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Hwang EJ, Jeong YIL, Lee KJ, Yu YB, Ohk SH, Lee SY. Anticancer Activity of Astaxanthin-Incorporated Chitosan Nanoparticles. Molecules 2024; 29:529. [PMID: 38276606 PMCID: PMC10818874 DOI: 10.3390/molecules29020529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Revised: 01/08/2024] [Accepted: 01/18/2024] [Indexed: 01/27/2024] Open
Abstract
Astaxanthin (AST)-encapsulated nanoparticles were fabricated using glycol chitosan (Chito) through electrostatic interaction (abbreviated as ChitoAST) to solve the aqueous solubility of astaxanthin and improve its biological activity. AST was dissolved in organic solvents and then mixed with chitosan solution, followed by a dialysis procedure. All formulations of ChitoAST nanoparticles showed small diameters (less than 400 nm) with monomodal distributions. Analysis with Fourier transform infrared (FT-IR) spectroscopy confirmed the specific peaks of AST and Chito. Furthermore, ChitoAST nanoparticles were formed through electrostatic interactions between Chito and AST. In addition, ChitoAST nanoparticles showed superior antioxidant activity, as good as AST itself; the half maximal radical scavenging concentrations (RC50) of AST and ChitoAST nanoparticles were 11.8 and 29.3 µg/mL, respectively. In vitro, AST and ChitoAST nanoparticles at 10 and 20 µg/mL properly inhibited the production of intracellular reactive oxygen species (ROSs), nitric oxide (NO), and inducible nitric oxide synthase (iNOS). ChitoAST nanoparticles had no significant cytotoxicity against RAW264.7 cells or B16F10 melanoma cells, whereas AST and ChitoAST nanoparticles inhibited the growth of cancer cells. Furthermore, AST itself and ChitoAST nanoparticles (20 µg/mL) efficiently inhibited the migration of cancer cells in a wound healing assay. An in vivo study using mice and a pulmonary metastasis model showed that ChitoAST nanoparticles were efficiently delivered to a lung with B16F10 cell metastasis; i.e., fluorescence intensity in the lung was significantly higher than in other organs. We suggest that ChitoAST nanoparticles are promising candidates for antioxidative and anticancer therapies of B16F10 cells.
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Affiliation(s)
- Eun Ju Hwang
- Marine Bio Research Center, Chosun University, Wando 59146, Jeonnam, Republic of Korea;
| | - Young-IL Jeong
- Research Institute of Convergence of Biomedical Sciences, Pusan National University Yangsan Hospital, Yangsan 50612, Gyeongnam, Republic of Korea;
| | - Kyong-Je Lee
- Department of Prosthodontics, Chosun University Dental Hospital, Gwangju 61452, Republic of Korea;
| | - Young-Bob Yu
- Department of Paramedicine, Nambu University, Gwangju 62271, Republic of Korea;
| | - Seung-Ho Ohk
- Department of Oral Microbiology, Chonnam National University School of Dentistry, Gwangju 61452, Republic of Korea
| | - Sook-Young Lee
- Marine Bio Research Center, Chosun University, Wando 59146, Jeonnam, Republic of Korea;
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Jo J, Kim JY, Yun JJ, Lee YJ, Jeong YIL. β-Cyclodextrin Nanophotosensitizers for Redox-Sensitive Delivery of Chlorin e6. Molecules 2023; 28:7398. [PMID: 37959817 PMCID: PMC10648776 DOI: 10.3390/molecules28217398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Revised: 10/30/2023] [Accepted: 10/31/2023] [Indexed: 11/15/2023] Open
Abstract
The aim of this study is to prepare redox-sensitive nanophotosensitizers for the targeted delivery of chlorin e6 (Ce6) against cervical cancer. For this purpose, Ce6 was conjugated with β-cyclodextrin (bCD) via a disulfide bond, creating nanophotosensitizers that were fabricated for the redox-sensitive delivery of Ce6 against cancer cells. bCD was treated with succinic anhydride to synthesize succinylated bCD (bCDsu). After that, cystamine was attached to the carboxylic end of bCDsu (bCDsu-ss), and the amine end group of bCDsu-ss was conjugated with Ce6 (bCDsu-ss-Ce6). The chemical composition of bCDsu-ss-Ce6 was confirmed with 1H and 13C NMR spectra. bCDsu-ss-Ce6 nanophotosensitizers were fabricated by a dialysis procedure. They formed small particles with an average particle size of 152.0 ± 23.2 nm. The Ce6 release rate from the bCDsu-ss-Ce6 nanophotosensitizers was accelerated by the addition of glutathione (GSH), indicating that the bCDsu-ss-Ce6 nanophotosensitizers have a redox-sensitive photosensitizer delivery capacity. The bCDsu-ss-Ce6 nanophotosensitizers have a low intrinsic cytotoxicity against CCD986Sk human skin fibroblast cells as well as Ce6 alone. However, the bCDsu-ss-Ce6 nanophotosensitizers showed an improved Ce6 uptake ratio, higher reactive oxygen species (ROS) production, and phototoxicity compared to those of Ce6 alone. GSH addition resulted in a higher Ce6 uptake ratio, ROS generation, and phototoxicity than Ce6 alone, indicating that the bCDsu-ss-Ce6 nanophotosensitizers have a redox-sensitive biological activity in vitro against HeLa human cervical cancer cells. In a tumor xenograft model using HeLa cells, the bCDsu-ss-Ce6 nanophotosensitizers efficiently accumulated in the tumor rather than in normal organs. In other words, the fluorescence intensity in tumor tissues was significantly higher than that of other organs, while Ce6 alone did not specifically target tumor tissue. These results indicated a higher anticancer activity of bCDsu-ss-Ce6 nanophotosensitizers, as demonstrated by their efficient inhibition of the growth of tumors in an in vivo animal tumor xenograft study.
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Affiliation(s)
- Jaewon Jo
- Gwangju Center, Korea Basic Science Institute, Gwangju 61186, Republic of Korea; (J.J.); (J.Y.K.)
- School of Chemical Engineering, Chonnam National University, Gwangju 61186, Republic of Korea
| | - Ji Yoon Kim
- Gwangju Center, Korea Basic Science Institute, Gwangju 61186, Republic of Korea; (J.J.); (J.Y.K.)
| | - Je-Jung Yun
- Research Center for Environmentally Friendly Agricultural Life Sciences, Jeonnam Bioindustry Foundation, Jeonnam 58275, Republic of Korea;
| | - Young Ju Lee
- Gwangju Center, Korea Basic Science Institute, Gwangju 61186, Republic of Korea; (J.J.); (J.Y.K.)
| | - Young-IL Jeong
- Department of Dental Materials, College of Dentistry, Chosun University, Gwangju 61452, Republic of Korea
- Tyros Biotechnology Inc., 75 Kneeland St. 14 Floors, Boston, MA 02111, USA
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Lee CM, Jeong YIL, Lim YK, Kook JK, Yang SW, Kook MS, Kim BH. The effect of cold atmospheric plasma (CAP) on the formation of reactive oxygen species and treatment of Porphyromonas gingivalis biofilm in vitro for application in treatment of peri-implantitis. KOREAN J CHEM ENG 2023. [DOI: 10.1007/s11814-022-1337-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
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Hong SO, Kook MS, Jeong YIL, Park MJ, Yang SW, Kim BH. Nanophotosensitizers Composed of Phenyl Boronic Acid Pinacol Ester-Conjugated Chitosan Oligosaccharide via Thioketal Linker for Reactive Oxygen Species-Sensitive Delivery of Chlorin e6 against Oral Cancer Cells. Materials (Basel) 2022; 15:7057. [PMID: 36295132 PMCID: PMC9604738 DOI: 10.3390/ma15207057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 09/23/2022] [Accepted: 10/04/2022] [Indexed: 06/16/2023]
Abstract
Chlorin E6 (Ce6)-incorporated nanophotosensitizers were fabricated for application in photodynamic therapy (PDT) of oral cancer cells. For this purpose, chitosan oligosaccharide (COS) was conjugated with hydrophobic and reactive oxygen species (ROS)-sensitive moieties, such as phenyl boronic acid pinacol ester (PBAP) via a thioketal linker (COSthPBAP). ThdCOOH was conjugated with PBAP to produce ThdCOOH-PBAP conjugates and then attached to amine groups of COS to produce a COSthPBAP copolymer. Ce6-incorporated nanophotosensitizers using the COSthPBAP copolymer were fabricated through the nanoprecipitation and dialysis methods. The Ce6-incorporated COSthPBAP nanophotosensitizers had a small diameter of less than 200 nm with a mono-modal distribution pattern. However, it became a multimodal and/or irregular distribution pattern when H2O2 was added. In a morphological observation using TEM, the nanophotosensitizers were disintegrated by the addition of H2O2, indicating that the COSthPBAP nanophotosensitizers had ROS sensitivity. In addition, the Ce6 release rate from the COSthPBAP nanophotosensitizers accelerated in the presence of H2O2. The SO generation was also higher in the nanophotosensitizers than in the free Ce6. Furthermore, the COSthPBAP nanophotosensitizers showed a higher intracellular Ce6 uptake ratio and ROS generation in all types of oral cancer cells. They efficiently inhibited the viability of oral cancer cells under light irradiation, but they did not significantly affect the viability of either normal cells or cancer cells in the absence of light irradiation. The COSthPBAP nanophotosensitizers showed a tumor-specific delivery capacity and fluorescence imaging of KB tumors in an in vivo animal tumor imaging study. We suggest that COSthPBAP nanophotosensitizers are promising candidates for the imaging and treatment of oral cancers.
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Affiliation(s)
- Sung-Ok Hong
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Kyung Hee University, Seoul 02447, Korea
- Department of Oral and Maxillofacial Surgery, Kyung Hee University Dental Hospital at Gangdong, Seoul 05278, Korea
| | - Min-Suk Kook
- Department of Maxillofacial Oral Surgery, School of Dentistry, Chonnam National University, Gwangju 61186, Korea
| | - Young-IL Jeong
- Department of Dental Materials, College of Dentistry, Chosun University, Gwangju 61452, Korea
| | - Min-Ju Park
- Department of Dental Materials, College of Dentistry, Chosun University, Gwangju 61452, Korea
| | - Seong-Won Yang
- Department of Ophthalmology, College of Medicine, Chosun University, Gwangju 61453, Korea
| | - Byung-Hoon Kim
- Department of Dental Materials, College of Dentistry, Chosun University, Gwangju 61452, Korea
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Yang JI, Lee HL, Yun JJ, Kim J, So KH, Jeong YIL, Kang DH. pH and Redox-Dual Sensitive Chitosan Nanoparticles Having Methyl Ester and Disulfide Linkages for Drug Targeting against Cholangiocarcinoma Cells. Materials (Basel) 2022; 15:ma15113795. [PMID: 35683095 PMCID: PMC9181436 DOI: 10.3390/ma15113795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 05/23/2022] [Accepted: 05/23/2022] [Indexed: 11/28/2022]
Abstract
The aim of this study is to prepare pH- and redox-sensitive nanoparticles for doxorubicin (DOX) delivery against DOX-resistant HuCC-T1 human cholangiocarcinoma (CCA) cells. For this purpose, L-histidine methyl ester (HIS) was attached to chitosan oligosaccharide (COS) via dithiodipropionic acid (abbreviated as ChitoHISss). DOX-incorporated nanoparticles of ChitoHISss conjugates were fabricated by a dialysis procedure. DOX-resistant HuCC-T1 cells were prepared by repetitive exposure of HuCC-T1 cells to DOX. ChitoHISss nanoparticles showed spherical morphology with a small diameter of less than 200 nm. The acid pH and glutathione (GSH) addition induced changes in the size distribution pattern of ChitoHISss nanoparticles from a narrow/monomodal distribution pattern to a wide/multimodal pattern and increased the fluorescence intensity of the nanoparticle solution. These results indicate that a physicochemical transition of nanoparticles can occur in an acidic pH or redox state. The more acidic the pH or the higher the GSH concentration the higher the drug release rate was, indicating that an acidic environment or higher redox states accelerated drug release from ChitoHISss nanoparticles. Whereas free DOX showed decreased anticancer activity at DOX-resistant HuCC-T1 cells, DOX-incorporated ChitoHISss nanoparticles showed dose-dependent anticancer activity. Intracellular delivery of DOX-incorporated ChitoHISss nanoparticles was relatively increased at an acidic pH and in the presence of GSH, indicating that DOX-incorporated ChitoHISss nanoparticles have superior acidic pH- and redox-sensitive behavior. In an in vivo tumor xenograft model, DOX-incorporated ChitoHISss nanoparticles were specifically delivered to tumor tissues and then efficiently inhibited tumor growth. We suggest that ChitoHISss nanoparticles are a promising candidate for treatment of CCA.
