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BACKGROUND:Autologous stem celltransplantation to the heart is a research direction of heart failure treatment, but there are relatively few of studies about autologous bone marrow mesenchymal stem celltransplantation targeting the cardiac conduction system. OBJECTIVE:To evaluate the potential of rabbit bone marrow mesenchymal stem cells for treatment of heart block. METHODS:Rabbit bone marrow mesenchymal stem cells were induced by 5-azacytidine to differentiate into cardiomyocyte-like cells. After thoracotomy, the left atrium-left ventricular anterior wal was sutured in 14 New Zealand white rabbits (8 in the experimental group and 6 in the control group). One month after the surgery, in the experimental group, autologous bone marrow mesenchymal stem cells induced by 5-azacytidine for 4 weeks were labeled with 4',6-diamidino-2-phenylindole and then injected into the suture area when opening the thoracic again. In the control group, cells cultured in medium were used. One month after celltransplantation, the third thoracotomy was done to insert electrodes into the left atrium and left ventricular anterior wal , for cardiac electrophysiological detection. Whether atrioventricular pathway formed in the suture area was observed. RESULTS AND CONCLUSION:After cells were transplanted into the sutured area, two rabbits in the experimental group were discovered to form the atrioventricular pathway in the sutured area through cardiac electrophysiological examination. After transplantation, transplanted cells were visible on the heart frozen sections under fluorescence microscope in the left ventricle and sutured area, but there was no cellin the control group. In the experimental group, bone marrow mesenchymal stem cells expressed Cx43 and formed gap junction intercellular communication with cardiomyocytes, which was presented as formation of the atrioventricular pathway on cardiac electrophysiology examination. These findings indicate that bone marrow mesenchymal stem cells can be used to treat cardiac conduction system block diseases.
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BACKGROUND:So far, the short-term changes of various organs after injection of umbilical cord mesenchymal stem cells have been reported, but there are few studies on the long-term changes of various organs in healthy rats after repeated intramuscular injection of umbilical cord mesenchymal stem cells. OBJECTIVE:To observe the security of intramuscular injection of heterogeneous umbilical cord mesenchymal stem cells. METHODS:Sixty male SPF Wistar rats were divided into six groups randomly:normal group (suspension liquid of umbilical cord mesenchymal stem cells);control group with culture solution;supernatant group (supernatant of human umbilical cord mesenchymal stem cells);low concentration group (0.25×105 human umbilical cord mesenchymal stem cells);moderate concentration group (1.0×105 human umbilical cord mesenchymal stem cells);high concentration group (4.0×105 human umbilical cord mesenchymal stem cells). Each rat was injected 0.8 mL liquid in muscle, 0.2 mL in each limb, twice at weeks 1 and 4. Biochemical tests were conducted before and after injection. At the end of 8 weeks, al the rats were kil ed and hematoxylin-eosin staining was done with the liver, spleen, lung, kidney, brain and muscle. RESULTS AND CONCLUSION:There was no abnormal change about biochemical tests and hematoxylin-eosin staining after the intramuscular injection of heterogeneous umbilical cord mesenchymal stem cells. No significant alteration was observed in the liver, spleen, lung, kidney, brain, and muscle of the limb after the injection of heterogeneous umbilical cord mesenchymal stem cells under suitable concentration. These findings indicate intramuscular injection of heterogeneous umbilical cord mesenchymal stem cells at certain concentrations is safe and reliable.
