Search

Background and Objectives: Multiple sclerosis (MS) is an autoimmune neurodegenerative disease of the central nervous system (CNS). Although, the contribution of various cells such as B cells, CD8+ T cells, microglia/macrophages, dendritic cells, asterocytes and mast cells in the pathogenesis of MS have been demonstrated, however, it seems that autoreactive myelin specific CD4+ T cells play a central role in pathological events contributing in MS pathogenesis. The aim was to evaluate the recent findings regarding the properties of T lymphocyte subsets and their roles in pathogenesis of MS disease. Functionally, distinct effector T cells are induced from naïve T cells upon antigenic stimulation, including Th1, Th2, Th17, Th22, Th9, and regulatory T (Treg) cells which are characterized based on their cytokine patterns. Of the activated T cells, Th1 cells secreting IFN-, Th17 cells producing IL-17, Th9 releasing IL-9, and Th22 secreting IL-22 play major roles in MS development, while Th2 cells producing IL-4, and Treg cells secreting IL-10 and TGFhave been associated with a reduction of CNS inflammation and improvement of MS. The modulation of Th1, Th17, Th9 and Th22 cells activity and the promotion of Th2 and Treg cell-related responses can be more consider for immunological treatment of MS disease. [ABSTRACT FROM AUTHOR]

Background and aims: MiRNAs are a class of non-coding RNAs that take part in various cellular processes. Recently dysregulation of these small molecules reported in numerous disorders. Unfortunately prevalence of Multiple sclerosis (MS) as an autoimmune disease is rising nowadays in Iran. Th17 cells are the most important cell in this disease. In this study, we have predicted possible role of 3 miRNAs, miR142, miR-146a and miR-150 which could control Th17 differentiation. So, possibly it influences on MS onset and progress. Methods: Using miRwalk database as an integrative database which utilizes 10 different algorithms to predict miRNA-mRNA interaction, it was investigated probable interaction of miRNAs and genes that participate in Th17 differentiation. Results: Based on this study, 3 distinct miRNAs, miR-142, miR-146a and miR-150, were predicted to have a potential role in induction of Th17 differentiation. Therefore, control of these miRNAs could reduce MS symptoms. Conclusion: Conclusively, miR-142, miR-146a and miR-150 may be up-regulated in Th17 of MS patients, since bioinformatics data have shown that these miRNAs suppress negative regulator genes in Th17 differentiation. Thus, several therapeutic approaches may be considered for these miRNAs besides of their application as the valuable prognostic/diagnostic biomarkers in detection of various stages of MS. [ABSTRACT FROM AUTHOR]

Differentiated cells can change to embryonic stem cells by reprograming. Generation of induced pluripotent stem cells (iPSCs) has revolutionized the field of regenerative and personalized medicine. iPSCs can self-renew and differentiate into many cell types. iPSC cells offer a potentially unlimited source for targeted differentiation. Through the expression of a set of transcription factors, iPSCs can be generated from different kinds of embryonic and adult cells. This technology for the first time enabled the researchers to take differentiated cells from an individual, and convert them to another cell type of interest, which is particularly to that person. When the set of master transcription factors containing OCT4, SOX2, KLF4, and MYC is expressed ectopically in somatic cells, the transcriptional network is propelled to organize itself in such a way as to maintenance a pluripotent state. Since iPSCs are similar to Embryonic Stem Cell (ESC), they can be considered as sources for modeling different diseases. iPSCs which are induced from somatic cells of patient can be useful for screening and drugs selection, and also introduce treatment via grafting the cells. Although this technology has been successful in different fields, the tumorigenesis of viral vectors during induction of reprogramming is a major challenge. Nevertheless, iPSCs are valuable for clinical applications and research. By discovery of these cells many challenges related to the safety, efficacy, and bioethics of ESCs are solved. Pluripotency is defined in two aspect of functional and molecular, by which functional regards the capacity of cell is generate three kinds of embryonic layers and germ line, and molecular aspect regards the identifying of molecules and genes that support functional features. Identification of these genes has been placed at the center of fields related to development and stem cell research. In this review, we discuss the process of generation of these cells, as well as required genes and factors for pluripotency, and also current progress in generation of iPSCs utilizing tens of reliable and new studies. [ABSTRACT FROM AUTHOR]