflammasome activation in macrophages. Fourth, TAM signaling can inhibit polarization of M1 macrophages. In this review, we will focus on mechanisms involved in how TAM family of RTKs can modulate function of macrophage associated with anti-inflammatory responses described above. We will also discuss several human diseases related to TAM signaling and potential therapeutic strategies of targeting TAM signaling.
    MeSH term(s) Animals ; Anti-Inflammatory Agents/metabolism ; Apoptosis ; Humans ; Inflammasomes/metabolism ; Ligands ; Macrophages/metabolism ; Receptor Protein-Tyrosine Kinases/metabolism
    Chemical Substances Anti-Inflammatory Agents ; Inflammasomes ; Ligands ; Receptor Protein-Tyrosine Kinases (EC 2.7.10.1)
    Language English
    Publishing date 2019-01-02
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 1148964-9
    ISSN 0219-1032 ; 1016-8478
    ISSN (online) 0219-1032
    ISSN 1016-8478
    DOI 10.14348/molcells.2018.0419
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  7. Article: Open reading frame 5 protein of porcine circovirus type 2 induces RNF128 (GRAIL) which inhibits mRNA transcription of interferon-β in porcine epithelial cells

    Kang, Seok-Jin / Park, In-Byung / Chun, Taehoon

    Research in veterinary science. 2021 Nov., v. 140

    2021  

    Abstract: A previous study has indicated that mRNA transcript of Rnf128 (Grail) is significantly increased in porcine epithelial cells expressing porcine circovirus type 2 (PCV2) open reading frame 5 (ORF5). RNF128 is an E3 ubiquitin ligase that can modulate the ... ...

    Abstract A previous study has indicated that mRNA transcript of Rnf128 (Grail) is significantly increased in porcine epithelial cells expressing porcine circovirus type 2 (PCV2) open reading frame 5 (ORF5). RNF128 is an E3 ubiquitin ligase that can modulate the activity of target protein via ubiquitination of specific lysine residues. However, the function of RNF128 in PCV2-infected epithelial cells has not been well studied yet. Thus, the objective of the present study was to examine the functional role of RNF128 in porcine epithelial cells (PK15 cells) after PCV2 infection. Results clearly indicated that PCV2 ORF5 increased the expression of RNF128 which inhibited type I IFN production and enhanced viral replication of PCV2 in PK15 cells. Therefore, up-regulating RNF128 by PCV2 ORF5 can help PCV2 circumvent initial immune surveillance of porcine epithelial cells.
    Keywords Porcine circovirus-2 ; epithelium ; lysine ; monitoring ; research ; swine ; ubiquitin-protein ligase ; ubiquitination ; veterinary medicine ; virus replication
    Language English
    Dates of publication 2021-11
    Size p. 79-82.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 840961-4
    ISSN 1532-2661 ; 0034-5288
    ISSN (online) 1532-2661
    ISSN 0034-5288
    DOI 10.1016/j.rvsc.2021.08.002
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

  8. Article ; Online: Monitoring mRNA Expression Patterns in Macrophages in Response to Two Different Strains of Probiotics.

    Choi, Sang-Pil / Park, Si-Won / Kang, Seok-Jin / Lim, Seul Ki / Kwon, Min-Sung / Choi, Hak-Jong / Chun, Taehoon

    Food science of animal resources

    2023  Volume 43, Issue 4, Page(s) 703–711

    Abstract: As an initial study to elucidate the molecular mechanism of how probiotics modulate macrophage activity, we monitored mRNA expression patterns in peritoneal macrophages (PMs) treated with two different strains of probiotics. After treatment with ... ...

    Abstract As an initial study to elucidate the molecular mechanism of how probiotics modulate macrophage activity, we monitored mRNA expression patterns in peritoneal macrophages (PMs) treated with two different strains of probiotics. After treatment with either
    Language English
    Publishing date 2023-07-01
    Publishing country Korea (South)
    Document type Journal Article
    ZDB-ID 3016289-0
    ISSN 2636-0780 ; 2636-0772
    ISSN (online) 2636-0780
    ISSN 2636-0772
    DOI 10.5851/kosfa.2023.e23
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  9. Article: Expression of Major Histocompatibility Complex during Neuronal Differentiation of Somatic Cell Nuclear Transfer-Human Embryonic Stem Cells.

