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Li C, Li Y, Zeng Q, Zhou Y, Su H, Han Y, Li C. Celastrol nano-emulsions selectively regulate apoptosis of synovial macrophage for alleviating rheumatoid arthritis. J Drug Target 2024:1-29. [PMID: 38712874 DOI: 10.1080/1061186x.2024.2352757] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Accepted: 04/18/2024] [Indexed: 05/08/2024]
Abstract
Rheumatoid arthritis (RA) is a chronic autoimmune inflammation. Excessive proliferation and inadequate apoptosis of synovial macrophages are the crucial events of RA. Therefore, delivering therapeutic molecules to synovial macrophages specifically to tackle apoptotic insufficiency probably be an efficient way to reduce joint inflammation and bone erosion. Based on the characteristics of dextran sulfate (DS) specifically binding scavenger receptor A (SR-A) on macrophage and celastrol (CLT) inducing apoptosis, we designed synovial macrophage-targeted nano-emulsions encapsulated with CLT (SR-CLTNEs) and explored their anti-RA effect. After intravenous injection, fluorescence-labeled SR-CLTNEs successfully targeted inflammatory joints and synovial macrophages in a mouse model of RA, with the macrophage targeting efficiency of SR-CLTNEs, CLTNEs, and Free DID was 20.53%, 13.93%, and 9.8%, respectively. In vivo and in vitro studies showed that SR-CLTNEs effectively promoted the apoptosis of macrophages, reshaped the balance between apoptosis and proliferation, and ultimately treated RA in a high efficiency and low toxicity manner. Overall, our work demonstrates the efficacy of using SR-CLTNEs as a novel nanotherapeutic approach for RA therapy and the great translational potential of SR-CLTNEs.
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Affiliation(s)
- Chenglong Li
- Department of Pharmacy, Deyang People's Hospital, Affiliated Hospital of Chengdu University of traditional Chinese Medicine, Deyang 618000, China
- Sichuan Clinical Medical Research Center for Neurological Diseases, Deyang People's Hospital, Affiliated Hospital of Chengdu University of traditional Chinese Medicine, Deyang 618000, China
| | - Yan Li
- Operating Room, Deyang People's Hospital, Affiliated Hospital of Chengdu University of traditional Chinese Medicine, Deyang 618000, China
| | - Qing Zeng
- Department of Pharmacy, Deyang People's Hospital, Affiliated Hospital of Chengdu University of traditional Chinese Medicine, Deyang 618000, China
| | - Yang Zhou
- Department of Scientific & Education, Deyang People's Hospital, Affiliated Hospital of Chengdu University of traditional Chinese Medicine, Deyang 618000, P.R. China
| | - Huaiyu Su
- Department of Pharmacy, Deyang People's Hospital, Affiliated Hospital of Chengdu University of traditional Chinese Medicine, Deyang 618000, China
| | - Yangyun Han
- Sichuan Clinical Medical Research Center for Neurological Diseases, Deyang People's Hospital, Affiliated Hospital of Chengdu University of traditional Chinese Medicine, Deyang 618000, China
- Department of Neurosurgery, Deyang People's Hospital, Affiliated Hospital of Chengdu University of traditional Chinese Medicine, Deyang 618000, P.R. China
| | - Chen Li
- Centre for Translational Research in Cancer, Sichuan Cancer Hospital & Institute, Chengdu 610000, China
- School of Medicine, University of Electronic Science and Technology, Chengdu 610000, China
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Hong SE, Lee JS, Lee HG. α-Tocopherol-loaded multi-layer nanoemulsion using chitosan, and dextran sulfate: Cellular uptake, antioxidant activity, and in vitro bioaccessibility. Int J Biol Macromol 2024; 254:127819. [PMID: 37918612 DOI: 10.1016/j.ijbiomac.2023.127819] [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: 05/01/2023] [Revised: 09/12/2023] [Accepted: 10/30/2023] [Indexed: 11/04/2023]
Abstract
The potential of multi-layer nanoemulsions (NEs) for improving the cellular uptake, antioxidant activity, and in vitro bioaccessibility of α-tocopherol (ToC) was examined. ToC-loaded multi-layer NEs were prepared using lecithin (primary-NEs, P-NEs), chitosan (secondary-NEs, S-NEs), and dextran sulfate (tertiary-NEs, T-NEs) as wall materials. The bioadhesion, cellular permeability, and uptake of the multi-layer NEs were significantly higher than that of the free coumarin 6 (C6). As a result of cellular uptake, the mean fluorescence intensity of T-NEs was the highest among the three types of multi-layer NEs and was 9.8-fold higher than that of free C6. The cellular antioxidant abilities of P-NEs, S-NEs, and T-NEs were 40, 45, and 50 %, respectively. Multi-layer nanoencapsulation sustains free fatty acid release after digestion. Moreover, the bioavailability of T-NEs exhibited a two-fold increase compared with that of the free ToC. These findings indicate that by multi-layer NEs using a layer-by-layer method, the cellular uptake, in vitro bioaccessibility, and antioxidant activity of ToC can be improved. Furthermore, T-NEs using chitosan and dextran sulfate can potentially enhance the cellular uptake, in vitro bioaccessibility, and antioxidant activity of ToC. These findings would facilitate the application of multi-layer NEs for lipophilic bioactive compounds using biopolymers.
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Affiliation(s)
- Seong Eun Hong
- Department of Food and Nutrition, Hanyang University, 222, Wangsimni-ro, Seoungdong-gu, Seoul 04763, Republic of Korea
| | - Ji-Soo Lee
- Department of Food and Nutrition, Hanyang University, 222, Wangsimni-ro, Seoungdong-gu, Seoul 04763, Republic of Korea; Medicine Park, Co., Ltd, A-609, 406 Teheran-ro, Gangnam-gu, Seoul 06192, Republic of Korea
| | - Hyeon Gyu Lee
- Department of Food and Nutrition, Hanyang University, 222, Wangsimni-ro, Seoungdong-gu, Seoul 04763, Republic of Korea.
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3
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Dahmana N, Destruel PL, Facchetti S, Braun V, Lebouc V, Marin Z, Patel S, Schwach G. Reversible protein complexes as a promising avenue for the development of high concentration formulations of biologics. Int J Pharm 2023; 648:123616. [PMID: 37977291 DOI: 10.1016/j.ijpharm.2023.123616] [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: 09/05/2023] [Revised: 11/13/2023] [Accepted: 11/15/2023] [Indexed: 11/19/2023]
Abstract
High concentration formulations have become an important pre-requisite in the development of biological drugs, particularly in the case of subcutaneous administration where limited injection volume negatively affects the administered dose. In this study, we propose to develop high concentration formulations of biologics using a reversible protein-polyelectrolyte complex (RPC) approach. First, the versatility of RPC was assessed using different complexing agents and formats of therapeutic proteins, to define the optimal conditions for complexation and dissociation of the complex. The stability of the protein was investigated before and after complexation, as well as upon a 4-week storage period at various temperatures. Subsequently, two approaches were selected to develop high concentration RPC formulations: first, using up-concentrated RPC suspensions in aqueous buffers, and second, by generating spray-dried RPC and further resuspension in non-aqueous solvents. Results showed that the RPC concept is applicable to a wide range of therapeutic protein formats and the complexation-dissociation process did not affect the stability of the proteins. High concentration formulations up to 200 mg/mL could be achieved by up-concentrating RPC suspensions in aqueous buffers and RPC suspensions in non-aqueous solvents were concentrated up to 250 mg/mL. Although optimization is needed, our data suggests that RPC may be a promising avenue to achieve high concentration formulations of biologics for subcutaneous administration.
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Affiliation(s)
- Naoual Dahmana
- Pharmaceutical Development & Supplies, PTD Biologics Europe, F. Hoffmann-La Roche Ltd, CH-4070 Basel, Switzerland; Department of Pharmaceutical Sciences, University of Basel, Basel, Switzerland
| | - Pierre-Louis Destruel
- Pharmaceutical Development & Supplies, PTD Biologics Europe, F. Hoffmann-La Roche Ltd, CH-4070 Basel, Switzerland.
| | - Samantha Facchetti
- Pharmaceutical Development & Supplies, PTD Biologics Europe, F. Hoffmann-La Roche Ltd, CH-4070 Basel, Switzerland
| | - Vanessa Braun
- Pharmaceutical Development & Supplies, PTD Biologics Europe, F. Hoffmann-La Roche Ltd, CH-4070 Basel, Switzerland
| | - Vanessa Lebouc
- Pharmaceutical Development & Supplies, PTD Biologics Europe, F. Hoffmann-La Roche Ltd, CH-4070 Basel, Switzerland
| | - Zana Marin
- Pharmaceutical Development & Supplies, PTD Biologics Europe, F. Hoffmann-La Roche Ltd, CH-4070 Basel, Switzerland
| | - Sulabh Patel
- Pharmaceutical Development & Supplies, PTD Biologics Europe, F. Hoffmann-La Roche Ltd, CH-4070 Basel, Switzerland
| | - Gregoire Schwach
- Pharmaceutical Development & Supplies, PTD Biologics Europe, F. Hoffmann-La Roche Ltd, CH-4070 Basel, Switzerland
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4
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Yin Q, Wu L, Zhang X, Zheng Z, Luo S, Zhong X, Zhao Y. Preparation of high complex concentration emulsion stabilized by soy protein/ dextran sulfate composite particles. J Sci Food Agric 2023. [PMID: 37185886 DOI: 10.1002/jsfa.12663] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Revised: 04/13/2023] [Accepted: 04/21/2023] [Indexed: 05/17/2023]
Abstract
BACKGROUND Soy protein isolate (SPI) could be used as an emulsifier to stabilize emulsions, while SPI is unstable under low acidic conditions. The stable composite particles of SPI and dextran sulfate (DS) could be formed by the electrostatic interaction at the pH was 3.5. And the SPI/DS composite particles were used to prepare the high complex concentration emulsion. The stabilization properties of high complex concentration emulsion were investigated. RESULTS Compared to uncompounded SPI, the particle size of SPI/DS composite particles was smaller at 1.52 μm, and the absolute value of the potential increased to 19.9 mV when the mass ratio of SPI to DS was 1:1 and the pH was 3.5. With the DS ratio increased, the solubility of the composite particles increased to 14.44 times of the untreated protein at pH 3.5, while the surface hydrophobicity decreased. Electrostatic interactions and hydrogen bonds were the main forces between SPI and DS, and DS was electrostatically adsorbed on the surface of SPI. The emulsion stability significantly enhanced with the increase of complex concentration (38.88 times higher than at 1% concentration), the emulsion average droplet size was the lowest (9.64 μm), and the absolute value of potential was the highest (46.67 mV) when the mass ratio of SPI to DS was 1:1 and the complex concentration of 8%. The stability of the emulsion against freezing was improved. CONCLUSION The SPI/DS complex has high solubility and stability under low acidic conditions, and the SPI/DS complex' emulsion has a well stability. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Qi Yin
- School of Food and Biological Engineering, The Key Laboratory for Agricultural Products Processing of Anhui Province, Hefei University of Technology, Hefei, 230601, China
| | - Liang Wu
- School of Food and Biological Engineering, The Key Laboratory for Agricultural Products Processing of Anhui Province, Hefei University of Technology, Hefei, 230601, China
| | - Xinli Zhang
- School of Food and Biological Engineering, The Key Laboratory for Agricultural Products Processing of Anhui Province, Hefei University of Technology, Hefei, 230601, China
| | - Zhi Zheng
- School of Food and Biological Engineering, The Key Laboratory for Agricultural Products Processing of Anhui Province, Hefei University of Technology, Hefei, 230601, China
| | - Shuizhong Luo
- School of Food and Biological Engineering, The Key Laboratory for Agricultural Products Processing of Anhui Province, Hefei University of Technology, Hefei, 230601, China
| | - Xiyang Zhong
- School of Food and Biological Engineering, The Key Laboratory for Agricultural Products Processing of Anhui Province, Hefei University of Technology, Hefei, 230601, China
| | - Yanyan Zhao
- School of Food and Biological Engineering, The Key Laboratory for Agricultural Products Processing of Anhui Province, Hefei University of Technology, Hefei, 230601, China
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5
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Yaoita E. Restoration of Podocyte Phenotype in Culture. Methods Mol Biol 2023; 2664:3-12. [PMID: 37423978 DOI: 10.1007/978-1-0716-3179-9_1] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/11/2023]
Abstract
The most distinctive characteristic of podocytes in the kidney is the presence of interdigitating cell processes with nephrin and podocin that are concentrated at sites of cell-cell contact. Unfortunately, these defining features are easily lost in culture. We previously reported culture conditions that can restore the differentiated phenotypes in primary cultures of rat podocyte. Since then, some of the materials used have been discontinued or improved. In this chapter, we therefore provide our most recent protocol for the restoration of the podocyte phenotype in culture.
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Affiliation(s)
- Eishin Yaoita
- Kidney Research Center, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan.
