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Charras Q, Rey P, Guillemain D, Dourguin F, Laganier H, Peschoux S, Molinié R, Ismaël M, Caffarri S, Rayon C, Jungas C. An efficient protocol for extracting thylakoid membranes and total leaf proteins from Posidonia oceanica and other polyphenol-rich plants. PLANT METHODS 2024; 20:38. [PMID: 38468328 DOI: 10.1186/s13007-024-01166-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Accepted: 02/28/2024] [Indexed: 03/13/2024]
Abstract
BACKGROUND The extraction of thylakoids is an essential step in studying the structure of photosynthetic complexes and several other aspects of the photosynthetic process in plants. Conventional protocols have been developed for selected land plants grown in controlled conditions. Plants accumulate defensive chemical compounds such as polyphenols to cope with environmental stresses. When the polyphenol levels are high, their oxidation and cross-linking properties prevent thylakoid extraction. RESULTS In this study, we developed a method to counteract the hindering effects of polyphenols by modifying the grinding buffer with the addition of both vitamin C (VitC) and polyethylene glycol (PEG4000). This protocol was first applied to the marine plant Posidonia oceanica and then extended to other plants synthesizing substantial amounts of polyphenols, such as Quercus pubescens (oak) and Vitis vinifera (grapevine). Native gel analysis showed that photosynthetic complexes (PSII, PSI, and LHCII) can be extracted from purified membranes and fractionated comparably to those extracted from the model plant Arabidopsis thaliana. Moreover, total protein extraction from frozen P. oceanica leaves was also efficiently carried out using a denaturing buffer containing PEG and VitC. CONCLUSIONS Our work shows that the use of PEG and VitC significantly improves the isolation of native thylakoids, native photosynthetic complexes, and total proteins from plants containing high amounts of polyphenols and thus enables studies on photosynthesis in various plant species grown in natural conditions.
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Affiliation(s)
- Quentin Charras
- CEA, CNRS, BIAM, LGBP Team, Aix-Marseille University, Marseille, France
- Science for Life Laboratory, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH-Royal Institute of Technology, KTH University, Stockholm, Sweden
| | - Pascal Rey
- CEA, CNRS, BIAM, P&E Team, Aix-Marseille University, Saint Paul-Lez-Durance, France
| | - Dorian Guillemain
- CNRS, IRD, IRSTEA, OSU Institut Pythéas, Aix-Marseille University, Marseille, France
| | - Fabian Dourguin
- CEA, CNRS, BIAM, LGBP Team, Aix-Marseille University, Marseille, France
| | - Hugo Laganier
- CEA, CNRS, BIAM, LGBP Team, Aix-Marseille University, Marseille, France
| | - Sacha Peschoux
- UFR Informatique, mathématiques et mathématiques appliquées (IM2AG), Université Grenoble Alpes, Saint Martin d'Heres, France
| | - Roland Molinié
- UMR INRAE 1158 Transfrontalière BioEcoAgro, BIOlogie des Plantes et Innovation (BIOPI), UPJV, Amiens, France
| | - Marwa Ismaël
- UMR INRAE 1158 Transfrontalière BioEcoAgro, BIOlogie des Plantes et Innovation (BIOPI), UPJV, Amiens, France
| | - Stefano Caffarri
- CEA, CNRS, BIAM, LGBP Team, Aix-Marseille University, Marseille, France
| | - Catherine Rayon
- UMR INRAE 1158 Transfrontalière BioEcoAgro, BIOlogie des Plantes et Innovation (BIOPI), UPJV, Amiens, France
| | - Colette Jungas
- CEA, CNRS, BIAM, LGBP Team, Aix-Marseille University, Marseille, France.