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BACKGROUND:Spinocerebel ar ataxia is a inherited neurodegenerative disease with progressive cerebel ar masonic movement disorders as the main clinical manifestation. So far, no drug is available to control the disease progression. OBJECTIVE:To observe the clinical effect of umbilical cord mesenchymal stem cells in treating spinocerebel ar ataxia by intrathecal injection. METHODS:Thirty-eight cases of spinocerebel ar ataxia were given umbilical cord mesenchymal stem cells by intrathecal injection, 1×106/kg once a week, four times as a course. These 38 cases received 52 courses. Among them, 27 cases received 1 course, 8 cases received 2 courses and 3 cases received 3 courses. International Cooperative Ataxia Rating Scale (ICARS) and Activity of Daily Living Scale (ADL) were used to evaluate patients’ neural functions (the greater scores, the more severe damage) and ability of daily living (the lower score, the stronger the ability of daily living). After treatment, al patients were subjected to fol ow-up visit. RESULTS AND CONCLUSION:The total effective rate of 52 courses of treatment was 84.62%. ICARS and ADL scores were significantly decreased at 1 month after treatment (P<0.01). In most of effective patients, unstable walking and standing, slow movement, upper limb fine motor disorder, writing difficulties, dysarthria, eye movement disorders were improved. After treatment, common adverse effects were dizziness (1 case), low back pain (2 cases), headache (1 case), and fever (2 cases). Al these symptoms disappeared within 1-3 days. No treatment-related adverse events happened in the median fol ow-up of 39 months (11-59 months). The il ness of effective patients had been stable for 1-19 months, average (5.95±4.84) months. Intrathecal injection of umbilical cord mesenchymal stem cells is safe to ameliorate clinical symptoms to some extent within a certain time. It may delay the progression of spinocerebel ar ataxia. Multiple courses of treatment can help to further improve neurological function in most patients.
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BACKGROUND:The preliminary findings confirm that bone marrow mesenchymal stem celltransplantation is safe and effective in the treatment of acute myocardial infarction, but its exact mechanism is unclear. There are few studies addressing the survival status of transplanted stem cells and its acting timing. OBJECTIVE:To study the survival of rat bone marrow mesenchymal stem cells transplanted into the infracted myocardium. METHODS:Bone marrow mesenchymal stem cells were cultured using density gradient centrifugation. Eighty rat models of myocardial infarction were prepared. Bone marrow mesenchymal stem cells were injected via a microsyringe at four sites around the infarcted region at 14 days after modeling. Then, 70 rats with living cells were selected for detecting the survival of bone marrow mesenchymal stem cells at days 3, 5, 7, 10, 20, 28 after transplantation. RESULTS AND CONCLUSION:Under ×400 visual field, the number of Brdu-positive bone marrow mesenchymal stem cells was (36±12) at 3 days posttranplantation, (33±13) at 5 days, (28±9) at 7 days, (15±5) at 10 days, (5±3) at 14 days, 0 at 20 days, and 0 at 28 days, showing a overal downward trend after transplantation. The number of bone marrow mesenchymal stem cells was negatively correlated with transplant days (P<0.01, r=-0.47). The number of cells decreased most significantly within 1 week after transplantation, and then decreased to 0 at 20 days. These findings indicate that transplanted bone marrow mesenchymal stem cells in the myocardium cannot survive for a long term and also cannot be transformed into myocardial tissue.
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BACKGROUND:In vitro studies have demonstrated that basic fibroblast growth factor (bFGF) promote the differentiation of bone marrow mesenchymal stem cells (BMSCs) into cardiomyocyte-like cells. However, it is unclear whether coronary venous retroperfusion of bFGF stimulates BMSCs differentiation in vivo. OBJECTIVE:To evaluate the effects of coronary venous retroperfusion of bFGF on BMSCs differentiation in vivo. METHODS:BMSCs from 12 dogs were isolated by density gradient centrifugation and expanded in vitro. These cells were transfected by enhanced green fluorescence protein (EGFP) lentiviral vector and the transfection efficiency was analyzed. Acute myocardial infarction was induced by ligation of left anterior descending coronary artery. After 1 week, 10 survival animals were randomized to BMSCs group (n=5) and bFGF+BMSCs group (n=5). bFGF-and EGFP-positive BMSCs were reversely infused via coronary vein using over-the-wire bal oon catheter. One week after infusion, the number of EGFP-positive cells co-staining factor VIII and troponin I was compared between the two groups by immunofluorescence method. RESULTS AND CONCLUSION:BMSCs were successful y transfected by EGFP and the transfection efficiency was 85%. Immunofluorescence showed that EGFP-positive BMSCs were observed in 23.5%of slides. There were more EGFP-positive cells co-staining VIII and troponin I in the bFGF+BMSCs group than in the BMSCs group (P<0.05). Thus, the coronary venous retroperfusion of bFGF enhances the differentiation of BMSCs into vascular endothelial cells and cardiomyocytes. Combined delivery of bFGF and BMSCs can exert a synergistic effect to promote cardiac repair.
