فهرست مطالب سحر قصوری

Oligodendrocyte apoptosis is one of the principal mechanisms in progressive myelin destruction and the development of neurological disabilities. The oligodendrocyte cell death is usually caused by local inflammation and the toxic effects of some environmental factors. Valproic acid can increase cell survival and differentiation due to its diverse antioxidant, anti-apoptotic, anti-inflammatory, and neuroprotective effects. In the present study, the effects of this compound were investigated in preventing oligodendrocyte cell death in the mouse brain corpus callosum.

In this study, 40 mice were randomly divided into four groups: control, sham, cuprizone, and valproic acid/cuprizone. To kill oligodendrocyte cells, 0.2% caprizone compound was used. In addition, the combination of valproic acid was used intraperitoneally, daily with a dose of 300 mg/kg, and for three weeks. immunohistochemical and real-time methods were used to investigate the specific markers of oligodendrocyte cells.

The results showed that the percentage of cells expressing Oligodendrocyte transcription factor (Olig2) and Myelin oligodendrocyte glycoprotein (Mog) markers increased significantly in the group that received valproic acid compared to the groups that received cuprisone (P < 0.05). Also, an increase in the expression of oligodendrocytes-specific genes was reported in the Real Time-PCR method.

The results of this study showed that valproic acid can prevent oligodendrocyte cell death, therefore, the use of this compound can be a suitable solution to prevent the destruction of myelin in nerve tissue

Environmental toxic factors, with their destructive effects on nerve cells and myelin tissue, can induce nervous system dysfunction. The neuroprotective role of valproic acid as an inhibitor of Glycogen synthase kinase 3β (GSK3-β) has been proven in some neurodegenerative diseases. In the present study, the effects of this combination were investigated in preventing myelin tissue destruction and maintaining its density in the corpus callosum of mouse brain.

40 female C57BL/6 mice weighing 20-25 grams were divided into four groups including control, sham, cuprizone and, valproic acid/cuprizone groups. The valproic acid combination was used intraperitoneally, daily, and at a dose of 300 mg/kg. At the end of the research, to check myelin density, Teloidin blue staining, immunohistochemistry and, real-time methods were used.

The results showed that the density of myelin and the percentage of cells expressing the Myelin Basic Protein (MBP) marker increased significantly in the group that received valproic acid compared to the cuprizone group. In addition, the results of myelin-specific gene expression analysis showed that the use of valproic acid can increase the expression of this gene.

The results of the present study showed that valproic acid has the ability to prevent myelin tissue destruction and maintain its density, and therefore, the use of this combination can be a suitable combination to prevent and reduce the progression of diseases that destroy nerve tissue.

Many environmental factors are involved in the death of oligodendrocyte cells, myelin tissue destruction, and disturbance in the central nervous system function. The protective role of lithium chloride as a Glycogen synthase kinase 3β (GSK3-β) inhibitor has been proven in some neurological diseases. In the present study, the effects of this compound were investigated in the prevention of oligodendrocytes death in mouse brains.

In the present study, 40 female C57BL/6 mice weighing 20-25 grams were randomly divided into four groups: control, sham, cuprizone, and lithium chloride/cuprizone. Lithium chloride compound was used intra peritoneally daily. At the end of the study, in order to check the results, immunohistochemistry and Real-time PCR were used.

The results of immunohistochemistry staining showed that the percentage of cells that expressed Oligodendrocyte transcription factor (Olig2) and Myelin oligodendrocyte glycoprotein (Mog) markers increased significantly in the group that received lithium compared to the groups that received cuprizone (P < 0.05). In addition, Real-Time PCR results showed that the use of lithium can increase the expression of oligodendrocytes- specific genes.

The results of the present study showed that lithium chloride has the ability to prevent the oligodendrocytes death, and therefore, the use of this compound can be a suitable solution for preventing and reducing the progression of diseases that destroy central nervous tissue.

The disturbance of the myelination process and myelin tissue destruction leads to central nervous system dysfunction. The neuroprotective role of lithium chloride in the treatment of neurological diseases has been proven. In the present study, the effects of lithium chloride in preventing the destruction of myelin tissue induced by cuprizone in the corpus callosum of the mouse brain were investigated.

In this study, 40 female C57BL/6 mice weighing 20-25 grams were randomly divided into four groups including control, sham, cuprizone and lithium chloride/cuprizone groups. The compound of lithium chloride was used intra peritoneally at a dose of 50 mg/kg daily. At the end of the study, in order to check the average myelin density and myelin gene expression, toluidine blue staining, immunohistochemistry and Real Time-PCR were used.

The results of immunohistochemistry and toluidine blue staining showed that, the density of myelin and the percentage of cells which expressing the Myelin Basic Protein (MBP) marker increased significantly in the group which receiving lithium compared to the cuprizone group. In addition, Real Time-PCR results showed that the use of lithium can increase myelin gene expression.

The results of the present study showed that neuroprotective factors, such as lithium chloride, have the ability to prevent the destruction of myelin tissue, and therefore, the use of this combination can be a suitable manner to prevent and reduce the progression of neurodegenerative diseases.

Electrospun nanofibers have shown significant potential as an origin for forming cartilage tissue engineering scaffolds. Acellular extracellular matrices have been incorporated into nanofiber scaffolds to more closely replicate the extracellular niche. The aim of this study was to investigate the electrospinning of poly(ε-caprolactone)/extracellular matrix (PCL/ECM) and its mechanical and biological behavior for tissue engineering. PCL and PCL/ECM scaffolds were prepared via electrospinning of the 10% (w/v) solution contain PCL and PCL/ECM by dichloromethane (DCM) and dimethylsulfoxide (DMSO) solutions. The MTT technique was used to study the survival and proliferation of human adipose-derived stem cells in scaffold. The morphology, stability, and scaffold surface properties were studied using scanning electron microscopy, tensile strength test, water absorption, and contact angle measurement. The PCL/ECM electrospinning scaffold showed significant increase in hydrophobicity, water absorption, and tensile strength compared to PCL electrospinning scaffold. The porosity and diameter of the fibers in the scaffold had a relative reduction. Moreover, the viability and proliferation of cells on the seventh day showed a significant increase. The results of this study showed that adding extracellular matrix to PCL scaffold improves the properties of the scaffold for tissue engineering.