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      Extracellular Vesicles Derived from Induced Pluripotent Stem Cells Promote Renoprotection in Acute Kidney Injury Model

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          Abstract

          Induced pluripotent stem cells (iPSC) have been the focus of several studies due to their wide range of application, including in cellular therapy. The use of iPSC in regenerative medicine is limited by their tumorigenic potential. Extracellular vesicles (EV) derived from stem cells have been shown to support renal recovery after injury. However, no investigation has explored the potential of iPSC-EV in the treatment of kidney diseases. To evaluate this potential, we submitted renal tubule cells to hypoxia-reoxygenation injury, and we analyzed cell death rate and changes in functional mitochondria mass. An in vivo model of ischemia-reperfusion injury was used to evaluate morphological and functional alterations. Gene array profile was applied to investigate the mechanism involved in iPSC-EV effects. In addition, EV derived from adipose mesenchymal cells (ASC-EV) were also used to compare the potential of iPSC-EV in support of tissue recovery. The results showed that iPSC-EV were capable of reducing cell death and inflammatory response with similar efficacy than ASC-EV. Moreover, iPSC-EV protected functional mitochondria and regulated several genes associated with oxidative stress. Taken together, these results show that iPSC can be an alternative source of EV in the treatment of different aspects of kidney disease.

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          Most cited references40

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          Superoxide radical and superoxide dismutases.

          O2- oxidizes the [4Fe-4S] clusters of dehydratases, such as aconitase, causing-inactivation and release of Fe(II), which may then reduce H2O2 to OH- +OH.. SODs inhibit such HO. production by scavengingO2-, but Cu, ZnSODs, by virtue of a nonspecific peroxidase activity, may peroxidize spin trapping agents and thus give the appearance of catalyzing OH. production from H2O2. There is a glycosylated, tetrameric Cu, ZnSOD in the extracellular space that binds to acidic glycosamino-glycans. It minimizes the reaction of O2- with NO. E. coli, and other gram negative microorganisms, contain a periplasmic Cu, ZnSOD that may serve to protect against extracellular O2-. Mn(III) complexes of multidentate macrocyclic nitrogenous ligands catalyze the dismutation of O2- and are being explored as potential pharmaceutical agents. SOD-null mutants have been prepared to reveal the biological effects of O2-. SodA, sodB E. coli exhibit dioxygen-dependent auxotrophies and enhanced mutagenesis, reflecting O2(-)-sensitive biosynthetic pathways and DNA damage. Yeast, lacking either Cu, ZnSOD or MnSOD, are oxygen intolerant, and the double mutant was hypermutable and defective in sporulation and exhibited requirements for methionine and lysine. A Cu, ZnSOD-null Drosophila exhibited a shortened lifespan.
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            Biodistribution of mesenchymal stem cell-derived extracellular vesicles in a model of acute kidney injury monitored by optical imaging

            Mesenchymal stem cells (MSCs) contribute to the recovery of tissue injury, providing a paracrine support. Cell-derived extracellular vesicles (EVs), carrying membrane and cytoplasmatic constituents of the cell of origin, have been described as a fundamental mechanism of intercellular communication. We previously demonstrated that EVs derived from human MSCs accelerated recovery following acute kidney injury (AKI) in vivo. The aim of the present study was to investigate the biodistribution and the renal localization of EVs in AKI. For this purpose, two methods for EV labeling suitable for in vivo tracking with optical imaging (OI), were employed using near infrared (NIR) dye (DiD): i) labeled EVs were generated by MSCs pre-incubated with NIR dye and collected from cell supernatants; ii) purified EVs were directly labeled with NIR dye. EVs obtained with these two procedures were injected intravenously (i.v.) into mice with glycerol-induced AKI and into healthy mice to compare the efficacy of the two labeling methods for in vivo detection of EVs at the site of damage. We found that the labeled EVs accumulated specifically in the kidneys of the mice with AKI compared with the healthy controls. After 5 h, the EVs were detectable in whole body images and in dissected kidneys by OI with both types of labeling procedures. The directly labeled EVs showed a higher and brighter fluorescence compared with the labeled EVs produced by cells. The signal generated by the directly labeled EVs was maintained in time, but provided a higher background than that of the labeled EVs produced by cells. The comparison of the two methods indicated that the latter displayed a greater specificity for the injured kidney.
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              Selenoprotein P-expression, functions, and roles in mammals.