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BACKGROUND:Bone marrow mesenchymal stem cells (BMSCs) can be induced to differentiate into neuron-like cells directional y. Accordingly, BMSCs can be used as seed cells theoretical y in constructing tissue-engineered peripheral nerves. OBJECTIVE:Using combination of two cytokines to induce BMSCs differentiating into neuron-like cells directional y, and further to discusse its application in peripheral nerve injury. METHODS:BMSCs were isolated and purificated from the bone marrow of Wistar rats by using the differential adherence method. Basic fibroblast growth factor and epidermal growth factor were used to induce the BMSCs differentiating into neuron-like cells. The morphological change was observed and the neuronal specific markers were detected by immunohistochemistry technique. The morphological and immunohistological changes were also studied after the induce agent were removed. RESULTS AND CONCLUSION:With presence of morphological and immunohistochemical features of nerve cells induced by neurotrophic factors, BMSCs exhibited two or more processes that were interconnected as a meshwork;cellnucleus and nucleus could be observed with strong light refraction of cytoplasm. After immunohistochemical staining, neuroln specific enolase, neurofilament protein and synaptophysin protein positive cells were detected. A great amount of cells reversed to their original fibroblast-like morphology, and the expression of the three above-mentioned proteins decreased as the induce agent withdrawn. Our study showed that BMSCs can be induced to differentiate into neuron-like cells, but the transdifferentiation is a short-time reversible phenomenon.
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BACKGROUND:Bone marrow mesenchymal stem cell(BMSC) transplantation is one of the developmental directions in the treatment of femoral head necrosis. In recent years, the use of superparamagnetic iron oxide (SPIO) nanoparticles labeled target cells traced by MRI imaging method has become the focus of the study. OBJECTIVE:To observe the in vivo MRI tracking and the curative effects of SPIO-labeled BMSC transplantation on rabbit femoral head necrosis. METHODS:SPIO-labeled BMSCs, unlabeled BMSCs, and normal saline were injected in situ into the necrotic femoral head of rabbits. Fol owing MRI dectection, the image changes of transplanted BMSCs marked by SPIO were observed among the three scanning sequences of SE T2WI, FSE T2WI and GRE T2*WI. Meanwhile, the area percentage of newly formed bone trabecula in the defect samples under high power lens were observed and calculated for statistical analysis. RESULTS AND CONCLUSION:In situ celltransplantation group showed the emerging and extinctive time of the decreased-signal region was different among the three scanning sequences of SE T2WI, FSE T2WI and GRE T2*WI. It was found that the decreased-signal region of the MRI scanning sequences was the target of the present experiment. No obvious signal change occurred in the control side. After 6 weeks of transplantation, the area percentage of newly formed bone trabecula in the defect samples showed no difference in SPIO-labeled and unlabeled BMSC transplantation groups (P>0.05), but it was higher than that in the control side (P<0.01). The SPIO-labeled BMSCs and unlabeled BMSCs are shown to have the same effects in the treatment of femoral head necrosis. The SPIO-labeled BMSCs can be observed obviously by MRI detection in vitro.
