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Afraei F, Daneshjou S, Dabirmanesh B. Synthesis and evaluation of nanosystem containing chondroitinase ABCI based on hydroxyapatite. AMB Express 2024; 14:23. [PMID: 38353777 PMCID: PMC10866842 DOI: 10.1186/s13568-024-01677-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Accepted: 01/31/2024] [Indexed: 02/17/2024] Open
Abstract
The bacterial enzyme chondroitinase ABCI (chABCI), which has been isolated from Proteus Vulgaris, is crucial in the treatment of spinal cord injuries. However, due to its short lifespan, the maintenance and clinical application of this enzyme are very constrained. In this study, the immobilization of this enzyme on hydroxyapatite has been carried out and assessed with the aim of enhancing the characteristics and efficiency of chABCI. Hydroxyapatite particles (HAPs) are a potential candidate for drug-delivery carriers because of their excellent biocompatibility, shape controllability, and high adsorption. The use of the nanometer scale allows efficient access to the enzyme's substrate. It demonstrates important biological application capabilities in this way. Field emission gun-scanning electron microscopy (FEG-SEM), X-ray diffraction (XRD), infrared spectroscopy (FT-IR), in vitro release study, and cytotoxicity test were used to characterize the drug nanosystem's properties. According to the findings, electrostatic bindings was formed between charged groups of the enzyme and hydroxyapatite nanoparticles. The results also demonstrated that immobilized chABCI on hydroxyapatite has beneficial properties, such as more manageable drug release, minimal toxicity and side effects, and a high potential to enhance the efficacy of drug delivery and decrease the need for repeated injections.
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Affiliation(s)
- Fatemeh Afraei
- Department of Nanobiotechnology, Faculty of Biological Science, Tarbiat Modares University, Tehran, Iran
| | - Sara Daneshjou
- Department of Nanobiotechnology, Faculty of Biological Science, Tarbiat Modares University, Tehran, Iran.
| | - Bahareh Dabirmanesh
- Department of Biochemistry, Faculty of Biological Science, Tarbiat Modares University, Tehran, Iran
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Kheirollahi A, Sadeghi S, Orandi S, Moayedi K, Khajeh K, Khoobi M, Golestani A. Chondroitinase as a therapeutic enzyme: Prospects and challenges. Enzyme Microb Technol 2024; 172:110348. [PMID: 37898093 DOI: 10.1016/j.enzmictec.2023.110348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Revised: 09/28/2023] [Accepted: 10/19/2023] [Indexed: 10/30/2023]
Abstract
The chondroitinases (Chase) are bacterial lyases that specifically digest chondroitin sulfate and/or dermatan sulfate glycosaminoglycans via a β-elimination reaction and generate unsaturated disaccharides. In recent decades, these enzymes have attracted the attention of many researchers due to their potential applications in various aspects of medicine from the treatment of spinal cord injury to use as an analytical tool. In spite of this diverse spectrum, the application of Chase is faced with several limitations and challenges such as thermal instability and lack of a suitable delivery system. In the current review, we address potential therapeutic applications of Chase with emphasis on the challenges ahead. Then, we summarize the latest achievements to overcome the problems by considering the studies carried out in the field of enzyme engineering, drug delivery, and combination-based therapy.
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Affiliation(s)
- Asma Kheirollahi
- Department of Comparative Biosciences, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
| | - Solmaz Sadeghi
- Department of Medical Biotechnology, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Shirin Orandi
- Department of Clinical Biochemistry, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Kiana Moayedi
- Department of Clinical Biochemistry, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Khosro Khajeh
- Department of Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, Tehran 14115-154, Iran
| | - Mehdi Khoobi
- Department of Radiopharmacy, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran; Department of Pharmaceutical Biomaterials and Medical Biomaterials Research Center, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
| | - Abolfazl Golestani
- Department of Clinical Biochemistry, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran.
