Transcriptome‐Based Analysis of Molecular Pathways for Clusterin Functions in Kidney Cells. Issue 12 (15th June 2016)

• Record Type: Journal Article
• Authors: Dairi, Ghida; Guan, Qiunong; Roshan‐Moniri, Mani; Collins, Colin C.; Ong, Christopher J.; Gleave, Martin E.; Nguan, Christopher Y.C.; Du, Caigan
• Is Part Of: Journal of cellular physiology. Volume 231:Issue 12(2016:Dec.)
• Page Start: 2628
• Page End: 2638
• Publication Date: 2016-06-15
• Subjects: Physiology -- Periodicals; Cell physiology -- Periodicals; 571.6
• DOI: 10.1002/jcp.25415
• Languages: English
• ISSNs: 0021-9541

Abstract

Abstract : Clusterin (CLU) is a chaperone‐like protein and plays a protective role against renal ischemia‐reperfusion injury (IRI); however, the molecular pathways for its functions in the kidney are not fully understood. This study was designed to investigate CLU‐mediating pathways in kidney cells by using bioinformatics analysis. CLU null renal tubular epithelial cells (TECs) expressing human CLU cDNA (TEC‐CLU hCLU ) or empty vector (TEC‐CLU −/− ) were exposed to normoxia or hypoxia (1% O2 ). Transcriptome profiling with a significant twofold change was performed using SurePrint G3 Mouse Gene Expression 8 × 60 K microarray, and the signaling pathways was ranked by using Ingenuity pathway analysis. Here, we showed that compared to CLU null controls, ectopic expression of human CLU in CLU null kidney cells promoted cell growth but inhibited migration in normoxia, and enhanced cell survival in hypoxia. CLU expression affected expression of 3864 transcripts (1893 up‐regulated) in normoxia and 3670 transcripts (1925 up‐regulated) in hypoxia. CLU functions in normoxia were associated mostly with AKT2/PPP2R2B‐dependent PI3K/AKT, PTEN, VEGF, and ERK/MAPK signaling and as well with GSK3B‐mediated cell cycle progression. In addition to unfolded protein response (UPR) and/or endoplasmic reticulum (ER) stress, CLU‐enhanced cell survival in hypoxia was also associated with PIK3CD/MAPK1‐dependent PI3K/AKT, HIF‐α, PTEN, VEGF, and ERK/MAPK signaling. In conclusion, our data showed that CLU functions in kidney cells were mainly mediated in a cascade manner by PI3K/AKT, PTEN, VEGF, and ERK/MAPK signaling, and specifically by activation of UPR/ER stress in hypoxia, providing new insights into the protective role of CLU in the kidney. J. Cell. Physiol. 231: 2628–2638, 2016. © 2016 Wiley Periodicals, Inc. Abstract : Clusterin is a multifunctional and cytoprotective protein in kidney cells. Clusterin functions are mainly mediated in a cascade manner by PI3K/AKT, PTEN, VEGF, and ERK/MAPK signaling. In hypoxia CLU‐enhanced cell survival is specially associated with activation of UPR/ER stress pathways.