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The Alataw Pass, near the Ebinur Lake Wetland (northwest of China) and Taldykorgan (east of Kazakhstan), is a natural habitat for wild rodents. To date, little has been done on the surveillance of Bartonella spp. and Wolbachia spp. from fleas in the region. Here we molecularly detected Bartonella spp. and Wolbachia spp. in wild rodent fleas during January and October of 2016 along the Alataw Pass-Kazakhstan border. A total of 1,706 fleas belonging to 10 species were collected from 6 rodent species. Among the 10 flea species, 4 were found to be positive for Wolbachia, and 5 flea species were positive for Bartonella. Molecular analysis indicated that i) B. rochalimae was firstly identified in Xenopsylla gerbilli minax and X. conforms conforms, ii) B. grahamii was firstly identified in X. gerbilli minax, and iii) B. elizabethae was firstly detected in Coptopsylla lamellifer ardua, Paradoxopsyllus repandus, and Nosopsyllus laeviceps laeviceps. Additionally, 3 Wolbachia endosymbionts were firstly found in X. gerbilli minax, X. conforms conforms, P. repandus, and N. laeviceps laeviceps. BLASTn analysis indicated 3 Bartonella species showed genotypic variation. Phylogenetic analysis revealed 3 Wolbachia endosymbionts were clustered into the non-Siphonaptera Wolbachia group. These findings extend our knowledge of the geographical distribution and carriers of B. rochalimae, B. grahamii, B. elizabethae, and Wolbachia spp. In the future, there is a need for China-Kazakhstan cooperation to strengthen the surveillance of flea-borne pathogens in wildlife.
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Bartonella , Ecosystem , Lakes , Rodentia , Siphonaptera , Wetlands , Wolbachia , XenopsyllaABSTRACT
OBJECTIVE@#To investigate the effects of autophagy on osteogenic differentiation of stem cells from the apical papilla (SCAPs) in the presence of tumor necrosis factor- (TNF-) stimulation .@*METHODS@#SCAPs treated with TNF- (0, 5, and 10 ng/mL) with or without 5 mmol/L 3-MA were examined for the expression of autophagy marker LC3-Ⅱ using Western blotting. The cells were transfected with GFP-LC3 plasmid and fluorescence microscopy was used for quantitative analysis of intracellular GFP-LC3; AO staining was used to detect the acidic vesicles in the cells. The cell viability was assessed with CCK-8 assays and the cell apoptosis rate was analyzed using flow cytometry. The cells treated with TNF- or with TNF- and 3-MA were cultured in osteogenic differentiation medium for 3 to 14 days, and real- time PCR was used to detect the mRNA expressions of osteogenesis-related genes (ALP, BSP, and OCN) for evaluating the cell differentiation.@*RESULTS@#TNF- induced activation of autophagy in cultured SCAPs. Pharmacological inhibition of TNF--induced autophagy by 3-MA significantly decreased the cell viability and increased the apoptosis rate of SCAPs ( < 0.05). Compared with the cells treated with TNF- alone, the cells treated with both TNF- and 3-MA exhibited decreased expressions of the ALP and BSP mRNA on days 3, 7 and 14 during osteogenic induction ( < 0.05) and decreased expression of OCN mRNA on days 3 and 7 during the induction ( < 0.05).@*CONCLUSIONS@#Autophagy may play an important role during the osteogenic differentiation of SCAPs in the presence of TNF- stimulation.
