Objective To study the changes of mRNA expression of heat shock protein 70 (HSP70) in the rat brain exposed to repeated +Gz. Method The mRNA expression levels of HSP70 in rat brain were measured by semi-quantitative reverse transcription polymerase chain reaction (RT-PCR). Result The HSP70 mRNA expression levels in rat brains taken 30 min and 6 h after repeated +Gz exposures were significantly higher than those in control group, while the difference between the levels of control group and those of experimental rat brains taken 24 h after +Gz exposure was not significant. Conclusion It is suggested that HSP70 mRNA expression in rat brain can be induced by repeated +Gz exposures and the increased HSP70 mRNA expression may play an important role in self-protection against brain damage induced by+Gz exposures.

Objective To establish a high throughput phenotypic test for the detection of drug re-sistance in human immunodeficiency virus(HIV)strains. Methods The gene encoding luciferase was in-activated through restriction enzyme digestion and ligation. LacZ gene was used to replace the genes encoding original protease and reverse transcriptase. pol genes were amplified from pSG3△env plasmid and cloned in-to a new backbone plasmid through infusion. The factors that might affect the results of the test were opti-mized. Results The parental backbone plasmid pNL4-3. Lac was constructed,of which the gene encoding luciferase was inactivated and bearing the LacZ gene instead of genes encoding protease and reverse tran-scriptase. Several influential factors including cell numbers(10 000 / well),virus inoculation(200 TCID50 /well)and the concentration of DEAE-dextran(15 μg/ ml)were optimized. The reproducibility of this test was confirmed by testing 12 anti-HIV drugs against 2 pseudovirus strains 8 times,presenting the coefficient of variations(CVs)from 4. 32% to 28. 46% . Six types of pseudovirus were constructed and tested against the 12 anti-HIV drugs,the results of which were compared with those by using the pSG3△env-based pseud-ovirus test. The results of the two tests presented good consistency. Conclusion The high throughput phe-notypic test based on pNL4-3. Lac plasmid,combining the advantages of pSG3△env and pNL4-3 systems, could be used to analyze the drug resistance patterns of HIV-1 infectors and screen new drugs for antiretrovi-ral therapy in a rapid and effective way.

Objective To evaluate the efficiency of multimodal analgesia for the patients who had the posterior lumbar spine surgery.Methods Sixty-four cases of patients who were scheduled to the posterior lumbar spine surgery were randomly divided into two groups, multimodal analgesia group (n =32) and control group(n=32).Multimodal analgesia group patients were given oxycodone acetaminophen 1 day before and the next day after operation, during the operation the patients received injiection of multimodal drugs (consisting of ropivacaine 150 mg, flurbiprofen 50 mg, phenylephrine 0.4 ml, normal saline 50 ml) around the incisions by infiltrated injection before the skin incision closed, then had controlled intravenous analgesia.In the control group, the incisions were sutured without the local infiltration analgesia.Then only had patient controlled intravenous analgesia after operati on.Visual analogue scale(VAS) ,Japanese Orthopedic Association(JOA) and Prolo lumbar function score was recorded respectively perioperatively.Results (1) VAS: the patients of multimodal analgesia group had significantly lower rest pain scores and activity pain scores at 6, 12,24 hours, first moving than the control group((3.1±1.6) ,(2.8±1.1),(2.4±0.9) ,(2.3±1.1) vs.(3.5±1.8) ,(3.4± 1.3), (3.4±0.8), (3.0± 1.5), P＜0.05).There was no significant difference at the discharge between the two groups (P＞0.05).(2)JOA:JOA scores of the patients of multimodal analgesia group were obviously higher than that of the control group at 1,3,7 days after operation (P＜0.05).There was no significant difference at the discharge between the two groups (P＞0.05).(3) Prolo lumbar function score : Prolo scores of the patients of the multimodal analgesia group were obviously higher than that of control group at 1,3,7 days after operation (P ＜0.05).There was no significant difference at the discharge between the two groups(P＞0.05).Conclusion Multimodal Analgesia is shown to safely provide excellent pain control and functional recovery.It can reduce visual analogue pain score and improve lumbar function after surgery.

