Allogenic adipose-derived stem cell therapy overcomes ischemia-induced microvessel rarefaction in the myocardium: systems biology study
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Myocardial microvascular loss after myocardial infarction (MI) remains a therapeutic challenge. Autologous stem cell therapy was considered as an alternative; however, it has shown modest benefits due to the impairing effects of cardiovascular risk factors on stem cells. Allogenic adipose-derived stem cells (ASCs) may overcome such limitations, and because of their low immunogenicity and paracrine potential may be good candidates for cell therapy. In the present study we investigated the effects of allogenic ASCs and their released products on cardiac rarefaction post MI.
Pig subcutaneous adipose tissue ASCs were isolated, expanded and GFP-labeled. ASC angiogenic function was assessed by the in-vivo chick chorioallantoic membrane (CAM) model. Pigs underwent MI induction and 7 days after were randomized to receive: allogenic ASCs (intracoronary infusion); conditioned media (CM; intravenous infusion); ASCs + CM; or PBS/placebo (control). Cardiac damage and function were monitored by 3-T cardiac magnetic resonance imaging upon infusion (baseline CMR) and 1 and 3 weeks thereafter. We assessed in the myocardium: microvessel density; angiogenic markers (CD105, CD31, TF, VEGFR2, VEGFR1, vWF, eNOS, CD62); collagen deposition; and reparative fibrosis (TGFβ/TβRII/collagen). Differential proteomics of ASCs and CM was performed to characterize the ASC protein signature.
CAM indicated a significant ASC proangiogenic capacity. In pigs after MI, only PBS/placebo animals displayed an impaired cardiac function 3 weeks after infusion (p < 0.05 vs baseline). Administration of ASCs + CM significantly enhanced neovessel formation and favored cardiac repair post MI (p < 0.05 vs the other groups). Molecular markers of angiogenesis were significantly upregulated both at transcriptional and protein levels (p < 0.05). The in-silico bioinformatics analysis of the ASC and CM proteome (interactome) indicated activation of a coordinated protein network involved in the formation of microvessels and the resolution of rarefaction.
Coadministration of allogenic ASCs and their CM synergistically contribute to the neovascularization of the infarcted myocardium through a coordinated upregulation of the proangiogenic protein interactome.
KeywordsAllogenic adipose-derived stem cells Conditioned media Angiogenesis Myocardial infarction Proteomics Systems biology
Adipose-derived mesenchymal stem cell
Chorioallantoic membrane assay
Cardiac magnetic resonance imaging
Endothelial nitric oxide synthase
Fetal bovine serum
Heat shock protein
Ischemic heart disease
Ingenuity pathway analysis
Late Gadolinium enhancement
Left ventricular end-diastolic volume
Left ventricular ejection fraction
Left ventricular end-systolic volume
Mesenchymal stem cell
Protein disulfide isomerase
Transforming growth factor
Toll-like receptor 4
Triphenyl tetrazolium chloride
Vascular endothelial growth factor
Von Willebrand factor
Advances in pharmacological therapy and interventional techniques have increased the rate of survival in patients suffering from acute myocardial infarction (MI) . Yet the development of heart failure at a later time point due to reduced perfusion, microvessel rarefaction, irreversible cardiomyocyte loss and consequent adverse cardiac remodeling has increased dramatically . Implantation of adult stem cells into the ischemic damaged myocardium has been investigated for its potential to repair/regenerate the injured cells within the infarct zone . However, recent systematic review and meta-analysis have evidenced that administration of autologous stem cells exerts modest and limited benefits in ischemic heart disease (IHD) patients . The presence of cardiovascular risk factors and metabolic disorders in cardiac patients seems to negatively influence the effects of adult stem/progenitor stem cells, discouraging their autologous use in the clinical setting . In this regard, allogenic adipose-derived stem cells (ASCs) from obese patients display an impaired angiogenic potential [6, 7] and clustering of risk factors has been shown to reduce ASC and bone-marrow-derived cell pluripotency and self-renewal [8, 9, 10, 11]. The use of allogenic stem cells from healthy donors may overcome these limitations.
