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One of the characteristics of coronavirus disease 2019 (COVID-19) epidemiology is that asymptomatic infection is also a source of infection. There was no fever and/or respiratory symptoms in this patient before the operation, and the results of routine blood test showed decreased lymphocyte count and lymphocyte percentage, and novel coronavirus pathogen detection was not carried out in the hospital, and the detection was not performed, chest imaging examination showed no obvious ground glass shadow, so viral pneumonia was not considered. The medical staff involved in the operation all adopted standard secondary medical protection measures. Five days after the operation, the patient was tested positive for novel coronavirus nucleic acid, which was a confirmed case of COVID-19. The results of epidemiological investigation and analysis showed that the patient was in the incubation period of COVID-19 before operation, however, none of the medical staff involved in surgical anesthesia and none of the patients in the next operation were infected. The reason is that the author′s hospital has strict training for all staff in infection control, and surgical anesthesiology medical staff have mastered the relevant basic knowledge and operation skills, have a good sense of infection control in the operating room, and can standardize the implementation. This case also suggested that attention should be paid to the patients with significant preoperative simple lymphocyte level decline, and measures should be taken to identify asymptomatic infection early.
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Objective@#To evaluate the effectiveness on informational support of the parenting sense of competence and parenting stress in primiparas.@*Methods@#Ninety-five primiparas in the First Affiliated Hospital of Zhengzhou University were recruited from November 2017 to April 2018, mothers of premature infants discharged from hospital from November 2017 to January 2018 were divided into the control group,and which discharged from February 2018 to April 2018 were divided into the experimental group conveniently.Seven cases in the control group and 5 cases in the experimental group dropped out. The control group received routine nursing care, 4 times of informational support were implemented to the mothers of premature infants at the first 4 months after discharged in the experimental group,included team teaching, live demonstration, set up a wechat group, et al. All primiparas were investigated using the Chinese version of Parenting Sense of Competence Scale(C-PSOC) and the Parenting Stress Index-Short Form(PSI-SF) at the 1th,3th,6th month postpartum.@*Results@#At the 6th month postpartum, total scores of the Chinese version of Parenting Sense of Competence Scale and subscale scores of self-efficacy, satisfaction of the mothers of premature infants were 82.60±4.45, 39.19±3.25, 43.40±3.47, respectively in the experimental group,and the scores were 76.83±7.88, 36.90±4.82, 39.93±5.16, respectively in the control group, the difference between the two groups was statistically significant(t=4.117, 2.541, 3.613, P<0.05). At the 6th month postpartum,total scores of the Parenting Stress Index-Short Form and subscale scores of parenting distress,parent-child dysfunctional interaction,difficult child of the mothers of premature infants were 80.31±9.50, 28.62±4.54, 23.98±4.91, 26.14±5.15, respectively in the experimental group,and the scores were 87.36±8.58, 32.55±4.88, 25.95±4.15, 28.84±4.88, respectively in the control group,the difference between the two groups was statistically significant(t=-3.568-3.823, P<0.05).@*Conclusions@#Informational support can effectively improve the parenting sense of competence and relieve the parenting stress in primiparas.
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Objective To investigate the risk factors for postoperative cognitive dysfunction (POCD)after gynecologic laparoscopic surgery in elderly female patients,and to establish a risk model for prognosis.Methods Mini-Mental State Examination(MMSE) was used to evaluate the cognitive function of 280 elderly women who underwent gynecologic laparoscopic surgery from April 2014 to March 2016 in four tertiary-level hospitals in Hubei Province.Thirty-two cases were excluded due to withdrawal or loss of follow-up,and 248 cases with complete and valid data were collected for analysis.According to the degree of cognitive impairment on the 7th day after operation,subjects were grouped into a POCD group and a non-POCD group.Logistic regression was used to determine risk factors and establish a prognostic model for POCD.Results Of the 248 subjects enrolled,62 (25.0％) were diagnosed with POCD on the 7th day after operation.Multivariate Logistic regression analysis showed that American Society of Anesthesiologists(ASA) grade(OR =4.578,95％CI:1.156 ～18.139,P =0.030),age (OR =1.465,95％ CI:1.230 ～ 1.745,P =0.000),and duration of anesthesia(OR =1.030,95 ％ CI:1.005 ～ 1.056,P =0.017) were independent risk factors for POCD,and intraoperative administration of dexmedetomidine (OR =0.069,95 ％ CI:0.508 ～ 14.094,P =0.011),dexamethasone (OR =0.135,95 ％ CI:0.200 ～ 0.928,P =0.042),and maintenance of deep anesthesia(OR =0.761,95 ％ CI:0.630 to 0.919,P =0.005) were protective factors.A prognostic model was established based on the principle of logistic regression equation.The receiver operating characteristic(ROC)curve determined Y=4.291 as the best risk value,and the expected sensitivity and specificity were 90.3％ and 97.8％,respectively.Additionally,another 50 independent cases were included to verify the predictive efficacy of the model.It showed that the overall correct rate was 86.0％,and the sensitivity and specificity were 81.8％ and 87.2％,respectively.Conclusions Increased ASA grade,advanced age,prolonged anesthesia time are independent risk factors for POCD,and intraoperative administration of dexmedetomidine,dexamethasone,maintenance of deep anesthesia play a protective role.The prognosis model of POCD has certain clinical value.
