Stable H3 peptide was delivered by gold nanorods to inhibit LSD1 activation and induce human mesenchymal stem cells differentiation
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Xin Meng1,*, Jianping Li2,*, Minjuan Zheng1, Lei Zuo1, Chao Sun1, Yongsheng Zhu1, Ling Fang1, Liwen Liu1, Xiaodong Zhou1
1Department of Ultrasonography, Xijing Hospital, Fourth Military Medical University, Xi’an 710032, Shaanxi, China
2Department of Radiation Oncology, Xijing Hospital, Fourth Military Medical University, Xi’an 710032, Shaanxi, China
*These authors contributed equally to this work
Xiaodong Zhou, email: firstname.lastname@example.org
Liwen Liu, email: email@example.com
Keywords: gold nanorods (AuNRs), hepatosis, stable peptide, LSD1, human mesenchymal stem cell (human MSCs)
Received: January 11, 2017 Accepted: February 08, 2017 Published: February 18, 2017
Recently, lysine-specific demethylase 1 (LSD1), which is the first identified histone demethylase, regulates post-translational modifications and has great promise as new targets for cancer and other diseases. Moreover, the ability of LSD1 to induce the differentiation of stem cells has attracted great attention in biological fields. In this study, we designed LSD1 peptide inhibitor based on its substrate H3 peptide. Through introducing a disulfide bond to stabilize the native peptide into alpha helical structure, we get a peptide with higher cell permeability and stability compared to its parent form. Using gold nanorods (AuNRs) as delivery systems to deliver stable peptide into human MSCs, the delivery efficiency has been enhanced significantly by flow cytometry and cell fluorescent imaging. The intracellular delivery of stable peptide by AuNRs-PEI-based nanocarriers could inhibit the activation of LSD1, which together with hepatocyte growth factor (HGF) exhibits obviously synergistic effect to induce human MSCs differentiation. Furthermore, the hepatic marker genes AFP (alpha fetal protein) and ck19 are up-regulated by AuNRs-stable peptide (AuNRs- SP- PEI) with HGF. In conclusion, our study is the first time to use stable H3 peptide to inhibit LSD1 activation, which has been further delivered by AuNRs as nanocarriers into human MSCs.
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