In contrast to other adult stem cells, mesenchymal stem cells (MSCs) have been demonstrated to have immunomodulatory and immunosuppressive properties . Moreover, MSCs are considered to be immunoprivileged due to lack of expression of class II major histocompatibility complex and costimulatory molecules on the cell surface  and, consequently, allogeneic administration of MSCs does not stimulate donor-specific alloimmune reactions as shown in several clinical trials [14, 15]. Emerging evidence supports that among all MSCs those derived from the adipose tissue (i.e., ASCs) hold great potential for allogenic use because, in addition to their inherent and proven low immune reactivity [16, 17], they are highly abundant, easily accessible and expandable in culture. Administration of ASCs has so far shown promising results across a wide range of therapeutic applications including bone–cartilage defects, inflammatory-based disease and IHD . In this latter regard, several animal studies seem to indicate that administration of ASCs exerts cardiac beneficial effects as compared with the administration of placebo-control media likely through paracrine/autocrine-related mechanisms [16, 19]. Many experimental studies concur that most of the benefits associated with the administration of ASCs are largely mediated by the actions of cytokines and growth factors secreted by the ASCs rather than by ASC transdifferentiation and engraftment [20, 21, 22, 23]. Because microvessel rarefaction is a common pathogenic landmark in the ischemic myocardium, here we sought to determine in a pig model of MI using clinical standard perioperative procedures (antiplatelet treatment) and operating blindly  whether coadministration of ASCs and conditioned media (CM) could overcome myocardial rarefaction and whether the effects were due to ASCs or their secretome.
Materials and methods are expanded in Additional file 1.
The experimental procedures with animals were reviewed and approved by the Institutional Animal Care and Use Committees (CEEA-ICCC) and authorized by the Animal Experimental Committee of the local government (# 5601) in accordance with Spanish law (RD 53/2013) and European Directive 2010/63/EU.
Pigs (n = 20) were subjected to MI induction. One week post MI, the animals were randomized to receive: ASCs (1 × 107 cells); CM (30 ml); ASCs and their CM; or PBS (control; 30 ml). ASC coronary delivery was performed with an over-the-wire catheter and total balloon occlusion for 2 min. CM was administered intravenously. Cell preparations were administered blindly by the surgical operators. Animals were then brought to the cardiac magnetic resonance imaging (CMR) facilities for baseline CMR measurements (1 week post MI) and were followed-up at 1 and 3 weeks thereafter (2 and 4 weeks post MI, respectively) and then sacrificed.
ASC isolation, characterization and preparation for infusion
Subcutaneous adipose tissue was harvested from the neck of healthy pigs and processed for ASC isolation and expansion under hypoxic conditions . The day before infusion, the expanded ASCs were washed and serum-free medium was added. After 24 h, the secretome of ASCs released to the medium (CM) was collected, centrifuged and filtered. Then 30 ml of sample was kept at 4 °C until infusion. ASCs (1 × 107 cells) were resuspended in 2 ml PBS and kept at 4 °C until intracoronary administration. Previously, ASCs had been characterized by cell surface marker expression by flow cytometry and differentiation potential to mesenchymal cell lineages. Aliquots of ASCs and CM were kept for proteomics.
In-vitro ASC function: proof-of-principle characterization
3D cultures: ASC endothelial cell differentiation was evaluated by capillary network formation with HMEC-1 (microvascular endothelial cells) on coculture in 3D matrigel plugs.
Chorioallantoic membrane assay (CAM) immunofluorescence: fertilized chicken eggs were incubated for 3 days. A small opening was then made in the shell, exposing the CAM. The window was covered with cellophane tape and the eggs were returned to the incubator. Six days later, growth factor-reduced matrigel droplets (containing 105 ASCs, 20 μl concentrated CM (×10) or 105 ASCs + 20 μl concentrated CM) were applied onto the CAM while placement onto big pre-existing blood vessels was avoided. Matrigel droplets containing 20 μl PBS served as negative controls. Following 2 days of incubation the eggs were opened and photographed, and the CAM was carefully dissected and processed for histological analysis against von Willebrand factor (vWF).
Microvesicle release: ASC-GFP+ microvesicles release into the CM were analyzed by flow cytometry.
Experimental model of MI
MI was induced by 90-min total balloon occlusion of the LAD as described previously . All animals underwent transthoracic echocardiography before inducing ischemia and upon reperfusion to monitor the impact of MI induction on LVEF .
