scholarly journals Methyltransferase-like protein 7A (METTL7A) promotes cell survival and osteogenic differentiation under metabolic stress

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Eugene Lee ◽  
Ju-young Kim ◽  
Tae-Kyung Kim ◽  
Seo-Young Park ◽  
Gun-Il Im
Keyword(s):  
Stem Cells ◽  
Stem Cell ◽  
Stem Cell Transplantation ◽  
Cell Survival ◽  
Osteogenic Differentiation ◽  
Cell Transplantation ◽  
Methylation Status ◽  
Bone Defects ◽  
Large Bone ◽  
Large Bone Defects

AbstractWhile bone has an inherent capacity to heal itself, it is very difficult to reconstitute large bone defects. Regenerative medicine, including stem cell implantation, has been studied as a novel solution to treat these conditions. However, when the local vascularity is impaired, even the transplanted cells undergo rapid necrosis before differentiating into osteoblasts and regenerating bone. Thus, to increase the effectiveness of stem cell transplantation, it is quintessential to improve the viability of the implanted stem cells. In this study, given that the regulation of glucose may hold the key to stem cell survival and osteogenic differentiation, we investigated the molecules that can replace the effect of glucose under ischemic microenvironment of stem cell transplantation in large bone defects. By analyzing differentially expressed genes under glucose-supplemented and glucose-free conditions, we explored markers such as methyltransferase-like protein 7A (METTL7A) that are potentially related to cell survival and osteogenic differentiation. Overexpression of METTL7A gene enhanced the osteogenic differentiation and viability of human bone marrow stem cells (hBMSCs) in glucose-free conditions. When the in vivo effectiveness of METTL7A-transfected cells in bone regeneration was explored in a rat model of critical-size segmental long-bone defect, METTL7A-transfected hBMSCs showed significantly better regenerative potential than the control vector-transfected hBMSCs. DNA methylation profiles showed a large difference in methylation status of genes related to osteogenesis and cell survival between hBMSCs cultured in glucose-supplemented condition and those cultured in glucose-free condition. Interestingly, METTL7A overexpression altered the methylation status of related genes to favor osteogenic differentiation and cell survival. In conclusion, it is suggested that a novel factor METTL7A enhances osteogenic differentiation and viability of hBMSCs by regulating the methylation status of genes related to osteogenesis or survival.

scholarly journals Precise Regulation of miR-210 is Critical for the Cellular Homeostasis Maintenance and Transplantation Efficacy Enhancement of Mesenchymal Stem Cells in Acute Liver Failure Therapy

2017 ◽  
Vol 26 (5) ◽  
pp. 805-820 ◽  
Author(s):  
Yingxia Liu ◽  
Yongjia Xiong ◽  
Feiyue Xing ◽  
Hao Gao ◽  
Xiaogang Wang ◽  
...  
Keyword(s):  
Stem Cells ◽  
Mesenchymal Stem Cells ◽  
Stem Cell ◽  
Stem Cell Transplantation ◽  
Liver Failure ◽  
Acute Liver Failure ◽  
Cell Survival ◽  
Cell Transplantation ◽  
Survival Ratio ◽  
Ros Production

Stem cell transplantation is a promising clinical strategy to cure acute liver failure. However, a low cell survival ratio after transplantation significantly impairs its therapeutic efficacy. This is partly due to insufficient resistance of transplanted stem cells to severe oxidative and inflammatory stress at the injury sites. In the current study, we demonstrated that a small molecule zeaxanthin dipalmitate (ZD) could enhance the defensive abilities against adverse stresses of human adipose-derived mesenchymal stem cells (hADMSCs) in vitro and increase their therapeutic outcomes of acute liver failure after transplantation in vivo. Treatment with ZD dramatically improved cell survival and suppressed apoptosis, inflammation, and reactive oxygen species (ROS) production of hADMSCs through the PKC/Raf-1/MAPK/NF-κB pathway to maintain a reasonably high expression level of microRNA-210 (miR-210). The regulation loop between miR-210 and cellular/mitochondrial ROS production was found to be linked by the ROS inhibitor iron–sulfur cluster assembly proteins (ISCU). Pretreatment with ZD and stable knockdown of miR-210 significantly improved and impaired the stem cell transplantation efficacy through the alteration of hepatic cell expansion and injury amelioration, respectively. Vehicle treatment with ZD did not pose any adverse effect on cell homeostasis or healthy animal. In conclusion, elevating endogenous antioxidant level of hADMSCs with ZD significantly enhances their hepatic tissue-repairing capabilities. Maintenance of a physiological level of miR-210 is critical for hADMSC homeostasis.

Stem Cell Transplantation: A Promising Therapy for Spinal Cord Injury

2020 ◽  
Vol 15 (4) ◽  
pp. 321-331 ◽  
Author(s):  
Zhe Gong ◽  
Kaishun Xia ◽  
Ankai Xu ◽  
Chao Yu ◽  
Chenggui Wang ◽  
...  
Keyword(s):  
Spinal Cord ◽  
Stem Cells ◽  
Spinal Cord Injury ◽  
Stem Cell ◽  
Stem Cell Transplantation ◽  
Cell Transplantation ◽  
Therapeutic Potential ◽  
Embryonic Stem ◽  
Current Status ◽  
Cord Injury