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Hassanli A, Daneshjou S, Dabirmanesh B, Khajeh K. Improvement of thermal-stability of chondroitinase ABCI immobilized on graphene oxide for the repair of spinal cord injury. Sci Rep 2023; 13:18220. [PMID: 37880390 PMCID: PMC10600109 DOI: 10.1038/s41598-023-45555-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Accepted: 10/20/2023] [Indexed: 10/27/2023] Open
Abstract
Spinal cord injury healing has been shown to be aided by chondroitinase ABC I (cABCI) treatment. The transport of cABCI to target tissues is complicated by the enzyme's thermal instability; however, cABCI may be immobilized on nanosheets to boost stability and improve delivery efficiency. This investigation's goal was to assess the immobilization of cABC I on graphene oxide (GO). for this purpose, GO was produced from graphene using a modified version of Hummer's process. the immobilization of cABC I on GO was examined using SEM, XRD, and FTIR. The enzymatic activity of cABC I was evaluated in relation to substrate concentration. The enzyme was then surface-adsorption immobilized on GO, and its thermal stability was examined. As compared to the free enzyme, the results showed that the immobilized enzyme had a greater Km and a lower Vmax value. The stability of the enzyme was greatly improved by immobilization at 20, 4, 25, and 37 °C. For example, at 37 °C, the free enzyme retained 5% of its activity after 100 min, while the immobilized one retained 30% of its initial activity. The results showed, As a suitable surface for immobilizing cABC I, GO nano sheets boost the enzyme's stability, improving its capability to support axonal regeneration after CNC damage and guard against fast degradation.
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Affiliation(s)
- Atefeh Hassanli
- Department of Nanobiotechnology, Faculty of Biological Science, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran
| | - Sara Daneshjou
- Department of Nanobiotechnology, Faculty of Biological Science, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran.
| | - Bahareh Dabirmanesh
- Department of Biochemistry, Faculty of Biological Science, Tarbiat Modares University, Tehran, Iran
| | - Khosro Khajeh
- Department of Biochemistry, Faculty of Biological Science, Tarbiat Modares University, Tehran, Iran
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4
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Small interfering RNA (siRNA) to target genes and molecular pathways in glioblastoma therapy: Current status with an emphasis on delivery systems. Life Sci 2021; 275:119368. [PMID: 33741417 DOI: 10.1016/j.lfs.2021.119368] [Citation(s) in RCA: 62] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Revised: 03/11/2021] [Accepted: 03/12/2021] [Indexed: 02/08/2023]
Abstract
Glioblastoma multiforme (GBM) is one of the worst brain tumors arising from glial cells, causing many deaths annually. Surgery, chemotherapy, radiotherapy and immunotherapy are used for GBM treatment. However, GBM is still an incurable disease, and new approaches are required for its successful treatment. Because mutations and amplifications occurring in several genes are responsible for the progression and aggressive behavior of GBM cells, genetic approaches are of great importance in its treatment. Small interfering RNA (siRNA) is a new emerging tool to silence the genes responsible for disease progression, particularly cancer. SiRNA can be used for GBM treatment by down-regulating genes such as VEGF, STAT3, ELTD1 or EGFR. Furthermore, the use of siRNA can promote the chemosensitivity of GBM cells. However, the efficiency of siRNA in GBM is limited via its degradation by enzymes, and its off-targeting effects. SiRNA-loaded carriers, especially nanovehicles that are ligand-functionalized by CXCR4 or angiopep-2, can be used for the protection and targeted delivery of siRNA. Nanostructures can provide a platform for co-delivery of siRNA plus anti-tumor drugs as another benefit. The prepared nanovehicles should be stable and biocompatible in order to be tested in human studies.
