Objective To screen the transient and stable cell lines with high production of Nectin-like 4(Necl-4)protein.Methods First,c DNA sequences encoding the extracellular domain of Necls were cloned into the modified vecto...Objective To screen the transient and stable cell lines with high production of Nectin-like 4(Necl-4)protein.Methods First,c DNA sequences encoding the extracellular domain of Necls were cloned into the modified vector p APtag at the N terminus of alkaline phosphatase(AP)for fusion expression.Next,293ET cells stably expressed Necls-AP fusion protein and secreted it into the culture medium which were detected by the AP activity assay and Western blot analysis.Then,by adding N-glycosylation processing inhibitor kifunensine into the medium,complex glycan was inhibited to generate.The residual glycan of purified protein was removed by endoglycosidase H.Finally,AP protein was removed by using human rhinovirus protease and size exclusion chromatography.The concentration of purified Necl-4 protein was monitored by measuring the absorbance at280 nm and analyzed by SDS-PAGE.Results The transient and stable cell lines with high production of Necl-4 protein were screened by the color reaction with the AP-tag in the recombinant vector.The soluble and active form of purified Necl-4 protein was obtained after deglycosylation of native N-glycan protein with an expression level of 4 mg/L culture and purity of 95%.Conclusions By using modified AP mammalian protein expression system,we can easily screen the high productive stable cell lines by using AP activity assay.By adding mannosidase inhibitor kifunensine into the medium and cutting purified protein by using endoglycosidase H,we can obtain deglycosylated Necl-4 protein in milligram quantities.Our method might throw a light on the expression and purification of glycoprotein for structural and functional studies.展开更多
目的 :观察免疫球蛋白A(immunoglobulin A, IgA)肾病患者血清外泌体中炎症小体NOD样受体热蛋白结构域相关蛋白3(NOD-like receptor thermal protein domain associated protein 3, NLRP3)的表达变化,分析其与疾病严重程度的相关性。方法...目的 :观察免疫球蛋白A(immunoglobulin A, IgA)肾病患者血清外泌体中炎症小体NOD样受体热蛋白结构域相关蛋白3(NOD-like receptor thermal protein domain associated protein 3, NLRP3)的表达变化,分析其与疾病严重程度的相关性。方法:选取2018年1月—2019年12月在南通大学附属医院肾活检为原发性IgA肾病患者60例,根据肾脏病理Katafuchi积分分为4组:0~3分17例、4~6分19例、7~9分15例、10~12分9例;另选择因肾良性肿瘤行手术切除患者15例为对照组。收集IgA肾病患者血清外泌体,免疫组化试剂盒检测外泌体中NLRP3的表达,Pearson相关分析法分析血清外泌体NLRP3的表达与Katafuchi积分、24 h尿蛋白定量、内生肌酐清除率的相关性,并分析血清外泌体NLRP3的表达与肾组织内NLRP3表达的相关性。结果 :IgA肾病患者血清外泌体中NLRP3的表达明显高于对照组(P<0.05),其表达水平与蛋白尿、Katafuchi积分呈正相关(P<0.05),与内生肌酐清除率呈负相关(P<0.05)。IgA肾病患者肾脏组织内NLRP3的表达较对照组明显升高(P<0.05),且与血清外泌体中NLRP3的表达呈正相关(P<0.05)。结论:IgA肾病患者血清外泌体中NLRP3的表达与疾病的严重程度呈正相关,可能参与疾病的发生及发展。展开更多
Oligodencrocytes（OLs） are the main glial cells of the central nervous system involved in myelination of axons. In multiple sclerosis（MS）, there is an imbalance between demyelination and remyelination processes, th...Oligodencrocytes（OLs） are the main glial cells of the central nervous system involved in myelination of axons. In multiple sclerosis（MS）, there is an imbalance between demyelination and remyelination processes, the last one performed by oligodendrocyte progenitor cells（OPCs） and OLs, resulting into a permanent demyelination, axonal damage and neuronal loss. In MS lesions, astrocytes and microglias play an important part in permeabilization of blood-brain barrier and initiation of OPCs proliferation. Migration and differentiation of OPCs are influenced by various factors and the process is finalized by insufficient acummulation of OLs into the MS lesion. In relation to all these processes, the author will discuss the potential targets for remyelination strategies.展开更多
