Objective To examine the expression of inhibitory chondroitin sulfate proteoglycans (CSPGs) and in-vestigate their potential effects on neural plasticity in the peri-infarct cortex and ipsilateral thalamus after focal cerebral infarction in hypertensive rats. Methods Twenty-four adult renovascular hypertensive Sprague-Dawley rats per group were subjected to permanent right middle cerebral artery occlusion(MCAO) or sham operation. Twelve rats which were se-lected randomly from per group at each time point were decapitated and their brains were removed and cut into coronal sections at 7 and 14 days post MCAO. The expression of CSPGs, NG2 and Neurocan was examined using immunostaining and western blot. Results All rats displayed neurological deficits to varying degrees and the expression of CSPGs, NG2 and full length Neurocan was increased in the peri-infarct cortex and ipsilateral thalamus at 7 and 14 days (P<0.05). However, there were no significant difference in either expression of CSPGs, NG2 and full-length Neurocan between 7 and 14 days or the expression of C-terminal fragment Neurocan at 7 and 14 days (all P>0.05). Conclusions CSPGs may play a negative role in neural plasticity through induction of inhibitory environment in the peri-infarct cortex and ipsilat-eral thalamus following focal cerebral infarction in hypertensive rats.

Objective To investigate the dynamic levels of autophagy after intimal injury of carotid artery. Meth-ods In this study ,40 male SD rats were randomly assigned to operated(n=20)and control groups(n=20). Balloon inju-ry was induced in the left carotid artery in operated groups .Rats in control groups just received carotid artery exposure without injury. Western blot was used to detect the levels of Beclin-1, LC3 and p62 at the third and seventh days. Immu-nofluorescence was used to examine the expression of Beclin-1 and LC3 at the third and seventh days. Results The ex-pression levels of Beclin-1 and LC3 were increased while the levels of P62 were decreased at the third and seventh days after carotid balloon injury. Beclin-1 and LC3 were present in neointima and medintima. The numbers of both Beclin-1 positive cells and LC3 positive cells were increased at the third and seventh days after carotid injury. The numbers of Be-clin-1 positive cells were 18.60 ± 1.34 in neointima and 6.40 ± 0.55 in medintima at third day, (27.6 ± 2.19 in neointima and 6.40±0.55 in medinitima at the seventh day,(all P=0.000,n=5). The numbers of LC3 positive cells were 10.60±1.52 in neointima and 3.00 ± 0.71 in medintima at third day, (P=0.000,n=5;at the seventh day 21.20 ± 2.49;3.00 ± 0.71,P=0.000,n=5). Conclusions This study domenstrates that autophagy was activated after carotid injury and the chang is dy-namic, which may contribute to neointima formation.

Objective To analyze the association between β2-AK 27 locus genetic polymorphisms and asthma, and the protective effect in airway hyperreactivity. Methods The allel polymerase chain reaction were used to determine β2-AR 27 locus genetic polymorphisms in 149 patients with cough variant asthma who have the airway hyperreactivity. To observe these people for two years in order to know the proportion of changed to typical asthma. And compare with 90 people in healthy group. Results (1) The distribution frequency of β2-AR 27 locus genetic polymorphisms is major in heterozygote (57 % ) , and the Glu/Glu homozygote has the least ( 20% ) , (2) There was a significant decrease in the frequency of Glu/Glu genotype in asthmatics compared with healthy group(9% VS 20% ) ,OR = 0.4(P<0.05) ,95% CI (0.2 ～0. 9) ,but there was no significant difference in the allele frequency of asthmatics compared with healthy group,(3)The frequency of Glu/Glu genotype in severe asthma was lower than stable asthma group(P<0. 05). Conclusion These results suggesteded that β2-AR 27 locus genetic polymorphisms is correlated with asthma,and the Glu27 could have the protective effect to the airway.

