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Varache M, Ciancone M, Couffin AC. Optimization of a Solid-Phase Extraction Procedure for the Analysis of Drug-Loaded Lipid Nanoparticles and its Application to the Determination of Leakage and Release Profiles. J Pharm Sci 2020; 109:2527-2535. [PMID: 32428534 DOI: 10.1016/j.xphs.2020.05.003] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Revised: 04/01/2020] [Accepted: 05/06/2020] [Indexed: 11/26/2022]
Abstract
To understand and predict the efficacy and toxicity of nanoparticle-based drugs in vivo, the free and entrapped forms of the drug have to be determined using suitable characterization methods. Herein, a solid-phase extraction (SPE) method combined with high-performance liquid chromatography (HPLC) measurements were used to separately quantify free and entrapped cyclosporine A (CsA) in 50 and 120 nm-sized lipid nanoparticles (NPs). Combined with colloidal stability measurements, HPLC quantification of the free and entrapped drug, separated using SPE, was used to monitor the stability of the nanotherapeutics under storage or physiological conditions. The SPE method was proven not to alter the core-shell template of the lipid nanocarriers. Method validation demonstrated suitable linearity, repeatability, accuracy, and specificity to quantify the free, entrapped, and total drug. Under storage conditions, the %free and %entrapped CsA remained constant over 9 weeks for both NPs. Under physiological conditions, the release profile was similar for both buffers/mediums used, indicating a biphasic mode of release. The validated SPE method was proven to be suitable for the determination of a wide range of free versus entrapped compounds.
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Affiliation(s)
- Mathieu Varache
- CEA-LETI, Microtechnologies for Healthcare and Biology Division, Grenoble, France; Université Grenoble Alpes, Grenoble, France.
| | - Mathieu Ciancone
- CEA-LETI, Microtechnologies for Healthcare and Biology Division, Grenoble, France; Université Grenoble Alpes, Grenoble, France
| | - Anne-Claude Couffin
- CEA-LETI, Microtechnologies for Healthcare and Biology Division, Grenoble, France; Université Grenoble Alpes, Grenoble, France
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Vigne J, Cabella C, Dézsi L, Rustique E, Couffin AC, Aid R, Anizan N, Chauvierre C, Letourneur D, Le Guludec D, Rouzet F, Hyafil F, Mészáros T, Fülöp T, Szebeni J, Cordaro A, Oliva P, Mourier V, Texier I. Nanostructured lipid carriers accumulate in atherosclerotic plaques of ApoE -/- mice. Nanomedicine 2020; 25:102157. [PMID: 31982616 DOI: 10.1016/j.nano.2020.102157] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 12/04/2019] [Accepted: 01/18/2020] [Indexed: 12/20/2022]
Abstract
Nanostructured lipid carriers (NLC) might represent an interesting approach for the identification and targeting of rupture-prone atherosclerotic plaques. In this study, we evaluated the biodistribution, targeting ability and safety of 64Cu-fonctionalized NLC in atherosclerotic mice. 64Cu-chelating-NLC (51.8±3.1 nm diameter) with low dispersity index (0.066±0.016) were produced by high pressure homogenization at tens-of-grams scale. 24 h after injection of 64Cu-chelated particles in ApoE-/- mice, focal regions of the aorta showed accumulation of particles on autoradiography that colocalized with Oil Red O lipid mapping. Signal intensity was significantly greater in aortas isolated from ApoE-/- mice compared to wild type (WT) control (8.95 [7.58, 10.16]×108 vs 4.59 [3.11, 5.03]×108 QL/mm2, P < 0.05). Moreover, NLC seemed safe in relevant biocompatibility studies. NLC could constitute an interesting platform with high clinical translation potential for targeted delivery and imaging purposes in atherosclerosis.
