Differentiation Potential Of Stem Cells Research Articles

Selenium-doped carbon dots inhibit ferroptosis by multi-hierarchy iron chelation and mitochondrial homeostasis regulation to control inflammation

Ferroptosis has been identified as a prevalent pathological process in both infectious and non-infectious inflammation. Multiregional iron accumulation within extracellular, cytoplasmic, and subcellular compartments, particularly into mitochondria, can trigger lipid peroxidation and subsequent ferroptosis. Meanwhile, mitochondrial dysfunction, as a hallmark feature of ferroptosis, also exacerbates ferroptosis and inflammation. Here, a strategy of multi-hierarchy iron chelation coupled with mitochondrial homeostasis regulation is proposed to inhibit ferroptosis and relieve inflammation based on selenium-doped carbon dots (SeCDs). SeCDs with reactive oxygen species (ROS) scavenging capacity can be efficiently internalized into cells and enriched in mitochondria. Through the multi-hierarchy chelation for extracellular, cytoplasmic, and mitochondrial iron, iron overload is remarkably inhibited. Meanwhile, promoting glutathione peroxidase 4 (GPX4) expression and activating the AMPK pathway can restrain the metabolism of glycerophospholipids and polyunsaturated fatty acids and lipid peroxidation. Importantly, SeCDs restore mitochondrial homeostasis by chelating mitochondrial iron, scavenging mtROS, and increasing the level of GPX4, thereby enhancing ferroptosis suppression. Further, SeCDs rescue the osteogenic differentiation potential of stem cells, which is generally weakened by ferroptosis. In vivo experiments prove that SeCDs can significantly inhibit ferroptosis and inflammation, and facilitate tissue regeneration. Thus, this multifunctional nanosystem provides a promising therapeutic strategy to inhibit ferroptosis and ease inflammation.

Tri-Lineage Differentiation Potential of Stem Cells from Human Exfoliated Deciduous Teeth - An In-Vitro Study

ABSTRACT Background: The use of SHED might bring advantages for tissue engineering over the use of stem cells from adult human teeth as SHEDs were reported to have higher proliferation rate and increase cell population doublings as compared with stem cells from permanent teeth. Objective: The study’s objective was to assess the growth kinetics and tri-lineage differentiation capacity of stem cells derived from human exfoliated deciduous teeth. Material and Method: After being propagated through multiple sequential subcultures, adherent fibroblastic cells in the pulp tissue culture from human exfoliation teeth were evaluated to assess their tripotent differentiation potential into bone, cartilage, and adipose cell lineages. Result: The stem cells derived from dental pulp had a comparatively high ability for proliferation and successfully differentiated into chondrocytes and osteocytes while less significant for adipocytes. Conclusion: Stem cells from Human Exfoliated Deciduous teeth are mesenchymal stem cells which are multipotent and can serve as a promising incentive for therapeutic and future research purposes.

Fructose vs. glucose: modulating stem cell growth and function through sugar supplementation.

In multicellular organisms, stem cells are impacted by microenvironmental resources such as nutrient availability and oxygen tension for their survival, growth, and differentiation. However, the accessibility of these resources in the pericellular environment greatly varies from organ to organ. This divergence in resource availability leads to variations in the potency and differentiation potential of stem cells. This study aimed to explore the distinct effects of glucose and fructose, as well as different oxygen tensions, on the growth dynamics, cytokine production, and differentiation of stem cells. We showed that replacing glucose with fructose subjected stem cells to stress, resulting in increased Hif1α expression and stability, which in turn led to a reduction in cell proliferation, and alterations in cytokine production. However, fructose failed to induce differentiation of human mesenchymal stem cells (hMSCs) as well as mouse fibroblasts into mature adipocytes compared to glucose, despite the upregulation of key markers of adipogenesis, including C/EBPβ, and PPARγ. Conversely, we showed that fructose induced undifferentiated mouse fibroblasts to release cytokines associated with senescence, including IL1α1, IL6, IL8, MCP1, and TNF1α, suggesting that these cells were undergoing lipolysis. Taken together, our results suggest that altering the culture conditions through changes in hexose levels and oxygen tension places considerable stress on stem cells. Additional research is required to further characterize the mechanisms governing stem cell response to their microenvironments.

A comprehensive stem cell laboratory module with blended learning for medical students at Tongji University.

