Background： Systemic lupus eiLythenaatosus （SLE） is a prototypic autoimmune disease wida complex genetic inheritance. This study was conducted to examine whether the association ofa proliferation-inducing ligand （...Background： Systemic lupus eiLythenaatosus （SLE） is a prototypic autoimmune disease wida complex genetic inheritance. This study was conducted to examine whether the association ofa proliferation-inducing ligand （APRIL）, spermatogenesis associated 8 （SPATA8）, platelet-derived growth lhctor receptor-alpha （PDGFRA）, and DNA polymerase beta （POLB） with SLE can be replicated in a Chinese Han population. Methods： Chinese SLE patients （n = 1247） and ethnically and geographically matched healthy controls （n 1440） were genotyped for the APRI L, SPATAS. PDGFRA, and POLB single-nucleotide polymorphisms （SN Ps）, rs3803800 rs8023715, rs1364089 and rsl2678588 using the Sequenom MassARRAY System. Results： The Chinese Hart SLE patients and controls had statistically similar liequencies of alleles and genotypes of four gene polynlorphisms. Moreover, no association signal was detected on different genetic models （additive, dominant, and recessive, all, P〉 0.05） or in SLE subgroups stratified by various clinical nlanifestations （all, P 〉 0.05）. Conclusions： Different genetic backgrounds from different ancestries and various populations may result in different genetic risk litctors for SLE. We did not detect any significant association with SNPs of APRIL SPATAS, PDGFRA, and POLB.展开更多
Background Estrogen receptor （ER）-negative breast cancer cells are more aggressive than ER-positive cells. Elevated levels of cyclooxygenase-2 （COX-2） and vascular endothelial growth factor-C （VEGF-C） expression...Background Estrogen receptor （ER）-negative breast cancer cells are more aggressive than ER-positive cells. Elevated levels of cyclooxygenase-2 （COX-2） and vascular endothelial growth factor-C （VEGF-C） expression have been detected in cultured human breast cancer cells and are associated with negative hormone receptor status. In this study, we created ERα stable transfectants in MDA-MB-231 cells to explore the effect of ERα on cell growth and COX-2 and VEGF-C expression.Methods The green fluorescent protein （GFP）-ERα plasmids were stably transfected into ER-negative MDA-MB-231 cells. The proliferation and migration of untransfected MDA-MB-231 cells, ERα-transfected MDA-MB-231 cells and ER-positive MCF-7 cells were determined. The expression of COX-2, and the levels of VEGF-C mRNA and the VEGF-C secretion concentration were assayed in these cell lines.Results The proliferation and migration capacities of ERα-tranfected MDA-MB-231 cells were significantly decreased （P 〈0.05）. The expression of COX-2 was significantly lower in ERa-tranfected MDA-MB-231 cells than in untranfected MDA-MB-231 cells. The mRNA and protein levels of VEGF-C were lower in ERa-tranfected MDA-MB-231 cells than in untransfected MDA-MB-231 cells （P〈0.05）.Conclusions ERα stable transfection inhibits proliferation and migration capacities of MDA-MB-231 cells and decreases expression of COX-2 and VEGF-C. The decreases of proliferation and migration capacities may be related to suppression of COX-2 and VEGF-C expression.展开更多
