RESUMO
We report a case report of giant thymoma (17 cm×14 cm×4 cm) in a 32-year-old male patient with myasthenia gravis. Examinations revealed that the tumor invaded the mediastinum, blood vessels and pericardium, and was histologically classified as WHO type B1 and Masaoka stage III. The patient developed myasthenia gravis crisis after radical resection of the thymoma and appropriate treatments with tracheotomy were administered. The patient recovered and was discharged after a hospital stay for 252 days with a mechanical ventilation time of 102 days.
RESUMO
<p><b>OBJECTIVE</b>To investigate the effect of ecdysterone on the proliferation of human umbilical cord mesenchymal stem cells (hUCMSCs) in vitro.</p><p><b>METHODS</b>hUCMSCs isolated by enzyme digestion from human umbilical cord tissues were cultured and identified for the surface antigens using fluorescence-activated cell sorting (FACS). The cells were treated with ecdysterone at the concentrations of 0, 25, 50, 100, 150, and 200 µg/ml, and the changes in the cell proliferation were detected using MTT assay.</p><p><b>RESULTS</b>The third-passage hUCMSCs were positive for CD29 and CD105 and negative for CD34 and CD45 as shown by flow cytometry. Treatment with ecdysterone resulted in significantly increased cell proliferation as compared to the control cells (P<0.05), but no significant differences were found in cells treated with 100, 150, and 200 µg/ml ecdysterone (P>0.05). The growth curves of the cells also demonstrated the definite effect of ecdysterone in promoting the proliferation of hUCMSCs.</p><p><b>CONCLUSION</b>Ecdysterone can promote the proliferation of hUCMSCs in vitro with the optimal concentration of 100 µg/ml, suggesting its potential value in the enrichment of mesenchymal stem cells.</p>