LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 38

Search options

  1. Article ; Online: Advances in Gene Therapy Techniques to Treat

    Chung, Sun-Ku / Lee, Seo-Young

    Biomolecules

    2022  Volume 12, Issue 12

    Abstract: Leucine-rich repeat kinase 2 ( ...

    Abstract Leucine-rich repeat kinase 2 (
    Language English
    Publishing date 2022-12-05
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2701262-1
    ISSN 2218-273X ; 2218-273X
    ISSN (online) 2218-273X
    ISSN 2218-273X
    DOI 10.3390/biom12121814
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  2. Article: Caffeic acid selectively eliminates teratogenic human-induced pluripotent stem cells via apoptotic cell death

    Kim, Aeyung / Lee, Seo-Young / Chung, Sun-Ku

    Phytomedicine. 2022 July 20, v. 102

    2022  

    Abstract: Induced pluripotent stem cells (iPSCs) generated from reprogrammed adult somatic cells are considered as a promising cell source in cell-based regenerative medicine. To avoid teratoma formation, which is a safety issue in iPSC-based cell therapy, it is ... ...

    Abstract Induced pluripotent stem cells (iPSCs) generated from reprogrammed adult somatic cells are considered as a promising cell source in cell-based regenerative medicine. To avoid teratoma formation, which is a safety issue in iPSC-based cell therapy, it is important to selectively remove undifferentiated iPSCs that remain in the differentiated cell product before in vivo transplantation. Caffeic acid (CAA, 3,4-dihydroxy-cinnamic acid) is a phenolic compound synthesized from various vegetables, fruits, and herbs; it has shown various pharmacological activities against inflammation, cancer, infection, diabetes, and neurodegenerative diseases. However, the beneficial effects of CAA in iPSC-based cell therapy, such as the selective elimination of iPSCs and anti-teratoma effects, have not yet been explored. Here, we found that CAA induced apoptotic cell death in iPSCs; this process did not occur in iPSC-derived mesenchymal progenitor cells (MPCs) or human dermal fibroblast (hDFs). Under co-culture conditions with MPCs and hDFs, CAA treatment selectively removed iPSCs. In addition, CAA treatment in mixed cell culture with iPSCs and MPCs prior to grafting markedly suppressed iPSC-derived teratoma formation. Finally, CAA did not induce DNA damage in MPCs or hDFs. Taken together, these results suggest that CAA is effective in preparing safe iPSC-based therapeutic cells without the risk of teratoma formation and DNA damage in normal cells and iPSC-derived differentiated cells.
    Keywords DNA damage ; adults ; apoptosis ; caffeic acid ; coculture ; diabetes ; fibroblasts ; humans ; inflammation ; medicine ; risk ; teratogenicity ; therapeutics
    Language English
    Dates of publication 2022-0720
    Publishing place Elsevier GmbH
    Document type Article
    ZDB-ID 1205240-1
    ISSN 1618-095X ; 0944-7113
    ISSN (online) 1618-095X
    ISSN 0944-7113
    DOI 10.1016/j.phymed.2022.154144
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

  3. Article ; Online: Caffeic acid selectively eliminates teratogenic human-induced pluripotent stem cells via apoptotic cell death.

    Kim, Aeyung / Lee, Seo-Young / Chung, Sun-Ku

    Phytomedicine : international journal of phytotherapy and phytopharmacology

    2022  Volume 102, Page(s) 154144

    Abstract: Background: Induced pluripotent stem cells (iPSCs) generated from reprogrammed adult somatic cells are considered as a promising cell source in cell-based regenerative medicine. To avoid teratoma formation, which is a safety issue in iPSC-based cell ... ...