Pharmacophore is a commonly used method for molecular simulation, including ligand-based pharmacophore （LBP） and structure-based pharmacophore （SBP）. LBP can be utilized to identify active compounds usual with low...Pharmacophore is a commonly used method for molecular simulation, including ligand-based pharmacophore （LBP） and structure-based pharmacophore （SBP）. LBP can be utilized to identify active compounds usual with lower accuracy, and SBP is able to use for distin- guishing active compounds from inactive compounds with frequently higher missing rates. Merged pharmacophore （MP） is presented to integrate advantages and avoid shortcomings of LBP and SBP. In this work, LBP and SBP models were constructed for the study of per- oxisome proliferator receptor-alpha （PPARα） agonists. According to the comparison of the two types of pharmacophore models, mainly and secondarily pharmacological features were identified. The weight and tolerance values of these pharmacological features were adjusted to construct MP models by single-factor explorations and orthogonal experimental design based on SBP model. Then, the reliability and screening efficiency of the best MP model were validated by three databases. The best MP model was utilized to compute PPARα activity of compounds from traditional Chinese medicine. The screening efficiency of MP model outperformed individual LBP or SBP model for PPARα agonists, and was similar to combinatorial screening of LBP and SBP. However, MP model might have an advantage over the combination of LBP and SBP in evaluating the activity of compounds and avoiding the inconsistent prediction of LBP and SBP, which would be beneficial to guide drug design and optimization.展开更多
BACKGROUND Obesity and comorbidities onset encompass gut dysbiosis,altered intestinal permeability,and endotoxemia.Treatments that target gut dysbiosis can cope with obesity and nonalcoholic fatty liver disease(NAFLD)...BACKGROUND Obesity and comorbidities onset encompass gut dysbiosis,altered intestinal permeability,and endotoxemia.Treatments that target gut dysbiosis can cope with obesity and nonalcoholic fatty liver disease(NAFLD)management.Peroxisome proliferator-activated receptor(PPAR)-alpha activation and dipeptidyl-peptidase-4(DPP-4)inhibition alleviate NAFLD,but the mechanism may involve gut microbiota modulation and merits further investigation.AIM To address the effects of PPAR-alpha activation and DPP-4 inhibition(isolated or combined)upon the gut-liver axis,emphasizing inflammatory pathways in NAFLD management in high-fat-fed C57BL/6J mice.METHODS Male C57BL/6J mice were fed a control diet(C,10%of energy as lipids)or a highfat diet(HFD,50%of energy as lipids)for 12 wk,when treatments started,forming the groups:C,HF,HFA(HFD+PPAR-alpha agonist WY14643,2.5 mg/kg body mass),HFL(HFD+DPP-4 inhibitor linagliptin,15 mg/kg body mass),and HFC(HFD+the combination of WY14643 and linagliptin).RESULTS The HFD was obesogenic compared to the C diet.All treatments elicited significant body mass loss,and the HFC group showed similar body mass to the C group.All treatments tackled oral glucose intolerance and raised plasma glucagon-like peptide-1 concentrations.These metabolic benefits restored Bacteroidetes/Firmicutes ratio,resulting in increased goblet cells per area of the large intestine and reduced lipopolysaccharides concentrations in treated groups.At the gene level,treated groups showed higher intestinal Mucin 2,Occludin,and Zo-1 expression than the HFD group.The reduced endotoxemia suppressed inflammasome and macrophage gene expression in the liver of treated animals.These observations complied with the mitigation of liver steatosis and reduced hepatic triacylglycerol,reassuring the role of the proposed treatments on NAFLD mitigation.CONCLUSION PPAR alpha activation and DPP-4 inhibition(isolated or combined)tackled NAFLD in dietinduced obese mice by restoration of gut-liver axis.The reestablishment of the intestinal barrier a展开更多