GFP-lentiviral transduction of ASCs: assessment of ASC cardiac homing
We performed a substudy (n = 4 pigs) to confirm ASC retention and homing within the infarcted region post infusion. To that end, ASCs were transduced with GFP-expressing lentiviral vectors and 1 × 107ASC-GFP+ cells were intracoronary infused into MI-induced pigs. Animals were sacrificed 24 h later and samples from multiple cardiac regions (left and right ventricle, ischemic and remote myocardium, atrium) and vascular beds (coronary arteries and different aortic regions) were rapidly obtained for GFP detection.
Cardiac magnetic resonance imaging
CMR analysis was performed serially as reported previously  1 week post MI just after ASC, CM, ASC + CM or PBS infusion (baseline), 1 week post infusion (2 weeks post MI) and 3 weeks post infusion (4 weeks post MI). The following CMR sequences were acquired: “cine” (b-SSFP) imaging sequence to assess wall motion and cardiac function; and late gadolinium enhancement (LGE) to assess the amount and extent of myocardial necrosis. CMR images were analyzed using dedicated software by a CMR-trained cardiologist blinded to the study medication .
Assessment of myocardial vascular density and angiogenesis
Neovessel formation was assessed by lectin staining and via the analysis of angiogenic markers including gene levels of CD105, vWF, endothelial nitric oxide synthase (eNOS), vascular endothelial growth factor receptor type 2 (VEGFR2), VEGF1, CD31, CD62 and tissue factor (TF) as well as protein activation and/or expression of eNOS phosphorylated in Thr495, eNOS, CD105 and vWF.
Myocardial fibrosis was assessed at a transcriptional level (analysis of transforming growth factor beta receptor (TGFβR), TGFβ, and collagen type I and type III) and by histological Masson’s trichromic staining.
Proteomic analysis was performed on ASCs and their secretome (CM). For all proteomic analyses, protein extracts were separated by bidimensional gel electrophoresis (2-DE) and protein spots of interest were identified by matrix-assisted laser desorption/ionization–time of flight (MALDI-TOF/TOF) as described previously .
In-silico bioinformatics analysis
The statistically significant functional networks in which the identified proteins were involved were generated through the use of ingenuity pathway analysis (IPA; Ingenuity Systems, www.ingenuity.com). The functional analysis of a network identified the biological function and/or disease that were most significant to the molecules in the network. The network molecules associated with biological functions and/or diseases in the Ingenuity Knowledge Base were considered for the analysis.
The Shapiro–Wilk test was applied to verify the normal distribution of the data and statistical analysis was applied accordingly. Within the porcine studies, data were analyzed by a nonparametric statistical analysis and results are reported as medians and interquartile range (IQR). For independent factors (comparisons between groups) we performed Mann–Whitney analysis; for repeated measurements, Wilcoxon and Friedman analyses were appropriate. For the chicken egg analysis we applied a one-way ANOVA followed by Bonferroni’s multiple comparison test. Finally, for in-silico bioinformatics analysis, a right‐tailed Fisher’s exact test was used to calculate a p value determining the probability that each biological function and/or disease assigned to that network is due to chance alone.
All statistical tests conducted were two-sided and p < 0.05 was considered significant. Statistical analyses were performed with Statview.
Chick CAM model of angiogenesis
As observed in Additional file 3A, GFP was detected by RT-PCR in the LAD and in the layers of the ischemic damaged myocardium (from endocardium to epicardium) at 24 h post delivery of ASCs. In contrast, it was undetectable in the remote myocardium, circumflex and right coronary artery, atria, right ventricle and the aorta. Confocal microscopy analysis revealed the presence of GFP+ cells in the LAD and in the ischemic cardiac tissue (Additional file 3B). GFP+ cells were not detected in the nonischemic myocardium (image not shown).
Cardiac function and damage
Echocardiography revealed that all animals showed a comparable impairment in the left ventricle ejection fraction (LVEF; average 29 (27–30)% decrease) after 90 min of complete coronary ischemia (p < 0.05 vs prior MI). Similarly, no variations were detected in hemodynamic parameters (heart rate and mean blood pressure) during MI induction among all groups (average: 76 (74–76) bpm and 56 (54–56) mmHg, respectively).
MRI analysis of cardiac performance and scar size
(1 week post MI)
1 week post infusion
(2 weeks post MI)
3 weeks post infusion
(4 weeks post MI)
ASCs + CM
ASCs + CM
ASCs + CM
Scar size (g)
ASCs + CM
Markers of neovessel formation
- a)ASC secretome analysis: we performed a comparative proteomic approach between CM and cell-free culture medium (negative control). Fetuin alpha-1 antitrypsin, ApoA-I, serum albumin and serotransferrin were identified in both CM and cell-free culture medium and therefore their presence was attributed to the culture medium (Fig. 8a). As expected, GFP was solely identified in the secretome of ASCs and its detection supported its extracellular release.
