Extracellular Vesicle in vivo Application
This is an entry on the in vivo therapeutic applications of Mesenchymal stem/stromal cell derived Extracellular vesicles (MSC-EVs). The immunomodulatory and regenarative properties of this cell free product will be analyzed in preclinical aniomal models of immune-mediated diseases (graft versus host disease) and orga injury (lung, kidney, skin)
Extracelluar Vesicles (EVs), mediators of multiple biological functions, are released by almost all cells under physiological and/or pathological conditions, and when cellular activation or stress is present . EVs, characterized by a phospholipid bilayer membrane, consist of particles with different size, defined as medium/large-sized EVs (m/lEV enriched in microvesicles) if ranging from 100 to 1000 nm or small EVs (sEV, enriched in exosomes) if ranging from 20 to 100 nm . MVs are budded from the parental cell membrane and can contain microRNAs, mRNAs, proteins and mitochondria. sEVs have endosomal biogenesis and can be composed of lipids, proteins, and nucleic acids. We will focus on clinical applications of EV-derived from in vitro expanded Mesenchymal Stem/Stromal cells (MSCs), indicating that parental cells may have both cell-renewal (stem) and immunomodulatory capacities (stromal) . Since the pioneer transplantations of MSCs have been documented, a huge amount of studies have been reporting the beneficial effects of these cells in different clinical applications, due to either their ability to modulate the immune response or their capacity to differentiate into several lineages, being so far a relevant source for the therapy of pathologies characterized by inflammation and degenerative processes . Moreover, MSC capability to trans-differentiate in endothelial cells and produce pro-angiogenic factors has allowed to investigate their use in tissue regeneration (i.e. ischemic tissues) . In the last years, the beneficial effects have been hampered by the possible, not to be excluded a priori, capacity that transplanted MSCs may unexpectedly differentiate or uncontrollably grow in the host , opening a scenario of still unknown complications for the receiver. These possible events lead the scientists to better investigate for in vivo cell free therapies. Initially, the therapeutic effects of MSCs were attributed to their capability to engraft in damaged tissues, however it has been shown that only a small proportion of infused MSCs reach the targets and several recent studies well documented how they exert their beneficial effects through a paracrine action by the release of EVs . The MSC-EVs may reach distant sites taking advantage of extracellular fluids and mediate immune responses or tissue regeneration by different mechanisms of action, including the interaction with membrane specific receptors and/or the direct fusion of EV membrane with target cell followed by the release of biological compounds in the cytosol . Preclinical studies are showing that MSC-EVs have therapeutic effects quite comparable or even better than those obtained with transplanted MSCs . The actual translation of MSC-EVs to the clinical stage still needs to be defined. In particular, several issues have to be investigated such as MSC-EV sources (adult or neonatal tissue), method of EV enrichment and characterization, dosage and route of administration . Nevertheless, MSC-EVs are candidates to become an actual alternative for clinicians in the near future. This may lead to a number of advantages such as the prevention of possible immune reaction against heterologous MSCs, or the formation of ectopic tissue and/or tumor masses, therefore improving the safety in clinical setting. In addition, the number of curable pathologies would be increased by the fact that MSC-EVs are able to cross the blood brain barrier .
2. EV Applications in Prevention or Treatment of Acute and Chronic Graft Versus Host Disease
3. EV applications in Acute and Chronic Kidney Disease
A large percentage of patients with Acute Kidney Injury (AKI) or Chronic Kidney Disease (CKD) undergoes to renal failure, requiring hemodialysis or even kidney transplantation . Several preclinical studies are available regarding the use of EVs as therapeutic approach . In a number of studies, in vivo models describe the positive effect of EVs, ascribed to their regenerative tissue and immunoregulation capacities. These results have been obtained with heterogeneous experimental settings. EVs were derived from MSCs of different tissues, such as BM , cord blood , Warton’s Jelly , renal , liver , or urine . Different doses and schedules were also applied; the routes of administration included the tail infusion, the organ perfusion, or the direct administration in the kidney . Different approaches in the induction of AKI and CKD animal models were also adopted . We will focus on preclinical approaches where human BM-MSCs were the source of EVs. Gatti et al. reported the beneficial effect of BM-MSC-EVs in favoring the recovery of AKI and CKD induced by ischemia–reperfusion injury. The EVs content was represented by mRNAs and miRNAs. Even in this study, the organ tissue repair was derived from inhibition of cellular apoptosis and stimulation of tubular epithelial cell proliferation. The same group, investigated the effects of BM-MSC-EVs administered in single or multiple doses in AKI SCID mouse model. Renal function was improved by single administration, but was normalized only after multiple injections. The protection was mainly ascribed to an anti-apoptotic effect of EVs. Many other preclinical studies are reported in literature supporting that the therapeutic effect of MSC-EVs in kidney diseases is due to the transfer of miRNAs, with activation of cell proliferation and survive of kidney tubular cells. (Figure 2).