Gastrointestinal stromal tumors(GISTs)represent a malignant gastrointestinal tumor of neurofibromatosis type 1(NF1)Von Recklinghausen disease.In the current case,we report a 27-year-old woman with NF1,who presented wi...Gastrointestinal stromal tumors(GISTs)represent a malignant gastrointestinal tumor of neurofibromatosis type 1(NF1)Von Recklinghausen disease.In the current case,we report a 27-year-old woman with NF1,who presented with a lower abdominal mass,symptomatic anaemia,and significant weight loss.We employed multiple approaches to assess the tumor behavior,including computed tomography(CT)scan,surgical tumor resection,histological and immunohistochemical analysis and gene sequencing.Additionally,the patient was given Imatinib mesylate(Gleevec)as adjuvant therapy.CT scan delineated a large thick wall cavity lesion connecting to the small bowel segment.Resection of the tumor yielded a mass of 17 cm×13 cm with achievement of safety margins.The diagnosis was GIST,confirmed by immunohistochemical expression of CD117,CD34,and Bcl-2.Sequencing revealed no mutations in either KIT or platelet-derived growth factor receptor-alpha,genes which are mutated in over 85%of sporadic GIST cases.Further,there was no evidence of recurrence,metastasis or metachronous GIST for over three years in our patient.From our analyses,we believe selective genotyping is advisable for high risk patients to predict potential tumor behavior.展开更多
Patients undergoing Roux-en-Y gastric bypass(RYGB)surgery elicit striking loss of body weight. Anatomical restructuring of the gastrointestinal(GI) tract, leading to reduced caloric intake and changes in food preferen...Patients undergoing Roux-en-Y gastric bypass(RYGB)surgery elicit striking loss of body weight. Anatomical restructuring of the gastrointestinal(GI) tract, leading to reduced caloric intake and changes in food preference, are thought to be the primary drivers of weight loss in bariatric surgery patients. However, the mechanisms by which RYGB surgery causes a reduced preference for fatty foods remain elusive. In a recent report, Hankir et al described how RYGB surgery modulated lipid nutrient signals in the intestine of rats to blunt their craving for fatty food. The authors reported that RYGB surgery restored an endogenous fat-satiety signaling pathway, mediated via oleoylethanolamide(OEA), that was greatly blunted in obese animals. In RYGB rats, high fat diet(HFD) led to increased production of OEA that activated the intestinal peroxisome proliferation activator receptors-α(PPARα). In RYGB rats, activation of PPARα by OEA was accompanied by enhanced dopamine neurotransmission in the dorsal striatum and reduced preference for HFD. The authors showed that OEA-mediated signals to the midbrain were transmitted via the vagus nerve. Interfering with either the production of OEA in enterocytes, or blocking of vagal and striatal D1 receptors signals eliminated the decreased craving for fat in RYGB rats. These studies demonstrated that bariatric surgery led to alterations in the reward circuitry of the brain in RYGB rats and reduced their preference for HFD.展开更多
Background Cocaine addiction may involve complex neuroadaptations, including many changes of genes expression. Dopamine D3 receptors play an important role in cocaine addiction; however, its role in cocaine induced ge...Background Cocaine addiction may involve complex neuroadaptations, including many changes of genes expression. Dopamine D3 receptors play an important role in cocaine addiction; however, its role in cocaine induced gene expression change is poorly understood. To identify the changes in gene expression induced by repeated cocaine exposure through D3 dopamine receptors, we compared the expression of four molecules： Janus kinase 2 （Jak2）, g-aminobutanoic acid receptor subunit alpha 1 （GABAAα1）, glutamate receptor AMPA3 alpha 3 （GluR 3） and stromal cell derived factor 1 （SDF1）. These four have been implicated in mediating the actions of cocaine in the nucleus accumbens （NAc） and caudoputamen （CPu） in mice after acute and repeated cocaine exposure. Methods For the acute and repeated injections, the mice were divided into four groups： 30 mg/kg cocaine, nafadotride 0.5 mg/kg ＋ cocaine 30 mg/kg, nafadotride 0.5 mg/kg, and saline as the basal group. The expression of Jak2, GABAAα1, GluR 3 and SDF1 were assayed by Western blot, quantitative real-time RT-PCR and immunohistochemistry. Results Twenty-four hours after seven consecutive days of repeated cocaine exposure, the expression of GABAAα1 decreased in cocaine group compared with basal line and further decreased in the cocaine ＋ nafadotride group and remained at basal level in the nafadotride group. Similarly, the Jak2 expression decreased in cocaine group compared with base line. However, the levels of Jak2 increased in cocaine ＋ nafadotride group compared with cocaine group, while remained at basal level in nafadotride group. Conclusions GABAAα1 and Jak2 may be involved in chronic cocaine induced neuroadaptations. D3 dopamine receptors play an important role in the expression of these genes.展开更多
目的构建携带C57BL/6小鼠雌激素受体α(estrogen receptorα,Erα)的重组慢病毒,感染原代培养的小鼠神经细胞,观察是否能提高Erα的表达,为进一步研究Erα与神经系统疾病的关系奠定基础。方法将Erα基因片段插入慢病毒主体载体LV-GFP-fl...目的构建携带C57BL/6小鼠雌激素受体α(estrogen receptorα,Erα)的重组慢病毒,感染原代培养的小鼠神经细胞,观察是否能提高Erα的表达,为进一步研究Erα与神经系统疾病的关系奠定基础。方法将Erα基因片段插入慢病毒主体载体LV-GFP-flag,构建重组慢病毒载体LV-Erα-flag。通过琼脂糖凝胶电泳(agarose gel electrophoresis,AGE)、基因测序验证后,将LV-Erα-flag与包装质粒pHelper1.0、pHelper2.0共同转染293T细胞,测定病毒滴度,获得携带Erα基因的重组慢病毒V-Erα-flag。无血清培养C57BL/6小鼠的神经细胞,对照病毒V-GFP-flag感染神经细胞,在荧光显微镜下每天观察荧光表达情况,用流式细胞仪检测感染效率和凋亡率以获得最佳感染复数(multiplicity of infection,MOI)。然后用最佳MOI值的重组慢病毒V-Erα-flag感染神经细胞,采用实时定量PCR、蛋白质印迹方法检测感染后细胞中Erα的转录和蛋白表达水平。结果 AGE及测序鉴定均表明重组慢病毒载体构建成功,包装、扩增后得到V-Erα-flag,感染滴度为2×108 TU/ml;MOI=5的对照病毒V-GFP-flag能感染神经细胞,感染效率达(89.8±4.03)%,而凋亡率仅为(3.6±0.29)%。神经细胞至少能存活8周,在此期间GFP能持续表达,说明慢病毒能有效而稳定感染神经细胞。用MOI=5的V-Erα-flag感染神经细胞后,能显著增强神经细胞中的ErαmRNA和蛋白表达水平。结论成功构建了携带Erα基因的重组慢病毒,其能成功感染神经细胞,使ErαmRNA和蛋白表达水平增高。展开更多
基金the grant from the National Natural Science Foundation of China
文摘Background： Systemic lupus eiLythenaatosus （SLE） is a prototypic autoimmune disease wida complex genetic inheritance. This study was conducted to examine whether the association ofa proliferation-inducing ligand （APRIL）, spermatogenesis associated 8 （SPATA8）, platelet-derived growth lhctor receptor-alpha （PDGFRA）, and DNA polymerase beta （POLB） with SLE can be replicated in a Chinese Han population. Methods： Chinese SLE patients （n = 1247） and ethnically and geographically matched healthy controls （n 1440） were genotyped for the APRI L, SPATAS. PDGFRA, and POLB single-nucleotide polymorphisms （SN Ps）, rs3803800 rs8023715, rs1364089 and rsl2678588 using the Sequenom MassARRAY System. Results： The Chinese Hart SLE patients and controls had statistically similar liequencies of alleles and genotypes of four gene polynlorphisms. Moreover, no association signal was detected on different genetic models （additive, dominant, and recessive, all, P〉 0.05） or in SLE subgroups stratified by various clinical nlanifestations （all, P 〉 0.05）. Conclusions： Different genetic backgrounds from different ancestries and various populations may result in different genetic risk litctors for SLE. We did not detect any significant association with SNPs of APRIL SPATAS, PDGFRA, and POLB.
基金This work was supported by a grant from the National Natural Science Foundation of China （No. 30600588）.