Spinal Cord Injury (SCI) causes irreversible functional loss of the affected population. The incidence of SCI keeps increasing, resulting in huge burden on the society. The pathogenesis of SCI involves neuron death and exotic reaction, which could impede neuron regeneration. In clinic, the limited regenerative capacity of endogenous cells after SCI is a major problem. Recent studies have demonstrated that a variety of stem cells such as induced Pluripotent Stem Cells (iPSCs), Embryonic Stem Cells (ESCs), Mesenchymal Stem Cells (MSCs) and Neural Progenitor Cells (NPCs) /Neural Stem Cells (NSCs) have therapeutic potential for SCI. However, the efficacy and safety of these stem cellbased therapy for SCI remain controversial. In this review, we introduce the pathogenesis of SCI, summarize the current status of the application of these stem cells in SCI repair, and discuss possible mechanisms responsible for functional recovery of SCI after stem cell transplantation. Finally, we highlight several areas for further exploitation of stem cells as a promising regenerative therapy of SCI.

scholarly journals The Transplantation Resistance of Type II Diabetes Mellitus Adipose-Derived Stem Cells Is Due to G6PC and IGF1 Genes Related to the FoxO Signaling Pathway

2021 ◽  
Vol 22 (12) ◽  
pp. 6595
Author(s):  
Michiko Horiguchi ◽  
Yuya Turudome ◽  
Kentaro Ushijima
Keyword(s):  
Diabetes Mellitus ◽  
Stem Cells ◽  
Stem Cell ◽  
Stem Cell Transplantation ◽  
Signaling Pathway ◽  
Cell Transplantation ◽  
Type Ii ◽  
Lower Performance ◽  
Foxo Signaling Pathway ◽  
Healthy Persons

In cases of patients with rapidly progressive diabetes mellitus (DM), autologous stem cell transplantation is considered as one of the regenerative treatments. However, whether the effects of autonomous stem cell transplantation on DM patients are equivalent to transplantation of stem cells derived from healthy persons is unclear. This study revealed that adipose-derived mesenchymal stem cells (ADSC) derived from type II DM patients had lower transplantation efficiency, proliferation potency, and stemness than those derived from healthy persons, leading to a tendency to induce apoptotic cell death. To address this issue, we conducted a cyclopedic mRNA analysis using a next-generation sequencer and identified G6PC3 and IGF1, genes related to the FoxO signaling pathway, as the genes responsible for lower performance. Moreover, it was demonstrated that the lower transplantation efficiency of ADSCs derived from type II DM patients might be improved by knocking down both G6PC3 and IGF1 genes. This study clarified the difference in transplantation efficiency between ADSCs derived from type II DM patients and those derived from healthy persons and the genes responsible for the lower performance of the former. These results can provide a new strategy for stabilizing the quality of stem cells and improving the therapeutic effects of regenerative treatments on autonomous stem cell transplantation in patients with DM.

scholarly journals A Cell-Based Approach to Dental Pulp Regeneration Using Mesenchymal Stem Cells: A Scoping Review

2021 ◽  
Vol 22 (9) ◽  
pp. 4357
Author(s):  
Sahng G. Kim
Keyword(s):  
Stem Cells ◽  
Stem Cell ◽  
Stem Cell Transplantation ◽  
Cell Transplantation ◽  
Scoping Review ◽  
Clinical Studies ◽  
Dental Pulp ◽  
Animal Studies ◽  
Risk Of Bias ◽  
Pulp Regeneration

Despite the recent explosion of investigations on dental pulp regeneration using various tissue engineering strategies, the translation of the findings from such studies into therapeutic applications has not been properly achieved. The purpose of this scoping review was to systematically review the efficacy of mesenchymal stem cell transplantation for dental pulp regeneration. A literature search was conducted using five electronic databases from their inception to January 2021 and supplemented by hand searches. A total of 17 studies, including two clinical trials and 15 animal studies using orthotopic pulp regeneration models, were included for the review. The risk of bias for the individual studies was assessed. This scoping review demonstrated that the regeneration of vascularized pulp-like tissue was achieved using the stem cell transplantation strategy in animal models. Autologous cell transplantation in two clinical studies also successfully regenerated vascularized vital tissue. Dental pulp stem cell subpopulations, such as mobilized dental pulp stem cells, injectable scaffolds such as atelocollagen, and a granulocyte-colony forming factor, were the most commonly used for pulp regeneration. The overall risk of bias was unclear for animal studies and was moderate or judged to raise some concerns for clinical studies. More high-quality clinical studies are needed to further determine the safety and efficacy of the stem cell transplantation strategy for dental pulp regeneration.

scholarly journals The Evolution of Intracardiac Hemodynamics Post Autologous Stem Cell Transplant in a Case of Multiple Myeloma Associated with Severe Tricuspid and Mitral Valve Insufficiency

2017 ◽  
Vol 2 (s4) ◽  
pp. 45-47
Author(s):  
Cezara-Iuliana Tudor ◽  
Erzsébet Lázár ◽  
Marius-Vasile Găzdac ◽  
Annamária Pakucs ◽  
Eszter Mild ◽  
...  
Keyword(s):  
Stem Cells ◽  
Multiple Myeloma ◽  
Stem Cell ◽  
Stem Cell Transplantation ◽  
Cell Transplantation ◽  
Autologous Stem Cell Transplantation ◽  
Heart Function ◽  
Cell Transplant ◽  
Severe Condition ◽  
Hematopoietic Stem

AbstractStem cells are undifferentiated cells that can divide and become differentiated. Hematopoietic stem cells cannot transform into new stem cells such as cardiomyocytes or new heart valves, but they act through paracrine effects, by secreting cytokines and growth factors that lead to an increase in contractility and overall improved function. In this case report, we present how autologous stem cell transplantation can bring two major benefits: the first refers to hematological malignancy and the second is about the improvement of the heart condition. We present the case of a 60-year-old patient diagnosed with multiple myeloma suffering from a bi-valve severe condition in which autologous stem cell transplantation led to the remission of the patient’s malignant disease and also improved the heart function.

Sign in / Sign up

Export Citation Format

Share Document