[Inducible expression of hypoxia-inducible factor 1alpha on the proliferation and invasion property of HepG2 cells under normoxia in vitro].
OBJECTIVE
To study the inducible expression of hypoxia-inducible factor 1alpha (HIF-1alpha) on the proliferation and invasion property of HepG2 cells under normoxia in vitro.


METHODS
Constructed the HepG2(Tet-on-HIF-1alpha) cell line which could induce the expression of HIF-1alpha by doxycycline; Under normoxia in vitro, MTT assay was used to observe the proliferative and adhesive activity of cells, and the invasive activity was determined by transwell cell culture chamber method.


RESULTS
Under normoxia, the HIF-1alpha mRNA and protein of HepG2(Tet-on-HIF-1alpha) cells could be induced up to (5.899 +/- 2.176) and (2.179 +/- 0.742) folds by doxycycline (1 microg/ml); There were no difference of A(490 nm) between the Dox(+)and Dox(-) group in experiment detecting the proliferation activity (P > 0.05); But in adhesive experiment, the A(490 nm) of Dox (+) group was 0.662 +/- 0.058, higher than the Dox(-) group 0.526 +/- 0.808 (P = 0.008); The invasive cell number of Dox(+) group was 37.611 +/- 8.424, but in the Dox(-) group, the number was 25.333 +/- 8.117 (P < 0.01).


CONCLUSIONS
Under normoxia in vitro, the Tet-on gene regulate system could increase the HIF-1alpha protein by inducing the HIF-1alpha mRNA; HIF-1alpha has no influence with the proliferation activity, but it could enhance the adhesive and invasive properties of HepG2 cells.
Jin
Wei-dong
WD
Department of Hepatic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
Chen
Xiao-ping
XP
Yang
Sheng-li
SL
Xu
Zong-quan
ZQ
Zhang
Wan-guang
WG
D015153:Blotting, Western; D006528:Carcinoma, Hepatocellular / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D002448:Cell Adhesion; D045744:Cell Line, Tumor; D002465:Cell Movement; D049109:Cell Proliferation; D002470:Cell Survival; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D051795:Hypoxia-Inducible Factor 1, alpha Subunit / Q000235:genetics* / Q000378:metabolism / Q000502:physiology; D008113:Liver Neoplasms / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D009361:Neoplasm Invasiveness; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction
D051795:Hypoxia-Inducible Factor 1, alpha Subunit; D012333:RNA, Messenger