Bmscs pre-treatment ameliorates inflammation-related tissue destruction in lps-induced rat dic model
Bmscs pre-treatment ameliorates inflammation-related tissue destruction in lps-induced rat dic model"
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ABSTRACT This study aimed to investigate the effect of bone marrow-derived mesenchymal stem cells (BMSCs) on disseminated intravascular coagulation (DIC) model rats and to further explore
the underlying mechanism. A rat model of lipopolysaccharide (LPS)-induced DIC was successfully established, as indicated by impaired plasma hemostatic parameters and damaged organ functions
in rats. Importantly, pre-treatment with rat allogeneic BMSCs before LPS injection significantly alleviated systemic intravascular coagulation, reduced plasma levels of organ dysfunction
indicators and pro-inflammatory cytokines, suppressed fibrin microthrombi formation, ameliorated liver, heart, and renal injuries, and increased 24-hour survival rates in LPS-induced DIC
rats. The protection of BMSCs against DIC was in a moderately dose-dependent manner. Further investigation revealed that BMSCs co-cultured with peripheral blood mononuclear cells (PBMCs)
significantly inhibited the LPS-stimulated PBMCs proliferation and the release of pro-inflammatory cytokines from PBMCs. Of note, upregulation of immunosuppressive factors including
indoleamine 2,3-dioxygenase and interleukin-10, which was induced by interferon-γ, contributed to BMSCs-mediated inhibition of LPS-stimulated PBMCs proliferation. These effects do not depend
on the direct cell–cell contact. In conclusion, BMSCs pre-treatment ameliorates inflammation-related tissue destruction in LPS-induced DIC model rats. The protection of BMSCs may be
attributed to their anti-inflammatory and immunomodulatory properties, which render BMSCs a promising source for stem cell-based therapeutic approaches in inflammation-related DIC. SIMILAR
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Article Open access 23 February 2022 INTRODUCTION Disseminated intravascular coagulation (DIC) is a devastating clinical condition caused by unbalanced activation between coagulation and
fibrinolysis1. It typically occurs as an acute complication in patients with underlying life-threatening illnesses, such as severe infection, severe sepsis, solid or hematologic
malignancies, severe trauma, placental abruption, and obstetric calamities2. DIC is characterized by systemic activation of coagulation, potentially leading to thrombotic obstruction of
small and midsize vessels, thereby contributing to multiple organ failure (MOF)3. MOF involves disturbed microcirculation owing to the formation of numerous microthrombi in several organs
and is one of the most common complications of DIC4. The pathophysiology of DIC is multifactorial involving intertwined feedback loops between the coagulant, immune, and inflammatory
pathways5. Although DIC is a serious disease, there is no gold standard for its diagnosis, no single biomarker by which DIC can be clearly diagnosed, and no anticoagulants have been
recommended for the treatment of DIC in worldwide6. Mesenchymal stem cells (MSCs) are multipotent non-hematopoietic progenitor cells that can differentiate into bone marrow stromal cells,
adipocytes, osteoblasts, chondrocytes, tenocytes, neurons, skeletal myocytes, and cells of visceral mesoderm7,8. MSCs have become promising candidates for the development of novel allogeneic
cell-based therapeutic strategies in harnessing inflammation in the repair or regeneration of various damaged tissues9,10. Until now, most cell-based therapies were conducted using the
well-characterized bone marrow-derived MSCs (BMSCs). Growing evidence has revealed that BMSCs display profound immunomodulatory and anti-inflammatory capacities11,12,13. Furthermore, BMSCs
can exert immunosuppressive and anti-inflammatory effects both in vitro and in vivo by inhibiting the proliferation and function of innate and adaptive immune cells, such as natural killer
(NK) cells, dendritic cells, and T and B lymphocytes14,15,16,17. To date, various studies have demonstrated that soluble factors including transforming growth factor β1 (TGF-β1),
interleukin-10 (IL-10), cyclooxygenase-2 (COX-2), inducible nitric oxide synthase (iNOS), indoleamine 2,3-dioxygenase (IDO), and hepatocyte growth factor (HGF), either produced
constitutively by MSCs or as a result of cross-talk with target immune cells, have been attributed to the immunomodulatory properties of MSCs18. Interestingly, the pro-inflammatory cytokine
interferon-γ (IFN-γ), secreted by activated T cells, is capable of regulating the immunomodulatory functions of BMSCs via regulation of a variety of immunosuppressive factors, including
COX-2, iNOS, IDO, and IL-107,19,20. In addition, the unique immunomodulatory and anti-inflammatory effects of MSCs have been demonstrated in several animal disease models related to
inflammation, such as bowel disease18, periodontitis21, and sepsis22. Taken together, these observations have provided convincing evidence that BMSCs-based therapy may be potential for the
treatment of DIC. The aim of present study was to investigate the in vivo effect of BMSCs pre-treatment on inflammation-related DIC rat model induced by lipopolysaccharide (LPS) and to
explore whether their anti-inflammatory protection of BMSCs against DIC was associated with their immunomodulatory effect on peripheral blood mononuclear cells (PBMCs) proliferation.