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Objective To evaluate the effectiveness on informational support of the parenting sense of competence and parenting stress in primiparas. Methods Ninety-five primiparas in the First Affiliated Hospital of Zhengzhou University were recruited from November 2017 to April 2018, mothers of premature infants discharged from hospital from November 2017 to January 2018 were divided into the control group,and which discharged from February 2018 to April 2018 were divided into the experimental group conveniently.Seven cases in the control group and 5 cases in the experimental group dropped out. The control group received routine nursing care, 4 times of informational support were implemented to the mothers of premature infants at the first 4 months after discharged in the experimental group,included team teaching, live demonstration, set up a wechat group, et al. All primiparas were investigated using the Chinese version of Parenting Sense of Competence Scale(C-PSOC) and the Parenting Stress Index-Short Form(PSI-SF) at the 1th,3th,6th month postpartum. Results At the 6th month postpartum, total scores of the Chinese version of Parenting Sense of Competence Scale and subscale scores of self-efficacy, satisfaction of the mothers of premature infants were 82.60 ± 4.45, 39.19 ± 3.25, 43.40 ± 3.47, respectively in the experimental group,and the scores were 76.83 ± 7.88, 36.90 ± 4.82, 39.93 ± 5.16, respectively in the control group, the difference between the two groups was statistically significant(t=4.117, 2.541, 3.613, P<0.05). At the 6th month postpartum,total scores of the Parenting Stress Index-Short Form and subscale scores of parenting distress,parent-child dysfunctional interaction,difficult child of the mothers of premature infants were 80.31 ± 9.50, 28.62 ± 4.54, 23.98 ± 4.91, 26.14 ± 5.15, respectively in the experimental group,and the scores were 87.36 ± 8.58, 32.55 ± 4.88, 25.95 ± 4.15, 28.84 ± 4.88, respectively in the control group,the difference between the two groups was statistically significant(t=-3.568-3.823, P<0.05). Conclusions Informational support can effectively improve the parenting sense of competence and relieve the parenting stress in primiparas.
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Objective To explore the effect of PDCA [plan (P), design (D), check (C), act (A)] cycle on primary cardiopulmonary resuscitation (CPR) training for medical assistants in hospitals. Methods PDCA cycle was used to enhance continuous quality improvement (CQI) of team members to carry out brain storming to find out the root causes of the training difficulty, and directing to the 3 main root causes: lack of emergency rescue consciousness, without systematic training system and improper education procedure, it was proposed to arrange 3 great strategies: emergency rescue knowledge training, design of systematic training system and proper arrangement of training process. The changes of medical assistants' subjective willingness to perform the first aid, the accurate rates of answering questions on CPR location, frequency, depth, ratio of compression to breathing and awareness degree of CPR before and after training were observed. Results After training, the medical assistants' subjective willingness to perform the first aid was higher than that before training [91.7% (121/132) vs. 2.3% (3/132), P＜0.05]. The accurate answer rates on questions concerning CPR basic knowledge, such as location, frequency, depth and compression-breathing ratio had been greatly improved after training compared with those before training [location: 65.2% (86/132) vs. 4.5% (6/132), frequency: 40.2% (53/132) vs. 0 (0/132), depth: 90.2% (119/132) vs. 0 (0/132), compression-breathing ratio: 84.8% (112/132) vs. 1.5% (2/132 ), all P＜0.05]. After training, the percentage of medical assistants having very familiar awareness degree of CPR was significantly higher than that before training [65.2% (86/132) vs. 3.0% (4/132), P＜0.05]. Conclusion Via CPR training PDCA cycle, not only the efficiency of CPR training management is greatly improved, but also the training effect of participants is significantly elevated.