The laboratory practice "Primary culture and directional differentiation of rat bone marrow mesenchymal stem cells (BMSCs)" is part of a required course for sophomore medical students at Tongji university, which has been conducted since 2012. Blended learning has been widely applied in medical courses. Based on a student-centered teaching philosophy, we reconstructed a comprehensive stem cell laboratory module with blended learning in 2021, aiming to facilitate students in enhancing their understanding of the multi-lineage differentiation potential of stem cells and improve their experimental skills, self-directed learning ability, and innovative thinking. First, we constructed in-depth online study resources, including videos demonstrating laboratory procedures, a PowerPoint slide deck, and published literature on student self-learning before class. In class, students performed a primary culture of BMSCs, freely chose among adipogenic, osteogenic, or chondrogenic differentiation, and used cytochemical or immunofluorescence staining for identification. After class, the extracurricular part involved performing quantitative polymerase chain reaction to examine the expression of multi-lineage differentiation marker genes, which was designed as an elective. After 2 years of practice, positive feedback was obtained from both students and faculty members who achieved, the learning goal as expected. The reconstructed stem cell laboratory module provides comprehensive practice opportunities for students. Students have a better understanding of BMSC at the molecular, cellular, and functional levels and have improved their experimental skills, which forms a basis for scientific research for medical students. Introducing blended learning into other medical laboratory practices thus seems valuable.

A double encryption protection algorithm for stem cell bank privacy data based on improved AES and chaotic encryption technology.

The unique infinite self-renewal ability and multidirectional differentiation potential of stem cells provide a strong support for the clinical treatment. In light of the growing demands for stem cell storage, how to ensure personal privacy security and comply with strict ethical supervision requirements is particularly important. In order to solve the problem of low security of traditional encryption algorithm, we proposed a double encryption protection (DEP) algorithm for stem cell bank privacy data based on improved AES and chaotic encryption technology. Firstly, we presented the hash value key decomposition algorithm, through the hash value dynamic coding, cyclic shift, conversion calculation to get the key of each subsystem in the built algorithm. Secondly, DEP algorithm for privacy data is realized with two level of encryption. The first level of encryption protection algorithm used AES as the main framework, adding dynamic coding and byte filling based on DNA coding, and carries out dynamic shift of rows and simplified mixing of columns. The second level of encryption protection algorithm conducted random encoding, operation, diffusion and decoding based on the results of our proposed sequence conversion algorithm. Finally, we raised two evaluation indexes, the number of characters change rate (NCCR) and the unified average change intensity of text (UACIT) to measure the sensitivity of encryption algorithms to changes in plain information. The experimental results of using DEP shown that the average values of histogram variance, information entropy, NCCR and UACIT are116.7883, 7.6688, 32.52% and 99.67%, respectively. DEP algorithm has a large key space, high key sensitivity, and enables dynamic encryption of private data in stem cell bank. The encryption scheme provided in this study ensures the security of the private information of stem cell bank in private cloud environment, and also provides a new method for the encryption of similar high confidentiality data.

Metabolic Glycoengineering: A Promising Strategy to Remodel Microenvironments for Regenerative Therapy.

Cell-based regenerative therapy utilizes the differentiation potential of stem cells to rejuvenate tissues. But the dynamic fate of stem cells is calling for precise control to optimize their therapeutic efficiency. Stem cell fate is regulated by specific conditions called "microenvironments." Among the various factors in the microenvironment, the cell-surface glycan acts as a mediator of cell-matrix and cell-cell interactions and manipulates the behavior of cells. Herein, metabolic glycoengineering (MGE) is an easy but powerful technology for remodeling the structure of glycan. By presenting unnatural glycans on the surface, MGE provides us an opportunity to reshape the microenvironment and evoke desired cellular responses. In this review, we firstly focused on the determining role of glycans on cellular activity; then, we introduced how MGE influences glycosylation and subsequently affects cell fate; at last, we outlined the application of MGE in regenerative therapy, especially in the musculoskeletal system, and the future direction of MGE is discussed.

