BACKGROUND:Bone marrow mesenchymal stem cells (BMSCs) transplantation can promote cardiac repair after myocardial infarction, but it has been limited by the low cellsurvival rate.
OBJECTIVE:To study the effect of hydrogen sulfide (H 2 S) on the BMSCs transplantation for treatment of myocardial infarction.
METHODS:BMSCs were separated and cultivated form Sprague-Dawley rats weighing (100±20) g. The 4th generation cells were used for later experiment, and marked by DAPI at 2 hours before use. Fifty male Sprague-Dawley rats, weighing (200±20) g had been divided into five groups:Sham group (n=10) and four transplantation groups:BMSCs (n=10), H 2 S-BMSCs (n=10), H 2 S (n=10), normal saline (n=10). The myocardial infarction model of four groups was established except of sham group (only thread without ligation). The cardiac function was measured by echocardiogram at 4 weeks after celltransplantation. The col agen in the infarction area was tested by Masson staining.
RESULTS AND CONCLUSION:Severe myocardial fibrosis was found in the normal saline group, with no myocardial regeneration in the infarct area. H 2 S-BMSCs group had less col agen and more cardiac muscle tissue than BMSCs or H 2 S groups. Left ventricular ejection fraction and left ventricular fractional shortening of the H 2 S-BMSCs group were significantly higher than those of the BMSCs or H 2 S groups (P<0.05). The cells survival rate and cardiac function of myocardial infarction rats can be promoted by H 2 S-preconditioned BMSCs transplantation, which is superior to BMSCs or H 2 S alone.

This study was aimed to verify the chemical component cantharidin from Chinese blister beetle by LC-MS/MS. Components were first processed by HPLC to choose the appropriate separation conditions before LC/MS/MS analysis. Through the positive and negative ions pre-scan, positive ions scanning way was selected in the scanning of each separate component. The scanned maps were obtained and the relative molecular mass was deduced. The results showed that 8 types of cantharidin compounds were identified, including three isomers. It was concluded that LC-MS/MS was able to determine the chemical component cantharidin from Chinese blister beetle rapidly and accurately, which was existed in the body by the form of combined amino acid.

Aim To investigate the preventive effect of Polygonum Multiflorum (PM)on the deteriorated mi-cro-structure and biomechanical properties induced by prednisone.Methods Ninety 6-month-old male Sprague-Dawley rats were randomly divided into nine groups,which were control,prednisone,CAL,30%ethanol eluent of the PM(H,M,L),PM(H,M,L). Prednisone was gavaged to rat for 21 weeks as model group of osteoporosis.Meanwhile,tested herbal ab-stract were orally administrated to the modeled rats in-duced by prednisone.At the end of the experiment, the right femur was collected for micro-CT scanning, three-dimensional reconstruction and biomechanical test.Results Compared with the control group,mod-el group showed destruction of bone microarchitecture, BV /TV fell 28.6%(P <0.05),bone biomechanical parameters decreases,and stiffness fell 29.7%(P <0.01 ). Compared with the model group, positive group had significantly improved effect on bone micro-architecture,and biomechanical parameters,BV /TV increased 46.7%(P <0.01 ),and stiffness increased 25.9%(P <0.01 ).30% ethanol eluent of the PM (M,L)dose may improve bone microstructure by in-creasing BV /TV 46.7% (P <0.01 ),40.0% (P <0.05)respectively,PM(H)may improve the biome-chanical parameters by increasing stiffness 24.7%(P<0.05),and 30% ethanol eluent of the PM(H)and PMhigh-dose may improve the biomechanical parame-ters,but not as positive group.Conclusions Predni-sone reduces biomechanical properties of rat femur and deteriorates femoral microstructure.30% ethanol eluent of the PM(M,L)and PM(H)plays a preventive role in the changes of micro-structural and biomechanical properties by prednisone,and increases BMD,whereas other groups have no significant preventive effect.

Objective To investigate the prognosis and adverse reactions of patients with acute-on-chronic liver failure (ACLF) receiving artificial liver support therapy stratified by international normalized ratio (INR). Methods A total of 515 ACLF patients who received artificial liver support therapy in Department of Severe liver Disease, The Ninth Hospital of Nanchang, from January 2010 to May 2020 were enrolled, and according to the level of INR, they were divided into group A with 20 patients (INR < 1.5), group B with 115 patients (1.5≤INR < 1.9), group C with 179 patients (1.9≤INR < 2.6), group D with 61 patients (2.6≤INR < 3.2), group E with 75 patients (3.2≤INR < 4.2), and group F with 65 patients (INR≥4.2). All patients received multimodality medical treatment combined with artificial liver support therapy. The one-way analysis of variance was used for comparison of normally distributed continuous data between multiple groups; the Kruskal-Wallis H test was used for comparison of non-normally distributed continuous data between multiple groups。The chi-square test was used for comparison of categorical data between groups. Bonferroni correction was used for further comparison between two groups. and the receiver operating characteristic (ROC) curve was used to evaluate the value of INR and MELD scoring system in predicting the prognosis of ACLF patients. Results As for 90-day mortality rate, there was a significant difference between the six groups stratified by INR ( χ 2 =124.84, P < 0.001); there was no significant difference between groups A(25%), B(25.2%), and C(39.7%) ( P > 0.05), and there was a significant difference between groups D/E/F(65.6%, 82.7%, and 92.3%, respectively) and groups A/B/C (all P < 0.05); there was no significant difference between groups D and E and between groups E and F ( P > 0.05), and there was a significant difference between groups D and F ( P < 0.05). There was no significant difference in the incidence rate of intraoperative adverse reactions between the six groups ( χ 2 =8.956, P =0.111). INR had an area under the ROC curve of 0.786 (95% confidence interval: 0.746-0.825, P < 0.001) in predicting the prognosis of patients with ACLF receiving artificial liver support therapy, with a sensitivity of 66.7% and a specificity of 79.8%. Conclusion INR has a good value in predicting the prognosis of ACLF patients receiving artificial liver support therapy, and the artificial liver has good safety.