- b)ASC proteome analysis: we further analyzed ASC cytosolic and membrane fractions (Fig. 9). Proteins identified in the ASC proteome (Additional file 5) were related to 11 different functional categories: angiogenesis, antioxidant/redox homeostasis, cell proliferation/differentiation/apoptosis regulation, coagulation/hemostasis, defense response, metabolism, protein processing/chaperone activity, proteolysis, signaling/gene transcription, structural and transport/trafficking proteins.
- c)ASC interactome: we analyzed the functional groups of proteins identified in both fractions (CM and ASCs; Additional file 5) in order to determine the potential interactions (i.e., interactome) behind the synergistic effect observed upon ASC + CM administration. Table 2 presents the functional groups of the proteins identified in the ASC-related proteome. We observe that structural proteins are found in both the ASC secretome and the ASC proteome, although with a differential protein contribution of each fraction. Additionally, the ASC secretome mainly contained proteins related to angiogenesis and cell proliferation/differentiation/apoptosis regulation whereas the ASC proteome was mostly represented by proteins involved in protein processing regulation and chaperone activity.Table 2
Functional groups in the ASC interactome and the percentage of identified proteins
Functional group in donor cell
Cell proliferation/differentiation/apoptosis regulation
We further analyzed the functional networks in which the proteins identified in the ASC interactome were involved by performing an in-silico bioinformatic analysis using the IPA software. This analysis revealed that the most representative network in the ASC interactome was related to blood vessel development and neovascularization (Additional file 6).
Common risk factors associated with coronary artery disease have been shown to attenuate the functional activity of progenitor/adult stem cells likely restricting the effectiveness of autologous cell-based therapy. Therefore, delivery of allogenic stem cells with very low immunogenic reactivity may become a therapeutic option to enhance stem cell potential. Among all kind of stem cells, MSCs and, particularly, ASCs exert considerable immunomodulatory properties and exhibit a low immunogenic profile . ASCs have so far demonstrated encouraging data in several preclinical studies and have proven safety in phase I and phase IIb clinical trials [30, 31]. Autologous ASC therapeutic potential is mainly explained by the production of bioactive molecules that mediate neovascularization, cell survival and proliferation . Yet little is known about the mediators involved and their mechanisms of action. Moreover, key questions remain on the best cell-based preparation, delivery method, dosage and timing. In this study we demonstrate, by immunohistochemical and molecular approaches, that both ASCs and their secretome have beneficial effects. Intravenous administration of CM with an intracoronary infusion of ASCs enhances neovessel formation in the ischemic myocardium as compared with the delivery of CM or ASCs alone. We also identify, by proteomic approaches, the protein networks that may potentially contribute to the detected proangiogenic synergistic effect. Finally, we provide evidence of a positive synergistic effect between ASCs and CM over the evolving reparative scar.
Despite relative enthusiasm arising from rodent data, application of MSC therapy has shown limited clinical benefits in the setting of MI. Concerning ASCs, some preclinical studies have reported a slight amelioration in cardiac contractility [32, 33] whereas others have shown no changes in LVEF at 4 weeks post administration [16, 34]. Recent data from the APOLLO and the PRECISE trials (phase I/IIb trials) suggest that administration of ASCs preserves cardiac function [30, 31]. In our study LVEF is preserved in those animals that received intravenous CM and/or intracoronary ASCs 3 weeks post infusion in contrast to placebo-control animals whose cardiac contractility is found to be significantly deteriorated. Moreover, end-systolic and end-diastolic volumes are worse in PBS-control animals as compared with animals administered ASCs or CM, suggesting ASC-related benefits in cardiac contractility and remodeling. Interestingly, results from the present study reveal that a single intravenous delivery of CM obtained from ASCs (1 × 107 cells) exerts similar protective effects to that of ASCs in cardiac performance (CMR detected parameters) but not in the recovery of the rarefaction (loss of microvessels) where the effect is improved by ASCs plus secretome administration. Administration of stem cells capable of directly inducing vessel formation or secreting proangiogenic factors holds great promise to repair the ischemic damaged tissue. The ability of ASCs to promote angiogenesis has been assessed in multiple preclinical MI experimental animal models [16, 17, 19]. In fact, evidence indicates that ASCs have higher angiogenic capacities than bone marrow MSCs [35, 36]. Several reports have suggested