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Objective To determine the serum IgM and IgG antibody levels post-COVID-19 vaccination， and provide scientific evidence for COVID-19 antibody response after vaccination. Methods A total of 980 healthy persons were included in Kunming Third People’s Hospital from July through August， 2021， which had been vaccinated with COVID-19 vaccines and then tested for anti-SARS-CoV-2 IgM and IgG antibodies. Results After the COVID-19 vaccination， 469 persons （positive rate， 47.86%） were positive for anti-IgG antibody. Of them， 75 were males with （positive rate， 39.06%）， and the average IgG level was 0.618 （0.180， 2.526） AU·mL-1［M（Q1，Q3）］； 394 were females （50.00%）， and the IgG level was 0.999 （0.305， 3.334） AU·mL-1. In addition， 53 persons （5.41%） were anti-IgM antibody positive. Of them， 14 were males （positive rate， 7.29%）， and the average IgM level was 0.057 （0.026， 0.195） AU·mL-1； 39 were females （4.95%）， and the IgM level was 0.047 （0.027， 0.110） AU·mL-1. The positive rate of anti-IgG antibody was highest in those aged ≤30 years， which was 51.02% in male （n=25） and 55.88% in female （n=133）. The anti-IgG response differed significantly by gender （χ2=7.401， D=0.135 1， P<0.05）， whereas the anti-IgM response was not significantly different （χ2=1.656， P>0.05）. Among the age groups， anti-IgG antibody level was higher in those aged ≤30 and 51-70 years， with 158 （55.05%） and 122 （52.36%） persons， respectively； the average antibody level was 1.209 （0.426， 4.386） AU·mL-1 and 1.074 （0.191， 7.670） AU·mL-1， respectively. The differences in the positive rates of IgG and IgM antibodies and the levels of IgG antibodies among different age groups were statistically significant （P<0.05）. Using Kruskal-Wallis test and Spearman correlation analysis， it showed a high correlation between the IgG and IgM antibodies （r=0.836 4， H=64.82， 20.09， P<0.05）. Conclusion The Anti-SARS-CoV-2 IgG antibody remains high six months post-COVID-19 vaccination， while anti-IgM antibody is low. The IgM and IgG response are higher in the young and elderly. The response differs by gender and age， demonstrating a correlation.
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Objective@#To understand the current situation of the lack of knowledge about sexual and reproductive health among female college students, and to provide a reference for conducting feasible and effective interventions to improve their reproductive health.@*Methods@#Female college students from a higher vocational college in Yantai were randomly sampled and questionnaires were conducted before and after the sexual and reproductive health education, 2 153 baseline questionnaires were obtained before intervention. After intervention for half a year, 2 110 valid questionnaires were obtained.@*Results@#After the intervention, female college students’ awareness of normal menstrual cycle, menstrual days, menstrual health knowledge, female ovulation time, ovulation and menstruation significantly improved(P<0.01). The proportion of female college students taking an open attitudes of towards to premarital sex increased, and the number of contraceptives was significantly increased during premarital sex, and the rate reported with the intention of unwanted pregnancies to help parents, friends, and teachers was increased significantly, and the rate of choosing abortion in the illegal clinic decreased significantly (P<0.05). After intervention, students were concerned about contraceptive knowledge, STD prevention, and human flow harm. The cognition was significantly improved(P<0.01).@*Conclusion@#Reproductive health education for female college students can have a good effect and significantly increase the awareness rate of related knowledge.
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Objective To prospectively investigate the effects of high-flow nasal oxygen on hypoxemic patients after surgery.Methods A total of 108 postoperation hypoxemic patients (150 mmHg ≤ PaO2/FiO2 ＜300 mmHg, PaCO2 ≤50 mmHg) in Beijing Hospital Surgical Intensive Critical Unit was in cluded and assigned randomly to two groups from June 2016 to April 2017.Fifty four patients (study group) who received high-flow nasal oxygen therapy were compared with 54 patients (control group) who received noninvasive ventilation therapy.The data of reintubation and mortality in 28 days after extubation were collected and analyzed.Results No significant differences were found for reintubation rate (11.1％ vs 13.0％,P =0.767) and mortality (5.6％ vs 7.4％, P =0.696) in 28 days after extubation between two groups.In subgroup analysis, no significant differences were found for different hypoxima level (250 mmHg ≤ PaO2/FiO2 ＜ 300 mmHg,200 mmHg ≤ PaO2/FiO2 ＜ 250 mmHg and 150 mmHg≤ PaO2/FiO2 ＜ 200 mmHg) between two groups, for reintubation rate (0 vs 3.7％,P =0.296;20％ vs 14.3％,P =0.684;30％ vs 30.8％,P =0.968, respectively) and mortality (0 vs 3.7％,P =0.296;6.7％ vs 7.1％,P =0.960;20％ vs 15.4％,P =0.772, respectively).Face skin breakdown were significantly more common in control group (1 1.1％ vs 0,P =0.012).Conclusions High-flow nasal oxygen therapy was not inferior to noninvasive ventilation for mild and moderate hypoxemic patients after surgery.High-flow nasal oxygen therapy is safe and effective for these patients.