TPPU inhibits inflammation-induced excessive autophagy to restore the osteogenic differentiation potential of stem cells and improves alveolar ridge preservation

Inflammation-induced autophagy is a double-edged sword. Dysfunction of autophagy impairs the differentiation capacity of mesenchymal stem cells and enhances inflammation-induced bone loss. Tooth extraction with periodontal and/or endodontic lesions exacerbates horizontal and vertical resorption of alveolar bone during the healing period. Alveolar socket preservation (ASP) procedure following tooth extraction has important clinical implications for future prosthodontic treatments. Studies have shown that epoxyeicosatrienoic acids (EETs) have significant anti-inflammatory effects and participate in autophagy. However, whether EETs can minimize alveolar bone resorption and contribute to ASP by regulating autophagy levels under inflammatory conditions remain elusive. Here, we figured out that LPS-induced inflammatory conditions increased the inflammatory cytokine and inhibited osteogenic differentiation of human dental pulp stem cells (hDPSCs), and led to excessive autophagy of hDPSCs. Moreover, we identified that increased EETs levels using TPPU, a soluble epoxide hydrolase inhibitor, reversed these negative outcomes. We further demonstrated the potential of TPPU to promote early healing of extraction sockets and ASP, and speculated that it was related to autophagy. Taken together, these results suggest that targeting inhibition of soluble epoxide hydrolase using TPPU plays a protective role in the differentiation and autophagy of mesenchymal stem cells and provides potential feasibility for applying TPPU for ASP, especially under inflammatory conditions.

Steering Stem Cell Fate within 3D Living Composite Tissues Using Stimuli-Responsive Cell-Adhesive Micromaterials.

Engineered living microtissues such as cellular spheroids and organoids have enormous potential for the study and regeneration of tissues and organs. Microtissues are typically engineered via self-assembly of adherent cells into cellular spheroids, which are characterized by little to no cell-material interactions. Consequently, 3D microtissue models currently lack structural biomechanical and biochemical control over their internal microenvironment resulting in suboptimal functional performance such as limited stem cell differentiation potential. Here, this work report on stimuli-responsive cell-adhesive micromaterials (SCMs) that can self-assemble with cells into 3D living composite microtissues through integrin binding, even under serum-free conditions. It is demonstrated that SCMs homogeneously distribute within engineered microtissues and act as biomechanically and biochemically tunable designer materials that can alter the composite tissue microenvironment on demand. Specifically, cell behavior is controlled based on the size, stiffness, number ratio, and biofunctionalization of SCMs in a temporal manner via orthogonal secondary crosslinking strategies. Photo-based mechanical tuning of SCMs reveals early onset stiffness-controlled lineage commitment of differentiating stem cell spheroids. In contrast to conventional encapsulation of stem cell spheroids within bulk hydrogel, incorporating cell-sized SCMs within stem cell spheroids uniquely provides biomechanical cues throughout the composite microtissues' volume, which is demonstrated to be essential for osteogenic differentiation.

Effects of Ocrelizumab on Dental Pulp Derived Mesenchymal Stem Cells

Multiple sclerosis (MS) is a chronic autoimmune central nervous system (CNS) disease characterized by inflammation, demyelination and axonal damage. The most important goal in MS treatment is to provide neuroregeneration. However, current treatments only work to slow the progression of MS. Ocrelizumab is a humanized anti-CD20 monoclonal antibody used in the treatment of MS. In this study, it was aimed to investigate the effects of Ocrelizumab on the proliferation and differentiation potential of dental pulp-derived stem cells (DP-SC). For this purpose, three different (1.5 µg/mL, 15 µg/mL and 150 µg/mL) doses of Ocrelizumab were added to the normal culture medium, and then proliferation analyzes at 24, 48 and 72 hours were performed with the WST-1 assay. Ocrelizumab treatment for 24 and 48 hours was observed to dose-dependently reduce the proliferation of stem cells. At 72 hours, the efficacy of the drug on proliferation was lost at low doses. Similarly, a dose-dependent decrease in the expression of stemness marker, Rex1, was detected. The expression of the adipogenic differentiation marker ADFP, osteogenic differentiation marker RUNX2, chondrogenic differentiation marker SOX9, and neurogenic differentiation marker TUBB3 were evaluated to determine the influence on the differentiation potential of stem cells under the drug effect. While RUNX2, SOX9 and TUBB3 expressions increased in a dose-dependent manner, there was a decrease in ADFP expression in parallel to the drug dose. According to the results of the study, ocrelizumab might have the potential to support the regenerative effects by supporting the differentiation of DP-SCs in osteogenic, chodrogenic and neurogenic.