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Park K, Ahn JW, Kim JH, Kim JW. Tumor-associated macrophage-targeted photodynamic cancer therapy using a dextran sulfate-based nano-photosensitizer. Int J Biol Macromol 2022; 218:384-393. [PMID: 35902009 DOI: 10.1016/j.ijbiomac.2022.07.159] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [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: 05/15/2022] [Revised: 07/12/2022] [Accepted: 07/20/2022] [Indexed: 11/19/2022]
Abstract
The M2-like phenotype of tumor-associated macrophages (TAMs) present in tumors promotes tumor growth and metastasis. Therefore, targeting M2-like TAMs is a potential strategy for cancer therapy. Herein, we fabricated a dextran sulfate-based nano-photosensitizer (dextran sulfate-conjugated chlorin e6, DS-Ce6) to specifically target M2-like TAMs for enhanced photodynamic therapy (PDT). DS-Ce6 was preferentially taken up by interleukin-4-derived M2 macrophages, which overexpressed scavenger receptor-A and selectively targeted macrophages in co-cultured 4T1 tumors/macrophages. The nano-photosensitizer also effectively induced the apoptosis of tumor cells in both monolayer co-culture and three-dimensional co-culture spheroids of tumors/macrophages under laser irradiation. Moreover, the nano-photosensitizer specifically targeted F4/80 and CD206 double-positive M2-like TAMs within tumor tissues. Therefore, the specifically targeted delivery of DS-Ce6 to M2-like TAMs prominently induced tumor apoptosis, leading to excellent phototherapeutic effects in 4T1 tumor-bearing mice after PDT, suggesting the potential of DS-Ce6 for specific targeting of M2-like TAMs and enhanced PDT.
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Affiliation(s)
- Kyeongsoon Park
- Department of Systems Biotechnology, Chung-Ang University, Anseong, Gyeonggi 17546, Republic of Korea.
| | - Jae Won Ahn
- Department of Systems Biotechnology, Chung-Ang University, Anseong, Gyeonggi 17546, Republic of Korea
| | - Jin Hyuk Kim
- Multimodal Imaging and Theranostic Laboratory, Cardiovascular Center, Korea University Guro Hospital, 148 Gurodong-ro, Guro-gu, Seoul 08308, Republic of Korea
| | - Jin Won Kim
- Multimodal Imaging and Theranostic Laboratory, Cardiovascular Center, Korea University Guro Hospital, 148 Gurodong-ro, Guro-gu, Seoul 08308, Republic of Korea
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Feng C, Pan L, Qin X, Li D, Chen T, Lin Z, Li G, Wang Q. Inflammation-homing "living drug depot" for efficient arthritis treatment. Acta Biomater 2022; 150:324-336. [PMID: 35840107 DOI: 10.1016/j.actbio.2022.07.013] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 06/29/2022] [Accepted: 07/06/2022] [Indexed: 11/28/2022]
Abstract
Delivering therapeutic agents efficiently to inflamed joints remains an intractable problem in rheumatoid arthritis (RA) treatment due to the complicated physiological barriers. Circulating monocytes could selectively migrate to inflamed sites and differentiate into resident macrophages to aggravate RA. Therefore, a drug carrier that can be specifically internalized by circulating monocytes and switch monocytes into anti-inflammatory phenotype when reaching inflamed sites, might bypass the in vivo physiological barriers and achieve efficient RA therapy. Herein, we design a dextran sulfate (DS) functionalized nanoparticle (ZDNP) to selectively deliver anti-inflammatory agent dexamethasone (Dex) to circulating monocytes via the scavenger receptors on monocytes. Monocytes engulfing drug-loaded ZDNP could subsequently home to arthritic joints and act as a "living drug depot" to combat RA. Results revealed that ZDNP could be preferentially internalized by circulating monocytes when intravenously administrated in vivo. In a rat arthritic model, we found that circulating monocytes remarkably facilitated drug distribution and retention in inflamed joints. Moreover, monocytes engulfing drug-loaded nanoparticles exhibited favorable anti-inflammatory ability and M2-biased differentiation. Our work offers a facile approach to achieve site-directed anti-inflammatory therapy by taking advantage of the inflammation-homing ability of circulating monocytes. STATEMENT OF SIGNIFICANCE: Circulating monocytes can migrate to inflamed sites and then differentiate into macrophages to aggravate arthritis. Therefore, a drug carrier that can be specifically internalized by circulating monocytes and switch monocytes into anti-inflammatory phenotype when reaching inflamed sites may achieve efficient arthritis therapy. Here, we designed a monocyte-targeting nanoparticle (ZDNP) to selectively deliver anti-inflammatory Dex to circulating monocytes. When injected intravenously, ZDNP was effectively internalized by circulating monocytes via a scavenger receptor and subsequently was transported to arthritic joints, where monocytes engulfing the drug-loaded nanoparticles could switch to an anti-inflammatory phenotype to inhibit arthritis progress. We provide detailed evidence about the in vivo fate of ZDNP and unravel how monocytes act as a "living drug depot" to achieve site-directed arthritis therapy.
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Affiliation(s)
- Chenglan Feng
- Key Laboratory of Advanced Technologies of Materials, Ministry of Education and School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
| | - Lihua Pan
- Key Laboratory of Advanced Technologies of Materials, Ministry of Education and School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
| | - Xianyan Qin
- Key Laboratory of Advanced Technologies of Materials, Ministry of Education and School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
| | - Daming Li
- Key Laboratory of Advanced Technologies of Materials, Ministry of Education and School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
| | - Tao Chen
- Key Laboratory of Advanced Technologies of Materials, Ministry of Education and School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
| | - Zhicong Lin
- Key Laboratory of Advanced Technologies of Materials, Ministry of Education and School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
| | - Guojiao Li
- Key Laboratory of Advanced Technologies of Materials, Ministry of Education and School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
| | - Qin Wang
- Key Laboratory of Advanced Technologies of Materials, Ministry of Education and School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China.
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Wu H, Tang X, Wang Y, Wang N, Chen Q, Xie J, Liu S, Zhong Z, Qiu Y, Situ P, Zern MA, Wang J, Chen H, Duan Y. Dextran sulfate prevents excess aggregation of human pluripotent stem cells in 3D culture by inhibiting ICAM1 expression coupled with down-regulating E-cadherin through activating the Wnt signaling pathway. Stem Cell Res Ther 2022; 13:218. [PMID: 35619172 PMCID: PMC9137216 DOI: 10.1186/s13287-022-02890-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Accepted: 04/25/2022] [Indexed: 11/29/2022] Open
Abstract
Background Human pluripotent stem cells (hPSCs) have great potential in applications for regenerative medicine and drug development. However, 3D suspension culture systems for clinical-grade hPSC large-scale production have been a major challenge. Accumulating evidence has demonstrated that the addition of dextran sulfate (DS) could prevent excessive adhesion of hPSCs from forming larger aggregates in 3D suspension culture. However, the signaling and molecular mechanisms underlying this phenomenon remain elusive. Methods By using a cell aggregate culture assay and separating big and small aggregates in suspension culture systems, the potential mechanism and downstream target genes of DS were investigated by mRNA sequence analysis, qRT-PCR validation, colony formation assay, and interference assay. Results Since cellular adhesion molecules (CAMs) play important roles in hPSC adhesion and aggregation, we assumed that DS might prevent excess adhesion through affecting the expression of CAMs in hPSCs. As expected, after DS treatment, we found that the expression of CAMs was significantly down-regulated, especially E-cadherin (E-cad) and intercellular adhesion molecule 1 (ICAM1), two highly expressed CAMs in hPSCs. The role of E-cad in the adhesion of hPSCs has been widely investigated, but the function of ICAM1 in hPSCs is hardly understood. In the present study, we demonstrated that ICAM1 exhibited the capacity to promote the adhesion in hPSCs, and this adhesion was suppressed by the treatment with DS. Furthermore, transcriptomic analysis of RNA-seq revealed that DS treatment up-regulated genes related to Wnt signaling resulting in the activation of Wnt signaling in which SLUG, TWIST, and MMP3/7 were highly expressed, and further inhibited the expression of E-cad. Conclusion Our results demonstrated that DS played an important role in controlling the size of hPSC aggregates in 3D suspension culture by inhibiting the expression of ICAM1 coupled with the down-regulation of E-cad through the activation of the Wnt signaling pathway. These results represent a significant step toward developing the expansion of hPSCs under 3D suspension condition in large-scale cultures. Supplementary Information The online version contains supplementary material available at 10.1186/s13287-022-02890-4.
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Affiliation(s)
- Haibin Wu
- Laboratory of Stem Cells and Translational Medicine, Institutes for Life Sciences, School of Medicine, South China University of Technology, No. 382 Waihuan East Road, Suite 406, Higher Education Mega Center, Guangzhou, 510006, People's Republic of China
| | - Xianglian Tang
- Laboratory of Stem Cells and Translational Medicine, Institutes for Life Sciences, School of Medicine, South China University of Technology, No. 382 Waihuan East Road, Suite 406, Higher Education Mega Center, Guangzhou, 510006, People's Republic of China.,School of Biomedical Sciences and Engineering, South China University of Technology, Guangzhou International Campus, Guangzhou, 510180, People's Republic of China.,Guangxi Key Laboratory of Reproductive Health and Birth Defects Prevention, Guangxi Health Commission Key Laboratory of Precise Diagnosis and Treatment of Genetic Diseases, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, Nanning, 530003, Guangxi, People's Republic of China.,Genetic and Metabolic Central Laboratory, Guangxi Birth Defects Research and Prevention Institute, Nanning, 530003, Guangxi, People's Republic of China
| | - Yiyu Wang
- Laboratory of Stem Cells and Translational Medicine, Institutes for Life Sciences, School of Medicine, South China University of Technology, No. 382 Waihuan East Road, Suite 406, Higher Education Mega Center, Guangzhou, 510006, People's Republic of China
| | - Ning Wang
- Laboratory of Stem Cells and Translational Medicine, Institutes for Life Sciences, School of Medicine, South China University of Technology, No. 382 Waihuan East Road, Suite 406, Higher Education Mega Center, Guangzhou, 510006, People's Republic of China.,School of Biomedical Sciences and Engineering, South China University of Technology, Guangzhou International Campus, Guangzhou, 510180, People's Republic of China
| | - Qicong Chen
- Laboratory of Stem Cells and Translational Medicine, Institutes for Life Sciences, School of Medicine, South China University of Technology, No. 382 Waihuan East Road, Suite 406, Higher Education Mega Center, Guangzhou, 510006, People's Republic of China.,School of Biomedical Sciences and Engineering, South China University of Technology, Guangzhou International Campus, Guangzhou, 510180, People's Republic of China
| | - Jinghe Xie
- Laboratory of Stem Cells and Translational Medicine, Institutes for Life Sciences, School of Medicine, South China University of Technology, No. 382 Waihuan East Road, Suite 406, Higher Education Mega Center, Guangzhou, 510006, People's Republic of China.,School of Biomedical Sciences and Engineering, South China University of Technology, Guangzhou International Campus, Guangzhou, 510180, People's Republic of China
| | - Shoupei Liu
- Laboratory of Stem Cells and Translational Medicine, Institutes for Life Sciences, School of Medicine, South China University of Technology, No. 382 Waihuan East Road, Suite 406, Higher Education Mega Center, Guangzhou, 510006, People's Republic of China
| | - Zhiyong Zhong
- Laboratory of Stem Cells and Translational Medicine, Institutes for Life Sciences, School of Medicine, South China University of Technology, No. 382 Waihuan East Road, Suite 406, Higher Education Mega Center, Guangzhou, 510006, People's Republic of China.,School of Biomedical Sciences and Engineering, South China University of Technology, Guangzhou International Campus, Guangzhou, 510180, People's Republic of China
| | - Yaqi Qiu
- Laboratory of Stem Cells and Translational Medicine, Institutes for Life Sciences, School of Medicine, South China University of Technology, No. 382 Waihuan East Road, Suite 406, Higher Education Mega Center, Guangzhou, 510006, People's Republic of China
| | - Ping Situ
- Laboratory of Stem Cells and Translational Medicine, Institutes for Life Sciences, School of Medicine, South China University of Technology, No. 382 Waihuan East Road, Suite 406, Higher Education Mega Center, Guangzhou, 510006, People's Republic of China.,School of Biomedical Sciences and Engineering, South China University of Technology, Guangzhou International Campus, Guangzhou, 510180, People's Republic of China
| | - Mark A Zern
- Department of Internal Medicine, University of California Davis Medical Center, Sacramento, CA, 95817, USA
| | - Jue Wang
- Laboratory of Stem Cells and Translational Medicine, Institutes for Life Sciences, School of Medicine, South China University of Technology, No. 382 Waihuan East Road, Suite 406, Higher Education Mega Center, Guangzhou, 510006, People's Republic of China.
| | - Honglin Chen
- Laboratory of Stem Cells and Translational Medicine, Institutes for Life Sciences, School of Medicine, South China University of Technology, No. 382 Waihuan East Road, Suite 406, Higher Education Mega Center, Guangzhou, 510006, People's Republic of China. .,National Engineering Research Center for Tissue Restoration and Reconstruction, South China University of Technology, Guangzhou, 510180, People's Republic of China. .,Guangdong Provincial Key Laboratory of Biomedical Engineering, South China University of Technology, Guangzhou, 510180, People's Republic of China. .,Key Laboratory of Biomedical Materials and Engineering of the Ministry of Education, South China University of Technology, Guangzhou, 510180, People's Republic of China.
| | - Yuyou Duan
- Laboratory of Stem Cells and Translational Medicine, Institutes for Life Sciences, School of Medicine, South China University of Technology, No. 382 Waihuan East Road, Suite 406, Higher Education Mega Center, Guangzhou, 510006, People's Republic of China. .,National Engineering Research Center for Tissue Restoration and Reconstruction, South China University of Technology, Guangzhou, 510180, People's Republic of China. .,Guangdong Provincial Key Laboratory of Biomedical Engineering, South China University of Technology, Guangzhou, 510180, People's Republic of China. .,Key Laboratory of Biomedical Materials and Engineering of the Ministry of Education, South China University of Technology, Guangzhou, 510180, People's Republic of China.
