جستجوی مقالات مرتبط با کلیدواژه « Mesenchymal Stem Cell » در نشریات گروه « زیست شناسی »

Bone is the hardest and one of the most important tissues in the body. In case of bone damage, the current treatments do not completely repair and regenerate the bone. For this reason, cell-based tissue engineering strategies, especially Mesenchymal Stem Cells (MSCs), have received attention. MSCs have the ability to self-renew and differentiate into different cell types, including bone cells, cartilage cells, and fat cells, among others. They are found in various tissues throughout the body, including bone marrow, adipose tissue, and umbilical cord tissue. Today, MSCs are a valuable resource for regenerative medicine and tissue engineering applications. In addition to the cells, scaffolds are another essential element of tissue engineering. One of these scaffolds is decellularized tissue-derived hydrogels, which are three-dimensional network of hydrophilic polymer chains that can absorb and retain a significant amount of water. In tissue engineering, they mimic the natural extracellular matrix of tissues, providing a suitable environment for cells to attach, proliferate, and differentiate. In the current study, we aimed to investigate the effects of decellularized skeletal muscle-derived hydrogel, known as Myogel, on bone marrow-derived MSCs biological behaviors, including proliferation, viability and migration. In this study, MSCs were isolated from tibia and femur of adult Wistar rats. MSCs were cultured in a complete medium (a-MEM containing 15% fetal bovine serum (FBS) and 1% penicillin/streptomycin (Pen/Strep)). The identity of cells was determined by morphology (using inverted microscope) and expression of specific CD markers (using Flowcytometry). Skeletal muscle was decellularized and accuracy of decellularization was evaluated using special staining. Then Myogel was prepared from digested decellularized skeletal muscle. Here, Myogel substrate was used as the control group, gelatin substrate as the positive control, and un-coated plates as the negative control. The effect of Myogel on survival (MTT method), proliferation (drawing the growth curve and calculating the doubling time of the cell population), cell cycle profile (flow cytometry method), and cell migration (scratch method) were investigated. The MTT test showed that the survival of MSCs in Myogel substrate with a concentration of 0.2 mg/ml was higher than the survival of MSCs in gelatin substrate with a concentration of 0.1 mg/ml and the survival of MSCs in gelatin was higher than the survival of control MSCs. Myogel substrate increased the proliferation and migration of cells and decreased the doubling time of MSCs population. Examining the cell cycle profile showed that a high percentage of cells cultured on Myogel were in the G1 and S phase of the cell cycle, indicating an increase in cell division speed by gelatin and, in the next degree, by Myogel. Therefore, Myogel can be used as a suitable substrate to increase the proliferative and migratory potential of MSCs, which are an important factor in tissue engineering.

Using 3D culture to increase cell density and creating a suitable bedrock for the growth and proliferation and differentiation of stem cells is one of the important methods for their application in tissue engineering. In this study, mesenchymal stem cells of adipose tissue because of ease of access and abundance have been used to differentiate into hepatocyte-like cells to investigate the effect of 3D cultures on gelatin/laminin 3D scaffolds.

Mesenchymal stem cells were extracted from subcutaneous fat of the abdominal region of C57 mice by enzymatic digestion using collagenase enzyme. The extracted stem cells were confirmed by flow cytometry analysis and observation of the expression of specific stem cells markers such as CD105, CD44, and the absence of specific leukocyte (CD34) and hematopoietic (CD45). The non-toxicity of the scaffold was also investigated by the MTT method. Stem cells were cultured on a polystyrene surface and laminin and gelatin/laminin scaffold and treated with growth factors for 21 days in two stages. Cell differentiation was investigated by biochemical methods including examination of secretion indices such as urea and glycogen storage.

The expression of specific stem cells markers such as CD105, CD44, and the absence of CD34 and CD45 were proved. The ability to differentiate these cells into adipocytes and osteocytes has been proven.

The results show the presence of a three-dimensional gelatin/laminin scaffold increases the adhesion, proliferation, and differentiation of fatty mesenchymal cells to hepatocyte-like cells.

Mesenchymal stem cells (MSCs) are multipotent stem cells that have potential to differentiate into connective tissue lineages. They also have special properties such as immunomodulation and secretion of growth factors. Histone methyltransferase G9a is one of the factors that control stem cells behaviors and features. Hence, it is important to study the role of G9a in MSCs biological behaviors and potentials. MSCs were isolated from rat bone marrow and cultured in vitro. Then, the expression of positive markers (CD90 and CD 73) and negative markers (CD45) were analyzed using flowcytometry. BM-MSCs were treated with different doses of A366, and then were differentiated to osteocyte. Osteogenesis were analyzed using oil red staining and real time-PCR.  BM-MSCs were expanded as adherent cells with fibroblastic morphology. More than 85% of cells were positive for CD73 and CD90, and negative for CD45. The treatment of BM-MSCs with A366 reduced osteogenesis as evaluated by oil red staining and gene expression analysis. A366, as an epigenetic regulator decreases the osteogenic potential of BM-MSCs. Use of these regulators for cancer therapy, might influence tissue regeneration and homeostasis.

Allstem cells are originated from both embryonic stem cells and adult stem cells. The most important adult stemcellsaremesenchymal stem cells. Mesenchymal stem cellsare pluripotentandnon-hematopoietic cellswithahighdifferentiation potential.There arein thebone marrowand otherskeletal tissues.Mesenchymalstem cellsderivedfrombone marroware capabledifferentiationto osteoblast, osteocyte,adipocyte, chondrocyte, tendonsand muscle cells underin vivoandin vitro.In vitro osteoblastic differentiation needs to a variety of factors, which creates condition similar to bone tissue microenvironment. In this study, the effects of embryonic cartilaginous tissue extract was studied to differentiation of bone marrow mesenchymal stem cell into osteoblast. Mesenchymal stem cells were isolated from mice bone marrow and cultured in flasks containing DMEM-F12, 100 μg/ml streptomycin, 100 U/ml penicillin and 10% FBS.Mesenchymal stem cellswerepurifiedbyseveral passages, then cellswere affectedby 15day mouse cartilaginous tissue extraction. After21 days ofculture, Alizarin Red staining was usedfor the detection ofosteoblasticcells.Aftereffect of extraction, spindle-shaped mesenchymal stem cellschange theirshapeAndmany appendages was observedincells. Alizarin Red staining has shown osteoblasticdifferentiation ofmesenchymal stem cells.Also osteoblastic differentiation of mesenchymal stem cells has confirmed morphogenic and osteogenic factors at cartilaginous tissue extracts of 15-day mouse embryo. Theresults express of osteoblastic differentiation of mesenchymal stem cells.Therefore, it is used in vitro models of osteoblast differentiation and genetic diseases of bone.