that ASCs increase vascularity by differentiation into pericytes (cells capable of stabilizing the microvasculature) both in vitro and in vitro [37, 38] but ASC transdifferentiation into the endothelial cell lineage has not been shown [22, 23, 34], attributing their angiogenic potential to a paracrine activity . We demonstrate through two different in-vivo models that a combination of CM plus ASCs significantly enhances neoangiogenesis as compared with CM or ASCs alone, suggesting a synergistic interaction among ASCs and CM. Indeed, we detect in the ischemic myocardium a significant increase in both microvessel density and the expression of different angiogenic markers. As such, mRNA transcripts and protein levels reveal that, as compared with animals administered ASCs, CM or PBS, pigs treated with ASCs + CM express: a higher amount of VEGFR2 (the receptor of one of the most potent inducers of angiogenesis, VEGF); specific inducers and markers of active neovessel formation (TF and CD105, respectively) ; and a higher number of endothelial cells (P-eNOS, vWF, CD31, CD62) in the ischemic cardiac tissue. Interestingly, however, our results also highlight the ability of ASCs alone to enhance VEGF expression, an effect not observed in CM-alone administered animals. These data indicate a differential contribution of ASCs and CM to neovessel formation, as further discussed in the following.
The increased vascular density and molecular expression of active neoangiogenic/vascular factors detected when combining ASCs and CM at 3 weeks may translate into the amelioration of cardiac contractility in a longer-follow-up period, as seen at 3 months post infusion with autologous cells . Of note, the limited size of infarction with the concomitant mild reduction in ejection fraction may have underestimated the acute potential benefits afforded by ASC + CM administration. Further studies are required to determine the effects of ASCs + CM on LVEF and cardiac remodeling upon a more severe ischemic insult and after longer survival periods.
No consensus exists as per the optimal timing of stem cell administration. We choose a 7-day delay between acute MI and ASC/CM administration based on the following considerations: to closely match clinical trial protocols ; to limit interactions with the “cardiac niche effect” favored by MI (progenitor cell recruitment); and to avoid further acute cardiac damage due to ASC-related coronary plugging . In this respect, intracoronary administration of 1 × 107 ADSCs in pigs has been shown to induce the no-reflow phenomenon  as well as to compromise coronary microcirculation . These observations support the coadministration, by peripheral delivery, of soluble secreted molecules to increase the benefit of ASC therapy, avoiding the risks and detrimental effects associated with the intracoronary infusion of very high amounts of ASCs.
A recent study in pigs, however, has reported that neovascularization is found to be enhanced when ASCs are given early after reperfusion as compared with 1 week later, likely through paracrine effects . Based on our findings which demonstrate a significant enhanced neovascularization when combining ASCs plus CM and taking into consideration that ASC preconditioning with low oxygen levels induces a faster growth and enhances ASC and CM angiogenic potential , the effect of administering ASCs + CM early after revascularization deserves to be investigated.
The complementary proangiogenic effects detected in the ischemic myocardium after the coadministration of ASCs and CM drove the investigation by proteomic approaches of the potential effector molecules. We have identified the presence of angiogenic and inducers of cell proliferation/differentiation in the ASC secretome. Most interestingly, we have identified different and complementary angiogenic proteins in ASCs and CM, supporting the concept of a combined superior effect of ASCs plus CM. The same occurs for proteins related to cell proliferation and differentiation which are critically involved in neovessel formation. As such, annexin A1, a protein known to mediate VEGF-induced endothelial cell migration by regulating the formation of lamellipodia , is only detected in the cytosolic ASC-related fraction whereas peroxiredoxin-1, a protein known to stimulate endothelial cell proliferation and migration by interacting with toll-like receptor 4 (TLR4), is only identified in the ASC secretome . Finally, in contrast to the ASC-related secretome, ASCs provide a high number of proteins implicated in the regulation of protein translation and folding, and with molecular chaperone activity such as heat shock protein (HSP)70-1A and protein disulfide isomerase (PDI) known to be involved in-vivo angiogenesis [45, 46]. Overall, our observations suggest the existence of a synergistic and coordinated protein network in the ASC interactome involved in angiogenesis modulation. Further confirming this hypothesis, in-silico bioinformatic analysis of the ASC interactome clearly shows a key role for ASC-related proteins in angiogenesis (Additional file 6).
