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The miR-200 family regulates TGF-β1-induced renal tubular epithelial to mesenchymal transition through Smad pathway by targeting ZEB1 and ZEB2 expression. 2012

Mingxia Xiong, and Lei Jiang, and Yang Zhou, and Wenjing Qiu, and Li Fang, and Rouyun Tan, and Ping Wen, and Junwei Yang
Jiangsu Diabetes Center; Center of Kidney Disease, 2nd Affiliated Hospital, Nanjing Medical Univ., Nanjing, Jiangsu Province, China.

Most chronic kidney injuries inevitably progress to irreversible renal fibrosis. Tubular epithelial-to-mesenchymal transition (EMT) is recognized to play pivotal roles in the process of renal fibrosis. However, a comprehensive understanding of the pathogenesis of renal scar formation and progression remains an urgent task for renal researchers. The endogenously produced microRNAs (miRNAs), proved to play important roles in gene regulation, probably regulate most genes involved in EMT. In this study, we applied microarray analysis to investigate the expression profiles of miRNA in murine interstitial fibrotic kidneys induced by unilateral ureteral obstruction (UUO). It was found that miR-200a and miR-141, two members of the miR-200 family, were downregulated at the early phase of UUO. In TGF-β1-induced tubular EMT in vitro, it was also found that the members of the miR-200 family were downregulated in a Smad signaling-dependent manner. It was demonstrated that the miR-200 family was responsible for protecting tubular epithelial cells from mesenchymal transition by target suppression of zinc finger E-box-binding homeobox (ZEB) 1 and ZEB2, which are E-cadherin transcriptional repressors. The results suggest that downregulation of the miR-200 family initiates the dedifferentiation of renal tubules and progression of renal fibrosis, which might provide important targets for novel therapeutic strategies.

UI MeSH Term Description Entries
D007687 Kidney Tubules, Proximal The renal tubule portion that extends from the BOWMAN CAPSULE in the KIDNEY CORTEX into the KIDNEY MEDULLA. The proximal tubule consists of a convoluted proximal segment in the cortex, and a distal straight segment descending into the medulla where it forms the U-shaped LOOP OF HENLE. Proximal Kidney Tubule,Proximal Renal Tubule,Kidney Tubule, Proximal,Proximal Kidney Tubules,Proximal Renal Tubules,Renal Tubule, Proximal,Renal Tubules, Proximal,Tubule, Proximal Kidney,Tubule, Proximal Renal,Tubules, Proximal Kidney,Tubules, Proximal Renal
D008297 Male Males
D002478 Cells, Cultured Cells propagated in vitro in special media conducive to their growth. Cultured cells are used to study developmental, morphologic, metabolic, physiologic, and genetic processes, among others. Cultured Cells,Cell, Cultured,Cultured Cell
D005355 Fibrosis Any pathological condition where fibrous connective tissue invades any organ, usually as a consequence of inflammation or other injury. Cirrhosis,Fibroses
D000071799 Zinc Finger E-box-Binding Homeobox 1 A transcription factor characterized by N-terminal and C-terminal CYS2-HIS2 ZINC FINGERS separated by a homeobox. It represses the expression of E-CADHERIN to induce the EPITHELIAL-MESENCHYMAL TRANSITION. It also represses PROTO-ONCOGENE PROTEINS C-BCL-6; regulates the cell type-specific expression of SODIUM-POTASSIUM-EXCHANGING ATPASE; and promotes neuronal differentiation. NIL-2-A Zinc Finger Protein,TCF8 Protein,Transcription Factor 8,Zeb1 Transcription Factor,NIL 2 A Zinc Finger Protein,Transcription Factor, Zeb1,Zinc Finger E box Binding Homeobox 1
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D014157 Transcription Factors Endogenous substances, usually proteins, which are effective in the initiation, stimulation, or termination of the genetic transcription process. Transcription Factor,Factor, Transcription,Factors, Transcription
D014517 Ureteral Obstruction Blockage in any part of the URETER causing obstruction of urine flow from the kidney to the URINARY BLADDER. The obstruction may be congenital, acquired, unilateral, bilateral, complete, partial, acute, or chronic. Depending on the degree and duration of the obstruction, clinical features vary greatly such as HYDRONEPHROSIS and obstructive nephropathy. Obstruction, Ureteral,Obstructions, Ureteral,Ureteral Obstructions
D015536 Down-Regulation A negative regulatory effect on physiological processes at the molecular, cellular, or systemic level. At the molecular level, the major regulatory sites include membrane receptors, genes (GENE EXPRESSION REGULATION), mRNAs (RNA, MESSENGER), and proteins. Receptor Down-Regulation,Down-Regulation (Physiology),Downregulation,Down Regulation,Down-Regulation, Receptor
D015820 Cadherins Calcium-dependent cell adhesion proteins. They are important in the formation of ADHERENS JUNCTIONS between cells. Cadherins are classified by their distinct immunological and tissue specificities, either by letters (E- for epithelial, N- for neural, and P- for placental cadherins) or by numbers (cadherin-12 or N-cadherin 2 for brain-cadherin). Cadherins promote cell adhesion via a homophilic mechanism as in the construction of tissues and of the whole animal body. Cadherin,E-Cadherins,Epithelial-Cadherin,Liver Cell Adhesion Molecules,N-Cadherins,Neural Cadherin,P-Cadherins,Uvomorulin,Cadherin-1,Cadherin-2,Cadherin-3,E-Cadherin,Epithelial-Cadherins,Liver Cell Adhesion Molecule,N-Cadherin,Neural Cadherins,P-Cadherin,Placental Cadherins,Cadherin 1,Cadherin 2,Cadherin 3,Cadherin, Neural,Cadherins, Neural,Cadherins, Placental,E Cadherin,E Cadherins,Epithelial Cadherin,Epithelial Cadherins,N Cadherin,N Cadherins,P Cadherin,P Cadherins

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