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Comparison of HLA-G Levels for Cord Blood Derived-MSC and Wharton's Jelly Derived-MSC
(Walter de Gruyter GmbH, 2025) Abatay Sel, Figen; Erol Bozkurt, Ayse; Karatas, Sule; Suleymanoglu, Mediha; Yasa, Beril; Yasa, Cenk; Savran Oguz, Fatma; Oǧuz, Fatma Savran; Sel, Figen Abatay; Bozkurt, Ayşe Erol
Objectives: A special group of stem cells with multipotent and immunomodulatory properties are mesenchymal stem cells (MSCs). Many modulatory factors are thought to mediate immunomodulatory properties of MSCs. One of these modulatory factors is thought to be HLA-G, one of human leukocyte antigens (HLA). This study aimed to compare HLA-G levels in both stimulated and unstimulated of peripheral blood mononuclear cell (PBMC) cultures with "cord blood-MSC" (CB-MSC) and "Wharton's jelly-MSC" (WJ-MSC) at different rates and different incubation periods. Methods: WJ-MSCs were obtained by explant method, and CB-MSCs using Ficoll-paque. They were characterized by flow cytometry. MSCs and PBMCs were directly co-cultured for 24 and 72 h at 1:5 and 1:10, respectively. After incubations, the media were collected and HLA-G levels were measured by ELISA. Results: In the unstimulated group, the highest HLA-G level was found in the PBMC:WJ-MSC-72-1:5 group, while the lowest HLA-G level was found in the PBMC:CB-MSC-72-1:5. When 24-1:5 and 72-1:5 groups were examined, the HLA-G level decreased significantly in CB-MSC groups compared to WJ-MSC, while it increased significantly in the 24-1:10 and 72-1:10 groups (p<0.05). In stimulated groups, the highest HLA-G level was observed in the PBMC:CB-MSC-24-1:5. Conclusions: Our study aimed to evaluate the immunomodulatory effect of MSCs via HLA-G molecule. HLA-G levels changed with different incubation times of two different MSC sources. In this study, we suggest that MSCs as a cell therapy, in particular for immune system-related disease, may be a preliminary in vitro approach to evaluate the immunomodulatory effect via HLA-G.
Cell-Based Therapy for Cancer in Regenerative Medicine
(CRC Press, 2025) Sel, Figen Abatay; Oǧuz, Fatma Savran
Regenerative medicine focuses on developing and applying new cell-based therapies to heal tissues and organs and restore function lost due to aging, disease, tissue damage, or cancer. Cancer is a complex disease. It can occur with dysfunction in multiple systems, including DNA repair and apoptotic and immune functions. One form of regenerative medicine is cancer immunotherapy. In cancer immunotherapy, the immune system is activated, replaced, engineered, or regenerated to fight cancer. Stem cells are the most widely used for cancer immunotherapy. Stem cells have a natural capacity for self-healing via asymmetric division. Mesenchymal stem cells (MSCs) are a specific group of stem cells that have the potential to be used most often in regenerative medicine. In addition to MSCs, induced pluripotent stem cells (iPSCs) and hematopoietic stem cells (HSCs) are used in regenerative medicine for cancer treatment. This chapter will discuss using different types of stem cells in other cancers and the pros and cons of using stem cell-based therapies. © 2025 Elsevier B.V., All rights reserved.

Abatay Sel, Figen

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