    Abstract Background: Induced pluripotent stem cells (iPSCs) generated from reprogrammed adult somatic cells are considered as a promising cell source in cell-based regenerative medicine. To avoid teratoma formation, which is a safety issue in iPSC-based cell therapy, it is important to selectively remove undifferentiated iPSCs that remain in the differentiated cell product before in vivo transplantation. Caffeic acid (CAA, 3,4-dihydroxy-cinnamic acid) is a phenolic compound synthesized from various vegetables, fruits, and herbs; it has shown various pharmacological activities against inflammation, cancer, infection, diabetes, and neurodegenerative diseases. However, the beneficial effects of CAA in iPSC-based cell therapy, such as the selective elimination of iPSCs and anti-teratoma effects, have not yet been explored.
    Results: Here, we found that CAA induced apoptotic cell death in iPSCs; this process did not occur in iPSC-derived mesenchymal progenitor cells (MPCs) or human dermal fibroblast (hDFs). Under co-culture conditions with MPCs and hDFs, CAA treatment selectively removed iPSCs. In addition, CAA treatment in mixed cell culture with iPSCs and MPCs prior to grafting markedly suppressed iPSC-derived teratoma formation. Finally, CAA did not induce DNA damage in MPCs or hDFs.
    Conclusion: Taken together, these results suggest that CAA is effective in preparing safe iPSC-based therapeutic cells without the risk of teratoma formation and DNA damage in normal cells and iPSC-derived differentiated cells.
    MeSH term(s) Adult ; Apoptosis ; Caffeic Acids ; Cell Differentiation ; Humans ; Induced Pluripotent Stem Cells ; Teratogens/metabolism ; Teratogens/pharmacology ; Teratoma/drug therapy
    Chemical Substances Caffeic Acids ; Teratogens ; caffeic acid (U2S3A33KVM)
    Language English
    Publishing date 2022-05-03
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1205240-1
    ISSN 1618-095X ; 0944-7113
    ISSN (online) 1618-095X
    ISSN 0944-7113
    DOI 10.1016/j.phymed.2022.154144
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  4. Article ; Online: Differential Transcriptional Regulation of Polymorphic p53 Codon 72 in Metabolic Pathways.

    Kim, Bu-Yeo / Lee, Seo-Young / Chung, Sun-Ku

    International journal of molecular sciences

    2021  Volume 22, Issue 19

    Abstract: p53 is a transcription factor that is activated under DNA damage stress and regulates the expression of proapoptotic genes including the expression of growth arrest genes to subsequently determine the fate of cells. To investigate the functional ... ...

    Abstract p53 is a transcription factor that is activated under DNA damage stress and regulates the expression of proapoptotic genes including the expression of growth arrest genes to subsequently determine the fate of cells. To investigate the functional differences of polymorphic p53 codon 72, we constructed isogenic lines encoding each polymorphic p53 codon 72 based on induced pluripotent stem cells, which can endogenously express each polymorphic p53 protein only, encoding either the arginine 72 (R72) variant or proline 72 (P72) variant, respectively. We found that there was no significant functional difference between P72 and R72 cells in growth arrest or apoptosis as a representative function of p53. In the comprehensive analysis, the expression pattern of the common p53 target genes, including cell cycle arrest or apoptosis, was also increased regardless of the polymorphic p53 codon 72 status, whereas the expression pattern involved in metabolism was decreased and more significant in R72 than in P72 cells. This study noted that polymorphic p53 codon 72 differentially regulated the functional categories of metabolism and not the pathways that determine cell fate, such as growth arrest and apoptosis in cells exposed to genotoxic stress.
    MeSH term(s) Biomarkers/metabolism ; Cells, Cultured ; Codon ; Gene Expression Profiling ; Gene Expression Regulation ; Humans ; Induced Pluripotent Stem Cells/cytology ; Induced Pluripotent Stem Cells/metabolism ; Metabolic Networks and Pathways ; Polymorphism, Single Nucleotide ; Tumor Suppressor Protein p53/genetics
    Chemical Substances Biomarkers ; Codon ; TP53 protein, human ; Tumor Suppressor Protein p53
    Language English
    Publishing date 2021-10-06
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms221910793
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  5. Article ; Online: An Ethanol Extract of

    Kim, Aeyung / Baek, Su-Jin / Shin, Sarah / Lee, Seo-Young / Chung, Sun-Ku

    Nutrients

    2023  Volume 15, Issue 10

    Abstract: In cell-based regenerative medicine, induced pluripotent stem cells (iPSCs) generated from reprogrammed adult somatic cells have emerged as a useful cell source due to the lack of ethical concerns and the low risk of immune rejection. To address the risk ...