              Selenoprotein P (Sepp1) is a secreted protein that is made up of 2 domains. The larger N-terminal domain contains 1 selenocysteine residue in a redox motif and the smaller C-terminal domain contains the other 9 selenocysteines. Sepp1 isoforms of varying lengths occur but quantitation of them has not been achieved. Hepatic synthesis of Sepp1 affects whole-body selenium content and the liver is the source of most plasma Sepp1. ApoER2, a member of the lipoprotein receptor family, binds Sepp1 and facilitates its uptake into the testis and retention of its selenium by the brain. Megalin, another lipoprotein receptor, facilitates uptake of filtered Sepp1 into proximal tubule cells of the kidney. Thus, Sepp1 serves in homeostasis and distribution of selenium. Mice with deletion of Sepp1 suffer greater morbidity and mortality from infection with Trypanosoma congolense than do wild-type mice. Mice that express only the N-terminal domain of Sepp1 have the same severity of illness as wild-type mice, indicating that the protective function of Sepp1 against the infection resides in the N-terminal (redox) domain. Thus, Sepp1 has several functions. In addition, plasma Sepp1 concentration falls in selenium deficiency and, therefore, it can be used as an index of selenium nutritional status.
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                Author and article information

                Journal
                Cells
                Cells
                cells
                Cells
                MDPI
                2073-4409
                17 February 2020
                February 2020
                : 9
                : 2
                : 453
                Affiliations
                [1 ]Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, 21941-902 Rio de Janeiro, Brazil; federica.collino@ 123456unipd.it (F.C.); jarlenelopes@ 123456biof.ufrj.br (J.A.L.); giovanegt@ 123456gmail.com (G.G.T.); tais@ 123456cenabio.ufrj.br (T.H.K.-B.); gugaclopes@ 123456hotmail.com (G.M.C.L.); douglas-7451@ 123456hotmail.com (D.B.A.);
                [2 ]National Institute of Science and Technology for Regenerative Medicine-REGENERA, Federal University of Rio de Janeiro, 21941-902 Rio de Janeiro, Brazil
                [3 ]Department of Biomedical Sciences, University of Padova, 35131 Padua, Italy
                [4 ]National Center for Structural Biology and Bioimaging/CENABIO, Federal University of Rio de Janeiro, 21941-902 Rio de Janeiro, Brazil
                [5 ]Department of Medical Sciences, Molecular Biotechnology Center, University of Torino, 10126 Torino, Italy; marta.tapparo@ 123456gmail.com
                [6 ]Department of Pediatrics’ Section of Pediatric Nephrology, Tulane University School of Medicine, New Orleans, LA 70112, USA
                [7 ]Department of Molecular Biotechnology and Health Sciences, University of Torino, 10126 Turin, Italy benedetta.bussolati@ 123456unito.it (B.B.)
                [8 ]National Institute of Science and Technology of Structural Biology and Bioimaging-INBEB, Federal University of Rio de Janeiro, 21941-902 Rio de Janeiro, Brazil
                [9 ]Graduate Program of Translational Biomedicine/BIOTRANS, Grande Rio University, 25071-202 Duque de Caxias, Brazil
                Author notes
                [* ]Correspondence: avieyra@ 123456biof.ufrj.br (A.V.); lindoso@ 123456biof.ufrj.br (R.S.L.); Tel.: +55-21-3938-6521 (A.V.); +55-21-3938-6520 (R.S.L.)
                Author information
                https://orcid.org/0000-0002-3619-7701
                https://orcid.org/0000-0002-3663-5134
                https://orcid.org/0000-0002-8009-7273
                https://orcid.org/0000-0002-7297-0781
                Article
                cells-09-00453
                10.3390/cells9020453
                7072760
                32079274
                0a67442b-f7b5-411a-893d-2c8b1b63513d
                © 2020 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 24 November 2019
                : 12 February 2020
                Categories
                Article

                ipsc,extracellular vesicles,aki,mitochondria,ros,kidney
                ipsc, extracellular vesicles, aki, mitochondria, ros, kidney

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