Title : Sp1 is involved in 8-chloro-adenosine-upregulated death receptor 5 expression in human hepatoma cells.

Pub. Date : 2008 Jan

PMID : 18097593






8 Functional Relationships(s)
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1 Subtoxic concentration of 8-Cl-Ado sensitizes human hepatoma cells to tumor necrosis factor-related apoptosis inducing ligand (TRAIL)-triggered apoptosis. 8-chloroadenosine TNF superfamily member 10 Homo sapiens
2 Subtoxic concentration of 8-Cl-Ado sensitizes human hepatoma cells to tumor necrosis factor-related apoptosis inducing ligand (TRAIL)-triggered apoptosis. 8-chloroadenosine TNF superfamily member 10 Homo sapiens
3 However, the molecular mechanism by which TRAIL cytotoxicity is amplified by 8-Cl-Ado is unknown. 8-chloroadenosine TNF superfamily member 10 Homo sapiens
4 In the present study, we demonstrated by Western blot and real-time PCR that 8-Cl-Ado selectively up-regulated death receptor 5 (DR5), but not death receptor 4 (DR4), at both protein and RNA levels in human hepatoma cell line BEL-7402. 8-chloroadenosine TNF receptor superfamily member 10b Homo sapiens
5 In the present study, we demonstrated by Western blot and real-time PCR that 8-Cl-Ado selectively up-regulated death receptor 5 (DR5), but not death receptor 4 (DR4), at both protein and RNA levels in human hepatoma cell line BEL-7402. 8-chloroadenosine TNF receptor superfamily member 10b Homo sapiens
6 Electrophoretic mobility shift assay (EMSA) and chromatin immunoprecipitation (ChIP) confirmed that 8-Cl-Ado treatment facilitated transcription factor Sp1 binding to its cis-element -198/-189 in the DR5 promoter, suggesting that Sp1 is at least one of the 8-Cl-Ado-responsive transcription factors. 8-chloroadenosine TNF receptor superfamily member 10b Homo sapiens
7 These data allowed us to draw a conclusion that 8-Cl-Ado-enhanced DR5 expression is regulated by Sp1 binding to the -198/-189 cis-element in DR5 promoter without affecting NF-kappaB activity in the hepatoma cells. 8-chloroadenosine TNF receptor superfamily member 10b Homo sapiens
8 These data allowed us to draw a conclusion that 8-Cl-Ado-enhanced DR5 expression is regulated by Sp1 binding to the -198/-189 cis-element in DR5 promoter without affecting NF-kappaB activity in the hepatoma cells. 8-chloroadenosine TNF receptor superfamily member 10b Homo sapiens