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Affiliation(s)
- Jonathan Vigne
- Université de Paris, LVTS, INSERM U1148, Paris, France; Nuclear Medicine Department, X. Bichat Hospital, APHP and DHU FIRE, Paris, France; Université de Paris, UMS34 FRIM, Paris, France
| | - Claudia Cabella
- Centro Ricerche Bracco, Bracco Imaging SpA, Colleretto Giacosa, Italy
| | - László Dézsi
- Nanomedicine Research and Education Center, Institute of Pathophysiology, Semmelweis University, Budapest, Hungary
| | | | | | - Rachida Aid
- Université de Paris, UMS34 FRIM, Paris, France
| | | | | | | | - Dominique Le Guludec
- Université de Paris, LVTS, INSERM U1148, Paris, France; Nuclear Medicine Department, X. Bichat Hospital, APHP and DHU FIRE, Paris, France; Université de Paris, UMS34 FRIM, Paris, France
| | - François Rouzet
- Université de Paris, LVTS, INSERM U1148, Paris, France; Nuclear Medicine Department, X. Bichat Hospital, APHP and DHU FIRE, Paris, France; Université de Paris, UMS34 FRIM, Paris, France
| | - Fabien Hyafil
- Université de Paris, LVTS, INSERM U1148, Paris, France; Nuclear Medicine Department, X. Bichat Hospital, APHP and DHU FIRE, Paris, France; Université de Paris, UMS34 FRIM, Paris, France
| | - Tamás Mészáros
- Nanomedicine Research and Education Center, Institute of Pathophysiology, Semmelweis University, Budapest, Hungary
| | - Tamás Fülöp
- Nanomedicine Research and Education Center, Institute of Pathophysiology, Semmelweis University, Budapest, Hungary
| | - János Szebeni
- Nanomedicine Research and Education Center, Institute of Pathophysiology, Semmelweis University, Budapest, Hungary
| | - Alessia Cordaro
- Centro Ricerche Bracco, Bracco Imaging SpA, Colleretto Giacosa, Italy
| | - Paolo Oliva
- Centro Ricerche Bracco, Bracco Imaging SpA, Colleretto Giacosa, Italy
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Gauthier L, Varache M, Couffin AC, Lebrun C, Delangle P, Gateau C, Texier I. Quantification of Surface GalNAc Ligands Decorating Nanostructured Lipid Carriers by UPLC-ELSD. Int J Mol Sci 2019; 20:ijms20225669. [PMID: 31726778 PMCID: PMC6888163 DOI: 10.3390/ijms20225669] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Revised: 11/07/2019] [Accepted: 11/09/2019] [Indexed: 12/16/2022] Open
Abstract
Nanoparticles have been extensively studied for drug delivery and targeting to specific organs. The functionalization of the nanoparticle surface by site-specific ligands (antibodies, peptides, saccharides) can ensure efficient recognition and binding with relevant biological targets. One of the main challenges in the development of these decorated nanocarriers is the accurate quantification of the amount of ligands on the nanoparticle surface. In this study, nanostructured lipid carriers (NLC) were functionalized with N-acetyl-D-galactosamine (GalNAc) units, known to target the asialoglycoprotein receptor (ASGPR). Different molar percentages of GalNAc-functionalized surfactant (0%, 2%, 5%, and 14%) were used in the formulation. Based on ultra-high-performance liquid chromatography separation and evaporative light-scattering detection (UPLC-ELSD), an analytical method was developed to specifically quantify the amount of GalNAc units present at the NLC surface. This method allowed the accurate quantification of GalNAc surfactant and therefore gave some insights into the structural parameters of these multivalent ligand systems. Our data show that the GalNAc decorated NLC possess large numbers of ligands at their surface and suitable distances between them for efficient multivalent interaction with the ASGPR, and therefore promising liver-targeting efficiency.
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Affiliation(s)
- Laura Gauthier
- Université Grenoble Alpes, CEA, LETI-DTBS, F-38000 Grenoble, France; (L.G.); (M.V.); (A.-C.C.)
- Université Grenoble Alpes, CEA, CNRS, IRIG-SyMMES, F-38000 Grenoble, France; (C.L.); (P.D.)
| | - Mathieu Varache
- Université Grenoble Alpes, CEA, LETI-DTBS, F-38000 Grenoble, France; (L.G.); (M.V.); (A.-C.C.)
| | - Anne-Claude Couffin
- Université Grenoble Alpes, CEA, LETI-DTBS, F-38000 Grenoble, France; (L.G.); (M.V.); (A.-C.C.)
| | - Colette Lebrun
- Université Grenoble Alpes, CEA, CNRS, IRIG-SyMMES, F-38000 Grenoble, France; (C.L.); (P.D.)
| | - Pascale Delangle
- Université Grenoble Alpes, CEA, CNRS, IRIG-SyMMES, F-38000 Grenoble, France; (C.L.); (P.D.)
| | - Christelle Gateau
- Université Grenoble Alpes, CEA, CNRS, IRIG-SyMMES, F-38000 Grenoble, France; (C.L.); (P.D.)