Single-Cell RNA-Sequencing Reveals Epithelial Cell Signature of Multiple Subtypes in Chemically Induced Acute Lung Injury.

Alveolar epithelial cells (AECs) play a role in chemically induced acute lung injury (CALI). However, the mechanisms that induce alveolar epithelial type 2 cells (AEC2s) to proliferate, exit the cell cycle, and transdifferentiate into alveolar epithelial type 1 cells (AEC1s) are unclear. Here, we investigated the epithelial cell types and states in a phosgene-induced CALI rat model. Single-cell RNA-sequencing of bronchoalveolar lavage fluid (BALF) samples from phosgene-induced CALI rat models (Gas) and normal controls (NC) was performed. From the NC and Gas BALF samples, 37,245 and 29,853 high-quality cells were extracted, respectively. All cell types and states were identified and divided into 23 clusters; three cell types were identified: macrophages, epithelial cells, and macrophage proliferating cells. From NC and Gas samples, 1315 and 1756 epithelial cells were extracted, respectively, and divided into 11 clusters. The number of AEC1s decreased considerably following phosgene inhalation. A unique SOX9-positive AEC2 cell type that expanded considerably in the CALI state was identified. This progenitor cell type may develop into alveolar cells, indicating its stem cell differentiation potential. We present a single-cell genome-scale transcription map that can help uncover disease-associated cytologic signatures for understanding biological changes and regeneration of lung tissues during CALI.

Chondrogenic differentiation of mouse CD105+ stem/progenitor cells on amino-group-functionalized biosilica-hydrogel scaffolds

Mesenchymal stem/progenitor cells (MSPCs) are critical for tissue regeneration. Moreover, the CD105 antigen identifies early MSPCs with increased chondrogenic differentiation ability. We hypothesized that amine-(NH2)-functionalized biosilica incorporating hydrogel scaffolds, seeded with mCoSPCs105+ would contribute to creating tissue-engineered scaffolds, capable of de novo cartilage synthesis. Scaffolds were characterized by water uptake, lysozyme degradation, axial compression, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. Differentiation stimulus of scaffold functionalization was evaluated using Alcian blue staining. Cartilage-forming abilities of mCoSPCs105+ were evaluated using Quantitative reverse transcription polymerase chain reaction (qRT-PCR) and immunohistochemistry. Biosilica particle incorporation into scaffolds resulted in increased water uptake capacity and compression force withstanding abilities. Amine-(NH2)-group functionalization of biosilica led to significantly increased stem cell differentiation potential, by Alcian blue staining, in the first 3 weeks. Scaffold attachment and viable cell proliferation were observed for 6 weeks under chondrogenic differentiation. Downregulation of Runx2, an increase of Col10a1, Ihh, and maintenance of Sox9, was seen under these culture conditions. mCoSPCs105+ gene expression pattern was defined by the significant upregulation of Col1a1, Col2a1, Prg4, and Agc-1 over 6 weeks of incubation compared to the unsorted control. Immunostaining of cell-seeded scaffolds revealed significantly higher secretion of proteins relevant to cartilage extracellular matrix. The preselecting of CD105+ phenotype in MSPCs may enhance tissue regeneration of fibrocartilage and biosilica nanoparticles may be a beneficial additive in tissue engineering of scaffolds.

Nanomaterials and Stem Cell Differentiation Potential: An Overview of Biological Aspects and Biomedical Efficacy

Nanoparticles (NPs), due to their medical applications, are widely used. Accordingly, the use of mesenchymal stem cells is one of the most important alternatives in the tissue engineering field. NPs play effective roles in stem cells proliferation and differentiation. The combination of NPs and tissue regeneration by stem cells has created a new therapeutic approach towards humanity. Of note, the physicochemical properties of NPs determine their biological function. Interestingly, various mechanisms such as modulation of signaling pathways and generation of reactive oxygen species, are involved in NPs-induced cellular proliferation and differentiation. This review summarized the types of nanomaterials effective on stem cell differentiation, the physicochemical features, biomedical application of these materials and the relationship between nanomaterials and environment.