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Humans , Autophagy , Physiology , Cell Differentiation , Physiology , Cell Survival , Cells, Cultured , Dental Papilla , Cell Biology , Green Fluorescent Proteins , Osteogenesis , Physiology , Stem Cells , Physiology , Transfection , Tumor Necrosis Factor-alpha , PharmacologyABSTRACT
Objective To probe the difference of MSCT features between clear cell renal cell carcinoma (ccRCC)and renal oncocytoma (RO),to improve the diagnostic accuracy.Methods 31 cases of ccRCC and 16 cases of RO which were confirmed by pathology were analyzed retrospectively,and the difference in some CT features including the morphology and CT value of plain scanning and three phases of enhancement scanning were analyzed.Results The diameter of the tumor of the ccRCC group was (5.04 ± 1.9 1 4)cm,meanwhile that of the RO group was (3.5 9±2.1 6)cm,exhibiting statistically significant difference in the diameter which was bigger in ccRCC group than that in RO group (P＝0.023).There were 90.32% (28/31)of cases with cystic necrosis in the ccRCC group and 18.75%(3/16)in the RO group,which was statistically significant that the patients with cystic deterioration in the ccRCC group were more than those in the RO group (P＜0.001).35.48% (11/31)of cases with peritumoral or intratumoral neovascularization in the ccRCC group and no cases in the RO group were found,and there was a statistically significant difference (P＝0.009).The enhancement degree in the ccRCC group was greater than that in the RO group in cortical phase and excretory phase,but lower in parenchy phase.However, there was no significant difference in the enhancement degree and the enhancement index in three phases of enhancement scanning (P＞0.05). Conclusion MSCT can demonstrate the renal tumor with or without cystic necrosis and neovascularization around or inside the tumor,which is helpful to differentiate ccRCC from RO.
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To investigate the genotype and the biological characteristics of Tick-borne encephalitis virus (TBEV) in Charles Hilary endemic foci in the China-Kazakhstan border area in Xinjiang,ticks were collected by flagging during May to June in 2012 and 2014,and were stored in liquid nitrogen.TBEV strains were isolated from tick samples by inoculating BALB/c mice and BHK-21 cells.The FE gene fragments of TBEV-Far and the S gene fragments of TBEV-Sib were detected by RT-PCR from infected mice brain tissue and BHK cells,and then subjected to sequence alignment.Totally 16 TBEV strains were isolated from Ixodes persulcatus and Dermuceuter silvarum,among 13 strains were Far eastern subtype,three strains were Siberian subtype.It was first time that the TBEV-Sib was isolated in China.The Charles Hilary TBE natural foci were in the China-Kazakhstan border area,and both TBEV-Far and TBEV-Sib co-circulated.
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Objective To explore the long-term effects of physical exercise on learning,memory and the expression of plasticity-related gene-1 (PRG-1) in the cerebral cortex of rats with penicillin-induced developmental seizures.Methods Twenty-four 21-day Sprague-Dawley rats were randomly divided into a control group (CONT1),an exercised control group (CONT2),a seizure group (EXP1) and a seizure plus exercises group (EXP2),each of 6 using a random number table.Penicillin was injected intraperitoneally to the rats in the EXP1 and EXP2 groups to induce seizures,while those in the CONT1 and CONT2 groups received saline injections.Morris water-maze tests were performed to evaluate spatial learning and memory capacity.The rats in the CONT2 and EXP2 groups were administered an aerobic exercise program 30 min per day for 6 consecutive days.The other groups were maintained on the treadmill for the same time but without exercising.Real-time polymerase chain reactions were used to quantify the expression of PRG-1 mRNA in the cerebral cortex.Results There was a decreasing trend in marginal searching and increasing taxis and linear searching in all four groups.Ridit analysis showed that in the watermaze tests on days 2 and 4 the average scores of the control groups were significantly higher than those of the EXP1 and EXP2 groups.However,significant increases in the average scores were observed in the maze tests of the EXP1 group after day 2 and with the EXP2 group from day 4 on.The average scores of the control group were significantly lower than those of the other 3 groups.In the first maze test,the average memory scores of the two seizure groups were significantly lower than those of the controls.In the second maze test,however,only the EXP1 group's average score was significantly worse than those of the other groups.That of the EXP2 group had improved significantly,and was not significantly different from that of the CONT2 group.The expression of PRG-1 was much higher in the CONT2,EXP1 and EXP2 groups than in the CONT1 group.The average expression of PRG-1 in the EXP2 group was not significantly different from that in the EXP1 group.Conclusions Physical exercise can significantly relieve the cognitive deficits induced by long-term seizures,which may be associated with the regulation of PRG-1 expression in the cerebral cortex.