Besides angiogenesis, ASCs have been shown to exert anti-inflammatory and anti-apoptotic properties eventually favoring the cardiac healing process . Cardiac repair is ultimately characterized by fibrous tissue deposition at the site of cardiomyocyte loss in order to preserve structural integrity and prevent myocardial rupture (reparative fibrosis), particularly in transmural infarcts such as the ones performed in the present study. This process requires a series of coordinated molecular and cellular events in which the TGFβ/TβRII signaling governs myofibroblast-related collagen deposition . We show that administration of ASCs favors TGFβ/TβRII-related collagen synthesis in the evolving scar, helping to maintain myocardial shape and structure. Interestingly, this effect is found to be enhanced when combining ASCs plus CM, further supporting a synergistic cross-talk between ASCs and their secretome and in line with the proteomic-related functional groups. Indeed, we observe that ASCs secrete multiple structural proteins such as vimentin, tropomyosin and actin which may have contributed to cellular assembly favoring the healing repair process. This was confirmed by in-silico bioinformatic analysis that revealed the implication of several structural proteins together with antiapoptotic and prosurvival effectors in the cellular assembly and organization functional network. Importantly, neither ASCs nor CM induced interstitial reactive fibrosis (i.e., deleterious collagen deposition in nonischemic cardiac tissue leading to adverse cardiac remodeling), in agreement with recent observations in infarcted mice transplanted a construct of multilayered ASC sheets .
Peripheral vein administration of ASC paracrine mediators in combination with local coronary delivery of ASCs synergistically contributes to enhance the neovascularization of the infarcted myocardium through multiple effectors that interact through a complementary and coordinated protein network. Further studies should approach the evaluation of effects at periods longer than 3 weeks. In addition, further studies are needed to ascertain which of the released molecules are endowed with beneficial effects in order to improve delivery of purified paracrine regulators of angiogenesis and neovessel formation.
This work was carried out under the frame of the Doctorate in Medicine of the UAB (MG). The authors gratefully acknowledge the valuable help and support of M.A. Canovas, P. Catalina, J. Moreno, O. García and F.J. Rodriguez with animal handling and for the proper conduct of the experimental, molecular and histological work. Finally, the authors are very thankful to R. Cullel and I. Blanca because of their inestimable contribution in the acquisition of the CMR data and to Prof. Muñoz-Chapuli for his advice on the CAM experiments.
This work was supported by the Spanish Cardiovascular Network of Cell Therapy (Red TerCel RD16/0011/018) and Ciber CV(CB16/11/00411) from the Instituto Salud Carlos III (to LB). Additional funding was received from Plan Nacional de Salud (PNS SAF2016-76819-R to LB, 2015-71653-R to GV) from the Spanish Ministry of Science and Innovation and FEDER funds; from Instituto de Salud Carlos III (CPII13/00012 to GA); and support from a grant from the Muy Ilustrísima Administración from the Hospital de la Santa Creu I Sant Pau (to MG). The authors thank Fundacion Jesus Serra, Barcelona for continuous support.
Availability of data and materials
The datasets during and/or analyzed during the current study are available from the corresponding author on reasonable request.
GV was responsible for design of the study, analysis and interpretation of data, and drafting of the manuscript. BO was responsible for design of the study, acquisition, analysis and interpretation of data, and drafting of the manuscript. JC was responsible for design of the study, and analysis and interpretation of data. MTB was responsible for analysis and interpretation of data. GA was responsible for acquisition, analysis and interpretation of data. EP was responsible for acquisition, analysis and interpretation of data. LC was responsible for analysis and interpretation of data. MG was responsible for analysis and interpretation of data. AC was responsible for analysis and interpretation of data and drafting of the manuscript. GP-LL was responsible for analysis and interpretation of data and drafting of the manuscript. FC was responsible for revising the paper for important intellectual content. AH was responsible for revising the paper for important intellectual content. LB was responsible for conception and design of the study, revising the paper for important intellectual content and final approval of the paper. All authors read and approved the final manuscript.
The authors declare that they have no competing interests.
Consent for publication
Ethics approval and consent to participate
The study protocol was approved by the institutional ethics committee and followed the according European and NIH guidelines. The study have also followed the ARRIVE guidelines and accordingly used the minimal number of animals to reach statistical significance .
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