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Affiliation(s)
- Ju-Il Yang
- Department of Medical Science, School of Medicine, Pusan National University, Busan 50612, Korea;
- Department of Internal Medicine, Yangsan Hospital, Pusan National University, Busan 50612, Korea
| | - Hye Lim Lee
- Research Institute of Convergence of Biomedical Science and Technology, Yangsan Hospital, Pusan National University, Busan 50612, Korea; (H.L.L.); (J.K.)
| | - Je-Jung Yun
- Research Center for Environmentally Friendly Agricultural Life Science, Jeonnam Bioindustry Foundation, Gokseong-gun 57509, Korea;
| | - Jungsoo Kim
- Research Institute of Convergence of Biomedical Science and Technology, Yangsan Hospital, Pusan National University, Busan 50612, Korea; (H.L.L.); (J.K.)
| | - Kyoung-Ha So
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul 08826, Korea
- Correspondence: (K.-H.S.); (Y.-I.J.); (D.-H.K.)
| | - Young-IL Jeong
- Research Institute of Convergence of Biomedical Science and Technology, Yangsan Hospital, Pusan National University, Busan 50612, Korea; (H.L.L.); (J.K.)
- Correspondence: (K.-H.S.); (Y.-I.J.); (D.-H.K.)
| | - Dae-Hwan Kang
- Department of Medical Science, School of Medicine, Pusan National University, Busan 50612, Korea;
- Department of Internal Medicine, Yangsan Hospital, Pusan National University, Busan 50612, Korea
- Research Institute of Convergence of Biomedical Science and Technology, Yangsan Hospital, Pusan National University, Busan 50612, Korea; (H.L.L.); (J.K.)
- Correspondence: (K.-H.S.); (Y.-I.J.); (D.-H.K.)
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Kim J, Lee CM, Moon SY, Jeong YIL, Kim CS, Lee SY. Biomedical Membrane of Fish Collagen/Gellan Gum Containing Bone Graft Materials. Materials (Basel) 2022; 15:ma15082954. [PMID: 35454647 PMCID: PMC9026336 DOI: 10.3390/ma15082954] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/30/2022] [Revised: 04/15/2022] [Accepted: 04/15/2022] [Indexed: 02/07/2023]
Abstract
The development of a guided bone regeneration (GBR) membrane with non-mammalian fish collagen has the advantage of low risk for transmission of infectious diseases in tissue regeneration. In this work, a fish collagen/gellan gum and bone graft material (FC/GG-BGM) composite GBR membrane were fabricated through solution blending and casting procedures in a vacuum. The membranes were characterized using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy observation (SEM), and atomic force microscope (AFM) analyses. FT-IR results suggested that ionic interactions were formed between FC and GG both in composite powder and membranes. In vivo experiments showed that these FC/GG-BGM composite membranes could generate osteoblast minerals and promote loose bone calcification, thus accelerating bone regeneration. At 2 weeks, the defected site of rats treated with FC/GG-BGM membrane (0.377 ± 0.012 mm3) showed higher regeneration than that of rats treated with the bovine collagen membrane (0.290 ± 0.015 mm3) and control rats without membrane (0.160 ± 0.008 mm3). Compared with bovine collagen membrane, the FC/GG-BGM composite membrane displays better bone regeneration ability. Therefore, FC/GG-BGM composite membrane is suitable as a GBR membrane for bone regeneration.
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Affiliation(s)
- Jin Kim
- Department of Oral and Maxillofacial Surgery, Chosun University Dental Hospital, Gwangju 61452, Korea; (J.K.); (S.-Y.M.)
| | - Chang-Moon Lee
- School of Healthcare and Biomedical Engineering, Chonnam National University, Yeosu 59662, Korea;
- Department of Biomedical Engineering, Chonnam National University, Yeosu 59662, Korea
- Research Center of Healthcare and Biomedical Engineering, Chonnam National University, Yeosu 59662, Korea
| | - Seong-Yong Moon
- Department of Oral and Maxillofacial Surgery, Chosun University Dental Hospital, Gwangju 61452, Korea; (J.K.); (S.-Y.M.)
| | - Young-IL Jeong
- The Institute of Dental Science, Chosun University, Gwangju 61452, Korea;
| | - Chun Sung Kim
- Department of Oral Biochemistry, College of Dentistry, Chosun University, Gwangju 61452, Korea
- Correspondence: (C.S.K.); (S.-Y.L.); Tel./Fax: +82-629-737-662 (S.-Y.L.)
| | - Sook-Young Lee
- Marine Bio Research Center, Chosun University, Wando 59146, Korea
- Correspondence: (C.S.K.); (S.-Y.L.); Tel./Fax: +82-629-737-662 (S.-Y.L.)
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Yoon J, Kim H, Jeong YIL, Yang HS. CD44 Receptor-Mediated/Reactive Oxygen Species-Sensitive Delivery of Nanophotosensitizers against Cervical Cancer Cells. Int J Mol Sci 2022; 23:ijms23073594. [PMID: 35408970 PMCID: PMC8998256 DOI: 10.3390/ijms23073594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 03/17/2022] [Accepted: 03/22/2022] [Indexed: 12/10/2022] Open
Abstract
Stimulus-sensitive, nanomedicine-based photosensitizer delivery has an opportunity to target tumor tissues since oxidative stress and the expression of molecular proteins, such as CD44 receptors, are elevated in the tumor microenvironment. The aim of this study is to investigate the CD44 receptor- and reactive oxygen species (ROS)-sensitive delivery of nanophotosensitizers of chlorin e6 (Ce6)-conjugated hyaluronic acid (HA) against HeLa human cervical cancer cells. For the synthesis of nanophotosensitizers, thioketal diamine was conjugated with the carboxyl group in HA and then the amine end group of HA-thioketal amine conjugates was conjugated again with Ce6 (Abbreviated as HAthCe6). The HAthCe6 nanophotosensitizers were of small diameter, with sizes less than 200. Their morphology was round-shaped in the observations using a transmission electron microscope (TEM). The HAthCe6 nanophotosensitizers responded to oxidative stress-induced changes in size distribution when H2O2 was added to the nanophotosensitizer aqueous solution, i.e., their monomodal distribution pattern at 0 mM H2O2 was changed to dual- and/or multi-modal distribution patterns at higher concentrations of H2O2. Furthermore, the oxidative stress induced by the H2O2 addition contributed to the disintegration of HAthCe6 nanophotosensitizers in morphology, and this phenomenon accelerated the release rate of Ce6 from nanophotosensitizers. In a cell culture study using HeLa cells, nanophotosensitizers increased Ce6 uptake ratio, ROS generation and PDT efficacy compared to free Ce6. Since HA specifically bonds with the CD44 receptor of cancer cells, the pretreatment of free HA against HeLa cells decreased the Ce6 uptake ratio, ROS generation and PDT efficacy of HAthCe6 nanophotosensitizers. These results indicated that intracellular delivery of HAthCe6 nanophotosensitizers can be controlled by the CD44 receptor-mediated pathway. Furthermore, these phenomena induced CD44 receptor-controllable ROS generation and PDT efficacy by HAthCe6 nanophotosensitizers. During in vivo tumor imaging using HeLa cells, nanophotosensitizer administration showed that the fluorescence intensity of tumor tissues was relatively higher than that of other organs. When free HA was pretreated, the fluorescence intensity of tumor tissue was relatively lower than those of other organs, indicating that HAthCe6 nanophotosensitizers have CD44 receptor sensitivity and that they can be delivered by receptor-specific manner. We suggest that HAthCe6 nanophotosensitizers are promising candidates for PDT in cervical cancer.
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Affiliation(s)
- Jieun Yoon
- Department of Medicine, Graduate School, Dongguk University, Gyeongju 38067, Korea; (J.Y.); (H.K.)
| | - Howard Kim
- Department of Medicine, Graduate School, Dongguk University, Gyeongju 38067, Korea; (J.Y.); (H.K.)
| | - Young-IL Jeong
- Research Institute of Convergence of Biomedical Sciences, Pusan National University Yangsan Hospital, Gyeongnam 50612, Korea
- The Institute of Dental Science, Chosun University, Gwangju 61452, Korea
- Correspondence: (Y.-I.J.); (H.S.Y.)
| | - Hoe Saeng Yang
- Department of Obstetrics and Gynecology, Dongguk University College of Medicine, Gyeongju 38067, Korea
- Correspondence: (Y.-I.J.); (H.S.Y.)
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Yang JI, Lee HL, Choi SH, Kim J, Yu YB, Jeong YIL, Kang DH. Reactive Oxygen Species-Sensitive Nanophotosensitizers of Methoxy Poly(ethylene glycol)-Chlorin e6/Phenyl Boronic Acid Pinacol Ester Conjugates Having Diselenide Linkages for Photodynamic Therapy of Cervical Cancer Cells. Materials (Basel) 2021; 15:138. [PMID: 35009284 PMCID: PMC8746050 DOI: 10.3390/ma15010138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 12/15/2021] [Accepted: 12/20/2021] [Indexed: 06/14/2023]
Abstract
The aim of this study is to fabricate nanophotosensitizers composed of methoxy poly(ethylene glycol) (mPEG), chlorin e6 (Ce6), and phenylboronic acid pinacol ester (PBAP) with diselenide linkages for reactive oxygen species (ROS)-sensitive photodynamic therapy (PDT) of cervical cancer cells. To fabricate nanophotosensitizers, Ce6 was conjugated with mPEG via selenocystamine linkage and then remaining carboxylic acid groups of Ce6 was attached to PBAP (mPEGseseCe6PBAP conjugates). Nanophotosensitizers of mPEGseseCe6PBAP conjugates were prepared by dialysis method. In transmission electron microscope (TEM) observation, nanophotosensitizers of mPEGseseCe6PBAP conjugates have spherical shapes and their diameters were less than 150 nm. The average diameter of mPEGseseCe6PBAP nanophotosensitizers was 92.7 ± 9.6 nm in particle size analysis. When H2O2 was added to the nanophotosensitizer solution, nanophotosensitizers were sensitively disintegrated according to the H2O2 concentration and then changed from monomodal distribution to multimodal distribution in particle size distribution. Furthermore, Ce6 release from nanophotosensitizers also increased according to the H2O2 concentration. When H2O2 was added to cell culture of HeLa human cervical cancer cells, intracellular Ce6 uptake of nanophotosensitizers were gradually increased according to the H2O2 concentration, indicating that nanophotosensitizers showed ROS-sensitive delivery of Ce6 against cancer cells.As well as free Ce6, nanophotosensitizers in the absence of light irradiation have low intrinsic cytotoxicity against RAW264.7 cells and HeLa cells. However, nanophotosensitizers induced cell death dose-dependently under light irradiation. Especially, nanophotosensitizers showed significantly higher ROS generation and phototoxicity against HeLa cells in vitro. When nanophotosensitizers were intravenously administered to animal tumor xenograft model of HeLa cells, tumor tissues revealed stronger fluorescence intensity than other tissues by light irradiation while absence of light irradiation induced relatively lower fluorescence intensity in tumor tissues, indicating that nanophotosensitizers have sensitivity against oxidative stress in tumor tissues. We suggest that nanophotosensitizers of mPEGseseCe6PBAP conjugates are promising vehicle for PDT of cervical cancer cells.