Objective: To summarize the clinical characteristics and identify gene mutations of 2 probands with Rubinstein-Taybi syndrome (RSTS). Methods: Clinical characteristics of 2 probands with Rubinstein-Taybi syndrome were summarized. Genomic DNA was extracted from peripheral blood samples from the patients and their parents. Genomic DNA was subjected to whole exome next generation sequencing. Suspected variants were confirmed by Sanger sequencing. Results: The two patients were characterized by typical facial features, broad thumbs and big toes, intellectual disability, and postnatal growth retardation. Two variants of the CREBBP gene, namely c. 3779+ 1G>A and c. 5052_c.5053insT, were respectively identified in the 2 patients. Among these, c. 3779+ 1G>A was a previously known pathological mutation, while c. 5052_c.5053insT was unreported previously. Both variants were predicted to be pathological. Conclusion Two cases of Rubinstein-Taybi syndrome were diagnosed, which facilitated the diagnosis and genetic counselling.

OBJECTIVE: To summarize the clinical characteristics and identify gene mutations of 2 probands with Rubinstein-Taybi syndrome (RSTS). METHODS: Clinical characteristics of 2 probands with Rubinstein-Taybi syndrome were summarized. Genomic DNA was extracted from peripheral blood samples from the patients and their parents. Genomic DNA was subjected to whole exome next generation sequencing. Suspected variants were confirmed by Sanger sequencing. RESULTS: The two patients were characterized by typical facial features, broad thumbs and big toes, intellectual disability, and postnatal growth retardation. Two variants of the CREBBP gene, namely c.3779+1G>A and c.5052_c.5053insT, were respectively identified in the 2 patients. Among these, c.3779+1G>A was a previously known pathological mutation, while c.5052_c.5053insT was unreported previously. Both variants were predicted to be pathological. CONCLUSION Two cases of Rubinstein-Taybi syndrome were diagnosed, which facilitated the diagnosis and genetic counselling.
CREB-Binding Protein ; genetics ; Genetic Testing ; High-Throughput Nucleotide Sequencing ; Humans ; Phenotype ; Rubinstein-Taybi Syndrome ; genetics

Objective In this study, a strain of colistin and tigecycline-resistant bacteria isolated in 2009 was analyzed, and the structure of drug-resistant plasmid and genetic environment were discussed, so as to provide basis for the prevention and control of multidrug-resistant bacteria. Methods A strain (GZ12244) with positive mcr and tet(M) was obtained by screening colistin and tigecycline resistance genes. Vitek-2 was used for strain identification, and the drug sensitivity test was carried out by broth dilution method. The molecular typing, drug resistance genes, insertion sequences, plasmid structure and genetic background were analyzed by genome-wide sequencing and bioinformatics. Results Strain GZ12244 is Klebsiella pneumoniae, which is resistant to colistin B, tigecycline, cefuroxime and tetracycline, and carries a variety of drug-resistant related genes such as mcr-1 and tet(M), and some of the drug-resistant genes with antibiotic efflux and antibiotic target change have amino acid substitution mutations. Mcr-1 and tet(M) coexist in a plasmid, and mcr-1 flanked by two insertion sequences ISApl1. There are insertion sequences such as IS15, IS1D and ISEc63 in the upstream and downstream of tet(M) gene. Conclusion Klebsiella pneumoniae GZ12244 is a multidrug-resistant strain. The drug-resistant gene exists in plasmid, and the mobile elements in upstream and downstream may spread the drug-resistant gene.

Humans ; Infant, Newborn ; Intensive Care Units, Neonatal ; Logistic Models ; Phenotype ; Risk Factors

Objective To explore the research progress, research hotspot and development trend of tigecycline resistance based on the quantitative analysis and visualization function of CiteSpace. Methods The data were collected from 4,263 Chinese and English articles on tigecycline resistance in CNKI, Wanfang, VIP and Web of Science (WOS) databases from 2012 to 2022. CiteSpace 5.8.R3 software was used to analyze the cooperative network of authors, the cooperative network of countries and institutions, the total citation times of journals, and keywords included in the literature, to reveal the hotspots and trends of tigecycline resistance research. Results The number of articles published in English literature was higher than that in Chinese literature. China had the largest number of published documents, showing a significant international academic influence in this research field. Countries all over the world were concerned about the resistance of tigecycline, but Chinese literatures focused more on the clinical infection and prevention of tigecycline resistance, while English literatures placed special emphasis on the research about the drug resistance mechanism of tigecycline. Conclusion The research direction at home and abroad is basically the same, but the research focus has gradually shifted from the clinical treatment and monitoring of tigecycline to the molecular level of drug resistance mechanism.