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  1. Article ; Online: Umbilical Cord Mesenchymal Stromal/Stem Cells and Their Interplay with Th-17 Cell Response Pathway.

    Najar, Mehdi / Rahmani, Saida / Faour, Wissam H / Alsabri, Sami G / Lombard, Catherine A / Fayyad-Kazan, Hussein / Sokal, Etienne M / Merimi, Makram / Fahmi, Hassan

    Cells

    2024  Volume 13, Issue 2

    Abstract: As a form of immunomodulatory therapeutics, mesenchymal stromal/stem cells (MSCs) from umbilical cord (UC) tissue were assessed for their dynamic interplay with the Th-17 immune response pathway. UC-MSCs were able to modulate lymphocyte response by ... ...

    Abstract As a form of immunomodulatory therapeutics, mesenchymal stromal/stem cells (MSCs) from umbilical cord (UC) tissue were assessed for their dynamic interplay with the Th-17 immune response pathway. UC-MSCs were able to modulate lymphocyte response by promoting a Th-17-like profile. Such modulation depended on the cell ratio of the cocultures as well as the presence of an inflammatory setting underlying their plasticity. UC-MSCs significantly increased the expression of IL-17A and RORγt but differentially modulated T cell expression of IL-23R. In parallel, the secretion profile of the fifteen factors (IL1β, IL-4, IL-6, IL-10, IL-17A, IL-17F, IL-22, IL-21, IL-23, IL-25, IL-31, IL-33, INF-γ, sCD40, and TNF-α) involved in the Th-17 immune response pathway was substantially altered during these cocultures. The modulation of these factors demonstrates the capacity of UC-MSCs to sense and actively respond to tissue challenges. Protein network and functional enrichment analysis indicated that several biological processes, molecular functions, and cellular components linked to distinct Th-17 signaling interactions are involved in several trophic, inflammatory, and immune network responses. These immunological changes and interactions with the Th-17 pathway are likely critical to tissue healing and may help to identify molecular targets that will improve therapeutic strategies involving UC-MSCs.
    MeSH term(s) Interleukin-17 ; Th17 Cells ; Mesenchymal Stem Cells ; Coculture Techniques ; Immunomodulation
    Chemical Substances Interleukin-17
    Language English
    Publishing date 2024-01-16
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2661518-6
    ISSN 2073-4409 ; 2073-4409
    ISSN (online) 2073-4409
    ISSN 2073-4409
    DOI 10.3390/cells13020169
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Role of epigenetics and the transcription factor Sp1 in the expression of the D prostanoid receptor 1 in human cartilage.

    Najar, Mehdi / Alsabri, Sami G / Guedi, Gadid G / Merimi, Makram / Lavoie, Frédéric / Grabs, Detlev / Pelletier, Jean-Pierre / Martel-Pelletier, Johanne / Benderdour, Mohamed / Fahmi, Hassan

    Frontiers in cell and developmental biology

    2023  Volume 11, Page(s) 1256998

    Abstract: D prostanoid receptor 1 (DP1), a prostaglandin D2 receptor, plays a central role in the modulation of inflammation and cartilage metabolism. We have previously shown that activation of DP1 signaling downregulated catabolic responses in cultured ... ...

    Abstract D prostanoid receptor 1 (DP1), a prostaglandin D2 receptor, plays a central role in the modulation of inflammation and cartilage metabolism. We have previously shown that activation of DP1 signaling downregulated catabolic responses in cultured chondrocytes and was protective in mouse osteoarthritis (OA). However, the mechanisms underlying its transcriptional regulation in cartilage remained poorly understood. In the present study, we aimed to characterize the human DP1 promoter and the role of DNA methylation in DP1 expression in chondrocytes. In addition, we analyzed the expression level and methylation status of the DP1 gene promoter in normal and OA cartilage. Deletion and site-directed mutagenesis analyses identified a minimal promoter region (-250/-120) containing three binding sites for specificity protein 1 (Sp1). Binding of Sp1 to the DP1 promoter was confirmed using electrophoretic mobility shift assay (EMSA) and chromatin immunoprecipitation (ChIP) assays
    Language English
    Publishing date 2023-11-30
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2737824-X
    ISSN 2296-634X
    ISSN 2296-634X
    DOI 10.3389/fcell.2023.1256998
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Epigenetic regulation of 15-lipoxygenase-1 expression in human chondrocytes by promoter methylation.

    Alsabri, Sami G / Guedi, Gadid G / Najar, Mehdi / Merimi, Makram / Lavoie, Frédéric / Grabs, Detlev / Fernandes, Julio / Pelletier, Jean-Pierre / Martel-Pelletier, Johanne / Benderdour, Mohamed / Fahmi, Hassan

    Inflammation research : official journal of the European Histamine Research Society ... [et al.