Osteo/odontogenic differentiation analysis of dental stem cells from tooth germ, apical papilla, and dental follicle

AbstractAimDifferent tissues of dental origin are used for isolation of stem cells that can be differentiated towards osteogenic or odontogenic lineages, including dental follicle and apical papilla. Using tooth germ as a whole without separating dental follicle and apical papilla for isolating stem cells is another approach that uses the reciprocal interactions between two cell types. Although dental follicle stem cells and stem cells form apical papilla are widely investigated for both osteogenic and odontogenic differentiation, use of tooth germ stem cells is very limited despite its potential. This study aimed to investigate and compare the osteo/odontogenic differentiation potential of stem cells from apical papilla, tooth germ, and dental follicle in vitro.MethodsDental stem cells isolated from porcine were assessed in terms of cell surface antigens, multilineage differentiation, and cell proliferation. Osteo/odontogenic response was assessed with alkaline phosphatase activity, calcium deposition, von Kossa staining, confocal microscopy, and the expression of osteo/odontogenic markers by real‐time PCR at Days 7, 14, and 21.ResultsAll cell types showed expression of mesenchymal stem cell markers and differentiated towards chondrogenic and osteogenic lineages, while adipogenic differentiation was weak. Stem cells from apical papilla responded to osteo/odontogenic differentiation faster than that of dental follicle and tooth germ stem cells, but all groups indicated formation of mineralization and expressed osteogenic gene markers.ConclusionAll three cell types displayed similar biological characteristics and are appropriate candidates for bone regeneration.

Stem Cell Therapies for Restorative Treatments of Central Nervous System Ischemia-Reperfusion Injury.

Ischemic damage to the central nervous system (CNS) is a catastrophic postoperative complication of aortic occlusion subsequent to cardiovascular surgery that can cause brain impairment and sometimes even paraplegia. Over recent years, numerous studies have investigated techniques for protecting and revascularizing the nervous system during intraoperative ischemia; however, owing to a lack of knowledge of the physiological distinctions between the brain and spinal cord, as well as the limited availability of testing techniques and treatments for ischemia-reperfusion injury, the cause of brain and spinal cord ischemia-reperfusion injury remains poorly understood, and no adequate response steps are currently available in the clinic. Given the limited ability of the CNS to repair itself, it is of great clinical value to make full use of the proliferative and differentiation potential of stem cells to repair nerves in degenerated and necrotic regions by stem cell transplantation or mobilization, thereby introducing a novel concept for the treatment of severe CNS ischemia-reperfusion injury. This review summarizes the most recent advances in stem cell therapy for ischemia-reperfusion injury in the brain and spinal cord, aiming to advance basic research and the clinical use of stem cell therapy as a promising treatment for this condition.

Emerging role of m6A modification in osteogenesis of stem cells.

The differentiation of stem cells into osteoblasts is a key link in the treatment of bone defects and other orthopedic diseases. N6-methyladenosine (m6A) modification, an important post-transcriptional modification, is a methylation that occurs at the N6 site of RNA adenylate. The modification plays a regulatory role in the growth and development of biological individuals, the directional differentiation of stem cells and the occurrence of diseases. It is involved in various processes of the fate decision of stem cells. And it regulates the development and constant renewal of bone and keeps bone homeostasis by controlling and maintaining the balance between osteogenesis and adipogenesis. Meanwhile, it also affects the progress of orthopedic-associated diseases such as degenerative osteoporosis and bone tumor. In this review, we mainly summarize the new findings of three key molecules including Writers, Erasers and Readers which regulate m6A modification, and the emerging role of m6A modification in determining the fate and directed differentiation potential of stem cells, especially highlight the regulatory mechanism of osteogenic differentiation, the balance between osteogenesis and adipogenesis and the occurrence and development of bone-related diseases. It may provide some important ideas about finding new strategies to recover from bone defect and degenerative bone disease.

Retraction of: Long-Term Maintenance of Undifferentiated Human Embryonic and Induced Pluripotent Stem Cells in Suspension (doi.org/10.1089/scd.2010.0517).

