Objective To investigate the protective effect of pinacidil on the intestinal mucosa of scalded rats and the mechanism. Methods A total of 24 healthy SD rats were randomly divided into normal control group, burn group, and pinacidil treated group. Rats in burn group and pinacidil treated group were inflicted with 30% TBSA Ⅲ degree burn and resuscitated intraperitoneally with Ringer's solution immediately after burn. Pinacidil was injected intraperitoneally into rats in pinacidil treated group at the dose of 2 mg/kg. Mitochondrial respiratory function intestinal mucosa and levels of reactive oxygen species (ROS), maleic dialdehyde (MDA), and superoxide dismutase (SOD) in plasma were determined at 6 h after burn. Results Mitochondrial respiratory function control rate (RCR), ST3, and SOD levels in pinacidil treated group were evidently higher than those in the burn group. However, ST4, MDA, and ROS levels in pinacidil treated group were significantly lower than those in the burn group, but ST4 was not significantly different from that in the normal control. Conclusion Pinacidil can attenuate the damage of intestinal mucosa in scalded rats.

OBJECTIVETo investigate the apoptosis and proliferation effect of matrine on human medulloblastoma cell line D341 in vitro and the effect of the expression of the related caspase 3 and caspase 9 proteins.

METHODSThe D341 cells were cultivated successfully in vitro. Then the cells were divided into 5 groups according to the concentration of matrine (0.5 mg/mI group, 1.0 mg/ml group, 1.5 mg/ml group, 2.0 mg/ml group and the control group was 0 mg/ml). All the experiments were repeated three times. The cell morphologic and structure change was observed with the optical microscope and the transmission electron microscope. The proliferation of D341 cell was analyzed using Cell Counting Kit-8 assay. Apoptosis was detected by Annexin V-FITC/PI double staining. The expression of Caspase3 and Caspase9 was detected by Western blot.

RESULTSWith the effect of matrine, the proliferation inhibition rate gradually increased with drug concentrations increasing, and there was a significant difference (P < 0.01). The inhibitory effect of matrine on cell proliferation was different with the different treatment time, there was a significant difference between the 24 h to 72 h groups (P < 0.01). The apoptotic rate increased with matrine concentrations increasing. There were significant differences between the group of 0.5 mg/mI or 1.0 mg/mI to the group of 1.5 mg/mI or 2.0 mg/mI (P < 0.05). The apoptotic rate increased with the prolonged treatment time. There were significant differences between the group of 24 h or 48 h to the group of 72 h ( P < 0.05). With the increase of matrine concentration, the expression of Caspase 3 and Caspase 9 increased (P < 0.01).

CONCLUSIONMatrine induces the apoptosis, and inhibits the proliferation of human medulloblastoma D341 cells in vitro by up-regulation of the expression level of Caspase3, Caspase9.

Alkaloids ; pharmacology ; Apoptosis ; Caspase 3 ; metabolism ; Caspase 9 ; metabolism ; Cell Line, Tumor ; Cell Proliferation ; Cerebellar Neoplasms ; metabolism ; pathology ; Humans ; Medulloblastoma ; metabolism ; pathology ; Quinolizines ; pharmacology ; Up-Regulation

Objective To clone and sequence the cDNA encoding(S)-N-methylcoclaurine-3'-hydroxylase from Coptis chinensis.Methods The cDNA,encoding(S)-N-methylcoclaurine-3'-hydroxylase,was amplified by RT-PCR with cDNA library of tender leaf as the template.Results The full-length cDNA of(S)-N-methylcoclaurine-3'-hydroxylase(named as CYP80B3) had 1 680 bp with an open reading frame encoding 488 amino acids of protein.The CYP80B3 had 95%,82%,70%,and 68% amino acid sequence homology to the sequence of(S)-N-methylcoclaurine-3'-hydroxylase from C.japonica,Thalictrum flavum,Eschscholzia californica and Papaver somniferum,respectively.The sequence was reported to the GenBank and coded as EF492879.Comparison of sequence with(S)-N-methylcoclaurine-3'-hydroxylase from C.japonica showed CYP80B3 possessed the same functional regions involved with 3'-hydroxylation of(S)-N-methylcoclaurine.Conclusion The cDNA encoding CYP80B3 from C.chinensis was cloned and reported.This work underlays the first step for exploring the pathway of benzylisoquinoline alkaloid biosynthesis and for improving the content of benzylisoquinoline alkaloid in C.chinensis.

Adult ; Altitude ; Case-Control Studies ; Humans ; Immunoglobulins ; blood ; Occupational Exposure ; T-Lymphocyte Subsets ; immunology

Humans ; Industry ; Metals ; Occupational Injuries ; United States

BACKGROUND:It is unclear whether short-term high-intensity interval training (HIT) can be used to protect against myocardium injury after acute myocardial infarction, as wel as the underlying mechanism.
OBJECTIVE:To observe the effects of short-term HIT on the ventricular remodeling and mitochondrial content after acute myocardial infarction, and the biological effect of mitochondrial biogenesis and autophagy in this process.
METHODS:Male Sprague-Dawley rats were modeled into acute myocardial infarction by ligating coronary artery. One week later, HIT was performed:each interval consisted of 4-minute high-intensity running (80%of maximal oxygen consumption) and 3-minute active recovery (40%of maximal oxygen consumption), for 4 consecutive weeks of 5 days each week, repeated 7 cycles.
RESULTS AND CONCLUSION:Four-week HIT after acute myocardial infarction could markedly enhance left ventricular pump function and mitochondrial content, improve mitochondrial membrane potential and ATP synthetic activity, inhibit mitochondrial reactive oxygen species generation, up-regulate PGC-1α/Tfam induced mitochondrial biogenesis and Bnip3/Beclin-1 induced autophagy. These results indicate that short-term HIT can improve normal mitochondrial content after acute myocardial infarction, which in turn ameliorates myocardial systolic property and energy metabolism. As a cardiac rehabilitation method, HIT exhibits fine timeliness.

