Umbilical Cord Mesenchymal Stem Cells for Inflammatory Regulation After Excision and Grafting of Severe Burn Wounds in Rats.

Severe burns predispose to shock and necessitate escharectomy and skin grafting. Previous studies show that mesenchymal stem cells are effective for burn wound healing and immune regulation. In this study, we combined escharectomy and skin grafting after burn injury with stem cell application, so as to examine the immune regulation of stem cells and the effect on the transplanted skin graft. SD rats were randomly divided into normal group, sham group, normal + hUCMSCs group, and normal + SB203580 group. Normal saline, hUCMSCs, and SB203580 were injected into the tail vein of each group, and serum inflammatory factors were detected by ELISA. The expression of p38 MAPK/NF-κB pathway proteins in rat liver was detected by western blot. Skin activity was detected by Trypan blue staining and western blot. Skin graft inflammatory infiltration was detected by histological analysis. We found that hUCMSCs could regulate the phosphorylation levels of P38MAPK and NF-B P65 proteins in the liver to reduce the inflammatory response. These effects could continue to reduce the production of inflammatory factors HMGB-1, IL-6, and TNF-α, and increase the anti-inflammatory factor IL-10. The infiltration of inflammatory cells in skin graft was significantly reduced in the normal + hUCMSCs group, and the macrophages in the hUCMSCs group polarized to the anti-inflammatory M2 direction in 3 days. However, the changes of skin graft activity and necroptosis markers protein RIP3 were not observed. The present study demonstrates the immunomodulatory effects of hUCMSCs on the systemic and skin graft microenvironment after excision.

Disorder of Muscles around Knee with Meniscus Injury: Study with Surface Electromyography / 中国康复理论与实践

Objective:To investigate the influence of meniscus injury on the function of muscles around knee in patients with meniscus injury. Methods:From February, 2017 to February, 2018, the suface electromyography of vastus lateralis (VL), rectus femoris (RF), vastus medialis (VM) and biceps femoris (BF) were recorded and analyzed in 22 patiens with unilateral meniscus injury, during squatting down-standing up test and maximal isometric voluntary contraction at knee flexing 70°. Results:During squatting down-standing up test, the average electromyography (AEMG) of VL and BF was less in affected knee than in unaffected knee (t > 3.945, Z > 3.847, P < 0.001), and the coactivity ratio of hamstrings in affected knee was higher (t > 3.650, P < 0.01). The AEMG of VL, RF, VM and BF was less in affected knee than in unaffected knee (t > 2.907, Z = 4.107, P < 0.01) during maximal isometric voluntary contraction at knee flexing 70°. Conclusion:sEMG can be used to quantitatively evaluate the muscle function around knee for patients with meniscus injury in different motion states. Patients with meniscus injury demonstrate impaired muscular function and altered muscle balance around knee, which need to be corrected during rehabilitation.

Disorder of Muscles around Knee with Meniscus Injury: Study with Surface Electromyography / 中国康复理论与实践

Objective:To investigate the influence of meniscus injury on the function of muscles around knee in patients with meniscus injury. Methods:From February, 2017 to February, 2018, the suface electromyography of vastus lateralis (VL), rectus femoris (RF), vastus medialis (VM) and biceps femoris (BF) were recorded and analyzed in 22 patiens with unilateral meniscus injury, during squatting down-standing up test and maximal isometric voluntary contraction at knee flexing 70°. Results:During squatting down-standing up test, the average electromyography (AEMG) of VL and BF was less in affected knee than in unaffected knee (t > 3.945, Z > 3.847, P < 0.001), and the coactivity ratio of hamstrings in affected knee was higher (t > 3.650, P < 0.01). The AEMG of VL, RF, VM and BF was less in affected knee than in unaffected knee (t > 2.907, Z = 4.107, P < 0.01) during maximal isometric voluntary contraction at knee flexing 70°. Conclusion:sEMG can be used to quantitatively evaluate the muscle function around knee for patients with meniscus injury in different motion states. Patients with meniscus injury demonstrate impaired muscular function and altered muscle balance around knee, which need to be corrected during rehabilitation.