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Affiliation(s)
- Ju-Il Yang
- Department of Medical Science, Pusan National University School of Medicine, Yangsan 50612, Korea;
- Department of Internal Medicine, Pusan National University Yangsan Hospital, Yangsan 50612, Korea
| | - Hye-Lim Lee
- Research Institute of Convergence of Biomedical Sciences, Pusan National University Yangsan Hospital, Yangsan 50612, Korea; (H.-L.L.); (S.-H.C.); (J.K.)
| | - Seon-Hee Choi
- Research Institute of Convergence of Biomedical Sciences, Pusan National University Yangsan Hospital, Yangsan 50612, Korea; (H.-L.L.); (S.-H.C.); (J.K.)
| | - Jungsoo Kim
- Research Institute of Convergence of Biomedical Sciences, Pusan National University Yangsan Hospital, Yangsan 50612, Korea; (H.-L.L.); (S.-H.C.); (J.K.)
| | - Young-Bob Yu
- Department of Emergency Medical Rescue, Nambu University, Gwangju 62271, Korea;
- Department of Herbal Pharmaceutical Development, Nambu University, Gwangju 62271, Korea
| | - Young-IL Jeong
- Research Institute of Convergence of Biomedical Sciences, Pusan National University Yangsan Hospital, Yangsan 50612, Korea; (H.-L.L.); (S.-H.C.); (J.K.)
| | - Dae-Hwan Kang
- Department of Medical Science, Pusan National University School of Medicine, Yangsan 50612, Korea;
- Department of Internal Medicine, Pusan National University Yangsan Hospital, Yangsan 50612, Korea
- Research Institute of Convergence of Biomedical Sciences, Pusan National University Yangsan Hospital, Yangsan 50612, Korea; (H.-L.L.); (S.-H.C.); (J.K.)
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Yoon HM, Kang MS, Choi GE, Kim YJ, Bae CH, Yu YB, Jeong YIL. Stimuli-Responsive Drug Delivery of Doxorubicin Using Magnetic Nanoparticle Conjugated Poly(ethylene glycol)- g-Chitosan Copolymer. Int J Mol Sci 2021; 22:ijms222313169. [PMID: 34884973 PMCID: PMC8658650 DOI: 10.3390/ijms222313169] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 11/30/2021] [Accepted: 12/02/2021] [Indexed: 12/27/2022] Open
Abstract
Stimuli-responsive nanoparticles are regarded as an ideal candidate for anticancer drug targeting. We synthesized glutathione (GSH) and magnetic-sensitive nanocomposites for a dual-targeting strategy. To achieve this goal, methoxy poly (ethylene glycol) (MePEG) was grafted to water-soluble chitosan (abbreviated as ChitoPEG). Then doxorubicin (DOX) was conjugated to the backbone of chitosan via disulfide linkage. Iron oxide (IO) magnetic nanoparticles were also conjugated to the backbone of chitosan to provide magnetic sensitivity. In morphological observation, images from a transmission electron microscope (TEM) showed that IO nanoparticles were embedded in the ChitoPEG/DOX/IO nanocomposites. In a drug release study, GSH addition accelerated DOX release rate from nanocomposites, indicating that nanocomposites have redox-responsiveness. Furthermore, external magnetic stimulus concentrated nanocomposites in the magnetic field and then provided efficient internalization of nanocomposites into cancer cells in cell culture experiments. In an animal study with CT26 cell-bearing mice, nanocomposites showed superior magnetic sensitivity and then preferentially targeted tumor tissues in the field of external magnetic stimulus. Nanocomposites composed of ChitoPEG/DOX/IO nanoparticle conjugates have excellent anticancer drug targeting properties.
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Affiliation(s)
- Hyun-Min Yoon
- Department of Industrial and Management Engineering, POSTECH, Gyeongbuk, Pohang 37673, Korea;
| | - Min-Su Kang
- Department of Bio and Brain Engineering, KAIST, Daejeon 34141, Korea;
| | - Go-Eun Choi
- College of Medicine, Hanyang University, Seoul 04763, Korea;
| | | | - Chang-Hyu Bae
- Department of Well-being Bioresources, Sunchon National University, Suncheon 57922, Korea;
| | - Young-Bob Yu
- Department of Emergency Medical Rescue & Department of Herbal Pharmaceutical Development, Nambu University, Gwangju 62271, Korea
- Correspondence: (Y.-B.Y.); (Y.-I.J.); Tel.: +82-62-970-0163 (Y.-B.Y.), +82-62-230-7567 (Y-.I.J)
| | - Young-IL Jeong
- The Institute of Dental Science, Chosun University, Gwangju 61452, Korea
- Research Institute of Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital, Gyeongnam, Yangsan 50612, Korea
- Correspondence: (Y.-B.Y.); (Y.-I.J.); Tel.: +82-62-970-0163 (Y.-B.Y.), +82-62-230-7567 (Y-.I.J)
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Park JS, Kim T, Kim D, Jeong YIL. The Effect of Oxidative Stress and Memantine-Incorporated Reactive Oxygen Species-Sensitive Nanoparticles on the Expression of N-Methyl-d-aspartate Receptor Subunit 1 in Brain Cancer Cells for Alzheimer's Disease Application. Int J Mol Sci 2021; 22:ijms222212309. [PMID: 34830191 PMCID: PMC8619842 DOI: 10.3390/ijms222212309] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Revised: 11/02/2021] [Accepted: 11/12/2021] [Indexed: 02/06/2023] Open
Abstract
The aim of this study is to fabricate reactive oxygen species (ROS)-sensitive nanoparticles composed of succinyl β-cyclodextrin (bCDsu), memantine and thioketal linkages for application in Alzheimer's disease, and to investigate the suppression of N-methyl-d-aspartate (NMDA) receptor 1 (NMDAR1) in cells. Thioketal diamine was attached to the carboxyl group of bCDsu to produce thioketal-decorated bCDsu conjugates (bCDsu-thioketal conjugates) and memantine was conjugated with thioketal dicarboxylic acid (memantine-thioketal carboxylic acid conjugates). Memantine-thioketal carboxylic acid conjugates were attached to bCDsu-thioketal conjugates to produce bCDsu-thioketal-memantine (bCDsuMema) conjugates. SH-SY5Y neuroblastoma cells and U87MG cells were used for NMDAR1 protein expression and cellular oxidative stress. Nanoparticles of bCDsuMema conjugates were prepared by means of a dialysis procedure. Nanoparticles of bCDsuMema conjugates had small particle sizes less than 100 nm and their morphology was found to be spherical in transmission electron microscopy observations (TEM). Nanoparticles of bCDsuMema conjugates responded to H2O2 and disintegrated or swelled in aqueous solution. Then, the nanoparticles rapidly released memantine according to the concentration of H2O2. In an in vivo animal imaging study, thioketal-decorated nanoparticles labelled with fluorescent dye such as chlorin e6 (Ce6) showed that the fluorescence intensity was stronger in the brain than in other organs, indicating that bCDsuMema nanoparticles can efficiently target the brain. When cells were exposed to H2O2, the viability of cells was time-dependently decreased. Memantine or bCDsuMema nanoparticles did not practically affect the viability of the cells. Furthermore, a western blot assay showed that the oxidative stress produced in cells using H2O2 increased the expression of NMDAR1 protein in both SH-SY5Y and U87MG cells. Memantine or bCDsuMema nanoparticles efficiently suppressed the NMDAR1 protein, which is deeply associated with Alzheimer's disease. Fluorescence microscopy also showed that H2O2 treatment induced green fluorescence intensity, which represents intracellular ROS levels. Furthermore, H2O2 treatment increased the red fluorescence intensity, which represents the NMDAR1 protein, i.e., oxidative stress increases the expression of NMDAR1 protein level in both SH-SY5Y and U87MG cells. When memantine or bCDsuMema nanoparticles were treated in cells, the oxidative stress-mediated expression of NMDAR1 protein in cells was significantly decreased, indicating that bCDsuMema nanoparticles have the capacity to suppress NMDAR1 expression in brain cells, which has relevance in terms of applications in Alzheimer's disease.
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Affiliation(s)
- Jung Sun Park
- Department of Internal Medicine, Chonnam National University Medical School, 42 Jebongro, Gwangju 61469, Korea;
| | - Taeyeon Kim
- College of Art&Science, University of Pennsylvania, 249 S 36th St., Philadelphia, PA 19104, USA;
| | - Dohoon Kim
- Department of Integrative Physiology and Pathobiology, Tufts University School of Medicine, Boston, MA 02111, USA;
| | - Young-IL Jeong
- Research Institute of Convergence of Biomedical Sciences, Pusan National University Yangsan Hospital, Yangsan 50612, Korea
- Correspondence: ; Tel.: +82-10-9212-9859
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11
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Kim H, Kim MW, Jeong YIL, Yang HS. Redox-Sensitive and Folate-Receptor-Mediated Targeting of Cervical Cancer Cells for Photodynamic Therapy Using Nanophotosensitizers Composed of Chlorin e6-Conjugated β-Cyclodextrin via Diselenide Linkage. Cells 2021; 10:cells10092190. [PMID: 34571839 PMCID: PMC8465130 DOI: 10.3390/cells10092190] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 08/12/2021] [Accepted: 08/20/2021] [Indexed: 12/12/2022] Open
Abstract
The aim of this study was to fabricate a reactive oxygen species (ROS)-sensitive and folate-receptor-targeted nanophotosensitizer for the efficient photodynamic therapy (PDT) of cervical carcinoma cells. Chlorin e6 (Ce6) as a model photosensitizer was conjugated with succinyl β-cyclodextrin via selenocystamine linkages. Folic acid (FA)-poly(ethylene glycol) (PEG) (FA-PEG) conjugates were attached to these conjugates and then FA-PEG-succinyl β-cyclodextrin-selenocystamine-Ce6 (FAPEGbCDseseCe6) conjugates were synthesized. Nanophotosensitizers of FaPEGbCDseseCe6 conjugates were fabricated using dialysis membrane. Nanophotosensitizers showed spherical shapes with small particle sizes. They were disintegrated in the presence of hydrogen peroxide (H2O2) and particle size distribution changed from monomodal distribution pattern to multimodal pattern. The fluorescence intensity and Ce6 release rate also increased due to the increase in H2O2 concentration, indicating that the nanophotosensitizers displayed ROS sensitivity. The Ce6 uptake ratio, ROS generation and cell cytotoxicity of the nanophotosensitizers were significantly higher than those of the Ce6 itself against HeLa cells in vitro. Furthermore, the nanophotosensitizers showed folate-receptor-specific delivery capacity and phototoxicity. The intracellular delivery of nanophotosensitizers was inhibited by folate receptor blocking, indicating that they have folate-receptor specificity in vitro and in vivo. Nanophotosensitizers showed higher efficiency in inhibition of tumor growth of HeLa cells in vivo compared to Ce6 alone. These results show that nanophotosensitizers of FaPEGbCDseseCe6 conjugates are promising candidates as PDT of cervical cancer.
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Affiliation(s)
- Howard Kim
- Department of Medicine, Graduate School, Dongguk University, Gyeongju 38067, Korea;
| | - Mi Woon Kim
- Department of Anesthesiology and Pain Medicine, College of Medicine, Dongguk University, Gyeongju 38067, Korea;
| | - Young-IL Jeong
- Research Institute of Convergence of Biomedical Sciences, Pusan National University Yangsan Hospital, Gyeongnam 50612, Korea
- The Institute of Dental Science, Chosun University, Gwangju 61452, Korea
- Correspondence: (Y.-I.J.); (H.S.Y.)
| | - Hoe Saeng Yang
- Department of Obstetrics and Gynecology, Dongguk University College of Medicine, Gyeongju 38067, Korea
- Correspondence: (Y.-I.J.); (H.S.Y.)
