Objective To investigate the effects of cyclooxygenase-2 (COX-2) on the expressions of vascular endothelial growth factor (VEGF) and prostaglandin E_2 (PGE_2) in pancreatic carcinoma both in vitro and in vivo, and to clarify the possible mechanism of PGE_2 in mediating COX-2 inducing angiogenesis of pancreatic carcinoma. Methods In vitro study, the inhibitory effects of Celebrex, a selective cyclooxygenase-2 inhibitor, on the expression of VEGF and PGE_2 in pancreatic carcinoma cell lines PC-3 were determined using either enzyme-linked immuno-absorbent assay (ELISA) or radioimmunoassay (RIA). Effect of exogenous PGE_2 on the down-regulation of VEGF by Celebrex was also assessed. In vivo study, PC-3 cell line xenograft nude mice model was established. Changes of VEGF expression and PGE_2 of tumor tissues after the treatment of Celebrex were investigated using Western blotting or RIA. Results Celebrex suppressed the expressions of VEGF and PGE_2 in cultured PC-3 cell line with a manner of dose- and time-dependence. Exogenous PGE_2 up-regulated the expression of VEGF, which was suppressed by Celebrex in a dose-dependent fashion. In vivo study, administration of Celebrex into xenograft nude mice inhibited expressions of VEGF and PGE_2 significantly. Conclusion COX-2 is involved in angiogenesis in pancreatic carcinoma probably through the inhibition of the production of angiogenic factors such as VEGF. PGE_2 is likely to act as an important mediator in this process.

Objective To investigate the effect of anisodamine on oxygen metabolism and organ function in dogs with sepsis.Methods Twenty beagles were divided into sepsis group (n =8) and anisodamine-treated group (n =12) according to the random number table.The sepsis model was established by cecal ligation and puncture.Changes in thrombomodulin (TM),arterial oxygen partial pressure (PaO2),oxgen uptake rate (ERO2) and lactate were mearsured before and 1,3,8 and 24 h after operation.Wet/dry ratio of lung tissues and incidence of multiorgan dysfunction syndrome (MODS) were detected 24 h after operation.Results Level of TM was increased progressively after operation,which was significantly higher in sepsis group than in anisodamine-treated group at 3,8 and 24 h [(28.7±15.9) vs (19.5 ±10.6)ng/ml,(36.5±20.8) vs (21.9±12.8)ng/ml,(52.6±32.7)vs (31.3 ± 18.4)ng/ml respectively] (P ＜ 0.05).The PaO2 decreased slowly after operation,with the decrease more significant in sepsis group than in anisodamine-treated group at 24 h [(65.6 ± 14.5) vs (83.3 ± 16.3)mmHg] (P ＜0.05).The ERO2 had a rise-and-fall trend after operation,with the level lower in sepsis group than in anisodamine-treated group at 24 h [(16.7 ± 3.1) ％ vs (21.7 ± 2.9) ％] (P ＜ 0.05).Level of blood lactate increased gradually,with the level higher in sepsis group than in anisodamine-treated group at 24 h [(4.4 ± 1.2) vs (3.1 ± 0.8) mmol/L] (P ＜ 0.05).Wet/dry ratio of lung tissues in sepsis group was (510 ± 80) ％ versus (370 ± 50) ％ in anisodamine-treated group at 24 h (P ＜ 0.05).Incidence of MODS in sepsis group was 38％ versus 17％ in anisodamine-treated group at 24 h (P ＜ 0.05).Conclusion Anisodamine may ameliorate the injury to vascular endothelial cells and oxygen metabolism disorder after sepsis and hence contributes to the reduction of sepsis-induced MODS.