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<p><b>OBJECTIVE</b>To investigate the effect of hydrogen sulfide (H2S) on the proliferation and migration of human colon cancer SW480 cells and explore its molecular mechanisms.</p><p><b>METHODS</b>The proliferation of SW480 cells exposed to different concentrations of NaHS for varying time lengths was analyzed by MTT assay, and the changes in cell migration was evaluated using wound-healing assay. The changes in the expression levels of MMP-2, MMP-9 and SIRT1 protein were detected by Western blotting in the exposed cells.</p><p><b>RESULTS</b>Compared with the control cells, SW480 cells exposed to 50, 100, 200, or 400 µmol/L NaHS for 24, 48 and 72 h all showed increased proliferative activity. NaHS treatment at 100 µmol/L significantly promoted the cell migration (P<0.01) and enhanced the cellular expressions of MMP-2 (P<0.05) and MMP-9 (P<0.01) proteins; NaHS exposure (100 µmol/L) also resulted in up-regulation of SIRT1 expression in SW480 cells.</p><p><b>CONCLUSIONS</b>H2S can promote proliferation and migration of SW480 cells in vitro, the mechanism of which may involve up-regulated expression of SIRT1.</p>
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Humans , Cell Line, Tumor , Cell Movement , Cell Proliferation , Colonic Neoplasms , Pathology , Hydrogen Sulfide , Pharmacology , Sulfides , Pharmacology , Up-RegulationABSTRACT
<p><b>OBJECTIVE</b>To study the different and the variety of four organic acids in leaves of Isatis indigotica among different cultivated populations in water stress condition and healthy plant.</p><p><b>METHOD</b>Four kinds of organic acids, such as oxalic acid, malic acid, ascorbic acid and citric acid from the leaves, were detected by HPLC.</p><p><b>RESULT</b>Significant differences of four organic acids in the leaves of Beijing, Mongolia, Hebei and Shanxi cultivated populations. Compared with the healthy plant, the content of oxalic acid, malic acid and citric acid in water stress were increased, while the content of ascorbic acid was decreased.</p><p><b>CONCLUSION</b>Contents of four organic acids can act as the guideline factor in I. indigotica because they were related with the water stress condition.</p>
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Ascorbic Acid , Chemistry , Metabolism , China , Chromatography, High Pressure Liquid , Citric Acid , Chemistry , Metabolism , Dehydration , Isatis , Chemistry , Metabolism , Malates , Chemistry , Metabolism , Oxalic Acid , Chemistry , Metabolism , Plant Leaves , Chemistry , MetabolismABSTRACT
Objective To determine the content of paeoniflorin with different medicinal parts in Radix Paeoniae Alba and offer a reference for collection and processing. Methods The content of paeoniflorin was measured by HPLC method. Combining air drying with weight relief condition, the content of paeoniflorin was calculated in fresh Radix Paeoniae Alba. Results There was the highest content of paeoniflorin in Radix Paeoniae Alba in 24～48 hours after collection, and the another increasing of the content was founded 120 hours after collection. Conclusion Radix Paeoniae Alba should be processed in 48 hours after collection.
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OBJECTIVE To study the audiological and etiological characteristics of infants failed to pass hearing screening. METHODS 126 infants received audiological diagnostic tests,including auditory brainstem response(ABR),40 Hz auditory event related potential(40 Hz AERP),distortion product otoacoustic emissions(DPOAE),tympanometry and acoustic reflex. The degrees and types of the hearing loss,and etiological characteristics were analyzed. RESULTS Among 126 infants (252 ears),61 were diagnosed with sensorineural hearing loss(48.41%),48 were conductive hearing loss(38.09%),and 17 were found to have normal ABR thresholds(13.49%). The hearing loss was associated with various factors,including history of infection during pregnancy(21 cases),threatened abortion(9 cases),pregnancy with age at or over 35(6 cases),extension of pregnancy(7 cases),history of systematic diseases(10 cases),history of neonatal jaundice(13 cases),history of asphyxia and hypoxia(18 cases),premature and low birth weight neonates(8 cases),neonatal diseases (8 cases),family history of deafness(5 cases),craniofacial deformity(3 cases),central nervous system disorder(6 cases),and 9 cases were second child. CONCLUSION The infants who failed to pass hearing screening have various etiology characteristics in hearing loss. The infants associated with risk factors were mostly found to have sensorineural hearing loss.