文摘Background Estrogen receptor （ER）-negative breast cancer cells are more aggressive than ER-positive cells. Elevated levels of cyclooxygenase-2 （COX-2） and vascular endothelial growth factor-C （VEGF-C） expression have been detected in cultured human breast cancer cells and are associated with negative hormone receptor status. In this study, we created ERα stable transfectants in MDA-MB-231 cells to explore the effect of ERα on cell growth and COX-2 and VEGF-C expression.Methods The green fluorescent protein （GFP）-ERα plasmids were stably transfected into ER-negative MDA-MB-231 cells. The proliferation and migration of untransfected MDA-MB-231 cells, ERα-transfected MDA-MB-231 cells and ER-positive MCF-7 cells were determined. The expression of COX-2, and the levels of VEGF-C mRNA and the VEGF-C secretion concentration were assayed in these cell lines.Results The proliferation and migration capacities of ERα-tranfected MDA-MB-231 cells were significantly decreased （P 〈0.05）. The expression of COX-2 was significantly lower in ERa-tranfected MDA-MB-231 cells than in untranfected MDA-MB-231 cells. The mRNA and protein levels of VEGF-C were lower in ERa-tranfected MDA-MB-231 cells than in untransfected MDA-MB-231 cells （P〈0.05）.Conclusions ERα stable transfection inhibits proliferation and migration capacities of MDA-MB-231 cells and decreases expression of COX-2 and VEGF-C. The decreases of proliferation and migration capacities may be related to suppression of COX-2 and VEGF-C expression.
文摘Pharmacophore is a commonly used method for molecular simulation, including ligand-based pharmacophore （LBP） and structure-based pharmacophore （SBP）. LBP can be utilized to identify active compounds usual with lower accuracy, and SBP is able to use for distin- guishing active compounds from inactive compounds with frequently higher missing rates. Merged pharmacophore （MP） is presented to integrate advantages and avoid shortcomings of LBP and SBP. In this work, LBP and SBP models were constructed for the study of per- oxisome proliferator receptor-alpha （PPARα） agonists. According to the comparison of the two types of pharmacophore models, mainly and secondarily pharmacological features were identified. The weight and tolerance values of these pharmacological features were adjusted to construct MP models by single-factor explorations and orthogonal experimental design based on SBP model. Then, the reliability and screening efficiency of the best MP model were validated by three databases. The best MP model was utilized to compute PPARα activity of compounds from traditional Chinese medicine. The screening efficiency of MP model outperformed individual LBP or SBP model for PPARα agonists, and was similar to combinatorial screening of LBP and SBP. However, MP model might have an advantage over the combination of LBP and SBP in evaluating the activity of compounds and avoiding the inconsistent prediction of LBP and SBP, which would be beneficial to guide drug design and optimization.