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Objective To investigate the feasibility of automatic spectral imaging protocol selection (ASIS) and adaptive statiatical iterative reconstruction (ASiR) technique to reduce radiation dose and dose of contrast agent.Methods Sixtyfour patients underwent routine abdominal examination were randomly divided into two groups.The test group used ASIS technique,with 30％ ASiR and 50％ ASiR reconstruction algorithm.The control group used 120 kVp tube voltage,FBP reconstruction method.The noise of liver,pancreas,sacrospinal muscle,CNR of liver and pancreas,subjective image score in arterial phase and portal venous phase were compared between the image of 70 keV+30％ ASIR and control group.CNR of abdominal aorta and its branchs,CNR of portal vein,and subjective image score were statistically analyzed between im age 55 keV+50％ ASiR and control group in the arterial phase and portal venous phase.Results Compared with control group,CT dose index volume for arterial phase and portal venous phase in test group decreased by 23.68％,23.57％ and dose length product decreased by 25.61％,18.45 ％,total contrast injection decreased 16.86 ％,the noise of liver,pancreas and sacrospinal muscle in 70 keV+30％ ASiR were lower than those of control group in abdominal arterial and portal phase (all P＜0.05).CNR of abdominal aorta,superior mesenteric artery,celiac axis and score in 55 keV+50％ ASiR were higher than those of control group in abdominal arterial phase (all P＜0.05),CNR of portal vein and score in portal phase had no statistically difference (all P＞ 0.05).Conclusion Combining of ASIS and ASiR including 70 keV + 30％ ASiR and 55 keV+50％ ASiR,images are superior to that of the conventional 120 kVp+FBP scan mode for abdominal CT image and vessel image quality,which can reduce the radiation dose and the dose of contrast agent.
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We conducted the detection the Francisella spp.nucle acid from Hyalomma asiaticum asiaticum that main distribution is on railway line area from China-Kazakhstan border.The free-living ticks were collected and then identified by morphological and molecular methods.After species identification,they were detected by PCR targeting 16S rRNA and sdhA of Francisella spp.The amplified products were sequenced and the sequences was analyzed by using the Blast.A phylogenetic tree was constructed using MEGA 6 software.A total of 243 fleas were identified as H.asiaticum asiaticum.Only 35 samples were detected for Francisella spp.positive and the positive rate was 14.4％.Sequence analysis showed that two different sequences (seql and seq2) and all belong to Francisella-like endosymbionts (FLEs).Phylogenetic analyses showed that two FLEs were belong to the same cladd.This is first detection of FLEs nucleic acid from H.asiaticum Railway line area of China-Kazakhstan border.
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Objective To investigate the infection state and genotype of Babesia from tick at Alataw port,the China-Kazakhstan border.Methods Drag-flag method and animal body surface method were used to collect ticks at Ebinur Lake wetland,Alataw port.18s rRNA gene of Babesia was tested by polymerase chain reaction (PCR),the sequence analysis was conducted with Blast and phylogenetic analysis was conducted with Mega 6.0.Results The positive rate of Babesia gene in ticks was 12.65％ (32/253) at Alataw port.By sequencing,32 sequences were divided in ALSK174,ALSK191,ALSK019 three groups.Analysis of Blast showed that ALSK174 had the highest homology with Babesia caballi (EU888904,South Africa),it was 99.72％ (356/357);ALSK191 had the highest homology with Babesia occultans (KP745626,Turkey),it was 99.72％ (350/351);ALSK019 had 95.76％ (339/354) homology with Babesia odocoilei (KC460321,Canada).Conclusion In this study,we have first reported that the Babesia is infected from ticks at Alataw port,the China-Kazakhstan border.