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BACKGROUND:In recent years, studies have shown that mesenchymal stem cells can secrete various growth factors, and has certain application prospect in the treatment of liver fibrosis. OBJECTIVE:To explore the different sources of mesenchymal stem cells in the treatment of liver fibrosis in rats. METHODS:Fifty Sprague-Dawley rats were given intraperitoneal injection of carbon tetrachloride to construct the model of liver fibrosis. Another 10 normal Sprague-Dawley rats were used as normal controls. Model rats were randomly divided into five groups, 10 rats in each group, including model control group, normal saline group, bone marrow mesenchymal stem cellgroup, umbilical cord mesenchymal stem cellgroup, and umbilical cord blood mesenchymal stem cellgroup. After 8 weeks of modeling, different sources of mesenchymal stem cells at a density of 2×106 were injected via tail vein into model rats. After 12 weeks, the rats were kil ed, and serum alanine aminotransferase, aspartate aminotransferase and albumin levels were detected as wel as the expression of type I col agen and glial fibril ary acidic protein in liver tissue was detected by fluorescence quantitative PCR method. RESULTS AND CONCLUSION:We have successful y established the SD rat model of hepatic fibrosis. Bone marrow mesenchymal stem cells aggravated hepatic fibrosis, umbilical cord blood and umbilical cord mesenchymal stem cells could reduce the level of hepatic fibrosis in rats. Umbilical cord mesenchymal stem cells had the most obvious effect that significantly reduced expressions of alanine aminotransferase, aspartate aminotransferase and type I col agen and glial fibril ary acidic protein. The results showed different sources of mesenchymal stem cells have different effects on rat fibrosis. Bone marrow mesenchymal stem cells aggravate hepatic fibrosis, and umbilical cord and umbilical cord blood stem cells can al eviate hepatic fibrosis in rats.
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BACKGROUND:Epimedium has been used in the treatment of osteoporosis and repair of bone defects. OBJECTIVE:To explore the effects of epimedium on the osteogenic differentiation of bone marrow mesenchymal stem cells. METHODS:A database search was performed to retrieve literatures addressing epimedium effects on the osteogenic differentiation of bone marrow mesenchymal stem cells. Then, the papers meeting the criteria were selected for in-depth analysis. During the osteogenic differentiation induced by epimedium, alkaline phosphatase, osteocalcin, osteopontin, transforming growth factorβ, bone morphogenetic proteins, osteocalcin, bone sialoprotein were detected in the bone marrow mesenchymal stem cells to understand the underlying mechanism of epimedium in proliferation and osteogenic differentiation of bone marrow mesenchymal stem cells. RESULTS AND CONCLUSION:Epimedium effects on bone marrow mesenchymal stem cells are shown in a dose-dependent manner. During the early induction, icari n can increase cellphosphatase activity;in the late induction, icari n can increase calcified nodules, promote osteocalcin secretion, significantly improve the expressions of transforming growth factorβ1, bone morphogenetic protein 2, insulin-like growth factor-1, osteopontin and bone sialoprotein. Epimedium, which can be used as an excellent osteoinductive factor, improves the proliferation and osteogenic differentiation of bone marrow mesenchymal stem cells.
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BACKGROUND:In recent years a large number of studies have suggested that bone marrow mesenchymal stem cells can ease hyperglycemia of diabetic rats, but the related mechanism is unclear and controversial. OBJECTIVE:To investigate the relevant mechanism of bone marrow mesenchymal stem cells on pancreas microenvironment in vivo in diabetic rats. METHODS:Bone marrow mesenchymal stem cells were transfected with enhanced green fluorescent protein (EGFP) and administered to diabetic rats via the subcapsular pancreas. Blood glucose levels were monitored. The expressions of the key genes in islet development in these EGFP positive pancreatic cells were analyzed by Real-time quantitative PCR at different times. EGFP and insulin double-positive cells were detected by immunofluorescence. Flow cytometry was performed to analyze cellcycle and DNA ploidy. RESULTS AND CONCLUSION:Blood glucose levels were effectively reduced after transplantation. The expressions of the key genes in islet development reached their own peak values at different times after transplantation:Nestin at week 1, Nkx 2.2 at week 3, Pax 4 and Ngn 3 at week 4, insulin and glucagon at week 12, PDX-1 at week 8 until week 12. The cells double-positive for EGFP and insulin cells were observed. In the pancreas, EGFP positive cells at S+G 2/M phase were significantly increased, and there were no polyploid and aneuploid cells. In pancreas microenvironment, the bone marrow mesenchymal stem cells transplanted into the diabetic pancreas can differentiate into isletβ-like cells under gene control, but not through the fusion with tissue cells.