    Abstract In cell-based regenerative medicine, induced pluripotent stem cells (iPSCs) generated from reprogrammed adult somatic cells have emerged as a useful cell source due to the lack of ethical concerns and the low risk of immune rejection. To address the risk of teratoma formation, which is a safety issue in iPSC-based cell therapy, it is essential to selectively remove undifferentiated iPSCs remaining in the iPSC-derived differentiated cell product prior to in vivo transplantation. In this study, we explored whether an ethanol extract of coptidis rhizoma (ECR) exhibited anti-teratoma activity and identified the active components involved in the selective elimination of undifferentiated iPSCs. Transcriptome analysis of iPSCs confirmed that cell death-related pathways were significantly altered by ECR treatment. Our results demonstrate that ECR effectively induced apoptotic cell death and DNA damage in iPSCs, and that reactive oxygen species generation, mitochondrial damage, caspase activation, and p53 activation were involved in ECR-mediated iPSC death. However, in iPSC-derived differentiated cells (iPSC-Diff), reduced cell viability and the DNA damage response were not observed after ECR treatment. We co-cultured iPSCs and iPSC-Diff and found that ECR treatment selectively removed iPSCs, whereas iPSC-Diff remained intact. Prior to in ovo implantation, ECR treatment of a mixed cell culture of iPSCs and iPSC-Diff significantly suppressed iPSC-derived teratoma formation. Among the main components of the ECR, berberine and coptisine showed selective cytotoxicity to iPSCs but not to iPSC-Diff. Together, these results indicate the usefulness of ECRs in preparing safe and effective iPSC-based therapeutic cell products with no risk of teratoma formation.
    MeSH term(s) Humans ; Adult ; Induced Pluripotent Stem Cells/metabolism ; Drugs, Chinese Herbal/pharmacology ; Ethanol/pharmacology ; Apoptosis ; Cell Differentiation
    Chemical Substances Drugs, Chinese Herbal ; Ethanol (3K9958V90M)
    Language English
    Publishing date 2023-05-18
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2518386-2
    ISSN 2072-6643 ; 2072-6643
    ISSN (online) 2072-6643
    ISSN 2072-6643
    DOI 10.3390/nu15102364
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  6. Article ; Online: Generation of gene-corrected iPSC line, KIOMi002-A, from Parkinson's disease patient iPSC with LRRK2 G2019S mutation using BAC-based homologous recombination.

    Lee, Seo-Young / Chung, Sun-Ku

    Stem cell research

    2019  Volume 41, Page(s) 101649

    Abstract: Mutations in leucine-rich repeat kinase 2 (LRRK2) gene (LRRK2 G2019S) is a representative autosomal dominant mutation that can cause Parkinson's disease (PD). A bacterial artificial chromosome-based homologous recombination (BAC-based HR) system was ... ...

