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1
2018 - 07 - 05
doi.org/10.1038/s41586-018-0162-7基于20年的深入研究,得克萨斯大学西南医学中心(UT Southwestern)自噬研究中心的主任Beth Levine和团队已经明确:细胞自噬可以延长寿命、改善健康。他们以小鼠为模型发现,自噬水平提高的小鼠寿命更长、更健康。“具体来说,它们的寿命延长了约10%,且不太可能发生与年龄相关的自发性癌症、心脏病等疾病。”Beth Levine表示道。细胞自噬自噬是一种保护机制。当细胞内出现衰老的蛋白质、损坏的细胞器等废弃物时,自噬囊泡会将它们包裹并送至溶酶体中进行降解并得以循环利用,从而确保细胞本身的代谢需求和某些细胞器的更新。细胞自噬过程(图片来源:华威大学)20年前,Beth Levine和同事发现了自噬生物学过程中的一个关键基因beclin 1。他们还发现,自噬对于健康而言必不可少,例如预防神经衰退性疾病、对抗癌症和感染。2003年,Beth Levine团队证实,自噬关联的基因机制对于长寿突变线虫(long-lived mutant roundworms)的寿命延长至关重要。“从那以后,关于‘自噬是延长寿命的关键机制’的观点尤为火热。” Beth Levine解释道,“随着年龄增长,细胞的自噬能力会下降,这可能会导致衰老。”自噬延长寿命然而,一个关键问题仍然没有得到解答:增强自噬水平是否有益于哺乳动物的健康?换句...
2
2019 - 04 - 20
新华社武汉 4 月 19 日电(记者谭元斌)我国科研人员的一项最新研究表明,人神经前体细胞可以利用 RNA 干扰抗病毒免疫抵抗寨卡病毒感染。这一研究首次发现 RNA 干扰抗病毒免疫机制在人类神经发育过程中的关键作用,相关研究成果近期以封面文章的形式发表在国际知名期刊《细胞研究》上。在这项研究中,中国科学院武汉病毒研究所、军事科学院军事医学研究院、中国科学院动物研究所科研人员组成的联合研究团队,从寨卡病毒对人神经前体细胞独特的感染嗜性入手,首次在病毒自然感染的条件下证明了 RNA 干扰抗病毒免疫在人类细胞中的重要抗病毒作用。专家认为,人神经前体细胞中 RNA 干扰抗病毒通路的存在,为相应抗病毒药物的研发提供了新的靶标。他们发现,临床上广泛使用的 “老药” 依诺沙星能增强人神经前体细胞内 RNA 干扰的活性,在人神经前体细胞及由此分化产生的类脑器官中显示出非常高效的抗病毒作用,阻断了寨卡病毒感染所致的小头畸形表型。在同期的《细胞研究》上,刊登了世界著名病毒学家史佩勇教授对这项研究成果的评述文章。他在文章中评价这是 RNA 干扰研究的一项十分重要的进展。据中国科学院武汉病毒研究所专家介绍,RNA 干扰是生物体内普遍存在的一种古老的生物学现象,对控制生物体内基因表达起关键作用。而其作为人类中的一种重要抗病毒免疫机制,则是近年来由我国及欧美科学家的一系列研究共同发现。同时,RNA 干扰作为一...
