[Effect of hypoxia on HIF-1α and its sumoylation in Jurkat cells].
OBJECTIVE
To investigate the effects of hypoxia on sumoylation of HIF-1α, as well as transcriptional activity and protein stability of HIF-1α in Jurkat cells, and explore its effect and significance on modulating the transcriptional activity of down stream target gene.


METHODS
CoCl(2) was used as a chemical inducer to simulate the hypoxia environment. Real-time fluorescence quantitative PCR and western blot were used to evaluate transcriptional activity and protein stability of HIF-1α, levels of SUMO-1 and SENP1 protein, and gene transcripts of VEGF, mdr1, mdr3, Mcl-1 and survivin respectively.


RESULTS
After 4 h, 8 h, 16 h, 24 h and 72 h after hypoxia induction, the gene transcripts of HIF-1α were 0.79 ± 0.19, 2.65 ± 2.05, 4.19 ± 4.72, 2.77 ± 3.37, 0.09 ± 0.05 and 0.69 ± 0.55-fold (P > 0.01) of that of 0h in Jurkat cells, respectively, while the protein stability increased first, then decreased (P < 0.01). SENP-1 protein up-regulated first, then down-regulated, and the SUMO-1 protein changed in an opposite trend. Excepting for survivin gene, transcriptional activities of VEGF, mdr1, mdr3, and Mcl-1 were affected by the stability of HIF-1α protein.


CONCLUSIONS
Hypoxia induces changes in SENP-1 expression, which increases the stability of HIF-1α by decreasing the sumoylation of HIF-1α and affects biological process by regulating the transcriptional activities of VEGF, mdr1, mdr3 and Mcl-1 gene.
Department of Hematology, Tongji Hospital, Tongji University, Shanghai 200065, China.
Bin-Bin
BB
Huang
Bing
B
Xiu
Hui-Na
HN
Lu
Wei
W
Qin
Ai-Bin
AB
Liang
D015687:Cell Hypoxia; D006801:Humans; D051795:Hypoxia-Inducible Factor 1, alpha Subunit / Q000235:genetics; D019169:Jurkat Cells; D012333:RNA, Messenger / Q000235:genetics; D058207:Sumoylation; D015533:Transcriptional Activation; D042461:Vascular Endothelial Growth Factor A / Q000378:metabolism
D051795:Hypoxia-Inducible Factor 1, alpha Subunit; D012333:RNA, Messenger; D042461:Vascular Endothelial Growth Factor A