scholarly journals Magnet-Bead Based MicroRNA Delivery System to Modify CD133+Stem Cells

2016 ◽  
Vol 2016 ◽  
pp. 1-16 ◽  
Author(s):  
Paula Müller ◽  
Natalia Voronina ◽  
Frauke Hausburg ◽  
Cornelia A. Lux ◽  
Frank Wiekhorst ◽  
...  
Keyword(s):  
Stem Cells ◽  
Stem Cell ◽  
Cell Engineering ◽  
Resonance Imaging ◽  
Beneficial Effects ◽  
Injured Tissue ◽  
Uptake Rates ◽  
Massive Cell Death ◽  
Microrna Delivery ◽  
Massive Cell

Aim. CD133+stem cells bear huge potential for regenerative medicine. However, low retention in the injured tissue and massive cell death reduce beneficial effects. In order to address these issues, we intended to develop a nonviral system for appropriate cell engineering.Materials and Methods. Modification of human CD133+stem cells with magnetic polyplexes carrying microRNA was studied in terms of efficiency, safety, and targeting potential.Results. High microRNA uptake rates (~80–90%) were achieved without affecting CD133+stem cell properties. Modified cells can be magnetically guided.Conclusion. We developed a safe and efficient protocol for CD133+stem cell modification. Our work may become a basis to improve stem cell therapeutical effects as well as their monitoring with magnetic resonance imaging.

Nano–Stem Cell Interactions: Applications Versus Implications

Nano LIFE ◽  
2018 ◽  
Vol 08 (04) ◽  
pp. 1841001
Author(s):  
Guotao Peng ◽  
Xiaoxiao Wang ◽  
Yuan He ◽  
Tianyu Yu ◽  
Sijie Lin
Keyword(s):  
Stem Cells ◽  
Cell Proliferation ◽  
Stem Cell ◽  
Stem Cell Research ◽  
Cell Interactions ◽  
Engineered Nanomaterials ◽  
Cell Engineering ◽  
Stem Cell Proliferation ◽  
Beneficial Effects ◽  
Stem Cell Engineering

Understanding nano–stem cell interactions plays a significant role in fostering both innovative and safe implementation of nanotechnology in stem cell research. Herein, we reviewed the recent advances of engineered nanomaterials and nanotechnologies in stem cell engineering and highlighted the key parameters that led to beneficial effects toward stem cell proliferation or differentiation. Meanwhile, we brought attention to the nanomaterials characteristics that contributed to toxic effects on stem cells with the hope to appeal balanced studies in the future by considering both the applications and implications of nanotechnologies.

scholarly journals “Empowering” Cardiac Cells via Stem Cell Derived Mitochondrial Transplantation- Does Age Matter?

2021 ◽  
Vol 22 (4) ◽  
pp. 1824
Author(s):  
Matthias Mietsch ◽  
Rabea Hinkel
Keyword(s):  
Stem Cells ◽  
Stem Cell ◽  
Treatment Strategies ◽  
Cardiac Cells ◽  
Aging Effects ◽  
Beneficial Effects ◽  
Micro Rnas ◽  
New Treatment

With cardiovascular diseases affecting millions of patients, new treatment strategies are urgently needed. The use of stem cell based approaches has been investigated during the last decades and promising effects have been achieved. However, the beneficial effect of stem cells has been found to being partly due to paracrine functions by alterations of their microenvironment and so an interesting field of research, the “stem- less” approaches has emerged over the last years using or altering the microenvironment, for example, via deletion of senescent cells, application of micro RNAs or by modifying the cellular energy metabolism via targeting mitochondria. Using autologous muscle-derived mitochondria for transplantations into the affected tissues has resulted in promising reports of improvements of cardiac functions in vitro and in vivo. However, since the targeted treatment group represents mainly elderly or otherwise sick patients, it is unclear whether and to what extent autologous mitochondria would exert their beneficial effects in these cases. Stem cells might represent better sources for mitochondria and could enhance the effect of mitochondrial transplantations. Therefore in this review we aim to provide an overview on aging effects of stem cells and mitochondria which might be important for mitochondrial transplantation and to give an overview on the current state in this field together with considerations worthwhile for further investigations.

scholarly journals Evaluation of the Possibility of Fixation of Autologous Mesenchymal Stem Cells in Liver Tissue Introduced into the Portal Vein of the Liver in a Patient Suffering from Cirrhosis

2021 ◽  
Vol 14 (2) ◽  
pp. 136-139
Author(s):  
Inna Evgenievna Kotkas ◽  
Shamil Magomedovich Asadulaev ◽  
Natella Iosifovna Enukashvili
Keyword(s):  
Magnetic Resonance Imaging ◽  
Stem Cells ◽  
Mesenchymal Stem Cells ◽  
Stem Cell ◽  
Magnetic Resonance ◽  
Portal Vein ◽  
Human Body ◽  
Resonance Imaging ◽  
Abdominal Organs ◽  
Autologous Mesenchymal Stem Cells

