Aim The kinetics of nicotinic acetylcholine receptor (N-AChR) was stadied. MethodsThe saturation experiments of Torpedo electric organ N-AChR were taken with125I-?-BuTX. The results were calculated by Scatfit program. Experiments were thenperformed to study the kinetics of dissociation of ?-BuTX and nicotine from N-AChR,respectively. When their binding reached saturation, an excess of 1000 times ?-BuTX ornicotine was added. The saturation binding properties of the N-AChR extracted fromleg muscles of the 13th day chick embroys and optic lobes of the 20th day chick em-broys were studied. The results were calculated by Scatfit program. The othe experi-ments were taken to observe the competition between mcotine and 125I-?-BuTX forbinding with Torpedo, optic lobe and skeletal muscle of the chick N-AChRs. ResultsThe saturation experiments of Torpedo electric organ N-AChR resulted in a Scatchardplot of hyperbola which responded to the model of two kinds of receptor with on eli-gand.The difference of and B max between high affinity binding site and low affnitybineing site was significant. The dissaciation experiment showed that the fast dissocia-tion rate of tow ligands was 500 times more than that of the slow dissociation rate. Thisresult suggested that there may be two subtype N-AChRs.The saturation bindingproperties of N-AChR of leg muscles and optic lobe of the chick embroys revealed aScatchard plot of two kinds of N-AChR indicating a single type of site. The bindingaffinity of receptor of optic lobe was 100 times more than that of muscles. In competi-tion for Torpedo receptor by nicotine and 125I-?-BuTX, the values of IC50 were different:which suggested that two kinds of receptor sites were existent. In competition ofNicotine and 125I-?-BuTX for optic lobe and skeletal muscles of the chick N-AChR, thevalue IC50 of skeletal muscles N-AChR was 7. 7 times higher than that of optic lobe. Itindicated that two kinds of N-AChR subtype existed in the optic lobe and in theskeletal muscles of chick respectively. Conclusion N-AChR of Torpedo electric organcontains two kinds of subtype receptors. N-AChR of optic lobe of chick embroys is onesubtype receptor, and N-AChR of skeletal muscles of chick embroy is another subtypereceptor.

Adult ; Ear Neoplasms ; Eustachian Tube ; pathology ; Humans ; Male ; Teratoma

Adolescent ; Adult ; Child ; Child, Preschool ; China ; epidemiology ; Disease Outbreaks ; Female ; Herbicides ; poisoning ; toxicity ; Humans ; Infant ; Infant, Newborn ; Male ; Middle Aged ; Paraquat ; poisoning ; toxicity ; Risk Factors ; Time Factors ; Young Adult

BACKGROUND: Previous studies suggest that vascular endothelial growth factor 121 may be an optimal target gene for thetreatment of acute myocardial infarction.OBJECTIVE: To investigate effect of direct myocardial injection of adenovirus recombinant human vascular endothelial growthfactor 121 gene (Ad-hVEGF121) on myocardial infracted rat heart structure, function and angiogenesis.METHODS: Totally 78 male SD rats were randomly divided into the sham-surgery (n=18), acute myocardial infarction (n=24),Ad-VEGF121 (n=19) and normal saline (n=17) groups. Among them, left anterior descending coronary arteries of the latter threegroups were ligated to prepare acute myocardial infarction models and rats were randomly selected to receive Ad-hVEGF12 ornormal saline via three points in the cardiac muscle at the 10-15 minutes after ligation. The chest was exposed without ligation inthe sham-surgery group.RESULTS AND CONCLUSION: At 2 weeks after injection, cardiac ultrasound showed that, compared with the sham-surgerygroup, the number of new capillaries, body weight and left ventricular mass / body weight of the acute myocardial infarction,Ad-hVEGF121 and normal saline groups were obviously increased (P < 0.05 or P < 0.01), especially those received transfectedrAd-hVEGF12, had higher density of blood capillaries than those of the normal saline and acute myocardial infarction groups.However, there were no obviously differences between each group in infarct size, cardiac structure or functions. The directmyocardial injection of Ad-VEGF121 can significantly promote the formation of new blood vessels within the myocardium.