Stem Cells and DevelopmentAhead of Print Retraction NoticeOpen AccessRetraction of: Long-Term Maintenance of Undifferentiated Human Embryonic and Induced Pluripotent Stem Cells in Suspension (doi.org/10.1089/scd.2010.0517)Published Online:5 Oct 2021https://doi.org/10.1089/scd.2010.0517.retractAboutSectionsPDF/EPUB ToolsAdd to favoritesDownload CitationsTrack Citations Back To Publication ShareShare onFacebookTwitterLinked InRedditEmail Stem Cells and Development officially retracts the paper entitled, “Long-Term Maintenance of Undifferentiated Human Embryonic and Induced Pluripotent Stem Cells in Suspension,” by Mehran Rezaei Larijani, Ali Seifinejad, Behshad Pournasr, Vahid Hajihoseini, Seydeh-Nafiseh Hassani, Mehdi Totonchi, Maryam Yousefi, Farnaz Shamsi, Ghasem Hosseini Salekdeh, and Hossein Baharvand (Stem Cells Dev 2011; 20(11):1911-1923) due to concerns regarding replicated panels within Figure 3.The Editor-in-Chief of Stem Cells and Development invited the corresponding author, Dr. Hossein Baharvand, to respond to the issues raised. Dr. Baharvand's response was as follows: “The experiment related to Figure 3A has been performed more than 10 years ago in our laboratory and the paper has been published in 2011. Unfortunately, at this point, we could not retrieve the original gel images to investigate the source of this possible error. However, we stand by our statement regarding the maintained differentiation potential of these pluripotent stem cell lines under three-dimensional culture. Pluripotency was also separately confirmed with directed differentiation and expression of the markers in Figures 3B and 3C. Furthermore, the differentiation potential of these suspension-expanded human pluripotent stem cell lines has been shown in our other studies.1-7Importantly, our conclusions remain unchanged regarding human pluripotent stem cell differentiation potential into three-germ layer derivatives using the proposed method. Finally, the data in figure 3A has no bearing on the main conclusion of our manuscript, that is our approach maintained the capability of freeze/thawing, karyotype stability, transcriptome, and pluripotency of hESCs and hiPSCs when expanded in stirred bioreactors.The authors apologize to the community for the inconvenience this has caused and request that our article to be retracted to avoid any potential ambiguities in the future.”Based on this explanation, the Editor of Stem Cells and Development agrees that the article requires retraction.The Editor and Publisher of Stem Cells and Development are committed to preserving the scientific literature and the community it serves.

Radiation-Induced Osteocyte Senescence Alters Bone Marrow Mesenchymal Stem Cell Differentiation Potential via Paracrine Signaling.

Cellular senescence and its senescence-associated secretory phenotype (SASP) are widely regarded as promising therapeutic targets for aging-related diseases, such as osteoporosis. However, the expression pattern of cellular senescence and multiple SASP secretion remains unclear, thus leaving a large gap in the knowledge for a desirable intervention targeting cellular senescence. Therefore, there is a critical need to understand the molecular mechanism of SASP secretion in the bone microenvironment that can ameliorate aging-related degenerative pathologies including osteoporosis. In this study, osteocyte-like cells (MLO-Y4) were induced to cellular senescence by 2 Gy γ-rays; then, senescence phenotype changes and adverse effects of SASP on bone marrow mesenchymal stem cell (BMSC) differentiation potential were investigated. The results revealed that 2 Gy irradiation could hinder cell viability, shorten cell dendrites, and induce cellular senescence, as evidenced by the higher expression of senescence markers p16 and p21 and the elevated formation of senescence-associated heterochromatin foci (SAHF), which was accompanied by the enhanced secretion of SASP markers such as IL-1α, IL-6, MMP-3, IGFBP-6, resistin, and adiponectin. When 0.8 μM JAK1 inhibitors were added to block SASP secretion, the higher expression of SASP was blunted, but the inhibition in osteogenic and adipogenic differentiation potential of BMSCs co-cultured with irradiated MLO-Y4 cell conditioned medium (CM- 2 Gy) was alleviated. These results suggest that senescent osteocytes can perturb BMSCs’ differential potential via the paracrine signaling of SASP, which was also demonstrated by in vivo experiments. In conclusion, we identified the SASP factor partially responsible for the degenerative differentiation of BMSCs, which allowed us to hypothesize that senescent osteocytes and their SASPs may contribute to radiation-induced bone loss.