- Correspondence: (C.G.); (I.T.); Tel.: +33-438-786-041 (C.G.); +33-438-784-670 (I.T.)
| | - Isabelle Texier
- Université Grenoble Alpes, CEA, LETI-DTBS, F-38000 Grenoble, France; (L.G.); (M.V.); (A.-C.C.)
- Correspondence: (C.G.); (I.T.); Tel.: +33-438-786-041 (C.G.); +33-438-784-670 (I.T.)
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Caputo F, Arnould A, Bacia M, Ling WL, Rustique E, Texier I, Mello AP, Couffin AC. Measuring Particle Size Distribution by Asymmetric Flow Field Flow Fractionation: A Powerful Method for the Preclinical Characterization of Lipid-Based Nanoparticles. Mol Pharm 2019; 16:756-767. [PMID: 30604620 PMCID: PMC6377179 DOI: 10.1021/acs.molpharmaceut.8b01033] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [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] [Indexed: 01/03/2023]
Abstract
Particle size distribution and stability are key attributes for the evaluation of the safety and efficacy profile of medical nanoparticles (Med-NPs). Measuring particle average size and particle size distribution is a challenging task which requires the combination of orthogonal high-resolution sizing techniques, especially in complex biological media. Unfortunately, despite its limitations, due to its accessibility, low cost, and easy handling, batch mode dynamic light scattering (DLS) is still very often used as the only approach to measure particle size distribution in the nanomedicine field. In this work the use of asymmetric flow field flow fractionation coupled to multiangle light scattering and dynamic light scattering detectors (AF4-MALS-DLS) was evaluated as an alternative to batch mode DLS to measure the physical properties of lipid-based nanoparticles. A robust standard operating procedure (SOPs) developed by the Nanomedicine Characterization Laboratory (EUNCL) was presented and tested to assess size stability, batch to batch consistency, and the behavior of the lipid-based nanoparticles in plasma. Orthogonal sizing techniques, such as transmission electron microscopy (TEM) and particle tracking analysis (PTA) measurements, were performed to support the results. While batch mode DLS could be applied as a fast and simple method to provide a preliminary insight into the integrity and polydispersity of samples, it was unsuitable to resolve small modifications of the particle size distribution. The introduction of nanoparticle sorting by field-flow fractionation coupled to online DLS and MALS allowed assessment of batch to batch variability and changes in the size of the lipid nanoparticles induced by the interaction with serum proteins, which are critical for quality control and regulatory aspects. In conclusion, if a robust SOP is followed, AF4-MALS-DLS is a powerful method for the preclinical characterization of lipid-based nanoparticles.
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Affiliation(s)
- Fanny Caputo
- Univ. Grenoble Alpes, CEA , LETI , F-38000 Grenoble , France
| | | | - Maria Bacia
- Univ. Grenoble Alpes, CEA , CNRS, IBS , F-38000 Grenoble , France
| | - Wai Li Ling
- Univ. Grenoble Alpes, CEA , CNRS, IBS , F-38000 Grenoble , France
| | - Emilie Rustique
- Univ. Grenoble Alpes, CEA , LETI , F-38000 Grenoble , France
| | - Isabelle Texier
- Univ. Grenoble Alpes, CEA , LETI , F-38000 Grenoble , France
| | - Adriele Prina Mello
- Laboratory for Biological Characterisation of Advanced Materials (LBCAM), Department of Clinical Medicine , Trinity Translational Medicine Institute (TTMI), School of Medicine, Trinity College Dublin , Dublin 8 , Ireland.,AMBER Centre and CRANN Institute, Trinity College Dublin , Dublin 2 , Ireland
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Séon-Lutz M, Couffin AC, Vignoud S, Schlatter G, Hébraud A. Electrospinning in water and in situ crosslinking of hyaluronic acid / cyclodextrin nanofibers: Towards wound dressing with controlled drug release. Carbohydr Polym 2018; 207:276-287. [PMID: 30600010 DOI: 10.1016/j.carbpol.2018.11.085] [Citation(s) in RCA: 95] [Impact Index Per Article: 15.8] [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: 07/17/2018] [Revised: 10/30/2018] [Accepted: 11/26/2018] [Indexed: 12/19/2022]
Abstract