Objective To investigated the different effect of moderate-intensity continuous training (MCT) and high-intensity interval exercise training (HIT) on ventricular remodeling and mitochondrial homeostasis after acute myocardial infarction (AMI).Methods The AMI rat model was achieved by ligating coronary artery.The AMI and sham operation rats were randomly (random number) divided into four groups:sham operation group (Sham),AMI control group (AMI),AMI MCT group (AMI + M),and AMI HIT group (AMI + H).Animals in the AMI + M and AMI + H groups underwent 4 weeks MCT and HIT respectively.Five weeks after AMI,hemodynamic changes,mitochondrial bioenergetics,and PINK1,Beclinl,Mfn2,Drp1,Tfam,COXⅣ,PGC-1α were detected.Results Comparing with AMI group,in AMI + M and AMI + H groups,Beclin1,PINK1,Mfn2 and PGC-1α expression elevated significantly (P ＜0.05 or P ＜0.01),whereas ROS generation and Drp1 expression showed dramatic decrease (P ＜ 0.05 or P＜0.01).In addition,in AMI + H group,±dp/dt max,mitochondrial membrane potential,ATP synthesis activity,Tfam and COXⅣ expression improved significantly (P ＜ 0.05).Comparing with AMI + M group,in AMI + H group,± dp/dt max,PGC-1α,Tfam and COX Ⅳ expression improved significantly (P ＜ 0.05).Conclusions HIT is superior to MCT for ameliorating ventricular remodeling and mitochondrial homeostasis after AMI.

BackgroundWhether the peeling of the inner limiting membrane (ILMP) increase the closure rate of idiopathic macular hole is still in controversy.Some ophthalmologist recommend vitrectomy combined with inner limiting membrane peeling for the treatment of idiopathic macular hole.However,the removal of ILMP is difficult because of its similar appearance to adjacent tissues.Objective This study was to investigate the efficacy of triamcinolone acetonide(TA) and indocyanine green(ICG) double staining-assisted vitrectomy combined with ILM peeling during the surgery.Methods A consecutive case- observational study was designed.The standardized vitrectomy was performed in 25 eye of 23 cases with IMH.During the vitrectomy,TA and ICG were injected into posterior pole vitreous to visualize and assist the ILM peeling.The dying effectiveness was observed,and the closure rate of macular hole,visual acuity,intraocular pressure and complications were evaluated after surgery.Written informed consent was obtained from each patient prior to operation.Results Posterior vitreous cortex and ILM were visible and the residual vitreous and cortex were removed clearly after dying of TA and ICG in all the 25 eyes.During the following-up duration of 3-8 months,the completely anatomical reattachment of the macular area was in 22 eyes ( 88.0％ ) and partially reattachment in 3 eyes( 12.0％ ).The best corrected vision was 0.07-0.60 in all of the operated eyes 2 months after surgery.Conclusions TA and ICG- assisted vitrectomy combined with ILM peeling appears to be a safe and effective method for IMH repair.

Objective To construct tissue engineering nucleus pulposus by culture of rabbit bone marrow mesenchymal stem cells (rBMSCs)-nucleus pulposus acellular matrix scaffold (NPAMS)complexes (rBMSCs-NPAMS).Methods Several NPAMS were prepared,and rBMSCs was seeded into NPAMS.The scaffolds and complex were detected by general observation,HE stai-ning,immunohistochemical,qRT-PCR,scanning electron microscopy.Results The scanning electron microscopy showed the seed cell in nucleus pulposus ECM-derived scaffold could adhesion and growth.The cell attachment and proliferation were observed by HE staining.Immunohistochemical examination with typeⅡ collagen showed positive results.qRT-PCR revealed the time-depend-ent of the mRNA expression of collagen Ⅱ,and which was smaller than positive control(P<0.01).The relative expression of Ag-grecan mRNA grew in a time dependent fashion,which was still lower than positive control(P<0.01).Scaffolds and normal nucle-us pulposus had no statistical significance of the compression load under the same displacement of the compression(P>0.05).Con-clusion Natural nucleus pulposus acellular matrix scaffold composite allogeneic bone marrow mesenchymal stem cells can be suc-cessfully built into tissue engineering nucleus pulposus.

Objective To evaluate the value of three-dimensional color power angiography(3D-CPA) in the differential diagnosis of benign and malignant breast tumors.Methods 3D-CPA vascular parameters were collected and analyzed in 121 breast solid lesions (63 malignant,58 benign) in the 114 female patients.The diagnostic performances of each parameter were compared by receiver operating characteristic (ROC)cure.Results The parameters of intra-tumor flow index (FI1),flow index of shells with outside thickness of 3mm surrounding the breast tumors(FI2 ) and the ratio of FI2 and FI1 (G2) in malignant group were significantly higher than those in benign group( P ＜0.05,respectively).Analysis of the areas under ROC curve showed that the areas under FI2 curve was the largest.No significant difference( P ＞0.05) was found between the area under FI2 curve and the area under G2 curve.Comparing the area under FI2 curve to that under FI1,there was significant differences ( P ＜ 0.05).Taking FI2 ≥ 27.385 as the critical value,the sensitivity and specificity for the diagnosis of malignant breast tumors were 88.9％ and 81.0％,and the positive and negative predictive values were 83.6％ and 87.0％ respectively.Conclusions The sensitivity and specificity of 3D-CPA parameter FI2 in the diagnosis of malignant breast tumors were higher than others,FI2 with the optimal critical value of ≥27.385 could help to identify malignant from benign breast tumors.