    2023  Volume 72, Issue 12, Page(s) 2145–2153

    Abstract: Objective and design: 15-Lipoxygenase-1 (15-LOX-1) catalyzes the biosynthesis of many anti-inflammatory and immunomodulatory lipid mediators and was reported to have protective properties in several inflammatory conditions, including osteoarthritis (OA). ...

    Abstract Objective and design: 15-Lipoxygenase-1 (15-LOX-1) catalyzes the biosynthesis of many anti-inflammatory and immunomodulatory lipid mediators and was reported to have protective properties in several inflammatory conditions, including osteoarthritis (OA). This study was designed to evaluate the expression of 15-LOX-1 in cartilage from normal donors and patients with OA, and to determine whether it is regulated by DNA methylation.
    Methods: Cartilage samples were obtained at autopsy from normal knee joints and from OA-affected joints at the time of total knee joint replacement surgery. The expression of 15-LOX-1 was evaluated using real-time polymerase chain reaction (PCR). The role of DNA methylation in 15-LOX-1 expression was assessed using the DNA methyltransferase inhibitor 5-Aza-2'-desoxycytidine (5-Aza-dC). The effect of CpG methylation on 15-LOX-1 promoter activity was evaluated using a CpG-free luciferase vector. The DNA methylation status of the 15-LOX-1 promoter was determined by pyrosequencing.
    Results: Expression of 15-LOX-1 was upregulated in OA compared to normal cartilage. Treatment with 5-Aza-dC increased 15-LOX-1 mRNA levels in chondrocytes, and in vitro methylation decreased 15-LOX-1 promoter activity. There was no difference in the methylation status of the 15-LOX-1 gene promoter between normal and OA cartilage.
    Conclusion: The expression level of 15-LOX-1 was elevated in OA cartilage, which may be part of a repair process. The upregulation of 15-LOX-1 in OA cartilage was not associated with the methylation status of its promoter, suggesting that other mechanisms are involved in its upregulation.
    MeSH term(s) Humans ; Arachidonate 15-Lipoxygenase/genetics ; Arachidonate 15-Lipoxygenase/metabolism ; Chondrocytes/metabolism ; DNA Methylation ; Epigenesis, Genetic ; Osteoarthritis/genetics ; Osteoarthritis/metabolism ; Scavenger Receptors, Class E/genetics ; Scavenger Receptors, Class E/metabolism
    Chemical Substances Arachidonate 15-Lipoxygenase (EC 1.13.11.33) ; Scavenger Receptors, Class E ; ALOX15 protein, human (EC 1.13.11.33)
    Language English
    Publishing date 2023-10-24
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 1221794-3
    ISSN 1420-908X ; 1023-3830
    ISSN (online) 1420-908X
    ISSN 1023-3830
    DOI 10.1007/s00011-023-01805-0
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Novel Insights on Understanding of Keloid Scar: Article Review.

    Mari, Walid / Alsabri, Sami G / Tabal, Najib / Younes, Sara / Sherif, Abdulamagid / Simman, Richard

    The journal of the American College of Clinical Wound Specialists

    2016  Volume 7, Issue 1-3, Page(s) 1–7

    Abstract: Keloid scar, dermal benign fibro-proliferative growth that extends outside the original wound and invades adjacent dermal tissue due to extensive production of extracellular matrix, especially collagen, which caused by over expression of cytokines and ... ...

    Abstract Keloid scar, dermal benign fibro-proliferative growth that extends outside the original wound and invades adjacent dermal tissue due to extensive production of extracellular matrix, especially collagen, which caused by over expression of cytokines and growth factors. Although many attempts were made to understand the exact pathophysiology and the molecular abnormalities, the pathogenesis of keloid scar is yet to be determined. Even though there are several treatment options for keloid scars include combination of medical and surgical therapies like combination of surgical removal followed by cryotherapy or intralesional steroid therapy, the reoccurrence rate is still high despite the present treatment. In this review, PubMed, clinical key and Wright State Library web site have been used to investigate any update regarding Keloid disease. We used Keloid, scar formation, hypertrophic scar and collagen as key words. More than 40 articles have been reviewed. This paper reviews literature about keloid scar formation mechanism, the most recent therapeutic options including the ones under research.
    Language English
    Publishing date 2016-11-30
    Publishing country United States
    Document type Review ; Journal Article
    ISSN 2213-5103
    ISSN 2213-5103
    DOI 10.1016/j.jccw.2016.10.001
    Database MEDical Literature Analysis and Retrieval System OnLINE

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