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Lipid-Based Nanovesicles for Simultaneous Intracellular Delivery of Hydrophobic, Hydrophilic, and Amphiphilic Species

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Lipid-Based Nanovesicles for Simultaneous Intracellular Delivery of Hydrophobic, Hydrophilic, and Amphiphilic Species ORIGINAL RESEARCH published: 03 July 2020 doi: 10.3389/fbioe.2020.00690 Lipid-Based Nanovesicles for Simultaneous Intracellular Delivery of Hydrophobic, Hydrophilic, and Amphiphilic Species Antonella Zacheo 1, Luca Bizzarro 2, Laura Blasi 3, Clara Piccirillo 1, Antonio Cardone 4, Giuseppe Gigli 1,5, Andrea Ragusa 1,6* and Alessandra Quarta 1* 1 CNR NANOTEC—Institute of Nanotechnology, c/o Campus Ecotekne, Lecce, Italy, 2 Dipartimento di Scienze Biomolecolari (DISB), University of Urbino Carlo Bo, Urbino, Italy, 3 CNR, Institute for Microelectronics and Microsystems, Lecce, Italy, 4 Institute of Chemistry of OrganoMetallic Compounds—ICCOM, Italian National Council of Research—CNR, Bari, Italy, 5 Department of Mathematics and Physics E. de Giorgi, University of Salento, Campus Ecotekne, Lecce, Italy, 6 Department of Biological and Environmental Sciences and Technologies, University of Salento, Lecce, Italy Lipid nanovesicles (NVs) are the first nanoformulation that entered the clinical use in oncology for the treatment of solid tumors. They are indeed versatile systems which Edited by: can be loaded with either hydrophobic or hydrophilic molecules, for both imaging and Angela Tino, drug delivery, and with high biocompatibility, and limited immunogenicity. In the present National Research Council (CNR), Italy work, NVs with a lipid composition resembling that of natural vesicles were prepared Reviewed by: Federica Sodano, using the ultrasonication method. The NVs were successfully loaded with fluorophores University of Turin, Italy molecules (DOP-F-DS and a fluorescent protein), inorganic nanoparticles (quantum Alfredo Ambrosone, University of Salerno, Italy dots and magnetic nanoparticles), and anti-cancer drugs (SN-38 and doxorubicin). Monica Terracciano, The encapsulation of such different molecules showed the versatility of the developed University of Naples Federico II, Italy systems. The size of the vesicles varied from 100 up to 300 nm depending on the *Correspondence: type of loaded species, which were accommodated either into the lipid bilayer or into Andrea Ragusa [email protected] the aqueous core according to their hydrophobic or hydrophilic nature. Viability assays Alessandra Quarta were performed on cellular models of breast cancer (MCF-7 and MDA-MB-231). Results [email protected] showed that NVs with encapsulated both drugs simultaneously led to a significant Specialty section: reduction of the cellular activity (up to 22%) compared to the free drugs or to the NVs This article was submitted to encapsulated with only one drug. Lipidomic analysis suggested that the mechanism of Nanobiotechnology, a section of the journal action of the drugs is the same, whether they are free or encapsulated, but administration Frontiers in Bioengineering and of the drugs by means of nanovesicles is more efficient in inducing cellular damage, likely Biotechnology because of a quicker internalization and a sustained release. This study confirms the Received: 31 March 2020 versatility and the potential of lipid NVs for cancer treatment, as well as the validity of the Accepted: 02 June 2020 Published: 03 July 2020 ultrasound preparation method for their preparation. Citation: Keywords: nanovesicle, nanoparticle, doxorubicin, SN-38, breast cancer, lipidomic analysis Zacheo A, Bizzarro L, Blasi L, Piccirillo C, Cardone A, Gigli G, Ragusa A and Quarta A (2020) INTRODUCTION Lipid-Based Nanovesicles for Simultaneous Intracellular Delivery of Hydrophobic, Hydrophilic, and Lipid-based vesicles are the most commonly used carriers for drug delivery in nanomedicine Amphiphilic Species. thanks to their ease of preparation, excellent biocompatibility, and structural plasticity. They are Front. Bioeng. Biotechnol. 8:690. conventionally defined as spherical vesicles characterized by an outer bilayer of lipids with an doi: 10.3389/fbioe.2020.00690 internal aqueous cavity. Since the first description of liposomal formulation, almost 60 years ago, Frontiers in Bioengineering and Biotechnology | www.frontiersin.org 1 July 2020 | Volume 8 | Article 690 Zacheo et al. Nanovesicles for Delivery and Imaging many types of lipid vesicles have been developed for applications and phospholipids (Antimisiaris et al., 2018; Skotland et al., in various areas, including drug and gene delivery (Grimaldi 2019). To demonstrate the high versatility of this system, several et al., 2016). Some of them have been already approved for clinical compounds with different physico-chemical properties (i.e., use in cancer chemotherapy as carriers of pharmaceuticals, such hydrophilic, hydrophobic, and amphiphilic molecules) and as