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Objective To evaluate the effect of dexmedimidine on intestinal injury in rats with endotoxemia.Methods Twenty-four healthy adult male Sprague-Dawley rats,aged 2-3 months,weighing 200-250 g,were divided into 4 groups (n =6 each) using a random number table method:control group (group C),endotoxemia group (group E),dexmedimidine group (group D) and dexmedimidine plus α7 subunit-containing nicotinic acetylcholine receptor antagonist group (D +α-BGT group).The endotoxemia model was established by injecting lipopolysaccharide (LPS) 10 mg/kg via the femoral vein.Dexmedetomidine 40 μg/kg was injected and 15 min later LPS was intravenously injected in group D.Dexmedetomidine 40 μg/kg was intraperitoneally injected after intraperitoneal injection of α-bungarotoxin 1 μg/kg,and 15 min later LPS was intravenously injected in group D+o-BGT.Blood samples were collected from the abdominal aorta at 6 h after LPS injection for determination of the plasma interleukin-6 (IL-6) and tumor necrosis factor-alpha (TNF-α) concentrations (by enzyme-linked immunosorbent assay).Rats were sacrificed after blood sampling,and intestinal tissues were obtained for examination of the pathological changes and for determination of the myeloperoxidase (MPO) activity (by chemical colorimetry) and expression of NF-κB p65 in nucleoprotein (by Western blot).Results Compared with group C,the plasma IL-6 and TNF-o concentrations and MPO activity in intestinal tissues were significantly increased,and the expression of NF-κB p65 in nucleoprotein was up-regulated in the other 3 groups (P＜0.05).Compared with group E,the plasma IL-6 and TNF-α concentrations and MPO activity in intestinal tissues were significantly decreased,the expression of NF-κB p65 in nucleoprotein was down-regulated (p＜0.05),and the pathological changes of intestinal tissues were significantly attenuated in group D.Compared with group D,the plasma IL-6 and TNF-α concentrations and MPO activity in intestinal tissues were significantly increased,the expression of NF-κB p65 in nucleoprotein was up-regulated (P＜0.05),and the pathological changes of intestinal tissues were accentuated in group D+α-BGT.Conclusion Dexmedetomidine can reduce the intestinal injury in rats with endotoxemia,and the mechanism may be related to activating cholinergic anti-inflammatory pathway and further inhibiting inflammatory responses.
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Objective To evaluate the effect of oxycodone on microglial activation in brain tissues of rats. Methods Primarily cultured microglial cells of Sprague?Dawley rats were seeded in 24?well plates (1 ml∕well)at a density of 1×105cells∕ml and divided into 5 groups(n=40 each)using a random num?ber table: control group(group C), lipopolysaccharide(LPS)group(group L)and low, medium and high concentrations of oxycodone groups(O25, O50, O100groups). The cells were cultured in serum?free medium for 24 h in group C. LPS was added at the final concentration of 1 μg∕ml in L, O25, O50and O100 groups, and in addition oxycodone was added at the final concentration of 25, 50 and 100 ng∕ml at 24 h of incubation with LPS in O25, O50and O100groups, respectively. Cells were collected at 1 h of incubation or culture for determination of the expression of tumor necrosis factor?α(TNF?α), interleukin?1β(IL?1β), IL?10 and transforming growth factor?1β(TGF?1β)mRNA(by real?time polymerase chain reaction)and expression of TGF?1β and phosphorylated Smad2(p?Smad2)(using Western blot). The concentrations of TNF?α, IL?1β and IL?10 in the supernatant were detected by enzyme?linked immunosorbent assay. Results Compared with group C, the expression of TGF?β1, IL?1β and TNF?α mRNA, TGF?β1 and p?Smad2 was significantly up?regulated, and the concentrations of IL?1β, IL?10 and TNF?α in the supernatant were increased in group L(P<0.01). Compared with group L, the expression of TGF?β1, IL?1β and TNF?α mRNA, TGF?β1 and p?Smad2 was significantly down?regulated in O50and O100groups, the expression of IL?10 mRNA was significantly up?regulated, and the concentrations of IL?1β and TNF?α in the supernatant were decreased in group O100(P<0.05), and no significant change was found in the parameters mentioned above in group O25(P>0.05). Conclusion Oxycodone can inhibit microglial activation in brain tissues of rats.
