Capillary zone electrophoresis(CZE) has been used for the enantiomeric separation of isoprenaline.β cyclodextrin(β CD) and HP β CD were used as the chiral selectors and several factors influcing the separating reso...Capillary zone electrophoresis(CZE) has been used for the enantiomeric separation of isoprenaline.β cyclodextrin(β CD) and HP β CD were used as the chiral selectors and several factors influcing the separating resolution were discussed.展开更多
目的:采用毛细管区带电泳法(Capillary Zone Electrophoresis,CZE),利用β-环糊精(β-cyclodextrin,β-CD)和羟丙基-β-环糊精(Hydroxypropyl-β-cyclodextrin,HP-β-CD)作为手性添加剂,拆分肾上腺素(Epinephrine)手性对映体,并检测市...目的:采用毛细管区带电泳法(Capillary Zone Electrophoresis,CZE),利用β-环糊精(β-cyclodextrin,β-CD)和羟丙基-β-环糊精(Hydroxypropyl-β-cyclodextrin,HP-β-CD)作为手性添加剂,拆分肾上腺素(Epinephrine)手性对映体,并检测市售盐酸肾上腺素注射液的手性状况。方法:通过对缓冲液体系、酸碱性以及β-CD和HP-β-CD的比较研究,得到优化的分离条件,即50mmol/L的Tris-H3PO4(用磷酸调pH为2.42),含40mmol/L的HP-β-CD,二极管阵列检测器检测,监视波长214nm,分离电压30kV,分离温度25℃,分离时间15min,压力进样5s。结果:肾上腺素((±)-Epinephrine)手性对映体在HP-β-CD体系中获得了完全的拆分,而β-CD对其没有拆分效果。检测发现市售的盐酸肾上腺素注射液为单一手性化合物。结论:毛细管区带电泳结合HP-β-CD手性添加剂可以有效的拆分肾上腺素手性对映体,并可作为检测产品纯度的有效方法。展开更多
Marginal zone(MZ)B cells,which are splenic innate-like B cells that rapidly secrete antibodies(Abs)against blood-borne pathogens,are composed of heterogeneous subpopulations.Here,we showed that MZ B cells can be divid...Marginal zone(MZ)B cells,which are splenic innate-like B cells that rapidly secrete antibodies(Abs)against blood-borne pathogens,are composed of heterogeneous subpopulations.Here,we showed that MZ B cells can be divided into two distinct subpopulations according to their CD80 expression levels.CD80^(high)MZ B cells exhibited greater Ab-producing,proliferative,and IL-10-secreting capacities than did CD80^(low)MZ B cells.Notably,CD80^(high)MZ B cells survived 2-Gy whole-body irradiation,whereas CD80^(low)MZ B cells were depleted by irradiation and then repleted with one month after irradiation.Depletion of CD80^(low)MZ B cells led to accelerated development of type II collagen(CII)-induced arthritis upon immunization with bovine CII.CD80^(high)MZ B cells exhibited higher expression of genes involved in proliferation,plasma cell differentiation,and the antioxidant response.CD80^(high)MZ B cells expressed more autoreactive B cell receptors(BCRs)that recognized double-stranded DNA or CII,expressed more immunoglobulin heavy chain sequences with shorter complementarity-determining region 3 sequences,and included more clonotypes with no N-nucleotides or with B-1a BCR sequences than CD80^(low)MZ B cells.Adoptive transfer experiments showed that CD21^(+)CD23^(+)transitional 2 MZ precursors preferentially generated CD80^(low)MZ B cells and that a proportion of CD80^(low)MZ B cells were converted into CD80^(high)MZ B cells;in contrast,CD80^(high)MZ B cells stably remained CD80^(high)MZ B cells.In summary,MZ B cells can be divided into two subpopulations according to their CD80 expression levels,Ab-producing capacity,radioresistance,and autoreactivity,and these findings may suggest a hierarchical composition of MZ B cells with differential stability and BCR specificity.展开更多
AIM: To investigate how t(11;18)(q21;q21)-positive gastrointestinal MALT lymphomas relate to other marginal zone lymphomas with respect to the somatic mutation pattern of the VH genes and the expression of the marker ...AIM: To investigate how t(11;18)(q21;q21)-positive gastrointestinal MALT lymphomas relate to other marginal zone lymphomas with respect to the somatic mutation pattern of the VH genes and the expression of the marker CD27. METHODS: The VH gene of 7 t(11;18)(q21;q21)-positive gastrointestinal MALT lymphomas was amplif iedby PCR using family specif ic VH primers and a consensus JH primer. PCR products were sequenced and mutation analysis of the CDR and the FR regions was performed. All cases were immunostained for CD27. RESULTS: One case showed unmutated VH genes while the others showed mutated VH genes with mutation frequencies ranging from 1.3 to 14.7% and with evidence of antigen selection in 2 cases. These data suggest that the translocation t(11;18)(q21;q21) can target either B-cells at different stages of differentiation or naive B-cells that retain the capacity to differentiate upon antigen stimulation. All cases but one displayed weak to strong CD27 expression which did not correlate with the VH gene mutation status. CONCLUSION: t(11;18)(q21;q21)-positive gastro- intestinal MALT lymphomas are heterogeneous with respect to the VH mutation status and CD27 is not a marker of somatically mutated B-cells.展开更多
文摘Capillary zone electrophoresis(CZE) has been used for the enantiomeric separation of isoprenaline.β cyclodextrin(β CD) and HP β CD were used as the chiral selectors and several factors influcing the separating resolution were discussed.