MATERIALS AND METHODS ANIMALS Adult pathogen-free male Wistar rats (6–7 weeks old, weighing 160–170 g) were obtained from the Laboratory Animal Center of Shandong University (Jinan,
Shandong, China). The experimental procedures were approved by the Animal Care and Use Committee of Shandong University. All rats were kept per cage with free access to food and water, and a
12/12 h light/dark cycle, with an ambient temperature of 20–25 °C. ISOLATION AND CULTURE OF BMSCS Isolation of BMSCs from Wistar rats was performed according to our previous studies23. The
morphological characteristics of BMSCs were examined using an inverted microscope. 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay was performed to draw the growth curve
of the BMSCs cultured for 1–8 days as previously described24. Flow cytometry and differentiation assays were carried out according to our previous studies23 to verify BMSCs based on
established criteria25. The fourth passage BMSCs were used in subsequent experiments. EXPERIMENTAL DIC MODELS The establishment DIC rat model was performed according to the methods described
by our previous studies23,26. Rats were anesthetized with an intraperitoneal injection of pentobarbital sodium salt (30 mg/kg, Sigma-Aldrich). Experimental DIC models were treated with
sustained intravenous infusion of 3 mg/kg LPS diluted in 1 ml saline for 1 h via the tail vein. The control group was injected with the same volume of saline. The laboratory diagnosis of DIC
in rats was performed according to a previous study27. PRE-TREATMENT WITH ALLOGENEIC BMSCS IN RATS Sixty male rats were randomly divided into five treatment groups and one control group
(_n_ = 10/group). (1) Control: rats were pre-treated with 1 ml culture medium (vehicle of allogeneic BMSCs) and then administered a sustained intravenous infusion of 1 ml normal saline
(vehicle of LPS) for 1 h via tail vein; (2) LPS: rats were pre-treated with 1 ml culture medium and then treated with a sustained intravenous infusion of 3 mg/kg LPS diluted in 1 ml saline
for 1 h via tail vein; (3) LPS + BMSCs: rats were pre-treated with 1 × 103, 1 × 104, 1 × 105, and 1 × 106 allogeneic BMSCs in 1 ml cultured medium via tail vein for 3 consecutive days (three
times at intervals of 24 h) before LPS injection. LPS was injected via tail vein at the end of 24 h after last BMSCs injection. PARAMETER MEASUREMENT The blood sample was withdrawn from the
abdominal aorta at 0 h (before), 2 h, 4 h, and 6 h after LPS injection. Platelet (PLT) counts were performed with an automated device for animals (Celltac, MEK-5128, Nihon Kohden Co.,
Tokyo, Japan). d-dimer levels were determined by the quantitative latex agglutination test (Diatron, Tokyo, Japan). Fibrinogen (Fib) levels, activated partial thromboplastin time (APTT), and
prothrombin time (PT) were measured using an ACL-9000 Coagulation Analyzer. Plasma levels of creatinine (Cr), alanine aminotransferase (ALT), and creatinine kinase-MB (CK-MB) were measured
with commercially available kits (Sigma) with a fully automated clinical chemistry analyzer (Hitachi 912, Boehringer Mannheim, Germany) according to manufacturer’s instructions. Plasma
levels of endothelin (ET) were determined with a commercial enzyme-linked immunosorbent assay (ELISA) kit (Wako, Osaka, Japan). HISTOPATHOLOGY After experiments, the rats were killed and
their organs (including the heart, liver, and kidney) were harvested and prepared for histological studies. A part of the sections were stained with hematoxylin and eosin (HE), and the
others were stained with phosphotungstic acid hematoxylin (PTAH) according to the routine staining procedure. Fibrin was red-stained in HE staining and violet blue-stained in PTAH staining.
They were examined under a light microscope (Olympus, Japan). Quantitative evaluation of the heart injury was performed according to a pathologic score system (neutrophil infiltration,
hemorrhage, and necrosis) ranging from 0 (normal) to 6 (severe) as previously described28. Liver injury of each section was assessed according to Suzuki’s criteria29, which accounts for the
following three separate criteria: vascular congestion, hepatocyte vacuolization, and necrosis. The scores from 0 (none) to 4 (severe) for each of the three criteria were then combined,
leaving a combined liver injury score ranging from 0 (normal) to 12 (severe). Quantitative evaluation of the renal injury was performed based on histological parameters: tubular necrosis,
interstitial edema, loss of brush border, and casts formation. The scoring system used was 0, absent; 1, present; and 2, marked, as described previously30. A minimum of 10 fields for each
section were examined and assigned for the severity of changes. Blinded analysis of the histological samples was performed by two experts (Department of Cardiovascular Surgery, Qilu Hospital
of Shandong University). CYTOKINE ANALYSIS BY ELISA The levels of IL-1β, IL-10, tumor necrosis factor-α (TNF-α), and IFN-γ in the cell supernatant after 72 h of incubation and plasma levels
of TNF-α, IFN-γ, and IL-1β were determined by ELISA kits purchased from R&D Systems (Minneapolis, MN, USA). All conditions were performed in triplicate. ISOLATION OF PBMCS Fresh blood
(4 ml) was drawn from the rat inferior vena cava at the end of 24 h after last BMSCs injection. Next, blood was heparinized for the isolation of PBMCs by a Ficoll-Hypaque density gradient
centrifugation. In brief, the mixture of lymphocyte isolation liquid (Ficoll, GE Healthcare Bioscience, Piscataway, New Jersey, USA), serum-free RPMI 1640 (Gibco, USA), and fresh blood (1:
1: 1, v/v/v) was centrifuged at 2000 × _g_ for 20 min at 25 °C. After that, the mononuclear cell layer (white layer) was carefully aspirated by a syringe and re-suspended in 3 ml of RPMI
1640 medium containing 10% fetal calf serum (FCS, Hyclone, USA). The active PBMCs accounted for 95% after trypan blue dyeing. PBMCs were finally adjusted the concentration of 2 × 106/ml.