Injectable stress relaxation gelatin-based hydrogels with positive surface charge for adsorption of aggrecan and facile cartilage tissue regeneration

BackgroundCartilage injury and pathological degeneration are reported in millions of patients globally. Cartilages such as articular hyaline cartilage are characterized by poor self-regeneration ability due to lack of vascular tissue. Current treatment methods adopt foreign cartilage analogue implants or microfracture surgery to accelerate tissue repair and regeneration. These methods are invasive and are associated with the formation of fibrocartilage, which warrants further exploration of new cartilage repair materials. The present study aims to develop an injectable modified gelatin hydrogel.MethodThe hydrogel effectively adsorbed proteoglycans secreted by chondrocytes adjacent to the cartilage tissue in situ, and rapidly formed suitable chondrocyte survival microenvironment modified by ε-poly-L-lysine (EPL). Besides, dynamic covalent bonds were introduced between glucose and phenylboronic acids (PBA). These bonds formed reversible covalent interactions between the cis−diol groups on polyols and the ionic boronate state of PBA. PBA-modified hydrogel induced significant stress relaxation, which improved chondrocyte viability and cartilage differentiation of stem cells. Further, we explored the ability of these hydrogels to promote chondrocyte viability and cartilage differentiation of stem cells through chemical and mechanical modifications.ResultsIn vivo and in vitro results demonstrated that the hydrogels exhibited efficient biocompatibility. EPL and PBA modified GelMA hydrogel (Gel-EPL/B) showed stronger activity on chondrocytes compared to the GelMA control group. The Gel-EPL/B group induced the secretion of more extracellular matrix and improved the chondrogenic differentiation potential of stem cells. Finally, thus hydrogel promoted the tissue repair of cartilage defects.ConclusionModified hydrogel is effective in cartilage tissue repair.

Evaluation of Edaravone effects on the differentiation of human adipose derived stem cells into oligodendrocyte cells in multiple sclerosis disease in rats

AimsAmong all the treatments for Multiple Sclerosis, stem cell transplantation, such as ADSCs, has attracted a great deal of scientific attention. On the other hand, Edaravone, as an antioxidant component, in combination with stem cells, could increase the survival and differentiation potential of stem cells. Main methods42 rats were divided into: Control, Cuprizone (CPZ), Sham, Edaravone (Ed), hADSCs, and Ed/hADSCs groups. Following induction of cuprizone, induced MS model, behavioral tests were designed to evaluate motor function during. Luxal fast blue staining was done to measure the level of demyelination and remyelination. Immunofluorescent staining was used to evaluate the amount of MBP, OLIG2, and MOG proteins. The mRNA levels of human MBP, MOG, and OLIG2 and rat Mbp, Mog, and Olig2 were determined via RT-PCR. Key findingsFlow cytometry analysis exhibited that the extracted cells were positive for CD73 (93.8 ± 3%) and CD105 (91.6 ± 3%), yet negative for CD45 (2.06 ± 0.5%). Behavioral tests, unveiled a significant improvement in the Ed (P < 0.001), hADSCs (P < 0.001), and Ed/hADSCs (P < 0.001) groups compared to the others. In the Ed/hADSCs group, the myelin density was significantly higher than that in the Ed treated and hADSCs treated groups (P < 0.01). Edaravone and hADSCs increased the expression of Mbp, Mog, and Olig2 genes in the cuprizone rat models. Moreover, significant differences were seen between the Ed treated and hADSCs treated groups and the Ed/hADSCs group (P < 0.05 for Mbp and Olig2 and P < 0.01 for Mog). SignificanceEdaravone in combination with hADSCs reduced demyelination and increased oligodendrogenesis in the cuprizone rat models.

The Roles of MicroRNAs in Tendon Healing and Regeneration.

Tendons connect the muscle abdomen of skeletal muscles to the bone, which transmits the force generated by the muscle abdomen contraction and pulls the bone into motion. Tendon injury is a common clinical condition occurring in certain populations, such as repeated tendon strains in athletes. And it can lead to substantial pain and loss of motor function, in severe cases, significant disability. Tendon healing and regeneration have attracted growing interests. Some treatments including growth factors, stem cell therapies and rehabilitation programs have been tried to improve tendon healing. However, the basic cellular biology and pathology of tendons are still not fully understood, and the management of tendon injury remains a considerable challenge. Regulating gene expression at post-transcriptional level, microRNA (miRNA) has been increasingly recognized as essential regulators in the biological processes of tendon healing and regeneration. A wide range of miRNAs in tendon injury have been shown to play vital roles in maintaining and regulating its physiological function, as well as regulating the tenogenic differentiation potential of stem cells. In this review, we show the summary of the latest information on the role of miRNAs in tendon healing and regeneration, and also discuss potentials for miRNA-directed diagnosis and therapy in tendon injuries and tendinopathy, which may provide new theoretical foundation for tenogenesis and tendon healing.