To date, there are quite a large number of reports of the use of stem cells in the treatment of various diseases in humans. However, the authors do not provide credible evidence that the introduced stem cells come directly into the target organ. Without a clear understanding of the location of the introduced stem cells, it is difficult to reliably assess the effect of their use. The article gives its own observation about the possibility of imaging in the human body autologous mesenchymal stem cells introduced through the portal vein of the liver to a patient suffering from cirrhosis. Iron oxide nanoparticles were used as labels. A rather simple question was previously solved: how to create a label of such size that the viability of the stem cell was preserved and it could be visualized in the human body when performing magnetic resonance imaging of abdominal organs. Following in vitro studies, the most appropriate stem cell marking embodiment was chosen to provide both adequate imaging and cell viability. After administration of marked table cells, magnetic resonance imaging of abdominal organs was performed to the patient. The introduced stem cells were visualised only in hepatic tissue. According to clinical and biochemical blood tests - no deviations were detected. There were no complications against the background of this procedure. The patient was discharged for outpatient treatment in satisfactory condition.

Role of stem-cell-derived microvesicles in the paracrine action of stem cells

2013 ◽  
Vol 41 (1) ◽  
pp. 283-287 ◽  
Author(s):  
Giovanni Camussi ◽  
Maria Chiara Deregibus ◽  
Vincenzo Cantaluppi
Keyword(s):  
Stem Cells ◽  
Stem Cell ◽  
Biological Activities ◽  
Biological Action ◽  
Experimental Models ◽  
Specific Information ◽  
Cell Of Origin ◽  
Bioactive Lipids ◽  
Beneficial Effects ◽  
Cell Based Therapy

The paracrine theory has recently changed the view of the biological action of stem cells and of the subsequent potential application of stem cells in regenerative medicine. Indeed, most of the beneficial effects of stem-cell-based therapy have been attributed to soluble factors released from stem cells. In this context, MVs (microvesicles) released as exosomes from the endosomal compartment, or as shedding vesicles from the cell surface, may play a relevant role in the intercellular communication between stem and injured cells. By transferring proteins, bioactive lipids, mRNA and microRNA, MVs act as vehicles of information that may lead to alteration of the phenotype of recipient cells. The exchange of information between stem cells and tissue-injured cells is reciprocal. The MV-mediated transfer of tissue-specific information from the injured cells to stem cells may reprogramme the latter to gain phenotypic and functional characteristics of the cell of origin. On the other hand, MVs released from stem cells may confer a stem-cell-like phenotype to injured cells, with the consequent activation of self-regenerative programmes. In fact, MVs released from stem cells retain several biological activities that are able to reproduce the beneficial effects of stem cells in a variety of experimental models.

Melatonin Pretreatment Improves the Survival and Function of Transplanted Mesenchymal Stem Cells after Focal Cerebral Ischemia

2014 ◽  
Vol 23 (10) ◽  
pp. 1279-1291 ◽  
Author(s):  
Yaohui Tang ◽  
Beibei Cai ◽  
Falei Yuan ◽  
Xiaosong He ◽  
Xiaojie Lin ◽  
...  
Keyword(s):  
Stem Cells ◽  
Stem Cell ◽  
Cerebral Ischemia ◽  
Focal Cerebral Ischemia ◽  
Brain Infarction ◽  
Protective Effects ◽  
Beneficial Effects ◽  
Erk Phosphorylation ◽  
And Function

Mesenchymal stem cell (MSC) transplantation has been shown to be beneficial in treating cerebral ischemia. However, such benefit is limited by the low survival of transplanted MSCs in an ischemic microenvironment. Previous studies showed that melatonin pretreatment can increase MSC survival in the ischemic kidney. However, whether it will improve MSC survival in cerebral ischemia is unknown. Our study examined the effect of melatonin pretreatment on MSCs under ischemia-related conditions in vitro and after transplantation into ischemic rat brain. Results showed that melatonin pretreatment greatly increased survival of MSCs in vitro and reduced their apoptosis after transplantation into ischemic brain. Melatonin-treated MSCs (MT-MSCs) further reduced brain infarction and improved neurobehavioral outcomes. Angiogenesis, neurogenesis, and the expression of vascular endothelial growth factor (VEGF) were greatly increased in the MT-MSC-treated rats. Melatonin treatment increased the level of p-ERK1/2 in MSCs, which can be blocked by the melatonin receptor antagonist luzindole. ERK phosphorylation inhibitor U0126 completely reversed the protective effects of melatonin, suggesting that melatonin improves MSC survival and function through activating the ERK1/2 signaling pathway. Thus, stem cells pretreated by melatonin may represent a feasible approach for improving the beneficial effects of stem cell therapy for cerebral ischemia.

scholarly journals Increased Understanding of Stem Cell Behavior in Neurodegenerative and Neuromuscular Disorders by Use of Noninvasive Cell Imaging

