title: Dickkopf-1 (DKK1) phosphatase and tensin homolog on chromosome 10 (PTEN) crosstalk via microRNA interference in the diabetic heart.
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.
authors: School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang, China.
authors: Shukuan
authors: S
authors: Ling
authors: Yochai
authors: Y
authors: Birnbaum
authors: Manjyot K
authors: MK
authors: Nanhwan
authors: Bejoy
authors: B
authors: Thomas
authors: Mandeep
authors: M
authors: Bajaj
authors: Yu
authors: Y
authors: Li
authors: Yinghui
authors: Y
authors: Li
authors: Yumei
authors: Y
authors: Ye
mesh_terms: D020413:3' Untranslated Regions; D000818:Animals; D017209:Apoptosis; D001665:Binding Sites; D001667:Binding, Competitive; D001786:Blood Glucose / Q000378:metabolism; D002478:Cells, Cultured; D003921:Diabetes Mellitus, Experimental / Q000097:blood / Q000150:complications / Q000201:enzymology / Q000235:genetics*; D003922:Diabetes Mellitus, Type 1 / Q000097:blood / Q000150:complications / Q000201:enzymology / Q000235:genetics*; D003924:Diabetes Mellitus, Type 2 / Q000097:blood / Q000150:complications / Q000201:enzymology / Q000235:genetics*; D005786:Gene Expression Regulation; D017930:Genes, Reporter; D006331:Heart Diseases / Q000201:enzymology* / Q000209:etiology / Q000235:genetics / Q000473:pathology; D006801:Humans; D036341:Intercellular Signaling Peptides and Proteins / Q000235:genetics / Q000378:metabolism*; D020738:Leptin / Q000172:deficiency / Q000235:genetics; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D035683:MicroRNAs / Q000378:metabolism*; D032383:Myocytes, Cardiac / Q000187:drug effects / Q000201:enzymology* / Q000473:pathology; D051059:PTEN Phosphohydrolase / Q000172:deficiency / Q000235:genetics* / Q000378:metabolism*; D058539:Phosphatidylinositol 3-Kinase / Q000378:metabolism; D000081082:Phosphoinositide-3 Kinase Inhibitors; D010766:Phosphorylation; D047428:Protein Kinase Inhibitors / Q000494:pharmacology; D051057:Proto-Oncogene Proteins c-akt / Q000378:metabolism; D034622:RNA Interference; D012333:RNA, Messenger / Q000378:metabolism; D015398:Signal Transduction; D014162:Transfection
chemical_list: D020413:3' Untranslated Regions; D001786:Blood Glucose; C501126:DKK1 protein, human; C501127:Dkk1 protein, mouse; D036341:Intercellular Signaling Peptides and Proteins; D020738:Leptin; D035683:MicroRNAs; D000081082:Phosphoinositide-3 Kinase Inhibitors; D047428:Protein Kinase Inhibitors; D012333:RNA, Messenger; D058539:Phosphatidylinositol 3-Kinase; D051057:Proto-Oncogene Proteins c-akt; D051059:PTEN Phosphohydrolase; C494929:PTEN protein, human; C487757:Pten protein, mouse