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Dickkopf-1 (DKK1) phosphatase and tensin homolog on chromosome 10 (PTEN) crosstalk via microRNA interference in the diabetic heart

  • Shukuan Ling
  • Yochai Birnbaum
  • Manjyot K. Nanhwan
  • Bejoy Thomas
  • Mandeep Bajaj
  • Yu Li
  • Yinghui LiEmail author
  • Yumei YeEmail author
Original Contribution

Abstract

Competitive endogenous RNAs (ceRNAs) regulate mRNA transcripts containing common microRNA (miRNA) recognition elements (MREs) through sequestration of shared miRNAs. Interactions of ceRNA have been demonstrated in cancerous cells. However, a paucity of information is available relative to the interactions of ceRNAs interaction in diabetes mellitus and the myocardium. The purpose of this study is to assess the potential role of DKK1 and PTEN in ceRNA regulation utilizing their common miRNAs in diabetic cardiomyocytes. The interactions’ regulation between PTEN and DKK1 were determined in two diabetic models in vivo (streptozotocin-induced type-1 DM mice and db/db mice) and in vitro (human cardiomyocytes cells exposed to hyperglycemia). The levels of DKK1 and PTEN (mRNA and protein) were upregulated in parallel in all three diabetic models. DKK1 modulates PTEN protein levels in a miRNA and 3′UTR-dependent manner. RNAi-mediated DKK1 gene silencing resulted in a decreased PTEN expression and vice versa. The effect was blocked when Dicer was inhibited. Silencing either PTEN or DKK1 resulted in an increase of the availabilities of shared miRNAs. The silencing of either PTEN or DKKI resulted in a suppression end of the luciferase-PTEN 3′UTR activity. However, the over expression of DKK1 3′UTR or PTEN 3′UTR resulted in an increase in the activity. The attenuation of DKK1 increased AKT phosphorylation, improved glucose uptake and decreased apoptosis in HCMs exposed to hyperglycemia. The effects were blocked by PI3K inhibition. DKK1 and PTEN transcripts are co-upregulated in DM and hyperglycemia. DKK1 and PTEN serve as ceRNA, affecting the expression of each other via competition for miRNAs binding.

Keywords

Diabetes mellitus Competitive endogenous RNA (ceRNA) MicroRNA Dickkopf-1 (DKK1) Phosphatase and tensin homolog on chromosome 10 (PTEN) 

Notes

Acknowledgments

American Heart Association (SDG0830030N); Amylin; Merck; John S. Dunn Endowment, and National Basic Research Program of China (973 program, 2011CB707704). Yochai Birnbaum received Research grants from Merck; Forest; Roche; Astra Zeneca. Mandeep Bajaj received Research grants from American Diabetes Association, Amylin, BMS/Astra Zenica. Boehringer Ingelheim and Sanofi Aventis, and lecture fees from Sanofi Aventis, Boehringer Ingelheim and Eli-Lilly. Yumei Ye received Research grants from Merck; Forest; Roche; Astra Zeneca.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Shukuan Ling
    • 1
    • 2
    • 3
  • Yochai Birnbaum
    • 2
    • 4
  • Manjyot K. Nanhwan
    • 2
  • Bejoy Thomas
    • 2
  • Mandeep Bajaj
    • 5
  • Yu Li
    • 1
  • Yinghui Li
    • 1
    • 3
    Email author
  • Yumei Ye
    • 2
    Email author
  1. 1.School of Life Science and TechnologyHarbin Institute of TechnologyHarbinChina
  2. 2.The Department of Biochemistry and Molecular BiologyUniversity of Texas Medical BranchGalvestonUSA
  3. 3.State Key Laboratory of Space Medicine Fundamentals and ApplicationChina Astronaut Research and Training CenterBeijingChina
  4. 4.The Section of CardiologyBaylor College of MedicineHoustonUSA
  5. 5.The Section of EndocrinologyBaylor College of MedicineHoustonUSA

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