Objective To investigate the effect of recombinant intestinal trefoil factor(rITF)on the intestinal mucosa of acute necrotizing pancreatitis(ANP)rats and explore the mechanism.Methods 60 male SD rats were randomly divided into control group(n=20),ANP group(n=20),rITF group(n=20).ANP was induced by retrograde injection of 5%sodium taurocholate(100μl/100 g)into biliopancreatic duct.Rats in rITF group were injected with rITF(0.5 mg/100 g)before and after ANP induction.The rats in ANP group and control group received same amount of normal sailne.Each group were sacrificed 12 h or 24 h later.respectively.Blood sample was taken to determine the serum level of amylase.Terminal ileum was resected to observe the pathologic changes;immunohistochemistry method was applied to detect the activity of NF-κB;the expression of TNF-α mRNA,ICAM-1 mRNA in intestinal mucosa was measured by RT-PCR.Results Intestinal injury score of ANP group was higher than that ofcontrol group(P＜0.05),intestinal injury score of ANP 12 h group was higher than that of rITF 12 h group(P＜0.05),but there was no significant difference between ANP 24 h group and rITF 24 h group.The number of positive NF-κB cells was 26±4,55±8,49±4,respectively;the relatively expression of TNF-α mRNA in terminal ileum was 0.050±0.005,1.040±0.031 and 0.792±0.0256,respectively;the relatively expression of ICAM-1 mBNA was 0.045±0.010,0.795±0.037 and 0.400±0.031,respectively,in control group,ANP group and rITF 12 h group.The corresponding values in the ANP group were significantly increased compared with those values in the control group (P＜0.05 or P＜0.01).Conclusions rITF may protect the intestinal mucosa.the mechanism may include inhibit NF-κB activation,down-regulate TiNF-α mBNA,ICAM-1 mRNA expression.

Objective To observe the effects of dexmedetomidine hydrochloride on the cisatracurium-induced neuromuscular blockade in geriatric, young and middle-aged patients. Methods Forty elderly patients and forty young and middle-aged patients undergoing elective abdominal surgery under general anesthesia were randomly divided into 4 groups ( n=20 each):elderly dexmedetomidine hydrochloride group (group DE),elderly control group (group CE),young and middle-aged dexmedetomidine group (group DY) and young and middle-aged control group (group CY).In groups DE and DY,a loading dose of 0.5 μg?kg-1 dexmedetomidine was intravenously infused over 10 min before induction of anesthesia,respectively,followed by infusion at a rate of 0.4μg?kg-1?h-1 until the end of surgery.Equal volume of 0.9% sodium chloride was given in groups CE and CY.Anesthesia was induced with midazolam,fentanyl,propofol and cisatracurium 0.15 mg?kg-1.Four groups were maintained with infusion of propofol and remifentanil. Neuromuscular blockade was maintained with continuous cisatracurium infusion in the four groups and was monitored with TOF-Watch SX acceleromyography at the adductor pollicis.The onset time,TOF no reaction period,duration of action,the amount of cisatracurium consumption,and the spontaneous recovery index ( T1 25% to 75%) were recorded. Results The four groups were comparable in the demographic data.Intubation conditions,the onset time and recovery index were not significantly different among the four groups. The duration of blockade action in groups DE and DY was ( 61. 1 ± 8.9) min and (53.6±9.3) min,which was significantly longer than that in group CE [(49.9±5.8) min] and group CY [(44.8± 6.4) min] (P<0.01).The duration of blockade action was significantly longer in groups DE and CE than in groups DY and CY (P<0.05).The amount of cisatracurium consumption in groups CE and CY was significantly higher than that in groups DE and DY (P<0.05). Conclusion The neuromuscular blockade is longer and the requirement of cisatracurium is less in elderly patients than in young and middle-aged patients.Continuous infusion of dexmedetomidine hydrochloride can't accelerate the onset time of cisatracurium.But duration of action is prolonged and the amount of cisatracurium consumption is lower in patients with infusion of dexmedetomidine hydrochloride.