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12
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Song J, Kook MS, Kim BH, Jeong YIL, Oh KJ. Ciprofloxacin-Releasing ROS-Sensitive Nanoparticles Composed of Poly(Ethylene Glycol)/Poly(D,L-lactide-co-glycolide) for Antibacterial Treatment. Materials (Basel) 2021; 14:ma14154125. [PMID: 34361319 PMCID: PMC8348395 DOI: 10.3390/ma14154125] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Revised: 07/19/2021] [Accepted: 07/20/2021] [Indexed: 12/11/2022]
Abstract
Since urinary tract infections (UTIs) are closely associated with oxidative stress, we developed ROS-sensitive nanoparticles for ciprofloxacin (CIP) delivery for inhibition of UTI. Poly(D,L-lactide-co-glycolide) (PLGA)- selenocystamine (PLGA-selenocystamine) conjugates were attached to methoxypoly(ethylene glycol) (PEG) tetraacid (TA) (TA-PEG) conjugates to produce a copolymer (abbreviated as LGseseTAPEG). Selenocystamine linkages were introduced between PLGA and TA to endow reactive oxygen species (ROS) sensitivity to nanoparticles. CIP-incorporated nanoparticles of LGseseTAPEG copolymer were fabricated by W/O/W/W emulsion method. CIP-incorporated nanoparticles responded to H2O2 and then their morphologies were disintegrated by incubation with H2O2. Furthermore, particle size distribution of nanoparticles was changed from mono-modal distribution pattern to multi-modal distribution pattern by addition of H2O2. CIP release from nanoparticles of LGseseTAPEG copolymer was faster in the presence of H2O2 than in the absence of it. In antibacterial study using Escherichia coli (E. coli), free CIP and free CIP plus empty nanoparticles showed dose-dependent inhibitory effect against growth of bacteria while CIP-incorporated nanoparticles have less antibacterial activity compared to free CIP. These results were due to that CIP-incorporated nanoparticles have sustained release properties. When free CIP or CIP-incorporated nanoparticles were introduced into dialysis membrane to mimic in vivo situation, CIP-incorporated nanoparticles showed superior antibacterial activity compared to free CIP. At cell viability assay, nanoparticles of LGseseTAPEG copolymer have no acute cytotoxicity against L929 mouse fibroblast cells and CCD986sk human skin fibroblast cells. We suggest LGseseTAPEG nanoparticles are a promising candidate for CIP delivery.
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Affiliation(s)
- Jaeik Song
- Department of Urology, Chonnam National University Medical School, Chonnam National University Hospital, Gwangju 61469, Korea;
| | - Min-Suk Kook
- Department of Maxillofacial Surgery, School of Dentistry, Chonnam National University, Gwangju 61186, Korea;
| | - Byung-Hoon Kim
- Department of Dental Materials, School of Dentistry, Chosun University, Gwangju 61452, Korea; (B.-H.K.); (Y.-I.J.)
| | - Young-IL Jeong
- Department of Dental Materials, School of Dentistry, Chosun University, Gwangju 61452, Korea; (B.-H.K.); (Y.-I.J.)
| | - Kyung-Jin Oh
- Department of Urology, Chonnam National University Medical School, Chonnam National University Hospital, Gwangju 61469, Korea;
- Correspondence: ; Tel.: +82-62-220-6704
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13
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Choi SH, Lee DY, Kang S, Lee MK, Lee JH, Lee SH, Lee HL, Lee HY, Jeong YIL. Caffeic Acid Phenethyl Ester-Incorporated Radio-Sensitive Nanoparticles of Phenylboronic Acid Pinacol Ester-Conjugated Hyaluronic Acid for Application in Radioprotection. Int J Mol Sci 2021; 22:6347. [PMID: 34198522 PMCID: PMC8231778 DOI: 10.3390/ijms22126347] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Revised: 05/31/2021] [Accepted: 06/08/2021] [Indexed: 12/30/2022] Open
Abstract
We synthesized phenylboronic acid pinacol ester (PBPE)-conjugated hyaluronic acid (HA) via thiobis(ethylamine) (TbEA) linkage (abbreviated as HAsPBPE conjugates) to fabricate the radiosensitive delivery of caffeic acid phenetyl ester (CAPE) and for application in radioprotection. PBPE was primarily conjugated with TbEA and then PBPE-TbEA conjugates were conjugated again with hyaluronic acid using carbodiimide chemistry. CAPE-incorporated nanoparticles of HAsPBPE were fabricated by the nanoprecipitation method and then the organic solvent was removed by dialysis. CAPE-incorporated HAsPBPE nanoparticles have a small particle size of about 80 or 100 nm and they have a spherical shape. When CAPE-incorporated HAsPBPE nanoparticles were irradiated, nanoparticles became swelled or disintegrated and their morphologies were changed. Furthermore, the CAPE release rate from HAsPBPE nanoparticles were increased according to the radiation dose, indicating that CAPE-incorporated HAsPBPE nanoparticles have radio-sensitivity. CAPE and CAPE-incorporated HAsPBPE nanoparticles appropriately prevented radiation-induced cell death and suppressed intracellular accumulation of reactive oxygen species (ROS). CAPE and CAPE-incorporated HAsPBPE nanoparticles efficiently improved survivability of mice from radiation-induced death and reduced apoptotic cell death. We suggest that HAsPBPE nanoparticles are promising candidates for the radio-sensitive delivery of CAPE.
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Affiliation(s)
- Seon-Hee Choi
- Biomedical R&D Center, Pusan National University Yangsan Hospital, Gyeongnam 50612, Korea; (S.-H.C.); (H.-L.L.)
| | - Dong-Yeon Lee
- Department of Radiation Oncology, Dongnam Institute of Radiological & Medical Sciences, Pusan 46033, Korea;
| | - Sohi Kang
- Biomaterial R&BD Center, Chonnam National University, Gwangju 61186, Korea;
| | - Min-Kyung Lee
- Department of Dental Hygiene, Dong-Eui University, Pusan 47340, Korea;
| | - Jae-Heun Lee
- Department of Radiological Science, Dong-Eui University, Pusan 47340, Korea; (J.-H.L.); (S.-H.L.)
| | - Sang-Heon Lee
- Department of Radiological Science, Dong-Eui University, Pusan 47340, Korea; (J.-H.L.); (S.-H.L.)
| | - Hye-Lim Lee
- Biomedical R&D Center, Pusan National University Yangsan Hospital, Gyeongnam 50612, Korea; (S.-H.C.); (H.-L.L.)
| | - Hyo-Young Lee
- Department of Radiological Science, Dong-Eui University, Pusan 47340, Korea; (J.-H.L.); (S.-H.L.)
| | - Young-IL Jeong
- Biomedical R&D Center, Pusan National University Yangsan Hospital, Gyeongnam 50612, Korea; (S.-H.C.); (H.-L.L.)
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14
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Lee CM, Jeong YIL, Kook MS, Kim BH. Combinatorial Effect of Cold Atmosphere Plasma (CAP) and the Anticancer Drug Cisplatin on Oral Squamous Cell Cancer Therapy. Int J Mol Sci 2020; 21:ijms21207646. [PMID: 33076565 PMCID: PMC7588898 DOI: 10.3390/ijms21207646] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2020] [Revised: 10/12/2020] [Accepted: 10/13/2020] [Indexed: 12/11/2022] Open
Abstract
Cold atmospheric plasma (CAP) has been extensively investigated in the local treatment of cancer due to its potential of reactive oxygen species (ROS) generation in biological systems. In this study, we examined the synergistic effect of combination of CAP and cisplatin-mediated chemotherapy of oral squamous cell carcinoma (OSCC) in vitro. SCC-15 OSCC cells and human gingival fibroblasts (HGF-1) cells were treated with cisplatin, and then, the cells were irradiated with CAP. Following this, viability and apoptosis behavior of the cells were investigated. The viability of SCC-15 cells was inhibited by cisplatin with a dose-dependent manner and CAP treatment time. HGF-1 cells also showed decreased viability by treatment with cisplatin and CAP. Combination of 1 μM cisplatin plus 3 min of CAP treatment or 3 μM cisplatin plus 1 min of CAP treatment showed a synergistic anticancer effect with appropriate cytotoxicity against normal cells. ROS generation and dead cell staining were also increased by the increase in CAP treatment time. Furthermore, tumor-suppressor proteins and apoptosis-related enzymes also increased according to the treatment time of CAP. We showed the synergistic effect of cisplatin and CAP treatment against SCC-15 cells with low cytotoxicity against normal cells.
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Affiliation(s)
- Chang-Min Lee
- Department of Dental Materials, School of Dentistry, Chosun University, Gwangju 61452, Korea; (C.-M.L.); (Y.-I.J.)
| | - Young-IL Jeong
- Department of Dental Materials, School of Dentistry, Chosun University, Gwangju 61452, Korea; (C.-M.L.); (Y.-I.J.)
| | - Min-Suk Kook
- Department of Maxillofacial Surgery, School of Dentistry, Chonnam National University, Gwangju 61186, Korea
- Correspondence: (M.-S.K.); (B.-H.K.); Tel.: +82-62-230-6447 (B.-H.K.)
| | - Byung-Hoon Kim
- Department of Dental Materials, School of Dentistry, Chosun University, Gwangju 61452, Korea; (C.-M.L.); (Y.-I.J.)
- Correspondence: (M.-S.K.); (B.-H.K.); Tel.: +82-62-230-6447 (B.-H.K.)
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15
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Hwang KC, Choi YK, Jeong YI, Park KB, Choi EJ, Jeong YW, Hossein MS, Hyun SH, Jeung EB, Hwang WS. Demetylation of the sex-determining region Y gene promoter and incidence of disorder of sex development in cloned dog males. J Physiol Pharmacol 2020; 71. [PMID: 32991314 DOI: 10.26402/jpp.2020.3.05] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Accepted: 06/10/2020] [Indexed: 11/03/2022]
Abstract
Canine cloning is occasionally accompanied by abnormal sexual development. Some male donor cells produce cloned pups with female external genitalia and complete male gonadal dysgenesis, which is classified as an XY disorder of sex development (XY DSD). In this study, we examine the potential of 5-aza-2'-deoxycytidine (5-aza-dC), a DNA methyltransferase inhibitor, to reduce the phenotypic abnormality XY DSD in somatic cell nuclear transfer (SCNT)- derived pups. We used a 9-year-old normal male German Shepherd dog as a cell donor. Donor cells were treated with 10 nM 5-aza-dC for 4 days before being used for SCNT. At the same stage of cell development, significantly lower levels of DNA methylation of the sex-determining region Y (SRY) promoter was observed in the treated donor cells compared to that in the untreated cells (95.2% versus 53.3% on day 4 for the control and treated groups, respectively). No significant differences were observed in the control or treatment groups concerning fusion rate, pregnancy rate (30 days or entire period), the number of pups, or the incidence of XY DSD. However, more XY DSD dogs were observed in the control group (31.25%) than in the treatment group (14.29%). Hypermethylation of the SRY promoter was observed in the XY DSD cloned pups in both the treatment (84.8%) and control groups (91.1 ± 1.4%) compared to the methylation level in the phenotypically normal male pups of the treatment (23.2 ± 20.9%) and control groups (39.1 ± 20.1%). These results suggest that 5-aza-dC treatment of donor cells can reduce the methylation level of the SRY promoter in donor cells, and thus, 5-aza-dC is advantageous for reducing the incidence of XY DSD in canine cloning.