TREATMENT WITH ALLOGENEIC BMSCS AND LPS IN PBMCS PBMCs isolated from Wistar rats were randomly divided into six treatment groups and one control group for co-culture with BMSCs under LPS
stimulation. (1) PBMCs (control): PBMCs (100 μl, 2 × 106/ml) + RPMI 1640 medium/10% FCS (100 μl); (2) PBMCs + LPS: PBMCs (100 μl, 2 × 106/ml) + RPMI 1640 medium/10% FCS (100 μl) + LPS (final
concentration, 0.5 μg/ml, Difco Laboratory, USA); (3–6) PBMCs + LPS + BMSCs (1 × l02/1 × l03/1 × l04/1 × l05): PBMCs (100 μl, 2 × 106/ml) + BMSCs (corresponding 1 × l03/1 × l04/1 × l05/1 ×
l06/ml, 100 μl) + LPS (final concentration, 0.5 μg/ml). PBMCS PROLIFERATION ASSAY 3H-TdR incorporation assay was performed to evaluate the proliferation capacity of PBMCs isolated from
Wistar rats in co-culture with or without LPS or BMSCs. In brief, PBMCs were plated into 96-well plates (2 × 106/ml, 200 μl/well) and treated with or without BMSCs isolated from rats,
IL-10-neutralizing antibody (cat. no MAB417, 10 μg/ml, R&D Systems), TGF-β1-neutralizing antibody (cat. no. 1D11, 10 μg/ml, R&D Systems), indomethacin (a COX-2 inhibitor, cat. no.
9758, 20 μM, Sigma-Aldrich), l-NAME (_N_-nitro-l-arginine methyl ester, an iNOS inhibitor, cat. no. M18168, 1 mM, Meryer, China), 1-MT (1-methyl-l-tryptophan, an IDO inhibitor, cat. no.
860646, 500 μM, Sigma-Aldrich), and antibody IFN-γ (cat. no. ab133566, Abcam, USA) followed by the stimulation of LPS (0.5 μg/ml, Difco Laboratory, USA) or not. After 72 h of incubation, 20
μl 3H-TdR (10 μci/ml) was added into each well for 8 h of incubation. PBMCs were harvested onto glass fiber filter paper, and the counts per minute were determined using a Wallac TriLux 1450
MicroBeta microplate scintillation counter (PerkinElmer, Waltham, MA, USA). All conditions were performed in triplicate. WESTERN BLOT Protein was isolated from BMSCs and subjected to
western blot analysis as previously described18. Results were analyzed using Alpha View Analysis Tools (AlphaViewSA software version 3.2.2, ProteinSimple, Santa Clara, CA). β-actin served as
the loading control. DETECTION OF IDO ENZYMATIC ACTIVITY IDO activity was analyzed by measuring the concentration of kynurenine in BMSCs culture in response to IFN-γ (PeproTech) or
co-culture with PBMCs in the absence or presence of 0.5 μg/ml LPS using a high-pressure liquid chromatography technique according to a previous study31. STATISTICAL ANALYSIS Data were
expressed as mean ± standard deviation from three independent experiments. Statistical analyses were performed using SPSS statistical software package standard version 16.0 (SPSS, Inc.,
Chicago, IL, USA). Experiments were performed in triplicate. Statistical differences between two independent groups were determined using Student’s _t_ test. For multiple groups, the
statistical analyses were performed by one-way ANOVA followed by Tukey’s test. Survival analysis was performed by using the Kaplan–Meier method. _P_ < 0.05 was considered to indicate a
statistically significant difference. RESULTS CULTURE AND IDENTIFICATION OF BMSCS FROM WISTAR RATS Cultured BMSCs from Wistar rats were observed to be round or oval following inoculation.
After a serial passage of adherent cells, a homogeneous population of spindle-shaped cells proliferated to form colonies (Supplementary Figure 1A). BMSCs displayed vigorous growth
(Supplementary Figure 1B). The surface makers of the fourth passage BMSCs were analyzed by flow cytometry. The immunophenotypes of these cells were persistently positive for CD29, CD44,
CD10, and CD106, but negative for CD34 and CD45 (Supplementary Figure 1C). When exposed to the endothelial medium, the cells expressed the specific marker of von Willebrand factor
(Supplementary Figure 1D). Furthermore, the BMSCs differentiated into osteoblastic cells, as judged by their ability to mineralize the extracellular matrix (Supplementary Figure 1E).
Moreover, when exposed to an adipogenic stimulus, the cells displayed an adipocyte phenotype and accumulation of neutral lipid droplets in the cytoplasm (Supplementary Figure 1F). These
results indicated that the obtained BMSCs conformed to the well-established criteria. BMSCS PRE-TREATMENT ALLEVIATES SYSTEMIC INTRAVASCULAR COAGULATION, ATTENUATES ORGAN DYSFUNCTION, AND
REDUCES PRO-INFLAMMATORY CYTOKINES Plasma PLT counts and Fib concentrations in the rats were significantly decreased at 2 h, 4 h, and 6 h after LPS administration as compared to the control
group (Fig. 1a, b). In contrast, a simultaneous significant increase of d-dimer, PT, and APTT after LPS administration for 2 h, 4 h, and 6 h was observed (Fig. 1c–e). These changes in plasma
markers for DIC demonstrated that the DIC rat model was successfully established. To investigate the effect of BMSCs pre-treatment on systemic intravascular coagulation, we then detected
the changes of plasma markers for DIC. Data showed that pre-treatment with BMSCs dramatically increased PLT counts and Fib concentrations as compared with the LPS group (Fig. 1a, b).
However, plasma d-dimer levels in the BMSCs pre-treatment groups were significantly decreased compared with those in the LPS group (Fig. 1c). In addition, APTT and PT in LPS-induced DIC rat
model group were notably shortened by pre-treatment with BMSCs (Fig. 1d, e). These results indicated that pre-treatment with BMSCs alleviated systemic intravascular coagulation. Meanwhile,
this protective effect was moderately BMSCs dose dependent. To investigate whether BMSCs pre-treatment has the effect to protect the organ function in LPS-induced DIC model, we measured the
plasma levels of several organ function indicators. Data revealed that the plasma concentrations of Cr (a marker of renal injury; Fig. 1f), ALT (a marker of liver injury; Fig. 1g), CK-MB (a
marker of myocardial injury; Fig. 1h) and ET (a marker of endothelial damage; Fig. 1i) in the LPS group were dramatically increased as compared with the control group, indicating organ
damage in LPS-induced DIC model. Importantly, plasma levels of these organ function indicators were greatly reduced in the BMSCs pre-treatment groups compared with the LPS group. The
regulatory effect also relied on the infused dose of BMSCs. To explore the effect of BMSCs pre-treatment on inflammation on DIC, we measured the plasma levels of pro-inflammatory cytokines.