Hyaluronic acid (HA) is widely investigated due to its high potential for wound dressing applications. The fabrication of biomimetic HA-based scaffolds by electrospinning is thus extensively studied. However, HA is often dissolved in toxic organic solvents to allow the efficient production of electrospun nanofibers. Indeed, although HA is soluble in water, its ionic nature leading to long-range electrostatic interactions and the presence of counter ions induce a dramatic increase of the viscosity of aqueous HA solutions without insuring enough chain entanglements necessary for a stable and efficient electrospinning. In this study, biocompatible insoluble HA-based nanofibers were fabricated by electrospinning in pure water. To this end, poly(vinyl alcohol) (PVA) was added as a carrier polymer and it was found that the addition of hydroxypropyl-βcyclodextrin (HPβCD) stabilized the process of electrospinning and led to the efficient formation of uniform nanofibrous scaffolds. An in situ crosslinking process of the scaffolds is also proposed, insuring a whole fabrication process without any toxicity. Furthermore, the beneficial presence of HPβCD in the HA-based scaffolds paves the way for wound dressing applications with controlled drug encapsulation-release properties. As a proof of concept, naproxen (NAP), a non-steroidal anti-inflammatory drug was chosen as a model drug. NAP was impregnated into the scaffolds either in aqueous solution or under supercritical CO2. The resulting functional scaffolds showed a regular drug release profile along several days without losing the fibrous structure. This study proposes a simple approach to form stable HA-based nanofibrous scaffolds embedding HPβCD using water as the only solvent, enabling the development of safe functional wound dressings.
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Affiliation(s)
- Morgane Séon-Lutz
- CEA-LETI, Microtechnologies for Biology and Healthcare Division, 17 rue des Martyrs, 38054 Grenoble Cedex 09, France; ICPEES, Institut de Chimie et Procédé pour l'Energie l'Environnement et la Santé, CNRS UMR 7515, ECPM-Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg Cedex 2, France
| | - Anne-Claude Couffin
- CEA-LETI, Microtechnologies for Biology and Healthcare Division, 17 rue des Martyrs, 38054 Grenoble Cedex 09, France; Université Grenoble Alpes, 38000 Grenoble, France
| | - Séverine Vignoud
- CEA-LETI, Microtechnologies for Biology and Healthcare Division, 17 rue des Martyrs, 38054 Grenoble Cedex 09, France; Université Grenoble Alpes, 38000 Grenoble, France
| | - Guy Schlatter
- ICPEES, Institut de Chimie et Procédé pour l'Energie l'Environnement et la Santé, CNRS UMR 7515, ECPM-Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg Cedex 2, France
| | - Anne Hébraud
- ICPEES, Institut de Chimie et Procédé pour l'Energie l'Environnement et la Santé, CNRS UMR 7515, ECPM-Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg Cedex 2, France.
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Varache M, Escudé M, Laffont C, Rustique E, Couffin AC. Development and validation of an HPLC-fluorescence method for the quantification of IR780-oleyl dye in lipid nanoparticles. Int J Pharm 2017; 532:779-789. [PMID: 28619458 DOI: 10.1016/j.ijpharm.2017.06.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [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: 04/06/2017] [Revised: 06/06/2017] [Accepted: 06/07/2017] [Indexed: 11/24/2022]
Abstract
A reversed-phase (RP) high-performance liquid chromatography (HPLC) method for the content determination of IR780-oleyl (IRO) dye in lipid nanoparticles was developed and validated. Chromatographic separation was performed on a RP C18 column with a gradient program of water and acetonitrile both with 0.1% (v/v) TFA, at a flow rate of 1.0mL/min and a total run of 21min. IRO dye detection was made by fluorescence at emission wavelength of 773nm (excitation wavelength: 744nm). According to ICH guidelines, the developed method was shown to be specific, linear in the range 3-8μg/mL (R2=0.9998), precise at the intra-day and inter-day levels as reflected by the coefficient of variation (CV≤1.98%) at three different concentrations (4, 6 and 8 μg/mL) and accurate, with recovery rates between 98.2-101.6% and 99.2-100.5%. The detection and quantitation limits were 0.41 and 1.24μg/mL, respectively. Stability studies of sample processing showed that IRO dye was stable after 24h in the autosampler or after three freeze/thaw cycles. Combined with fluorescence measurements, the developed method was successfully applied to optimize the loading capacity of IRO dye in the core of lipid nanoparticles.
