S-Space College of Veterinary Medicine (수의과대학) Dept. of Veterinary Medicine (수의학과) Journal Papers (저널논문_수의학과)
The effect of RNAi silencing of p62 using an osmotic polysorbitol transporter on autophagy and tumorigenesis in lungs of K-ras(LA1) mice
- Islam, Mohammad Ariful; Shin, Ji-Young; Yun, Cheol-Heui; Cho, Chong-Su; Seo, Hwi Won; Chae, Chanhee; Cho, Myung-Haing
- Issue Date
- Biomaterials, Vol.35 No.5, pp.1584-1596
- Autophagy activation; Tumor suppression; Polysorbitol transporter; p62 silencing; K-ras(LA1) mice
- Treating cancer patients by conventional chemotherapy to achieve prolonged survival still remains complicated. Autophagy is a topic of considerable interest in recent times, as it may contribute greatly to tumor suppression. Recent studies indicate that autophagy-deficient cells accumulate high levels of p62, an ubiquitin-binding scaffold protein, involved greatly in tumorigenesis. Here, we synthesized an osmotically active polysorbitol-mediated transporter (PSMT) to downregulate p62 using an RNAi strategy and described the mechanism of how p62 silencing using PSMT/siRNA p62 system activates autophagy and contributes to tumor suppression in the lungs of K-ras(LA1) mice. Downregulation of p62 by PSMT/siRNA p62 activated autophagy confirmed by the formation of autophagosomes and swelling of Golgi apparatus with a decreasing level of GM130, a cis-Golgi matrix protein. Activation of osmotic PSMT-mediated autophagy remarkably reduced the size and number of tumors by suppressing proliferative cell nuclear antigen, cluster of differentiation 31, and vascular endothelial growth factor levels. Furthermore, an increase in apoptosis was observed in the lungs of PSMT/siRNA p62-delivered mice. (C) 2013 Elsevier Ltd. All rights reserved.
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