Objective:To investigate the cardiac presentations and the possible influencing factors of severe and critical coronavirus disease 2019 (COVID-19).Methods:A retrospective study was conducted. Patients with severe and critical COVID-19 admitted to the Eighth People's Hospital of Guangzhou from January 21st to February 24th 2020 were enrolled. According to the clinical classification, the patients were divided into severe group and critical group. The myocardial injury markers, such as lactate dehydrogenase (LDH), aspartate aminotransferase (AST), creatine kinase (CK), cardiac troponin I (cTnI), myoglobin (MYO), MB isoenzyme of creatine kinase (CK-MB), B-type natriuretic peptide (BNP) and electrocardiogram (ECG) changes were compared between the two groups.Results:A total of 55 COVID-19 patients were selected, including 15 critical cases and 40 severe cases. The patients with severe and critical COVID-19 were male-dominated (61.8%), the average age was (61.2±13.0) years old, 83.6% (46 cases) of them had contact history of Hubei, 38.2% (21 cases) of them were complicated with hypertension. There was no significant difference in baseline data between the critical group and the severe group. Myocardial injury markers of critical and severe COVID-19 patients were increased in different proportion, LDH increased in most patients (20 severe cases and 7 critical cases), followed by AST (16 severe cases and 5 critical cases). There was significant difference in the number of patients with elevated CK between severe group and critical group (cases: 1 vs. 4, P = 0.027). Abnormal ECG was found in 39 of 42 patients with ECG examination. Nonspecific change of T wave was the most common. Before and after treatment, 9 of 15 patients with changes of ECG and myocardial injury markers had oxygenation index less than 100 mmHg (1 mmHg = 0.133 kPa), and the prominent changes of ECG were heart rate increasing and ST-T change. Conclusions:The increase of myocardial injury markers and abnormal ECG were not specific to the myocardial injury of severe and critical COVID-19 patients. At the same time, the dynamic changes of myocardial injury markers and ECG could reflect the situation of myocardial damage.

To study the biological characteristics and mutations of influenza A(H1N1)pdm09 virus isolated from one case of pneumonia of unknown etiology (PUE),which would provide references for clinical treatment and disease control,the throat swab specimen from the PUE case was isolated in the Madin-Darby Canine Kidney (MDCK) cells,and then the antigenicity,pathogenicity and drug resistance of influenza A (H1N1) pdm09 virus were analyzed after sequencing.As a result,one influenza virus strain was isolated from the specimen and named as A/FujianGulou/SWL64/2016(H1N1).The similarities of nucleotide sequences and amino acids sequences compared with the vaccine strain A/California/07/2009 (H1N1) were 96.9％-98.9％ and 96.7％-99.5％,respectively.Eighteen amino acids had mutated in the HA and 4 mutations,K163Q,S185T,S203T and D222N,were involved in 3 different epitopes,which indicated that the antigenic drift had occurred in the influenza virus.The D222N mutation associated with receptor binding site made the virus infect lower respiratory tract more easily.The virus was still amantadine-resistance and oseltamivir-sensitive.In conclusion,the influenza A (H1N1) pdm09 virus in this study have occurred antigenic drift and has the molecular characterization of causing severe pneumonia,so further surveillance should be performed to prevent and control the influenza epidemic.

In order to investigate EV71 antibody levels among general population from Fujian Province after the 2008‐2009 HFMD epidemics ,390 sera‐specimens were collected from 390 participants in 2010 .EV71‐specific antibody was detected by neutralization test ,indicating 186 (47 .69% ) sera of 390 were EV71‐seropositive .Although the difference by gender was not statistically significant on positive rates and antibody titers ,significant differences were observed in positive rates and antibody titers among age groups .The positive rate was increasing with age ,while the 0 age‐group yielded the lowest positive rate of 16 .67% .Subsequently ,significant difference was detected among positive rates and antibody titers between age groups of 0 to 4 years‐old and 5‐years‐old ,with the positive rate of 25 .33% and 61 .67% ,respectively .Therefore ,the EV71 antibody levels among general population from Fujian Province after the 2008‐2009 HFMD epidemics was still in the low level ,especially the age groups of 0 to 4 years‐old .The epidemic of HFMD mainly caused by EV71 will still occur in the future ,and children under 5 years old are major susceptible population ,continuously intensive surveillance ,prevention and control are required .