文摘目的:采用毛细管区带电泳法(Capillary Zone Electrophoresis,CZE),利用β-环糊精(β-cyclodextrin,β-CD)和羟丙基-β-环糊精(Hydroxypropyl-β-cyclodextrin,HP-β-CD)作为手性添加剂,拆分肾上腺素(Epinephrine)手性对映体,并检测市售盐酸肾上腺素注射液的手性状况。方法:通过对缓冲液体系、酸碱性以及β-CD和HP-β-CD的比较研究,得到优化的分离条件,即50mmol/L的Tris-H3PO4(用磷酸调pH为2.42),含40mmol/L的HP-β-CD,二极管阵列检测器检测,监视波长214nm,分离电压30kV,分离温度25℃,分离时间15min,压力进样5s。结果:肾上腺素((±)-Epinephrine)手性对映体在HP-β-CD体系中获得了完全的拆分,而β-CD对其没有拆分效果。检测发现市售的盐酸肾上腺素注射液为单一手性化合物。结论:毛细管区带电泳结合HP-β-CD手性添加剂可以有效的拆分肾上腺素手性对映体,并可作为检测产品纯度的有效方法。
基金supported by National Research Foundation of Korea grant funded by the Korea government(MSIT)(2023R1A2C2004510)Korea Basic Science Institute(National Research Facilities and Equipment Center)grant(2020R1A6C101A191)of the Ministry of Education(Korea)the BK21 FOUR Program(Graduate School Innovation)of Sungkyunkwan University.
文摘Marginal zone(MZ)B cells,which are splenic innate-like B cells that rapidly secrete antibodies(Abs)against blood-borne pathogens,are composed of heterogeneous subpopulations.Here,we showed that MZ B cells can be divided into two distinct subpopulations according to their CD80 expression levels.CD80^(high)MZ B cells exhibited greater Ab-producing,proliferative,and IL-10-secreting capacities than did CD80^(low)MZ B cells.Notably,CD80^(high)MZ B cells survived 2-Gy whole-body irradiation,whereas CD80^(low)MZ B cells were depleted by irradiation and then repleted with one month after irradiation.Depletion of CD80^(low)MZ B cells led to accelerated development of type II collagen(CII)-induced arthritis upon immunization with bovine CII.CD80^(high)MZ B cells exhibited higher expression of genes involved in proliferation,plasma cell differentiation,and the antioxidant response.CD80^(high)MZ B cells expressed more autoreactive B cell receptors(BCRs)that recognized double-stranded DNA or CII,expressed more immunoglobulin heavy chain sequences with shorter complementarity-determining region 3 sequences,and included more clonotypes with no N-nucleotides or with B-1a BCR sequences than CD80^(low)MZ B cells.Adoptive transfer experiments showed that CD21^(+)CD23^(+)transitional 2 MZ precursors preferentially generated CD80^(low)MZ B cells and that a proportion of CD80^(low)MZ B cells were converted into CD80^(high)MZ B cells;in contrast,CD80^(high)MZ B cells stably remained CD80^(high)MZ B cells.In summary,MZ B cells can be divided into two subpopulations according to their CD80 expression levels,Ab-producing capacity,radioresistance,and autoreactivity,and these findings may suggest a hierarchical composition of MZ B cells with differential stability and BCR specificity.
基金Supported by A Grant of the "Belgian Cancer Association"the "Fonds voor Wetenschappelijk Onderzoek Vlaanderen"
文摘AIM: To investigate how t(11;18)(q21;q21)-positive gastrointestinal MALT lymphomas relate to other marginal zone lymphomas with respect to the somatic mutation pattern of the VH genes and the expression of the marker CD27. METHODS: The VH gene of 7 t(11;18)(q21;q21)-positive gastrointestinal MALT lymphomas was amplif iedby PCR using family specif ic VH primers and a consensus JH primer. PCR products were sequenced and mutation analysis of the CDR and the FR regions was performed. All cases were immunostained for CD27. RESULTS: One case showed unmutated VH genes while the others showed mutated VH genes with mutation frequencies ranging from 1.3 to 14.7% and with evidence of antigen selection in 2 cases. These data suggest that the translocation t(11;18)(q21;q21) can target either B-cells at different stages of differentiation or naive B-cells that retain the capacity to differentiate upon antigen stimulation. All cases but one displayed weak to strong CD27 expression which did not correlate with the VH gene mutation status. CONCLUSION: t(11;18)(q21;q21)-positive gastro- intestinal MALT lymphomas are heterogeneous with respect to the VH mutation status and CD27 is not a marker of somatically mutated B-cells.
