Objective To construct the suppression subtracted cDNA library of deltamethrin-resistant Aedes albopictus. Methods Total RNA was extracted from the deltamethrin-resistant (R-lab) and -sensitive (S-lab) isolates, mRNA was obtained after purification. Double stranded cDNAs were synthesized after reverse transcription. Two subtractions were performed by suppression subtractive hybridization with S-lab as tester and R-lab as driver or S-lab as driver and R-lab as tester. Enriched different expressed cDNA was cloned into pMD18-T vector to construct subtractive libraries. Results The subtracted cDNA libraries contained 580 and 477 positive clones respectively. The PCR results of 150 clones picked randomly from each library showed that the positive ratio of constructed cDNA libraries was 93%, with a length of cDNA fragments ranged from 150 bp to 750 bp. Conclusion The suppression subtracted cDNA library of deltamethrin-resistant Ae. albopictus is constructed.

Objective To compare the biological characteristics of Culex pipiens pallens between permethrin-resistant strain and the susceptible strain. Methods In laboratory, the biological characteristics about bloodsucking, reproduction and development of permethrin-resistant and susceptible strains were observed and recorded. Life table of the experimental populations was constituted. Results The bloodsucking rate of resistant strain was lower than susceptible strain and the difference was significant. The life-span of adults of resistant strain and the developmental duration of eggs, larvae and pupae were longer than susceptible strain and the difference was significant. The death rate of eggs of resistant strain was higher than that of susceptible strain and the difference was significant. The permethrin-resistant strain showed a fitness value of 0 ^58 relative to the susceptible strain. Conclusion The permethrin resistance of Culex pipiens pallens may result in a disadvantage to its reproduction and development.

ObjectiveTo investigate the effect of intensive insulin therapy in critically ill elderly patients.MethodsElderly patients ( ≥ 65 years) admitted to the ICU of Beijing Tongren Hospital from June 2005 to December 2007 were divided into Group A ( glucose control target was 4.4-6.1mmol/L) and Group B ( glucose control target was 7.3-8.3mmol/L).Blood glucose level was controlled with a computer-assisted glucose control protocoL ResultsA total of 639 patients were enrolled,of which 280 were in Group A and 359 in Group B.The mean blood glucose level of the 2 groups was (6.07 ± 0.56) mmol/L and (7.52 ± 0.87 ) mmol/L respectively,both within the target ranges.The hyperglycemic index was (0.69±0.44) mmol/L in Group A and ( 1.60 ±0.73) mmol/L in Group B (P =0.000).No hypoglycemia adverse events occurred in either group.No significant differences were observed in the length of stay in ICU,duration of mechanical ventilation,hospitalization expenses,ICU mortality,and hospital mortality of the 2 groups.ConclusionMaintaining the blood glucose level of critically ill elderly patients at ≤8.3 mmol/L is safe and practical.

Objective:To investigate the relationship of umbilical arterial blood pH with Apgar score and its perinatal influencing factors as well as effects on short-term neonatal outcomes.Methods:This study retrospectively collected the clinical data of 7 183 singleton newborns who were born at ≥35 gestational weeks with umbilical artery blood gas analysis in Peking University Third Hospital from January 2017 to February 2019. All cases were divided into two groups according to their Apgar scores at 1 min: low Apgar group (≤7 scores, n=42) and normal Apgar group (>7 scores, n=7 141). Moreover, according to the pH value of umbilical artery blood they were also allocated into acidosis group (pH<7.2, n=379 ) and normal pH group (pH≥7.2, n=6 804). Independent sample t test, Chi-square test, Fisher's exact test, Pearson's correlation analysis and multivariate logistic regression analysis were used to analyze the correlation between umbilical arterial blood pH and Apgar score, effects of perinatal complications on umbilical arterial blood pH, and influences of acidosis on early neonatal outcomes. Results:The umbilical arterial blood pH in the low Apgar group was significantly lower than that in the normal Apgar group (7.19±0.13 vs 7.32±0.07, t=-6.011, P<0.001). There was a positive correlation between the umbilical arterial blood pH and Apgar score at 1 min ( r=0.217, P<0.001). Fetal distress was an independent risk factor for low Apgar score ( OR=20.553, 95% CI: 4.380-96.443, P<0.001). Premature rupture of membranes was an independent risk factor for acidosis ( OR=1.316, 95% CI: 1.035-1.673, P=0.025). The incidence of low Apgar score [6.33% (24/379) vs 0.26% (18/6 804), χ2=217.075], respiratory distress [6.60% (25/379) vs 2.62% (178/6 804), χ2=21.205] and intracranial hemorrhage [1.06% (4/379) vs 0.04% (3/6 804), Fisher's exact test] was significantly higher in the acidosis group than in the normal pH group (all P<0.001). Conclusions:Neonates with lower umbilical arterial blood pH value should be closely monitored after birth as they are more likely to have respiratory distress and intracranial hemorrhage. Umbilical arterial blood pH value may be effective and is recommended in predicting neonatal early outcome.