doxorubicin, irinotecan, cisplatin, and placlitaxel (Bulbake dimensions (with molecular weight ranging from few hundreds et al., 2017). Other formulations are currently under clinical Da to hundreds kDa) were encapsulated into the NVs. More evaluation for the delivery of drugs in cancer and other diseases. specifically, inorganic nanocrystals, such as quantum dots (QDs) The considerable research efforts in this area are and magnetic nanoparticles (MNPs), an organic amphiphilic motivated by the numerous benefits provided by the use fluorophore (i.e., DOP-F-DS), the transferrin protein, and two of liposomes, including their ability to host both lipophilic anticancer drugs (i.e., doxorubicin and SN-38) were loaded and hydrophilic molecules, the presence of an aqueous core either into the bilayer or into the core. that can accommodate large compounds, the high affinity Doxorubicin (DOXO) is commonly employed in the with the cell membrane that facilitates their internalization, chemotherapy of several solid tumors and leukemia, especially the biodegradability and the negligible toxicity of the in its lipid-based formulation, the first one to be approved vesicle components. Indeed, they are generally composed for clinical use (Barenholz, 2012). On the other hand, SN-38, of natural lipids; among them, phospholipids, such as namely 7-ethyl-10-hydroxy camptothecin, is a topoisomerase phosphatidylethanolamine and phosphatidylcholine, and I inhibitor used in cancer therapy against solid tumors such sterols, such as cholesterol, have been used as components of the as colon carcinoma, breast, ovarian, and pancreatic cancers bilayer (Li et al., 2019). (Wallin et al., 2008). It is characterized by low water solubility The amount of cholesterol and the length and saturation of the and poor stability in the blood stream. Therefore, high doses are hydrocarbon chains of the phospholipids affect the rigidity and needed in clinical therapy, also causing serious toxic side-effects the stability of the bilayer, and in turn the capability of the NVs in patients. As such, a liposomal formulation of this drug to host and release drugs/biomolecules (Monteiro et al., 2014). would provide its beneficial protection until reaching the target On the other hand, functionalization of the hydrophilic heads site and a prolonged circulation time of the active ingredient of the lipids with polymers or biomolecules, provides additional (Fang et al., 2018). features to the vesicle surface, thus shaping their interaction with The prepared NVs were fully characterized and the thermal blood components, tissues, and the immune system in vivo (Riaz stability, size, morphology, surface charge, and colloidal stability et al., 2018). For instance, surface coating with polyethyleneglycol over time assessed. The efficiency of the drug encapsulation and (PEG) polymer chains has been demonstrated to ameliorate the the effectiveness of the system as anti-cancer carrier were tested colloidal stability of the liposomes and hence their capability on selected human cancer cellular lines—MCF-7 and MDA-MB- to elude the immune system and prolong the circulation time 231. Furthermore, the effect of the two drugs, either free or (Nkanga et al., 2019). loaded into the NVs, on the cancer cells was studied via lipidomic Depending on the preparation method, it is possible to tune analysis. This type of study is gaining increasing attention as it both size and lamellarity of lipid-based vesicles. Conventional can provide valuable information about the changes that occur synthetic approaches, which include film hydration, reverse- upon a particular stimulus, such as drug administration (Zhao phase evaporation, and detergent dialysis, can produce et al., 2015; Perrotti et al., 2016). Lipids are the mayor constituents multilamellar vesicles; however, they suffer from high size of the cellular membrane and they are also involved in many polydispersity and low reproducibility (Kraft et al., 2014). On biological processes strongly related to carcinogenic pathways, the other hand, methods based on the application of mechanical such as transformation, progression, and metastasis, and their forces, such as sonication and homogenization, allow for a composition is altered in many neoplastic diseases (Giudetti finer control of the vesicle’s size and uniformity. More recently, et al., 2019). Nuclear magnetic resonance (NMR) analysis of the microfluidic technologies have been applied to the synthesis of variation in the lipid composition upon drug treatment can thus uniform lipid vesicles (Carugo et al., 2016). provide valuable information about efficacy and progression of In a previous work, we also designed a microfluidic system for the treatment. the preparation of lipid nanovesicles with highly homogeneous size distribution and good reproducibility (Zacheo et al., 2015). However, this method suffers from low particle yield per volume
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