We have located links that may give you full text access.
OS 15-05 HEPATOCYTE NUCLEAR FACTOR -5 ACTS AS A GLUCOSE-RESPONSIVE ELEMENT OF HUMAN ANGIOTENSINOGEN PROMOTER.
Journal of Hypertension 2016 September
OBJECTIVE: Previous studies have shown that angiotensinogen (AGT) synthesis is enhanced by high glucose (HG) in rat renal proximal tubular cells. We aimed to investigate the glucose-responsive elements within human AGT (hAGT) promoter in human immortalized proximal tubular HK-2 cells.
DESIGN AND METHOD: HK-2 cells were treated with normal glucose (NG: 5.5 mmol/L) and high glucose (HG: 15 mmol/L). Human AGT promoter region was cloned from -4358 to +122. Consecutive 5'-end deletion mutant constructs and different site-direct mutagenesis products were transfected into HK-2, followed by promoter activity measurement by dual luciferase assay. Chromatin immunoprecipitation (CHIP) assay was used to confirm protein-DNA binding.
RESULTS: Compared to NG, hAGT mRNA and protein levels were significantly increased by HG treatment for 48 hours. Region from -22 to -1,896, whose deletion attenuated the effects of HG on hAGT promoter activity, was selected as glucose-responsive region. Among corresponding transcriptional factors of glucose-responsive regions, hepatocyte nuclear factor (HNF)-5 is involved in glucose metabolism and AGT regulation. Compared to NG, HG effect on promoter activity was negligible in HK-2 transfected with HNF-5 point mutated hAGT promoter, while significantly displayed with intact hAGT promoter transfection. Reduced protein level after HNF-5 point mutation was confirmed by CHIP assay.
CONCLUSIONS: These data suggest that HG enhances human proximal tubular AGT through the activation of HNF-5.
DESIGN AND METHOD: HK-2 cells were treated with normal glucose (NG: 5.5 mmol/L) and high glucose (HG: 15 mmol/L). Human AGT promoter region was cloned from -4358 to +122. Consecutive 5'-end deletion mutant constructs and different site-direct mutagenesis products were transfected into HK-2, followed by promoter activity measurement by dual luciferase assay. Chromatin immunoprecipitation (CHIP) assay was used to confirm protein-DNA binding.
RESULTS: Compared to NG, hAGT mRNA and protein levels were significantly increased by HG treatment for 48 hours. Region from -22 to -1,896, whose deletion attenuated the effects of HG on hAGT promoter activity, was selected as glucose-responsive region. Among corresponding transcriptional factors of glucose-responsive regions, hepatocyte nuclear factor (HNF)-5 is involved in glucose metabolism and AGT regulation. Compared to NG, HG effect on promoter activity was negligible in HK-2 transfected with HNF-5 point mutated hAGT promoter, while significantly displayed with intact hAGT promoter transfection. Reduced protein level after HNF-5 point mutation was confirmed by CHIP assay.
CONCLUSIONS: These data suggest that HG enhances human proximal tubular AGT through the activation of HNF-5.
Full text links
Related Resources
Get seemless 1-tap access through your institution/university
For the best experience, use the Read mobile app
All material on this website is protected by copyright, Copyright © 1994-2024 by WebMD LLC.
This website also contains material copyrighted by 3rd parties.
By using this service, you agree to our terms of use and privacy policy.
Your Privacy Choices
You can now claim free CME credits for this literature searchClaim now
Get seemless 1-tap access through your institution/university
For the best experience, use the Read mobile app