In vitro Neural Cell Differentiation of Genetically Modified Human Embryonic Stem Cells Expressing Tyrosine Hydroxylase.
- Author:
Hyun Ah SHIN
;
Eun Young KIM
;
Keum Sil LEE
;
Hwang Yoon CHO
;
Yong Sik KIM
;
Won Don LEE
;
Sepill PARK
;
Jin Ho LIM
- Publication Type:In Vitro ; Original Article
- Keywords:
Human embryonic stem cell;
TH;
Differentiation;
RA;
b-FGF
- MeSH:
Antibodies;
Blotting, Western;
Cell Differentiation*;
Cell Line;
Chromatography, High Pressure Liquid;
DNA, Complementary;
Embryoid Bodies;
Embryonic Stem Cells*;
Humans*;
Immunohistochemistry;
Levodopa;
Neurons;
Transfection;
Tretinoin;
Tyrosine 3-Monooxygenase*;
Tyrosine*
- From:Korean Journal of Fertility and Sterility
2004;31(1):67-74
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
OBJECTIVE: This study was to examine in vitro neural cell differentiation pattern of the genetically modified human embryonic stem cells expressing tyrosine hydroxylase (TH). MATERIALS AND METHODS: Human embryonic stem (hES, MB03) cell was transfected with cDNAs cording for TH. Successful transfection was confirmed by western immunoblotting. Newly transfected cell line (TH#2/MB03) was induced to differentiate by two neurogenic factors retinoic acid (RA) and b-FGF. Exp. I) Upon differentiation using RA, embryoid bodies (EB, for 4 days) derived from TH#2/MB03 cells were exposed to RA (10-6 M)/AA (5x10-2 mM) for 4 days, and were allowed to differentiate in N2 medium for 7, 14 or 21 days. Exp. II) When b-FGF was used, neuronal precursor cells were expanded at the presence of b-FGF (10 ng/ml) for 6 days followed by a final differentiation in N2 medium for 7, 14 or 21 days. Neuron differentiation was examined by indirect immunocytochemistry using neuron markers (NF160 & NF200). RESULTS: After 7 days in N2 medium, approximately 80% and 20% of the RA or b-FGF induced Th#2/MB03 cells were immunoreactive to anti-NF160 and anti-NF200 antibodies, respectively. As differentiation continued, NF200 in RA treated cells significantly increased to 73.0% on 14 days compared to that in b-FGF treated cells (53.0%, p<0.05), while the proportion of cells expressing NF160 was similarly decreased between two groups. However, throughout the differentiation, expression of TH was maintained (~90%). HPLC analyses indicated the increased levels of L-DOPA in RA treated genetically modified hES cells with longer differentiation time. CONCLUSION: These results suggested that a genetically modified hES cells (TH#2/MB03) could be efficiently differentiated in vitro into mature neurons by RA induction method.