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[ ABSTRACT] AIM:To investigate the distribution of mast cells ( MCs) and the expression of transforming growth factor-β(TGF-β) on tryptase positive MCs in different types of human periapical diseases.METHODS:Total 78 cases of specimens were involved in this study, including healthy control, periapical cyst and periapical granuloma.The tissue sam-ples were fixed in 10% formalin for at least 48 h, stained with hematoxylin and eosin for histopathological examination, stained with toluidine blue staining for identifying MCs and MCs degranulation, and stained with double immunofluores-cence for identification of tryptase-TGF-βdouble positive MCs.RESULTS:The density of tryptase-TGF-βdouble positive MCs in the periapical lesions was significantly higher than that in the healthy controls ( P<0.01) .The number of TGF-βpositive MCs in the periapical cyst was significantly higher than that in the periapical granuloma ( P<0.01 ) .Compared with toluidine blue staining, the number of MCs with double immunofluorescence staining significantly increased ( P <0.01).CONCLUSION:The TGF-βpositive MCs may play an important role in the pathogenesis of human chronic peria-pical diseases, particularly in the formation of fibrous tissue in periapical cyst.Double immunofluorescence staining is more sensitive than the traditional toluidine blue staining for identifying MCs.
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AIM:To investigate the expression of long non-coding RNA maternally expressed gene 3 (MEG3) in colorectal cancer ( CRC) cells, and to observe the effect of MEG 3 on the invasion and migration of CRC cells .METH-ODS:The levels of MEG3 in human normal colon cell NCM 460 and CRC cells SW48 and LoVo were detected by real-time PCR.MEG3 was over-expressed by plasmid transfection , and the effects of MEG 3 on the invasion and migration of SW 48 and LoVo cells were analyzed by Transwell assay and wound healing assay .The expression of matrix metalloproteinase ( MMP) family proteins was determined by Western blotting .RESULTS:The level of MEG3 was down-regulated in CRC cells compared with normal colon cell NCM 460.The invasion and migration of CRC cells were reduced after MEG 3 over-ex-pression.Transwell invasion and migration assays showed that the numbers of transmembrane SW 48 and LoVo cells were smaller in MEG3 over-expression group than control group (P<0.05).The cell spaces were broader after MEG3 over-ex-pression in the wound healing assay , indicating that MEG3 over-expression inhibited the mobility of CRC cells .Meanwhile, over-expression of MEG3 reduced the expression of MMP-2 and MMP-9, and elevated the expression of tissue inhibitor of metalloproteinase-2 (TIMP-2).CONCLUSION:The expression of MEG3 is down-regulated in CRC cells.Over-expres-sion of MEG3 inhibits the invasion and migration of CRC cells .TIMP-2, MMP-2 and MMP-9 might play an important role in this regulation .
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Objective To investigate the effect of sulforaphane on 1-methyl-4-phenylpyridinium (MPP +)-induced cell viability loss in cultured PC12 cells and to explore the possible mechanism.Methods MPP + induced damage in PC12 cells was prepared as oxidative damage model.Sulforaphane (0.5,1.O,2.5,5.0 and 10.0 μmol/L) was added in each group cell growth medium.Subsequent experiments were divided into 4 groups:(A) normal control group,(B) sulforaphane group,(C) MPP+ injury group,(D)sulforaphane pretreatment + MPP+ injury group.Cell viability was detected by MTT assay,and the sulforaphane pretreatment PC12 cell viability was observed in different concentrations.Flow cytometry was used to detect changes in the rate of apoptosis in different packet PC12 cells,and protein expression levels of nuclear factor erythroid2-related factor 2 (Nrf2),heme oxygenase (HO-1) and human NAD (P) H dehydrogenase,quinone 1 (NQO1) were detected by Western blot when the PC12 cells were incubated with sulforaphane (2.5 μmol/L) and (or) MPP+ (500 μmol/L) for 24 h in vitro.Results Compared to control group (cell survival rate was 98.70％),the survival percents of PC12 cells were significantly decreased in MPP+-treated group (58.16％).A significant difference was showed between group A and C (F =21.83,P ＜ 0.05),and the cell survival rate in group D was significantly improved.Compared to control group,the rate of apoptosis in MPP+ injury group was increased,and the rate of apoptosis after pretreatment of the sulforaphane was significantly reduced.Compared to MPP+ injury group,the levels of Nrf2,HO-1 and NQO1 protein expression were significantly increased in sulforaphane pretreatment group.Conclusion Sulforaphane have a protective effect against MPP+-induced PC12 cell model damage,and the protective effect may be achieved by activating the Nrf2-antioxidant response element pathway.