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Wan HY, Shin RLY, Chen JCH, Assunção M, Wang D, Nilsson SK, Tuan RS, Blocki A. Dextran sulfate-amplified extracellular matrix deposition promotes osteogenic differentiation of mesenchymal stem cells. Acta Biomater 2022; 140:163-177. [PMID: 34875356 DOI: 10.1016/j.actbio.2021.11.049] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 11/24/2021] [Accepted: 11/30/2021] [Indexed: 12/21/2022]
Abstract
The development of bone-like tissues in vitro that exhibit key features similar to those in vivo is needed to produce tissue models for drug screening and the study of bone physiology and disease pathogenesis. Extracellular matrix (ECM) is a predominant component of bone in vivo; however, as ECM assembly is sub-optimal in vitro, current bone tissue engineering approaches are limited by an imbalance in ECM-to-cell ratio. We amplified the deposition of osteoblastic ECM by supplementing dextran sulfate (DxS) into osteogenically induced cultures of human mesenchymal stem cells (MSCs). DxS, previously implicated to act as a macromolecular crowder, was recently demonstrated to aggregate and co-precipitate major ECM components, including collagen type I, thereby amplifying its deposition. This effect was re-confirmed for MSC cultures undergoing osteogenic induction, where DxS supplementation augmented collagen type I deposition, accompanied by extracellular osteocalcin accumulation. The resulting differentiated osteoblasts exhibited a more mature osteogenic gene expression profile, indicated by a strong upregulation of the intermediate and late osteogenic markers ALP and OCN, respectively. The associated cellular microenvironment was also enriched in bone morphogenetic protein 2 (BMP-2). Interestingly, the resulting decellularized matrices exhibited the strongest osteo-inductive effects on re-seeded MSCs, promoted cell proliferation, osteogenic marker expression and ECM calcification. Taken together, these findings suggest that DxS-mediated enhancement of osteogenic differentiation by MSCs is mediated by the amplified ECM, which is enriched in osteo-inductive factors. We have thus established a simple and reproducible approach to generate ECM-rich bone-like tissue in vitro with sequestration of osteo-inductive factors. STATEMENT OF SIGNIFICANCE: As extracellular matrix (ECM) assembly is significantly retarded in vitro, the imbalance in ECM-to-cell ratio hampers current in vitro bone tissue engineering approaches in their ability to faithfully resemble their in vivo counterpart. We addressed this limitation by leveraging a poly-electrolyte mediated co-assembly and amplified deposition of ECM during osteogenic differentiation of human mesenchymal stem cells (MSCs). The resulting pericelluar space in culture was enriched in organic and inorganic bone ECM components, as well as osteo-inductive factors, which promoted the differentiation of MSCs towards a more mature osteoblastic phenotype. These findings thus demonstrated a simple and reproducible approach to generate ECM-rich bone-like tissue in vitro with a closer recapitulation of the in vivo tissue niche.
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10
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Carvalho SG, Dos Santos AM, Silvestre ALP, Meneguin AB, Ferreira LMB, Chorilli M, Gremião MPD. New insights into physicochemical aspects involved in the formation of polyelectrolyte complexes based on chitosan and dextran sulfate. Carbohydr Polym 2021; 271:118436. [PMID: 34364576 DOI: 10.1016/j.carbpol.2021.118436] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 06/19/2021] [Accepted: 07/09/2021] [Indexed: 11/23/2022]
Abstract
Polyelectrolyte complexation is a technique based on interactions between polyelectrolytes of opposite charges driven by supramolecular interactions. Although many studies address the formation of polyelectrolyte complexes (PECs), few explore strategies and tools to select the best working conditions and are often based on empirical choices. This study evaluates the influence of pH, molecular weight, and polymeric proportion on the formation of PECs based on chitosan:dextran sulfate. In addition, it assesses the approaches that study the influence of pH on the zeta potential of polymeric dispersions as a tool in the design of PECs. Results showed that nanoparticles with an excess of polycation formed aggregates, while an excess of dextran sulfate reduced the size of the particles. The graph of zeta potential as a function of pH proved to be a promising tool in the choice of polymers and a better pH condition in the development of PECs.
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11
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Huang Y, Wang W, Xu YY, Guo J, Jiao L, Wang H, Li M, Yang Q. Dextran sulfate inhibits cell proliferation and induces apoptosis by regulating EZH2 in gastric carcinoma. Curr Cancer Drug Targets 2021; 21:953-964. [PMID: 34551698 DOI: 10.2174/1568009621666210922112039] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2021] [Revised: 06/14/2021] [Accepted: 06/21/2021] [Indexed: 12/09/2022]
Abstract
BACKGROUND Gastric cancer (GC) is one of the most common gastrointestinal malignancies. According to reports, the enhancer of zeste homolog 2 (EZH2) exhibits carcinogenic function in a variety of cancers. Therefore, EZH2 may be a potential therapeutic target for the treatment of human cancer. Macromolecular dextran sulfate (DS) has been displayed to play a critical role in tumor inhibition. However, the molecular mechanism by which DS mediates this effect is unclear. OBJECTIVES In this study, we explored the effects of DS on the proliferation and apoptosis of gastric cancer and the related mechanisms. Cell proliferation and counting assays, as well as cell colony formation assays, revealed that DS inhibited the proliferation and tumorigenesis of GC cells. Additionally, flow cytometry analysis displayed that DS blocked the cell cycle of GC cells in the G1/S phase and promoted their apoptosis. METHODS Bioinformatics analyses, enzyme-linked immunosorbent assays, immunohistochemistry, and other methods were applied to measure the expression of EZH2 in human GC cells and tissues. RESULTS AND DISCUSSION Further studies have shown that DS treatment can reduce the expression of proliferating cell nuclear antigen (PCNA) and increase the level of the ratio of Bax: Bcl-2 protein in GC cells. In addition, DS reduced EZH2 levels and increased CXXC finger protein 4 levels both in vitro and in vivo. In addition, down-regulation of EZH2 with EZH2 inhibitors reversed the inhibitory effect of DS on gastric cancer cells. CONCLUSION Collectively, our work demonstrates that DS suppresses proliferation and promotes apoptosis of GC cells by regulating EZH2. Our study suggests that DS is a promising therapeutic compound for the treatment of GC.
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Affiliation(s)
- Yunning Huang
- Department of Gastrointestinal Surgery, the Affiliated People's Hospital of Ningxia Medical University, Yinchuan, Ningxia 750001. China
| | - Wenjun Wang
- Department of Pathology, Ningxia Medical University, Yinchuan. China
| | - Yuan-Yi Xu
- Department of Pathology, Ningxia Medical University, Yinchuan. China
| | - Jiaxin Guo
- Department of Pathology, Ningxia Medical University, Yinchuan. China
| | - Longxing Jiao
- Department of Gastrointestinal Surgery, the Affiliated People's Hospital of Ningxia Medical University, Yinchuan, Ningxia 750001. China
| | - Honghong Wang
- Department of Pathology, the Affiliated People's Hospital of Ningxia Medical University, Yinchuan, Ningxia 750001. China
| | - Mengqi Li
- Department of Pathology, Ningxia Medical University, Yinchuan. China
| | - Qi Yang
- Department of Gastroenterology, Henan NO.3 Provincial People's Hospital, Zhengzhou. China
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12
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Kikuchi T, Matsuura K, Shimizu T. Non-coating method for non-adherent cell culture using high molecular weight dextran sulfate and bovine serum albumin. J Biosci Bioeng 2021; 132:537-542. [PMID: 34518107 DOI: 10.1016/j.jbiosc.2021.08.006] [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: 06/14/2021] [Revised: 08/12/2021] [Accepted: 08/18/2021] [Indexed: 11/19/2022]
Abstract
Non-adherent cell culture surface has been widely used for producing cell spheroids and cell aggregates. The purpose of this study was to formulate a new method for non-adherent cell culture without coating or surface-modification that has been needed. We found that high-molecular-weight dextran sulfate (DS) and bovine serum albumin (BSA) synergistically prevented cell adhesion in media supplemented with no or low serum. This method worked on tissue culture-treated polystyrene surfaces as well as on commercially available low-attachment- and untreated polystyrene surfaces. Further investigation revealed that BSA may mediate the adsorption of DS to the surface. In addition, as the adsorption of fluorescently labeled fibronectin was inhibited by BSA alone, it appears that protein adsorption and cell adhesion do not always correlate. Finally, we demonstrated the successful formation of HepG2 spheroids and cardiomyocyte aggregates using this method. In conclusion, cell adhesion can be effectively suppressed by simply adding DS and BSA to the culture medium without coating or surface modification, and it may be useful for generating cell spheroids and aggregates.
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Affiliation(s)
- Tetsutaro Kikuchi
- Institute of Advanced Biomedical Engineering and Science, Tokyo Women's Medical University (TWIns), 8-1 Kawada-cho, Shinjuku-ku, Tokyo 162-8666, Japan.
| | - Katsuhisa Matsuura
- Institute of Advanced Biomedical Engineering and Science, Tokyo Women's Medical University (TWIns), 8-1 Kawada-cho, Shinjuku-ku, Tokyo 162-8666, Japan
| | - Tatsuya Shimizu
- Institute of Advanced Biomedical Engineering and Science, Tokyo Women's Medical University (TWIns), 8-1 Kawada-cho, Shinjuku-ku, Tokyo 162-8666, Japan
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13
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Huang YN, Xu YY, Ma Q, Li MQ, Guo JX, Wang X, Jin X, Shang J, Jiao LX. Dextran Sulfate Effects EMT of Human Gastric Cancer Cells by Reducing HIF-1α/ TGF-β. J Cancer 2021; 12:3367-3377. [PMID: 33976746 PMCID: PMC8100798 DOI: 10.7150/jca.55550] [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] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Accepted: 03/23/2021] [Indexed: 01/10/2023] Open
Abstract
The peritoneal implant metastasis is one of the main pathway and main cause for high mortality for gastric cancer metastasis. Researchs show that epithelial-mesenchymal transition (EMT) playing essential role in modulating gastric cancer metastasis, and the expression of hypoxia inducible factor-1α (HIF-1α) can promote EMT in tumor cells. This research aims to explore the influence and mechanism of Dextran Sulfate (DS) affecting EMT of human gastric cancer. In the present study, we found that DS can enter into the cytoplasm and function in it. Inhibition of HIF-1α or DS significantly inhibit the migration and invasion of human gastric cancer cells, and decrease the mRNA and protein expressions of HIF-1α, matrix metalloproteinase-2 (MMP-2), transforming growth factor-β (TGF-β), Twist and N-cadherin (N-cad), rise E-cadherin (E-cad) expression, DS with HIF-1α knockdown has a stronger effect. In vivo studies indicated that compared with using DS or HIF-1α knockdown alone, DS with HIF-1α knockdown can better suppress the volume and number of metastatic tumors, and reduce the mRNA and protein expressions of HIF-1α, MMP-2, TGF-β, Twist and N-cad in metastatic tumor tissues of nude mice. We further demonstrated that the expression of HIF-1α, MMP-2, TGF-β , Twist and N-cad were higher in well and poorly differentiated gastric cancer than paracancerous tissue, and poorly differentiated gastric cancer were even higher, while E-cad expression was opposite. Taken together, this study shows that DS can interfere the expression of HIF-1α, thereby inhibiting TGF-β-mediated EMT of gastric cancer cells, and demonstrated a promising application of DS in gastric cancer therapy.
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Affiliation(s)
- Yun-Ning Huang
- Department of Gastrointestinal Surgery, The Affiliated People's Hospital of Ningxia Medical University, Yinchuan, Ningxia , P.R. China
| | - Yuan-Yi Xu
- Department of Pathology, Ningxia Medical University, Yinchuan, Ningxia, P.R. China
| | - Qian Ma
- College of Life Sciences, Ningxia University, Yinchuan , Ningxia, P.R. China.,College of Basic Medicine, Ningxia Medical University, Yinchuan, Ningxia, P.R. China
| | - Meng-Qi Li
- Department of Pathology, Ningxia Medical University, Yinchuan, Ningxia, P.R. China
| | - Jia-Xin Guo
- Department of Pathology, Ningxia Medical University, Yinchuan, Ningxia, P.R. China
| | - Xiaofei Wang
- Department of Pathology,North China University of Science and Technology Affiliated Hospital, Tangshan, Hebei, P.R. China
| | - Xiu Jin
- Department of Pathology, Affiliated Hospital of Jining Medical University, Jining, Shandong, P.R. China
| | - Jing Shang
- Department of Pathology, Ningxia Medical University, Yinchuan, Ningxia, P.R. China
| | - Long-Xing Jiao
- Department of Pathology, Ningxia Medical University, Yinchuan, Ningxia, P.R. China
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14
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Gordon E, Segal S, Sabou AK, Gemene KL. Quantitative determination of dextran sulfate and pentosan polysulfate and their binding with protamine using chronopotentiometry with polyion-selective electrodes. Anal Chim Acta 2021; 1149:338208. [PMID: 33551060 DOI: 10.1016/j.aca.2021.338208] [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] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2020] [Revised: 12/21/2020] [Accepted: 01/06/2021] [Indexed: 11/18/2022]
Abstract
We report for the first time a chronopotentiometric measurement of polyanions based on localized ion depletion at the sample/membrane interface at a characteristic transition time τ, using polymer membrane polyanion-selective electrodes. Chronopotentiometric transduction of polyions based on the measurement of transition time has analytically more attractive applications compared to the controlled-current reversible pulsed chronopotentiometric transduction based on electromotive force (emf) measurement. This is because traditional polyion-selective electrodes based on emf measurement intrinsically give nonlinear (sigmoidal) calibration curves. While these can be used for indirect determination of polyions via polyanion-polycation titrations, they are not convenient for direct quantitation. However, under chronopotentiometric measurement based on the measurement of transition time, the square root of the transition time τ is linearly related to the concentration of the polyion according to the Sand equation and can be used for a direct calibration-free rapid determination. In this work, we have measured the concentrations of dextran sulfate (DS) and pentosan polysulfate (PPS) using polyanion selective electrodes under chronopotentiometric method where the transition time was measured and controlled-current pulsed chronopotentiometric transductions, where the phase boundary potential (emf) was measured. In addition, the protamine-DS and the protamine-PPS binding ratios have been determined using both transductions. The protamine-PPS binding ratio was determined to be 1.51:1 by the titration method and 1.54:1 by chronopotentiometry. The protamine-DS binding ratio was determined to be 1.37:1 by the titration method and 1.41:1 by chronopotentiometry, showing excellent agreement between the two methods. These simple measurement methods of binding ratios between polysaccharides and polypeptides may become important tools for screening safer and more reliable antidotes for the newer and safer anticoagulants such as Low Molecular Weight Heparins(LMWHs) and also to determine the dosages of antidotes needed to neutralize the anticoagulant activity.
