Identification of hub genes associated with RNAi-induced silencing of XIAP through targeted proteomics approach in MCF7
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Cell & Bioscience Open Access
RESEARCH
Identification of hub genes associated with RNAi‑induced silencing of XIAP through targeted proteomics approach in MCF7 cells Mehdi Agha Gholizadeh1, Fatemeh T. Shamsabadi1, Ahad Yamchi2, Masoud Golalipour1, Gagan Deep Jhingan3 and Majid Shahbazi1,4*
Abstract Background: The X-linked inhibitor of apoptosis protein (XIAP) is the most potent caspase inhibitor of the IAP family in apoptosis pathway. This study aims to identify the molecular targets of XIAP in human breast cancer cells exposed to XIAP siRNA by proteomics screening. The expression of XIAP was reduced in MCF-7 breast cancer cells by siRNA. Cell viability and the mRNA expression level of this gene were evaluated by MTS and quantitative real-time PCR procedures, respectively. Subsequently, the XIAP protein level was visualized by Western blotting and analyzed by two-dimensional (2D) electrophoresis and LC–ESI–MS/MS. Results: Following XIAP silencing, cell proliferation was reduced in XIAP siRNA transfected cells. The mRNA transcription and protein expression of XIAP were decreased in cells exposed to XIAP siRNA than si-NEG. We identified 30 proteins that were regulated by XIAP, of which 27 down-regulated and 3 up-regulated. The most down-regulated proteins belonged to the Heat Shock Proteins family. They participate in cancer related processes including apoptosis and MAPK signaling pathway. Reduced expression of HSP90B1 was associated with apoptosis induction by androgen receptor and prostate specific antigen. Suppression of XIAP resulted in the enhancement of GDIB, ENO1, and CH60 proteins expression. The network analysis of XIAP-regulated proteins identified HSPA8, HSP90AA1, ENO1, and HSPA9 as key nodes in terms of degree and betweenness centrality methods. Conclusions: These results suggested that XIAP may have a number of biological functions in a diverse set of nonapoptotic signaling pathways and may provide an insight into the biomedical significance of XIAP over-expression in MCF-7 cells. Keywords: Breast cancer, XIAP, RNA interference, Apoptosis, Molecular targets, Proteomics Background Inhibition of the apoptotic signaling pathway plays an important role in the initiation and progression of human cancers [1]. Various molecular mechanisms cause *Correspondence: [email protected]; [email protected] 1 Medical Cellular and Molecular Research Center, Golestan University of Medical Sciences, Zip Code: 4934174515, Gorgan, Iran Full list of author information is available at the end of the article
inhibition of apoptosis in cancer cells. High expression level of inhibitor apoptosis proteins (IAPs) is one of the important mechanisms that prevent apoptosis. IAPs are a family of anti-apoptotic proteins that are conserved throughout evolution from drosophila to vertebrates [2]. These proteins directly inhibit the terminal effector caspases through BIR-dependent recognition [3]. Overexpression of the IAPs occurs in many human tumor types that lead to cancer cell survival [4, 5]. In human,
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