    Abstract Mutations in leucine-rich repeat kinase 2 (LRRK2) gene (LRRK2 G2019S) is a representative autosomal dominant mutation that can cause Parkinson's disease (PD). A bacterial artificial chromosome-based homologous recombination (BAC-based HR) system was utilized for gene therapy of LRRK2 G2019S-mutant induced pluripotent stem cells (iPSCs) produced by reprogramming episomal vectors. The gene-corrected iPSCs retained typical pluripotency required for their spontaneous differentiation into differentiated cells. The iPSCs had a normal karyotype and were confirmed to have no off-target sites by melting curve analysis.
    MeSH term(s) Adult ; Base Sequence ; Cell Culture Techniques/methods ; Cell Line/pathology ; Chromosomes, Artificial, Bacterial/genetics ; Homologous Recombination/genetics ; Humans ; Induced Pluripotent Stem Cells/pathology ; Leucine-Rich Repeat Serine-Threonine Protein Kinase-2/genetics ; Male ; Mutation/genetics ; Parkinson Disease/pathology ; Reproducibility of Results
    Chemical Substances LRRK2 protein, human (EC 2.7.11.1) ; Leucine-Rich Repeat Serine-Threonine Protein Kinase-2 (EC 2.7.11.1)
    Language English
    Publishing date 2019-11-06
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1876-7753
    ISSN (online) 1876-7753
    DOI 10.1016/j.scr.2019.101649
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  7. Article ; Online: Prunellae Spica Extract Suppresses Teratoma Formation of Pluripotent Stem Cells through p53-Mediated Apoptosis.

    Kim, Aeyung / Lee, Seo-Young / Seo, Chang-Seob / Chung, Sun-Ku

    Nutrients

    2020  Volume 12, Issue 3

    Abstract: Induced pluripotent stem cells (iPSCs) have similar properties to embryonic stem cells in terms of indefinite self-renewal and differentiation capacity. After in vitro differentiation of iPSCs, undifferentiated iPSCs (USCs) may exist in cell therapy ... ...

    Abstract Induced pluripotent stem cells (iPSCs) have similar properties to embryonic stem cells in terms of indefinite self-renewal and differentiation capacity. After in vitro differentiation of iPSCs, undifferentiated iPSCs (USCs) may exist in cell therapy material and can form teratomas after in vivo transplantation. Selective elimination of residual USCs is, therefore, very important. Prunellae Spica (PS) is a traditional medicinal plant that has been shown to exert anti-cancer, antioxidant, and anti-inflammatory activities; however, its effects on iPSCs have not been previously characterized. In this study, we find that ethanol extract of PS (EPS) effectively induces apoptotic cell death of USCs through G2/M cell cycle arrest, generation of intracellular reactive oxygen species, alteration of mitochondrial membrane potentials, and caspase activation of USCs. In addition, EPS increases p53 accumulation and expression of its downstream targets. In p53 knockout (KO) iPSCs, the EPS did not induce apoptosis, indicating that EPS-mediated apoptosis of USCs was p53-dependent. In addition, EPS was not genotoxic towards iPSCs-derived differentiated cells. EPS treatment before injection efficiently prevented in ovo teratoma formation of p53 wild-type (WT) iPSCs but not p53KO iPSCs. Collectively, these results indicate that EPS has potent anti-teratoma activity and no genotoxicity to differentiated cells. It can, therefore, be used in the development of safe and efficient iPSC-based cell therapies.
    MeSH term(s) Apoptosis/drug effects ; Cells, Cultured ; Humans ; Plant Extracts/pharmacology ; Pluripotent Stem Cells/drug effects ; Prunella/chemistry ; Teratoma/prevention & control ; Tumor Suppressor Protein p53/metabolism
    Chemical Substances Plant Extracts ; Tumor Suppressor Protein p53
    Language English
    Publishing date 2020-03-09
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2518386-2
    ISSN 2072-6643 ; 2072-6643
    ISSN (online) 2072-6643
    ISSN 2072-6643
    DOI 10.3390/nu12030721
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  8. Article ; Online: Elimination of Teratogenic Human Induced Pluripotent Stem Cells by Bee Venom via Calcium-Calpain Pathway.

    Kim, Aeyung / Lee, Seo-Young / Kim, Bu-Yeo / Chung, Sun-Ku

    International journal of molecular sciences

    2020  Volume 21, Issue 9

    Abstract: Induced pluripotent stem cells (iPSCs) are regarded as a promising option for cell-based regenerative medicine. To obtain safe and efficient iPSC-based cell products, it is necessary to selectively eliminate the residual iPSCs prior to in vivo ... ...