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Affiliation(s)
- Emma Gordon
- Department of Chemistry, Northern Kentucky University, Nunn Drive, Highland Heights, KY, 41099, USA
| | - Simon Segal
- Department of Chemistry, Northern Kentucky University, Nunn Drive, Highland Heights, KY, 41099, USA
| | - Ana-Karina Sabou
- Faculty of Chemistry and Chemical Engineering, University of Babes-Bolyai, Cluj Napoca, Romania
| | - Kebede L Gemene
- Department of Chemistry, Northern Kentucky University, Nunn Drive, Highland Heights, KY, 41099, USA.
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15
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Matsushima-Nagata K, Sugiuchi H, Anraku K, Takao T, Kondo Y, Ishitsuka Y, Irikura M, Irie T, Matsumura T, Araki E, Sumida M, Katayama Y, Kayahara N. A homogeneous assay to determine high-density lipoprotein subclass cholesterol in serum. Anal Biochem 2020; 613:114019. [PMID: 33189705 DOI: 10.1016/j.ab.2020.114019] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 11/06/2020] [Accepted: 11/10/2020] [Indexed: 12/15/2022]
Abstract
Existing methods to measure high-density lipoprotein cholesterol (HDL-C) subclasses (HDL2-C and HDL3-C) are complex and require proficiency, and thus there is a need for a convenient, homogeneous assay to determine HDL-C subclasses in serum. Here, cholesterol reactivities in lipoprotein fractions [HDL2, HDL3, low-density lipoprotein (LDL), and very-low-density lipoprotein (VLDL)] toward polyethylene glycol (PEG)-modified enzymes were determined in the presence of varying concentrations of dextran sulfate and magnesium nitrate. Particle sizes formed in the lipoprotein fractions were measured by dynamic light scattering. We optimized the concentrations of dextran sulfate and magnesium nitrate before assay with PEG-modified enzymes to provide selectivity for HDL3-C. On addition of dextran sulfate and magnesium nitrate, the sizes of particles of HDL2, LDL, and VLDL increased, but the size of HDL3 fraction particles remained constant, allowing only HDL3-C to participate in coupled reactions with the PEG-modified enzymes. In serum from both healthy volunteers and patients with type 2 diabetes, a good correlation was observed between the proposed assay and ultracentrifugation in the determination of HDL-C subclasses. The assay proposed here enables convenient and accurate determination of HDL-C subclasses in serum on a general automatic analyzer and enables low-cost routine diagnosis without preprocessing.
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Affiliation(s)
| | | | | | - Takako Takao
- Department of Clinical Chemistry and Informatics, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan
| | - Yuki Kondo
- Department of Clinical Chemistry and Informatics, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan
| | - Yoichi Ishitsuka
- Department of Clinical Chemistry and Informatics, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan
| | - Mitsuru Irikura
- Laboratory of Evidence-Based Pharmacotherapy, Daiichi University of Pharmacy, Fukuoka, Japan
| | - Tetsumi Irie
- Department of Clinical Chemistry and Informatics, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan
| | - Takeshi Matsumura
- Department of Metabolic Medicine, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan
| | - Eiichi Araki
- Department of Metabolic Medicine, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan
| | - Mizuki Sumida
- Research Center, Hitachi Chemical Diagnostics Systems Co., Ltd., Shizuoka, Japan
| | - Yuki Katayama
- Research Center, Hitachi Chemical Diagnostics Systems Co., Ltd., Shizuoka, Japan
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16
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Wang X, Yang B, Xu X, Su M, Xi M, Yin Z. Dextran sulfate-modified pH-sensitive layered double hydroxide nanocomposites for treatment of rheumatoid arthritis. Drug Deliv Transl Res 2021; 11:1096-106. [PMID: 32779111 DOI: 10.1007/s13346-020-00832-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
To reduce the side effects of methotrexate and increase its anti-inflammatory effect, we developed a drug delivery system, dextran sulfate-modified methotrexate-loaded layered double hydroxide nanocomposites (LDH-MTX-DS), with both targeting and pH-sensitivity for the treatment of rheumatoid arthritis. The nanocomposites had a mean particle size of 303.1 ± 8.07 nm, zeta potential of - 12.4 ± 0.7 mV, encapsulation efficiency of 49.64%, and loading efficiency of 16.81%. In vitro release experiments demonstrated that the drug was released faster in PBS at pH 5.5 than at pH 7.4, which reflected the pH-sensitivity of this system. Cellular uptake assays displayed higher cellular uptake rate of the dextran sulfate-modified targeting carrier compared with that of a non-targeting carrier (P < 0.01), which indicated that the LDH-MTX-DS could actively target scavenger receptors on the surface of activated RAW 264.7 cells. In vivo pharmacodynamic experiments showed that, after the second (P < 0.001) and third (P < 0.05) administrations, the preparation group exhibited significantly improved therapeutic efficacy in adjuvant-induced arthritis (AIA) rats when compared with free MTX alone. These results indicated that this drug delivery system was promising in the treatment of rheumatoid arthritis. Graphical abstract.
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17
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She P, Bian S, Cheng Y, Dong S, Liu J, Liu W, Xiao C. Dextran sulfate-triamcinolone acetonide conjugate nanoparticles for targeted treatment of osteoarthritis. Int J Biol Macromol 2020; 158:1082-1089. [PMID: 32389649 DOI: 10.1016/j.ijbiomac.2020.05.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Revised: 04/05/2020] [Accepted: 05/02/2020] [Indexed: 02/06/2023]
Abstract
Osteoarthritis (OA) is a synovial inflammatory condition characterized by cartilage destruction and osteophyte formation. Macrophages play a central role in OA pathogenesis by producing proinflammatory cytokines. Intra-articular corticosteroid administration can relieve refractory pain and inflamed effusion of knee joints. However, limitations, such as rapid clearance from the joint space, potential damage to articular cartilage, and accelerated joint degeneration, may hamper the clinical application of corticosteroids. In this study, we reported the design and preparation of dextran sulfate-triamcinolone acetonide conjugate (DS-TA) nanoparticles (NPs) for treating OA by specifically targeting scavenger receptor class A (SR-A) on activated macrophages. We verified the excellent targeting specificity of DS-TA NPs to SR-A by flow cytometry and confocal laser scanning microscopy. DS-TA NPs were found to effectively reduce the viability of activated macrophages (RAW 264.7 cells) and the expression of proinflammatory cytokines. Intra-articular injection of DS-TA NPs effectively alleviated the structural damages to the joint cartilage, as confirmed in histopathological analysis. Additionally, DS-TA NPs decreased the expression of proinflammatory cytokines, including IL-1β, IL-6, and TNF-α, in the cartilage tissue. Thus, DS-TA NPs are a potential therapeutic nanomedicine for the targeted treatment of OA.
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Affiliation(s)
- Peng She
- Joint Surgery Department, The First Hospital, Jilin University, Changchun 130021, PR China; Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China
| | - Shuai Bian
- Joint Surgery Department, The First Hospital, Jilin University, Changchun 130021, PR China; Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China
| | - Yuanqiang Cheng
- Joint Surgery Department, The First Hospital, Jilin University, Changchun 130021, PR China; Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China
| | - Shujun Dong
- VIP Integrated Department, Stomatological Hospital of Jilin University, Changchun 130021, PR China.
| | - Jianguo Liu
- Joint Surgery Department, The First Hospital, Jilin University, Changchun 130021, PR China.
| | - Wanguo Liu
- Department of Orthopaedic Surgery, China-Japan Union Hospital, Jilin University, Changchun 130033, PR China.
| | - Chunsheng Xiao
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China
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18
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Motiei M, Sedlařík V, Lucia LA, Fei H, Münster L. Stabilization of chitosan-based polyelectrolyte nanoparticle cargo delivery biomaterials by a multiple ionic cross-linking strategy. Carbohydr Polym 2020; 231:115709. [PMID: 31888842 DOI: 10.1016/j.carbpol.2019.115709] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Revised: 11/25/2019] [Accepted: 12/05/2019] [Indexed: 11/21/2022]
Abstract
PolyElectrolyte Nanoparticles (PENs) obtained by layer-by-layer self-assembly of polycations/polyanions suffer from a lack of colloidal stability in physiological conditions. We report a simple innovative approach for increasing their stability by multiple ionic cross-linkers. Herein, a chitosan-based core was stabilized by polyanions such as tripolyphosphate and dextran sulfate at pHs of 3 (aPENs) and 8 (bPENs) to improve the quality of electrostatic interactions in the core and manage self-assembly of polyethyleneimine shell onto the core. The physicochemical properties of the particles were characterized by DLS, SEM, TEM, FT-IR, and TGA. TEM micrographs showed visible core/shell structures of bPENs. From particle size and polydispersity indices, the bPENs stability was salt concentration-dependent. The release profiles of PENs using nicotinic acid demonstrated sustained release in a pH-independent manner with a good fit of Korsmeyer-Peppas model. These results suggest that multiple ionic cross-linkers can be an efficient approach to increase the colloidal stability of PENs.
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Elahi SM, Shen CF, Gilbert R. Impact of dextran sulfate in culture media on titration of vesicular stomatitis virus. J Virol Methods 2019; 275:113758. [PMID: 31678047 DOI: 10.1016/j.jviromet.2019.113758] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Revised: 10/24/2019] [Accepted: 10/24/2019] [Indexed: 11/16/2022]
Abstract
Viral vectors derived from vesicular stomatitis virus (VSV) are important vectors for the development of vaccines and for the treatment of cancer. The efficiency of therapy based on VSV is dependent on the dose of virus used. Therefore it is essential to measure accurately and reproducibly the amount of functional vectors in the samples to be tested. Two common methods used to measure the titer of VSV are TCID50% and plaque assay. In the current study, we compared these two titration methods by using a recombinant VSV expressing the green fluorescent protein (VSV-GFP) as a model virus. Some culture media developed for suspension mammalian cells contain dextran sulfate. We observed that plaque assay, but not TCID50%, can underestimate the virus titer up to 10 fold when VSV-GFP was produced in culture media containing dextran sulfate. Dextran sulfate is commonly used in serum-free culture media to reduce cell aggregation in suspension culture. The inhibitory effect of dextran sulfate on the titration of VSV-GFP was confirmed by supplementing the culture medium with this compound during virus production. Our results also demonstrated that extending the incubation time during plaque assay and TCID50% increases virus titer.
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Affiliation(s)
- Seyyed Mehdy Elahi
- Department of Bioprocess Engineering, National Research Council Canada, Building Montreal, Montréal, Canada.
| | - Chun Fang Shen
- Department of Bioprocess Engineering, National Research Council Canada, Building Montreal, Montréal, Canada.
| | - Rénald Gilbert
- Department of Bioprocess Engineering, National Research Council Canada, Building Montreal, Montréal, Canada; Department of Bioengineering, McGill University, Montréal, Canada.
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Nogueira DES, Rodrigues CAV, Carvalho MS, Miranda CC, Hashimura Y, Jung S, Lee B, Cabral JMS. Strategies for the expansion of human induced pluripotent stem cells as aggregates in single-use Vertical-Wheel™ bioreactors. J Biol Eng 2019; 13:74. [PMID: 31534477 PMCID: PMC6744632 DOI: 10.1186/s13036-019-0204-1] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Accepted: 09/04/2019] [Indexed: 12/19/2022] Open
Abstract
Background Since their inception, human induced pluripotent stem cells (hiPSCs) have held much promise for pharmacological applications and cell-based therapies. However, their potential can only be realised if large numbers of cells can be produced reproducibly on-demand. While bioreactors are ideal systems for this task, due to providing agitation and control of the culture parameters, the common impeller geometries were not designed for the expansion of mammalian cells, potentially leading to sub-optimal results. Results This work reports for the first time the usage of the novel Vertical-Wheel single-use bioreactors for the expansion of hiPSCs as floating aggregates. Cultures were performed in the PBS MINI 0.1 bioreactor with 60 mL of working volume. Two different culture media were tested, mTeSR1 and mTeSR3D, in a repeated batch or fed-batch mode, respectively, as well as dextran sulfate (DS) supplementation. mTeSR3D was shown to sustain hiPSC expansion, although with lower maximum cell density than mTeSR1. Dextran sulfate supplementation led to an increase in 97 and 106% in maximum cell number when using mTeSR1 or mTeSR3D, respectively. For supplemented media, mTeSR1 + DS allowed for a higher cell density to be obtained with one less day of culture. A maximum cell density of (2.3 ± 0.2) × 106 cells∙mL− 1 and a volumetric productivity of (4.6 ± 0.3) × 105 cells∙mL− 1∙d− 1 were obtained after 5 days with mTeSR1 + DS, resulting in aggregates with an average diameter of 346 ± 11 μm. The generated hiPSCs were analysed by flow cytometry and qRT-PCR and their differentiation potential was assayed, revealing the maintenance of their pluripotency after expansion. Conclusions The results here described present the Vertical-Wheel bioreactor as a promising technology for hiPSC bioprocessing. The specific characteristics of this bioreactor, namely in terms of the innovative agitation mechanism, can make it an important system in the development of hiPSC-derived products under current Good Manufacturing Practices.