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Affiliation(s)
- K C Hwang
- Abu Dhabi Biotech Research Foundation, Kyungin-ro, Guro-gu, Seoul, Republic of Korea
| | - Y K Choi
- Abu Dhabi Biotech Research Foundation, Kyungin-ro, Guro-gu, Seoul, Republic of Korea
| | - Y I Jeong
- Abu Dhabi Biotech Research Foundation, Kyungin-ro, Guro-gu, Seoul, Republic of Korea
| | - K B Park
- Abu Dhabi Biotech Research Foundation, Kyungin-ro, Guro-gu, Seoul, Republic of Korea
| | - E J Choi
- Abu Dhabi Biotech Research Foundation, Kyungin-ro, Guro-gu, Seoul, Republic of Korea
| | - Y W Jeong
- Abu Dhabi Biotech Research Foundation, Kyungin-ro, Guro-gu, Seoul, Republic of Korea
| | - M S Hossein
- Abu Dhabi Biotech Research Foundation, Kyungin-ro, Guro-gu, Seoul, Republic of Korea
| | - S H Hyun
- Abu Dhabi Biotech Research Foundation, Kyungin-ro, Guro-gu, Seoul, Republic of Korea.,Laboratory of Veterinary Embryology and Biotechnology, College of Veterinary Medicine, Chungbuk National University, Cheongju, Chungbuk, Republic of Korea
| | - E-B Jeung
- Laboratory of Veterinary Biochemistry and Molecular Biology, College of Veterinary Medicine, Chungbuk National University, Cheongju, Chungbuk, Republic of Korea
| | - W S Hwang
- Abu Dhabi Biotech Research Foundation, Kyungin-ro, Guro-gu, Seoul, Republic of Korea.
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16
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Jeong YIL, Yoo SY, Heo J, Kang DH. Chlorin e6-Conjugated and PEGylated Immune Checkpoint Inhibitor Nanocomposites for Pulmonary Metastatic Colorectal Cancer. ACS Omega 2019; 4:18593-18599. [PMID: 31737818 PMCID: PMC6854570 DOI: 10.1021/acsomega.9b02386] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Accepted: 10/23/2019] [Indexed: 05/04/2023]
Abstract
Here we demonstrate theranostic immune checkpoint inhibitor nanocomposites (ICI NC) having an improved tumor targeting ability in pulmonary metastatic colon cancer model. Atezolizumab, a PD-L1 antibody, was conjugated with methoxy poly(ethylene glycol) (MePEG) and chlorin e6 (Ce6) via cathepsin-B-sensitive peptide as a linkage (named as ICI nanocomposites, ICI NC). This ICI NC is delivered to tumor sites enriched with tumor-specific enzymes such as cathepsin B, whereas undesired ICI exposure to normal tissue is avoided. When ICI NC were incubated with cathepsin B, Ce6 was released from ICI NC with increased fluorescence intensity in cathepsin B dose-dependent manner, which was by degradation of the peptide and then liberated Ce6 was activated in the aqueous solution. In animal pulmonary metastasis model using CT26 cells, ICI NC showed superior tumor targetability, i.e., fluorescence intensity was significantly strong in the mouse lung having metastatic tumor. On the contrary, cathepsin-B-deficient carriers such as atezolizumab-Ce6 conjugates or atezolizumab-Ce6/MePEG conjugates showed strong fluorescence intensity in the liver as well as lung. Our proposed ICI NC may be used for theranostic cancer therapy with superior tumor specificity of releasing ICI and Ce6 into tumor microenvironment, thereby showing an efficient inhibitory effect on pulmonary metastasis of CT26 cells.
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Affiliation(s)
- Young-IL Jeong
- Research
Institute for Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital, Yangsan, Gyeongnam 50612, Republic of Korea
| | - So Young Yoo
- Research
Institute for Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital, Yangsan, Gyeongnam 50612, Republic of Korea
- BIO-IT
Foundry Technology Institute, Pusan National
University, Gumjeong-gu, Busan 46241, Republic
of Korea
| | - Jeong Heo
- Department
of Internal Medicine and Biomedical Research Institute, Pusan National University Hospital, Seo-gu, Busan 49241, Republic of Korea
| | - Dae Hwan Kang
- Research
Institute for Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital, Yangsan, Gyeongnam 50612, Republic of Korea
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17
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Lee HM, Kim DH, Lee HL, Cha B, Kang DH, Jeong YIL. Synergistic effect of buthionine sulfoximine on the chlorin e6-based photodynamic treatment of cancer cells. Arch Pharm Res 2019; 42:990-999. [DOI: 10.1007/s12272-019-01179-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Accepted: 08/10/2019] [Indexed: 11/28/2022]
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18
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Song CE, Shim HH, Kuppusamy P, Jeong YIL, Lee KD. Potential Sustainable Properties of Microencapsulated Endophytic Lactic Acid Bacteria (KCC-42) in In-Vitro Simulated Gastrointestinal Juices and Their Fermentation Quality of Radish Kimchi. Biomed Res Int 2018; 2018:6015243. [PMID: 30255096 PMCID: PMC6140276 DOI: 10.1155/2018/6015243] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Revised: 07/17/2018] [Accepted: 07/29/2018] [Indexed: 11/17/2022]
Abstract
The objective of this study was to investigate alginate microencapsulated lactic acid bacteria (LAB) fermentation quality of radish kimchi sample and its potential survivability in different acidic and alkaline environments. Initially, we isolated 45 LAB strains. One of them showed fast growth pattern with potential probiotic and antifungal activities against Aspergillus flavus with a zone of inhibition calculated with 10, 8, 4mm for the 4th, 5th, and 6th day, respectively. Therefore, this strain (KCC-42) was chosen for microencapsulation with alginate biopolymer. It showed potential survivability in in-vitro simulated gastrointestinal fluid and radish kimchi fermentation medium. The survival rate of this free and encapsulated LAB KCC-42 was 6.85 × 105 and 7.48× 105 CFU/ml, respectively; the viability count was significantly higher than nonencapsulated LAB in simulated gastrointestinal juices (acid, bile, and pancreatin) and under radish kimchi fermentation environment. Kimchi sample added with this encapsulated LAB showed increased production of organic acids compared to nonencapsulated LAB sample. Also, the organic acids such as lactic acid, acetic acid, propionic acid, and succinic acid production in fermented kimchi were measured 59mM, 26mM, 14mM, and 0.6mM of g/DW, respectively. The production of metabolites such as lactic acid, acetic acid, and succinic acid and the bacteria population was high in microencapsulated LAB samples compared with free bacteria added kimchi sample. Results of this study indicate that microencapsulated LAB KCC-42 might be a useful strategy to develop products for food and healthcare industries.
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Affiliation(s)
- Chae Eun Song
- Lifelong Education Center, Chonnam National University, Kwangju 500-757, Republic of Korea
| | - Han Hyo Shim
- Department of Biotechnology, Sunchon National University, Suncheon, Jeonnam 540-742, Republic of Korea
| | - Palaniselvam Kuppusamy
- Grassland and Forage Division, National Institute of Animal Science, Rural Development Administration, Cheonan 330-801, Republic of Korea
| | - Young-IL Jeong
- Biomedical Research Institute, Pusan National University Hospital, Busan 49241, Republic of Korea
| | - Kyung Dong Lee
- Department of Oriental Medicine Materials, Dongsin University, Naju 520-714, Republic of Korea
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19
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Kim DJ, Kim J, Lee HL, Lee S, Choi JS, Kim SJ, Jeong YIL, Kang DH. Redox-Responsive Nanocomposites Composed of Graphene Oxide and Chlorin e6 for Photodynamic Treatment of Cholangiocarcinoma. B KOREAN CHEM SOC 2018. [DOI: 10.1002/bkcs.11552] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Dong Jun Kim
- Department of Internal Medicine; Pusan National University School of Medicine; Gyeongnam 50612 Republic of Korea
| | - Jungsoo Kim
- Research Institute for Convergence of Biomedical Science and Technology, Pusan National University, Yangsan Hospital; Gyeongnam 50612 Republic of Korea
| | - Hye Lim Lee
- Research Institute for Convergence of Biomedical Science and Technology, Pusan National University, Yangsan Hospital; Gyeongnam 50612 Republic of Korea
| | - Sangeun Lee
- Research Institute for Convergence of Biomedical Science and Technology, Pusan National University, Yangsan Hospital; Gyeongnam 50612 Republic of Korea
| | - Jung Sik Choi
- Department of Internal Medicine, Busan Paik Hospital, Inje University College of Medicine; Busan 47392 Republic of Korea
| | - Su Jin Kim
- Department of Internal Medicine; Pusan National University School of Medicine; Gyeongnam 50612 Republic of Korea
| | - Young-IL Jeong
- Research Institute for Convergence of Biomedical Science and Technology, Pusan National University, Yangsan Hospital; Gyeongnam 50612 Republic of Korea
| | - Dae Hwan Kang
- Department of Internal Medicine; Pusan National University School of Medicine; Gyeongnam 50612 Republic of Korea
- Research Institute for Convergence of Biomedical Science and Technology, Pusan National University, Yangsan Hospital; Gyeongnam 50612 Republic of Korea
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20
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Lee HL, Choi CW, Kim J, Cha B, Nah JW, Hong JS, Hwang SC, Jeong YIL, Kang DH. Antimetastatic Activity of Gallic Acid-conjugated Chitosan against Pulmonary Metastasis of Colon Carcinoma Cells. B KOREAN CHEM SOC 2017. [DOI: 10.1002/bkcs.11351] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Hye Lim Lee
- Biomedical Research Institute; Pusan National University Hospital; Busan 49241 Republic of Korea
- School of Medicine; Ajou University; Suwon 61005 Republic of Korea
| | - Cheol Woong Choi
- Department of Internal Medicine; Pusan National University School of Medicine; Gyeongnam 50612 Republic of Korea
| | - Jungsoo Kim
- Biomedical Research Institute; Pusan National University Hospital; Busan 49241 Republic of Korea
| | - Byungyoul Cha
- Gimhae Biomedical Center; Gyeongnam 50969 South Korea
| | - Jae Woon Nah
- Department of Polymer Science and Engineering; Sunchon National University; Jeonnam 57922 Republic of Korea
| | - Jeong Sup Hong
- Division of Animal Care; Yonam College; Chungnam 31005 South Korea
| | - Sung Chul Hwang
- School of Medicine; Ajou University; Suwon 61005 Republic of Korea
| | - Young-IL Jeong
- Biomedical Research Institute; Pusan National University Hospital; Busan 49241 Republic of Korea
- Research Institute for Convergence of Biomedical Science and Technology; Pusan National University Yang San Hospital; Gyeongnam 50612 Republic of Korea
| | - Dae Hwan Kang
- Biomedical Research Institute; Pusan National University Hospital; Busan 49241 Republic of Korea
- Department of Internal Medicine; Pusan National University School of Medicine; Gyeongnam 50612 Republic of Korea
- Research Institute for Convergence of Biomedical Science and Technology; Pusan National University Yang San Hospital; Gyeongnam 50612 Republic of Korea
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Jeong YIL, Cha B, Lee HL, Song YH, Jung YH, Kwak TW, Choi C, Jeong GW, Nah JW, Kang DH. Simple nanophotosensitizer fabrication using water-soluble chitosan for photodynamic therapy in gastrointestinal cancer cells. Int J Pharm 2017; 532:194-203. [DOI: 10.1016/j.ijpharm.2017.08.128] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Revised: 08/06/2017] [Accepted: 08/22/2017] [Indexed: 10/18/2022]
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Park HK, Lee SJ, Oh JS, Lee SG, Jeong YIL, Lee HC. Smart Nanoparticles Based on Hyaluronic Acid for Redox-Responsive and CD44 Receptor-Mediated Targeting of Tumor. Nanoscale Res Lett 2015; 10:981. [PMID: 26163139 PMCID: PMC4499038 DOI: 10.1186/s11671-015-0981-5] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2015] [Accepted: 06/14/2015] [Indexed: 05/27/2023]
Abstract
BACKGROUND Since aggressive cancer cells highly express the CD44 receptor compared to normal cells, hyaluronic acid (HA) can be used for CD44 targeting molecule. Since glutathione (GSH) level is normally elevated in the intracellular compartment and in the tumor cell, the fact that disulfide bond can be cleaved by GSH is widely used for intracellular drug delivery. METHODS HA was connected with poly(DL-lactide-co-glycolide) (PLGA) using disulfide linkage, and then a diblock copolymer (HAssLG) was prepared. Doxorubicin (DOX)-loaded HAssLG nanoparticles were prepared by dialysis procedures. RESULTS AND DISCUSSION DOX-loaded HAssLG nanoparticles have spherical shapes with small particle size of less than 300 nm. In fluorescence measurement, DOX was dose-dependently liberated from nanoparticles by the addition of GSH. DOX release rate from HAssLG nanoparticles was increased by the addition of GSH. To confirm CD44 receptor-mediated endocytosis of nanoparticles, CD44-positive MDA-MB231 cells were employed and fluorescence intensity was strong when nanoparticles were treated to tumor cells. However, fluorescence intensity was significantly decreased through blocking of the CD44 receptor by pretreatment of cells with free HA. Fluorescence intensity of cells was increased again when GSH was added, indicating that HAssLG nanoparticles have CD44 receptor targetability and potential of redox-responsive drug delivery. For animal imaging study, CD44-positive MDA-MB231 cells and CD44-negative NIH3T3 cells were simultaneously implanted into the right flank and left flank of mice, respectively. Fluorescence intensity was significantly stronger at tumor mass of MDA-MB231 cells than solid mass of NIH3T3 cells, indicating that HAssLG nanoparticles were specifically delivered to tumor cells. CONCLUSIONS The results indicated that HAssLG nanoparticles have specificity against the CD44 receptor and can be used for anticancer drug targeting. We recommend HAssLG nanoparticles as a promising vehicle for cancer drug targeting.
