Multiple organ dysfunction syndrome in pediatrics / 国际儿科学杂志

Multiple organ dysfunction syndrome(MODS),a hot topic worldwide,has made rapid progress with nigh mortality.MODS in pediatrics versus MODS in adults are similar but different.Due to special age-related physiological characteristics.It is difficult to carry out randomized controlled clinical study compared with adults.Diagnosis and treatment of pediatric MODS can only be obtained with reference to adult MODS.This study reviews on the epidemiology,clinical scoring system,pathogenesis,clinical features and treatment of MODS in pediatrics.

Research progress of uncoupling protein 2 in pathophysiology of sepsis / 中华实用儿科临床杂志

Uncoupling protein 2 (UCP2) is a proton transporter which presents in the mitochondrial inner membrane.Recently studies found that UCP2 plays important roles in regulation of reactive oxygen species production,maintenance of mitochondrial function,as well as inflammation and blood glucose control.These features have important relevance with the pathophysiologic mechanism of sepsis.

Concurrent exercise intervention in rats with metabolic endotoxemia induced by high-fat diet and their liver mitochondrion / 中华实用儿科临床杂志

Objective To investigate the effect of concurrent exercise intervention in metabolic endotoxemia induced by high-fat diet in rats,and further understand the damage of liver mitochondrial ultramicrostructure.Methods Eighteen SD rats with the weight of 100g were randomly divided into 3 groups:group A (standard diet group),group B(high-fat diet group) and group C (treadmill-trained group with high-fat diet).Training (1 hour/d) initiated at the same time as the HF diet was fed.After being raised for 6 weeks,the rats was euthanized and weighed up.Blood samples were taken and the levels of serum lipid were detected.The levels of serum endotoxin were detected by enzyme-linked immunoadsorbent assay.The membrane potentials of isolated mitochondrion were detected by flow cytometry instrument and the morphologic changes in mitochondria in liver were observed by electronic microscopy.Results In group B,the levels of endotoxin increased significantly(2.916 ± 0.761 rs 5.454 ± 1.254,t =-4.236,P ＜ 0.05),and the liver mitochondrial density and membrane potential also increased significantly compared with group A after 6 weeks (4.330 ±0.501 vs 3.507 ±0.532,t =2.759,P ＜0.05;l.660 ±0.202 vs 0.473 ±0.064,t =13.712,P ＜0.05).But there was no markedly different in serum endotoxin between group B and group C (4.972 ± 1.757 vs 5.454 ± 1.254,t =-0.547,P ＞ 0.05).Compared with group B,the liver mitochondrial density of group C decreased significantly (4.330±0.501 vs 3.581 ±0.188,t =3.426,P ＜ 0.05).The mitochondrial ultrastructurctural changes in each group were not obvious.Conclusions The rats fed with high-fat diet for 6 weeks can reach the state of metabolic endotoxemia.The increasing levels of the liver mitochondrial membrane potential caused by metabolic endotoxin may affect the happening and development of other diseases in the future.Concurrent exercise can not decrease the level of endotoxin.It also shows that metabolic disease caused by high-fat diet should be prevented by moderation in eating and drinking.

Cloning, expression and antigenic analysis of VP1-VP4 gene encoding the structural protein of Coxsackie virus A16 / 南方医科大学学报

<p><b>OBJECTIVE</b>To clone and express VP1-VP4 genes encoding the structural proteins of Coxsackie virus A16 and analyze the antigenicity of the expressed recombinant proteins.</p><p><b>METHODS</b>The VP1-VP4 cDNAs were amplified with RT-PCR from the extracted viral RNA and cloned into pMD19-T vectors. The VP1-VP4 genes were inserted to the multi-cloning sites of the plasmid pQE30a, and the protein expressions in E. coli M15 were induced by IPTG. After purification by washing with 8 mol/L urea under denaturing condition, the recombinant proteins were identified by Western blotting and ELISA for their immunogenicity against rabbit antisera of Coxsackie virus A16 and enterovirus 71, respectively.</p><p><b>RESULTS</b>The recombinant VP1-VP4 proteins were highly expressed in E. coli M15. The purified proteins could be recognized by rabbit antiserum of Coxsackie virus A16 and showed cross reactivity with the rabbit antiserum of Enterovirus 71.</p><p><b>CONCLUSION</b>The recombinant Coxsackie virus A16 VP1-VP4 proteins obtained possess good antigenicity.</p>

Effect of atorvastatin on cardiac function and TGF-β1 signaling pathway after acute myocardial infarction in rats / 南方医科大学学报