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Daneshjou S, Dabirmanesh B, Rahimi F, Jabbari S, Khajeh K. Catalytic parameters and thermal stability of chondroitinase ABCI on red porous silicon nanoparticles. J Biotechnol 2020; 324:83-90. [PMID: 32979433 DOI: 10.1016/j.jbiotec.2020.09.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 08/02/2020] [Accepted: 09/21/2020] [Indexed: 12/21/2022]
Abstract
The bacterial enzyme chondroitinase ABC, which digests extracellular chondroitin sulfate proteoglycans, has been shown to enhance axonal regeneration. However, the utilization of this enzyme as therapeutics is notably restricted due to its thermal instability. Therefore, red luminescent porous silicon that hold promise for potential applications in biological/medical imaging was used as a carrying matrix for chondroitinase with the aim of enhancing its stability. Porous Si nanoparticles were prepared by electrochemical etching of silicon wafers in ethanolic HF solution. The size of nanoparticles (210 nm) and the mean pore diameter (8 -20 nm) were determined using dynamic light scattering and scanning electron microscopy. Purified chondroitinase was then incorporated into the silicon pores. Results revealed similar Km and lower Vmax value for the immobilized enzyme when compared with the free enzyme. The immobilized chondroitinase exhibited about a 4 fold increase in stability at 37 °C after 50 min. It is likely possible that, the enzyme was protected inside the pores resulted in higher stability. Moreover, porous silicon was seen to be capable of holding the chondroitinase for repeated cyclic tests for three times. The cell viability assay exhibited no significant cytotoxicity for Psi-chondroitinase up to 24 h.
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Affiliation(s)
- Sara Daneshjou
- Tarbiat Modares University, Faculty of Biological Science, Tehran, Iran.
| | | | - Fereshteh Rahimi
- University of Tehran, Faculty of New Sciences and Technologies, Tehran, Iran
| | - Safoura Jabbari
- Tarbiat Modares University, Faculty of Biological Science, Tehran, Iran
| | - Khosro Khajeh
- Tarbiat Modares University, Faculty of Biological Science, Tehran, Iran
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Alabbas A, Desai UR. Enzyme immobilization offers a robust tool to scale up the production of longer, diverse, natural glycosaminoglycan oligosaccharides. Glycobiology 2020; 30:768-773. [PMID: 32193533 DOI: 10.1093/glycob/cwaa027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Revised: 03/15/2020] [Accepted: 03/18/2020] [Indexed: 11/14/2022] Open
Abstract
Although structurally diverse, longer glycosaminoglycan (GAG) oligosaccharides are critical to understand human biology, few are available. The major bottleneck has been the predominant production of oligosaccharides, primarily disaccharides, upon enzymatic depolymerization of GAGs. In this work, we employ enzyme immobilization to prepare hexasaccharide and longer sequences of chondroitin sulfate in good yields with reasonable homogeneity. Immobilized chondroitinase ABC displayed good efficiency, robust operational pH range, broad thermal stability, high recycle ability and excellent distribution of products in comparison to the free enzyme. Diverse sequences could be chromatographically resolved into well-defined peaks and characterized using LC-MS. Enzyme immobilization technology could enable easier access to diverse longer GAG sequences.
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Affiliation(s)
- Alhumaidi Alabbas
- Institute for Structural Biology, Drug Discovery and Development, Virginia Commonwealth University, Richmond, VA 23219, USA.,Department of Medicinal Chemistry, Virginia Commonwealth University, Richmond, VA 23298, USA.,Department of Pharmaceutical Chemistry, Prince Sattam Bin Abdulaziz University, Alkharj 11942, Saudi Arabia
| | - Umesh R Desai
- Institute for Structural Biology, Drug Discovery and Development, Virginia Commonwealth University, Richmond, VA 23219, USA.,Department of Medicinal Chemistry, Virginia Commonwealth University, Richmond, VA 23298, USA
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Askaripour H, Vossoughi M, Khajeh K, Alemzadeh I. Examination of chondroitinase ABC I immobilization onto dextran-coated Fe 3O 4 nanoparticles and its in-vitro release. J Biotechnol 2020; 309:131-141. [PMID: 31935418 DOI: 10.1016/j.jbiotec.2019.12.020] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2019] [Revised: 12/21/2019] [Accepted: 12/30/2019] [Indexed: 01/22/2023]
Abstract
Chondroitinase ABC I (cABC I) has received notable attention in treatment of spinal cord injuries and its application as therapeutics has been limited due to low thermal stability at physiological temperature. In this study, cABC I enzyme was immobilized on the dextran-coated Fe3O4 nanoparticles through physical adsorption to improve the thermal stability. The nanoparticles were characterized using XRD, SEM, VSM, and FTIR analyses. Response surface methodology and central composite design were employed to assess factors affecting the activity of immobilized cABC I. Experimental results showed that pH 6.3, temperature 24 °C, enzyme/support mass ratio 1.27, and incubation time 5.7 h were the optimal immobilization conditions. It was found that thermal stability of immobilized cABC I was significantly improved. In-vitro cABC I release was studied under pH 7.5 and temperature 37 °C and the results indicated that 70 % release occurred after 9 h and the release mechanism was first-order kinetic model.
