BACKGROUND：Cell therapy has been promising for various diseases.We investigated whether transplantation of human umbilical cord mesenchymal stem cells（h UCMSCs）has any therapeutic effects on D-galactosamine/lipopol...BACKGROUND：Cell therapy has been promising for various diseases.We investigated whether transplantation of human umbilical cord mesenchymal stem cells（h UCMSCs）has any therapeutic effects on D-galactosamine/lipopolysaccharide（Gal N/LPS）-induced fulminant hepatic failure in mice.METHODS：h UCMSCs isolated from human umbilical cord were cultured and transplanted via the tail vein into severe combined immune deficiency mice with Gal N/LPS-induced fulminant hepatic failure.After transplantation,the localization and differentiation of h UCMSCs in the injured livers were investigated by immunohistochemical and genetic analy- ses. The recovery of the injured livers was evaluated histologi- cally. The survival rate of experimental animals was analyzed by the Kaplan-Meier method and log-rank test. RESULTS： hUCMSCs expressed high levels of CD29, CD73, CD13, CD105 and CD90, but did not express CD31, CD79b, CD133, CD34, and CD45. Cultured hUCMSCs displayed adip- ogenic and osteogenic differentiation potential. Hematoxylin and eosin staining revealed that transplantation of hUCMSCs reduced hepatic necrosis and promoted liver regeneration. Transplantation of hUCMSCs prolonged the survival rate of mice with fulminant hepatic failure. Polymerase chain reaction for human alu sequences showed the presence of human cells in mouse livers. Positive staining for human albumin, human alpha-fetoprotein and human cytokeratin 18 suggested the for- mation of hUCMSCs-derived hepatocyte-like cells in vivo.CONCLUSIONS： hUCMSC was a potential candidate for stem cell based therapies. After transplantation, hUCMSCs partially repaired hepatic damage induced by GalN/LPS in mice. hUC- MSCs engrafted into the injured liver and differentiated into hepatocyte-like cells.展开更多
The cause and mechanism of fly rock in geological condition of weak intercalation are analyzed.According to the features of fly rock caused by weak intercalation,the differences of fly rock caused in weak intercalatio...The cause and mechanism of fly rock in geological condition of weak intercalation are analyzed.According to the features of fly rock caused by weak intercalation,the differences of fly rock caused in weak intercalation and general condition are distinguished.Specific to complicated circumstance of weak intercalation and town,the control measures of fly rock are given.With project examples,the control measures are scientific and rational,and have important project value.展开更多
基金supported by grants from the National Natural Science Foundation of China(81471794)Chinese High-Tech Research&Development(863)Program(SS2013AA020102)the National Science and Technology Major Project(2012ZX10002004)
文摘BACKGROUND：Cell therapy has been promising for various diseases.We investigated whether transplantation of human umbilical cord mesenchymal stem cells（h UCMSCs）has any therapeutic effects on D-galactosamine/lipopolysaccharide（Gal N/LPS）-induced fulminant hepatic failure in mice.METHODS：h UCMSCs isolated from human umbilical cord were cultured and transplanted via the tail vein into severe combined immune deficiency mice with Gal N/LPS-induced fulminant hepatic failure.After transplantation,the localization and differentiation of h UCMSCs in the injured livers were investigated by immunohistochemical and genetic analy- ses. The recovery of the injured livers was evaluated histologi- cally. The survival rate of experimental animals was analyzed by the Kaplan-Meier method and log-rank test. RESULTS： hUCMSCs expressed high levels of CD29, CD73, CD13, CD105 and CD90, but did not express CD31, CD79b, CD133, CD34, and CD45. Cultured hUCMSCs displayed adip- ogenic and osteogenic differentiation potential. Hematoxylin and eosin staining revealed that transplantation of hUCMSCs reduced hepatic necrosis and promoted liver regeneration. Transplantation of hUCMSCs prolonged the survival rate of mice with fulminant hepatic failure. Polymerase chain reaction for human alu sequences showed the presence of human cells in mouse livers. Positive staining for human albumin, human alpha-fetoprotein and human cytokeratin 18 suggested the for- mation of hUCMSCs-derived hepatocyte-like cells in vivo.CONCLUSIONS： hUCMSC was a potential candidate for stem cell based therapies. After transplantation, hUCMSCs partially repaired hepatic damage induced by GalN/LPS in mice. hUC- MSCs engrafted into the injured liver and differentiated into hepatocyte-like cells.
文摘The cause and mechanism of fly rock in geological condition of weak intercalation are analyzed.According to the features of fly rock caused by weak intercalation,the differences of fly rock caused in weak intercalation and general condition are distinguished.Specific to complicated circumstance of weak intercalation and town,the control measures of fly rock are given.With project examples,the control measures are scientific and rational,and have important project value.