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Affiliation(s)
- Hyung-Kyu Park
- />Department of Microbiology, Chonnam National University Medical School, 160, Baekseo-ro, Dong-gu, Gwangju, 501-746 Republic of Korea
| | - Sang Joon Lee
- />Department of Biomedical Sciences, Chonnam National University Medical School, Gwangju, 501-746 Republic of Korea
| | - Jong-Suk Oh
- />Department of Microbiology, Chonnam National University Medical School, 160, Baekseo-ro, Dong-gu, Gwangju, 501-746 Republic of Korea
| | - Sam-Gyu Lee
- />Department of Physical and Rehabilitation Medicine, Chonnam National University Medical School, Gwangju, 501-746 Republic of Korea
| | - Young-IL Jeong
- />Biomedical Research Institute, Pusan National University Hospital, Pusan, 602-739 Republic of Korea
| | - Hyun Chul Lee
- />Department of Microbiology, Chonnam National University Medical School, 160, Baekseo-ro, Dong-gu, Gwangju, 501-746 Republic of Korea
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23
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Kim HY, Ryu JH, Chu CW, Son GM, Jeong YIL, Kwak TW, Kim DH, Chung CW, Rhee YH, Kang DH, Kim HW. Paclitaxel-incorporated nanoparticles using block copolymers composed of poly(ethylene glycol)/poly(3-hydroxyoctanoate). Nanoscale Res Lett 2014; 9:525. [PMID: 25288916 PMCID: PMC4184469 DOI: 10.1186/1556-276x-9-525] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2014] [Accepted: 09/20/2014] [Indexed: 05/07/2023]
Abstract
Block copolymers composed of poly(3-hydroxyoctanoate) (PHO) and methoxy poly(ethylene glycol) (PEG) were synthesized to prepare paclitaxel-incorporated nanoparticle for antitumor drug delivery. In a (1)H-NMR study, chemical structures of PHO/PEG block copolymers were confirmed and their molecular weight (M.W.) was analyzed with gel permeation chromatography (GPC). Paclitaxel as a model anticancer drug was incorporated into the nanoparticles of PHO/PEG block copolymer. They have spherical shapes and their particle sizes were less than 100 nm. In a (1)H-NMR study in D2O, specific peaks of PEG solely appeared while peaks of PHO disappeared, indicating that nanoparticles have core-shell structures. The higher M.W. of PEG decreased loading efficiency and particle size. The higher drug feeding increased drug contents and average size of nanoparticles. In the drug release study, the higher M.W. of PEG block induced the acceleration of drug release rate. The increase in drug contents induced the slow release rate of drug. In an antitumor activity study in vitro, paclitaxel nanoparticles have practically similar anti-proliferation activity against HCT116 human colon carcinoma cells. In an in vivo animal study using HCT116 colon carcinoma cell-bearing mice, paclitaxel nanoparticles have enhanced antitumor activity compared to paclitaxel itself. Therefore, paclitaxel-incorporated nanoparticles of PHO/PEG block copolymer are a promising vehicle for antitumor drug delivery.
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Affiliation(s)
- Hyun Yul Kim
- Department of Surgery, National Research & Development Center for Hepatobiliary Cancer, Pusan National University Yangsan Hospital, Gyeongnam 626-770, Republic of Korea
| | - Je Ho Ryu
- Department of Surgery, National Research & Development Center for Hepatobiliary Cancer, Pusan National University Yangsan Hospital, Gyeongnam 626-770, Republic of Korea
| | - Chong Woo Chu
- Department of Surgery, National Research & Development Center for Hepatobiliary Cancer, Pusan National University Yangsan Hospital, Gyeongnam 626-770, Republic of Korea
| | - Gyung Mo Son
- Department of Surgery, National Research & Development Center for Hepatobiliary Cancer, Pusan National University Yangsan Hospital, Gyeongnam 626-770, Republic of Korea
| | - Young-IL Jeong
- Biomedical Research Institute, Pusan National University Hospital, Pusan 602-739, Republic of Korea
| | - Tae-Won Kwak
- Biomedical Research Institute, Pusan National University Hospital, Pusan 602-739, Republic of Korea
| | - Do Hyung Kim
- Biomedical Research Institute, Pusan National University Hospital, Pusan 602-739, Republic of Korea
| | - Chung-Wook Chung
- Biomedical Research Institute, Pusan National University Hospital, Pusan 602-739, Republic of Korea
| | - Young Ha Rhee
- Department of Microbiology, Chungnam National University, Daejeon 305-764, Korea
| | - Dae Hwan Kang
- Biomedical Research Institute, Pusan National University Hospital, Pusan 602-739, Republic of Korea
- National Research & Development Center for Hepatobiliary Cancer, Pusan National University Yangsan Hospital, Gyeongnam 626-770, Republic of Korea
| | - Hyung Wook Kim
- Department of Internal Medicine, Pusan National University Yangsan Hospital, Gyeongnam 626-770, Republic of Korea
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Chung CW, Kim CH, Lee HM, Kim DH, Kwak TW, Chung KD, Jeong YIL, Kang DH. Aminolevulinic acid derivatives-based photodynamic therapy in human intra- and extrahepatic cholangiocarcinoma cells. Eur J Pharm Biopharm 2013; 85:503-10. [DOI: 10.1016/j.ejpb.2013.01.022] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2012] [Revised: 01/09/2013] [Accepted: 01/30/2013] [Indexed: 11/28/2022]
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25
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Han QF, Jeong YI, Heo JH, Shin CM, Ryu H, Park MS, Lee WJ, Yoon JH, Yang JE, Choi H. Magnesium-doped zinc oxide electrochemically grown on fluorine-doped tin oxide substrate. J Nanosci Nanotechnol 2012; 12:3677-3681. [PMID: 22849195 DOI: 10.1166/jnn.2012.5634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Nanostructures of magnesium (Mg) doped Zinc oxide (ZnO) were successfully deposited on conducting fluorine-doped tin oxide (FTO) coated glass plates by cathodic electrochemical deposition method at different potentials and temperature conditions. The deposited samples were characterized by XRD and SEM techniques to confirm their structures, morphologies and optical properties. These measurements show that Mg doped ZnO has a wurtzite structure and that the strongest intensity of the (002) peak is found at 60 degrees C and -1.0 V. Tunable transmittance of Mg doped ZnO has a band gap energy from 3.45 eV to 3.82 eV, which is the direct evidence of doping.
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Affiliation(s)
- Q F Han
- Department of Nano Systems Engineering, Center for Nano Manufacturing Inje University, Gyeongnam 621-749, Korea
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26
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Ogawa Y, Kanatsu K, Iino T, Kato S, Jeong YI, Shibata N, Takada K, Takeuchi K. Protection against dextran sulfate sodium-induced colitis by microspheres of ellagic acid in rats. Life Sci 2002; 71:827-39. [PMID: 12074942 DOI: 10.1016/s0024-3205(02)01737-x] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Ellagic acid (EA), a naturally occurring plant phenol, has the antioxidant and anti-inflammatory activities. In the present study, we examined the effect of EA contained in microspheres on the ulcerative colitis induced experimentally in rats by dextran sulfate sodium (DSS). Experimental colitis was induced in male Fisher 344 rats by daily treatment with 3% DSS solution in drinking water for 7 days. EA of microspheres (mcEA: 1 approximately 10 mg/kg as EA contents) was administered p.o. twice daily for 6 days. In a preliminary study, we found that these microsphere capsules, when administered p.o., are effectively dissolved in the proximal to the ileo-cecal junction and distributed to the terminal ileum and the colon. The ulceration area, colon length, and mucosal myeloperoxidase (MPO) activity as well as thiobarbituric acid-reactive substances (TBARS) were measured on 7th day after the onset of DSS treatment. The DSS treatment for 7 days caused severe mucosal lesions in the colon, accompanied with the increases of MPO activity and TBARS as well as the decreases of body weight gain and colon length. Administration of mcEA reduced the severity of DSS-induced colitis in a dose-dependent manner, and a significant effect was observed at 10 mg/kg, the ED50 being 2.3 mg/kg. This mcEA treatment also significantly mitigated changes in various biochemical parameters in the colonic mucosa induced by DSS. Although plain EA (without using microspheres) was also effective in reducing the severity of DSS-induced colitis, this effect was much less potent as compared with that of mcEA; the ED50 was about 15 times higher than that of mcEA. In addition, a significant effect on DSS-induced colitis was also obtained by intra-rectal administration of superoxide dismutase, an anti-oxidative agent. These results suggest that EA prevents the ulcerative colitis induced by DSS, probably by radical scavenging and/or anti-oxidative actions. The microspheres used in this study may be useful for delivering an orally administered drug specifically to the colon.
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Affiliation(s)
- Y Ogawa
- Department of Pharmacology and Experimental Therapeutics, Kyoto Pharmaceutical University, Misasagi, Yamashina, Kyoto, Japan
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27
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Jeong YI, Prasad Yv R, Ohno T, Yoshikawa Y, Shibata N, Kato S, Takeuchi K, Takada K. Application of Eudragit P-4135F for the delivery of ellagic acid to the rat lower small intestine. J Pharm Pharmacol 2001; 53:1079-85. [PMID: 11518017 DOI: 10.1211/0022357011776469] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
Based on the assumption that the delivery of ellagic acid to its site of action would show an antiinflammatory activity in inflammatory bowel disease (IBD), we have prepared microspheres using a new pH-sensitive polymer, Eudragit P-4135F (P-4135F), to deliver ellagic acid to the lower small intestine in rats. The microspheres were spherical in shape and the mean diameters were approximately 100-150 microm. The amount of ellagic acid released from the microspheres decreased by increasing the formulated amount of P-4135F. The release characteristics of ellagic acid were pH-dependent. By considering the factors loading efficiency and microsphere particle size distribution, ellagic acid-2 microspheres (P-4135F/ellagic acid = 1.65) were selected for further investigation. In a dissolution study, more than 95% ellagic acid was released within 0.5 h in pH 7.4 and 8.0 buffers. The release percent of ellagic acid was less than 40% in pH 6.8 and 7.0 and was less than 10% in pH 5.6 and 5.9. To observe the dissolution sites of the microspheres in the rat small intestine fluorescein was formulated in the microspheres as a tracer drug along with ellagic acid (50 mg kg(-1)). After intraduodenal administration of fluorescein-labelled microspheres to rats, the plasma fluorescein level started to increase at 0.5 h, by which time the microspheres had reached the middle part of the ileum. Microspheres started to dissolve within 1.0 h and the peak plasma fluorescein concentration was observed at 3.0 h, when the majority of the administered microspheres were dissolved in the terminal ileum. These results suggested that P-4135F microspheres could deliver ellagic acid to the lower part of the small intestine, and that the released ellagic acid would be distributed into the caecum and the ascending colon.