Objective To investigate the frequency of Jk(a-b-) phenotype of Kidd blood type system in blood donors of Fujian province and its genetic characteristics.Methods The Jk (a-b-) phenotype in the blood samples obtained from 180 626 donors were screened by using urea lysis assay and the suspected Jk(a-b-) pbenotype individuals were confirmed using conventional serological method.The genomic DNA covering the sequence from exon 1 to exon 11 of JK gene and respective flanking area(50-150 bp),as well as the promoter were amplified by polymerase chain reaction,and the products of PCR were directly sequenced.The genotypes of 7 SNPs of JK gene in the blood samples from 200 blood donors of Fujian province were detected by SNaPshot assay.Results Of 180 626 blood donors,15 cases with Jk(a-b-) phenotype were identified.The genomic analysis for the 15 cases revealed the four recessive JK-null alleles,i.e.,JK*B(IVS5-1G＞A),JK*B(896G＞A),JK*A(130G＞A,220A ＞G) and JK* B(130G ＞A,956C ＞ T) were observed with frequency of 66.67％,23.33％,6.67％ and 3.33％,respectively.SNaPshot results showed the frequency of JK * B (IVS5-1 G ＞ A) was 0.75 ％ and G130A was the common polymorphism.No A220G,C222T,C956T and G896A mutation was found in the 200 blood donors.Conclusion The frequency of Jk (a-b-) blood type in the donors of Fujian population was estimated about 0.008％.JK * B(IVS5-1G ＞ A) and JK * B(896G ＞ A) alleles may be the predominate circulating genes in Fujian population with Jk (a-b-) phenotype.Direct DNA sequencing revealed a novel allele leading to JK-null,SLC14A1 130A,220G.

In view of the predominance problems in present experimental teaching of medical microbiology, we reformed the experimental contents and experimental teaching methods,to establish an entire experimental curriculum teaching system to be suitable for seven-year system and long educational system students,which manifests the creative teaching idea.

BACKGROUD: It is not consistent on whether melatonin correlates with the adolescent idiopathic scoliosis(AIS) demonstrated by the domestic and foreign scholars.OBJECTIVE: To study the pathogenesis of AIS and its correlation with melatonin.DESIGN: A nonrandomized age-matched controlled study screened with two tests.SETTING: The Second Department of Orthopaedics, Haikou People' s Hospital.PARTICIPANTS: The experiment was completed in the Second Department of Orthopaedics, Haikou People' s Hospital. Totally 8 198 in-school students.from over 10 schools of towns in Haifu District, 4 423 males and 3 775 females, aged 7 to 16 years were surveyed.METHODS: Forty-two adolescents who have been diagnosed with AIS were selected and 50 healthy age-matched adolescents were selected as controls. Melatonin was assayed with the radioimmunology and the data were processed statistically.MAIN OUTCOME MEASURES: The levels of serum melatonin in the two groups.RESULTS: The serum melatonin of the preadolescents below 10 years old in AIS group, especially of females, was less than that of adolescents in the control group, with significant differencein statistics.CONCLUSION: The serum melatonin correlates with pathogenesis of AIS.