基金Supported by Coordena??o de Aperfei?oamento de Pessoal de Nível Superior–Brasil,No. CAPES–Finance Code 001Funda??o Carlos Chagas Filho de Amparo à Pesquisa do Rio de Janeiro (FAPERJ) to Souza-Mello V,No. E-26/202.657/2018 and No. E-26/010.002136/2019supported by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq),No. 303785/2020-9
文摘BACKGROUND Obesity and comorbidities onset encompass gut dysbiosis,altered intestinal permeability,and endotoxemia.Treatments that target gut dysbiosis can cope with obesity and nonalcoholic fatty liver disease(NAFLD)management.Peroxisome proliferator-activated receptor(PPAR)-alpha activation and dipeptidyl-peptidase-4(DPP-4)inhibition alleviate NAFLD,but the mechanism may involve gut microbiota modulation and merits further investigation.AIM To address the effects of PPAR-alpha activation and DPP-4 inhibition(isolated or combined)upon the gut-liver axis,emphasizing inflammatory pathways in NAFLD management in high-fat-fed C57BL/6J mice.METHODS Male C57BL/6J mice were fed a control diet(C,10%of energy as lipids)or a highfat diet(HFD,50%of energy as lipids)for 12 wk,when treatments started,forming the groups:C,HF,HFA(HFD+PPAR-alpha agonist WY14643,2.5 mg/kg body mass),HFL(HFD+DPP-4 inhibitor linagliptin,15 mg/kg body mass),and HFC(HFD+the combination of WY14643 and linagliptin).RESULTS The HFD was obesogenic compared to the C diet.All treatments elicited significant body mass loss,and the HFC group showed similar body mass to the C group.All treatments tackled oral glucose intolerance and raised plasma glucagon-like peptide-1 concentrations.These metabolic benefits restored Bacteroidetes/Firmicutes ratio,resulting in increased goblet cells per area of the large intestine and reduced lipopolysaccharides concentrations in treated groups.At the gene level,treated groups showed higher intestinal Mucin 2,Occludin,and Zo-1 expression than the HFD group.The reduced endotoxemia suppressed inflammasome and macrophage gene expression in the liver of treated animals.These observations complied with the mitigation of liver steatosis and reduced hepatic triacylglycerol,reassuring the role of the proposed treatments on NAFLD mitigation.CONCLUSION PPAR alpha activation and DPP-4 inhibition(isolated or combined)tackled NAFLD in dietinduced obese mice by restoration of gut-liver axis.The reestablishment of the intestinal barrier a
文摘Gastrointestinal stromal tumors(GISTs)represent a malignant gastrointestinal tumor of neurofibromatosis type 1(NF1)Von Recklinghausen disease.In the current case,we report a 27-year-old woman with NF1,who presented with a lower abdominal mass,symptomatic anaemia,and significant weight loss.We employed multiple approaches to assess the tumor behavior,including computed tomography(CT)scan,surgical tumor resection,histological and immunohistochemical analysis and gene sequencing.Additionally,the patient was given Imatinib mesylate(Gleevec)as adjuvant therapy.CT scan delineated a large thick wall cavity lesion connecting to the small bowel segment.Resection of the tumor yielded a mass of 17 cm×13 cm with achievement of safety margins.The diagnosis was GIST,confirmed by immunohistochemical expression of CD117,CD34,and Bcl-2.Sequencing revealed no mutations in either KIT or platelet-derived growth factor receptor-alpha,genes which are mutated in over 85%of sporadic GIST cases.Further,there was no evidence of recurrence,metastasis or metachronous GIST for over three years in our patient.From our analyses,we believe selective genotyping is advisable for high risk patients to predict potential tumor behavior.
文摘Patients undergoing Roux-en-Y gastric bypass(RYGB)surgery elicit striking loss of body weight. Anatomical restructuring of the gastrointestinal(GI) tract, leading to reduced caloric intake and changes in food preference, are thought to be the primary drivers of weight loss in bariatric surgery patients. However, the mechanisms by which RYGB surgery causes a reduced preference for fatty foods remain elusive. In a recent report, Hankir et al described how RYGB surgery modulated lipid nutrient signals in the intestine of rats to blunt their craving for fatty food. The authors reported that RYGB surgery restored an endogenous fat-satiety signaling pathway, mediated via oleoylethanolamide(OEA), that was greatly blunted in obese animals. In RYGB rats, high fat diet(HFD) led to increased production of OEA that activated the intestinal peroxisome proliferation activator receptors-α(PPARα). In RYGB rats, activation of PPARα by OEA was accompanied by enhanced dopamine neurotransmission in the dorsal striatum and reduced preference for HFD. The authors showed that OEA-mediated signals to the midbrain were transmitted via the vagus nerve. Interfering with either the production of OEA in enterocytes, or blocking of vagal and striatal D1 receptors signals eliminated the decreased craving for fat in RYGB rats. These studies demonstrated that bariatric surgery led to alterations in the reward circuitry of the brain in RYGB rats and reduced their preference for HFD.
