The promising approach of MSCs therapy for COVID-19 treatment.

Several ongoing investigations have been founded on the development of an optimized therapeutic strategy for the COVID-19 virus as an undeniable acute challenge for human life. Cell-based therapy and particularly, mesenchymal stem cells (MSCs) therapy has obtained desired outcomes in decreasing the mortality rate of severe acute respiratory syndrome coronavirus 2 (SARS-COV-2), mainly owing to its immunoregulatory impact that prevents the overactivation of the immune system. Also, these cells with their multipotent nature, are capable of repairing the damaged tissue of the lung which leads to reducing the probability of acute respiratory distress syndrome (ARDS). Although this cell-based method is not quite cost-effective for developing countries, regarding its promising results in order to treat SARS-COV-2, more economical evaluation as well as clinical trials should be performed for improving this therapeutic approach. Here in this article, the functional mechanism of MSCs therapy for the treatment of COVID-19 and the clinical trials based on this method will be reviewed. Moreover, its economic efficiency will be discussed.

Nanofiber-acellular dermal matrix as a bilayer scaffold containing mesenchymal stem cell for healing of full-thickness skin wounds.

Full-thickness skin defect is one of the main clinical problems, which cannot be repaired spontaneously. The aim of this study was to evaluate the feasibility of combining nanofibers with ADM as a bilayer scaffold for treatment of full-thickness skin wounds in a single-step procedure. The nanofibrous polycaprolactone/fibrinogen scaffolds were fabricated by electrospinning. Subsequently, mesenchymal stem cells were isolated from rat adipose tissues and characterized by flow cytometry. Cell adhesion, proliferation, and the epidermal differentiation potential of adipose-derived stem cells (ADSCs) on nanofibrous scaffolds were investigated by scanning electron microscopy (SEM), alamarBlue, and real-time PCR, respectively. In animal studies, full-thickness excisional wounds were created on the back of rats and treated with following groups: ADM, ADM-ADSCs, nanofiber, nanofiber-ADSCs, bilayer, and bilayer-ADSCs. In all groups, wounds were harvested on days 14 and 21 after treatment to evaluate re-epithelialization, blood vessel density, and collagen content. The results indicated that ADSCs seeded on ADM, nanofiber, and bilayer scaffolds can promote re-epithelialization, angiogenesis, and collagen remodeling in comparison with cell-free scaffolds. In conclusion, nanofiber-ADSCs showed the best results for re-epithelialization (according to histological scoring), average blood vessel density (92.7 ± 6.8), and collagen density (87.4 ± 4.9%) when compared to the control and other experimental groups.