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Objective To determine the value of using B-type natriuretic peptide (BNP) and D-dimer in preliminary recognition of cardioembolic stroke patients.Methods A mutilple-center study was conducted in Foshan Hospital of traditional Chinese Medicine (TCM) and its affiliated hospitals from July 2015 to July 2016.In the emergency departments (EDs),emergency physicians prospectively assessed consecutive adult patients with acute cardioembolic stroke and measured plasma BNP by POCT platform on admission,then followed up.Stroke neurologists evaluated patients' functional outcome at hospital discharge and also made discharge diagnosis and stroke etiologic subtypes according to the TOAST criteria.Results In this study,290 acute ischemic stroke patients met the study criteria [mean age (68.41 ± 12.06) years;53.8％ female].Of the enrolled patients,28.3％ were diagnosed with LAA at discharge,17.9％ with CE,42.8％ with SAO,11.0％ with SOE or SUE.And the mean BNP concentration was significantly higher in the CE group than that in other three subtypes (P ＜ 0.001).After adjustment for multiple clinical predictors like gender,age,coronary artery disease,atrial fibrillation and renal function,BNP and D-dimer were associated with CE [BNP OR:1.044 (95％ CI 1.025,1.064),P ＜ 0.001;D-dimer OR:1.511(95％ CI 1.020,2.238),P =0.039,respectively].Conclusion Through POCT technique in the EDs,cardioembolic stroke patients can be differentiated from other TOAST subtypes.BNP with/without D-dimer has good but different corresponding diagnostic performance in preliminary recognition of cardioembolic stroke patients.
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Objective To evaluate the role of cholinergic anti-inflammatory pathway in dexmedeto-midine pretreatment-induced reduction of acute lung injury in a rat model of intestinal ischemia-reperfusion ( I∕R) . Methods Twenty-four healthy male Sprague-Dawley rats, aged 2-3 months, weighing 200-250 g, were divided into 4 groups ( n=6) using a random number table method: sham operation group ( S group) , intestinal I∕R group ( II∕R group ) , dexmetomidine group ( DEX group) and α7 nicotinic acetyl-choline receptor antagonistα-bungarotoxin (α-BGT) group (α-BGT group) . Intestinal I∕R was produced by occlusion of the superior mesenteric artery ( SMA) for 60 min followed by 120 min of reperfusion in anesthe-tized rats. Dexmetomidine 5 μg·kg-1 ·h-1 was injected via the tail vein at 1 h before operation in DEX group andα-BGT group. α-BGT 1μg∕kg was intraperitoneally injected at 15 min before dexmetomidine in-jection in α-BGT group. Rats were sacrificed at 120 min of reperfusion, and lung tissues were obtained for microscopic examination of pathological changes ( with a light microscope) and for determination of wet∕dry weight ratio ( W∕D ratio) , tumor necrosis factor-alpha ( TNF-α) and interleukin-6 ( IL-6) contents ( using enzyme-linked immunosorbent assay) , malondialdehyde ( MDA) content ( using thiobarbital acid method) and superoxide dismutase ( SOD) activity ( by xanthine oxidase method) . Results Compared with group S, the W∕D ratio and contents of MDA, TNF-αand IL-6 were significantly increased, and the SOD activi-ty was decreased in II∕R and α-BGT groups, and TNF-α and IL-6 contents were significantly increased in group DEX ( P<0. 05) . Compared with group II∕R, the W∕D ratio and contents of MDA, TNF-αand IL-6 were significantly decreased, SOD activity was increased (P<0. 05), and the pathological changes were significantly attenuated in group DEX. Compared with group DEX, the W∕D ratio and contents of MDA, TNF-α and IL-6 were significantly increased, SOD activity was decreased ( P<0. 05) , and the pathological changes were accentuated in group α-BGT. Conclusion Activation of cholinergic anti-inflammatory path-way is involved in the mechanism by which dexmedetomidine pretreatment reduces acute lung injury in a rat model of intestinal I∕R.
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Objective To analyze the incidence,risk factors,and impact of intraoperative conversion on the mortality in patients undergoing off-pump coronary artery bypass grafting.Methods This retrospective observational study included 207 patients undergoing off-pump coronary artery bypass grafting.According to whether intraoperative conversion,207 patients were randomly divided into intraoperative unchanged group(191 cases)and intraoperative changed group(16 cases).The incidence,patient characteristics,cause of intraoperative conversion,and its impact on outcome were studied.Results Intraoperative conversion increases odds for mortality to 25.0%,while the other group was 1.0%.The most common cause for intraoperative conversion was hemodynamic disturbances during grafting to the obtuse marginal artery.On multivariate logistic regression analysis,left main disease,mitral regurgitation and higher EuroSCORE II independently predicted intraoperative conversion.Conclusion Intraoperative conversion to on-pump coronary artery bypass grafting is independently associated with higher mortality in patients undergoing off-pump coronary artery bypass grafting.Identification of high risk group of intraoperative conversion may improve the outcome.