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BACKGROUND:Studies have shown that exogenous bone marrow mesenchymal stem cells can settle down in lung tissue, participate in long regeneration, but few studies concerned the repair of aging lung injury. OBJECTIVE:To observe the effect of bone marrow mesenchymal stem cells on lung injury induced by D-galactose. METHODS:A total of 30 Sprague-Dawley rats were equal y divided into three groups at random:control group, aging model group and celltreatment group. To establish the aging rats, 10 rats each in the aging model group and celltreatment group were daily subcutaneously injected with D-galactose for 4 months. 3×106 bone marrow mesenchymal stem cells were transplanted via caudal vein in the celltreatment group, once a week, for 4 weeks. cellmedium of equal dose was added in the control and aging model groups. Bone marrow mesenchymal stem cells were transfected by lentiviral vectors expressing green fluorescent protein to determine the implantation of bone marrow mesenchymal stem cells in rat lung. Superoxide dismutase activity and malondialdehyde content in rat lung were measured in each group. The difference in rat lung structure was observed using hematoxylin-eosin staining in each group. RESULTS AND CONCLUSION:Bone marrow mesenchymal stem cells marked by green fluorescent protein were implanted in rats, migrated towards lung tissue and survived. Compared with aging model group, superoxide dismutase activity was apparently increased, but malondialdehyde content was obviously diminished in the celltreatment group. In each group, histopathological sections revealed that normal pulmonary alveolus was damaged in the aging model group, showing enlarged air cavity and emphysema. Lung injury was evidently repaired inthe celltreatment group. Results suggested that bone marrow mesenchymal stem cells could repair lung injury in aging rats, and exert anti-aging effects.
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BACKGROUND:Previous studies have verified that mesenchymal stem cells could be transplanted into inflammatory bowel mucosa to repair inflammatory bowel tissue. OBJECTIVE:To observe the differential gene expression in large intestine before and after mesenchymal stem celltransplantation in repair of inflammatory bowel tissue of rats using microarray technology, and to primarily discover the main genes during mesenchymal stem celltransplantation, differentiation, and reparation in inflammatory colorectal tissue region. METHODS:Healthy Sprague-Dawley rats were randomly divided into two groups. Experimental rat models of inflammatory bowel disease were established using trinitrobenzene sulfonic acid via enema. At 24 hours after model establishment, green fluorescent protein-labeled mesenchymal stem cells were infused via the caudal vein. The control group was treated with physiological saline by enema, instead of trinitrobenzene sulfonic acid. At 28 days, large intestine was obtained from the experimental group and control group. Differential y expressed genes were screened in the experimental and control groups using microarray technique. RESULTS AND CONCLUSION:The microarray analysis results showed that there were 388 differential genes in the control and experimental groups (P2), in which 191 were up-expressed, and 197 were down-expressed. Al of these genes were mainly involved in inflammatory reaction, immune reaction and celldifferentiation. In the top 10 up-regulation and down-regulation differential genes (total y 20 genes), 3 genes were involved in inflammation, 3 genes were involved in immune reaction, and 2 genes were related to stem celldifferentiation. In the 388 genes, 33 were related to signaling pathways (P<0.05), 6 related to inflammation, 8 related to immunity, and 5 related to stem celldifferentiation. Results suggested that the main genes involved in mesenchymal stem cells in repair of inflammatory bowel tissue were primarily screened using gene expression microarray technique.
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BACKGROUND:Compared with bone marrow and autologous peripheral blood stem cells, umbilical cord mesenchymal stem cells are characterized as more primitive, more powerful amplification and lower immunogenicity, no ethical problems, which are more important to the elderly patients with diabetes mel itus. OBJECTIVE:To evaluate the efficacy and safety of umbilical cord mesenchymal stem cells transplantation in the treatment of the elderly patients with diabetic lower limb vascular disease. METHODS:Fifty-six elderly patients with diabetic lower limb vascular disease were randomly divided into observation group and control group. The control group was treated with conventional therapy, while the observation group was treated with umbilical cord mesenchymal stem cells transplantation. RESULTS AND CONCLUSION:Observation group showed a higher efficiency than the control group, with significant difference (P<0.05). After treatment, foot skin temperature, transcutaneous oxygen pressure, and ankle brachial index were al improved in both two groups, and the ankle brachial index showed a better value in the observation group (P<0.05). There were no significant adverse reactions in the two groups. Umbilical cord mesenchymal stem cells transplantation is a simple, safe and effective therapy for the elderly patients with diabetic lower limb vascular disease, with better short-term curative effect.