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Affiliation(s)
- Y I Jeong
- Department of Pharmacokinetics, Kyoto Pharmaceutical University, Japan
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28
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Jeong YI, Ohno T, Hu Z, Yoshikawa Y, Shibata N, Nagata S, Takada K. Evaluation of an intestinal pressure-controlled colon delivery capsules prepared by a dipping method. J Control Release 2001; 71:175-82. [PMID: 11274749 DOI: 10.1016/s0168-3659(01)00211-5] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A new method for preparation of large amounts of empty pressure-controlled colon delivery capsules (PCDCs) by a dipping method has been developed. Empty PCDCs are composed of two polymer membranes. The inner one was a water-insoluble polymer membrane, ethylcellulose (EC). The outer one was an enteric polymer membrane, hydroxypropylmethylcellulose phthalate (HPMCP) or hydroxypropylmethylcellulose acetate succinate (HPMCAS). By consequently dipping into an ethanolic EC solution and an alkalized enteric polymer solution, empty PCDCs were obtained after both the capsule body and cap were adjusted to the size of #2 capsules. With each enteric polymer, two types of empty PCDCs of different thickness were prepared. Fluorescein (FL) was formulated with suppository base, PEG1000, and used as a model drug. FL/PEG1000 suspension was introduced into empty PCDCs which were then sealed with enteric polymer solution. The PCDCs were evaluated by an in vivo experiment using beagle dogs. After oral administration of the test PCDC preparations containing 30 mg of FL, blood samples were obtained from the jugular vein and serum FL levels were measured. The thickness of the EC membrane layer varied in both the capsule body and cap. HPMCAS PCDCs had 62.1+/-5.0 (S.E.) microm (body) and 49.7+/-3.3 microm (cap) with thicker ones and 55.7+/-6.6 microm (body) and 46.8+/-6.2 microm (cap) with thinner ones. HPMCP PCDCs had 28.1+/-3.3 microm (body), 30.9+/-1.0 microm (cap) with thinner ones and 43.1+/-9.8 microm (body), 42.4+/-8.2 microm (cap) with thicker ones. The mean T(i) values, the first appearance time, of FL in the serum of HPMCAS PCDCs were 2.0+/-0.7 h for thicker ones and 3.8+/-0.5 h for thinner ones, while the mean T(i) values of HPMCP PCDCs were 2.0+/-0.0 h for thinner ones and 3.5+/-0.7 h for thicker ones. Since the colon arrival time in beagle dogs was 3.5+/-0.3 h as determined by a sulfasalazine test, thinner HPMCAS PCDCs and thicker HPMCP PCDCs were thought to deliver FL to the colon.
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Affiliation(s)
- Y I Jeong
- Department of Pharmacokinetics, Kyoto Pharmaceutical University, Yamashina-ku, 607-8414, Kyoto, Japan
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Kim IS, Jeong YI, Kim DH, Lee YH, Kim SH. Albumin release from biodegradable hydrogels composed of dextran and poly(ethylene glycol) macromer. Arch Pharm Res 2001; 24:69-73. [PMID: 11235815 DOI: 10.1007/bf02976496] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Biodegradable hydrogels based on glycidyl methacrylate dextran (GMD) and dimethacrylate poly(ethylene glycol) (DMP) were proposed for colon-specific drug delivery. GMD was synthesized by coupling of glycidyl methacrylate with dextran in the presence of 4-(N,N-dimethyl-amino)pyridine (DMAP) using dimethylsulfoxide as a solvent. Methacrylate-terminated poly (ethylene glycol) (PEG) macromer was prepared by the reaction of PEG with methacryloyl chloride. GMD/DMP hydrogels were prepared by radical polymerization of phosphate buffer solution (0.1M, pH 7.4) of GMD and DMP, using ammonium peroxydisulfate (APS) and UV as initiating system. The synthetic GMD, DMP, and GMD/DMP hydrogels were characterized by fourier transform infrared (FT-IR) spectroscopy. The FITC-albumin loaded hydrogels were prepared by adding FITC-albumin solution before UV irradiation. Swelling capacity of GMD/DMP hydrogels was controlled not only by molecular weight of dextran, but also by incorporation ratio of DMP Degradation of the hydrogels has been studied in vitro with dextranase. FITC-albumin release from the GMD/DMP hydrogels was affected by molecular weight of dextran and the presence of dextranase in the release medium.
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Affiliation(s)
- I S Kim
- College of Pharmacy, Chosun University, Kwangju, Korea.
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Abstract
Poly(L-lactic acid)/poly(N-isopropylacrylamide) (abbreviated as LN) block copolymers were synthesized and the LN nanoparticles were prepared by simple diafiltration method. The thermal transition of the LN nanoparticles was at 32.3 degrees C, the lower critical solution temperature (LCST) of the polymer. The fluorescence spectroscopy data showed that LN was self-assembled in water to form core-shell structure nanoparticles, and the critical association concentration (CAC) value was estimated as 1.3x10(-2) g/l. From the transmission electron microscope observations, the LN nanoparticles were spherically shaped and ranged in size between 30 and 50 nm below the LCST. The hydrated size was measured by photon correlation spectroscopy, and reversible size changes were investigated by the factor of temperature. The release of indomethacin from the LN nanoparticles was thermo-sensitive due to the unique characteristic of poly(N-isopropylacrylamide).
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Affiliation(s)
- I S Kim
- College of Pharmacy, Chosun University, #375 Seosuk-dong, Dong-gu, 501-759, Kwangju, South Korea
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Jeon HJ, Jeong YI, Jang MK, Park YH, Nah JW. Effect of solvent on the preparation of surfactant-free poly(DL-lactide-co-glycolide) nanoparticles and norfloxacin release characteristics. Int J Pharm 2000; 207:99-108. [PMID: 11036235 DOI: 10.1016/s0378-5173(00)00537-8] [Citation(s) in RCA: 122] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The surfactant-free nanoparticles of poly(DL-lactide-co-glycolide) (PLGA) were prepared by dialysis method without surfactant and physicochemical properties such as particle size and drug contents were investigated against used initial solvent. The size of PLGA nanoparticles and drug contents were significantly changed by used initial solvent. The size of PLGA nanoparticles prepared from dimethylacetamide (DMAc), dimethylformamide (DMF), and dimethylsulfoxide (DMSO) as a initial used solvent was smaller than that of acetone. Selected initial solvent used to dissolve the copolymer significantly affects the size of nanoparticles and drug contents. It was shown that PLGA nanoparticles have spherical shapes from the results of scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observations. It was thought that surfactant-free nanoparticles of PLGA entrapping norfloxacin (NFX) has nice drug loading capacity without free-drug on the surface of nanoparticles through the analysis of X-ray powder diffraction. From these results, it was showed the potential that the PLGA nanoparticles could be formed successively by dialysis method without surfactant. Release kinetics of NFX used as a model drug was governed by not only drug contents but also particle size parameter. The higher the drug contents and the larger the particle size resulted in slower the drug release.
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Affiliation(s)
- H J Jeon
- Department of Polymer Science and Engineering, Sunchon National University, 540-742, Sunchon, South Korea
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Abstract
Biodegradable hydrogel nanoparticles were prepared from glycidyl methacrylate dextran (GMD) and dimethacrylate poly(ethylene glycol) (DMP). GMD was synthesized by coupling of glycidyl methacrylate to dextran in the presence of 4-(N,N-dimethylamino)pyridine (DMAP) using dimethylsulfoxide (DMSO) as an aprotic solvent. DMP was synthesized from poly(ethylene glycol) (PEG) and methacryloyl chloride. GMD/DMP (abbreviated as DP) hydrogel was prepared by radical polymerization of GMD and DMP using ammonium peroxydisulfate (APS) as an initiator and UV curing. DP hydrogel nanoparticles were obtained by diafiltration method using DMSO solution. The GMD and DMP were characterized by fourier transform infrared spectroscopy. Fluorescence probe technique was used to investigate the self-assembly of DP in water using pyrene as a hydrophobic probe. The critical association concentration (CAC) was determined to be 5.6 x 10(-2) g/l. The shape of DP hydrogel nanoparticles was spherical when observed by transmission electron microscope (TEM). The size range of DP hydrogel nanoparticles was about 20 approximately 50 nm. The hydrodynamic size of DP hydrogel nanoparticles was measured by photon correlation spectroscopy (PCS) and gradually increased with time in PBS (0.1 M, pH 7.4). Drug release study was performed using clonazepam (CNZ) as a hydrophobic model drug. In vitro release rate of CNZ from the DP hydrogel nanoparticles was dependent on the existence of dextranase and the pH of the release medium.
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Affiliation(s)
- I S Kim
- College of Pharmacy, Chosun University, #375 Seosuk-dong, Dong-gu, Kwangju 501-759, South Korea
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Abstract
Cholic acid (CA) was coupled with amine-terminated poly (N-isopropylacrylamide) (ATPNIPAAm) using N,N'-dicyclohexyl carbodiimide as a coupling agent. Self-assembled CA/PNIPAAm conjugate (abbreviated as CN) micelles were prepared by diafiltration method in water. The CN micelles exhibited the lower critical solution temperature (LCST) at 31.5 degrees C. The CN micelles were observed as spherical shapes and their dried sizes were ranged between 30 and 50 nm by the transmission electron microscope (TEM) images. Hydrated micelle sizes measured by photon correlation spectroscopy (PCS) were ranged 337.5+/-67.8 nm. And reversible size changes of CN micelles were observed with two point temperature 10 and 40 degrees C, respectively. From the fluorescence spectra, fluorescence intensity of pyrene in the CN micelles was increased and red-shifted as the concentration of CN increased, indicating the formation of self-assembled polymeric micelles in water. The critical micelle concentration (CMC) was evaluated as 8.9 x 10(-2) g/l. Much more indomethacin (IN) was released from th CN micelles at 10 than at 40 degrees C due to the thermo-sensitivity of the PNIPAAm in the CN polymer.
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Affiliation(s)
- I S Kim
- College of Pharmacy, Chosun University, #375 Seosuk-Dong, Dong-Gu, Kwangju 501-759, South Korea
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Kim IS, Jeong YI, Lee YH, Kim SH. Drug release from thermo-responsive self-assembled polymeric micelles composed of cholic acid and poly(N-isopropylacrylamide). Arch Pharm Res 2000; 23:367-73. [PMID: 10976585 DOI: 10.1007/bf02975449] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Cholic acid, conjugated with amine-terminated poly(N-isopropylacrylamide) (abbreviated as CA/ATPNIPAAm), was synthesized by a N, N'-dicyclohexyl carbodiimide (DCC)-mediated coupling reaction. Self-assembled CA/ATPNIPAAm micelles were prepared by a diafiltration method in aqueous media. The CA/ATPNIPAAm micelles exhibited a lower critical solution temperature (LCST) at 31.5 degrees C. Micelle sizes measured by photon correlation spectroscopy (PCS) were approximately 31.6+/-5.8 nm. The CA/ATPNIPAAm micelles were spherical and their thermal size transition was observed by transmission electron microscope (TEM). A fluorescence probe technique was used for determining the micelle formation behavior of CA/ATPNIPAAm in aqueous solutions using pyrene as a hydrophobic probe. The critical micelle concentration (CMC) was evaluated as 8.9 x 10(-2) g/L. A drug release study was performed using indomethacin (IN) as a hydrophobic model drug. The release kinetics of IN from the CA/ATPNIPAAm micelles revealed a thermo-sensitivity by the unique character of poly(N-isopropylacrylamide) i.e. the release rate was higher at 25 degrees C than at 37 degrees C.