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OBJECTIVE To study the causes and mechanism of auditory neuropathy. METHODS Auditory neuropathy is characterized by the DPOAE being normal, the shape of the pure tone loss being mostly in low frequencies, but the ABR being absent or the threshold elevated disproportionally to the pure tone threshold. Patients were screened from the deaf patients through asking the ill history and taking the exams of pure tone audiometry, auditory brain stem response, distortion product of otoaccoustic emissions (DPOAE). Thirty six patients were met the above standard. Deparaffined sections of cochlea of the guinea pigs were used as antigens to test whether the sera of patients had the autoantibodies with immunofluorescence method. RESULTS In the total of 36 patients with this type of hearing loss, autoantibodies were positive in 31 patients(86.1%). Twenty of the 31 patients had autoantibodiesto connective tissue of osseous spiral lamina where the nerve fiber connecting the hair cells and spiral ganglion cells go through. The autoantibodies to capsula surrounding the spiral ganglion and inner ear nerve fiber was also seen in these patients. In additional 7 patients, the autoantibodies to spiral ganglion cell nucleus and inner ear nerve fiber was detected. In the 44 control persons, 9.1% of them have the autoantibodies to inner ear tissues(P
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AIM To study the adaptive cytoprotection of H 2O 2 preconditioning against oxidative stress damage in PC12 cell and the relationships between brain derived neurotrophic factor (BDNF) and the adaptive cytoprotection of H 2O 2 preconditioning. METHODS The viability of PC12 cells was evaluated by MTT assay. Apoptosis was detected by PI stain flow cytometer. Expression of BDNF was analyzed by immuo flow cytometer. RESULTS After H 2O 2 preconditioning, the survival of PC12 cells exposure to H 2O 2 (20～60 ?mol?L -1 ) was increased and the apoptosis of PC12 cells induced by H 2O 2 (20 or 30 ?mol?L -1 ) was inhibited and the expression of BDNF in PC12 cells was enhanced. CONCLUSION H 2O 2 preconditioning is protective against the damage of PC12 cells induced by H 2O 2 and its mechanisms may involve up modulation of the expression of BDNF.
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It is hypothesized that H 2S is the third endogenous signaling gasotransmitter, after NO and CO. Endogenous H 2S may regulate some aspects of synaptic activity via cAMP mediated pathways and function as a neuromodulator or transmitter. H 2S is an endogenous vasorelaxant factor that activates K ATP channels and hyperpolarizes membrane potential of vascular SMCs. By directly acting on vascular SMCs, H 2S may reduce the extracellular calcium entry and relax vascular tissues.
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AIM To study the expression of brain-derived neurotrophic factor (BDNF) in lymphocytes modified by BDNF gene and its effect on the proliferation and the H 2O 2-induced apoptosis of PC12 cells for the transfer of ex vivo therapeutic gene into central nervous system (CNS) tissue with atraumatic means. METHODS Recombined BDNF cDNA plasmid was transfected by LipofectAMINE into the packing cell line PA317 and G418-resistant clones with highest titer was selected. Rat lymphocytes were infected repeatedly with virus supernatant. The expression of BDNF in rat lymphocytes was assayed by FCM and immunohistochemistry. The proliferation of PC12 cells was evaluated by MTT assay. H 2O 2-induced apoptosis of PC12 cells was determined by PI stain flow cytometry. RESULTS BDNF expressed in rat lymphocytes genetically modified and the concentration of BDNF in the conditioned medium of engineered lymphocytes had a linear correlation with the proliferation of the PC12 cells. The supernatant of lymphocytes modified by BDNF gene decreased the apoptosis of PC12 cells induced by H 2O 2. CONCLUSION Rat lymphocytes genetically modified can express and secret active BDNF in vitro.