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Objective To explore the relationship of preoperative hemoglobin concentration and use of hospital resources.Methods 108 patients receiving cardiac surgery in the central hospital of wuhan were included.The relationship of preoperative hemoglobin concentration was explored on blood transfusion rates,return to the operating room for bleeding and/or cardiac tamponade,postoperative intensive care unit(ICU)and in-hospital length of stay,and mortality.Results For every 10-unit increase in hemoglobin(g/L),blood transfusion requirements were reduced by 8.0%,6.0%,and 3.0% for red blood cell units,platelet pools,and fresh frozen plasma units,respectively.For each 10-unit decrease in hemoglobin(g/L),the probability(over time)of discharge from the ICU and hospital increased 7.0%,16.0% respectively.Conclusion A lower preoperative hemoglobin concentration resulted in increased use of hospital resources after cardiac surgery.Therefore,the correction of decreasing preoperative hemoglobin concentration could improve the use of hospital resources after cardiac surgery.
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OBJECTIVE: To investigate the effects of knockout cerebral cavernous malformation(CCM) virulence gene CCM3 on the migration induced by lead acetate in immortalized human umbilical vein endothelial cells(HUVECs) and to explore the possible mechanism of endoplasmic reticulum stress(ERS). METHODS: CCM3 wildtype(CCM3-WT) and CCM3 knockout(CCM3-KO) HUVECs were used as experimental cells. a) CCM3-WT and CCM3-KO HUVECs were treated with lead acetate at 0,10,50 and 200 μmol/L for 24 hours. The migration of these cells was observed by woundhealing assay. b) CCM3-WT and CCM3-KO HUVECs were treated with lead acetate at 0,10,50 and 200 μmol/L for 24 hours,and at 50 μmol/L for 0,6,12,24 and 48 hours,and the mRNA expression of genes of unfolded protein response pathway were detected by quantitative real-time polymerase chain reaction; the protein expression of glucose-regulated protein 78(GRP78) was detected by Western blotting. c) CCM3-WT and CCM3-KO HUVECs were divided into lead exposure group and tauroursodeoxycholic acid(TUDCA) group. The former was treated with 50 μmol/L lead acetate for 24 hours,and the latter was pre-treated with ERS inhibitor TUDCA,followed by 50 μmol/L lead acetate. The migration of these cells was observed by wound-healing assay. RESULTS: a) The migration of CCM3-WT and CCM3-KO cells decreased and showed a dose-effect relationship with the increase of lead acetate concentration(P < 0. 05). b) The mRNA relative expression of the GRP78,protein kinase-like endoplasmic reticulum kinase(PERK),transcription activator 4(ATF4) and CCAAT enhancer binding homologous protein(CHOP) in CCM3-KO cells treated with 10,50 and 200 μmol/L lead acetate were higher than that in CCM3-WT cells at the same doses,except for the GRP78 in CCM3-KO cells treated with10 μmol/L lead acetate(P < 0. 05). The mRNA expression of PERK and CHOP in CCM3-KO cells increased in a timeeffect relationship with the increase of lead-exposure time(P < 0. 05). The mRNA relative expression of the four genes in CCM3-KO cells were higher than those in CCM3-WT cells at 48 hours(P < 0. 05). When cells were treated with 50μmol/L lead acetate,the protein expression of GRP78 in CCM3-KO cells was higher than that in CCM3-WT cells(P <0. 05),and the protein expression of GRP78 in CCM3-KO cells increased in a time-effect relationship with the increase of lead-exposure time(P < 0. 05). c) The cell migration of TUDCA group was lower than that of lead-exposure group(P <0. 05). CONCLUSION: Lead acetate may activate ERS by activating the PERK-ATF4-CHOP signaling pathway,thereby reducing the migration of HUVECs. CCM3 gene has a protective effect on cell migration.