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The normal range of oral mucosal cell apoptosis and proliferation rate through a larger sample of non-malnourished crowd was investigated, and the nutritional status of clinical patients was assessed. Of 194 clinical patients selected according to "NRS2002" guidance, there were 167 non-malnourished patients and 27 malnourished cases, respectively. Twelve patients with toxic reactions of grade III after postoperative chemotherapy (POC) were chosen. The oral mucosal epithelial apoptosis and proliferation rate were measured by using flow cytometry. The statistical significance was processed by using unpaired t-test. The results showed that there was no significant difference in gender, age and body weight between malnourished and non-malnourished groups. The normal range of oral mucosal epithelial apoptosis and the proliferation rate was (27.50±1.50)% and (15.12±1.68)% in non-malnourished patients, and that was (19.90±4.14)% and (6.66±5.83)% in the malnourished patients, respectively. It is concluded that the normal range of oral mucosa cell apoptosis and proliferation rate is achieved, which can not be influenced by gender, age, weight and other factors, and could be used as a sensitive and accurate index to assess the nutritional status of clinical patients.
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Female , Humans , Male , Middle Aged , Apoptosis , Physiology , Cell Proliferation , Mouth Mucosa , Pathology , Physiology , Nutritional Status , PhysiologyABSTRACT
Keap1 -Nrf2/ARE pathway plays a wide role of cell protection function in anti-tumor,antistress,anti-apoptosis,anti-inflammatory response.It has become a focus of the neuroprotective effects in nervous system.We will review on the latest research of Keap1-Nrf2/ARE pathways in cerebral ischemia.It will provide a basis for the prevention and treatment of central nervous system.
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The normal range of oral mucosal cell apoptosis and proliferation rate through a larger sample of non-malnourished crowd was investigated, and the nutritional status of clinical patients was assessed. Of 194 clinical patients selected according to "NRS2002" guidance, there were 167 non-malnourished patients and 27 malnourished cases, respectively. Twelve patients with toxic reactions of grade III after postoperative chemotherapy (POC) were chosen. The oral mucosal epithelial apoptosis and proliferation rate were measured by using flow cytometry. The statistical significance was processed by using unpaired t-test. The results showed that there was no significant difference in gender, age and body weight between malnourished and non-malnourished groups. The normal range of oral mucosal epithelial apoptosis and the proliferation rate was (27.50±1.50)% and (15.12±1.68)% in non-malnourished patients, and that was (19.90±4.14)% and (6.66±5.83)% in the malnourished patients, respectively. It is concluded that the normal range of oral mucosa cell apoptosis and proliferation rate is achieved, which can not be influenced by gender, age, weight and other factors, and could be used as a sensitive and accurate index to assess the nutritional status of clinical patients.
