Tamoxifen citrate (TAM) has been used to treat breast cancer in women for many years. The com-parative effects of TAM in inducing apoptosis were evaluated in estrogen receptor-positive (ER- positive MCF-7) and estroge...Tamoxifen citrate (TAM) has been used to treat breast cancer in women for many years. The com-parative effects of TAM in inducing apoptosis were evaluated in estrogen receptor-positive (ER- positive MCF-7) and estrogen receptor-negative (ER-negative MDA-MB-231) human breast cancer cell lines in vitro in order to determine if these two cell lines differ in their sensitivity to TAM. Mi-tochondrial membrane permeability potential disruption was assessed in both cell lines by a lip-ophilic cationic dye (DePsipher assay, Trevigen, Inc.) utilizing fluorescence microscopy. Using this specific fluorochrome, we were able to associate mitochondrial membrane disruption to early, mid-, and late apoptotic cells. TAM induced cell death via apoptosis in both ER-positive and ER- negative cells, however, apoptosis induction was more pronounced in ER-positive MCF-7 compared to ER-negative MDA-MB-231 breast cancer cells. These findings may have some therapeutic use in the treatment of estrogen dependent and estrogen independent breast cancer.展开更多
Synthetic phosphoethanolamine(Pho-s)is a monophosphoester ester with anti-inflammatory and pro-apoptotic properties.Meclizine chloridrate(MC)is a histamine H1 receptor blocker that is also able to inhibit cellular res...Synthetic phosphoethanolamine(Pho-s)is a monophosphoester ester with anti-inflammatory and pro-apoptotic properties.Meclizine chloridrate(MC)is a histamine H1 receptor blocker that is also able to inhibit cellular respiration.However,MC does not inhibit cellular respiration in isolated mitochondria such as antimycin and rotenone.Methyl-β-cyclodextrin(MβCD)belongs to theβ-cyclodextrin family,which is capable of removing cholesterol from the plasma membrane.The aim of this study was to evaluate the proliferative effects of meclizine chloridrate and methyl-β-cyclodextrin compounds associated with synthetic phosphoethanolamine in a triple-negative human breast tumor line,MDA-MB-231 Cell viability of the tumor line and normal cells FN1 was evaluated by MTT colorimetric test;the production of free radicals was determined by lipoperoxidation(LPO)test;and the percentage of cell cycle phases and proliferative index was evaluated by flow cytometry.Cell viability demonstrated a significant decrease with the treatments of MβCD,MC and Pho-s associated with MC.The production of free radicals decreases significantly in all treatments.In addition,a significant increase of DNA fragment and decrease in G0/G1 cell cycle phase were observed in cellular percentage with concentrations of 20 and 30 mM of Pho-s in association with MC and MβCD,respectively.展开更多
SATB1在乳腺癌的侵袭转移中起到决定性作用,抑制SATB1的表达能够有效地控制乳腺癌的转移。该实验从茯苓中分离纯化得到均一多糖并制备硫酸化衍生物,筛选具有抑制SATB1表达的多糖成分。茯苓经醇提去除小分子成分,水提醇沉后得茯苓粗多糖P...SATB1在乳腺癌的侵袭转移中起到决定性作用,抑制SATB1的表达能够有效地控制乳腺癌的转移。该实验从茯苓中分离纯化得到均一多糖并制备硫酸化衍生物,筛选具有抑制SATB1表达的多糖成分。茯苓经醇提去除小分子成分,水提醇沉后得茯苓粗多糖PPS,PPS经DEAE Sepharose Fast Flow阴离子交换树脂分离和Superdex-75系列凝胶纯化后得PPSW-1,并对PPSW-1进行结构分析、硫酸衍生化和抑制人乳腺癌MDA-MB-231细胞迁移作用考察。结果显示从茯苓中得到一种具有抑制人乳腺癌MDA-MB-231细胞迁移作用的均一多糖PPSW-1,相对分子质量为3. 06×104,结构为1,3连接α-D-半乳聚糖为主链,1,6连接α-D-半乳聚糖为支链的多糖,PPSW-1表现出较强的抑制细胞迁移的作用,经硫酸衍生化后产物Sul-W-1活性较PPSW-1并未有明显的增强,但水溶性有明显增加,并且发现茯苓多糖及其硫酸化衍生物能抑制SATB1的表达。该研究从茯苓中成功分离到具有抑制人乳腺癌MDA-MB-231细胞迁移作用的均一多糖,并经过硫酸衍生化得到活性不变溶解性更好的多糖,该发现为茯苓多糖及其衍生物的抗乳腺癌研究提供依据。展开更多