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Affiliation(s)
- Hossein Askaripour
- Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran.
| | - Manouchehr Vossoughi
- Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran.
| | - Khosro Khajeh
- Department of Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran.
| | - Iran Alemzadeh
- Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran.
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Rezaei S, Dabirmanesh B, Zare L, Golestani A, Javan M, Khajeh K. Enhancing myelin repair in experimental model of multiple sclerosis using immobilized chondroitinase ABC I on porous silicon nanoparticles. Int J Biol Macromol 2019; 146:162-170. [PMID: 31899243 DOI: 10.1016/j.ijbiomac.2019.12.258] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 12/19/2019] [Accepted: 12/30/2019] [Indexed: 12/27/2022]
Abstract
Removal of chondroitin sulfate proteoglycans (CSPGs) with chondroitinase ABC I (ChABC) facilitates axonal plasticity, axonal regeneration and remyelination, following injury to the central nervous system (CNS). However, the ChABC rapidly undergoes thermal inactivity and needs to be injected repeatedly. Here this limitation was overcame by immobilizing the ChABC on porous silicon (PSi) nanoparticles (ChABC@PSi). The efficacy of immobilized ChABC on CSPGs level and the demyelination insult was assessed in mice corpora callosa demyelinated by 6 weeks cuprizone (CPZ) feeding. ChABC@PSi was able to reduce the amount of CSPGs two weeks after animals treatment. CSPGs digestion by ChABC@PSi reduced the extent of demyelinated area as well as the astrogliosis. Furthermore, ChABC@PSi treatment increased the number of newly generated oligodendrocyte lineage cells which imply for enhanced myelin repair. Our results showed that effective CSPGs digestion by ChABC@PSi enhanced remyelination in CPZ model. Accordingly, ChABC@PSi may have a great potential to be used for treatment of diseases like multiple sclerosis and spinal cord injury by promoting the regeneration of damaged nerves.
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Affiliation(s)
- Safoura Rezaei
- Department of Nanobiotechnology, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran
| | - Bahareh Dabirmanesh
- Department of Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran
| | - Leila Zare
- Department of Physiology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Abolfazl Golestani
- Department of Clinical Biochemistry, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Mohammad Javan
- Department of Physiology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran; Department of Brain and Cognitive Sciences, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR, Tehran, Iran.
| | - Khosro Khajeh
- Department of Nanobiotechnology, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran; Department of Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran.
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Askaripour H, Vossoughi M, Khajeh K, Alemzadeh I. Magnetite nanoparticle as a support for stabilization of chondroitinase ABCI. ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY 2019; 47:2721-2728. [DOI: 10.1080/21691401.2019.1577879] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Hossein Askaripour
- Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran
| | - Manouchehr Vossoughi
- Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran
| | - Khosro Khajeh
- Department of Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran
| | - Iran Alemzadeh
- Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran
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10
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Inhibition assays of free and immobilized urease for detecting hexavalent chromium in water samples. 3 Biotech 2019; 9:124. [PMID: 30863703 DOI: 10.1007/s13205-019-1661-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2018] [Accepted: 02/27/2019] [Indexed: 12/13/2022] Open
Abstract
The present work describes the inhibition studies of free as well as immobilized urease by different heavy metals. Porous silicon (PS) films prepared by electrochemical etching were used for urease immobilization by physical adsorption. The enzyme was subjected to varying concentrations of Cr6+, Cr3+, Cu2+, Fe2+, Cd2+ and Ni2+ and analyzed for the variation in the activity. To study the effect of other heavy metals on the interaction of urease and Cr6+, free as well as immobilized urease was subjected to the combination of each metal ion with Cr6+. Results proved the sensitivity of free as well as immobilized urease towards heavy metals by observed reduction in activity. Immobilized urease showed less degree of inhibition compared to free urease when tested for inhibition by individual metal ions and in combination with Cr6+. IC50 values were found higher for inhibition by the combination of metal ions with Cr6+. Interaction of heavy metal ions with functional groups in active site of urease and limitations of mass transfer are the two factors responsible for the variation in activity of urease. Relation between the variation of urease activity and amount of heavy metals can be applied in biosensor development for determining the concentration of Cr6+ present in the water samples.