    Lee, Jin Saem / Lee, Jeoung Eun / Yu, Shin-Hye / Chun, Taehoon / Chang, Mi-Yoon / Lee, Dong Ryul / Park, Chang-Hwan

    International journal of stem cells

    2023  Volume 17, Issue 1, Page(s) 59–69

    Abstract: Human pluripotent stem cells (hPSCs) such as human embryonic stem cells (hESCs), induced pluripotent stem cells, and somatic cell nuclear transfer (SCNT)-hESCs can permanently self-renew while maintaining their capacity to differentiate into any type of ... ...

    Abstract Human pluripotent stem cells (hPSCs) such as human embryonic stem cells (hESCs), induced pluripotent stem cells, and somatic cell nuclear transfer (SCNT)-hESCs can permanently self-renew while maintaining their capacity to differentiate into any type of somatic cells, thereby serving as an important cell source for cell therapy. However, there are persistent challenges in the application of hPSCs in clinical trials, where one of the most significant is graft rejection by the patient immune system in response to human leukocyte antigen (HLA) mismatch when transplants are obtained from an allogeneic (non-self) cell source. Homozygous SCNT-hESCs (homo-SCNT-hESCs) were used to simplify the clinical application and to reduce HLA mismatch. Here, we present a xeno-free protocol that confirms the efficient generation of neural precursor cells in hPSCs and also the differentiation of dopaminergic neurons. Additionally, there was no difference when comparing the HLA expression patterns of hESC, homo-SCNT-hESCs and hetero-SCNT-hESCs. We propose that there are no differences in the differentiation capacity and HLA expression among hPSCs that can be cultured
    Language English
    Publishing date 2023-10-26
    Publishing country Korea (South)
    Document type Journal Article
    ZDB-ID 2914134-5
    ISSN 2005-5447 ; 2005-3606
    ISSN (online) 2005-5447
    ISSN 2005-3606
    DOI 10.15283/ijsc23037
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  10. Article: Transcriptome analysis of pig macrophages expressing porcine reproductive and respiratory syndrome virus non-structural protein 1

    Park, In-Byung / Choi, Yong-Chan / Lee, Kyung-Tai / Chun, Taehoon

    Veterinary immunology and immunopathology. 2021 Jan., v. 231

    2021  

    Abstract: Porcine reproductive and respiratory syndrome virus (PRRSV) is a causative pathogen of PRRS, one of the most economically disastrous swine diseases. Non-structural protein 1 (NSP1) of PRRSV consists of NSP1α and NSP1β which exhibit papain like cysteine ... ...

    Abstract Porcine reproductive and respiratory syndrome virus (PRRSV) is a causative pathogen of PRRS, one of the most economically disastrous swine diseases. Non-structural protein 1 (NSP1) of PRRSV consists of NSP1α and NSP1β which exhibit papain like cysteine protease activity. Recent evidence demonstrates that PRRSV NSP1 may be participated in modulating host immunity, but very few host proteins were discovered as targets for NSP1. In this study, we used RNA-seq to investigate the functional role of PRRSV NSP1 in porcine alveolar macrophages, 3D4/31 cells. Compared to empty vector (mock) transfectant, NSP1, NSP1α, and NSP1β expressing 3D4/31 cells displayed a total of 60 genes, 63 genes, and 80 genes as differentially expressed genes (DEGs), respectively. Most of DEGs are involved in early inflammatory responses including interleukin (IL)-17 signaling pathway, chemokine signaling pathway, tumor necrosis factor (TNF)-α signaling pathway, and cell adhesion molecules. Interestingly, PRRSV NSP1 expression in 3D4/31 cells decreased mRNA transcripts of Fosb and Gdf15 known to be involved in host cell signaling or host cell protection during inflammation. Therefore, PRRSV NSP1 might block the signaling involved in host immune surveillance. Further study is required to define the mechanism on how PRRSV NSP1 protein represses mRNA transcripts of specific host genes.
    Keywords cell adhesion ; chemokines ; enzyme activity ; gene expression regulation ; immunity ; immunopathology ; inflammation ; macrophages ; monitoring ; papain ; pathogens ; porcine reproductive and respiratory syndrome ; sequence analysis ; swine ; transcriptomics ; viral nonstructural proteins ; viruses
    Language English
    Dates of publication 2021-01
    Publishing place Elsevier B.V.
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 754160-0
    ISSN 1873-2534 ; 0165-2427
    ISSN (online) 1873-2534
    ISSN 0165-2427
    DOI 10.1016/j.vetimm.2020.110147
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

To top