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Affiliation(s)
- Diogo E S Nogueira
- 1Department of Bioengineering and iBB, Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal.,2The Discoveries Centre for Regenerative and Precision Medicine, Lisbon Campus, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal
| | - Carlos A V Rodrigues
- 1Department of Bioengineering and iBB, Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal.,2The Discoveries Centre for Regenerative and Precision Medicine, Lisbon Campus, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal
| | - Marta S Carvalho
- 1Department of Bioengineering and iBB, Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal.,2The Discoveries Centre for Regenerative and Precision Medicine, Lisbon Campus, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal
| | - Cláudia C Miranda
- 1Department of Bioengineering and iBB, Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal.,2The Discoveries Centre for Regenerative and Precision Medicine, Lisbon Campus, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal
| | | | | | | | - Joaquim M S Cabral
- 1Department of Bioengineering and iBB, Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal.,2The Discoveries Centre for Regenerative and Precision Medicine, Lisbon Campus, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal
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Elmowafy E, Soliman ME. Losartan-chitosan/ dextran sulfate microplex as a carrier to lung therapeutics: Dry powder inhalation, aerodynamic profile and pulmonary tolerability. Int J Biol Macromol 2019; 136:220-229. [PMID: 31195046 DOI: 10.1016/j.ijbiomac.2019.06.058] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2019] [Revised: 05/19/2019] [Accepted: 06/09/2019] [Indexed: 12/25/2022]
Abstract
This study aims to obtain an inhalation powder with meaningful aerodynamic and safety profiles for the lung delivery of losartan (LS). For this, the capacity of self-assembly of chitosan (CS) and dextran sulfate (DS) to form CS/DS microplex (MC), incorporating high payload of hydrophilic LS was harnessed. Dry powder inhaler (LS-MC-DPI), prepared via spray drying of the best achieved LS-MC, was proposed to impart precise engineered inhalation characteristics. Micrometric robust CS/DS MC was revealed to offer the opportunity to heighten LS encapsulation, accounting for ~75%. LS-MC-DPI was successfully developed with high yield, flowability, respirable aerodynamic size and morphology which formed swellable and mucoadhesive network, facilitating intra-pulmonary delivery. Moreover, sustained release pattern, augmented deep lung deposition and safe histological profile were realized. Overall, the newly developed LS-MC DPI shows promises as an inhalation system. The aerodynamic performance and safety of LS-MC-DPI verify its suitability for further in vivo lung therapeutics.
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Affiliation(s)
- Enas Elmowafy
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Ain Shams University, Cairo, Egypt, Monazzamet Elwehda Elafrikeya Street, Abbaseyya, Cairo P.O. 11566, Egypt.
| | - Mahmoud E Soliman
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Ain Shams University, Cairo, Egypt, Monazzamet Elwehda Elafrikeya Street, Abbaseyya, Cairo P.O. 11566, Egypt
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Benhalima T, Ferfera-Harrar H. Eco-friendly porous carboxymethyl cellulose/ dextran sulfate composite beads as reusable and efficient adsorbents of cationic dye methylene blue. Int J Biol Macromol 2019; 132:126-141. [PMID: 30926505 DOI: 10.1016/j.ijbiomac.2019.03.164] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [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: 02/16/2019] [Revised: 03/18/2019] [Accepted: 03/24/2019] [Indexed: 12/11/2022]
Abstract
Eco-friendly hydrogel composite beads based on crosslinked-carboxymethyl cellulose (CMC) and dextran sulfate (DS) embedded within network were prepared using ionotropic gelation in presence of sodium n-dodecyl sulfate (SDS) as pore-forming template. The milligels composites C/Dx were characterized by FTIR, SEM/EDX and TGA analyses. The composites exhibited porous structure and enhance in swelling properties with enriching DS as well as pH-sensitivity. The effect of DS on adsorption of composites for cationic dye methylene blue (MB) was investigated by changing influencing factors: pH, adsorbent dosage, time contact, dye concentration, and temperature. The results revealed that adsorption performances were remarkably improved by increasing DS content into beads. Kinetics and isotherm adsorption studies revealed pseudo second-order and Langmuir isotherm as befitting models. The maximum Langmuir equilibrium adsorption capacity (qm) was found to increase from 82 mg g-1 for C/D0 to 526 mg g-1 for C/D1. Thermodynamic study revealed spontaneous and endothermic process nature. Furthermore, milligels displayed good reusability after five adsorption/desorption cycles and with an augment in their removal ability compared to starting ones, reaching 714 mg g-1 for R-C/D1. In view of easy preparation and recovery, effectiveness adsorption and good regeneration, the composites could be applied as low-cost adsorbents in wastewater treatment.
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Affiliation(s)
- Tayeb Benhalima
- Materials Polymer Laboratory, Department of Macromolecular Chemistry, Faculty of Chemistry, University of Sciences and Technology Houari Boumediene USTHB, B.P. 32 El-Alia, 16111 Algiers, Algeria
| | - Hafida Ferfera-Harrar
- Materials Polymer Laboratory, Department of Macromolecular Chemistry, Faculty of Chemistry, University of Sciences and Technology Houari Boumediene USTHB, B.P. 32 El-Alia, 16111 Algiers, Algeria.
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Shutava TG, Livanovich KS, Sharamet AA. Layer-by-layer films of polysaccharides modified with polyethylene glycol and dextran. Colloids Surf B Biointerfaces 2018; 173:412-420. [PMID: 30321799 DOI: 10.1016/j.colsurfb.2018.10.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Revised: 09/07/2018] [Accepted: 10/04/2018] [Indexed: 01/18/2023]
Abstract
Layer-by-layer (LbL) films with enhanced resistance to protein adsorption were obtained on the basis of N-grafted copolymers of chitosan with polyethylene glycol (PEG) or dextran (DEX). The copolymers with the backbone molecular weight of 18 and 450 kDa, side chains of PEG of 5.0 and 0.9 kDa, DEX of 6.0 kDa and the degree of amine groups substitution χSub as high as ∼0.25 were alternated with dextran sulfate (DS) to assemble up to 10 bilayer films. The film material contains 85±5% of water with virtually no effect of the copolymer structure. By utilizing the graft copolymers and applying suitable number of copolymer/DS bilayers to the surface, the mass of adsorbed fetal bovine serum proteins was decreased by 70-85% as compared to that on unmodified chitosan/DS film. In terms of overlapping side chains on the LbL surface the copolymers of PEG and DEX are equally effective in tailoring protein-resistant materials.
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Affiliation(s)
- Tatsiana G Shutava
- Institute of Chemistry of New Materials, National Academy of Sciences of Belarus, Minsk, Belarus.
| | - Kanstantsin S Livanovich
- Institute of Chemistry of New Materials, National Academy of Sciences of Belarus, Minsk, Belarus
| | - Anastasiya A Sharamet
- Institute of Chemistry of New Materials, National Academy of Sciences of Belarus, Minsk, Belarus
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Chen Z, Zhang Y, Lin Z, Ye X, Zhang Y, Xia Y, Xia H, Yin Q. [Radiological evaluation of dextran sulfate/recombinant human bone morphogenetic protein 2/chitosan composite microspheres combined with coral hydroxyapatite artificial bone in repairing large segmental bone defects]. Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi 2018; 31:1384-1389. [PMID: 29798596 DOI: 10.7507/1002-1892.201703094] [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] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Objective To evaluate the osteogenic effect of dextran sulfate/recombinant human bone morphogenetic protein 2/chitosan (DS/rhBMP-2/CS) combined with coralline hydroxyapatite (CHA) in repairing large segmental bone defects by radiographic feature. Methods Fifty-seven 24-week-old male New Zealand rabbits were prepared for establishing right radius bone defect model of 20 mm in length. In which 54 rabbits were randomly divided into 3 groups ( n=18), and the CHA, DS/rhBMP-2/CS/CHA, and rhBMP-2/CHA artificial bone grafts were implanted into the bone defect in groups A, B, and C respectively; the remaining 3 rabbits were implanted nothing as blank control group. After operation, the gross condition of the animals was observed; at 4, 8, and 12 weeks after operation, X-ray film observation, Micro-CT scanning, and three-dimensional reconstruction were performed to obtain the volume of the new bone. Results The experimental animals recovered well and were in normal condition. X-ray observation showed that the bone healing in group B was better than that in groups A and C at each time point. At each time point after operation, the X-ray scores of group B were significantly higher than that of group A and group C ( P<0.05); the scores of group C at 8 and 12 weeks after operation were significantly higher than that of group B ( P<0.05). Micro-CT scanning and three-dimensional reconstruction observation showed that at each time point after operation in group A, the bone defect area had less bone formation and poor osteogenesis; in group B, there were many new bone tissues in bone defect area, and the bone remodeling was well, and gradually closed to normal bone morphology at 12 weeks; in group C, there were many new bone tissues in bone defect area, but the bone formation was general. The new bone volume of group B was significantly higher than that of group A and group C ( P<0.05) at each time point after operation, and the score of group C was higher than that of group A at 8 weeks after operation ( P<0.05). Conclusion The osteogenic effect of DS/rhBMP-2/CS/CHA sustained-release artificial bone is much better than that of single CHA and rhBMP-2/CHA, which can provide a new idea for treating bone defect by using bone tissue engineering in the future.
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Affiliation(s)
- Zepeng Chen
- Orthopedic Hospital, Guangzhou General Hospital of Chinese PLA, Guangzhou Guangdong, 510010, P.R.China
| | - Ying Zhang
- Orthopedic Hospital, Guangzhou General Hospital of Chinese PLA, Guangzhou Guangdong, 510010, P.R.China
| | - Zefeng Lin
- Orthopedic Hospital, Guangzhou General Hospital of Chinese PLA, Guangzhou Guangdong, 510010, P.R.China
| | - Xiangling Ye
- Orthopedic Hospital, Guangzhou General Hospital of Chinese PLA, Guangzhou Guangdong, 510010, P.R.China
| | - Yongqiang Zhang
- Orthopedic Hospital, Guangzhou General Hospital of Chinese PLA, Guangzhou Guangdong, 510010, P.R.China
| | - Yuanjun Xia
- Orthopedic Hospital, Guangzhou General Hospital of Chinese PLA, Guangzhou Guangdong, 510010,
| | - Hong Xia
- Orthopedic Hospital, Guangzhou General Hospital of Chinese PLA, Guangzhou Guangdong, 510010, P.R.China
| | - Qingshui Yin
- Orthopedic Hospital, Guangzhou General Hospital of Chinese PLA, Guangzhou Guangdong, 510010, P.R.China
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Shi L, Wang J, Yang Q, Shi L, Liu L, Feng X, Chai S, Gou J, Zang F, He S. Effect of Yang-activating and stasis-eliminating decoction from Traditional Chinese Medicine on intestinal mucosal permeability in rats with ulcerative colitis induced by dextran sulfate sodium. J TRADIT CHIN MED 2017; 37:452-460. [PMID: 32188203] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
OBJECTIVE To evaluate the effect of decoction prepared with Yang-activating and stasis-eliminating medicinals from Traditional Chinese Medicine (TCM) on the intestinal mucosal permeability in rats with ulcerative colitis induced by dextran sulfate sodium (DSS). METHODS Totally 55 male Wistar rats (body weight of 170-190 g) were randomly divided into the blank group (n = 10) and the model duplication group (n = 45). The blank group was not intervened, while the other was modeled with 5% dextran sulfate sodium by gavaging in a dosage of 4 mL per day to induce ulcerative colitis, a total of 7 days. Then, the model rats were divided into model blank group, mesalazine group and TCM group, and each group was consisted of 15 rats. They were given retention enema 10 min with normal saline, mesalazine enema (0.036 g/mL), and Yang-activating and stasis-eliminating decoction [0.54 g/mL of a decoction boiled by Puhuang (Pollen Typhae), Xiebai (Bulbus Allii Macrostemonis) and Wulingzhi (Faeces Trogopteri)] for 10 days respectively. Afterwards, all of the rats were evaluated by disease activity index (DAI), histological changes of distal colon, expression of occludin protein and ultrastructure of intestinal epithelial cells. Furthermore, ratio of lactulose to mannitol (L/M) discharged in urine was evaluated. RESULTS Comparing the results between TCM and model control groups, scores of DAI and histological lesions decreased significantly (P = 0.000 < 0.01), ultrastructures of intestinal epithelial cells and tight junctions were more complete. The expression of occludin protein (P = 0.001 < 0.01) increased while the L/M value decreased significantly (P = 0.000 < 0.01) in TCM group. There was no statistical difference between the TCM and mesalazine groups in results of each item (P > 0.05). CONCLUSION The decoction prepared with Yang-activating and stasis-eliminating TCM medicianls can restore intestinal mucosal epithelial cells and tight junctions the model rats with ulcerative colitis; it can reduce histological lesions and protect the permeability of intestinal mucosa barrier in the rats as well.
