The ultrastructure of hepatic fat-storing cells in rat embryos was investigatedwith transmission electron microscope.It is considered that the rat fat-storingcells originate from mesenchymal cells.As the embryo develops,the fat-storing cell decreases in size gradully,this isespecially obvious at the time of birth.This may be related with the function of thistype of cell.In the hepatic fat-storing cell in embryo of 10 to 12 days,the roughendoplasmic reticulum has developed,the cell is rich in free ribosomes,and collagenfibrils may be observed in Disse's spaces.This indicates that the fat-storing cellshave possessed the function of synthesizing collagen.In embryo of 13 to 15 days,fat droplets appear in a few fat-storing cells and smooth endoplasmic reticulum, glycogen granules and pinocytosis may be seen at this time.It is suggested that thefunction of the uptake and storage of vitamin A may appear at that time too.There are desmosomes between the fat-storing cell and the hepatocyte.On the 16to 18 days,desmosomes are also present between the fat-storing cell and endothelialcell.This indicates that fat-storing cells are not free cells,but are bound to hepa-tocytes and endothelial cells via cellular junctions,At that time,microfilaments andmicrotubules are found in fat-storing cells,they are the skeleton of the cells andthey may be related to the regulation of the size of the sinusoids.In thedevelopment of embryo,the number of fat-storing cells and fat droplets have notincreased markedly,therefore,it is thought that they are increased after birth.

Objective To study the effect of berberine on arrhythmia caused by stretch of rats' myocardium,in vitro,after myocardial ischemia (MI) for 30 min.Methods The study was carried out in the laboratory of Heilongjiang traditional Chinese medicine university.A total of 40 Wistar rats were randomly (random number) divided into 4 groups,namely normal control group,berberine group、MI group and MI + berberine group.After perfusion of rat' s heart with Langendorff perfusion device,the model of MI was made with ligation of left anterior descending branch for 30 min.Berberine was dissolved in Tyrode' s solution to a concentration of 300 μmol/L.The hearts were stretched for 5 s by 0.2 ml.The effect of stretching was observed for 30 s to record 90％ monophasic action potential (MAPD90),premature ventricular beats (PVB) and ventricular tachycardia (VT).Quantitative data were compared with ANOVA.Qualitative data were compared with a x2 test.Differences with a value of P ＜ 0.05 were considered statistically significant.Results MAPD90 in normal control and MI group obviously prolonged after the hearts were stretched ( P ＜ 0.01 ).And MAPD90 in MI group was even longer than that of normal control group (P＜0.05).Berberine had no influence on MAPD90 before myocardiuml stretched (P ＞0.05),while it could reduce the degree of prolongation in MAPD90 after myocardium stretched (P ＜ 0.05 or P ＜0.01 ).The incidence rate of PVB and VT in normal control and MI group increased after stretched.The berberine in dose of 300 μmol/L could reduce the incidence of PVB and obviously inhibit the occurrence of VT ( P ＜ 0.01 ).Conclusions Berberine could obviously inhibit the occurrence of stretch-inducedarrhythmias after myocardial infarction.

AIM:To explore the effect of long-term (6 months) endogenous testosterone deprivation by orchidectomy on the function of voltage-dependent potassium channels of vascular smooth muscle cells in rats. METHODS:Wistar rats were raised for 6 months after castration. Isometric tension measurement of aortic rings,whole-cell patch-clamp technique and Western blotting analysis were employed to examine the functional and posttranscriptional alterations of voltage-dependent potassium channels. RESULTS:Voltage-dependent potassium channel blocker,4-aminopyridine,significantly decreased the constriction of aortic artery rings from male rats after 6-month castration. In castrated rats the amplitude of voltage-dependent potassium currents of aortic artery smooth muscle cells was significantly decreased compared with that in control rats. Meanwhile,the expression of Kv 1.5 channel protein,which plays an essential role in mediating vasomotor function,was also reduced. The functional and molecular alterations of voltage-dependent potassium channels were both restored when the rats were concomitant applied with physiological level of testosterone after castration. CONCLUSION:Long-term deprivation of endogenous testosterone in rats significantly attenuates the function of voltage-dependent potassium channels,and the decreases in expression of Kv1.5 channel protein accounts for this alteration. Long-term application of physiological concentration of testosterone,which recovered the impaired function of voltage-dependent channels,may be beneficial for male gender with hypotestosteronaemia.