基金Supported by grants of the National Natural Science Foundation of China(31071203,31370789,31670789,and 31671316)
文摘Objective To screen the transient and stable cell lines with high production of Nectin-like 4(Necl-4)protein.Methods First,c DNA sequences encoding the extracellular domain of Necls were cloned into the modified vector p APtag at the N terminus of alkaline phosphatase(AP)for fusion expression.Next,293ET cells stably expressed Necls-AP fusion protein and secreted it into the culture medium which were detected by the AP activity assay and Western blot analysis.Then,by adding N-glycosylation processing inhibitor kifunensine into the medium,complex glycan was inhibited to generate.The residual glycan of purified protein was removed by endoglycosidase H.Finally,AP protein was removed by using human rhinovirus protease and size exclusion chromatography.The concentration of purified Necl-4 protein was monitored by measuring the absorbance at280 nm and analyzed by SDS-PAGE.Results The transient and stable cell lines with high production of Necl-4 protein were screened by the color reaction with the AP-tag in the recombinant vector.The soluble and active form of purified Necl-4 protein was obtained after deglycosylation of native N-glycan protein with an expression level of 4 mg/L culture and purity of 95%.Conclusions By using modified AP mammalian protein expression system,we can easily screen the high productive stable cell lines by using AP activity assay.By adding mannosidase inhibitor kifunensine into the medium and cutting purified protein by using endoglycosidase H,we can obtain deglycosylated Necl-4 protein in milligram quantities.Our method might throw a light on the expression and purification of glycoprotein for structural and functional studies.
文摘目的 :观察免疫球蛋白A(immunoglobulin A, IgA)肾病患者血清外泌体中炎症小体NOD样受体热蛋白结构域相关蛋白3(NOD-like receptor thermal protein domain associated protein 3, NLRP3)的表达变化,分析其与疾病严重程度的相关性。方法:选取2018年1月—2019年12月在南通大学附属医院肾活检为原发性IgA肾病患者60例,根据肾脏病理Katafuchi积分分为4组:0~3分17例、4~6分19例、7~9分15例、10~12分9例;另选择因肾良性肿瘤行手术切除患者15例为对照组。收集IgA肾病患者血清外泌体,免疫组化试剂盒检测外泌体中NLRP3的表达,Pearson相关分析法分析血清外泌体NLRP3的表达与Katafuchi积分、24 h尿蛋白定量、内生肌酐清除率的相关性,并分析血清外泌体NLRP3的表达与肾组织内NLRP3表达的相关性。结果 :IgA肾病患者血清外泌体中NLRP3的表达明显高于对照组(P<0.05),其表达水平与蛋白尿、Katafuchi积分呈正相关(P<0.05),与内生肌酐清除率呈负相关(P<0.05)。IgA肾病患者肾脏组织内NLRP3的表达较对照组明显升高(P<0.05),且与血清外泌体中NLRP3的表达呈正相关(P<0.05)。结论:IgA肾病患者血清外泌体中NLRP3的表达与疾病的严重程度呈正相关,可能参与疾病的发生及发展。
文摘Oligodencrocytes（OLs） are the main glial cells of the central nervous system involved in myelination of axons. In multiple sclerosis（MS）, there is an imbalance between demyelination and remyelination processes, the last one performed by oligodendrocyte progenitor cells（OPCs） and OLs, resulting into a permanent demyelination, axonal damage and neuronal loss. In MS lesions, astrocytes and microglias play an important part in permeabilization of blood-brain barrier and initiation of OPCs proliferation. Migration and differentiation of OPCs are influenced by various factors and the process is finalized by insufficient acummulation of OLs into the MS lesion. In relation to all these processes, the author will discuss the potential targets for remyelination strategies.