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Affiliation(s)
- Lijie Shi
- Department of Spleen and Stomach, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin 300193, China
| | - Jing Wang
- Department of Spleen and Stomach, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin 300193, China
| | - Qiang Yang
- Department of Spleen and Stomach, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin 300193, China
| | - Lei Shi
- Department of Graduate School of Beijing University of Chinese Medicine, Beijing 100029, China
| | - Leilei Liu
- Department of Graduate School of Tianjin University of Traditional Chinese Medicine, Tianjin 300000, China
| | - Xiuxian Feng
- Department of Spleen and Stomach, Shijiazhuang Traditional Chinese Medicine hospital, Shijiazhuang 050000, China
| | - Shiwei Chai
- Department of Pharmacy, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin 300193, China
| | - Jing Gou
- Department of Clinical Laboratory, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin 300193, China
| | - Fenglin Zang
- Department of Pathology, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China
| | - Sufei He
- Department of Scientific Research, Tianjin University of Traditional Chinese Medicine, Tianjin 300073, China
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Dong B, Hadinoto K. Direct comparison between millifluidic and bulk-mixing platform in the synthesis of amorphous drug-polysaccharide nanoparticle complex. Int J Pharm 2017; 523:42-51. [PMID: 28323097 DOI: 10.1016/j.ijpharm.2017.03.021] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Revised: 03/10/2017] [Accepted: 03/12/2017] [Indexed: 11/22/2022]
Abstract
Amorphous drug-polysaccharide nanoparticle complex (or drug nanoplex) had emerged as an ideal supersaturating delivery system of poorly-soluble drugs attributed to its many attractive characteristics. Herein we presented for the first time direct comparison between two nanoplex synthesis platforms, i.e. millifluidics and bulk mixing, representing continuous and batch production modes, respectively. They were compared by the resultant nanoplex's (1) physical characteristics (size, zeta potential, and payload), (2) preparation efficiency, (3) storage stability, (4) dissolution rate/supersaturation generation, and (5) production consistency. The effects of key variables in drug-polysaccharide complexation (pH, charge ratio) were investigated in both platforms. Perphenazine and dextran sulfate were used as the drug and polysaccharide models, respectively. The results showed that both platforms shared similar dependences on pH and charge ratio with similar optimal preparation conditions, where the pH was the governing variable through its influence on size and zeta potential, Nanoplexes having mostly similar characteristics (size ≈70-90nm, zeta potential ≈-50mV) were produced by both platforms, except for the payload where bulk mixing resulted in lower payload (65% versus 85%). The lower payload, however, resulted in its superior supersaturation generation. Nevertheless, millifluidics was favored attributed to its superior production consistency and scalability.
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Watson DC, Bayik D, Srivatsan A, Bergamaschi C, Valentin A, Niu G, Bear J, Monninger M, Sun M, Morales-Kastresana A, Jones JC, Felber BK, Chen X, Gursel I, Pavlakis GN. Efficient production and enhanced tumor delivery of engineered extracellular vesicles. Biomaterials 2016; 105:195-205. [PMID: 27522254 DOI: 10.1016/j.biomaterials.2016.07.003] [Citation(s) in RCA: 239] [Impact Index Per Article: 29.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Revised: 07/01/2016] [Accepted: 07/05/2016] [Indexed: 12/20/2022]
Abstract
Extracellular vesicles (EV), including exosomes and microvesicles, are nano-sized intercellular communication vehicles that participate in a multitude of physiological processes. Due to their biological properties, they are also promising candidates for the systemic delivery of therapeutic compounds, such as cytokines, chemotherapeutic drugs, siRNAs and viral vectors. However, low EV production yield and rapid clearance of administered EV by liver macrophages limit their potential use as therapeutic vehicles. We have used a hollow-fiber bioreactor for the efficient production of bioactive EV bearing the heterodimeric cytokine complex Interleukin-15:Interleukin-15 receptor alpha. Bioreactor culture yielded ∼40-fold more EV per mL conditioned medium, as compared to conventional cell culture. Biophysical analysis and comparative proteomics suggested a more diverse population of EV in the bioreactor preparations, while serum protein contaminants were detectable only in conventional culture EV preparations. We also identified the Scavenger Receptor Class A family (SR-A) as a novel monocyte/macrophage uptake receptor for EV. In vivo blockade of SR-A with dextran sulfate dramatically decreased EV liver clearance in mice, while enhancing tumor accumulation. These findings facilitate development of EV therapeutic methods.
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Affiliation(s)
- Dionysios C Watson
- Human Retrovirus Section, Vaccine Branch, Center for Cancer Research, National Cancer Institute at Frederick, Frederick, MD 21702, United States; Department of Medicine, University of Patras, Greece
| | - Defne Bayik
- Cancer and Inflammation Program, Center for Cancer Research, National Cancer Institute at Frederick, Frederick, MD 21702, United States; Department of Molecular Biology and Genetics, Bilkent University, Ankara, 06800 Turkey
| | - Avinash Srivatsan
- Laboratory of Molecular Imaging and Nanomedicine, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20892, United States
| | - Cristina Bergamaschi
- Human Retrovirus Pathogenesis Section, Vaccine Branch, Center for Cancer Research, National Cancer Institute at Frederick, Frederick, MD 21702, United States
| | - Antonio Valentin
- Human Retrovirus Section, Vaccine Branch, Center for Cancer Research, National Cancer Institute at Frederick, Frederick, MD 21702, United States
| | - Gang Niu
- Laboratory of Molecular Imaging and Nanomedicine, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20892, United States
| | - Jenifer Bear
- Human Retrovirus Pathogenesis Section, Vaccine Branch, Center for Cancer Research, National Cancer Institute at Frederick, Frederick, MD 21702, United States
| | - Mitchell Monninger
- Pathology Division, United States Army Medical Research Institute of Infectious Diseases, Frederick, MD 21702, United States
| | - Mei Sun
- Pathology Division, United States Army Medical Research Institute of Infectious Diseases, Frederick, MD 21702, United States
| | - Aizea Morales-Kastresana
- Vaccine Branch, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20892, United States
| | - Jennifer C Jones
- Vaccine Branch, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20892, United States
| | - Barbara K Felber
- Human Retrovirus Pathogenesis Section, Vaccine Branch, Center for Cancer Research, National Cancer Institute at Frederick, Frederick, MD 21702, United States
| | - Xiaoyuan Chen
- Laboratory of Molecular Imaging and Nanomedicine, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20892, United States
| | - Ihsan Gursel
- Department of Molecular Biology and Genetics, Bilkent University, Ankara, 06800 Turkey
| | - George N Pavlakis
- Human Retrovirus Section, Vaccine Branch, Center for Cancer Research, National Cancer Institute at Frederick, Frederick, MD 21702, United States.
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Rocha R, Santos RS, Madureira P, Almeida C, Azevedo NF. Optimization of peptide nucleic acid fluorescence in situ hybridization (PNA-FISH) for the detection of bacteria: The effect of pH, dextran sulfate and probe concentration. J Biotechnol 2016; 226:1-7. [PMID: 27021959 DOI: 10.1016/j.jbiotec.2016.03.047] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Revised: 03/23/2016] [Accepted: 03/24/2016] [Indexed: 01/17/2023]
Abstract
Fluorescence in situ hybridization (FISH) is a molecular technique widely used for the detection and characterization of microbial populations. FISH is affected by a wide variety of abiotic and biotic variables and the way they interact with each other. This is translated into a wide variability of FISH procedures found in the literature. The aim of this work is to systematically study the effects of pH, dextran sulfate and probe concentration in the FISH protocol, using a general peptide nucleic acid (PNA) probe for the Eubacteria domain. For this, response surface methodology was used to optimize these 3 PNA-FISH parameters for Gram-negative (Escherichia coli and Pseudomonas fluorescens) and Gram-positive species (Listeria innocua, Staphylococcus epidermidis and Bacillus cereus). The obtained results show that a probe concentration higher than 300nM is favorable for both groups. Interestingly, a clear distinction between the two groups regarding the optimal pH and dextran sulfate concentration was found: a high pH (approx. 10), combined with lower dextran sulfate concentration (approx. 2% [w/v]) for Gram-negative species and near-neutral pH (approx. 8), together with higher dextran sulfate concentrations (approx. 10% [w/v]) for Gram-positive species. This behavior seems to result from an interplay between pH and dextran sulfate and their ability to influence probe concentration and diffusion towards the rRNA target. This study shows that, for an optimum hybridization protocol, dextran sulfate and pH should be adjusted according to the target bacteria.
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Affiliation(s)
- Rui Rocha
- LEPABE, Department of Chemical Engineering, Faculty of Engineering of the University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal; Centre of Biological Engineering, University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal; Biomode, Ed. GNRATION, Praça Conde Agrolongo no 123, 4700-312 Braga, Portugal.
| | - Rita S Santos
- LEPABE, Department of Chemical Engineering, Faculty of Engineering of the University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal; Laboratory of General Biochemistry and Physical Pharmacy, Ghent University, Gent, Belgium; i3S, Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Porto, Portugal; IPATIMUP, Institute of Molecular Pathology and Immunology of the University of Porto, Porto, Portugal
| | - Pedro Madureira
- IBMC-Instituto de Biologia Molecular e Celular, Universidade do Porto, Rua do Campo Alegre n.° 823, 4150-180 Porto, Portugal; ICBAS-Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto, Rua de Jorge Viterbo Ferreira n.° 228, 4050-313 Porto, Portugal; i3S, Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Porto, Portugal
| | - Carina Almeida
- LEPABE, Department of Chemical Engineering, Faculty of Engineering of the University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal; Centre of Biological Engineering, University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal; Biomode, Ed. GNRATION, Praça Conde Agrolongo no 123, 4700-312 Braga, Portugal
| | - Nuno F Azevedo
- LEPABE, Department of Chemical Engineering, Faculty of Engineering of the University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
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Kulkarni AD, Vanjari YH, Sancheti KH, Patel HM, Belgamwar VS, Surana SJ, Pardeshi CV. New nasal nanocomplex self-assembled from charged biomacromolecules: N,N,N-Trimethyl chitosan and dextran sulfate. Int J Biol Macromol 2016; 88:476-90. [PMID: 27017981 DOI: 10.1016/j.ijbiomac.2016.03.045] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Revised: 03/21/2016] [Accepted: 03/22/2016] [Indexed: 01/17/2023]
Abstract
Although chitosan (CHT, a linear cationic polysaccharide) is biodegradable, biocompatible, non-toxic, and mucoadhesive in nature, the low solubility of CHT in aqueous and alkaline media limits its applicability in pharmaceutical and biomedical field. This necessitate the introduction of new chemically-modified derivatives of CHT those can surmount the solubility barrier. Herein, N,N,N-trimethyl chitosan (TMC), a quaternized hydrophilic derivative of CHT, was synthesized by two-step reductive methylation of CHT and characterized for (1)H NMR and zeta potential measurements. Polyelectrolyte complexes (PECs) based on TMC and dextran sulfate (DS) were prepared via ionic interactions between charged functional groups of former polysaccharides at different pH conditions (pH 5, 8, 10, and 12) and characterized for physicochemical (particle size and zeta potential) and solid- state characterizations (HR-TEM, SEM, FTIR, TGA and XRD). At alkaline pH conditions, the participant polymer chains (TMC and DS) are sufficiently close to form more stable PECs. The release efficiency was assessed after loading a model drug into optimized PEC formulation. Data indicated that the PECs fabricated at alkaline pH presents a reliable formulation for pharmaceutical and biomedical applications.
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Affiliation(s)
- Abhijeet D Kulkarni
- Industrial Pharmacy Laboratory, Department of Pharmaceutics, R.C. Patel Institute of Pharmaceutical Education and Research, Shirpur, Maharashtra, India
| | - Yogesh H Vanjari
- Industrial Pharmacy Laboratory, Department of Pharmaceutics, R.C. Patel Institute of Pharmaceutical Education and Research, Shirpur, Maharashtra, India
| | - Karan H Sancheti
- Industrial Pharmacy Laboratory, Department of Pharmaceutics, R.C. Patel Institute of Pharmaceutical Education and Research, Shirpur, Maharashtra, India
| | - Harun M Patel
- Department of Pharmaceutical Chemistry, R.C. Patel Institute of Pharmaceutical Education and Research, Shirpur, Maharashtra, India
| | - Veena S Belgamwar
- Department of Pharmaceutical Sciences, R.T.M. Nagpur University, Nagpur, Maharashtra, India
| | - Sanjay J Surana
- Industrial Pharmacy Laboratory, Department of Pharmaceutics, R.C. Patel Institute of Pharmaceutical Education and Research, Shirpur, Maharashtra, India
| | - Chandrakantsing V Pardeshi
- Industrial Pharmacy Laboratory, Department of Pharmaceutics, R.C. Patel Institute of Pharmaceutical Education and Research, Shirpur, Maharashtra, India.
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Park YH, Kim N, Shim YK, Choi YJ, Nam RH, Choi YJ, Ham MH, Suh JH, Lee SM, Lee CM, Yoon H, Lee HS, Lee DH. Adequate Dextran Sodium Sulfate-induced Colitis Model in Mice and Effective Outcome Measurement Method. J Cancer Prev 2015; 20:260-7. [PMID: 26734588 PMCID: PMC4699753 DOI: 10.15430/jcp.2015.20.4.260] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Revised: 12/11/2015] [Accepted: 12/12/2015] [Indexed: 12/21/2022] Open
Abstract
Background: Dextran sodium sulfate (DSS)-induced colitis mouse model is used for research of inflammatory bowel disease. The aim of this study was to establish the adequate conditions for DSS mice model, and to find useful tool to measure inflammation. Methods: The 2.5% DSS was administered to six male C57BL/6 mice and 4% DSS to eight mice at 5 or 9 weeks of age. Each group was consisted of 6 mice with control group in which vehicle was administered instead of DSS. The mice were sacrificed on the 7th day after DSS or vehicle administration. Body weight, diarrhea, and hematochezia were recorded daily. Disease activity index (DAI) score which was composed of body weight change, diarrhea, and hematochezia was measured every day. Colon length was measured after sacrifice and colon mucosal level of interleukin 1 beta (IL-1β) was measured by ELISA assay. Histological score was compared between ascending and descending colon in the DSS group. Results: Colon length of five- and nine-week DSS group was significantly shorter than each control group but there was no statistical significance depending on DSS concentration or age. DAI score of 4% DSS group in nine-week was significantly higher than that five-week (P = 0.012) but there was no difference between 2.5% and 4% DSS group. The level of IL-1β in DSS mice was much higher than control group (P < 0.01), but there was no difference among several DSS groups. The histological score was higher in the descending colon than in the ascending colon but there was no statistical difference between each pair of DSS groups. Conclusions: The 4% DSS mice in nine-week was adequate for DSS-induced colitis model. DAI score was useful tool and descending colon was more appropriate site for histological evaluation of colitis than ascending colon.