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AIM: To investigate the effect of neferine (Nef) on human gastric carcinoma cell line with multidrug resistance (MDR). METHODS: The cytotoxic effect of vincristine (VCR) was evaluated by MTT assay. The cell apoptosis induced by VCR was determined by flow cytometry, and the expression of P-glycoprotein (P-gp) and multidrug-resistance-associated protein (MRP) in cells was examined by immunofluorescence flow cytometry. RESULTS: MTT assay showed that Nef at the concentration of 5 ?mol?L~(-1) to 10 ?mol?L~(-1) have no cytotoxicity to parent human gastric carcinoma cell line (SGC7901) and its VCR-resistant variant cell line (SGC7901/VCR). The IC_(50) value of VCR to SGC7901 cell line was 0.06 mg?L~(-1)and that of to SGC7901/VCR cell line was 2.32 mg?L~(-1), which indicated SGC7901/VCR cell line were 39 times more resistant to VCR in comparison with the parent SGC7901 cell line. After treatment with Nef at the concentrations of 2.5, 5 and 10 ?mol?L~(-1), the IC_(50) value of VCR to SGC7901/VCR cell line decreased to 0.34, 0.12 and 0.05 mg?L~(-1), respectively and those increased by 6.8-, 18.1- and 43.8- fold in the chemosensitivity, respectively. Flow cytometry showed that SGC7901/VCR cells were resistant to apoptosis induced by VCR. After 24 h treatment with Nef (2.5, 5 and 10 ?mol?L~(-1)) and VCR, the apoptosis of SGC7901/VCR cells increased, which indicated Nef could abolish resistance of SGC7901/VCR cells to VCR-induced apoptosis. Furthermore, the action of Nef was more potent than verapamil. The expression of P-glycoprotein and multidrug resistance associated protein was strongly positive in SGC7901/VCR cells, and the expression level of P-gp and MRP in SGC701/VCR cells was significantly down-regulated at 24 h after treatment with Nef (10 ?mol?L~(-1)). CONCLUSIONS: Nef can reverse MDR in multidrug-resistant human gastric carcinoma SGC7901/VCR cell line. Its mechanism might be associated with down-regulation of expression of P-gp and MRP in SGC7901/VCR cells.
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Objective To obtain excellent cultivars of Salvia miltiorrhiza cultivated in Jiangsu Province by selective breeding and provide some basic reference for systemic breeding.Methods Tanshinones(tanzhinone Ⅱ_A and cryptotanshinone) and salvianolic acids(salvianolic acid A and B) in the roots of the four cultivars of S.miltiorrhiza were determined by HPLC.The total tanshinones and salvianolic acids were determined by spectrophotometry.Biomasses of four cultivars and correlative analysis between biomasses and effective components were analyzed with Excel and SPSS software.Results Accumulating of biomasses of the four cultivars was coincident incompletely.Contents of total tanshinone,tanshinone Ⅱ_A,cryptotanshinone,salvianolic acid B,danshensu,and total salviandic acids were different.Correlative analysis showed that the relativity between biomasses and contents of effective components of four cultivars were negative correlative.Relativity among liposoluble components was distinct.Correlation coefficients between tanshinone Ⅱ_A and cryptotanshinone of four cultivars were 0.943(ZY),0.942(DY),(0.715)(XY),and 0.960(ZC),respectively.Correlation coefficients between salvialic acid A and B of four cultivars were 0.766(ZY),0.416(DY),0.841(XY),and 0.618(ZC),respectively.But the relativity between hydrosoluble and liposoluble components was not obvious.Accumulating trends of liposoluble and hydrosoluble components were different.Conclusion Contents of total diterpenoids and tanshinon Ⅱ_A in little leaf cultivars are more than the contents of other three cultivars.The qualities of other three cultivars are better than the qualities of S. miltiorrhiza recorded in Chinese Pharmacopoeia.
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AIM To study the synergistic anticancer effccts of neferine combined with anticancer agents on Saos 2 cell lines and its mechanism. METHODS\ Cytotoxicity assay was tested by MTT method.Cell cycle and apoptosis was detected by PI staining flow cytometty. Expression of Rb protein was examined by indirect immune fluorescent symbol flow cytometty and S P immunohistochemical staining. RESULTS\ 5,10 ?mol?L -1 Nef augmented apoptosis of Saos 2 cells induced by ADM,enhanced the expression of Rb protein in Saos 2 cells and raised the G 1 phase ratio of Saos 2 cells. CONCLUSION Nef can promote chemotherapy sensitivity to ADM in Saos 2 cells. Its mechanism is associatd with the up modulation of Rb protein expression in the Saos 2 cells arrest cells in G 1 phase
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AIM To study the effect of neferine on intracellular adriamycin(ADM) accumulation in MCF-7/Adr cell line. METHODS The cytotoxic effect was determined by MTT assay. The intracellular ADM concentration was assayed by HPLC. RESULTS Neferine(Nef) decreased the IC 50 of ADM to MCF-7/Adr cells but increased the intracellular concentration of ADM. CONCLUSION The mechanism of the MDR reversal effect of Nef is associated with the increase of the intracellular accumulation of anticancer drug.