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Objective To evaluate the effects of dexmedetomidine on the oxidative stress responses during global cerebral ischemia-reperfusion (I/R) in rats.Methods Thirty-six male Sprague-Dawley rats,weighing 250-300 g,were randomly divided into 3 groups (n =12 each) using a random number table:sham operation group (group S),global cerebral I/R group (group I/R) and dexmedetomidine group (group D).Global cerebral ischemia was induced by occlusion of bilateral common carotid arteries combined with hypotension (MAP maintained at 35-45 mmHg).In group D,dexmedetomidine was infused at a rate of 3 μg · kg-1 · h-1until 2 h of reperfusion after a loading dose of dexmedetomidine 3 μg/kg was intravenously injected immediately after onset of reperfusion.The neurological deficit score (NDS) was assessed at 24 h of reperfusion,the rats were then sacrificed,and their brains were immediately removed for determination of cell apoptosis and levels of malondialdehyde (MDA),superoxide dismutase (SOD) and catalase (CAT).Apoptotic rate was calculated.Results Compared with group S,NDS,apoptotic rate and MDA level were significantly increased,and SOD and CAT levels were decreased in I/R and D groups.Compared with group I/R,NDS,apoptotic rate and MDA level were significantly decreased,and SOD and CAT levels were increased in group D.Conclusion Dexmedetomidine attenuates global cerebral I/R injury through inhibiting the oxidative stress responses.
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<p><b>OBJECTIVE</b>To investigate the effect of CCM3 gene defection on lead induced cell genotoxicity in mouse embryonic fibroblasts.</p><p><b>METHODS</b>C57 female mice were mated with CCM3 gene heterozygous male mice. E13.5 embryos were taken to isolate primary mouse embryonic fibroblasts. After genotyping, wild type and heterozygous cells were treated with different doses of lead acetate. Cell viability, genotoxicity and protein expression were detected by MTS assay, CB micronucleus method and Western blot, respectively.</p><p><b>RESULTS</b>Mouse embryonic fibroblasts with lead acetate treatment for 24 h, wild-type cells 100.00 µmol/L lead acetate-treated group (69.16±1.36) and the control group (100.00±2.33) compared to cells decreased by 30%, CCM3 heterozygous type cell 100.00 µmol/L lead acetate-treated group (87.16±5.50) and the control group (100.00±2.06) compared to cells decreased by 13%, the difference was statistically significant (F values were 98.59, 82.63, P<0.001). Lead acetate treatment after 48 h, wild-type cells 100.00 µmol/L lead acetate-treated group (51.99±5.62) and the control group (100.00±3.11) compared to cells decreased by 50%, heterozygous type cells 100.00 µmol/L lead acetate treatment group (66.33±4.06) and the control group (100.00±5.72) compared to cells decreased by 35%, the differences were statistically significant (F values were 82.63, 36.86, P < 0.001). The results of CBMN test showed that with increased dose, micronucleus cell rate of two genotypes showed an increasing trend, in the wild-type cells, the micronucleus cell rate (/1 000) for the control group, 29.6±2.2, 6.25 µmol/L dose group 47.3±6.6, 25 µmol/L dose group 55.5±9.1, 100.00 µmol/L dose group 66.8±3.5; heterozygous cells micronucleus cell rate (/1 000) for the control group, 35.3±5.6, 6.25 µmol/L dose of 50.0±8.3, 25.00 µmol/L dose group 57.0±8.5, 100.00 µmol/L dose group 58.8±2.1. Micronucleus cell rates (/1 000) were significant differences, in 100.00 µmol/L dose groups of two genotypes. Western blot results showed that wild-type cells CCM3 expression 100.00 µmol/L lead acetate-treated group (0.70±0.03) was 1.32 times higher than the control group (0.53±0.07), heterozygous cells CCM3 expression 100.00 µmol/L lead acetate-treated group (0.48±0.02) was 1.77 times higher than control group that of 0.27±0.04, there was statistically significant difference (F values were 14.77, 25.74, P < 0.001); wild-type cells γ-H2AX expression 100.00 µmol/L lead acetate-treated group (0.69±0.03) was 1.06 times higher than the control group (0.65±0.07), heterozygous cells γ-H2AX expression 100.00 µmol/L lead acetate-treated group (0.99±0.04) was 1.55 times higher than the control group CCM3 expression levels (0.64±0.06), there was statistically significant difference (wild-type cells: F = 7.08, P = 0.012, heterozygous type cell: F = 13.49, P = 0.002).</p><p><b>CONCLUSION</b>CCM3 gene may play a role in lead-induced genetic toxicity of mouse embryonic fibroblasts, CCM3 gene-lead interactions effects on mouse embryonic fibroblasts cell toxicity.</p>
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Animals , Female , Male , Mice , Apoptosis Regulatory Proteins , DNA Damage , Embryo, Mammalian , Fibroblasts , Genotype , Membrane Proteins , Mice, Inbred Strains , Micronuclei, Chromosome-Defective , Organometallic Compounds , Proto-Oncogene ProteinsABSTRACT