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Objective To compare imaging quality and radiation dose of different anode filter combination for full-field digital mammography.MethodsThe image of FLUKE NA 18-220 phantom were taken at full-field digital mammography (FFDM),system with Mo/Mo,Mo/Rh,Rh/Rh anode/filter combination by automatic exposure control,record the exposure factors and doses.The images on monitor with the best window width and window level were read by 4 independent radiologists,the images of specks groups,nylon fibers and masses was assessed by the 4 experienced readers at the criterion of American College of Radiology 1999 mammography quality control manual.Statistical analysis was performed using analysis of variance.ResultsThe nylon fibers scores of Mo/Mo,Mo/Rh and Rh/Rh were 5.50 ± 2.12,4.50 ± 1.85 and 4.38 ± 1.38 ; the specks groups scores of Mo/Mo,Mo/Rh and Rh/Rh were 5.38 ± 1.98,4.25 ± 1.56 and 4.38 ± 1.38;the masses scores of Mo/Mo,Mo/Rh and Rh/Rh were 5.38 ± 1.98,4.38 ±1.68 and 4.25 ± 1.56,the detection of specks groups,nylon fibers was not statistically significant ( F =4.56 and 4.32,P ＞ 0.05 ),but the detection of masses was statistically significant ( F =36.65,P ＜ 0.05).The radiation doses were different,the entrance surface dose (ESD) and average glandular dose (AGD) of Rh/Rh were (5.11 ± 1.89) and ( 1.08 ± 0.13 ) mGy,the ESD and AGD of Mo/Mo were (6.66 ± 2.33 )and ( 1.29 ± 0.38 ) mGy,the ESD and AGD of Mo/Rh anode/filter combination were (5.67 ± 2.02) and ( 1.29 ± 0.38) mGy.ConclusionsThe radiation dose of Rh/Rh and Mo/Rh anode/filter combination of FFDM were lower,and the imaging was clear,so Rh/Rh and Mo/Rh anode/filter combination of FFDM prefer to mostly patients,especially when the thinkness is large,Rh/Rh anode/filter combination is preferred,because the kV values was higher,the penetration of X-ray was stronger.The Mo/Mo anode/filter combination was used when the needs of high-resolution,because the detection of masses of it was better.
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Objective To study the difference of image quality and radiation dose between different exposure modes with full-field digital mammography (FFDM).Methods The Fluke18-220mammographic phantom was exposed by FFDM system with different exposure modes at automatic exposure control ( AEC ) ,including contrast mode,standard mode and dose mode,and the exposure factors and radiation dose were recorded.The images on monitor with the best window width and window level were read by four independent radiologists.The images of specks groups,nylon fibers and masses was assessed by the four experienced readers at the criterion of American College of Radiology.Results The detection of specks groups,nylon fibers and masses were statistically different at the contrast mode and standard mode (F =41.321,P ＜ 0.05),further at the contrast mode and dose mode.The detection of specks groups、nylon fibers and masses were not statistically different( P ＞ 0.05 ) at standard mode and dose mode,but the radiation doses were different.The ESD at standard mode and dose mode was 4.5 and 3.15 mGy,respectively.The AGD of standard mode and dose mode was 1.18 mGy and 0.78 mGy,respectively.Conclusions The standard mode and dose mode of FFDM might be fit for most patients,especially at the dose mode.Contrast mode of FFDM should be strictly controled in use.
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Objective To develop transgenic mice harboring the fusion gene of mutant amyloid precursor protein and two types of fluorescent protein for the future study on Alzheimer's disease.Methods The fusion gene CFP-54 bp-YFP-C99 was introduced into mice by mieroinjection.The presence of CFP-54 bp-YFP-C99 was confirmed by PCR in the founders.Results CFP-54 bp-YFP-C99 gene was injected into pronucleus of 2202 zygotes and 1806 injected eggs were implanted into 56 foster mothers, 13 of which were pregnant.There were 13 foster mothers who borne 52 offspring and 32 of them survived.Recipient mouse pregnancy rate was 23.2% (13/56) and the integration rate was 3.9% (2/52).Conclusion CFP-54 bp-YFP-C99 transgenic mice is obtained, but the transgenic efficiency is low.
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The damage degree of neurons in perilesion at different time points was observed in order to explore the optimal operation occasion. Piglet lobar hematomas were produced by pressure-controlled infusions of 2.5 mL autonomous blood into the right frontal hemispheric white matter over 15 min, and the metabolic changes were ambulatorily detected with MRS at 3rd, 12th, 24th and 48th h after hematoma induction. Brain tissues of perihematoma were also obtained at different time points. The transcription level of Bax gene was detected by in situ hybridization and apoptosis by TUNEL technique, and the pathologic change of neurons was observed under an electron microscope. The results showed that the number of Bax positive cells reached the peak at 24 h (79.00 +/- 4.243/5 fields). There was no significant difference in A values between 3 h and 6 h, 12 h (P > 0.05), but there significant difference between 24 h and 3 h, 6 h, 12 h (P 0.05). Lac peak mainly occurred at 24 h and 48 h, while on the healthy side, no Lac peak was detectable. The ratio of NAA/Cr presented a descent tendency, but there was no significant difference among the groups before 12 h (P > 0.05), there was very significant difference between 3, 6 and 24, 48 h (P < 0.01). Under electronic microscopy, the neuronal damage surrounding hematoma in 3 to 6 h was milder than in 24 h to 48 h. It was concluded that the secondary apoptosis, damage and metabolic disturbance of the neurons surrounding hematoma was milder in 3-6 h in acute intracerebral hemorrhage, while obviously aggravated in 24-48 h. An effective intervention is needed to reduce secondary damage as soon as possible.