Objective To validate the analytical performance of three Cys C reagents with particle-enhanced turbidimetric immunoassay(PETIA) method used on the automatic biochemistry analyzer for preliminary clinical application.Methods The performance of three Cys C reagents (labeled as A, B, C) with PETIA method from Shanghai Jing Yuan Co., Beijing Leadman Co. and Beijing Jiuqiang Co. on OlympusAU2700 automatic biochemistry analyzer were assessed.According to the standard of CLSI EP6-A, EP15-A and EP7-P, the precision, linearity range, disturbance (bilirubin, hemoglobin, chyle) were assessed, and compared with those of Cys C reagent based on particle-enhanced nephelometric immunoassay(PENIA) from Dade Behring Co.. The reference ranges for Cys C in serum of 120 healthy individual were evaluated.Results The within-run CVs of the three reagents (A, B and C) were 3.08%-3.2%, 2.3%-4.15% and 1.38%-1.53% respectively.The total CV in A, B and C were 3.29%-3.44%, 2.65%-5.18% and 1.67%-1.69% respectively, lower than the stated.Limits of quantitative determination (LOQ) of the three reagents were 0.41, 0.23 and 0.07 mg/L, basically meeting the testing requirement.The linearity range was 0.22-7.26 mg/L(r=0.996), 0.20-7.72 mg/L(r=0.999)and 0.20-7.62 mg/L(r=0.997)in the three reagents, which demonstrated a sound linear correlation. For interference tests, no remarkable interference (<±10%) of reagent C was detected when bilirubin≤684 μmol/L, hemoglobin≤9.7 g/L and Chyle turbidity≤6 200 FTU; and no significant interference of reagent B was found when bilirubin≤684 μmol/L, hemoglobin≤6.79 g/L and Chyle turbidity≤6 200 FTU; when bilirubin≤684 μmol/L, hemoglobin≤4.85 g/L and Chyle turbidity≤1 240 FTU reagent A was not interfered significantly. The comparison afte and before the high-speed centrifugation reveals that the average percentage of bias for reagents A, B, C measured Cys C in chylous serum samples of patients was -8.31%, 1.52%, 1.32%, respectively.In method comparison tests, the regression equations of the three reagents compared with Dade Behring PENIA Cys C reagent were as follows:Y=0.787X+0.492 (R2=0.976), Y=1.098X+0.137 (R2=0.982) and Y=1.037X+0.249 (R2=0.996), respectively. Agreement rates of the high Cys C in reagent A, B, C and Dade Behring Cys C reagent were 80% (Kappa=0.615,P=0.000), 100% (Kappa=1.000,P=0.000), 91.2% (Kappa=0.824,P=0.000); While for reference range of preliminary clinical assessment, diagnosis coincidence rate of reagent A increased to 98.8% (Kappa=0.974,P=0.000). Conclusions When used in automatic biochemical analyzer, the three Cys C reagent with PETIA showed high precision,sensitivity, and sound correlation with Dade Behring PENIA reagents.The three reagents are all able to meet clinical test requirements, nevertheless, anti-interference capability were diffierent and the reference range should be further validated.

To explore the correlation between the ecological factors and the contents of podophyllotoxin and total lignans in root and rhizome of Sinopodophyllum hexandrum, podophyllotoxin in 87 samples (from 5 provinces) was determined by HPLC and total lignans by UV. A correlation and regression analysis was made by software SPSS 16.0 in combination with ecological factors (terrain, soil and climate). The content determination results showed a great difference between podophyllotoxin and total lignans, attaining 1.001%-6.230% and 5.350%-16.34%, respective. The correlation and regression analysis by SPSS showed a positive linear correlation between their contents, strong positive correlation between their contents, latitude and annual average rainfall within the sampling area, weak negative correlation with pH value and organic material in soil, weaker and stronger positive correlations with soil potassium, weak negative correlation with slope and annual average temperature and weaker positive correlation between the podophyllotoxin content and soil potassium.
Berberidaceae ; chemistry ; China ; Chromatography, High Pressure Liquid ; Climate ; Drugs, Chinese Herbal ; chemistry ; isolation & purification ; Ecosystem ; Lignans ; chemistry ; isolation & purification ; Podophyllotoxin ; chemistry ; isolation & purification ; Soil ; chemistry ; Temperature

Animals ; Arecoline ; pharmacology ; Cholinergic Agonists ; pharmacology ; Female ; Guinea Pigs ; In Vitro Techniques ; Male ; Muscle Contraction ; drug effects ; Muscle, Smooth ; physiology ; Pyloric Antrum ; physiology ; Receptor, Muscarinic M3 ; metabolism