Objective To study the effect of different doses of monocrotaline in combination with isopropylarterenol on the hemodynamic resonse, heart index and right heart hypertrophy index in rats.Methods Sixty-four healthy adult SD rats, male:female=1∶1, body weight 200-250 g, were randomly divided into blank control group (n=16) and three model groups (n=16 in each group).The high dose model group (n=16) received i.p.injection of monocrotaline 80 mg/kg once and epinephrine 10 mg/kg once daily for one week.The moderate dose group received i.p. injection of monocrotaline 55 mg/kg once and epinephrine 8 mg/kg once daily for one week.The low dose group received i. p.injection of monocrotaline 30 mg/kg once and epinephrine 3 mg/kg once daily for one week.The rats were fed for 6 weeks, and then pulmonary artery pressure and right ventricular pressure were tested and heart index and right ventricular hypertrophy index were determined.Results Compared with the control group, the mean pulmonary artery pressure and right ventricular systolic blood pressure in the low dose monocrotaline group were not significantly changed, but significantly changed in the moderate dose monocrotaline group ( P<0.05) .The heart index and right ventricular hypertrophy index in the low dose monocrotaline group were not significantly changed, but in the moderate dose monocrotaline group, the heart index was significantly reduced ( P<0.01 ) and the right ventricular hypertrophy index was significantly increased ( P<0.05 ) .Conclusions The use of a single injection of 55 mg/kg monocrotaline in combination with continuous injection of 8 mg/kg isopropylarterenol once daily for one week can ensure the survival rate of rats, and the successful formation of pulmonary artery hypertension, leading to heart weakness.

Objective To analyze the clinical features and causes of benign paroxysmal positional vertigo(BPPV).Methods The clinical data of 521 patients with BPPV were collected.The percentage of patients with BPPV in all the outpatients with dizziness and vertigo,the clinical characteristics of BPPV,and the prevalence of comorbidity with migraine were analyzed.Results BPPV accounted for 35.7% of patients with vertigo and 12.1% of patients with dizziness.Among the 521 patients with BPPV,158(30.3%)were male and 363(69.7%)were female,with an average age of(57.5?12.8)years old(20 to 93 years old).Right semicircular canals were involved in 323 cases(62.0%),and left semicircular canals in 187 cases(35.9%).The latency period of nystagmus of vertical canals was(3.22?2.37)s,and time of persistence was(8.31?7.98)s.The latency period of nystagmus of horizontal canals was(2.33?1.50)s,and the time of persistence was(14.77?11.40)s.There were significant differences in the latency period of nystagmus and time of persistence between the vertical and horizontal canals(P=0.001 and P=0.000).Fifteen patients(2.9%)had a history of head trauma and 39(7.5%)were complicated with migraine.Conclusion BPPV is prevalent in patients with dizziness and vertigo,and misdiagnosis and missed diagnosis should be avoided.

Lipid metabolism disorder is an important risk factor to obesity, hyperlipidemia and type 2 diabetes as well as other chronic metabolic disease. It is also a key target in preventing metabolic syndrome, chronic disease prevention. Plant polyphenol plays an important role in maintaining or improving lipid profile in a variety of ways. including regulating cholesterol absorption, inhibiting synthesis and secretion of triglyceride, and lowering plasma low density lipoprotein oxidation, etc. The purpose of this article is to review the lipid regulation effects of plant polyphenols and its related mechanisms.
Animals ; Humans ; Lipid Metabolism ; drug effects ; Metabolic Diseases ; drug therapy ; metabolism ; Polyphenols ; pharmacology

Calcium hydroxide (CH) is applied to improve disinfection of root canals in most root canal retreatment. This study aimed to analyze the CH removal efficacy using 7 different root preparing files (K file, pre-curved K file, EndoActivator, Ultrasonic file, pre-curved ultrasonic file, F file and needle irrigation alone) with apical transportation. Standardized models of curved canal with such apical transportation or not were set up before applying CH to root canal for 7 days. Seven techniques described above were used for its removal. Then the roots were disassembled and digital photos were taken. The ratio of residual CH in the overall canal surface was calculated using the image analyzer image pro plus 6.0. The data were analyzed using one-way ANOVA with post hoc Tukey test. Results revealed that CH was effectively removed (P<0.05) by using all 6 mechanical methods except irrigation alone. In curved root canals with apical transportation, EndoActivator, pre-curved ultrasonic file and F file were found to be more effective in removing CH than the other four file (P<0.001), while there was no significant difference among EndoActivator, pre-curved ultrasonic file and F file groups (P>0.05). The percentage of residual CH in the canal with apical transportation was higher than that in the canal without apical transportation (P<0.05). In conclusion, CH can be hardly removed completely. Canal with apical transportation will result in insufficient CH removal. EndoActivator, pre-curved ultrasonic file and F file are more effective in the curved root canal with apical transportation.