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Affiliation(s)
- I S Kim
- College of Pharmacy, Chosun University, Kwangju, Korea
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Ryu J, Jeong YI, Kim IS, Lee JH, Nah JW, Kim SH. Clonazepam release from core-shell type nanoparticles of poly(epsilon-caprolactone)/poly(ethylene glycol)/poly(epsilon-caprolactone) triblock copolymers. Int J Pharm 2000; 200:231-42. [PMID: 10867253 DOI: 10.1016/s0378-5173(00)00392-6] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The triblock copolymer based on poly(epsilon-caprolactone) (PCL) as hydrophobic part and poly(ethylene glycol) (PEG) as hydrophilic one was synthesized and characterized. Core-shell type nanoparticles of poly(epsilon-caprolactone)/poly(ethylene glycol)/poly(epsilon-caprolactone) (CEC) block copolymer were prepared by a dialysis technique. According to the amphiphilic characters, CEC block copolymer can self-associate at certain concentration and their critical association concentration (CAC) was determined by fluorescence probe technique. CAC value of the CEC-2 block copolymer was evaluated as 0.0030 g/l. CAC values of CEC block copolymer decreased with the increase of PCL chain length, i.e. the shorter the PCL chain length, the higher the CAC values. From the observation of transmission electron microscopy (TEM), the morphologies of CEC-2 core-shell type nanoparticles were spherical shapes. Particle size of CEC-2 nanoparticles was 32.3+/-17.3 nm as a monomodal and narrow distribution. Particle size, drug loading, and drug release rate of CEC-2 nanoparticles were changed by the initial solvents and the molecular weight of CEC. The degradation behavior of CEC-2 nanoparticles was observed by 1H NMR spectroscopy. It was suggested that clonazepam (CNZ) release kinetics were dominantly governed by diffusion mechanism.
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Affiliation(s)
- J Ryu
- College of Pharmacy, Chosun University, #375 Seosuk-Dong, Dong-Gu, 501-759, Kwangju, South Korea
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Affiliation(s)
- I S Kim
- College of Pharmacy, Chosun University, Kwangju, Korea
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Jeong YI, Nah JW, Lee HC, Kim SH, Cho CS. Adriamycin release from flower-type polymeric micelle based on star-block copolymer composed of poly(gamma-benzyl L-glutamate) as the hydrophobic part and poly(ethylene oxide) as the hydrophilic part. Int J Pharm 1999; 188:49-58. [PMID: 10528082 DOI: 10.1016/s0378-5173(99)00202-1] [Citation(s) in RCA: 91] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Star-block copolymer based on PBLG as the hydrophobic part and PEO as the hydrophilic one (as abbreviated GEG) was synthesized and characterized. Polymeric micelle was prepared by the diafiltration method. From the measurement of photon correlation spectroscopy, the nanoparticle sizes of GEG-1, GEG-2 and GEG-3 were 106.5+/-59.2, 43.8+/-0.7 and 13.5+/-1.0 nm in number average, respectively, indicating of the formation of polymeric micelle. Also, the nanoparticle sizes were dependent on the PBLG chain length, i.e. the more PBLG content in the copolymer, the larger the particle size. From the observation of transmission electron microscope(TEM), GEG-2 block copolymer had almost spherical shapes with size range about 20-70 nm, that was similar to particle size measurement. Fluorescence spectroscopy measurement indicated that GEG block copolymers associated in water to form polymeric micelles and critical micelle concentration (CMC) values of the block copolymers decreased with increasing PBLG chain length in the block copolymer. Characteristic peaks of the protons of the benzyl group in the PBLG and the methylene protons adjacent to the benzyl group of the PBLG segment in the GEG-2 nanoparticles appeared in 7.2 approximately 7.4 and 5.0 approximately 5.2 ppm, respectively, and disappeared in D(2)O, indicating the restricted motions of these protons within the micellar core and the very rigid structure of the PBLG core in the GEG polymeric micelles. Release of ADR from the polymeric micelles in vitro was slower in longer PBLG chain length and higher loading contents of ADR.
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Affiliation(s)
- Y I Jeong
- Department of Polymer Engineering, Chonnam National University, Kwangju, South Korea
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Abstract
In this report, we have prepared self-assembling nanospheres of hydrophobized pullulans. Pullulan acetate as a hydrophobized pullulan was synthesized by acetylation of pullulan and characterized by Fourier transform infrared (FTIR) measurement. From the results of photon correlation spectroscopy (PCS), hydrophobized pullulans could be self-assembled in water as nanospherical aggregates, and their number-average particle size was 74.3 +/- 38.2 nm with a unimodal distribution. Also, morphological studies observed by transmission electron microscopy (TEM) showed that self-assembly of hydrophobized pullulans results in nice spherical shapes with a size range of about 50-100 nm, which was in accordance with PCS measurements. Their size and morphology have acceptable properties for intravenous injectable drug-targeting carriers. The fluorescence probe technique was used for self-association of hydrophobized pullulans in water using pyrene as a hydrophobic probe. From the fluorescence measurement, the fluorescence intensity of pyrene increased with increasing concentration of hydrophobized pullulans, which indicates self-assembly formation of hydrophobized pullulans in water. Also, in the fluorescence excitation spectrum, a red shift was observed with increasing concentration of hydrophobized pullulans. These results also revealed that hydrophobized pullulans could be self-assembled in water, and from the plot of I337/I334 versus log c of hydrophobized pullulans, the critical association concentration was 0.0022 g/l, which was considerably lower than that of low molecular weight surfactants or poloxamer. A drug loading study was performed using clonazepam (CNZ) as a hydrophobic model drug. We observed that the higher the feeding amount of drug was, the more the drug loading contents were, the lower the drug loading efficiency was, and the larger the particle size was. CNZ was released from nanospheres via pseudo-zero-order kinetics, and the increased drug loading contents led to slower release of the drug.
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Affiliation(s)
- Y I Jeong
- Department of Polymer Engineering, Chonnam National University, Kwangju, Korea
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Nah JW, Paek YW, Jeong YI, Kim DW, Cho CS, Kim SH, Kim MY. Clonazepam release from poly(DL-lactide-co-glycolide) nanoparticles prepared by dialysis method. Arch Pharm Res 1998; 21:418-22. [PMID: 9875469 DOI: 10.1007/bf02974636] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Aim of this work is to prepare poly(DL-lactide-co-glycolide) (PLGA) nanoparticles by dialysis method without surfactant and to investigate drug loading capacity and drug release. The size of PLGA nanoparticles was 269.9 +/- 118.7 nm in intensity average and the morphology of PLGA nanoparticles was spherical shape from the observation of SEM and TEM. In the effect of drug loading contents on the particle size distribution, PLGA nanoparticles were monomodal pattern with narrow size distribution in the empty and lower drug loading nanoparticles whereas bi- or trimodal pattern was showed in the higher drug loading ones. Release of clonazepam from PLGA nanoparticles with higher drug loading contents was slower than that with lower loading contents.
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Affiliation(s)
- J W Nah
- Department of Polymer Science and Engineering, Sunchon National University, Chonnam, Korea
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Abstract
Block copolymers consisting of poly(gamma-benzyl L-glutamate) (PBLG) as the hydrophobic block and poly(ethylene oxide) (PEO) as the hydrophilic block were synthesized and characterized. Core-shell type nanoparticles of the block copolymers (abbreviated as GE) were prepared by the diafiltration method. The particle size diameter obtained by dynamic light scattering of GE-1 (PBLG content: 60.5 mol%), GE-2 (PBLG content: 40.0 mol %), GE-3 (PBLG content: 124.4 mol %) copolymer was 309.9 +/- 160.9, 251.9 +/- 220.6 and 200.5 +/- 177.1nm, respectively. The shape of the nanoparticles by SEM or TEM was almost spherical. The critical micelle concentration of the block copolymers obtained by fluorescence spectroscopy was dependent on the chain length of hydrophobic PBLG. The micelle structure of the copolymers nanoparticle was very stable against sodium dodecyl sulfate. Clonazepam (CZ) was loaded onto the core part of the nanoparticle as the crystalline state. Release of CZ from the nanoparticles in vitro was dependent on the drug loading contents and PBLG chain length.
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Affiliation(s)
- Y I Jeong
- Department of Polymer Engineering, Chonnam National University, Kwangju, Korea
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Cho CS, Jeong YI, Ishihara T, Takei R, Park JU, Park KH, Maruyama A, Akaike T. Simple preparation of nanoparticles coated with carbohydrate-carrying polymers. Biomaterials 1997; 18:323-6. [PMID: 9068894 DOI: 10.1016/s0142-9612(96)00138-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Nanoparticles bearing carbohydrate chains on the surface can be prepared by the simple diafiltration method. The nanoparticles prepared by the present method displayed high yield, no-aggregation formation, small size, narrow size distribution, and one-step procedure. Also, the high density carbohydrate chains on the particles can be recognized by liver cells.
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Affiliation(s)
- C S Cho
- Department of Polymer Engineering, Chonnam National University, Kwangju, Korea
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Lee AJ, Kim SH, Seong YH, Yoo SA, Kwon IG, Jeong YI, Nam HK, Kwon EJ. [A clinical study for promoting quality nursing care in a university hospital]. Taehan Kanho 1993; 32:66-77. [PMID: 8127047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The purpose of this study was to develop a new nursing unit which can meet changing health care needs, enhance patients' satisfaction and nurses' job satisfaction, and finally guarantee quality nursing care with present manpower. For this, one medical unit was selected as a unit for quality care. And one medical unit which is similar in staffing and patients' characteristics was selected as a control unit. To assess present problems and identify the remedies to the problems a hospital-wide survey and a workshop were performed. According to the survey results, educational programs and improvement of the facilities and equipment supply system, managerial support for interdepartmental cooperation and intensification of bed-side nursing care were adopted as main principles for operating model unit. This model unit was operated for 3 months from Sep. 1, 1992 to Nov. 30, 1992. To evaluate the effectiveness of the model unit, direct/indirect nursing care hours, patients' satisfaction to nursing care, nurses' job satisfaction, and quality care index were measured. Direct/indirect nursing care hours were compared with that of the control unit, and patients' and nurses' satisfaction and quality care index were measured before and after operating model unit and compared with each other. The results of the study were as follows; 1. In the model unit mean direct nursing care hours per each shift was 146.88 minutes and indirect nursing care hours was 354.72 minutes. The ratio of the direct nursing care hour to indirect nursing hour was 29.6:70.4 and that of the control unit was 26.9:73.1. Direct nursing care hour in model unit was longer than that of the control unit. But, the difference was not significant. In subcategories of direct nursing care, the time spent in mobility and exercise, conservation of body temperature, hygiene, and communication and health education were longer than that of the control unit. 2. Indirect nursing care hour in model unit was shorter than that of the control unit. But, the difference was not significant. In subcategories of indirect nursing care, the time spent in drug management and ward arrangement was shorter than that of the control unit. 3. Patients' satisfaction to nursing care was increased significantly after operating the model unit (T = -3.48, P = 0.002) and satisfaction to subcategories of physical comfort measure, psychological care, and unit management components were significantly higher than before.(ABSTRACT TRUNCATED AT 400 WORDS)
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