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BACKGROUND:Transfusion of bone marrow mesenchymal stem cells may become a novel and effective biological therapy for inflammatory bowel disease in clinical practice. Nevertheless, the oncological safety of the treatment is worrisome, and is a key to determine whether mesenchymal stem cells can be widely used in treatment of inflammatory bowel disease, and deserves further investigation. OBJECTIVE:To evaluate the therapeutic effect of bone marrow mesenchymal stem celltransfusion against inflammatory bowel disease in mouse models, and to clarify the effects of mesenchymal stem cells on tumorigenesis of inflammatory bowel disease. METHODS:Mouse model of colitis was established using Balb/c (H-2d) mice exposed to dextran sulfate sodium. Syngeneic bone marrow mesenchymal stem cells were transfused into mouse model through caudal vein. The therapeutic effect of mesenchymal stem cells was compared and observed, and pathological remission of colitis was evaluated. Mouse model of colitis-driven colon carcinogenesis was established using Balb/c (H-2d) mice exposed to dextran sulfate sodium and azoxymethane. Tumor formation within the murine colon was compared and observed after transfusion of mesenchymal stem cells. RESULTS AND CONCLUSION:In models of dextran sulfate sodium-induced colitis, weight loss and fecal occult blood were lessened in the bone marrow mesenchymal stem cellgroup compared with the phosphate buffered saline group. Histological damage score of colitis was less in the bone marrow mesenchymal stem cellgroup:mucosal structure of distal colon was almost intact under microscope, and there was smal area of epithelial defects and cryptal defects. Inflammatory cellinfiltration, proliferation of capil ary and smal vessels could be observed in mucosa and submucosa. Homing and colonization of mesenchymal stem cells in submucosa of inflamed colon could also be observed by in vivo tracing. In the dextran sulfate sodium/azoxymethane model of colitis-driven colon carcinogenesis, the number of intestinal tumors and tumor load were obviously less in the bone marrow mesenchymal stem cellgroup than in the control group. Results indicated that transfusion of bone marrow mesenchymal stem cells can apparently improve colitis lesions of mice with inflammatory bowel disease and inhibit carcinogenesis of colitis, which may provide theoretical support for the biological safety of mesenchymal stem cells transplantation for inflammatory bowel disease.
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BACKGROUND:Adult cardiomyocytes show no regenerative ability, and celltherapy for myocardial regeneration and repair may improve myocardial ischemic injury function. OBJECTIVE:To confirm the effect and reveal the mechanism of bone marrow mesenchymal stem cells (BMSCs) on acute myocardial infarction (AMI). METHODS:BMSCs were isolated, cultured from bone marrow of Sprague-Dawley rats using density gradient centrifugation. AMI models were produced in 20 rats by ligating the left anterior descending (LAD) coronary artery, and randomly divided into model group and BMSCs group. In the BMSCs group, cells were subsequently injected with a sterile microinjection via the tail vein. RESULTS AND CONCLUSION:Six months postoperatively, the cardiac function was improved, the vessel density was increased, the percentage of apoptotic cells was decreased in the BMSCs group than that in the model group;the expression levels of inflammatory factors, including vascular endothelial growth factor, von Wil ebrand factor, transforming growth factor 3β, and interleukin-1βmRNA were significantly improved in the BMSCs group than that in the model group. These results showed that BMSCs can protect the myocardium from AMI by regulating the secretion of inflammatory cytokines and angiogenic factors.