基金the grants from the Science Technology Research Project fo Guangdong Province[Mo.2005B50301010]the Natural Science Foundation of Guangdong Province[No 40204411 and.06024380]the Medical Science Research Foundation of Guangdong Province[No.A200537]
文摘Background Cocaine addiction may involve complex neuroadaptations, including many changes of genes expression. Dopamine D3 receptors play an important role in cocaine addiction; however, its role in cocaine induced gene expression change is poorly understood. To identify the changes in gene expression induced by repeated cocaine exposure through D3 dopamine receptors, we compared the expression of four molecules： Janus kinase 2 （Jak2）, g-aminobutanoic acid receptor subunit alpha 1 （GABAAα1）, glutamate receptor AMPA3 alpha 3 （GluR 3） and stromal cell derived factor 1 （SDF1）. These four have been implicated in mediating the actions of cocaine in the nucleus accumbens （NAc） and caudoputamen （CPu） in mice after acute and repeated cocaine exposure. Methods For the acute and repeated injections, the mice were divided into four groups： 30 mg/kg cocaine, nafadotride 0.5 mg/kg ＋ cocaine 30 mg/kg, nafadotride 0.5 mg/kg, and saline as the basal group. The expression of Jak2, GABAAα1, GluR 3 and SDF1 were assayed by Western blot, quantitative real-time RT-PCR and immunohistochemistry. Results Twenty-four hours after seven consecutive days of repeated cocaine exposure, the expression of GABAAα1 decreased in cocaine group compared with basal line and further decreased in the cocaine ＋ nafadotride group and remained at basal level in the nafadotride group. Similarly, the Jak2 expression decreased in cocaine group compared with base line. However, the levels of Jak2 increased in cocaine ＋ nafadotride group compared with cocaine group, while remained at basal level in nafadotride group. Conclusions GABAAα1 and Jak2 may be involved in chronic cocaine induced neuroadaptations. D3 dopamine receptors play an important role in the expression of these genes.
文摘目的构建携带C57BL/6小鼠雌激素受体α(estrogen receptorα,Erα)的重组慢病毒,感染原代培养的小鼠神经细胞,观察是否能提高Erα的表达,为进一步研究Erα与神经系统疾病的关系奠定基础。方法将Erα基因片段插入慢病毒主体载体LV-GFP-flag,构建重组慢病毒载体LV-Erα-flag。通过琼脂糖凝胶电泳(agarose gel electrophoresis,AGE)、基因测序验证后,将LV-Erα-flag与包装质粒pHelper1.0、pHelper2.0共同转染293T细胞,测定病毒滴度,获得携带Erα基因的重组慢病毒V-Erα-flag。无血清培养C57BL/6小鼠的神经细胞,对照病毒V-GFP-flag感染神经细胞,在荧光显微镜下每天观察荧光表达情况,用流式细胞仪检测感染效率和凋亡率以获得最佳感染复数(multiplicity of infection,MOI)。然后用最佳MOI值的重组慢病毒V-Erα-flag感染神经细胞,采用实时定量PCR、蛋白质印迹方法检测感染后细胞中Erα的转录和蛋白表达水平。结果 AGE及测序鉴定均表明重组慢病毒载体构建成功,包装、扩增后得到V-Erα-flag,感染滴度为2×108 TU/ml;MOI=5的对照病毒V-GFP-flag能感染神经细胞,感染效率达(89.8±4.03)%,而凋亡率仅为(3.6±0.29)%。神经细胞至少能存活8周,在此期间GFP能持续表达,说明慢病毒能有效而稳定感染神经细胞。用MOI=5的V-Erα-flag感染神经细胞后,能显著增强神经细胞中的ErαmRNA和蛋白表达水平。结论成功构建了携带Erα基因的重组慢病毒,其能成功感染神经细胞,使ErαmRNA和蛋白表达水平增高。