We found that plasma levels of TNF-α (Fig. 1j), IFN-γ (Fig. 1k), and IL-1β (Fig. 1l) in the LPS group were dramatically increased as compared with the control group, indicating inflammation
activation in LPS-induced DIC model. Importantly, plasma levels of these pro-inflammatory cytokines were greatly reduced in the BMSCs pre-treatment groups compared with the LPS group. This
regulatory effect of BMSCs was also presented as dose dependent. BMSCS PRE-TREATMENT AMELIORATES TISSUE DESTRUCTION IN LPS-INDUCED DIC MODEL Given that DIC may result in MOF, we assessed
histological injury in the heart, liver, and kidney from LPS-induced DIC rats by HE and PTAH staining. HEART The control heart tissue exhibited the normal appearance of myocardium and
clearly identifiable small blood vessels. In contrast, the myocardium was dark red in color and showed severe myocardial edema in the LPS group. In the BMSCs pre-treatment groups, the color
and appearance of myocardium were close to that of control heart (Fig. 2a). In addition, as shown in HE and PTAH staining, pre-treatment with BMSCs reduced capillary thrombosis or fibrin
clots in the LPS-induced DIC models (Fig. 2b, c). Histological analysis demonstrated pre-treatment with BMSCs led to a significant reduction of heart injury in the LPS-treated animals (Fig.
2). LIVER The liver in the control group was normal red in color. As expected, the liver treated with LPS was dark red in color accompanied with some hemorrhagic spots. However, the hepatic
color was close to that of control liver after BMSCs pre-treatment (Fig. 3a). Subsequently, HE staining showed the blood was stagnant in hepatic central veins and the hepatocytes were
swollen after LPS treatment (Fig. 3b). Furthermore, extensive fibrin microthrombi formation appeared in hepatic lobules shown in PTAH staining (Fig. 3c). However, the injuries were
ameliorated by BMSCs pre-treatment (Fig. 3). KIDNEY Inspection of the kidney revealed that the renal color was ruddy in the control group. However, the renal color turned to be dark after
LPS treatment. As expected, the renal color was lighter in the BMSCs pre-treatment groups than that in the LPS group (Fig. 4a). HE and PTAH staining of kidneys revealed that BMSCs
pre-treatment alleviated the lesions and capillary thrombosis in the LPS-induced DIC rat model (Fig. 4b, c). Histological analysis revealed that pre-treatment with BMSCs significantly
reduced the LPS-induced renal injury (Fig. 4). Our data confirmed the successful establishment of DIC induced by LPS, as evidenced by positive PTAH staining for intravascular fibrin
formation. Moreover, BMSCs pre-treatment ameliorated organ dysfunction in LPS-induced DIC rats. In addition, the protective effect of BMSCs on the heart, liver, and kidney was moderately
dose dependent. BMSCS PRE-TREATMENT INCREASES SURVIVAL RATES IN LPS-INDUCED DIC MODEL To evaluate the protective effects of BMSCs pre-treatment on LPS-induced DIC rats, we selected another
60 adult male Wistar rats and randomly divided them into six groups. The procedures of pre-treatment with allogeneic BMSCs in rats were the same as mentioned above, except that the
concentration of LPS was increased from 3 mg/kg to 10 mg/kg. We observed the survival times of rats in the six groups within 24 h after LPS injection and analyzed these survival data. Data
for Kaplan–Meier survival analysis revealed that the 24-h survival rates varied with the different treatments among the six groups. The survival rate in the control group was 100%, and a
marked decline of survival rate was observed in the LPS group. However, pre-treatment with BMSCs elevated survival rates in a dose-dependent manner as compared to the LPS group (Fig. 5).
BMSCS INHIBIT LPS-STIMULATED PBMCS PROLIFERATION The proliferative capacity of PBMCs from rats which underwent co-culture with various doses of LPS alone or BMSCs alone was measured by
3H-TdR incorporation assay. The uptake of the thymidine analog BrdU on PBMCs revealed that co-culture with various concentrations of LPS for 72 h significantly stimulated the proliferation
of PBMCs, and the proliferation of 1 μg/ml LPS group reached the highest (Fig. 6a). In contrast with LPS, treatment with allogeneic BMSCs with various doses for 72 h significantly suppressed
the proliferation capacity of PBMCs (Fig. 6b). Next, we explored whether BMSCs had immunosuppressive effects on the proliferation of T lymphocytes in response to LPS stimulation in vitro.