ObjectiveTo investigate the effect of β-adrenoceptor (β-AR) blockers on G protein and heart function changes in rats with acute myocardial infarction (AMI) MethodsWistar rats with AMI induced by left anterior descending coronary branch ligation were randomly divided into compared with sham operation group. Eight weeks after therapy, hemodynamics was assessed by inserting catheters and the level of G protein was detected by Western blot analysis. ResultsCompared with the sham operation group, systolic blood pressure(SBP), diastolic blood pressure (DBP), left ventricular systolic pressure(LVSP) and left ventrieular pressure maximal rate of rise and fall(±dp/dtmax) in AMI group were significantly decreased, while left ventricular end diastolic pressure (LVEDP) and Gs and Gi protein levels were significantly increased (all P<0.05). Compared with AMI group, LVSP and ± dp/dtmax were increased, but LVEDP and Gi protein level were significantly decreased in metoprolol and carvedilol group. LVEDP and Gi protein level were decreased in carvedilol group compared with metoprolol group. ConclusionsCarvedilol can effectively suppress the change of G protein and improve the heart function after AMI, and the effect is better than that of metoprolol. This may be related with its β2-AR blocking effect.

Objective:To investigate the changes and clinical significance of serum S100β and neuron-specific enolase (NSE) levels of children with acute brain injury(ABI).Methods:100 children with ABI treated in the pediatric intensive care unit (PICU) of the Affiliated Hospital of Inner Mongolia Medical University from June 2019 to June 2020 were prospectively selected as the ABI group, and 30 normal children in the children′s health clinic of the hospital were selected as the control group. The serum S100β and NSE levels of all subjects was detected. According to the Glasgow Coma Scale (GCS), children with ABI were divided into severe brain injury group ( n=26), moderate brain injury group ( n=35) and mild brain injury group ( n=39). The prognosis of children with ABI after 3 months of treatment was evaluated according to the Glasgow prognosis scale (GOS) and they were divided into poor prognosis group ( n=26) and good prognosis group ( n=74). The relationship between serum S100β and NSE levels and the severity and prognosis of children with ABI was analyzed. Results:The serum S100β and NSE levels in the ABI group were significantly higher than those in the control group, and the serum S100β and NSE levels in children with ABI increased with the severity of injury and poor prognosis ( P<0.05). Pearson correlation analysis showed that serum S100β and NSE levels in children with ABI were positively correlated with GCS scores ( r=0.521, 0.643, P<0.05). Multiple logistic regression analysis showed that glucose(GLU) ( OR=1.631, 95% CI: 1.278-2.082), S100β ( OR=1.907, 95% CI: 1.558-5.877), NSE ( OR=2.896, 95% CI: 1.193-7.029) were independent prognostic factor in children with ABI ( P<0.05). Receiver operating characteristic (ROC) curve showed that the sensitivity, specificity and accuracy of serum S100β+ NSE [area under curve (AUC)=0.932, 95% CI: 0.875-0.969] in predicting the poor prognosis of children with ABI were higher than those of serum S100β(AUC=0.728, 95% CI: 0.643-0.803), NSE (AUC=0.808, 95% CI: 0.729-0.871) alone. Conclusions:The levels of serum S100β and NSE in children with ABI aresignificantly increased, which are closely related to the severity of the disease and prognosis. They can be used as predictors of poor prognosis in children with ABI. Combined detection can enhance the diagnostic value.

[Abstract] Objective: To construct a circRNA profile of esophageal squamous cell carcinoma (ESCC) and analyze differentially expressed circRNAs. Methods: Samples were taken from 3 patients with esophageal squamous cell carcinoma who were hospitalized in the Department of Thoracic Surgery, Jintan Hospital, Jiangsu University from June 2018 to February 2019. The circRNA expression profile was constructed by high-throughput sequencing technique, and the circRNA differentially expressed in 3 pairs of esophageal squamous cell carcinoma tissues and adjacent tissues was detected. The biological functions and related signal pathways of these circRNA were analyzed by GO and KEGG techniques. Results: By comparing the expression levels of circRNA between esophageal squamous cell carcinoma and adjacent tissues, 905 differentially expressed circRNA were found, of which 404 were up-regulated and 501 were down-regulated. hsa_circ_0004390 was the CIRC RNA with the highest up-regulation factor (FC=7.9712), and novel_circ_0012687 was the one with the highest down-regulation factor. GO and KEGG analysis showed that these circRNA may be involved in biological processes such as cell cycle, cell components and protein binding of cancer cells, and signal pathways such as Hippo and cGMP-PKG. Conclusion: The expression profile analysis of circRNA in esophageal squamous cell carcinoma showed that the significantly differentially expressed circRNA could be used as a potential biomarker of esophageal squamous cell carcinoma.