Objective To investigate the radiosensitization effect of antihelminthic niclosamide on human triple-negative breast cancer MDA-MB-231 cells and the potential mechanism related to Wnt/β-catenin signaling pathway.Methods Four methyl thiazolyl tetrazolium(MTT) assay was used to measure the effect of niclosamide on cell viability at different concentrations and 50％ inhibitory concentration(IC50)value was calculated.MDA-MB-231 cells were divided into 4 groups:untreated control,niclosamide treatment alone group,radiation alone group and niclosamide plus radiation treatment group.The cells with or without 1.0 and 1.5 μmol/L niclosamide pre-treatment were irradiated with 137Cs γ-rays at doses of 0,2,4 and 6 Gy.Cell survival was assayed with the colony formation method,radiation-induced γH2AX foci was analyzed with immunofluorescence,cell cycle progression was assayed with flow cytometry,and the changes of phospho-and non-phospho-β-catenin and Cyclin D1 protein expressions were measured with Western blot.Results Niclosamde obviously inhibited the viability of MDA-MB-231 cells in a dosedependent manner with a IC50 value of 13.63 μmol/L.Pretreatment of cells with 1.0 and 1.5 μmol/L niclosamide evidently enhanced the radiosensitivity of MDA-MB-231 cells to γ-rays,and the values of SER were 1.37 and 1.62,respectively.Niclosamide pretreatment significantly increased radiation-induced γH2AX foci formation(t =3.91,P ＜0.05),diminished the radiation-induced G2/M arrest(t =8.05,P ＜0.01),and inhibited radiation-induced expressions of phospho-β-catenin (S675),non-phospho-β-catenin and Cyclin D1 proteins in MDA-MB-231 cells.Conclusions Niclosamide significantly can enhance the sensitivity of MDA-MB-231 cells to γ-ray irradiation through inhibiting Wnt/β-catenin signaling pathway,which results in the inhibition of DNA DSBs repair and the reduction of radiation-induced G2/M arrest.Wnt/β-catenin signaling pathway may serve as an ideal molecular target for radiosensitization of triplenegative breast cancer.

Objective To investigate the characteristics of repair of DNA double strand breaks (DSB) induced by high-LET α-particle irradiation and their relationship with chromatin structure in the G0 lymphocytes of human peripheral blood,in order to provide the experimental basis for the judgement and dose evaluation of internal α-particle radiation.Methods Peripheral whole blood were collected from four healthy adults and lymphocytes were separated.A monocellular layer of human lymphocytes attached in Mylar film were irradiated with 0 and 0.5 Gy of α-particles and the lymphocytes suspensions were irradiated with 0 and 0.5 Gy of γ-rays.The formations of γH2AX foci as a surrogate marker of DSB and Rad51 foci as a marker of homologous recombination (HR) repair and their spatial localization in chromatin structure were measured by immunofluorescence staining technique at 10 min-48 h post-irradiation.Results Linear-γH2AX foci tracks were observe at 10 min-2 h post-irradiation in lymphocytes exposed to α-particle irradiation(t =11.12,14.40,16.56,P ＜ 0.05),and almost completely disppeared at 6 h postirradiation.The frequencies of γH2AX foci peaked at 30 min after α-particle irradiation (t =51.72,P ＜0.05) and then decreased rapidly during 6 h post-irradiation (t =29.83,P ＜ 0.05).The average number of foci remained only about 16％ at 24-48 h post-irradiation.Moreover,27％ of γH2AX foci located at DAPI-bright heterochromatin region at 10 min after α-particle radiation,suggesting that the efficacy of DSB repair may be decreased.In contrast,at 10 min-48 h after γ-ray irradiation,no linear γH2AX foci track was observed and the γH2AX foci diffused randomly in nucleus and predominantly located in DAPI-weak euchromatin region.The numbers of formative and residual γH2AX foci after γ-ray irradiation were significantly less than those after α-particle radiation.During 30 min-2 h after α-particle and γ-ray irradiation,the frequencies of Rad51 foci slightly but not significantly increased in comparison with background level,and the frequencies of co-localization of Rad51 foci and γH2AX foci were only 3％-8％.Conclusions The formation of linear γH2AX foci tracks induced by high-LET α-particle irradiation in Go human lymphocyte could be used as biological indicator to estimate whether a person has been exposed to internal α-particle radiation.Prolonged persistence of residual γH2AX foci may be applicable for biological dosimetry.