Using atomic force microscope (AFM), we investigated the images of Pars influenza virus (PIV) under different treatment conditions and observed the different appearances of the virus and its ultra-microstructure from the exterior to the interior. From the 2D images under transmission electron microscope (TEM), we could see that the surfaces of PIV particles exhibited spherical and band-shaped 'tufts'; from the 3D images under AFM, we could further observe the whole spherical virus particles and their detailed surfaces, which exhibited round and band-shaped 'tufts'. Comparing the images under TEM with those under AFM, we found that the latter could reveal the surface topograph and ultramicrostructure of viruses more truly than did the former. The samples of viruses were treated by Tritonx-100, the lipid envelopes of virions were partly or completely resolved, and then most of their capsids were exposed. We could observe the different appearances of the virions under AFM, the lipid envelopes of which were gradually removed. The samples of viruses were also treated by SDS, and the RNA was released from the virions. From the AFM images, we could see the structure of the RNA. It was thus clear that AFM could be used to investigate the different appearances and ultramicrostructure of viruses rapidly and efficiently.
Microscopy, Atomic Force ; Parainfluenza Virus 1, Human ; ultrastructure ; Parainfluenza Virus 2, Human ; ultrastructure

Objective:To establish the risk prediction models for postoperative delirium (POD) in elderly patients undergoing non-cardiac surgery and to evaluate the predictive efficacy.Methods:A total of 685 patients of both sexes, aged 65-90 yr, of American Society of Anesthesiologists (ASA) physical status Ⅰ-Ⅳ, who underwent non-cardiac elective surgery requiring tracheal intubation during general anesthesia in general surgery, orthopedics, urology, hepatobiliary and pancreatic surgery in our hospital from January 2020 to December 2020, were selected.Patients were assigned to the training set and validation set at a ratio of 7∶3 using a simple random sampling method.The clinical data of patients in the perioperative period were collected, and the patients were followed up within 1-7 days after operation (or before discharge), and the occurrence of POD was recorded.Univariate and multivariate logistic regression analysis was used to identify the independent risk factors for POD.The risk prediction model for POD was established based on the results of multivariate logistic regression analysis of the training set, a nomogram and receiver operating characteristic (ROC) curve were drawn, and the area under the curve (AUC) was calculated.The validation set was used to verify the prediction model and assess the efficacy of the risk prediction model for POD.Results:A total of 653 patients were enrolled in this study, 139 patients developed POD, and the incidence was 21.3%.The results of multivariate logistic regression analysis showed that advanced age, high ASA physical status classification, low preoperative Mini-Mental State Examination score, complication with diabetes mellitus, low years of education, high preoperative Pittsburgh Sleep Quality Index scale score, long anesthesia time and high numerical rating scale score after operation were independent risk factors for POD in elderly patients undergoing non-cardiac surgery.The risk prediction model for POD was established based on the independent risk factors mentioned above.The AUC of the training set was 0.981, the Youden index was 0.881, the sensitivity was 95.95%, and the specificity was 92.92%; the AUC of the validation set was 0.939, the Youden index was 0.795, the sensitivity was 94.44%, and the specificity was 85.09%.Conclusion:The risk prediction model for POD established based on age, ASA physical status classification, history of diabetes melittus, years of education, preoperative Mini-Mental State Examination score, preoperative Pittsburgh sleep quality index scale score, anesthesia time and postoperative numerical rating scale score has good predictive efficacy in elderly patients undergoing non-cardiac surgery.

Objective: To analyze the influencing factors and physical and mental development of preschool children with iron deficiency anemia in Dongguan, so as to provide a reference for the prevention of iron deficiency anemia among preschool children. Methods: A total of 118 preschool children with iron deficiency anemia who were examined in Dongguan Maternal and Child Health Center from January 2022 to December 2022 were enrolled in the anemia group, and 118 preschool healthy children who were examined in the hospital at the same time were enrolled in the control group. The physical and mental development of the children were evalucded in both groups. Demographic information and household per capita income were collected. The relationship between risk factors and iron deficiency anemia was analyzed by univariate analysis and multiple Logistic regression. Results: The scores of fine motor skills, gross motor skills, adaptability, social communication, language ability and developmental quotient of children in anemia group were significantly lower than those in control group ( t =4.14, 5.46, 5.60, 5.50, 4.90, 5.83, P <0.01). The difference in scores of adaptability, fine motor skills, gross motor skills language ability, social communication and developmental quotient between the two groups increased with age ( F =390.56, 414.63, 437.35, 409.68, 407.20, 404.54, P < 0.05 ). Multivariate Logistic regression analysis showed that household income, history of past digestive disease, gestational age, maternal anemia during pregnancy, maternal education, consumption of meat, eggs and milk, and intake of nuts were all associated with iron deficiency anemia among preschool children in Dongguan ( OR =2.23，2.99，3.99，3.56，3.11，1.68，1.61, P < 0.05 ). Conclusion The physical and mental development of preschool children with iron deficiency anemia in Dongguan is slower than that of non anemia children of the same age, and the development delay becomes more obvious with increasing age. Attention should be paid to the prevention of iron deficiency anemia among preschool children. It is important to provide reasonable dietary guidance for children with high risk factors such as digestive disease history and prematurity.

