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Gibot L, Montigny A, Baaziz H, Fourquaux I, Audebert M, Rols MP. Calcium Delivery by Electroporation Induces In Vitro Cell Death through Mitochondrial Dysfunction without DNA Damages. Cancers (Basel) 2020; 12:cancers12020425. [PMID: 32059457 PMCID: PMC7072520 DOI: 10.3390/cancers12020425] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Accepted: 02/06/2020] [Indexed: 12/19/2022] Open
Abstract
Adolescent cancer survivors present increased risks of developing secondary malignancies due to cancer therapy. Electrochemotherapy is a promising anti-cancer approach that potentiates the cytotoxic effect of drugs by application of external electric field pulses. Clinicians proposed to associate electroporation and calcium. The current study aims to unravel the toxic mechanisms of calcium electroporation, in particular if calcium presents a genotoxic profile and if its cytotoxicity comes from the ion itself or from osmotic stress. Human dermal fibroblasts and colorectal HCT-116 cell line were treated by electrochemotherapy using bleomycin, cisplatin, calcium, or magnesium. Genotoxicity, cytotoxicity, mitochondrial membrane potential, ATP content, and caspases activities were assessed in cells grown on monolayers and tumor growth was assayed in tumor spheroids. Results in monolayers show that unlike cisplatin and bleomycin, calcium electroporation induces cell death without genotoxicity induction. Its cytotoxicity correlates with a dramatic fall in mitochondrial membrane potential and ATP depletion. Opposite of magnesium, over seven days of calcium electroporation led to spheroid tumor growth regression. As non-genotoxic, calcium has a better safety profile than conventional anticancer drugs. Calcium is already authorized by different health authorities worldwide. Therefore, calcium electroporation should be a cancer treatment of choice due to the reduced potential of secondary malignancies.
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Affiliation(s)
- Laure Gibot
- Institut de Pharmacologie et de Biologie Structurale, Université de Toulouse, CNRS, UPS, 31077 Toulouse, France; (L.G.); (A.M.); (H.B.)
| | - Audrey Montigny
- Institut de Pharmacologie et de Biologie Structurale, Université de Toulouse, CNRS, UPS, 31077 Toulouse, France; (L.G.); (A.M.); (H.B.)
| | - Houda Baaziz
- Institut de Pharmacologie et de Biologie Structurale, Université de Toulouse, CNRS, UPS, 31077 Toulouse, France; (L.G.); (A.M.); (H.B.)
| | - Isabelle Fourquaux
- Centre de Microscopie Électronique Appliquée à la Biologie, CMEAB, 133 route de Narbonne, 31062 Toulouse CEDEX, France;
| | - Marc Audebert
- Toxalim, Université de Toulouse, INRAE-UMR1331, ENVT, INP-Purpan, UPS, 31027 Toulouse, France
- Correspondence: (M.A.); (M.-P.R.)
| | - Marie-Pierre Rols
- Institut de Pharmacologie et de Biologie Structurale, Université de Toulouse, CNRS, UPS, 31077 Toulouse, France; (L.G.); (A.M.); (H.B.)
- Correspondence: (M.A.); (M.-P.R.)
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Santelli J, Lechevallier S, Baaziz H, Vincent M, Martinez C, Mauricot R, Parini A, Verelst M, Cussac D. Multimodal gadolinium oxysulfide nanoparticles: a versatile contrast agent for mesenchymal stem cell labeling. Nanoscale 2018; 10:16775-16786. [PMID: 30156241 DOI: 10.1039/c8nr03263g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Despite a clear development of innovative therapies based on stem cell manipulation, the availability of new tools to better understand and follow stem cell behavior and improve their biomedical applications is not adequate. Indeed, an ideal tracking device must have good ability to label stem cells as well as complete neutrality relative to their biology. Furthermore, preclinical studies imply in vitro and in vivo approaches that often require several kinds of labeling and/or detection procedures. Consequently, the multimodality concept presented in this work may present a solution to this problem as it has the potential to combine complementary imaging techniques. Spherical europium-doped gadolinium oxysulfide (Gd2O2S:Eu3+) nanoparticles are presented as a candidate as they are detectable by (1) magnetic resonance (MRI), (2) X-ray and (3) photoluminescence imaging. Whole body in vivo distribution, elimination and toxicity evaluation revealed a high tolerance of nanoparticles with a long-lasting MRI signal and slow hepatobiliary and renal clearance. In vitro labeling of a wide variety of cells unveils the nanoparticle potential for efficient and universal cell tracking. Emphasis on mesenchymal stromal cells (MSCs) leads to the definition of optimal conditions for labeling and tracking in the context of cell therapy: concentrations below 50 μg mL-1 and diameters between 170 and 300 nm. Viability, proliferation, migration and differentiation towards mesodermal lineages are preserved under these conditions, and cell labeling appears to be persistent and without any leakage. Ex vivo detection of as few as five thousand Gd2O2S:Eu3+-labeled MSCs by MRI combined with in vitro examination with fluorescence microscopy highlights the feasibility of cell tracking in cell therapy using this new nanoplatform.
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Affiliation(s)
- Julien Santelli
- CEMES-CNRS, Université de Toulouse, CNRS 29, rue Jeanne Marvig, BP 94347, 31055 Toulouse Cedex 4, France.