Objective To evaluate the effects of meglumine cyclic adenylate (MCA) pretreatment on acute lung injury (ALI) induced by lipopolysaccharide (LPS) in rats.Methods Fifty-four adult male Sprague Dawley rats,aged 2-3 months,weighing 200-250 g,were randomly divided into 3 groups (n =18 each) using a random number table:control group (group C),ALI group and MCA pretreatment group (group MCA).ALI was induced with LPS 10 mg/kg injected via the femoral vein in ALI and MCA groups.In group MCA,MCA 2 mg/kg was injected via the femoral vein at 20 min before LPS injection,while the equal volume of normal saline was given in C and LPS groups.Immediately before LPS injection and at 2 and 4 h after LPS injection,the blood samples were taken from the abdominal aorta for determination of PaO2,PaCO2 and plasma concentrations of tumor necrosis factor-alpha (TNF-α) and interleukin-10 (IL-10).Six rats were sacrificed at 4 h after LPS injection and pulmonary specimens were obtained for microscopic examination of the pathological changes and for determination of cyclic adenosine monophosphate (cAMP) activity (by ELISA) and NF-κB p65 expression in nucleus (by Western blot).Results Compared with group C,PaO2 and cAMP activity in lung tissues were significantly decreased,and PaCO2,plasma concentrations of IL-10 and TNF-α and NF-κB p65 expression in nucleus in lung tissues were increased in group LPS.Compared with group LPS,PaO2,cAMP activity in lung tissues and plasma concentrations of IL-10 were significantly increased,and PaCO2,plasma concentration of TNF-α and NF-κB p65 expression in nucleus in lung tissues were decreased and the pathologic changes of lungs were attenuated in group MCA.Conclusion MCA pretreatment can attenuate ALI induced by LPS,and the mechanism is related to increased level of cAMP,activated cAMP signaling pathway,inhibited NF-κB activity and reduced inflammatory responses in lung tissues of rats.
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Objective To evaluate the effects of dexmedetomidine on the permeability of blood-brain barrier in rats subjected to global cerebral ischemia-reperfusion (I/R).Methods Thirty-six male Sprague-Dawley rats,weighing 250-300 g,were randomly divided into 3 groups (n =12 each):sham operation group (group S),global cerebral I/R group (group I/R) and dexmedetomidine group (group D).Global cerebral I/R was induced by occlusion of bilateral common carotid arteries combined with hypotension (MAP was maintained at 35-45 mm Hg) in anesthetized rats.In group D,dexmedetomidine was infused at a rate of 3μg· kg-1 · h-1 until 2 h of reperfusion after a loading dose of dexmedetomidine 3 μg/kg was injected intravenously immediately after onset of I/R.The rats were sacrificed at 24 h of reperfusion and their brains were immediately removed for microscopic examination of hippocampal CA1 region and for determination of the cell apoptosis,brain water content,Evans blue content and aquaporin 4 (AQP4) expression.Results The number of apoptotic cells was significantly larger,and brain water content,Evans blue content and AQP4 expression were higher in groups I/R and D than in group S (P ＜ 0.05 or 0.01).The number of apoptotic cells was significantly smaller,and brain water content,and Evans blue content and AQP4 expression were lower in group D than in group I/R (P ＜ 0.05 or 0.01).Global cerebral I/R-induced pathological changes were significantly attenuated in group D.Conclusion Dexmedetomidine can decrease the permeability of blood-brain barrier and attenuate global cerebral I/R injury in rats,and down-regulation of AQP4 expression may be involved in the mechanism.
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Objective To evaluate the effect of nicotine pretreatment on cardiac function following myocardial ischemia-reperfusion (I/R) in rats.Methods Sixty male Sprague-Dawley rats,weighing 200-250 g,were randomly divided into 3 groups (n =20 each):sham operation group (group S),group I/R and nicotine pretreatment group (group N).The rats were anesthetized with intraperitoneal 20％ urethane 1 g/kg,tracheostomized and mechanically ventilated.Myocardial ischemia was induced by occlusion of the left anterior descending branch of coronary artery for 30 min followed by 120 min of reperfusion.The left anterior descending branch of coronary artery was only exposed,but not occluded in group S.Nicotine 400 μg/kg was injected intravenously via the right jugular vein at 30 min before myocardial ischemia in group N.The equal volume of normal saline was injected instead in groups S and I/R.Before ischemia,at 30 min of ischemia and at 30 and 120 min of reperfusion,10 rats from each group were chosen for record of left ventricular systolic pressure (LVSP),left ventricular diastolic pressure (LVDP),± dp/dtmax,HR and mean arterial pressure (MAP).Blood samples were collected from the right carotid artery of the left 10 rats in each group at 60 min of reperfusion to measure plasma CK-MB activity and cTnI and TNF-α concentrations.Results Compared with group S,MAP and LVSP at T2,3 and HR,LVDP and ± dp/dtmax at T1-3 were significantly decreased,and the plasma CK-MB activity and cTnI and TNF-α concentrations were increased in group I/R,and LVDP at T1,2 and HR and ± dp/dtmax at T1-3 were significantly decreased,and the plasma CK-MB activity and cTnI and TNF-α concentrations were increased in group N (P ＜ 0.05).Compared with group I/R,MAP,HR,LVSP,LVDP and ± dp/dtmax were significantly increased at T3,and the plasma CK-MB activity and cTnI and TNF-α concentrations were decreased in group N (P ＜ 0.05).Conclusion Nicotine pretreatment can reduce myocardial I/R injury through activating cholinergic anti-inflammatory pathway,thus improving cardiac function in rats.