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Affiliation(s)
- Mathieu Varache
- CEA-LETI, Microtechnologies for Biology and Healthcare Division, 17 rue des Martyrs, 38054 Grenoble Cedex 09, France; Université Grenoble Alpes, 38000 Grenoble, France
| | - Marie Escudé
- CEA-LETI, Microtechnologies for Biology and Healthcare Division, 17 rue des Martyrs, 38054 Grenoble Cedex 09, France; Université Grenoble Alpes, 38000 Grenoble, France
| | - Corentin Laffont
- CEA-LETI, Microtechnologies for Biology and Healthcare Division, 17 rue des Martyrs, 38054 Grenoble Cedex 09, France; Université Grenoble Alpes, 38000 Grenoble, France
| | - Emilie Rustique
- CEA-LETI, Microtechnologies for Biology and Healthcare Division, 17 rue des Martyrs, 38054 Grenoble Cedex 09, France; Université Grenoble Alpes, 38000 Grenoble, France
| | - Anne-Claude Couffin
- CEA-LETI, Microtechnologies for Biology and Healthcare Division, 17 rue des Martyrs, 38054 Grenoble Cedex 09, France; Université Grenoble Alpes, 38000 Grenoble, France.
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Hinger D, Gräfe S, Navarro F, Spingler B, Pandiarajan D, Walt H, Couffin AC, Maake C. Lipid nanoemulsions and liposomes improve photodynamic treatment efficacy and tolerance in CAL-33 tumor bearing nude mice. J Nanobiotechnology 2016; 14:71. [PMID: 27716314 PMCID: PMC5048629 DOI: 10.1186/s12951-016-0223-8] [Citation(s) in RCA: 14] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Accepted: 09/27/2016] [Indexed: 11/15/2022] Open
Abstract
Background Photodynamic therapy (PDT) as promising alternative to conventional cancer treatments works by irradiation of a photosensitizer (PS) with light, which creates reactive oxygen species and singlet oxygen (1O2), that damage the tumor. However, a routine use is hindered by the PS’s poor water solubility and extended cutaneous photosensitivity of patients after treatment. In our study we sought to overcome these limitations by encapsulation of the PS m-tetrahydroxyphenylchlorin (mTHPC) into a biocompatible nanoemulsion (Lipidots). Results In CAL-33 tumor bearing nude mice we compared the Lipidots to the existing liposomal mTHPC nanoformulation Foslip and the approved mTHPC formulation Foscan. We established biodistribution profiles via fluorescence measurements in vivo and high performance liquid chromatography (HPLC) analysis. All formulations accumulated in the tumors and we could determine the optimum treatment time point for each substance (8 h for mTHPC, 24 h for Foslip and 72 h for the Lipidots). We used two different light doses (10 and 20 J/cm2) and evaluated immediate PDT effects 48 h after treatment and long term effects 14 days later. We also analyzed tumors by histological analysis and performing reverse transcription real-time PCR with RNA extracts. Concerning tumor destruction Foslip was superior to Lipidots and Foscan while with regard to tolerance and side effects Lipidots were giving the best results. Conclusions We could demonstrate in our study that nanoformulations are superior to the free PS mTHPC. The development of a potent nanoformulation is of major importance because the free PS is related to several issues such as poor bioavailability, solubility and increased photosensibility of patients. We could show in this study that Foslip is very potent in destroying the tumors itself. However, because the Lipidots' biocompatibility is outstanding and superior to the liposomes we plan to carry out further investigations and protocol optimization. Both nanoformulations show great potential to revolutionize PDT in the future. Electronic supplementary material The online version of this article (doi:10.1186/s12951-016-0223-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Doris Hinger
- Institute of Anatomy, University of Zurich, Winterthurerstrasse 190, Zurich, 8057, Switzerland.