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Aptamer Tethered Bio-Responsive Mesoporous Silica Nanoparticles for Efficient Targeted Delivery of Paclitaxel to Treat Ovarian Cancer Cells. J Pharm Sci 2023; 112:1450-1459. [PMID: 36669561 DOI: 10.1016/j.xphs.2023.01.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 01/11/2023] [Accepted: 01/11/2023] [Indexed: 01/19/2023]
Abstract
Ovarian cancer is the leading cause of cancer deaths in female patients. The current therapeutics in ovarian cancer are limited and inefficient in curing the disease. To tackle this, we have synthesized tetrasulfide derivative of silica doped, biodegradable, glutathione-responsive targeted mesoporous silica nanoparticles modified with heterobifunctional polyethylene glycol as a linker and mucin-1 aptamer for triggered paclitaxel delivery to the ovarian cancer cells. Degradable mesoporous silica nanoparticles were synthesized by a modified sol-gel method with tetraethyl orthosilicate and Bis (triethoxysilylpropyl) tetrasulfide. The degradable mesoporous silica nanoparticles were characterized by dynamic light scattering, Fourier-transform infrared spectroscopy, Scanning electron microscopy and Transmission electron microscopy. The degradable mesoporous silica nanoparticles had good paclitaxel encapsulation efficiency and glutathione-responsive paclitaxel release ability. The glutathione utilization assay and visual destruction observed within 10 days in transmission electron microscopy images confirmed the degradation of the mesoporous silica nanoparticles in the tumor cell environment. The targeted degradable mesoporous silica nanoparticles were efficiently taken up by ovarian cancer cell lines OVACAR-3 and PA-1. The cytotoxicity of bare mesoporous silica nanoparticles evaluated on NIH-3T3 cell line showed good biocompatibility (>90% cell viability). Significant toxicity on OVACAR-3 (IC50 25.66 nM) and PA-1 (IC50 42.93 nM) cell lines was observed when treated with paclitaxel-loaded targeted degradable mesoporous silica nanoparticles. Results of this study demonstrated that mucin-1 targeted, glutathione-responsive mesoporous silica nanoparticles loaded with paclitaxel had a significant antitumor effect on ovarian cancer cells. All these findings demonstrated that developed nano-formulation could be suitable for ovarian cancer treatment.
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Naz F, Samad Khan A, Kader MA, Al Gelban LOS, Mousa NMA, Asiri RSH, Hakeem AS. Comparative evaluation of mechanical and physical properties of a new bulk-fill alkasite with conventional restorative materials. Saudi Dent J 2021; 33:666-673. [PMID: 34803317 PMCID: PMC8589597 DOI: 10.1016/j.sdentj.2020.04.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2019] [Revised: 04/26/2020] [Accepted: 04/28/2020] [Indexed: 11/28/2022] Open
Abstract
PURPOSE The physical and mechanical performance of a newly commercialized dental restorative material (alkasite) was compared with glass ionomer cement (GIC) and nano-hybrid composite. METHODOLOGY Human extracted premolars were used to investigate the shear bond strength. Restorative materials were placed on the dentine surface and were aged in deionized water for 14 days. The 3-D surface roughness was evaluated before and after chewing simulation cycles (50,000). The samples were fatigued mechanically using a chewing simulator and investigated with a scanning electron microscope (SEM). RESULTS For shear bond strength, alkasite showed significantly high values than GIC, whereas non-significant difference was observed between alkasite and nano-hybrid composite. After the chewing simulation (50,000 cycles), non-significant difference was found between GIC and nano-hybrid composite, where surface roughness values were highest for GIC and lowest for alkasite. CONCLUSION The newly developed restorative material (alkasite) has shown better results than existing restorative materials.