<p><b>OBJECTIVE</b>To investigate the effect of atorvastatin on cardiac remodeling and function after acute myocardial infarction (AMI) in rats and whether this effect is mediated by transforming growth factor-β1 (TGF-β1) signaling pathway.</p><p><b>METHODS</b>AMI was induced by left coronary artery ligation in 64 male Sprague-Dawley rats, and 45 surviving rats were randomized into control group (n=15), low-dose atorvastatin group (10 mg/kg, n=15) and high-dose atorvastatin group (20 mg/kg, n=15). Similar surgical procedure was performed in sham-operated rats (n=15) without coronary ligation. Atorvastatin was given daily by gavage from the first day after AMI. Eight weeks later, the cardiac function, left ventricular weight/body mass index (LVMI), collagen volume fraction (CVF), and the expressions of TGF-β1 and Smad2 were compared between the groups.</p><p><b>RESULTS</b>AMI caused significantly reduced cardiac function, increased LVMI and CVF, and upregulated expressions of TGF-β1 and Smad2 mRNA and proteins in the control group (P<0.05). The cardiac function, LVMI, and CVF were improved by atorvastatin, which also down-regulated the expressions of TGF-β1 and Smad2 (P<0.05), and the effects were more prominent in high-dose atorvastatin group (P<0.05).</p><p><b>CONCLUSION</b>Atorvastatin can dose-dependently improve cardiac remodeling and function after AMI in rats, which is mediated by regulating the activity of TGF-β1/Smad2 signaling pathway.</p>

Effect fo mental practice on grasping skills of minimally invasive surgery for clinical college students / 中华行为医学与脑科学杂志

Objective Using Mental Practice as a training method to train students grasping skills of minimally invasive surgery(MIS),and analyze the change of mental practice in training grasping skills of MIS.Methods 36 students were randomly divided into mental practice training group (MPTG) ( n =12 ),conventional training group (CTG) ( n=12),control group (CG) ( n=11 ).Under the uniform appraisal standards and conditions,using different training methods to teach the grasping skills of MIS,and analyze the results statistically.Results MPTG' s pre-training test results ( 16.18 ± 5.73 ) and post-training test results (79.47 ± 22.05 ) were significantly different(P ＜ 0.001 ),post-training and two weeks later test results ( 89.32 ± 31.56) displayed no significant difference(P=0.283) ; CTG' s pre-training test results ( 17.47 ±8.33) and post-training test results (57.18± 21.83 ) were significantly different (P ＜ 0.001 ),post-training and two weeks later test results (42.27 ± 24.64)had significant difference(P=0.048) ; CG's pre-training test results ( 18.19 ± 4.74) and post-training test results (38.04 ± 19.13 ) were significantly different(P =0.003 ),post-training and two weeks later test results (23.71 ±15.71 ) had significant difference (P=0.034).Compared with MPTG in pre-training test,CTG (P=0.632) and CG (P =0.464) neither had significant difference,but in the post-training test,CTG (P =0.014) and CG (P ＜0.001 ) both had significant difference compared with MPTG.In the two weeks later test,CTG and CG both (P＜0.001 ) had significant difference compared with MPTG.Conclusion Mental practice training method can improve the pedormance of gasping skills of MIS significantly and better durability,improve the learning curve,easy to implement in teaching,easy to master students,it will be a new method of MIS skills training in the future.

Radical surgery of kidney cancer by post-pyelic retrograde free control of renal pedicle / 中国医师进修杂志

Objective To explore the effect on radical surgery of kidney cancer by post-pyelic retrograde free control of renal pedicle. Methods The patients with pre-T3a stage kidney cancer were divided into two groups, 50 patients in traditional surgical group (traditional group) and 52 patients in post-pyelic retrograde free control of renal pedicle group(research group). The surgical duration, hemarrhage volume, local tumor recurrence in one year after operation, and distal metastasis rate had been compared between the two groups. Results One hundred and two patients underwent successful operations and had one year of follow-up as scheduled after being discharged from hospital. The traditional group took (130± 37) min for surgical duration, and had (400 ± 306) ml of hemarrhage volume; and the research group took (99 ± 28) min for surgical duration, and had (280 ± 225) ml of hemarrhage volume,there were significant difference between the two groups (P < 0.05). After one year of follow-up, 2% (1/50) of local recurrence rate and 6%(3/50) of distal metastasis rate occurred in the traditional group,and only 2% (1/52) of local recurrence rate and 4% (2/52) of distal metastasis rate happened in the research group. There were no obvious difference between the two groups. Conclusion The radical surgery of kidney cancer by post-pyelic retrograde free control of renal pedicle has such features as easy performance, short surgical duration, less hemarrhage, and can lower the surgical risk, achieve satisfactory efficacy and deserve popularization.