To this end, the isolated PBMCs pre-treated with various doses of BMSCs were co-cultured with LPS (0.5 μg/ml) for 72 h in vitro. Data demonstrated that pre-treatment with BMSCs significantly
inhibited the LPS-stimulated proliferation of PBMCs, and 1 × 104 BMSCs reached the strongest suppression effect (Fig. 6c). BMSCS REDUCE THE LPS-STIMULATED RELEASE OF INFLAMMATORY CYTOKINE
FROM PBMCS Next, the changes of inflammatory cytokines released by lymphocyte in medium also measured. We found that LPS significantly stimulated the release of inflammatory factors from
PBMCs. However, if PBMCs were co-cultured with BMSCs, the LPS-stimulated release of inflammatory cytokines from PBMCs was significantly inhibited. In addition, levels of these cytokines in 1
× 104 BMSCs group were the lowest (Fig. 6d). SOLUBLE MEDIATORS ARE INVOLVED IN BMSCS-MEDIATED INHIBITION OF LPS-STIMULATED PBMCS As shown in Fig. 6e, a significant increase in the protein
expression levels of the soluble mediators, including COX-2, iNOS, IDO, TGF-β1, and IL-10, in BMSCs co-cultured with PBMCs in cell–cell contact condition under LPS stimulation was observed
compared with that in BMSCs alone. To determine whether cell–cell contact between BMSCs and PBMCs was required for the suppression, PBMCs were cultured in the upper chamber of a Transwell
separated by a semipermeable membrane from BMSCs cultured in the lower chamber. A similar result was also found in Transwell culture condition where cell–cell contact between BMSCs and PBMCs
was prevented, indicating that soluble factors were operative (Fig. 6f). We next determined the role of soluble mediators in the BMSCs-mediated suppression of PBMCs proliferation. To this
end, BMSCs were pre-treated with neutralizing antibodies for IL-10 and TGF-β1 that are known to be produced by BMSCs, or chemical antagonists for COX-2 (indomethacin), iNOS (L-NAME), or IDO
(1-MT) for at least 2 h, followed by co-culture with PBMCs in cell–cell contact and Transwell culture conditions under LPS stimulation for 72 h, and then PBMCs numbers were counted. Data
demonstrated that BMSCs-suppressed LPS-stimulated proliferation of PBMCs both in cell–cell contact and Transwell culture conditions, indicating that the BMSCs-mediated suppression of PBMCs
proliferation did not require direct cell-to-cell contact. The finding suggested the possibility that it was mediated through some soluble factors. Meanwhile, pre-treatment with neutralizing
antibody for IL-10 and the specific IDO inhibitor 1-MT significantly reversed the BMSCs-mediated suppression of PBMCs proliferation in the presence of LPS in both cell–cell contact and
Transwell culture conditions. However, treatment with neutralizing antibody for TGF-β1, antagonists for COX-2 and iNOS, failed to reverse the BMSCs-mediated suppression on PBMC
proliferation. These results indicated that IL-10 and IDO, rather than TGF-β1, COX-2, or iNOS, may contribute, at least in part, to BMSCs-mediated inhibition of PBMCs proliferation (Fig. 6g,
h). IFN-Γ-INDUCED UPREGULATION OF IDO AND IL-10 CONTRIBUTES TO BMSCS-MEDIATED INHIBITION OF LPS-STIMULATED PBMCS PROLIFERATION The inflammatory cytokine IFN-γ has been shown to be capable
of regulating the immunomodulatory functions of BMSCs via upregulation of some immunosuppressive factors, including IL-10 and IDO18. Data revealed that IFN-γ treatment significantly
upregulated protein expression levels of IDO protein expression in BMSCs in a dose-dependent manner (Fig. 7a). In addition, functional assays revealed that the concentration of kynurenine, a
metabolic product of IDO, dose-dependently increased in supernatants of BMSCs in response to IFN-γ stimulation (Fig. 7b), indicating that the BMSCs-induced IDO molecule was active.
Furthermore, IFN-γ also stimulated IL-10 secretion by BMSCs in a dose-dependent manner (Fig. 7c). Accordingly, we speculated that the increased IL-10 secretion and IDO expression by BMSCs
may be attributed to an increased IFN-γ production by LPS-stimulated PBMCs. To this purpose, we pre-treated PBMCs with increasing concentrations of IFN-γ-neutralizing antibody followed by
co-culture with BMSCs in the presence or absence of LPS for 24 h. We found that that treatment with IFN-γ-neutralizing antibody significantly inhibited IL-10 secretion (Fig. 7d) and IDO
expression (Fig. 7e) by BMSCs upon co-culture with LPS-stimulated PBMCs. In addition, our results showed that IFN-γ neutralizing antibody led to further inhibition of BMSCs-suppressed
proliferation of PBMCs under LPS stimulation (Fig. 7f). These results indicated that IFN-γ contributed to BMSC-mediated inhibition of PBMCs through the upregulation of IL-10 and IDO
expression. DISCUSSION Pro-inflammatory cytokines such as TNF-α, IFN-γ, and IL-1β play critical roles in the pathologic processes, leading to the microthrombus formation in DIC models32,33.
Accordingly, we speculated that reduced secretion of these pro-inflammatory factors would be beneficial for the prevention and treatment of DIC. As described previously, BMSCs could regulate
these important pro-inflammatory cytokines via a variety of effector mechanisms on immune cells. However, whether BMSCs are helpful in LPS-induced DIC rat models remains unknown. Hence, we
investigated the effectiveness of BMSCs injection in ameliorating LPS-induced DIC. Intravenous infusion of LPS is frequently used to induce DIC in experimental animal models, which
importantly mimic clinical DIC in patients with sepsis34. In this study, we generated a rat model of DIC by LPS injection via the tail vein to investigate the protective effect of BMSCs on
coagulation system and organ function. In this study, the LPS infusion group displayed a significantly lower plasma PLT quantities and Fib levels, significantly higher d-dimer levels,
prolonged times of APTT and PT. Furthermore, HE staining and PTAH staining indicated the formation of microvascular thrombosis and cell injury in the LPS group. Together, these results
indicated that the LPS-induced DIC rat model was established successfully according to the criteria for the diagnosis of DIC. More importantly, we found that BMSCs markedly alleviated
systemic intravascular coagulation, as evidenced by increased PLT counts and Fib concentrations, decreased plasma d-dimer levels, and shortened APTT and PT as compared with the LPS group.