| | - Susanna Gräfe
- Biolitec Research GmbH, Otto-Schott-Str. 15, 07745, Jena, Germany
| | - Fabrice Navarro
- CEA, LETI, MINATEC Campus, Commissariat à l'Énergie Atomique et aux Énergies Alternatives (CEA), Technologies for Biology and Healthcare Division, 38054, Grenoble, France.,Université Grenoble Alpes, Grenoble, 38000, France
| | - Bernhard Spingler
- Department of Inorganic Chemistry, University of Zurich, Winterthurerstrasse 190, Zurich, 8057, Switzerland
| | - Devaraj Pandiarajan
- Department of Inorganic Chemistry, University of Zurich, Winterthurerstrasse 190, Zurich, 8057, Switzerland
| | - Heinrich Walt
- Department of Cranio-Maxillofacial Surgery, University Hospital Zurich, Frauenklinikstrasse 24, Zurich, 8091, Switzerland
| | - Anne-Claude Couffin
- CEA, LETI, MINATEC Campus, Commissariat à l'Énergie Atomique et aux Énergies Alternatives (CEA), Technologies for Biology and Healthcare Division, 38054, Grenoble, France.,Université Grenoble Alpes, Grenoble, 38000, France
| | - Caroline Maake
- Institute of Anatomy, University of Zurich, Winterthurerstrasse 190, Zurich, 8057, Switzerland
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Hinger D, Navarro F, Käch A, Thomann JS, Mittler F, Couffin AC, Maake C. Photoinduced effects of m-tetrahydroxyphenylchlorin loaded lipid nanoemulsions on multicellular tumor spheroids. J Nanobiotechnology 2016; 14:68. [PMID: 27604187 PMCID: PMC5015221 DOI: 10.1186/s12951-016-0221-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [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: 06/16/2016] [Accepted: 08/29/2016] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Photosensitizers are used in photodynamic therapy (PDT) to destruct tumor cells, however, their limited solubility and specificity hampers routine use, which may be overcome by encapsulation. Several promising novel nanoparticulate drug carriers including liposomes, polymeric nanoparticles, metallic nanoparticles and lipid nanocomposites have been developed. However, many of them contain components that would not meet safety standards of regulatory bodies and due to difficulties of the manufacturing processes, reproducibility and scale up procedures these drugs may eventually not reach the clinics. Recently, we have designed a novel lipid nanostructured carrier, namely Lipidots, consisting of nontoxic and FDA approved ingredients as promising vehicle for the approved photosensitizer m-tetrahydroxyphenylchlorin (mTHPC). RESULTS In this study we tested Lipidots of two different sizes (50 and 120 nm) and assessed their photodynamic potential in 3-dimensional multicellular cancer spheroids. Microscopically, the intracellular accumulation kinetics of mTHPC were retarded after encapsulation. However, after activation mTHPC entrapped into 50 nm particles destroyed cancer spheroids as efficiently as the free drug. Cell death and gene expression studies provide evidence that encapsulation may lead to different cell killing modes in PDT. CONCLUSIONS Since ATP viability assays showed that the carriers were nontoxic and that encapsulation reduced dark toxicity of mTHPC we conclude that our 50 nm photosensitizer carriers may be beneficial for clinical PDT applications.
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Affiliation(s)
- Doris Hinger
- Institute of Anatomy, University of Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland.
