The bioeffects of silica nanoparticles (SiNP), phosphorylate-terminated nanoparticles (PO4- NP) and amino-terminated nanoparticles (NH2NP) on HaCaT cell line have been studied in this paper. The effects of the three k...The bioeffects of silica nanoparticles (SiNP), phosphorylate-terminated nanoparticles (PO4- NP) and amino-terminated nanoparticles (NH2NP) on HaCaT cell line have been studied in this paper. The effects of the three kinds of functionalized silica nanoparticles on adherence, proliferation and cycle of HaCaT cells have been investigated. And the cel- lular uptake of the three kinds of functionalized silica nanoparticles by HaCaT cells has also been exam- ined. Results indicated that the bioeffects of the three kinds of functionalized nanoparticles on HaCaT cells were concentration-dependent. And the three kinds of functionalized nanoparticles all exhibited well bio- compatibility if the concentration was below 0.2 μg/μL. While the cytotoxicities of the three kinds of function- alized nanoparticles on HaCaT cells would increase with the increasing of nanoparticles concentration, and the following order was observed: NH2NP > SiNP > PO4NP. In addition, the quantity and rapidity of cellular uptake of nanoparticles by HaCaT cells were diverse due to the different functional groups. Under the same conditions, NH2NP was most and fast internalized by HaCaT cells, followed by SiNP, and PO4NP was the least and slowest. These results provided theoretical foundation for the safe applica- tion and further modification of silica nanoparticles, which could broaden the application of silica nano- particles in biomedicine.展开更多
目的观察土茯苓提取物落新妇苷对永生化人角质形成细胞Ha Ca T增殖、凋亡的影响,并探讨其机制。方法收集对数生长期Ha Ca T细胞,观察组分别加入不同浓度落新妇苷、空白对照组加DMEM培养液,培养24 h后,采用MTT法测算细胞增殖抑制率,流式...目的观察土茯苓提取物落新妇苷对永生化人角质形成细胞Ha Ca T增殖、凋亡的影响,并探讨其机制。方法收集对数生长期Ha Ca T细胞,观察组分别加入不同浓度落新妇苷、空白对照组加DMEM培养液,培养24 h后,采用MTT法测算细胞增殖抑制率,流式细胞仪检测细胞早期凋亡率;收集对数生长期Ha Ca T细胞,观察组分别加入不同浓度落新妇苷+20 ng/m L INF-γ、模型对照组加20 ng/m L INF-γ、空白对照组加DMEM培养液培养24 h,采用实时荧光定量PCR法检测细胞中的核转录因子κB(NF-κB)p65、骨桥蛋白(OPN)、血管内皮生长因子(VEGF)mRNA。结果落新妇苷在25、50、100、200、400μg/m L时,Ha Ca T细胞增殖抑制率分别为3.06%、26.53%、40.82%、60.20%及61.22%。落新妇苷在50、100、200μg/m L时,观察组Ha Ca T细胞早期凋亡率分别为3.26%、8.24%和15.38%;与空白对照组早期凋亡率(1.33%)比较,P均<0.05。与空白对照组比较,模型对照组NF-κB p65、OPN、VEGF mRNA表达增加(P均<0.01);与模型对照组比较,观察组随落新妇苷浓度增加,NF-κB p65、OPN、VEGF mRNA表达逐渐降低(P均<0.05)。结论土茯苓提取物落新妇苷能抑制Ha Ca T细胞增殖、诱导细胞凋亡,其机制可能与制抑细胞NF-κB p65、OPN、VEGF mRNA表达有关。展开更多
Applephenon®, a purified extract prepared from green apples, was examined for its cytotoxicity and inhibitory effects on the proliferation of cultures of normal human keratinocytes and several epidermoid cancer...Applephenon®, a purified extract prepared from green apples, was examined for its cytotoxicity and inhibitory effects on the proliferation of cultures of normal human keratinocytes and several epidermoid cancer cell lines. Our HPLC studies demonstrated a high content of phenolic compounds (>65%), including catechin, epicatechin, caffeic acid and phloretin as well as polyphenols such as proanthocyanidins. Applephenon® demonstrated a greater cytotoxic effect against HeLa, A431 cancer cell lines and HaCaT, an immortalized keratinocyte cell line than serum-free