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Orio J, Bellard E, Baaziz H, Pichon C, Mouritzen P, Rols MP, Teissié J, Golzio M, Chabot S. Sub-cellular temporal and spatial distribution of electrotransferred LNA/DNA oligomer. J RNAi Gene Silencing 2013; 9:479-85. [PMID: 23946765 PMCID: PMC3717327] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/27/2012] [Revised: 03/04/2013] [Accepted: 03/15/2013] [Indexed: 11/22/2022]
Abstract
Low biological activity and inefficient targeted delivery in vivo have hindered RNA interference (RNAi)-based therapy from realising its full clinical potential. To overcome these hurdles, progresses have been made to develop new technologies optimizing oligonucleotides chemistry on one hand and achieving its effective delivery on the other hand. In this report, we achieved, by using the electropulsation technique (EP), efficient cellular delivery of chemically-modified oligonucleotide: The locked nucleic acid (LNA)/DNA oligomer. We used single cell level confocal fluorescence microscopy to follow the spatial and temporal distribution of electrotransferred cyanine 5 (Cy5)-labeled LNA/DNA oligomer. We observed that EP allowed LNA/DNA oligomer cellular uptake providing the oligomer a rapid access to the cytoplasm of HeLa cells. Within a few minutes after electrotransfer, Cy5-LNA/DNA oligomers shuttle from cytoplasm to nucleus whereas in absence of pulses application, Cy5-LNA/DNA oligomers were not detected. We then observed a redistribution of the Cy5 fluorescence that accumulated over time into cytoplasmic organelles. To go further and to identify these compartments, we used the HeLa GFP-Rab7 cell line to visualise late endosomes, and lysosomal or mitochondrial specific markers. Our results showed that the EP technique allowed direct entry into the cytoplasm of the Cy5-LNA/DNA oligomer bypassing the endocytosic pathway. However, in absence of pulses application, Cy5-LNA/DNA oligomer were able to enter cells through the endocytosic pathway. We demonstrated that EP is an efficient technique for LNA-based oligonucleotides delivery offering strong advantages by avoiding the endolysosomal compartmentalization, giving a rapid and free access to the cytoplasm and the nucleus where they can find their targets.
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Affiliation(s)
- Julie Orio
- αCentre National de la Recherche Scientifique, Institut de Pharmacologie et de Biologie Structurale, BP64182, 205 route de Narbonne, F-31077 Toulouse, France,βUniversité de Toulouse, UPS, IPBS, F-31077 Toulouse, France
| | - Elisabeth Bellard
- αCentre National de la Recherche Scientifique, Institut de Pharmacologie et de Biologie Structurale, BP64182, 205 route de Narbonne, F-31077 Toulouse, France,βUniversité de Toulouse, UPS, IPBS, F-31077 Toulouse, France
| | - Houda Baaziz
- αCentre National de la Recherche Scientifique, Institut de Pharmacologie et de Biologie Structurale, BP64182, 205 route de Narbonne, F-31077 Toulouse, France,βUniversité de Toulouse, UPS, IPBS, F-31077 Toulouse, France
| | - Chantal Pichon
- γCentre de Biophysique Moléculaire, CNRS UPR4301, rue Charles Sadron F-45071 Orléans, Cedex 02, Inserm and Université d’Orléans, France
| | | | - Marie-Pierre Rols
- αCentre National de la Recherche Scientifique, Institut de Pharmacologie et de Biologie Structurale, BP64182, 205 route de Narbonne, F-31077 Toulouse, France,βUniversité de Toulouse, UPS, IPBS, F-31077 Toulouse, France
| | - Justin Teissié
- αCentre National de la Recherche Scientifique, Institut de Pharmacologie et de Biologie Structurale, BP64182, 205 route de Narbonne, F-31077 Toulouse, France,βUniversité de Toulouse, UPS, IPBS, F-31077 Toulouse, France
| | - Muriel Golzio
- αCentre National de la Recherche Scientifique, Institut de Pharmacologie et de Biologie Structurale, BP64182, 205 route de Narbonne, F-31077 Toulouse, France,βUniversité de Toulouse, UPS, IPBS, F-31077 Toulouse, France,*Correspondence to: Muriel Golzio, , or Sophie Chabot, , Tel: +33 561 175813/27, Fax: +33 561 175994
| | - Sophie Chabot
- αCentre National de la Recherche Scientifique, Institut de Pharmacologie et de Biologie Structurale, BP64182, 205 route de Narbonne, F-31077 Toulouse, France,βUniversité de Toulouse, UPS, IPBS, F-31077 Toulouse, France,*Correspondence to: Muriel Golzio, , or Sophie Chabot, , Tel: +33 561 175813/27, Fax: +33 561 175994
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Osseni SA, Lechevallier S, Verelst M, Dujardin C, Dexpert-Ghys J, Neumeyer D, Leclercq M, Baaziz H, Cussac D, Santran V, Mauricot R. New nanoplatform based on Gd2O2S:Eu3+ core: synthesis, characterization and use for in vitro bio-labelling. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm13542b] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Abstract
First-principles density functional calculations, using the all-electron full potential linearized augmented plane wave method, have been performed in order to investigate the structural and electronic properties for Laves phase AV(2) (A = Ta, Ti, Hf and Nb) compounds. The generalized gradient approximation and the Engel-Vosko-generalized gradient approximation were used. Our calculations show that these compounds are metallic with more bands cutting the Fermi energy (E(F)) as we move from Nb to Ta, Hf and Ti, consistent with the increase in the values of the density of states at the Fermi level N(E(F)). N(E(F)) is controlled by the overlapping of V-p/d, A-d and A-p states around the Fermi energy. The ground state properties of these compounds, such as equilibrium lattice constant, are calculated and compared with the available literature. There is a strong/weak hybridization between the states, V-s states are strongly hybridized with A-s states below and above E(F). Around the Fermi energy we notice that V-p shows strong hybridization with A-p states.
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Affiliation(s)
- Z Charifi
- Physics Department, Faculty of Science and Engineering, University of M'sila, 28000 M'sila, Algeria
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