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Luo Y, Han Y, Hu X, Yin M, Wu C, Li Q, Chen N, Zhao Y. Live-cell imaging of octaarginine-modified polymer dots via single particle tracking. Cell Prolif 2019; 52:e12556. [PMID: 30710394 PMCID: PMC6496536 DOI: 10.1111/cpr.12556] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2018] [Revised: 10/16/2018] [Accepted: 10/17/2018] [Indexed: 12/19/2022] Open
Abstract
OBJECTIVES Nanocarriers can greatly enhance the cellular uptake of therapeutic agents to regulate cell proliferation and metabolism. Nevertheless, further application of nanocarriers is often limited by insufficient understanding of the mechanisms of their uptake and intracellular behaviour. MATERIALS AND METHODS Fluorescent polymer dots (Pdots) are coated with synthetic octaarginine peptides (R8) and are analysed for cellular uptake and intracellular transportation in HeLa cervical cancer cells via single particle tracking. RESULTS Surface modification with the R8 peptide efficiently improves both cellular uptake and endosomal escape of Pdots. With single particle tracking, we capture the dynamic process of internalization and intracellular trafficking of R8-Pdots, providing new insights into the mechanism of R8 in facilitating nanostructure-based cellular delivery. Furthermore, our results reveal R8-Pdots as a novel type of autophagy inducer. CONCLUSIONS This study provides new insights into R8-mediated cellular uptake and endosomal escape of nanocarriers. It potentiates biological applications of Pdots in targeted cell imaging, drug delivery and gene regulation.
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Affiliation(s)
- Yao Luo
- College of Life Sciences, Sichuan University, Chengdu, China.,Division of Physical Biology and Bioimaging Center, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, China
| | - Yuping Han
- Division of Physical Biology and Bioimaging Center, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, China.,Development and Regeneration Key Lab of Sichuan Province, Department of Anatomy and Histology and Embryology, Chengdu Medical College, Chengdu, China
| | - Xingjie Hu
- Division of Physical Biology and Bioimaging Center, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, China.,School of Public Health, Guangzhou Medical University, Guangdong, China
| | - Min Yin
- Division of Physical Biology and Bioimaging Center, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, China.,Department of Chemistry, Shanghai Normal University, Shanghai, China
| | - Changfeng Wu
- Department of Biomedical Engineering, Southern University of Science and Technology, Shenzhen, China
| | - Qian Li
- Division of Physical Biology and Bioimaging Center, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, China
| | - Nan Chen
- Division of Physical Biology and Bioimaging Center, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, China.,Department of Chemistry, Shanghai Normal University, Shanghai, China
| | - Yun Zhao
- College of Life Sciences, Sichuan University, Chengdu, China
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