4. EV applications in lung injury
Lung injury is characterized by severe airway inflammation with activation of alveolar epithelial cells, macrophages, pulmonary microvascular endothelial cells, and neutrophils bringing to tissue damages. The inflammatory response can be caused by inhalation of toxic particles or by infection. The consequences are acute or chronic pulmonary diseases, often with few clinical treatments available, characterized by difficulty in breathing and reduced pulmonary functions . Due to their already mentioned capacities to modulate the immune response and to attenuate the tissue damages, observed in several preclinical studies , EVs have been proposed for clinical application in this context. In an endotoxin-induced mouse model of acute lung injury (ALI), the intratracheal administration of BM-MSC-EVs induced a decrease in inflammatory cytokines produced by neutrophils and macrophages. The result was a reduction in pulmonary edema and lung protein permeability . Several data are consistent with therapeutic properties of MSC-EV early administration in experimental models of bronchopulmonary dysplasia (BPD) . However, Willis et al.  demonstrated that even late infusion of EVs derived from Wharton's Jelly-MSCs restored lung architecture, decreased pulmonary fibrosis and blood vessel loss in an experimental model of neonatal BPD. The interesting conclusion of the study was that EV infusions were effective not only to prevent the development of BPD but also to provide beneficial effects in established BPD. MSC-EVs were also tested in an animal model of allergic airway inflammation, where EVs resulted as effective as the parental MSCs in mitigating Th2/Th17-mediated allergic airway inflammation, with the reduction of pro-inflammatory cytokines in bronchoalveolar fluid . Mechanical ventilation is the main supportive treatment of acute respiratory distress syndrome (ARDS), but it may lead to ventilator-induced lung injury (VILI). Recently, AT-MSC-EVs were administered by a small mechanical ventilator in a VILI mouse model. The study reported the protective effect on VILI of EV miR-146a in reducing the expression of pro-inflammatory cytokines by inhibiting Toll-Like Receptor 4 pathway, leading to the inhibition of calcium channel TRPV4 and extracellular calcium influx . (Figure 3).
5. EV applications in skin wound repair
Skin wound healing is characterized by four stages: (i) hemostasis; (ii) inflammation; (iii) proliferation; and (iv) maturation/remodeling . For their capacity to control inflammation, activate angiogenesis, stimulate cell migration and proliferation, as well as to modulate the cellular differentiation, EVs can act in each of these phases . In a severe burned skin rat model it has been demonstrated that human UC-MSC-EVs attenuated burn-induced inflammation. The infusion of EVs reduced the macrophage production of TNF-α and IL-1β and increased IL-10 levels. These observations were described as the result of the miR-181c transfer from EVs to macrophages, leading to the suppression of the Toll like receptor 4 signaling pathway and of the inflammatory response . Ferreira et al. showed in in vitro experiments that AT-MSC-EVs co-cultured with fibroblasts and keratinocytes enhanced cell proliferation, while the increase of cell migration was demonstrated by scratch wound healing assays. These key processes in skin wound healing are due to the activation of AKT pathway, one of the major biochemical processes regulating migration of epithelial cells. Moreover the EV effect on wound healing was evaluated in a excisional rat wound model, where topical application of MSC-EVs determined an acceleration of the process. All these data were confirmed in a subsequent study, where AT-MSC-EVs differentially expressed 292 out of 333 miRNAs (199 up-regulated, 92 down-regulated) able to inhibit genes NPM1, PDCD4, CCL5, and NUP62, and contributing to the regeneration of skin fibroblasts . In an experimental rabbit model of skin wound, locally injected EVs obtained from BM- and AT-MSCs, induced tissue restoration even better than MSC treatment. Moreover, in this model, the reparative action of AT-EVs resulted significantly better than that of BM-EVs . (Figure4).
Figure 4. MSC-EV mechanisms of action in skin wound healing (h = human; m = murine).
MSC-EVs are considered by the scientific community an acellular biological product potentially interesting for therapies, with a number of advantages with respect to MSCs. MSC-EVs have a low immunogenicity, long half life, in vivo stability and a high efficacy of delivery because they are small and circulate readily, whereas the most of MSCs are trapped in the capillary bed of the lungs. In addition, their use avoids the transfer of cells which may have mutated or damaged DNA. However, there are still a number of critical parameters that need to be standardized, including production, purification, characterization and storage of EVs. Additional important issues are the sources of EV originating cells, the total amount to be delivered and the route of EV administration
The entry is from 10.3390/diagnostics10120999
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