Theranostics 2017; 7(9):2537-2554. doi:10.7150/thno.17584

Research Paper

Regulation on Toll-like Receptor 4 and Cell Barrier Function by Rab26 siRNA-loaded DNA Nanovector in Pulmonary Microvascular Endothelial Cells

Hongli Li1*, Binfeng He1*, Xueping Liu1, Jingtong Li1, Qian Liu1, Weijie Dong1, Zhi Xu1, Guisheng Qian1, Hua Zuo2, Changhua Hu2, Hang Qian1✉, Chengde Mao3, Guansong Wang1✉

1. Institute of Respiratory Diseases, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, China;
2. College of Pharmaceutical Sciences , Southwest University , Chongqing 400715, China;
3. Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA.
* These authors contributed equally.

Abstract

The small GTPase Rab26 is involved in multiple processes, such as vesicle-mediated secretion and autophagy. However, the mechanisms and functions of Rab26 in the human pulmonary microvascular endothelial cells (HPMVECs) are not clear. In this study, we thoroughly investigated the role and novel mechanism of Rab26 in permeability and apoptosis of HPMVECs using a self-assembled Rab26 siRNA loaded DNA Y-motif nanoparticle (siRab26-DYM) and Rab26 adenovirus. We found that siRab26-DYM could be efficiently transfected into HPMVECs in a time- and dose-dependent manner. Importantly, the siRab26-DYM nanovector markedly aggravated the LPS-induced apoptosis and hyper-permeability of HPMVECs by promoting the nuclear translocation of Foxo1, and subsequent activation of Toll-like receptor 4 (TLR4) signal pathway. Overexpression of Rab26 by Rab26 adenoviruses partially inactivated LPS-induced TLR4 signaling pathway, suppressed the cell apoptosis and attenuated the hyperpermeability of HPMVECs. These results suggest that the permeability and apoptosis of HPMVECs can be modulated by manipulating Rab26 derived TLR4 signaling pathway, and that Rab26 can be potential therapeutic target for the treatment of vascular diseases related to endothelial barrier functions.

Keywords: Rab26, DNA nanostructure, TLR4, human pulmonary microvascular endothelial cells, permeability.

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How to cite this article:
Li H, He B, Liu X, Li J, Liu Q, Dong W, Xu Z, Qian G, Zuo H, Hu C, Qian H, Mao C, Wang G. Regulation on Toll-like Receptor 4 and Cell Barrier Function by Rab26 siRNA-loaded DNA Nanovector in Pulmonary Microvascular Endothelial Cells. Theranostics 2017; 7(9):2537-2554. doi:10.7150/thno.17584. Available from http://www.thno.org/v07p2537.htm