Furthermore, BMSCs pre-treatment exerted protective effects on organ function, as revealed by lower plasma levels of organ function-associated indicators (ALT, Cr, and CK-MB), and reduced
formation of microvascular thrombosis and alleviated organ injury (in heart, liver, and kidney). Moreover, the reduced 24-hour survival rates in the LPS group were increased by BMSCs
pre-treatment. In addition, the BMSCs pre-treatment groups displayed reduced plasma levels of ET that served as a potent vasoconstrictor and an aggravating factor of DIC35,36, which
indicated that BMSCs pre-treatment alleviated the damage of endothelial cells and combat DIC progression. Collectively, these observations supported the notion that BMSCs pre-treatment
ameliorated tissue destruction in LPS-induced DIC rat model. Our results also revealed that more protective effects occurred with more BMSCs pre-treatment, and the best protective effects
were achieved when the number of BMSCs was between 1 × 105 and 1 × 106. In addition, our studies showed that BMSCs pre-treatment significantly reduced the plasma levels of pro-inflammatory
cytokines TNF-α, IFN-γ, and IL-1β. The regulation of cytokines might represent a vital mechanism underlying BMSCs-mediated protection. Furthermore, cytokines and inflammatory mediators
released from lymphocytes play important roles in the progression of DIC. Thus, we speculated that BMSCs might combat DIC by regulation of immunocytes in DIC models. Moreover, the
proliferation and activation of lymphocytes play an important role in the immune response37. Hence, investigation of the altered proliferation of PBMCs is of great significance. In the last
few years, it has become clear that BMSCs also possess immunomodulatory properties. The mechanisms involved in the immunomodulatory activity of BMSCs on T lymphocytes are still partially
obscure. BMSCs play a key role in regulating the maturation and proliferation as well as functional activation of lymphocytes. Nicola et al.11 proposed that allogeneic BMSCs strongly
suppress T-lymphocyte proliferation, which was consistent with our observations. As far as the mechanism underlying BMSC-mediated suppression of T-lymphocyte proliferation is concerned, data
reported so far remains controversial. Is it dependent on direct contact or secretion of cytokines? Which cytokine? How? The mainstream opinion is that the suppressive activity of BMSCs on
PBMCs proliferation does not depend on cell-to-cell contact7,11,18,38, which is in agreement with our findings. As for involved cytokines, a growing body of evidence has indicated that
soluble factors such as TGF-β1, HGF, IL-10, IDO, nitric oxide, human leukocyte antigen-G5 (HLA-G5), and prostaglandin E2 (PGE2), play critical roles in MSC-mediated
immunosuppression11,16,17,18,39. However, the relative contribution of these soluble factors to the immunosuppressive effects of MSCs varies and remains controversial under different
experimental conditions. For instance, a previous study indicated that the inhibition of T-lymphocyte proliferation was not due to induction of apoptosis and was likely due to the production
of soluble factors TGF-β1 and HGF11. But in other studies40, TGF-β1 and IL-10 by BMSCs appeared not to account for the BMSCs-mediated suppression of PBMCs proliferation. Moreover,
controversies about the role of HGF and PGE2 in MSC-mediated immunosuppression have also been reported18,39,41. In our study, we found that the suppressive activity of BMSCs on PBMCs
proliferation was abrogated by blocking IL-10 and IDO but not TGF-β1, iNOS, or COX-2, both under both cell–cell contact and Transwell conditions with LPS stimulation. These results indicate
that IL-10 and IDO might contribute to BMSCs-mediated immunosuppression of PBMCs proliferation. Increasing studies have shown that IFN-γ serves as critical feedback signal molecules in the
cross-talk between immune cells and MSCs cells18. Upon activation, immune cells secrete a high amount of inflammatory cytokines, especially IFN-γ, which may subsequently stimulate MSCs to
express various immunosuppressive molecules, such as IDO, resulting in a negative feedback inhibition of inflammatory cell responses in terms of proliferation and cytokine secretion7,17. In
addition, the crucial role of IFN-γ in BMSCs-driven suppression was further supported by several studies. For example, Krampera et al.7 indicated that the suppressive activity of BMSCs on T
lymphocytes proliferation required the presence of IFN-γ produced by activated T cells and NK cells. And even activated B cells that were unable to produce IFN-γ became susceptible to the
suppressive activity of BMSCs in the presence of exogenously added IFN-γ. In our study, we demonstrated that IFN-γ stimulation significantly increased the level of functional IDO and
enhanced IL-10 secretion by BMSCs. Furthermore, in response to LPS stimulation, BMSCs exhibited enhanced secretion of IFN-γ and IL-10 as well as IDO expression. Moreover, co-culture with
BMSCs resulted in suppression of LPS-stimulated proliferation of PBMCs and secretion of IFN-γ and IL-10 as well as IDO expression. More importantly, blocking IFN-γ led to a significant and
dose-dependent reduction of IL-10 secretion and IDO expression, as well as an abrogation of BMSCs-mediated inhibition of PBMCs proliferation. Taken together, these findings indicate that
IFN-γ promotes the immunomodulatory activity of BMSCs, which in turn suppress PBMCs proliferation. The ability of IFN-γ to induce the immunosuppressive effect of BMSCs on PBMCs proliferation
appeared to be, at least in part, related to the enhancement of the IDO activity and secretion of IL-10. Many studies investigated the therapeutic effects of BMSCs in injury-models induced
by LPS. For example, Yagi et al.42,43 demonstrated that intramuscular transplantation of BMSCs immediately after the LPS induction decreased inflammatory cytokines and attenuated multiple
organ injury in LPS-induced endotoxemic rats. Zhang et al.44 showed that BMSCs transplantation attenuated d-galactosamine/LPS-induced acute liver failure in a rat model. Zhao et al.45 have
also suggested that intravenous transplantation of BMSCs into the injured rats shortly following LPS challenge alleviated local inflammation and severity of acute lung injury. Our findings
from this current study revealed that BMSCs pre-treatment ameliorated inflammation-related tissue destruction in LPS-induced DIC rat model. However, the protective effects of transplanted
BMSCs were unclear. It is worth noting that a previous study has confirmed that administering BMSCs to mice either before or shortly after inducing sepsis reduced mortality and improved
organ function22. This study provided supporting evidence for the protective effects of transplanted BMSCs in DIC, which requires our further investigation. CONCLUSION In conclusion, the
data presented in this paper demonstrated that BMSCs pre-treatment effectively inhibited intravascular coagulation, ameliorated inflammation-related tissue destruction, and improved the
24-hour survival rates of LPS-induced DIC model rats. The protection of BMSCs could be due to their capabilities to suppress production of inflammatory mediators and to regulate immune
tolerance, which render BMSCs a promising source for stem cell-based therapeutic approaches in inflammation-related DIC. REFERENCES * Yahata, M. & Sakamoto, Y. Anti DIC therapy. _Nihon
Rinsho_ 74, 257–261 (2016). PubMed Google Scholar * Levi, M. & Sivapalaratnam, S. Disseminated intravascular coagulation: an update on pathogenesis and diagnosis. _Expert Rev.
