Pronounced induction of endoplasmic reticulum stress and tumor suppression by surfactant-free poly (lactic-co-glycolic acid) nanoparticles via modulation of the PI3K signaling pathway
Chia-Cheng Hou,1,6 Tsung-Lin Tsai,1,6 Wen-Pin Su,6 Hsing-Pang Hsieh,7 Chen-Sheng Yeh,4,5 Dar-Bin Shieh,1–4 Wu-Chou Su1,6 1Institute of Basic Medical Sciences, 2Institute of Oral Medicine and Department of Stomatology, 3Advanced Optoelectronic Technology Center, 4Center for Micro/Nano Scien...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Dove Medical Press
2013-07-01
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| Series: | International Journal of Nanomedicine |
| Online Access: | http://www.dovepress.com/pronounced-induction-of-endoplasmic-reticulum-stress-and-tumor-suppres-a13797 |
| Summary: | Chia-Cheng Hou,1,6 Tsung-Lin Tsai,1,6 Wen-Pin Su,6 Hsing-Pang Hsieh,7 Chen-Sheng Yeh,4,5 Dar-Bin Shieh,1–4 Wu-Chou Su1,6 1Institute of Basic Medical Sciences, 2Institute of Oral Medicine and Department of Stomatology, 3Advanced Optoelectronic Technology Center, 4Center for Micro/Nano Science and Technology, 5Department of Chemistry, 6Department of Internal Medicine, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan; 7Division of Biotechnology and Pharmaceutical Research, NHRI, Miaoli, Taiwan Background: LY294002 (LY) is a potent inhibitor of phosphatidylinositol 3-kinases (PI3Ks); however, biological applications of LY are limited by its poor solubility and pharmacokinetic profile. This study aimed at developing LY-loaded surfactant-free poly(lactic-co-glycolic acid) (PLGA) nanoparticles (SF-LY NPs) to improve the therapeutic efficacy of LY. Materials and methods: Cellular viability was measured by MTT assay. The subcellular distribution of NPs was studied using an ultraviolet-visible spectrophotometer and confocal microscope. The expression of cell-death-associated proteins was determined using Western blotting and the in vivo activity of SF-LY NPs was tested in a xenograft animal model. Results: SF-LY NPs enhanced the intracellular level of LY, induced sustained suppression of AKT, and induced marked cancer cell death. In addition, SF-LY NPs tended to accumulate in the endoplasmic reticulum (ER) and induce pronounced ER stress. Finally, SF-LY NPs exhibited a prominent antitumor effect in vivo. Conclusion: The surfactant-free formulation of PLGA is critical to the promising anticancer activity of SF-LY NPs. Keywords: LY294002, AKT, surfactant-free poly(lactic-co-glycolic acid), endoplasmic reticulum stress |
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| ISSN: | 1176-9114 1178-2013 |