Objective:To analyze the factors influencing pH value in umbilical arterial blood gas (UABG) analysis in preterm infants.Methods:A retrospective study was conducted on live singleton preterm infants ( n=573) who received UABG analysis in Peking University Third Hospital from January 2017 to February 2019. Analysis of variance, independent sample t-test, Spearman's or Pearson's correlation analysis, or linear regression analysis was used to analyze the influencing factors. Results:There was no significant difference in UABG pH value between preterm infants of different gestational ages (F=1.74, P=0.077). Spearman's correlation analysis found no correlation between gestational age and UABG pH value in premature infants ( r=0.003, P=0.940), and neither did Pearson's correlation between birth weight and pH value ( r=0.025, P=0.548). UABG pH value in preterm infants was linearly correlated with vaginal delivery ( t=－5.72, P<0.001), gestational hypertension ( t=－3.99, P<0.001) and placental abruption ( t=－4.52, P<0.001). Conclusions:Preterm infants at different gestational ages show a similar pH value in UABG. For those born to mothers with gestational hypertension or placental abruption, when vaginal delivery is pending, close monitoring and full preparation for resuscitation are necessary.

BACKGROUND: Chronic kidney disease is a severe threat to human health with no ideal treatment strategy. Mature mammalian kidneys have a fixed number of nephrons, and regeneration is difficult once they are damaged. For this reason, developing an efficient approach to achieve kidney regeneration is necessary. The technology of the combination of decellularized kidney scaffolds with stem cells has emerged as a new strategy; however, in previous studies, the differentiation of stem cells in decellularized scaffolds was insufficient for functional kidney regeneration, and many problems remain. METHODS: We used 0.5% sodium dodecyl sulfate (SDS) to produce rat kidney decellularized scaffolds, and induce adipose-derived stem cells (ADSCs) into intermediate mesoderm by adding Wnt agonist CHIR99021 and FGF9 in vitro. The characteristics of decellularized scaffolds and intermediate mesoderm induced from adipose–derived stem cells were identified. The scaffolds were recellularized with ADSCs and intermediate mesoderm cells through the renal artery and ureter. After cocultured for 10 days, cells adhesion and differentiation was evaluated. RESULTS: Intermediate mesoderm cells were successfully induced from ADSCs and identified by immunofluorescence and Western blotting assays (OSR1 + , PAX2 +). Immunofluorescence showed that intermediate mesoderm cells differentiated into tubular-like (E-CAD + , GATA3 +) and podocyte-like (WT1 +) cells with higher differentiation efficiency than ADSCs in the decellularized scaffolds. Comparatively, this phenomenon was not observed in induced intermediate mesoderm cells cultured in vitro. CONCLUSION: In this study, we demonstrated that intermediate mesoderm cells could be induced from ADSCs and that they could differentiate well after cocultured with decellularized scaffolds.
Animals ; Blotting, Western ; Fluorescent Antibody Technique ; Humans ; In Vitro Techniques ; Kidney ; Mesoderm ; Nephrons ; Rats ; Regeneration ; Renal Artery ; Renal Insufficiency, Chronic ; Sodium Dodecyl Sulfate ; Stem Cells ; Ureter

OBJECTIVETo monitor and discover medically important mosquito-borne viruses circulating in Xinjiang, China.

METHODSMosquitoes were collected from Abbey Lake wetland in Bortala, in Northern Xinjiang. Viral isolates were obtained through inoculating and serial passaging into susceptible mammalian host cells (BHK-21), identified by cytopathogenic effect (CPE) observation and plague forming assay. Genetic identification of viral isolates was conducted by RT-PCR, sequencing and phylogenetic analysis.

RESULTSA virus strain which causing CPE on BHK-21 cells, was isolated from the predominant Culex modestus (36.6%) and tentatively designated as Abbey Lake virus. Information on molecular identification revealed that Abbey Lake virus belonged to Orthobunyavirus genus within Bunyaviridae. Partial sequences (651 bp and 980 bp) of viral genomic S and M segment showed that Abbey Lake virus was phylogenetically related to Germiston virus that uniquely found in South Africa with 90.6% nucleotides and 95.0% amino acids similarities in S segment. However, viral M segment displayed much variability with 78.6% nucleotides and 86.1% amino acid similarities, suggesting a new member of Orthobunyavirus genus was discovered in the area.

CONCLUSIONIn this study, Abbey Lake virus was isolated and characterized indicating its potential circulation nature of this newly-emerged mosquito-borne virus.

Animals ; China ; Culicidae ; virology ; Orthobunyavirus ; classification ; genetics ; isolation & purification ; Phylogeny ; Sequence Analysis, RNA ; Viral Proteins ; genetics