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AIM To investigate the poteintation of adriamycin induced apoptosis by neferine in resistant human breast cancer cell line MCF 7/Adr. METHODS Apoptosis was detected by PI stain flow cytometry and Tunel assay. The intracellular adriamycin (ADR) accumulation was assayed by HPLC and the expression of P gp was determined by flow cytometry. RESULTS (1)MCF 7/Adr cells resisted the apoptosis induced by ADR while Nef augmented ADR medidated apoptosis; (2) Nef (10 ?mol?L -1 ) increased the accumulation of ADR up to 2 88 fold in MCF 7/Adr cells but not in sensitive cells MCF 7/S; (3) Nef(10 ?mol?L -1 ) reduced the expression of P gp in MCF 7/Adr cells. CONCLUSIONS Nef can overcome apoptosis resistance in MCF 7/Adr cells and its mechanisms are involved in the augment of ADR accumulation and the down-modulation of P gp expression in MCF 7/Adr cells.
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AIM To study the protective effect of curcumin (Cur) on PC12 cells damage induced by oxidative stress. METHODS Using H 2O 2-induced PC12 cells damage as the model of neuron damage induced by oxidative stress, the proliferation of PC12 cells was observed by 3-[4,5-dimethylthiazol-2-yl]-2, 5-diphenyltetrazolium bromide(MTT)assay, the apoptosis of PC12 cells was detected by propidium iodide stain flow cytometry (FCM), the mitochondrial membrane potential (△?m) was analyzed by rhodamine123 stain FCM and the level of reactive oxygen species (ROS) in PC12 cells was analyzed by dihydrohodamine123 stain FCM. RESULTS In the presence of Cur (20 and 40 ?mol?L -1), the inhibitory rates of PC12 cells induced by H 2O 2 from 25 to 400 ?mol?L -1 and the apoptosis of PC12 cell induced by 100 and 200 ?mol?L -1 H 2O 2 for 24 h were decreased. The level of △?m was decreased significantly in PC12 cells after 100 and 200 ?mol?L -1 H 2O 2 treatment for 24 h, however, those decreases were significantly ameliorated by Cur (20 and 40 ?mol?L -1) treatment. The level of ROS was significantly increased in PC12 cells exposed to H 2O 2 (100 and 200 ?mol?L -1) for 12 h, whereas 40 ?mol?L -1 of Cur prevented the rise induced by H 2O 2. CONCLUSIONS Cur has protective effect on PC12 cells damage induced by oxidative stress and the effect might be attributed to its removal of ROS and increase of △?m level.
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Aim To study the adaptive protection of H_2O_2 preconditioning against dopamine-induced damage in PC12 cells.Methods The apoptosis of PC12 cells was observed by electron microscope, PI stain flow cytometry (FCM) and Hoechst stain. The mitochondrial energy redox state was measured by MTT assay. The mitochondrial membrane potential(△?m) was investigated by the fluorescent probe of rhodamine 123.Results PC12 cells exposed to 50 ?mol?L -1 DA showed chromatin condensation and nucleus fragmentation observed by electron microscope. Exposure to DA (50 ?mol?L -1) for 24 h, the apoptosis of PC12 cells preconditioned by 10 ?mol?L -1 H_2O_2 for 90 min as measured by Hoechst stain was significantly decreased,compared with no-preconditioned cells. Exposure to 50,100,and 200 ?mol?L -1 H_2O_2 for 24 h, the proportion of apoptosis of PC12 cells was decreased from (20.9?1.8)%, (40.5?6.4)% and (88.1?3.9)% to (4.9?2.9)%, (12.0?1.4)%, (61.5?3.4)% after H_2O_2 preconditioning, respectively. By exposuring PC12 cells to 20,40,and 80 ?mol?L -1 DA for 24 h, the rates of MTT metabolism were reduced and the effect was prevented by H_2O_2 preconditioning. After 50 ?mol?L -1 DA exposure for 24 h,the mean fluorescence intensity of rhodamine 123 in no-preconditioned PC12 cells was decreased from (46.87?0.33) to (4.39?2.93),and that of preconditioned PC12 cells was decreased from (46.87?0.33) to (10.50?0.28). Conclusion H_2O_2 preconditioning possesses adaptive protection against dopamine-induced damage in PC12 cells.