Hematol._ 11, 663–672 (2018). Article CAS Google Scholar * Levi, M. and M. Scully. How I treat disseminated intravascular coagulation. _Blood_ 131,845-854 (2018). Article Google Scholar
* Levi, M. Disseminated intravascular coagulation. _Crit. Care Med._ 35, 2191–2195 (2007). Article CAS Google Scholar * Toh, C. H. & Alhamdi, Y. Current consideration and management
of disseminated intravascular coagulation. _Hematol. Am. Soc. Hematol. Educ. Program._ 2013, 286–291 (2013). Google Scholar * Wada, H., Hasegawa, K. & Watanabe, M. DIC: an update on
diagnosis and treatment. _Rinsho Ketsueki_ 58, 523–529 (2017). PubMed Google Scholar * Krampera, M. et al. Role for interferon-gamma in the immunomodulatory activity of human bone marrow
mesenchymal stem cells. _Stem Cells_ 24, 386–398 (2006). Article CAS Google Scholar * Sugino, N. et al. Pharmacological targeting of bone marrow mesenchymal stromal/stem cells for the
treatment of hematological disorders. _Inflamm. Regen._ 37, 7 (2017). Article Google Scholar * Liao, L. et al. Heparin improves BMSC cell therapy: anticoagulant treatment by heparin
improves the safety and therapeutic effect of bone marrow-derived mesenchymal stem cell cytotherapy. _Theranostics_ 7, 106–116 (2017). Article CAS Google Scholar * Abdallah, B. M. &
Kassem, M. The use of mesenchymal (skeletal) stem cells for treatment of degenerative diseases: current status and future perspectives. _J. Cell Physiol._ 218, 9–12 (2009). Article CAS
Google Scholar * Di Nicola, M. et al. Human bone marrow stromal cells suppress T-lymphocyte proliferation induced by cellular or nonspecific mitogenic stimuli. _Blood_ 99, 3838–3843 (2002).
Article Google Scholar * Abumaree, M. H. et al. Immunomodulatory properties of human placental mesenchymal stem/stromal cells. _Placenta_ 59, 87–95 (2017). Article CAS Google Scholar *
Dabrowski, F. A. et al. Mesenchymal stem cells from human amniotic membrane and umbilical cord can diminish immunological response in an in vitro allograft model. _Gynecol. Obstet. Invest._
82, 267–275 (2017). Article CAS Google Scholar * Tyndall, A. & Pistoia, V. Mesenchymal stem cells combat sepsis. _Nat. Med._ 15, 18–20 (2009). Article CAS Google Scholar * Nauta,
A. J. & Fibbe, W. E. Immunomodulatory properties of mesenchymal stromal cells. _Blood_ 110, 3499–3506 (2007). Article CAS Google Scholar * Selmani, Z. et al. Human leukocyte
antigen-G5 secretion by human mesenchymal stem cells is required to suppress T lymphocyte and natural killer function and to induce CD4 + CD25highFOXP3 + regulatory T cells. _Stem Cells_ 26,
212–222 (2008). Article CAS Google Scholar * Aggarwal, S. & Pittenger, M. F. Human mesenchymal stem cells modulate allogeneic immune cell responses. _Blood_ 105, 1815–1822 (2005).
Article CAS Google Scholar * Zhang, Q. et al. Mesenchymal stem cells derived from human gingiva are capable of immunomodulatory functions and ameliorate inflammation-related tissue
destruction in experimental colitis. _J. Immunol._ 183, 7787–7798 (2009). Article CAS Google Scholar * Munn, D. H. et al. Potential regulatory function of human dendritic cells expressing
indoleamine 2,3-dioxygenase. _Science_ 297, 1867–1870 (2002). Article CAS Google Scholar * Wong, J. L. et al. Synergistic COX-2 induction by IFNgamma and TNFalpha self-limits type-1
immunity in the human tumor microenvironment. _Cancer Immunol. Res._ 4, 303–311 (2016). Article CAS Google Scholar * Liu, Y. et al. Periodontal ligament stem cell-mediated treatment for
periodontitis in miniature swine. _Stem Cells_ 26, 1065–1073 (2008). Article Google Scholar * Nemeth, K. et al. Bone marrow stromal cells attenuate sepsis via prostaglandin E(2)-dependent
reprogramming of host macrophages to increase their interleukin-10 production. _Nat. Med._ 15, 42–49 (2009). Article CAS Google Scholar * Wang, B. et al. Pre-treatment with bone
marrow-derived mesenchymal stem cells inhibits systemic intravascular coagulation and attenuates organ dysfunction in lipopolysaccharide-induced disseminated intravascular coagulation rat
model. _Chin. Med. J. (Engl.)._ 125, 1753–1759 (2012). CAS PubMed Google Scholar * Zhang, H. et al. Apelin inhibits the proliferation and migration of rat PASMCs via the activation of
PI3K/Akt/mTOR signal and the inhibition of autophagy under hypoxia. _J. Cell Mol. Med._ 18, 542–553 (2014). Article CAS Google Scholar * Dominici, M. et al. Minimal criteria for defining
multipotent mesenchymal stromal cells. The International Society for Cellular Therapy position statement. _Cytotherapy_ 8, 315–317 (2006). Article CAS Google Scholar * Wang, B. et al.