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Affiliation(s)
- Fariha Naz
- Department of Restorative Dental Sciences, College of Dentistry, King Khalid University, Abha 62521, Saudi Arabia
| | - Abdul Samad Khan
- Department of Restorative Dental Sciences, College of Dentistry, Imam Abdulrahman Bin Faisal University, Dammam 31441, Saudi Arabia
| | - Mohammed Abdul Kader
- Department of Restorative Dental Sciences, College of Dentistry, King Khalid University, Abha 62521, Saudi Arabia
| | | | | | | | - Abbas Saeed Hakeem
- Center of Excellence in Nanotechnology, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia
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Banche-Niclot F, Montalbano G, Fiorilli S, Vitale-Brovarone C. PEG-Coated Large Mesoporous Silicas as Smart Platform for Protein Delivery and Their Use in a Collagen-Based Formulation for 3D Printing. Int J Mol Sci 2021; 22:1718. [PMID: 33572076 PMCID: PMC7914545 DOI: 10.3390/ijms22041718] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 02/04/2021] [Accepted: 02/05/2021] [Indexed: 01/16/2023] Open
Abstract
Silica-based mesoporous systems have gained great interest in drug delivery applications due to their excellent biocompatibility and high loading capability. However, these materials face challenges in terms of pore-size limitations since they are characterized by nanopores ranging between 6-8 nm and thus unsuitable to host large molecular weight molecules such as proteins, enzymes and growth factors (GFs). In this work, for an application in the field of bone regeneration, large-pore mesoporous silicas (LPMSs) were developed to vehicle large biomolecules and release them under a pH stimulus. Considering bone remodeling, the proposed pH-triggered mechanism aims to mimic the release of GFs encased in the bone matrix due to bone resorption by osteoclasts (OCs) and the associated pH drop. To this aim, LPMSs were prepared by using 1,3,5-trimethyl benzene (TMB) as a swelling agent and the synthesis solution was hydrothermally treated and the influence of different process temperatures and durations on the resulting mesostructure was investigated. The synthesized particles exhibited a cage-like mesoporous structure with accessible pores of diameter up to 23 nm. LPMSs produced at 140 °C for 24 h showed the best compromise in terms of specific surface area, pores size and shape and hence, were selected for further experiments. Horseradish peroxidase (HRP) was used as model protein to evaluate the ability of the LPMSs to adsorb and release large biomolecules. After HRP-loading, LPMSs were coated with a pH-responsive polymer, poly(ethylene glycol) (PEG), allowing the release of the incorporated biomolecules in response to a pH decrease, in an attempt to mimic GFs release in bone under the acidic pH generated by the resorption activity of OCs. The reported results proved that PEG-coated carriers released HRP more quickly in an acidic environment, due to the protonation of PEG at low pH that catalyzes polymer hydrolysis reaction. Our findings indicate that LPMSs could be used as carriers to deliver large biomolecules and prove the effectiveness of PEG as pH-responsive coating. Finally, as proof of concept, a collagen-based suspension was obtained by incorporating PEG-coated LPMS carriers into a type I collagen matrix with the aim of designing a hybrid formulation for 3D-printing of bone scaffolds.
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Affiliation(s)
- Federica Banche-Niclot
- Department of Applied Science and Technology, Politecnico di Torino, 10029 Torino, Italy; (F.B.-N.); (G.M.); (S.F.)
- Department of Surgical Science, Università degli Studi di Torino, 10029 Torino, Italy
| | - Giorgia Montalbano
- Department of Applied Science and Technology, Politecnico di Torino, 10029 Torino, Italy; (F.B.-N.); (G.M.); (S.F.)
| | - Sonia Fiorilli
- Department of Applied Science and Technology, Politecnico di Torino, 10029 Torino, Italy; (F.B.-N.); (G.M.); (S.F.)
- National Interuniversity Consortium of Materials Science and Technology (RU Politecnico di Torino), 50121 Firenze, Italy
| | - Chiara Vitale-Brovarone
- Department of Applied Science and Technology, Politecnico di Torino, 10029 Torino, Italy; (F.B.-N.); (G.M.); (S.F.)
- National Interuniversity Consortium of Materials Science and Technology (RU Politecnico di Torino), 50121 Firenze, Italy
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