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Objective To describe body mass index (BMI) changes in migrant children with overweight and obesity in Beijing treated by the exercise and dietary intervention programme.Methods BMI was assessed at before and after the intervention in 30 migrant obesity and overweight children aged 9 ～ 12 in two schools from March,2010.Results BMI reduced significantly one week after the intervention ( P ＜ 0.05 ),but from two months to six months after the intervention BMI increased again to the pretreatment level( P ＜ 0.05 ).Conclusion The intervention was successful in decreasing BMI,however maintenance of BMI after treatment was not easy.The controlling of obesity and overweight is a long term process which needs the cooperation and supervision of their parents.
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In order to evaluate the effectiveness of everolimus vs. rapamycin in the treatment of diabetic nephropathy, 8-week old diabetic (db/db) mice received everolimus (2 mg/kg every day) or rapamycin (2 mg/kg every day) for 4 weeks or 12 weeks respectively. Blood and 24-h urine samples were collected for biochemical tests. One kidney from each mouse was homogenized for protein analysis and the other was removed for histological analysis. The expression levels of transforming growth factor-β1 (TGF-β1)and phospho-p70s6k were detected by using ELISA and Western blot, respectively in the renal tissue as well as in mesengial cell culture samples. Everolimus was significantly more effective than rapamycin in improving indexes of renal function and glomerular hypertrophy, and in decreasing accumulation and expansion of the extracellular matrix. However, everolimus inhibited TGF-β1 secretion and p70s6k phosphorylation induced by high glucose in vitro less efficiently than rapamycin at the same dose. Everolimus was more effective than rapamycin in preventing diabetic nephropathy in vivo, which may be contributed to the fact that everolimus has better bioavailability and a higher oral absorption rate.
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Objective To investigate the effects of dexmedetomidine on global cerebral ischemia-reperfusion (I/R) injury in rats.Methods Fifty-four adult male SD rats weighing 200-250 g were randomly divided into 3 groups (n =18 each): shame operation group (group S),global cerebral I/R group (group I/R) and dexmedetomidine group (group D).Global cerebral I/R was produced by occlusion of bilateral common carotid arteries combined with hypotension (MAP maintained at 35-45 mm Hg).In group D dexmedetomidine 3 μg/kg was injected iv immediately after I/R,followed by infusion of dexmedetomidine at a rate of 3 μg· kg- 1 · h- 1 until 2 h of reperfusion.The neurological deficit score (NDS) was assessed (0 =normal,100 =brain death) at 6 h (T1),24 h (T2)and 72 h (T3) of reperfusion.Then six rats were sacrificed in each group and brain tissues were removed for microscopic examination of hippocampus CA1 region and determination of activity of myeloperoxidase (MPO),contents of TNF-α and IL-1β and expression of glial fibrillary acidic protein ( GFAP).Results Compared with group S,NDS,MPO activity and the contents of TNF-α and IL-1β at T1-3 were significantly increased,the expression of GFAP was up-regulated at T2,3 in groups I/R and D ( P ＜ 0.05 or 0.01).Compared with group I/R,NDS,MPO activity and TNF-α concent were significantly decreased at T1-3,IL-1β concent was decreased at T1,2,the expression of GFAP was down-regulated at T2,3 in group D (P ＜ 0.05 or 0.01 ).The pathologic changes were significantly attenuated in group D as compared with group I/R.Conclusion Dexmedetomidine can attenuate global cerebral I/R injury in rats,and the inhibition of inflammatory response may be involved in the mechanism.