ObjectiveTo investigate the effect of interstitial brachytherapy with 125Ⅰon human esophageal carcinoma implanted in nude mice. MethodsAnimal model simulating human esophageal carcinoma was established by subcutaneous implantation of cultured Eca-109 cell lines into nude mice.The mice were randomly divided into 3 groups,namely control group (saline plus empty seed),125Ⅰ seed group (22.2 MBq×1 seed),and DDP group (cisplatin at the dose of 1 mg/kg),to receive corresponding treatment.The growth rate and the pathological changes of esophageal carcinoma were observed.ResultsThe animals were sacrificed 16 days after irradiation.The average tumor weight in control group,125Ⅰ seed group,and DDP group were (0.20±0.06) g, (0.12±0.03) g and (0.12±0.05 ) g,respectively (P<0.05).Pathological findings included degeneration and necrosis of the tumor cells.Compared to the control group,the necrosis areas in 125Ⅰ seed group and DDP group were significantly larger than those in control (P<0.05).Conclusion125Ⅰ seed brachytherapy in esophageal carcinoma could cause degeneration and necrosis of the tumor cells and had inhibitory effect on tumor growth.

Objective: To study surface landmark of the blood vessles i n subtemporal parapharyngeal region. Methods:6 corpse heads were dissected, the anatomical character and the ralationship between surface landma rks and blood vessels was observed. Results:The distance between inferior medial point of meatus acusticus externus and internal jugular vein fo ramen was (11.5?2.0) mm, that between medial margin of condyle process and in ternal artery foramen was (10.0?1.3) mm. Internal carotid artery was (12.0? 3.0) mm away from posterior margin of mandibular horn, internal jugular vein wa s (5.0?2.0) mm in front of the transverse process of the first cervical verte brae (S1).Conclusions:The inferior point of meatus acustics exte rnus, anterior point of condyle process, mandibular horn and transverse process of S1 can be used as surface landmarks for internol jugular vein and carotid art ery.

Objective To observe the changes of esophageal motility in patients with achalasia (AC) before and after peroral endoscopic myotomy (POEM ) and to evaluate the effects of POEM on esophageal motility in AC .Methods A total of 35 patients with AC received POEM .The esophageal motility in response to different food swallows (5 mL liquid and 2 cm × 2 cm × 2 cm solid food) was evaluated by high-resolution manometry (HRM) system before operation and one month after operation .The changes of parameters of esophageal body and lower esophageal sphincter (LES) were analyzed and compared before and after operation .The t-test ,non-parametric test or single factor analysis of variance was performed for statistical analysis .Results Before POEM operation ,lower esophageal sphincter pressure (LESP) of 35 patients in response to liquid swallows and solid swallows was (28 .94 ± 18 .70) mmHg (1 mmHg=0 .133 kPa) and (26 .41 ± 11 .57) mmHg ,respectively ;after operation it was (16 .02 ± 5 .46) mmHg and (15 .82 ± 5 .04) mmHg ,respectively ;and the differences were statistically significant (t= 4 .338 and 4 .726 ,both P<0 .01) .Before operation ,4 s integrated relax pressure (4 s IRP) during liquid swallows and solid swallows was (27 .18 ± 14 .63) mmHg and (28 .46 ± 11 .15) mmHg ,respectively ;after operation it was (12 .22 ± 6 .75) mmHg and (14 .54 ± 7 .83) mmHg ,respectively ;and the differences were statistically significant (t= 5 .902 and 5 .436 ,both P< 0 .01) .And after operation intra boluspressure (IBP) of liquid swallows and solid swallows also decreased compared to that before operation (t=5 .075 and 2 .944 ,both P< 0 .01) .Lower esophageal sphincter relaxation rate (LESRR) during liquid swallows and solid swallows increased compared to that before operation (t= -2 .990 , P< 0 .01 ;t=-0 .340 ,P>0 .05) .There was no difference in the distal contractile integral (DCI) and distal esophageal peristaltic amplitude in subtype Ⅰ and Ⅲ patients before and after operation (all P>0 .05 ) .All those parameters decreased in subtype Ⅱ patients (Z= -2 .704 and -2 .489 ,P< 0 .05 ;Z= -1 .929 and-0 .747 , P> 0 .05 ) . Proximal esophageal peristalsis was observed in two patients after operation , however there was no integrated esophageal body peristalsis .Clinical symptoms quickly relieved in all patients after POEM operation and clinical score significantly decreased compared to that before operation (0 .86 ± 1 .19 vs 8 .16 ± 1 .84 ,t=20 .605 , P<0 .05) .Conclusions POEM can effectively relieve LES relaxation disorder in AC patients and improve esophageal body peristalsis to a certain degree .The efficacy is regardless of AC types ,and further studies are need to shed light on the long-term efficacy .The long-term efficacy still need further follow-up study .