cultures of proliferating normal human keratinocytes (NHK). Proliferation of NHK was inhibited at concentrations above 0.0013% while concentrations above 0.005% were cytotoxic. By contrast, Applephenon® solutions above 0.00025% killed each of the cancer cell lines. Treated cells displayed increased intercellular separation and evidence of keratinizing stratification. We also tested the effect of epicatechin, and two isoflavonoids, genistein and daidzein, on cancer cell lines. Hela cells were more sensitive to epicatechin and genistein inhibition of cell growth and cytotoxicity than were NHK. Daidzein at these concentrations had little effect on cancer cells. These results indicate that Applephenon® and some of its phenolic components have selective anticancer activity.展开更多
[目的]构建敲除Toll Like Receptor 4(TLR4)基因的Ha Ca T细胞株,为后续利用该细胞株进行过敏原性研究提供材料。[方法]利用CRISPR/Cas9系统,根据靶向原理设计并合成4条特异性识别TLR4基因的向导RNA(single-molecule guide RNAs,sgRNAs)...[目的]构建敲除Toll Like Receptor 4(TLR4)基因的Ha Ca T细胞株,为后续利用该细胞株进行过敏原性研究提供材料。[方法]利用CRISPR/Cas9系统,根据靶向原理设计并合成4条特异性识别TLR4基因的向导RNA(single-molecule guide RNAs,sgRNAs),构建p X459-sgRNAh TLR4重组质粒,并转入Ha Ca T中,用嘌呤霉素筛选出单克隆阳性细胞。测序确认突变位点,然后利用脂多糖(lipopolysaccharide,LPS)刺激对TLR4进行功能验证来进一步确认敲除效果。[结果]测序结果表明#26单克隆细胞株在靶点附近缺失1 bp,造成TLR4编码基因的移码突变,蛋白翻译提前终止。功能性验证结果表明,在LPS的刺激下,IL-8和CCL20的mRNA水平分别下降约85%和90%,且IL-8的蛋白分泌水平也显著性下调(87%)。[结论]成功构建了敲除TLR4的稳定细胞株,并且验证TLR4的功能缺损。展开更多
基金This work was supported by the Key Project of Natural Science Foundation of China （Grant No. 20135010）National Key Basic Research Program （Grant No. 2002CB513100-10）+2 种基金Key Technologies Research and Development Program （Grant No. 2003 BA310A16）High-Tech Research and Development （863） Program （Grant No. 2003AA302250） the National Natural Science Foundation of China （Grant No. 20405005）.
文摘The bioeffects of silica nanoparticles (SiNP), phosphorylate-terminated nanoparticles (PO4- NP) and amino-terminated nanoparticles (NH2NP) on HaCaT cell line have been studied in this paper. The effects of the three kinds of functionalized silica nanoparticles on adherence, proliferation and cycle of HaCaT cells have been investigated. And the cel- lular uptake of the three kinds of functionalized silica nanoparticles by HaCaT cells has also been exam- ined. Results indicated that the bioeffects of the three kinds of functionalized nanoparticles on HaCaT cells were concentration-dependent. And the three kinds of functionalized nanoparticles all exhibited well bio- compatibility if the concentration was below 0.2 μg/μL. While the cytotoxicities of the three kinds of function- alized nanoparticles on HaCaT cells would increase with the increasing of nanoparticles concentration, and the following order was observed: NH2NP > SiNP > PO4NP. In addition, the quantity and rapidity of cellular uptake of nanoparticles by HaCaT cells were diverse due to the different functional groups. Under the same conditions, NH2NP was most and fast internalized by HaCaT cells, followed by SiNP, and PO4NP was the least and slowest. These results provided theoretical foundation for the safe applica- tion and further modification of silica nanoparticles, which could broaden the application of silica nano- particles in biomedicine.