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Affiliation(s)
- Yo Han Park
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Seoul, Korea
| | - Nayoung Kim
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Seoul, Korea; Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, Korea
| | - Young Kwang Shim
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Seoul, Korea
| | - Yoon Jin Choi
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Seoul, Korea
| | - Ryoung Hee Nam
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Seoul, Korea
| | - Yoon Jeong Choi
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Seoul, Korea
| | - Min Hee Ham
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Seoul, Korea
| | - Ji Hyung Suh
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Seoul, Korea
| | - Sun Min Lee
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Seoul, Korea
| | - Chang Min Lee
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Seoul, Korea
| | - Hyuk Yoon
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Seoul, Korea
| | - Hye Seung Lee
- Department of Pathology, Seoul National University Bundang Hospital, Seongnam, Seoul, Korea
| | - Dong Ho Lee
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Seoul, Korea
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Costalat M, Alcouffe P, David L, Delair T. Macro-hydrogels versus nanoparticles by the controlled assembly of polysaccharides. Carbohydr Polym 2015; 134:541-6. [PMID: 26428156 DOI: 10.1016/j.carbpol.2015.07.071] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Revised: 07/17/2015] [Accepted: 07/21/2015] [Indexed: 11/20/2022]
Abstract
The controlled assembly of oppositely charged chitosan (CS, Mw ∼ 33 × 10(3) to 600 × 10(3)g mol(-1)) and dextran sulfate (DS, Mw = 1.3 × 10(6)g mol(-1)) or heparin (HP, Mw = 1.8 × 10(4)g mol(-1)) led either to nanoparticles or macro-hydrogels, at room temperature. The control over the electrostatic attractive interactions was achieved using 2 mol L(-1) NaCl in the polyion solutions and subsequent dialysis to let the assembly occur. Macrohydrogels formed with an excess of polyanion. In the presence of an excess of polycation, colloidal gels were exclusively obtained. At salt concentrations lower than 1 mol L(-1), the spontaneous gelation provided macro-hydrogels, whatever the polyion in excess. Rheology measurements showed a similar elastic behaviour for CS-DS and CS-HP hydrogels, though CS-HP hydrogels appeared less cohesive. SAXS experiments revealed an aggregate morphology with internal and surface structure depending on the degree of acetylation (DA) of chitosan.
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Yeom Y, Kim Y. The Sasa quelpaertensis Leaf Extract Inhibits the Dextran Sulfate Sodium-induced Mouse Colitis Through Modulation of Antioxidant Enzyme Expression. J Cancer Prev 2015; 20:136-46. [PMID: 26151047 PMCID: PMC4492358 DOI: 10.15430/jcp.2015.20.2.136] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2015] [Revised: 06/20/2015] [Accepted: 06/20/2015] [Indexed: 12/30/2022] Open
Abstract
Background: Oxidative stress plays an important role in the pathogenesis of inflammatory bowel disease. The objective of this study is to investigate the protective effect of Sasa quelpaertensis leaf extract (SQE) against oxidative stress in mice with dextran sulfate sodium (DSS)-induced colitis. Methods: Mice were treated with SQE (100 mg/kg or 300 mg/kg body weight) by gavage in advance two weeks before inflammation was induced. Then, the mice were administered with 2.5% DSS in drinking water for 7 days and normal drinking water for 7 days between two DSS treatment. Disease activity index values, gut motility, and severity of the resulting oxidative DNA damage were analyzed. The antioxidant effect of SQE was evaluated by measuring malondialdehyde (MDA) and superoxide dismutase (SOD) activity in plasma samples. Catalase activity and expressions levels of glutathione peroxidase 1 (Gpx1), SOD1, and SOD2 were also detected in colon tissues. Results: Administration of SQE significantly reduced the severity of DSS-induced colitis compared to the control (Ctrl) group. Levels of 8-oxo-dG, an oxidative DNA damage marker, were significantly lower in the SQE group compared to the untreated DSS Ctrl group. In the SQE (300 mg/kg) group, MDA levels were significantly lower, while SOD and catalase activity levels in the plasma samples were significantly higher compared with the DSS Ctrl group. The expression levels of the antioxidant enzymes, SOD2 and Gpx1, were significantly higher, while the levels of SOD 1 expression were lower, in the colon tissues of the DSS Ctrl group compared with those of the Ctrl group. In contrast, administration of SQE significantly down-regulated SOD2 and Gpx1 expressions and up-regulated SOD1 expression. Conclusions: These results indicate that SQE efficiently suppresses oxidative stress in DSS-induced colitis in mice, and its action is associated with the regulation of antioxidant enzymes.
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Affiliation(s)
- Yiseul Yeom
- Department of Nutritional Science and Food Management, College of Health Sciences, Ewha Womans University, Seoul, Korea
| | - Yuri Kim
- Department of Nutritional Science and Food Management, College of Health Sciences, Ewha Womans University, Seoul, Korea
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Vaishya RD, Mandal A, Gokulgandhi M, Patel S, Mitra AK. Reversible hydrophobic ion-paring complex strategy to minimize acylation of octreotide during long-term delivery from PLGA microparticles. Int J Pharm 2015; 489:237-45. [PMID: 25940041 DOI: 10.1016/j.ijpharm.2015.04.075] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Revised: 04/22/2015] [Accepted: 04/28/2015] [Indexed: 11/22/2022]
Abstract
Acylation of peptide has been reported for a number of peptides and proteins during release from polymers comprising of lactide and glycolide. We hypothesize that reversible hydrophobic ion-pairing (HIP) complex may minimize octreotide acylation during release. Sodium dodecyl sulfate (SDS), dextran sulfate A (DSA, Mw 9-20 kDa) and dextran sulfate B (DSB, Mw 36-50 kDa) were selected as ion-pairing agents to prepare reversible HIP complex with octreotide. Complexation efficiency was optimized with respect to the mole ratio of ion-pairing agent to octreotide to achieve 100% complexation of octreotide. Dissociation studies suggested that DSA-octreotide and DSB-octreotide complexes dissociate completely at physiological pH in presence of counter ions unlike SDS-octreotide complex. DSA-octreotide and DSB-octreotide complex encapsulated PLGA microparticles (DSAMPs and DSBMPs) were prepared using the S/O/W emulsion method. Entrapment efficiencies for DSAMPs and DSBMPs were 74.7±8.4% and 81.7±6.3%, respectively. In vitro release of octreotide was performed by suspending MPs in gel. A large fraction of peptide was released in chemically intact form and <7% was acylated from DSAMPs and DSBMPs in gel over 55 days. Therefore, HIP complexation could be a viable strategy to minimize acylation of peptides and proteins during extended release from lactide and glycolide based polymers.
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34
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Harman DG, Gorkin R 3rd, Stevens L, Thompson B, Wagner K, Weng B, Chung JH, In Het Panhuis M, Wallace GG. Poly(3,4-ethylenedioxythiophene): dextran sulfate (PEDOT:DS) - a highly processable conductive organic biopolymer. Acta Biomater 2015; 14:33-42. [PMID: 25484333 DOI: 10.1016/j.actbio.2014.11.049] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Revised: 11/24/2014] [Accepted: 11/26/2014] [Indexed: 01/20/2023]
Abstract
A novel water-dispersible conducting polymer analogous to poly(3,4-dioxythiophene):polystyrene sulfonate (PEDOT:PSS) has been chemically synthesized in a single reaction in high yield. PEDOT:DS, a new member of the polythiophene family, is composed of a complex between PEDOT and the sulfonated polysaccharide polyanion dextran sulfate. Drop-cast films of aqueous suspensions of the material display a native conductivity of up to 7 ± 1 S cm(-1), increasing to 20 ± 2 S cm(-1) after treatment with ethylene glycol and thermal annealing. Mass ratios of the precursors NaDS and EDOT were varied from 5:1 to 2:1 and a decrease in the NaDS:EDOT ratio produces tougher, less hygroscopic films of higher conductivity. Ultraviolet-visible spectroelectrochemistry yields spectra typical of PEDOT complexes. Cyclic voltammetry reveals that PEDOT:DS is electrochemically active from -1.0 to 0.8 V vs. Ag/Ag(+) in acetonitrile, with similar characteristics to PEDOT:PSS. Water dispersions of PEDOT:DS are successfully processed by drop casting, spray coating, inkjet printing and extrusion printing. Furthermore, laser etching of dried films allows the creation of patterns with excellent definition. To assess the cytotoxicity of PEDOT:DS, L-929 cells were cultured with a polymer complex concentration range of 0.002 to 0.2 g l(-1) in cell culture medium. No significant difference is found between the proliferation rates of L-929 cells exposed to PEDOT:DS and those in plain medium after 96h. However, PEDOT:PSS shows around 25% less cell growth after 4 days, even at the lowest concentration. Taken together, these results suggest PEDOT:DS has exceptional potential as an electromaterial for the biointerface.
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35
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Yamada H, Nagao C, Haredy AM, Mori Y, Mizuguchi K, Yamanishi K, Okamoto S. Dextran sulfate-resistant A/Puerto Rico/8/34 influenza virus is associated with the emergence of specific mutations in the neuraminidase glycoprotein. Antiviral Res 2014; 111:69-77. [PMID: 25234090 DOI: 10.1016/j.antiviral.2014.09.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2014] [Revised: 09/02/2014] [Accepted: 09/07/2014] [Indexed: 11/28/2022]
Abstract
Dextran sulfate (DS) is a negatively charged sulfated polysaccharide that suppresses the replication of influenza A viruses. The suppression was thought to be associated with inhibition of the hemagglutinin-dependent fusion activity. However, we previously showed that suppression by DS was observed not only at the initial stage of viral infection, but also later when virus is released from infected cells due to inhibition of neuraminidase (NA) activity. In the present study, we isolated DS-resistant A/Puerto Rico/8/34 (PR8) influenza viruses and analyzed the inhibition by DS. We found six mutations in NA genes of five independent resistant PR8 viruses and each resistant NA gene had two mutations. All mutations were from basic to acidic or neutral amino acids. In addition, R430L, K432E or K435E in the 430-435 region was a common mutation in all resistant NA genes. To determine which amino acid(s) are responsible for this resistance, a panel of recombinant viruses containing a PR8 and A/WSN/33(WSN) chimeric NA gene or an NA gene with different mutation(s) was generated using reverse genetics. Using recombinant viruses containing a PR8/WSN chimeric NA, we showed that one third of the C-terminal region of PR8 NA was responsible for DS-sensitivity. Recombinant viruses with a single mutation in NA replicated better than wild-type PR8 in the presence of DS, but were still DS-sensitive. However, replication of recombinant viruses with double mutations from the resistant viruses was not affected by the presence or absence of DS. In addition, resistant recombinant viruses were found to be sensitive to the NA inhibitor, oseltamivir and the oseltamivir-resistant recombinant virus was sensitive to DS. These results suggested that DS is an NA inhibitor with a different mechanism of action from the currently used NA inhibitors and that DS could be used in combination with these inhibitors to treat influenza virus infections.
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Affiliation(s)
- Hiroshi Yamada
- Laboratory of Virology and Vaccinology, Division of Biomedical Research, National Institute of Biomedical Innovation, Ibaraki, Osaka, Japan.
| | - Chioko Nagao
- National Institute of Biomedical Innovation, Ibaraki, Osaka, Japan
| | - Ahmad M Haredy
- Laboratory of Virology and Vaccinology, Division of Biomedical Research, National Institute of Biomedical Innovation, Ibaraki, Osaka, Japan
| | - Yasuko Mori
- Division of Clinical Virology, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Kenji Mizuguchi
- National Institute of Biomedical Innovation, Ibaraki, Osaka, Japan
| | - Koichi Yamanishi
- Laboratory of Virology and Vaccinology, Division of Biomedical Research, National Institute of Biomedical Innovation, Ibaraki, Osaka, Japan
| | - Shigefumi Okamoto
- Laboratory of Virology and Vaccinology, Division of Biomedical Research, National Institute of Biomedical Innovation, Ibaraki, Osaka, Japan
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36
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Jing Y, Zhang C, Fu T, Jiang C, Ma K, Zhang D, Hou S, Dai J, Wang H, Zhang X, Kou G, Guo Y. Combination of dextran sulfate and recombinant trypsin on aggregation of Chinese hamster ovary cells. Cytotechnology 2014; 68:241-8. [PMID: 25087075 DOI: 10.1007/s10616-014-9774-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Accepted: 07/16/2014] [Indexed: 10/24/2022] Open
Abstract
In laboratory scale therapeutical protein production, cell clumps form typically in shake flasks, which hinders cell growth and decreases protein yield. To minimize clumps during the culture of Chinese hamster ovary cells, we employed the combination of two reagents, dextran sulfate (DS) and recombinant trypsin (r-trypsin). Our results showed that both DS and r-trypsin could diminish cell aggregation when adding them respectively, but clumps were still noticed obviously. In order to further mitigate cell agglomerate, a combination of 1.2 g/L DS and 8.0 mg/L r-trypsin was employed and no clumps were found under the bright field microscope. Strikingly, the highest viable cell density of combination group was increased from 5.12 × 10(6) to 7.13 × 10(6) cells/mL, while the integral of viable cells concentration was raised from 35.13 × 10(6) to 60.87 × 10(6) cells·days/mL, and the culture period was prolonged by 4 days. In addition, the antibody integrity was maintained in the combination group compared with that of the control.