Objective To observe the effect of ultrasound-guided transversus abdominis plane blockon median effective dose of sufentanil in pediatric postoperative analgesia. Methods Forty-fivepediatric patients under-going elective hernia repairsurgery were randomly divided into two groups:group Rop and group Sal. Ultrasound-guided transversus abdominis plane blocks were performed on both groups after general anesthesia induction before the start of surgery. Group Rop received 0.3 mL/kg of 0.25%ropivacaine,and group Sal received 0.3 mL/kg of 0.9%saline. Patient controlled intravenous analgesia pump within sufentanil was used in both groups after operation. Used the sequential method to determine the median effective dose of sufentanil ,recorded the times of the pressing self-control analgesia within 6h after operation,the use of sufentanil,postoperative pediatric pain(FLACC)score and adverse reactions. Results 1. The median effective dose of sufentanil in group Rop was lower than group Sal (0.0259 μg/(kg · h)vs 0.0379 μg/(kg · h)). 2.The times of the pressing self-control analgesia within 6 h after operation and the use of sufentanil in group Rop were less than in group Sal. 3.The postoperative FLACC score at different points in group Rop was lower than in group Sal(P < 0.05). 4.There were no significant difference(P >0.05)in incidence of adverse reactions in both groups. Conclusion The ultrasound-guided transversus abdominis plane block in pediatric lower abdominal surgery can effectively reduce the median effective dose of sufentanil.

To investigate whether a conserved sequence of the human papillomavirus(HPV) L1 protein consisted of 12 amino acid residue can induce the antibody aimed at multiple HPV types, we screened a conserved sequence of the HPV L1 protein by forecasting B cell epitope and comparing multiple sequences. The peptide was synthesized, mixed with Freund adjuvant, and used to immunize rabbits, and those in the control group were only immunized with Freund adjuvant. Then the antibody titer was identified by indirect enzyme-linked immunosorbent assay (ELISA). And immunocytochemistry, immunofluorescence, western blot and immunohistochemistry were used to detect whether the antibody could react with cervical cancer cell lines and cervical tissue that had been identified with HPV infections. We found that the antibody titer was greater than 1:25600. Moreover, we confirmed that the antibody could react with cervical cancer cell lines and cervical tissue with HPV infections. The results showed that the peptide could induce antibody aimed at multiple HPV types. Our findings have great significance in further research of the broad spectrum HPV, HPV L1 diagnosis kits.
Animals ; Antibodies, Viral ; immunology ; B-Lymphocytes ; immunology ; Capsid Proteins ; classification ; immunology ; Computer Simulation ; Epitopes ; immunology ; Female ; HeLa Cells ; Humans ; Oncogene Proteins, Viral ; classification ; immunology ; Papillomaviridae ; immunology ; Papillomavirus Infections ; immunology ; Rabbits ; Viral Proteins ; immunology

Objective: To investigate the levels of lanthanum, cerium, praseodymium, and neodymium in the blood, urine, and hair samples from residents in the rare earth mining area of a city in China, and to provide a scientific basis for the control of rare earth pollution and the protection of population health. Methods: A total of 147 residents who had lived in the rare earth mining area of a city for a long time were selected as the exposure group, and 108 residents in Guyang County of this city who lived 91 km away from the rare earth mining area were selected as the control group. Blood, urine, and hair samples were collected from the residents in both groups. Inductively coupled plasma mass spectrometry was used to determine the content of lanthanum, cerium, praseodymium, and neodymium in blood, urine, and hair samples. Results: In the exposure group, the median levels of lanthanum, cerium, praseodymium, and neodymium were 0.854, 1.724, 0.132, and 0.839 μg/L, respectively, in blood samples, 0.420, 0.920, 0.055, and 0.337 μg/L, respectively, in urine samples, and 0.052, 0.106, 0.012, and 0.045 μg/g, respectively, in hair samples. The exposure group had significantly higher levels of the four rare earth elements in blood, urine, and hair samples than the control group (P<0.01) . Conclusion The residents in the rare earth mining area of this city have higher content of lanthanum, cerium, praseodymium, and neodymium in blood, urine, and hair than those in the non-mining area; the content of cerium is highest, followed by lanthanum, neodymium, and praseodymium.