Bone marrow-derived mesenchymal stem cells-mediated protection against organ dysfunction in disseminated intravascular coagulation is associated with peripheral immune responses. _J. Cell
Biochem._ 118, 3184–3192 (2017). Article CAS Google Scholar * Kessler, C. M. et al. The suprapharmacologic dosing of antithrombin concentrate for Staphylococcus aureus-induced
disseminated intravascular coagulation in guinea pigs: substantial reduction in mortality and morbidity. _Blood_ 89, 4393–4401 (1997). CAS PubMed Google Scholar * Billingham, M. E. et al.
A working formulation for the standardization of nomenclature in the diagnosis of heart and lung rejection: Heart Rejection Study Group. The International Society for HeartTransplantation.
_J. Heart Transplant._ 9, 587–593 (1990). CAS PubMed Google Scholar * Suzuki, S. et al. Neutrophil infiltration as an important factor in liver ischemia and reperfusion injury. Modulating
effects of FK506 and cyclosporine. _Transplantation_ 55, 1265–1272 (1993). Article CAS Google Scholar * Todorovic, Z. et al. Acute protective effects of simvastatin in the rat model of
renal ischemia-reperfusion injury: it is never too late for the pretreatment. _J. Pharmacol. Sci._ 107, 465–470 (2008). Article CAS Google Scholar * Eminel, S. et al. Dimethyl- and
monomethylfumarate regulate indoleamine 2,3-dioxygenase (IDO) activity in human immune cells. _Exp. Dermatol._ 26, 685–690 (2017). Article CAS Google Scholar * Okajima, K. The role of
leukocytes in disseminated intravascular coagulation associated with sepsis. _Sepsis_ 3, 135–142 (1999). Article Google Scholar * Ozmen, L. et al. Interleukin 12, interferon gamma, and
tumor necrosis factor alpha are the key cytokines of the generalized Shwartzman reaction. _J. Exp. Med._ 180, 907–915 (1994). Article CAS Google Scholar * Asakura, H. et al.
Pathophysiology of disseminated intravascular coagulation (DIC) progresses at a different rate in tissue factor-induced and lipopolysaccharide-induced DIC models in rats. _Blood. Coagul.
Fibrinolysis_ 14, 221–228 (2003). CAS PubMed Google Scholar * Asakura, H. et al. Selective inducible nitric oxide synthase inhibition attenuates organ dysfunction and elevated endothelin
levels in LPS-induced DIC model rats. _J. Thromb. Haemost._ 3, 1050–1055 (2005). Article CAS Google Scholar * Ishibashi, M. et al. Endothelin-1 as an aggravating factor of disseminated
intravascular coagulation associated with malignant neoplasms. _Cancer_ 73, 191 (1994). Article CAS Google Scholar * Flaminio, M. J. & Antczak, D. F. Inhibition of lymphocyte
proliferation and activation: a mechanism used by equine invasive trophoblast to escape the maternal immune response. _Placenta_ 26, 148 (2005). Article CAS Google Scholar * Rasmusson, I.
et al. Mesenchymal stem cells inhibit lymphocyte proliferation by mitogens and alloantigens by different mechanisms. _Exp. Cell Res._ 305, 33–41 (2005). Article CAS Google Scholar * Cui,
L. et al. Expanded adipose-derived stem cells suppress mixed lymphocyte reaction by secretion of prostaglandin E2. _Tissue Eng._ 13, 1185–1195 (2007). Article CAS Google Scholar * Tse,
W. T. et al. Suppression of allogeneic T-cell proliferation by human marrow stromal cells: implications in transplantation. _Transplantation_ 75, 389–397 (2003). Article CAS Google Scholar
* Spaggiari, G. M. et al. Mesenchymal stem cells inhibit natural killer-cell proliferation, cytotoxicity, and cytokine production: role of indoleamine 2,3-dioxygenase and prostaglandin E2.
_Blood_ 111, 1327–1333 (2008). Article CAS Google Scholar * Yagi, H. et al. Bone marrow mesenchymal stromal cells attenuate organ injury induced by LPS and burn. _Cell Transplant._ 19,
823–830 (2010). Article Google Scholar * Yagi, H. et al. Reactive bone marrow stromal cells attenuate systemic inflammation via sTNFR1. _Mol. Ther._ 18, 1857–1864 (2010). Article CAS
Google Scholar * Zhang, Z. H. et al. Mesenchymal stem cells increase expression of heme oxygenase-1 leading to anti-inflammatory activity in treatment of acute liver failure. _Stem Cell
Res. Ther._ 8, 70 (2017). Article Google Scholar * Zhao, Y. et al. Therapeutic effects of bone marrow-derived mesenchymal stem cells on pulmonary impact injury complicated with endotoxemia
in rats. _Int. Immunopharmacol._ 15, 246–253 (2013). Article CAS Google Scholar Download references AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Department of Cardiovascular Surgery,
Qilu Hospital of Shandong University, Wenhua West Road, Jinan, Shandong, China Biao Wang, Shuming Wu, Zengshan Ma, Tao Wang & Changyong Yang Authors * Biao Wang View author publications
You can also search for this author inPubMed Google Scholar * Shuming Wu View author publications You can also search for this author inPubMed Google Scholar * Zengshan Ma View author
publications You can also search for this author inPubMed Google Scholar * Tao Wang View author publications You can also search for this author inPubMed Google Scholar * Changyong Yang View
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ameliorates inflammation-related tissue destruction in LPS-induced rat DIC model. _Cell Death Dis_ 9, 1024 (2018). https://doi.org/10.1038/s41419-018-1060-5 Download citation * Received: 22
March 2018 * Revised: 06 August 2018 * Accepted: 20 August 2018 * Published: 03 October 2018 * DOI: https://doi.org/10.1038/s41419-018-1060-5 SHARE THIS ARTICLE Anyone you share the
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