文摘Tamoxifen citrate (TAM) has been used to treat breast cancer in women for many years. The com-parative effects of TAM in inducing apoptosis were evaluated in estrogen receptor-positive (ER- positive MCF-7) and estrogen receptor-negative (ER-negative MDA-MB-231) human breast cancer cell lines in vitro in order to determine if these two cell lines differ in their sensitivity to TAM. Mi-tochondrial membrane permeability potential disruption was assessed in both cell lines by a lip-ophilic cationic dye (DePsipher assay, Trevigen, Inc.) utilizing fluorescence microscopy. Using this specific fluorochrome, we were able to associate mitochondrial membrane disruption to early, mid-, and late apoptotic cells. TAM induced cell death via apoptosis in both ER-positive and ER- negative cells, however, apoptosis induction was more pronounced in ER-positive MCF-7 compared to ER-negative MDA-MB-231 breast cancer cells. These findings may have some therapeutic use in the treatment of estrogen dependent and estrogen independent breast cancer.
文摘Synthetic phosphoethanolamine(Pho-s)is a monophosphoester ester with anti-inflammatory and pro-apoptotic properties.Meclizine chloridrate(MC)is a histamine H1 receptor blocker that is also able to inhibit cellular respiration.However,MC does not inhibit cellular respiration in isolated mitochondria such as antimycin and rotenone.Methyl-β-cyclodextrin(MβCD)belongs to theβ-cyclodextrin family,which is capable of removing cholesterol from the plasma membrane.The aim of this study was to evaluate the proliferative effects of meclizine chloridrate and methyl-β-cyclodextrin compounds associated with synthetic phosphoethanolamine in a triple-negative human breast tumor line,MDA-MB-231 Cell viability of the tumor line and normal cells FN1 was evaluated by MTT colorimetric test;the production of free radicals was determined by lipoperoxidation(LPO)test;and the percentage of cell cycle phases and proliferative index was evaluated by flow cytometry.Cell viability demonstrated a significant decrease with the treatments of MβCD,MC and Pho-s associated with MC.The production of free radicals decreases significantly in all treatments.In addition,a significant increase of DNA fragment and decrease in G0/G1 cell cycle phase were observed in cellular percentage with concentrations of 20 and 30 mM of Pho-s in association with MC and MβCD,respectively.
文摘SATB1在乳腺癌的侵袭转移中起到决定性作用,抑制SATB1的表达能够有效地控制乳腺癌的转移。该实验从茯苓中分离纯化得到均一多糖并制备硫酸化衍生物,筛选具有抑制SATB1表达的多糖成分。茯苓经醇提去除小分子成分,水提醇沉后得茯苓粗多糖PPS,PPS经DEAE Sepharose Fast Flow阴离子交换树脂分离和Superdex-75系列凝胶纯化后得PPSW-1,并对PPSW-1进行结构分析、硫酸衍生化和抑制人乳腺癌MDA-MB-231细胞迁移作用考察。结果显示从茯苓中得到一种具有抑制人乳腺癌MDA-MB-231细胞迁移作用的均一多糖PPSW-1,相对分子质量为3. 06×104,结构为1,3连接α-D-半乳聚糖为主链,1,6连接α-D-半乳聚糖为支链的多糖,PPSW-1表现出较强的抑制细胞迁移的作用,经硫酸衍生化后产物Sul-W-1活性较PPSW-1并未有明显的增强,但水溶性有明显增加,并且发现茯苓多糖及其硫酸化衍生物能抑制SATB1的表达。该研究从茯苓中成功分离到具有抑制人乳腺癌MDA-MB-231细胞迁移作用的均一多糖,并经过硫酸衍生化得到活性不变溶解性更好的多糖,该发现为茯苓多糖及其衍生物的抗乳腺癌研究提供依据。