    Abstract Induced pluripotent stem cells (iPSCs) are regarded as a promising option for cell-based regenerative medicine. To obtain safe and efficient iPSC-based cell products, it is necessary to selectively eliminate the residual iPSCs prior to in vivo implantation due to the risk of teratoma formation. Bee venom (BV) has long been used in traditional Chinese medicine to treat inflammatory diseases and relieve pain, and has been shown to exhibit anti-cancer, anti-mutagenic, anti-nociceptive, and radioprotective activities. However, the potential benefits of BV in iPSC therapy, particularly its anti-teratoma activity, have not been examined. In this study, we found that BV selectively induced cell death in iPSCs, but not in iPSC-derived differentiated cells (iPSCs-Diff). BV rapidly disrupted cell membrane integrity and focal adhesions, followed by induction of apoptosis and necroptosis in iPSCs. We also found that BV remarkably enhanced intracellular calcium levels, calpain activation, and reactive oxygen speciesgeneration in iPSCs. BV treatment before in ovo grafting efficiently prevented iPSC-derived teratoma formation. In contrast, no DNA damage was observed in iPSCs-Diff following BV treatment, further demonstrating the safety of BV for use with iPSCs-Diff. Taken together, these findings show that BV has potent anti-teratoma activity by eliminating residual iPSCs, and can be used for the development of effective and safe iPSC-based cell therapies.
    MeSH term(s) Apoptosis/drug effects ; Bee Venoms/pharmacology ; Biomarkers ; Calcium/metabolism ; Calpain/metabolism ; Cell Membrane/drug effects ; Cell Membrane/metabolism ; Humans ; Induced Pluripotent Stem Cells/drug effects ; Induced Pluripotent Stem Cells/metabolism ; Reactive Oxygen Species/metabolism ; Signal Transduction/drug effects ; Teratogenesis/drug effects ; Teratogenesis/genetics
    Chemical Substances Bee Venoms ; Biomarkers ; Reactive Oxygen Species ; Calpain (EC 3.4.22.-) ; Calcium (SY7Q814VUP)
    Language English
    Publishing date 2020-05-05
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms21093265
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  9. Article ; Online: Ethanol extract of Magnoliae cortex (EEMC) limits teratoma formation of pluripotent stem cells by selective elimination of undifferentiated cells through the p53-dependent mitochondrial apoptotic pathway.

    Kim, Aeyung / Lee, Seo-Young / Seo, Chang-Seob / Chung, Sun-Ku

    Phytomedicine : international journal of phytotherapy and phytopharmacology

    2020  Volume 69, Page(s) 153198

    Abstract: Background: Induced pluripotent stem cells (iPSCs) are regarded as the best potential cell source for cell-based regenerative medicine. To develop a safe and efficient iPSC-based cell therapy, it is very important to avoid possible teratoma formation, ... ...