2016 ◽  
Vol 2016 ◽  
pp. 1-20 ◽  
Author(s):  
Bryan Holvoet ◽  
Liesbeth De Waele ◽  
Mattia Quattrocelli ◽  
Olivier Gheysens ◽  
Maurillio Sampaolesi ◽  
...  
Keyword(s):  
Stem Cells ◽  
Stem Cell ◽  
Cell Imaging ◽  
Neuromuscular Disorders ◽  
Major Change ◽  
Full Potential ◽  
Cell Type ◽  
Beneficial Effects ◽  
Cell Monitoring

Numerous neurodegenerative and neuromuscular disorders are associated with cell-specific depletion in the human body. This imbalance in tissue homeostasis is in healthy individuals repaired by the presence of endogenous stem cells that can replace the lost cell type. However, in most disorders, a genetic origin or limited presence or exhaustion of stem cells impairs correct cell replacement. During the last 30 years, methods to readily isolate and expand stem cells have been developed and this resulted in a major change in the regenerative medicine field as it generates sufficient amount of cells for human transplantation applications. Furthermore, stem cells have been shown to release cytokines with beneficial effects for several diseases. At present however, clinical stem cell transplantations studies are struggling to demonstrate clinical efficacy despite promising preclinical results. Therefore, to allow stem cell therapy to achieve its full potential, more insight in theirin vivobehavior has to be achieved. Different methods to noninvasively monitor these cells have been developed and are discussed. In some cases, stem cell monitoring even reached the clinical setting. We anticipate that by further exploring these imaging possibilities and unraveling theirin vivobehavior further improvement in stem cell transplantations will be achieved.

scholarly journals Cellular therapy promotes endogenous stem cell repair

2012 ◽  
Vol 90 (10) ◽  
pp. 1335-1344 ◽  
Author(s):  
Forum Kamdar ◽  
Mohammad Nurulqadr Jameel ◽  
Paul Score ◽  
Jianyi Zhang
Keyword(s):  
Stem Cells ◽  
Stem Cell ◽  
Cellular Therapy ◽  
Ventricular Remodeling ◽  
Left Ventricular Remodeling ◽  
Left Ventricular ◽  
Lv Function ◽  
Beneficial Effects ◽  
Cellular Transplantation

Cellular transplantation for cardiac repair has emerged as an exciting treatment option for patients with myocardial infarction (MI) and heart failure. Animal models of post-infarction left ventricular remodeling have demonstrated an improvement in left ventricular (LV) function, decrease in scar size, and amelioration of adverse cardiac remodeling after stem cell transplantation. These beneficial effects occur despite minimal engraftment and negligible differentiation of transplanted cells. Evidence of the heart capability to self-renew continues to mount; however, the extent to which this occurs is still unclear. Although there is a specific population of cardiac stem cells capable of differentiating into cardiomyocytes, they alone are not capable of fully regenerating tissue damaged by MI. Therefore, paracrine mechanisms may be responsible for activating endogenous stem cells to promote regeneration and prevent apoptosis. These structural beneficial effects may reduce regional wall stresses, consequently leading to long-term host myocardium gene/protein expression changes, which may subsequently result in improvement in LV function.

scholarly journals Effects of Antioxidant Supplements on the Survival and Differentiation of Stem Cells

2017 ◽  
Vol 2017 ◽  
pp. 1-16 ◽  
Author(s):  
Sara Shaban ◽  
Mostafa Wanees Ahmed El-Husseny ◽  
Abdelrahman Ibrahim Abushouk ◽  
Amr Muhammad Abdo Salem ◽  
Mediana Mamdouh ◽  
...  
Keyword(s):  
Stem Cells ◽  
Stem Cell ◽  
Culture Media ◽  
Stem Cell Differentiation ◽  
Beneficial Effects ◽  
The Past ◽  
Mitochondrial Dna Damage ◽  
Molecular Effects ◽  
Antioxidant Supplements ◽  
Different Doses

Although physiological levels of reactive oxygen species (ROS) are required to maintain the self-renewal capacity of stem cells, elevated ROS levels can induce chromosomal aberrations, mitochondrial DNA damage, and defective stem cell differentiation. Over the past decade, several studies have shown that antioxidants can not only mitigate oxidative stress and improve stem cell survival but also affect the potency and differentiation of these cells. Further beneficial effects of antioxidants include increasing genomic stability, improving the adhesion of stem cells to culture media, and enabling researchers to manipulate stem cell proliferation by using different doses of antioxidants. These findings can have several clinical implications, such as improving neurogenesis in patients with stroke and neurodegenerative diseases, as well as improving the regeneration of infarcted myocardial tissue and the banking of spermatogonial stem cells. This article reviews the cellular and molecular effects of antioxidant supplementation to cultured or transplanted stem cells and draws up recommendations for further research in this area.

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