| | - Fabrice Navarro
- Technologies for Biology and Healthcare Division, CEA, LETI, MINATEC Campus, Commissariat à l'Énergie Atomique et aux Énergies Alternatives (CEA), 38054, Grenoble, France.,Université Grenoble Alpes, 38000, Grenoble, France
| | - Andres Käch
- Center for Microscopy and Image Analysis, University of Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland
| | - Jean-Sébastien Thomann
- Technologies for Biology and Healthcare Division, CEA, LETI, MINATEC Campus, Commissariat à l'Énergie Atomique et aux Énergies Alternatives (CEA), 38054, Grenoble, France.,Université Grenoble Alpes, 38000, Grenoble, France
| | - Frédérique Mittler
- Technologies for Biology and Healthcare Division, CEA, LETI, MINATEC Campus, Commissariat à l'Énergie Atomique et aux Énergies Alternatives (CEA), 38054, Grenoble, France.,Université Grenoble Alpes, 38000, Grenoble, France
| | - Anne-Claude Couffin
- Technologies for Biology and Healthcare Division, CEA, LETI, MINATEC Campus, Commissariat à l'Énergie Atomique et aux Énergies Alternatives (CEA), 38054, Grenoble, France.,Université Grenoble Alpes, 38000, Grenoble, France
| | - Caroline Maake
- Institute of Anatomy, University of Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland
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Delmas T, Fraichard A, Bayle PA, Texier I, Bardet M, Baudry J, Bibette J, Couffin AC. Encapsulation and Release Behavior from Lipid Nanoparticles: Model Study with Nile Red Fluorophore. ACTA ACUST UNITED AC 2012. [DOI: 10.1166/jcsb.2012.1010] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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10
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Gravier J, Navarro FP, Delmas T, Mittler F, Couffin AC, Vinet F, Texier I. Lipidots: competitive organic alternative to quantum dots for in vivo fluorescence imaging. J Biomed Opt 2011; 16:096013. [PMID: 21950927 DOI: 10.1117/1.3625405] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The use of fluorescent nanostructures can bring several benefits on the signal to background ratio for in vitro microscopy, in vivo small animal imaging, and image-guided surgery. Fluorescent quantum dots (QDs) display outstanding optical properties, with high brightness and low photobleaching rate. However, because of their toxic element core composition and their potential long term retention in reticulo-endothelial organs such as liver, their in vivo human applications seem compromised. The development of new dye-loaded (DiO, DiI, DiD, DiR, and Indocyanine Green (ICG)) lipid nanoparticles for fluorescence imaging (lipidots) is described here. Lipidot optical properties quantitatively compete with those of commercial QDs (QTracker(®)705). Multichannel in vivo imaging of lymph nodes in mice is demonstrated for doses as low as 2 pmols of particles. Along with their optical properties, fluorescent lipidots display very low cytotoxicity (IC(50) > 75 nM), which make them suitable tools for in vitro, and especially in vivo, fluorescence imaging applications.
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Affiliation(s)
- Julien Gravier
- CEA Grenoble, LETI-DTBS, MINATEC Campus, Grenoble, 38054 France
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Delmas T, Couffin AC, Bayle PA, Crécy FD, Neumann E, Vinet F, Bardet M, Bibette J, Texier I. Preparation and characterization of highly stable lipid nanoparticles with amorphous core of tuneable viscosity. J Colloid Interface Sci 2011; 360:471-81. [DOI: 10.1016/j.jcis.2011.04.080] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2011] [Revised: 04/15/2011] [Accepted: 04/19/2011] [Indexed: 11/26/2022]
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Delmas T, Piraux H, Couffin AC, Texier I, Vinet F, Poulin P, Cates ME, Bibette J. How to prepare and stabilize very small nanoemulsions. Langmuir 2011; 27:1683-92. [PMID: 21226496 DOI: 10.1021/la104221q] [Citation(s) in RCA: 201] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Practical and theoretical considerations that apply when aiming to formulate by ultrasonication very small nanoemulsions (particle diameter up to 150 nm) with very high stability are presented and discussed. The droplet size evolution during sonication can be described by a monoexponential function of the sonication time, the characteristic time scale depending essentially on the applied power. A unique master curve is obtained when plotting the mean diameter size evolution as a function of sonication energy. We then show that Ostwald ripening remains the main destabilization mechanism whereas coalescence can be easily prevented due to the nanometric size of droplets. The incorporation of "trapped species" within the droplet interior is able to counteract Ostwald ripening, and this concept can be extended to the membrane compartment. We finally clarify that nanoemulsions are not thermodynamically stable systems, even in the case where their composition lies very close to the demixing line of a thermodynamically stable microemulsion domain. However, as exemplified in the present work, nanoemulsion systems can present very long-term kinetic stability.
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Affiliation(s)
- Thomas Delmas
- CEA-LETI, Campus MINATEC, Département des Technologies pour la Biologie et la Santé, 17 rue des Martyrs, F-38054 Grenoble, France
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Juliette M, Navarro F, Delmas T, Heinrich É, Vinet F, Couffin AC, Tavitian B, Texier I. 15: Development and use of vectorized lipid nanoparticles (LNP) for PET and fluorescence imaging in oncology. Bull Cancer 2010. [DOI: 10.1016/s0007-4551(15)31108-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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