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Affiliation(s)
- Yu Jing
- International Joint Cancer Institute, The Second Military Medical University, Shanghai, 200433, China.,State Key Laboratory of Antibody Medicine and Target Therapy, Shanghai, 201203, China.,National Engineering Research Center for Antibody Medicine and Shanghai Key Laboratory of Cell Engineering and Antibody, Shanghai, 201203, China.,Institutes of Biology and Medical Sciences, Soochow University, Suzhou, 215123, China
| | - Cunchao Zhang
- International Joint Cancer Institute, The Second Military Medical University, Shanghai, 200433, China.,State Key Laboratory of Antibody Medicine and Target Therapy, Shanghai, 201203, China.,National Engineering Research Center for Antibody Medicine and Shanghai Key Laboratory of Cell Engineering and Antibody, Shanghai, 201203, China
| | - Tuo Fu
- International Joint Cancer Institute, The Second Military Medical University, Shanghai, 200433, China.,State Key Laboratory of Antibody Medicine and Target Therapy, Shanghai, 201203, China.,National Engineering Research Center for Antibody Medicine and Shanghai Key Laboratory of Cell Engineering and Antibody, Shanghai, 201203, China
| | - Cheng Jiang
- International Joint Cancer Institute, The Second Military Medical University, Shanghai, 200433, China.,State Key Laboratory of Antibody Medicine and Target Therapy, Shanghai, 201203, China.,National Engineering Research Center for Antibody Medicine and Shanghai Key Laboratory of Cell Engineering and Antibody, Shanghai, 201203, China
| | - Kai Ma
- International Joint Cancer Institute, The Second Military Medical University, Shanghai, 200433, China.,State Key Laboratory of Antibody Medicine and Target Therapy, Shanghai, 201203, China.,National Engineering Research Center for Antibody Medicine and Shanghai Key Laboratory of Cell Engineering and Antibody, Shanghai, 201203, China
| | - Dapeng Zhang
- International Joint Cancer Institute, The Second Military Medical University, Shanghai, 200433, China.,State Key Laboratory of Antibody Medicine and Target Therapy, Shanghai, 201203, China.,National Engineering Research Center for Antibody Medicine and Shanghai Key Laboratory of Cell Engineering and Antibody, Shanghai, 201203, China
| | - Sheng Hou
- International Joint Cancer Institute, The Second Military Medical University, Shanghai, 200433, China.,State Key Laboratory of Antibody Medicine and Target Therapy, Shanghai, 201203, China.,National Engineering Research Center for Antibody Medicine and Shanghai Key Laboratory of Cell Engineering and Antibody, Shanghai, 201203, China
| | - Jianxin Dai
- International Joint Cancer Institute, The Second Military Medical University, Shanghai, 200433, China.,State Key Laboratory of Antibody Medicine and Target Therapy, Shanghai, 201203, China.,National Engineering Research Center for Antibody Medicine and Shanghai Key Laboratory of Cell Engineering and Antibody, Shanghai, 201203, China
| | - Hao Wang
- International Joint Cancer Institute, The Second Military Medical University, Shanghai, 200433, China.,State Key Laboratory of Antibody Medicine and Target Therapy, Shanghai, 201203, China.,National Engineering Research Center for Antibody Medicine and Shanghai Key Laboratory of Cell Engineering and Antibody, Shanghai, 201203, China
| | - Xueguang Zhang
- Institutes of Biology and Medical Sciences, Soochow University, Suzhou, 215123, China
| | - Geng Kou
- International Joint Cancer Institute, The Second Military Medical University, Shanghai, 200433, China. .,State Key Laboratory of Antibody Medicine and Target Therapy, Shanghai, 201203, China. .,National Engineering Research Center for Antibody Medicine and Shanghai Key Laboratory of Cell Engineering and Antibody, Shanghai, 201203, China.
| | - Yajun Guo
- International Joint Cancer Institute, The Second Military Medical University, Shanghai, 200433, China. .,State Key Laboratory of Antibody Medicine and Target Therapy, Shanghai, 201203, China. .,National Engineering Research Center for Antibody Medicine and Shanghai Key Laboratory of Cell Engineering and Antibody, Shanghai, 201203, China. .,Institutes of Biology and Medical Sciences, Soochow University, Suzhou, 215123, China.
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Costalat M, Alcouffe P, David L, Delair T. Controlling the complexation of polysaccharides into multi-functional colloidal assemblies for nanomedicine. J Colloid Interface Sci 2014; 430:147-56. [PMID: 24998067 DOI: 10.1016/j.jcis.2014.05.039] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Revised: 05/14/2014] [Accepted: 05/17/2014] [Indexed: 12/25/2022]
Abstract
The controlled assembly of oppositely charged polysaccharides led to colloids stable in physiological media, capable of encapsulating a molecular drug and of sorbing proteins at their interface. Two types of particles were obtained: both chitosan-dextran sulfate (CS-DS) and chitosan-heparin (CS-HP) stable over 30 days in PBS at 25 and 37°C. At gastric pH 1.2, these particles remained stable over 3 days, enough for a stomach transit. The structural analysis by small angle X-ray scattering (SAXS) showed that CS-DS surface was semi-rough and chains inside particle exhibited rod-like conformation. Moreover, the particle interfaces could efficiently be functionalized with anti-OVA or anti-α4β7 antibodies, in PBS, with the conservation of the antibody bioactivity over at least 8 days. Finally, during the assembly process, a molecular model drug, AMP, could be encapsulated with a loading efficiency up to 72% for CS-DS particles and 66% for CS-HP. All these data establish that the controlled assembly process under equilibrium conditions lead to colloids well suited for the targeted nanodelivery of drugs.
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Affiliation(s)
- M Costalat
- Ingénierie des Matériaux Polymères, Université de Lyon, Université Lyon 1, UMR CNRS 5223 IMP, 15, Bd, A. Latarjet, Bât. Polytech, 69622 Villeurbanne Cedex, France
| | - P Alcouffe
- Ingénierie des Matériaux Polymères, Université de Lyon, Université Lyon 1, UMR CNRS 5223 IMP, 15, Bd, A. Latarjet, Bât. Polytech, 69622 Villeurbanne Cedex, France
| | - L David
- Ingénierie des Matériaux Polymères, Université de Lyon, Université Lyon 1, UMR CNRS 5223 IMP, 15, Bd, A. Latarjet, Bât. Polytech, 69622 Villeurbanne Cedex, France
| | - T Delair
- Ingénierie des Matériaux Polymères, Université de Lyon, Université Lyon 1, UMR CNRS 5223 IMP, 15, Bd, A. Latarjet, Bât. Polytech, 69622 Villeurbanne Cedex, France.
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Kim K, Lee S, Ryu S, Han D. Efficient isolation and elution of cellular proteins using aptamer-mediated protein precipitation assay. Biochem Biophys Res Commun 2014; 448:114-9. [PMID: 24768638 DOI: 10.1016/j.bbrc.2014.04.086] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2014] [Accepted: 04/16/2014] [Indexed: 11/21/2022]
Abstract
Protein precipitation is one of the most widely used methods for antigen detection and purification in biological research. We developed a reproducible aptamer-mediated magnetic protein precipitation method that is able to efficiently capture, purify and isolate the target proteins. We discovered DNA aptamers having individually high affinity and specificity against human epidermal growth factor receptor (EGFR) and human insulin receptor (INSR). Using aptamers and magnetic beads, we showed it is highly efficient technique to enrich endogenous proteins complex and is applicable to identify physiologically relevant protein-protein interactions with minimized nonspecific binding of proteins. The results presented here indicate that aptamers would be applicable as a useful and cost-effective tool to identify the presence of the particular target protein with their specific protein partners.
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Tiyaboonchai W, Rodleang I, Ounaroon A. Mucoadhesive polyethylenimine- dextran sulfate nanoparticles containing Punica granatum peel extract as a novel sustained-release antimicrobial. Pharm Dev Technol 2014; 20:426-32. [PMID: 24438035 DOI: 10.3109/10837450.2013.879884] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Mucoadhesive polyethylenimine-dextran sulfate nanoparticles (PDNPs) were developed for local oral mucosa delivery. Punica granatum peel extract (PGE) was loaded into PDNPs for oral malodor reduction and caries prevention. PDNPs were constructed using the polyelectrolyte complexation technique employing oppositely charged polymers polyethylenimine (PEI) and dextran sulfate (DS), with PEG 400 as a stabilizer. Under optimal conditions, spherical particles of ∼ 500 nm with a zeta potential of ∼+28 mV were produced. Up to 98%, drug entrapment efficiency was observed. The mass ratio of PEI:DS played a significant role in controlling particle size and entrapment efficacy. PDNPs shown to be a good mucoadhesive drug delivery system as confirmed by ex vivo wash off test. In vitro dissolution studies revealed that PGE-loaded PDNPs manifested a prolong release characteristic with a burst release within 5 min. In addition, they remained effectively against oral bacteria.
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Affiliation(s)
- Waree Tiyaboonchai
- Department of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, Naresuan University , Phitsanulok , Thailand
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You DG, Saravanakumar G, Son S, Han HS, Heo R, Kim K, Kwon IC, Lee JY, Park JH. Dextran sulfate-coated superparamagnetic iron oxide nanoparticles as a contrast agent for atherosclerosis imaging. Carbohydr Polym 2013; 101:1225-33. [PMID: 24299895 DOI: 10.1016/j.carbpol.2013.10.068] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Revised: 09/16/2013] [Accepted: 10/21/2013] [Indexed: 01/14/2023]
Abstract
The hallmark of atherosclerosis in its early pathogenic process is the overexpression of class A scavenger receptors (SR-A) by activated macrophages. In this study, dextran sulfate-coated superparamagnetic iron oxide nanoparticles (DS-SPIONs), as a magnetic resonance (MR) imaging contrast agent of atherosclerosis, was prepared via the facile co-precipitation method using a versatile double-hydrophilic block copolymer comprising of a DS segment (ligand for SR-A) and a poly(glyclerol methacrylate) segment (SPIONs surface-anchoring unit). The physicochemical properties of the DS-SPIONs were investigated using various instruments. DS-SPIONs exhibited high aqueous stability compared to dextran-coated SPIONs (Dex-SPIONs), which were used as controls. The cellular uptake behaviors of DS-SPIONs and Dex-SPIONs were evaluated using Prussian blue assay. Interestingly, the DS-SPIONs were effectively taken up by activated macrophages compared to Dex-SPIONs. However, the cellular uptake of DS-SPIONs by activated macrophages was remarkably reduced in the presence of free DS. These results suggest that activated macrophages internalize DS-SPIONs via receptor (SR-A)-mediated endocytosis. T2-weighted MR imaging of the cells demonstrated that activated macrophages treated with DS-SPIONs showed a significantly lower signal intensity compared to those treated with Dex-SPIONs. Overall, these results suggest that DS-SPIONs may be utilized as a potential contrast agent for atherosclerosis MR imaging.
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Affiliation(s)
- Dong Gil You
- Departments of Polymer Science and Chemical Engineering, College of Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea; Center for Theragnosis, Biomedical Research Institute, Korea Institute of Science and Technology (KIST), Hwarangno 14-gil 6, Seongbuk-gu, Seoul 136-791, Republic of Korea
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Semenyuk PI, Muronetz VI, Haertlé T, Izumrudov VA. Effect of poly(phosphate) anions on glyceraldehyde-3-phosphate dehydrogenase structure and thermal aggregation: comparison with influence of poly(sulfoanions). Biochim Biophys Acta Gen Subj 2013; 1830:4800-5. [PMID: 23811344 DOI: 10.1016/j.bbagen.2013.06.024] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2013] [Revised: 06/09/2013] [Accepted: 06/17/2013] [Indexed: 11/26/2022]
Abstract
BACKGROUND It is well documented that poly(sulfate) and poly(sulfonate) anions suppress protein thermal aggregation much more efficiently than poly(carboxylic) anions, but as a rule, they denature protein molecules. In this work, a polymer of different nature, i.e. poly(phosphate) anion (PP) was used to elucidate the influence of phosphate groups on stability and thermal aggregation of the model enzyme glyceraldehyde-3-phosphate dehydrogenase (GAPDH). METHODS Isothermal titration calorimetry and differential scanning calorimetry were used for studying the protein-polyanion interactions and the influence of bound polyanions on the protein structure. The enzymatic activity of GAPDH and size of the complexes were measured. The aggregation level was determined from the turbidity. RESULTS Highly polymerized PP chains were able to suppress the aggregation completely, but at significantly higher concentrations as compared with poly(styrenesulfonate) (PSS) or dextran sulfate chains of the same degree of polymerization. The effect of PP on the enzyme structure and activity was much gentler as opposed to the binding of dextran sulfate or, especially, PSS that denatured GAPDH molecules with the highest efficacy caused by short PSS chains. These findings agreed well with the enhanced affinity of polysulfoanions to GAPDH. CONCLUSIONS The revealed trends might help to illuminate the mechanism of control of proteins functionalities by insertion of charged groups of different nature through posttranslational modifications. GENERAL SIGNIFICANCE Practical implementation of the results could be the use of PP chains as promising tools to suppress the proteins aggregation without noticeable loss in the enzymatic activity.
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Affiliation(s)
- Pavel I Semenyuk
- Belozersky Institute of Physico-Chemical Biology, Moscow, Russia.
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