[Effect of hepatocyte-like cells induced by CD34+ cells in vitro on the repair of injured hepatic tissues of mice in vivo].
OBJECTIVE
To investigate the effect of hepatocyte-like cells induced by CD34+ cells in vitro on the repair of the injured hepatic tissues of mice in vivo.


METHODS
Mononuclear cells were isolated from umbilical blood by density gradient centrifugation and enriched CD34+ cells were obtained. The cells were (1 x 10(5) cells/mL) cultured in serum-free medium containing stem cell factor (SCF), hepatocyte growth factor (HGF), EGF, oncostatin M (OSM), bFGF (the concentration were 50, 20, 20, 10, 10 ng/mL respectively) in vitro for 10 days. Forty-eight 6-week-old female ICR mice were chosen to prepare liver injury model by injecting carbon tetrachloride and 2-acetylamionoflu-orene. The mice were randomly divided into two groups (n = 24 per group): the experimental group, the cultured cells were injected into the mice through the tail vein; the control group, the equivalent serum-free medium was injected. Six mice from each group were killed at 7, 14, 21, and 28 days after operation to receive HE staining, PCR gel electrophoresis, immunohistochemistry staining, and hepatic function detection.


RESULTS
HE staining: the morphology of injured hepatic tissues in the control group recovered to normal 28 days after operation, while in the experimental group, it recovered to normal 14 days after operation. PCR gel electrophoresis and immunohistochemistry staining: the cells expressing human serum albumin were detected in the hepatic tissue of the experimental group at each time point after operation; while in the control group, no such cells were detected within 28 days after operation. Hepatic function detection: the activity of alanine aminotransferase in the control group recovered to normal 14 days after operation; the mean activity of aspartate aminotransferase of two groups failed to recover within 28 days.


CONCLUSIONS
The hepatocyte-like cells induced by CD34+ cells in vitro can promote the morphological and functional recovery of the injured hepatic tissue in mice. Moreover, it can be transformed into human-derived hepatic cells in liver-injured mice.
Yan
Lingli
L
State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, P.R. China.
Cai
Haibo
H
Chen
Yiqi
Y
Tan
Wensong
W
D000818:Animals; D018952:Antigens, CD34; D018929:Cell Culture Techniques; D002454:Cell Differentiation; D002478:Cells, Cultured; D005260:Female; D005434:Flow Cytometry; D022781:Hepatocytes / Q000166:cytology*; D008099:Liver / Q000473:pathology*; D051379:Mice; D008813:Mice, Inbred ICR; D009000:Monocytes / Q000166:cytology*
D018952:Antigens, CD34