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Brain/pathology , Cerebral Hemorrhage/pathology , Hematoma/pathology , Magnetic Resonance Imaging , Neurons/pathology , Random Allocation , Swine , Swine, Miniature , Time FactorsABSTRACT
The damage degree of neurons in perilesion at different time points was observed in order to explore the optimal operation occasion. Piglet lobar hematomas were produced by pressure-controlled infusions of 2.5 mL autonomous blood into the right frontal hemispheric white matter over 15 min, and the metabolic changes were ambulatorily detected with MRS at 3rd, 12th, 24th and 48th h after hematoma induction. Brain tissues of perihematoma were also obtained at different time points. The transcription level of Bax gene was detected by in situ hybridization and apoptosis by TUNEL technique, and the pathologic change of neurons was observed under an electron microscope. The results showed that the number of Bax positive cells reached the peak at 24 h (79.00±4. 243/5 fields). There was no significant difference in A values between 3 h and 6 h, 12 h (P＞0.05), but there significant difference between 24 h and 3 h, 6 h, 12 h (P＜0.05). The number of apoptotic cells reached the peak at 24 h (P＜0. 001), and there was no significant difference betw een 3 h and 6 h (P=0. 999). The area of the apoptotic cells showed no significant difference between 3 h and 6 h or among 3 h, 6 h and 6 h (P＞0.05). Lac peak mainly occurred at 24 h and 48 h, while on the healthy side, no Lac peak was detectable. The ratio of NAA/Cr presented a descent tendency, but there was no significant difference among the groups before 12 h (P＞0.05), there was very significant difference between 3, 6 and 24, 48 h (P＜0.01). Under electronic microscopy, the neuronal damage surrounding hematoma in 3 to 6 h was milder than in 24 h to 48 h. It was concluded that the secondary apoptosis, damage and metabolic disturbance of the neurons surround ing hematoma was milder in 3-6 h in acute intracerebral hemorrhage, while obviously aggravated in 24-48 h. An effective intervention is needed to reduce secondary damage as soon as possible.
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To investigate the effect of immature dendritic cells (iDCs) on experimental autoimmune myasthenia gravis (MG), iDCs were generated in low dose of GM-CSF, and then they were pulsed with acetylcholine receptor (AchR) and transferred to allogeneic rats. After 3 weeks, all rats were immunized with AchR and complete Freund's adjuvant (CFA) and observed for the corresponding indices of MG for 7 weeks. Our results showed that compared with mature DCs (mDCs) generated at high dose of GM-CSF plus additional stimulation by lipopolysaccharide, iDCs expressed significantly lower levels of MHC-Ⅱ , CD80 and CD86, and their ability to uptake FITC-Dextran was stronger but the ability of stimulating proliferation of allogeneic T cells were weaker. Like controls,after immunization, all rats transferred with iDCs, mDCs and AchR-pulsed mDCs showed typical symptoms in 4 to 7 weeks. The amplitude of electromyogram wave dropped obviously, the level of serum AchRab increased and neuromuscular junction showed typical damage of MG. In contrast, no conspicuous changes were noted in rats transferred with AchR-pulsed iDCs. The results suggest that iDCs could be generated by inducing bone marrow precursors in low dose of GM-CSF, AchRpulsed iDCs could induce tolerance of EAMG. The dysfunction of DCs may play an important role in the initiation and maintenance of normal immune response in MG.