    Abstract Background: Induced pluripotent stem cells (iPSCs) are regarded as the best potential cell source for cell-based regenerative medicine. To develop a safe and efficient iPSC-based cell therapy, it is very important to avoid possible teratoma formation, which can arise from undifferentiated iPSCs (USCs) remaining among differentiated cell products. Dried bark of Magnolia officinalis (Magnolia cortex, MC) has long been used in traditional medicine to treat gastrointestinal ailments and allergic diseases, and has shown have various pharmacological activities, including anti-bacterial, anti-inflammatory, and anti-cancer effects. However, its effects on iPSCs have not yet been examined.
    Purpose: In this study, we investigated the selective cytotoxic effects of ethanol extract of MC (EEMC) on undifferentiated iPSCs and elucidated the underlying apoptotic mechanisms in detail. We also investigated the inhibitory effects of EEMC on teratoma formation via in ovo experiments.
    Results: We found that EEMC greatly reduced cell growth and induced apoptotic cell death in USCs, but not in differentiated or normal cells. EEMC caused G2/M cell cycle arrest, mitochondrial damage, and caspase activation of USCs, accompanied by p53 accumulation. In p53KO human iPSCs, EEMC had no cytotoxicity, reinforcing that EEMC-mediated apoptosis of USCs is p53-dependent. EEMC did not cause DNA damage in iPSC-derived differentiated cells. In ovo teratoma formation assay revealed that EEMC treatment before injection efficiently eliminated USCs and prevented teratoma formation.
    Conclusions: These results collectively indicate that EEMC has potent anti-teratoma activity, and therefore can be used for the development of safe iPSC-based therapy.
    MeSH term(s) Animals ; Apoptosis/drug effects ; Caspases/metabolism ; Cell Cycle Checkpoints/drug effects ; Cell Differentiation/drug effects ; Cells, Cultured ; Chick Embryo ; Ethanol/chemistry ; Hepatocytes/cytology ; Hepatocytes/physiology ; Humans ; Induced Pluripotent Stem Cells/cytology ; Induced Pluripotent Stem Cells/drug effects ; Induced Pluripotent Stem Cells/pathology ; Induced Pluripotent Stem Cells/physiology ; Magnolia/chemistry ; Mice ; Mitochondria/drug effects ; Mitochondria/pathology ; Plant Extracts/chemistry ; Plant Extracts/pharmacology ; Teratoma/pathology ; Teratoma/prevention & control ; Tumor Suppressor Protein p53/genetics ; Tumor Suppressor Protein p53/metabolism
    Chemical Substances Plant Extracts ; TP53 protein, human ; Tumor Suppressor Protein p53 ; Ethanol (3K9958V90M) ; Caspases (EC 3.4.22.-)
    Language English
    Publishing date 2020-02-26
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1205240-1
    ISSN 1618-095X ; 0944-7113
    ISSN (online) 1618-095X
    ISSN 0944-7113
    DOI 10.1016/j.phymed.2020.153198
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  10. Article: Integrating Gene Correction in the Reprogramming and Transdifferentiation Processes: A One-Step Strategy to Overcome Stem Cell-Based Gene Therapy Limitations.

    Lee, Seo-Young / Chung, Sun-Ku

    Stem cells international

    2016  Volume 2016, Page(s) 2725670

    Abstract: The recent advent of induced pluripotent stem cells (iPSCs) and gene therapy tools has raised the possibility of autologous cell therapy for rare genetic diseases. However, cellular reprogramming is inefficient in certain diseases such as ataxia ... ...

    Abstract The recent advent of induced pluripotent stem cells (iPSCs) and gene therapy tools has raised the possibility of autologous cell therapy for rare genetic diseases. However, cellular reprogramming is inefficient in certain diseases such as ataxia telangiectasia, Fanconi anemia, LIG4 syndrome, and fibrodysplasia ossificans progressiva syndrome, owing to interference of the disease-related genes. To overcome these therapeutic limitations, it is necessary to fundamentally correct the abnormal gene during or prior to the reprogramming process. In addition, as genetic etiology of Parkinson's disease, it has been well known that induced neural stem cells (iNSCs) were progressively depleted by LRRK2 gene mutation, LRRK2 (G2019S). Thus, to maintain the induced NSCs directly derived from PD patient cells harboring LRRK2 (G2019S), it would be ideal to simultaneously treat the LRRK2 (G2019S) fibroblast during the process of TD. Therefore, simultaneous reprogramming (or TD) and gene therapy would provide the solution for therapeutic limitation caused by vulnerability of reprogramming or TD, in addition to being suitable for general application to the generation of autologous cell-therapy products for patients with genetic defects, thereby obviating the need for the arduous processes currently required.
    Language English
    Publishing date 2016-12-15
    Publishing country United States
    Document type Review ; Journal Article
    ZDB-ID 2573856-2
    ISSN 1687-9678 ; 1687-966X
    ISSN (online) 1687-9678
    ISSN 1687-966X
    DOI 10.1155/2016/2725670
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

To top