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Tong WY, Alnakhli M, Bhardwaj R, Apostolou S, Sinha S, Fraser C, Kuchel T, Kuss B, Voelcker NH. Delivery of siRNA in vitro and in vivo using PEI-capped porous silicon nanoparticles to silence MRP1 and inhibit proliferation in glioblastoma. J Nanobiotechnology 2018; 16:38. [PMID: 29653579 PMCID: PMC5898074 DOI: 10.1186/s12951-018-0365-y] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Accepted: 03/31/2018] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Multidrug resistance-associated protein 1 (MRP1) overexpression plays a major role in chemoresistance in glioblastoma multiforme (GBM) contributing to its notorious deadly nature. Although MRP1-siRNA transfection to GBM in vitro has been shown to sensitise the cells to drug, MRP1 silencing in vivo and the phenotypic influence on the tumour and normal tissues upon MRP1 down-regulation have not been established. Here, porous silicon nanoparticles (pSiNPs) that enable high-capacity loading and delivery of siRNA are applied in vitro and in vivo. RESULT We established pSiNPs with polyethyleneimine (PEI) capping that enables high-capacity loading of siRNA (92 µg of siRNA/mg PEI-pSiNPs), and optimised release profile (70% released between 24 and 48 h). These pSiNPs are biocompatible, and demonstrate cellular uptake and effective knockdown of MRP1 expression in GBM by 30%. Also, siRNA delivery was found to significantly reduce GBM proliferation as an associated effect. This effect is likely mediated by the attenuation of MRP1 transmembrane transport, followed by cell cycle arrest. MRP1 silencing in GBM tumour using MRP1-siRNA loaded pSiNPs was demonstrated in mice (82% reduction at the protein level 48 h post-injection), and it also produced antiproliferative effect in GBM by reducing the population of proliferative cells. These results indicate that in vitro observations are translatable in vivo. No histopathological signs of acute damage were observed in other MRP1-expressing organs despite collateral downregulations. CONCLUSIONS This study proposes the potential of efficient MRP1-siRNA delivery by using PEI-capped pSiNPs in achieving a dual therapeutic role of directly attenuating the growth of GBM while sensitising residual tumour cells to the effects of chemotherapy post-resection.
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Affiliation(s)
- Wing Yin Tong
- Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville, VIC, 3052, Australia.,Future Industries Institute, University of South Australia, Mawson Lakes, Adelaide, SA, 5095, Australia.,Melbourne Centre for Nanofabrication, Victorian Node of the Australian National Fabrication Facility, Clayton, VIC, 3168, Australia
| | - Mohammed Alnakhli
- School of Medicine, Flinders University, Bedford Park, Adelaide, SA, 5042, Australia
| | - Richa Bhardwaj
- Future Industries Institute, University of South Australia, Mawson Lakes, Adelaide, SA, 5095, Australia
| | - Sinoula Apostolou
- School of Medicine, Flinders University, Bedford Park, Adelaide, SA, 5042, Australia
| | - Sougata Sinha
- Future Industries Institute, University of South Australia, Mawson Lakes, Adelaide, SA, 5095, Australia
| | - Cara Fraser
- South Australian Health and Medical Research Institute, North Terrace, Adelaide, SA, 5000, Australia
| | - Tim Kuchel
- South Australian Health and Medical Research Institute, North Terrace, Adelaide, SA, 5000, Australia
| | - Bryone Kuss
- School of Medicine, Flinders University, Bedford Park, Adelaide, SA, 5042, Australia.
| | - Nicolas H Voelcker
- Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville, VIC, 3052, Australia. .,Future Industries Institute, University of South Australia, Mawson Lakes, Adelaide, SA, 5095, Australia. .,Melbourne Centre for Nanofabrication, Victorian Node of the Australian National Fabrication Facility, Clayton, VIC, 3168, Australia.
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