Objective To explore effect of endogeneous gangliosides(Gls) and integrin ?2?1 on protein phosphotyrosine expression of pp125 focal adhesion kinase (pp125FAK) after adhesion of SK-N-SH neuroblastoma cells to collagen(Col).Methods SK-N-SH cell line with high expression of integrin ?2?1 was cultured in presence of D-threo-1-phenyl-2-decanolamino-3-morphinoline-1-propanol(D-PDMP).Effect of endogeneous Gls,anti-?2 and anti-?1 monoclonal antibody on protein phosphotyrosine expression of pp125FAK during adhesion of SK-N-SH cells to Col were determined by immunoprecipitate and Western blotting.Results After 6 days,endogenous Gls in cells were almost depleted.Gls-depletion,anti?2 and anti-?1 monoclonal antibody were able to decrease pp125FAK expression of SK-N-SH cells adherent to Col respectively.GD2,the major component of neuroblastoma cell Gls could reco-ver pp125FAK expression to a certain degree.Conclusions Endogenous tumor Gls regulate protein phosphotyrosine expression of pp125FAK during adhesion of neuroblastoma cells to Col.It is suggested that tumor Gls may increase signal transduction of tumor cell integrin ?2?1 by increasing tyrosine phosphorylation of pp125FAK.

To introduce scientific research innovation into undergraduate education, cultivating innovative talents has been an urgent mission of current higher education. This article reviewed our experience, with the introduction of producing-studying-researching platform built on original innovative achievements of Chongqing medical university,of training physical medicine physician to be practical talents of large-scale diagnostic and therapeutic medical equipments, and was aimed to explore introducing producing-studying-researching platform into undergraduate education as well as improve personnel training quality of undergraduates.

Cells, Cultured ; Chemokine CCL4 ; Chemotaxis, Leukocyte ; drug effects ; Endothelial Cells ; cytology ; metabolism ; Homocysteine ; pharmacology ; Humans ; Macrophage Inflammatory Proteins ; biosynthesis ; genetics ; Monocytes ; physiology ; RNA, Messenger ; biosynthesis ; genetics ; Umbilical Veins ; cytology

To explore the antibacterial activity and mechanism of total alkaloids and berberine from Coptidis Rhizoma on Aeromonas hydrophila, and determine the effect of total alkaloids and berberine from Coptidis Rhizoma on minimum inhibitory concentrations, permeability and fluidity of cell membrane, conformation of membrane proteins and virulence factors of A. hydrophila. The results showed that both total alkaloids and berberine from Coptidis Rhizoma had antibacterial activities on A. hydrophila, with minimum inhibitory concentrations of 62.5 and 125 mg · L(-1), respectively. Total alkaloids and berberine from Coptidis Rhizoma could increase the fluidity of membrane, change the conformation of membrane porteins and increase the permeability of bacteria membrane by 24.52% and 19.66%, respectively. Besides, total alkaloids and berberine from Coptidis Rhizoma significantly decreased the hemolysis of exotoxin and the mRNA expressions of aerA and hlyA (P < 0.05, P < 0.01), the secretion of endotoxin and the mRNA expression of LpxC (P < 0.05, P < 0.01). The results suggested that the antibacterial activity of total alkaloids and berberine from Coptidis Rhizoma on A. hydrophila may be related to the bacteria membrane injury. They inhibited the bacterial growth by increasing membrane lipid fluidity and changing conformation of membrane proteins, and reduced the secretion of virulence factors of A. hydrophila to weaken the pathogenicity.
Aeromonas hydrophila ; drug effects ; genetics ; metabolism ; Alkaloids ; pharmacology ; Anti-Bacterial Agents ; pharmacology ; Bacterial Proteins ; genetics ; metabolism ; Bacterial Toxins ; biosynthesis ; Berberine ; pharmacology ; Cell Membrane ; drug effects ; genetics ; metabolism ; Coptis ; chemistry ; Drugs, Chinese Herbal ; pharmacology ; Membrane Fluidity ; drug effects ; Rhizome ; chemistry

The opening of laboratories in universities is one of important parts in teaching reform and it is necessary for bringing up high-qualified students.Combined with the practical teaching,we have a primary discussion with the problems of the laborato- ry opening and put forward some suggestions and measures.