Objective: To understand the epidemiological and virological features of influenza B viruses and the difference between the vaccine strains and epidemic strains, the antigenic and genetic characteristics on hemagglutinin (HA) gene of influenza B viruses circulating in Fujian during 2010-2015. Methods: The representative strains were selected randomly according to the lineage of influenza B viruses isolated from network laboratory in Fujian, 2010-2015. Viral RNA was extracted and gene fragments were amplified by reverse transcription polymerase chain reaction (RT-PCR ) and the PCR products were sequenced. The complete HA gene sequence was obtained and analyzed via bioinformatics. Results: Compared to the vaccine strains recommended by WHO, there were significant changes in genetic and antigenic characteristics on HA gene of B Yamagata lineage viruses from 2010 to 2015, especially in 2010, 2014 and 2015. There were major five amino acid residues substitutions (116, 150, 165, 196 and 202) involved in antigenic determinants, and the variable sites gradually increased as time on over. However, the variability of B Victoria lineage viruses on HA gene was less and there was no obvious trend over time. The results showed that the B Yamagata vaccine strains of 2010 and 2015 recommended by WHO had poor protective effect on influenza virus infection, while the B Victoria vaccine strain still play a satisfactory protective effect on humans in Fujian. Conclusions With time on, influenza B Yamagata lineage viruses had gradually mutated, causing a poorly match with vaccine strains in part of year, and emerging antigenic drift phenomenon. Strengthening further surveillance of mutations of B influenza virus remains essential to allow for early warning of influenza epidemic.

Objective To investigate the effect of compound Fufangteng mixture-containing serum on the proliferation of bone marrow mesenchymal stem cell (BMSC) and its mechanism. Methods Rat BMSC were isolated, cultured and purified in vitro by direct adherence method. Cell morphology was observed. Surface markers were identified by flow cytometry. The rats were treated with compound Fufangteng mixture at a dose of 3 mL/(kg·d) by gavage for 14 d, and then the drug-containing serum was collected. BMSC were divided into the blank control group, drug-containing serum group, Notch1 small interfering ribonucleic acid (siRNA) group and Notch1 siRNA+drug-containing serum group. The proliferation rate of BMSC was detected and the relative expression levels of Notch1 signaling pathway-associated messenger ribonucleic acid (mRNA) and proteins were measured in each group. Results Microscopic observation showed that the first generation BMSC were seen in the long spindle shape, and grown in the parallel or spiral pattern. The third generation BMSC positively expressed CD90 and CD44, whereas were negative for CD45. Compared with the blank control group, the proliferation rate of BMSC in the drug-containing serum group and Notch1 siRNA+ drug-containing serum group was significantly increased, whereas that of BMSC was significantly decreased in the Notch1 siRNA group (all P < 0.05). Compared with the Notch1 siRNA group, the proliferation rate of BMSC was significantly increased in the Notch1 siRNA+drug-containing serum group (P < 0.05). Compared with the blank control group, the relative expression levels of Hey1 and Delta-like ligand (DLL)1 mRNA and proteins were significantly up-regulated in the drug-containing serum group, whereas those were significantly down-regulated in the Notch1 siRNA group and Notch1 siRNA+drug-containing serum group (all P < 0.05). Compared with the Notch1 siRNA group, the relative expression levels of Hey1 and DLL1 mRNA and proteins were significantly up-regulated in the Notch1 siRNA+drug-containing serum group (all P < 0.05). Conclusions Compound Fufangteng mixture-containing serum may promote the proliferation of rat BMSC, and its mechanism is probably associated with the activation of Notch1 signaling pathway.