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BACKGROUND:The main therapy of severe aplastic anemia in children is immunosuppressive therapy or stem celltransplantation, but the latter one is restricted due to few donor sources. Haploidentical hematopoietic stem celltransplantation is commonly used in leukemia, but it is stil rarely reported in the treatment of aplastic anemia. OBJECTIVE:To investigate the effect of haploidentical hematopoietic stem celltransplantation combined with placenta-derived mesenchymal stem celltransplantation for children with severe aplastic anemia. METHODS:A 7-year-old girl who had been confirmed as having severe aplastic anemia for 1.5 years received a cotransplantation of haploidentical hematopoietic stem cells combined with placenta-derived mesenchymal stem cells on July 9th , 2012. The donor was her mother. The preconditioning regimen consisted of fludarabine, cyclophosphamide, and anti-thymocyte globulin. RESULTS AND CONCLUSION:Time of neutrophil recovery (>0.5×10 9/L) was+9 days, and hematopoietic reconstruction was complete at+12 days. The short tandem repeat analysis showed 100%donor’s genotype at+100 days. Immunosuppressive drugs were stopped at+8 months, and no acute or chronic graft-versus-host disease occurred. With a fol ow-up of 18 months, she was in the disease-free survival period. Our findings suggest that the cotransplantation of al ogeneic haploidentical hematopoietic stem cells and placenta-derived mesenchymal stem cells is a new effective approach for children with severe aplastic anemia, which is worth exploring in the future.
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Objective To investigate the role of bone marrow mesenchymal stem cells (MSCs) transplantation in repairing injured intestinal mucosa of acute pancreatitis.Methods MSCs were harvested and cultured from femurs of male SD rats.Twenty female SD rats were divided into three groups,and serve acute pancratitis (SAP) model was induced by intraperitoneal injection of L-arginine (2 g/kg) twice.Twelve hours after SAP model established,MSC transplantation group (n=8) were injected MSCs (5 × 106 cell/rat) through tail vein for three days,and SAP group (n=6) were injected the same volume of saline through tail vein as control.Control group (n=6) were only injected the same volume of saline without any treatment.All the rats were sacrificed at 72 hours after model established.The small intestinal tissues were taken for HE staining and pathological score,the TNF-α mRNA and IL-1β mRNA expression level in small intestine and pancreas were tested by RT-PCR.Y chromo-some (Sry) gene in pancreatic and intestinal tissue was examined by polymerase chain reaction (PCR).Results The relative expression quantity of TNF-a mRNA and IL-1β mRNA in pancreas was significant higher in SAP group and MSC transplantation group than in control group (7.22 ± 1.99,3.46± 1.75 vs 1.32 ± 1.04 ; 2.71 ± 0.56,1.92 ± 0.28 vs 0.61 ± 0.45 ),the difference was statistically significant (F=18.375,F=22.701; P＜0.05).Compared with SAP group,the expression quantity of TNF-α mRNA and IL-1β mRNA in pancreas was significantly decreased in MSC transplantation group,the difference was statistically significant (P＜0.05).The relative expression quantity of TNF-α mRNA and IL-1β mRNA in small intestine was significantly higher in SAP group and MSC transplantation group than in control group (3.93 ± 1.08,2.13 ± 0.53 vs 0.68 ± 0.42 ; 2.44 ± 1.54,1.02±0.44 vs 0.60±0.14),the difference was statistically significant (F=21.772,F=6.132; P＜0.05).The expression of TNF-αmRNA and IL-1β mRNA in MSC transplantation group was lower than that in SAP group,the difference was statistically significant (P＜0.05).Compared with SAP group,pathological score indicated that small intestine injure was slighter in MSC transplantation group (3.83±0.28 vs 2.83±0.56),the difference was statistically significant (F=12.013,P＜0.05).Sry gene could be detected in the pancreatic and intestinal tissue of MSC transplantation group.Conclusion Allogeneic MSC transplantation group can inhibit Pro-inflammatory cytokines expression in acute pancreatitis,relieve the intestinal mucosa injury and may involve in the intestinal tissue repair.