文摘目的观察土茯苓提取物落新妇苷对永生化人角质形成细胞Ha Ca T增殖、凋亡的影响,并探讨其机制。方法收集对数生长期Ha Ca T细胞,观察组分别加入不同浓度落新妇苷、空白对照组加DMEM培养液,培养24 h后,采用MTT法测算细胞增殖抑制率,流式细胞仪检测细胞早期凋亡率;收集对数生长期Ha Ca T细胞,观察组分别加入不同浓度落新妇苷+20 ng/m L INF-γ、模型对照组加20 ng/m L INF-γ、空白对照组加DMEM培养液培养24 h,采用实时荧光定量PCR法检测细胞中的核转录因子κB(NF-κB)p65、骨桥蛋白(OPN)、血管内皮生长因子(VEGF)mRNA。结果落新妇苷在25、50、100、200、400μg/m L时,Ha Ca T细胞增殖抑制率分别为3.06%、26.53%、40.82%、60.20%及61.22%。落新妇苷在50、100、200μg/m L时,观察组Ha Ca T细胞早期凋亡率分别为3.26%、8.24%和15.38%;与空白对照组早期凋亡率(1.33%)比较,P均<0.05。与空白对照组比较,模型对照组NF-κB p65、OPN、VEGF mRNA表达增加(P均<0.01);与模型对照组比较,观察组随落新妇苷浓度增加,NF-κB p65、OPN、VEGF mRNA表达逐渐降低(P均<0.05)。结论土茯苓提取物落新妇苷能抑制Ha Ca T细胞增殖、诱导细胞凋亡,其机制可能与制抑细胞NF-κB p65、OPN、VEGF mRNA表达有关。
文摘Applephenon®, a purified extract prepared from green apples, was examined for its cytotoxicity and inhibitory effects on the proliferation of cultures of normal human keratinocytes and several epidermoid cancer cell lines. Our HPLC studies demonstrated a high content of phenolic compounds (>65%), including catechin, epicatechin, caffeic acid and phloretin as well as polyphenols such as proanthocyanidins. Applephenon® demonstrated a greater cytotoxic effect against HeLa, A431 cancer cell lines and HaCaT, an immortalized keratinocyte cell line than serum-free cultures of proliferating normal human keratinocytes (NHK). Proliferation of NHK was inhibited at concentrations above 0.0013% while concentrations above 0.005% were cytotoxic. By contrast, Applephenon® solutions above 0.00025% killed each of the cancer cell lines. Treated cells displayed increased intercellular separation and evidence of keratinizing stratification. We also tested the effect of epicatechin, and two isoflavonoids, genistein and daidzein, on cancer cell lines. Hela cells were more sensitive to epicatechin and genistein inhibition of cell growth and cytotoxicity than were NHK. Daidzein at these concentrations had little effect on cancer cells. These results indicate that Applephenon® and some of its phenolic components have selective anticancer activity.
文摘[目的]构建敲除Toll Like Receptor 4(TLR4)基因的Ha Ca T细胞株,为后续利用该细胞株进行过敏原性研究提供材料。[方法]利用CRISPR/Cas9系统,根据靶向原理设计并合成4条特异性识别TLR4基因的向导RNA(single-molecule guide RNAs,sgRNAs),构建p X459-sgRNAh TLR4重组质粒,并转入Ha Ca T中,用嘌呤霉素筛选出单克隆阳性细胞。测序确认突变位点,然后利用脂多糖(lipopolysaccharide,LPS)刺激对TLR4进行功能验证来进一步确认敲除效果。[结果]测序结果表明#26单克隆细胞株在靶点附近缺失1 bp,造成TLR4编码基因的移码突变,蛋白翻译提前终止。功能性验证结果表明,在LPS的刺激下,IL-8和CCL20的mRNA水平分别下降约85%和90%,且IL-8的蛋白分泌水平也显著性下调(87%)。[结论]成功构建了敲除TLR4的稳定细胞株,并且验证TLR4的功能缺损。