Objective: Based on the nature, location and size of parotid tumor, different incisions were chosen and method of selecting the best cosmetic incision for parotid gland tumor operation would be discussed. Methods: 33 cases of parotid benign tumor patients that received by Department of Oral and Maxillofacial surgery of First Affiliated Hospital of Nanchang University during 2015-2017 were included in this study. According to the size of the tumor location, different incisions, mainly pretragal vertical, pretragal crutch and rhytidectomy incision were selected. The facial nerve and the great auricular nerve were protected during the operation. In 1-month and 3-month follow-up, clinical examination of temporary facial paralysis, salivary fistula, especially the cosmetic outcome after the surgery were evaluated. Results: The satisfaction rate of parotid cosmetic incision was significantly higher than that of the traditional group, the incidence of transient facial paralysis, salivary fistula was not statistically significant compared with the traditional incision. Conclusions According to the location of parotid tumor, we should choose the proper cosmetic incision approach, which is better than the traditional surgical incision.

Objective To explore the association between iron metabolism indexes and the risk of gestational diabetes mellitus(GDM)in pregnant women with advanced age.Methods A total of 292 pregnant women,whose age were≥35 years old and gave birth in Taicang First People's Hospital from April 2021 to April 2023,were retrospectively included and divided into GDM group and non-GDM group.The differences of iron metabolism indexes[serum ferritin(SF),serum iron(SI)and hemoglobin(Hb)]measured from the 20 to 24 weeks of gestation were compared between the two groups.Multivariable Logistic regression model was used to explore the association of SF,SI and Hb with GDM.Based on the data of single nucleotide polymorphism from IEU OpenGWAS(http://gwas.mr-cieu.ac.uk/)and FinnGen datasets,two samples Mendelian randomization analysis were conducted to explore the causal relationship between iron metabolism indexes and GDM by using the methods of Inverse Variance Weighted(IVW).Results In the maximally ad-justed multi-factor logistic models,the statistically significant association between SF measured from 20 to 24 weeks of gestation and the risk of GDM was found[odds ratio(95％confident interval)=1.02(1.01-1.04),P=0.001].The association between Hb and GDM was marginally significant[odds ratio(95％confident interval)=1.04(1.00-1.07),P=0.044],but no association between SI and GDM reached statistical significance.However,Mendelian randomization analysis showed there was no significant evidence for causal association between SF,Hb and GDM.Conclusion SF examined at 20 to 24 weeks of gestation could be used as a biomarker of GDM in the pregnant women with advanced age,but no evidence supported the causal association between SF and GDM.

Objective:To analyze the neutralization properties of different genotypes and mutants of severe fever with thrombocytopenia syndrome virus (SFTSV).Methods:Pseudoviruses of SFTSV of different genotypes and mutants were constructed using VSVΔG-Fluc*G backbone. Neutralization assays were established based on the pseudoviruses. DNA vaccines for different SFTSV genotypes were prepared. Serum samples were collected from guinea pigs immunized with the DNA vaccines. Neutralizing antibodies in serum samples from immunized guinea pigs and naturally infected patients were detected using neutralization assays and analyzed.Results:The pseudoviruses of five genotypes and 43 mutants were successfully constructed and the neutralization assays based the pseudoviruses were successfully established after optimizing the reaction parameters. The dilution multiple corresponding to the inhibition rate of neutralizing antibody to half of the pseudovirus infection was taken as the titer of neutralizing antibody by the reduction in pseudovirus reporter gene. The neutralization antibody titers in naturally infected patients and immunized guinea pigs were respectively in the ranges of 1∶100-1∶43 000 and 1∶100-1∶2 500 when detected with the reference HB29 pseudovirus. The neutralization antibody titers ranged from 1∶100-1∶2 500 after immunization with different genotypes of DNA vaccines. No significant statistical difference in neutralization antibody titer was observed among different genotypes or mutant strains.Conclusions:The neutralization properties of different genotypes and mutants showed no significant change, which would be very useful for developing vaccines.