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2018 - 07 - 13
对于酸奶我们并不陌生,超市冷藏柜中形形色色的酸奶有时候常常让我们眼花缭乱,酸奶作为人们日常饮食中不可缺少的食物,其对机体健康都有什么好处呢?看看下面这些研究吧!【1】希腊酸奶vs原味酸奶vs低脂酸奶 你如何选择一种最健康的酸奶?新闻阅读:Plain, Greek, low-fat? How to choose a healthy yoghurt酸奶是世界上最古老的发酵乳制品之一,其发源可以追溯到人类文明的开始,当人类开始驯养动物生产牛奶时,对于牛奶的保质期,人类就需要想出一些解决方案了。yoghurt(酸奶)一词来自土耳其,也就是说,在酸奶的生产过程中,牛奶会发生凝结或增稠的过程。与牛奶一样,酸奶也富含钙质和蛋白质,而且其还能为机体提供其它营养成分,比如碘、维生素D、B2、B12和锌等。但酸奶的营养要高于牛奶,主要的原因是发酵的过程会让其更易于被机体所消化,因此营养物质就可以很轻松地被机体所吸收。然而酸奶也有很多类型,比如希腊酸奶和液态酸奶,以及一些添加水果和益生菌的酸奶,那么你知道哪种酸奶最健康吗?通过向鲜奶中引入一些特定的细菌就能制作酸奶了,比如嗜热链球菌、德氏乳杆菌和保加利亚乳杆菌等。通常情况下这些细菌都会在酸奶中出现并且形成酸奶发酵液,它们的协同关系是最终产品一致性的关键因素,同时这也能够带来一些健康益处,比如降低机体腹泻的严重程度和持续时间等。【2】J Nutr and ...
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时间: 2019 - 04 - 22
描述The LIVE/DEAD™ Fixable Green Dead Cell Stain Kit is used to determine the viability of cells prior to the fixation and permeabilization required for intracellular antibody staining or prior to elimination of biohazardous materials using formaldehyde fixation. This kit has been optimized and validated for use with a blue laser flow cytometer.• Stable—dyes are freeze dried in separate vials to maintain stability• Robust—staining pattern is the same before and after fixation• Bright signal—allows...
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时间: 2019 - 04 - 18
描述This product detects the externalization of phosphatidylserine in apoptotic cells using recombinant annexin V conjugated to green-fluorescent FITC dye and dead cells using propidium iodide (PI). Propidium iodide stains necrotic cells with red fluorescence. After treatment with both probes, apoptotic cells show green fluorescence, dead cells show red and green fluorescence, and live cells show little or no fluorescence.
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时间: 2019 - 04 - 18
描述SYTOX® Green nucleic acid stain is an excellent green-fluorescent nuclear and chromosome counterstain that is impermeant to live cells, making it a useful indicator of dead cells within a population.•  Impermeant to live cells•  Excitation/Emission: 504/523 nm•  Use with 488 Argon-ion laser•  Works with mammalian cells and both Gram-positive and Gram-negative bacteriaSimple Viability Determination SYTOX® Green allows quick determination of cell viability when usin...
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时间: 2019 - 04 - 18
描述Premo™ FUCCI Cell Cycle Sensor is a fluorescent, two-color sensor of cell cycle progression and division in live cells. It allows accurate and sensitive cell cycle analysis of individual cells or a population of cells by fluorescence microscopy, flow cytometry, or high-content imaging.At 2 x 200 µL, this is a smaller pack size version (1/5 volume) of the popular full-size product and perfect for testing its performance in your system.The Premo™ FUCCI Cell Cycle Sensor is delivered by high...
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时间: 2019 - 04 - 18
描述CountBright™ absolute counting beads are a calibrated suspension of microspheres that are brightly fluorescent across a wide range of excitation and emission wavelengths (UV to 635 nm excitation and 385-800 nm emission). CountBright™ absolute counting beads are mixed with the cell sample and assayed via flow cytometry. By comparing the ratio of bead events to cell events, absolute numbers of cells in the sample can be calculated. Because CountBright™ beads are mixed in the test sample, absolut...
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时间: 2019 - 04 - 17
描述CellTrace™ CFSE Cell Proliferation Kit is used for in vitro and in vivo labeling of cells to trace multiple generations using dye dilution by flow cytometry.• Superior performance—bright, single-peak staining enables visualization of multiple generations• Long-term signal stability—well-retained in cells for several days post stain• Non-toxic—staining does not adversely effect cell health• Simple, robust staining protocolView a selection guide for all CellTrace™ Cell Proliferation Kits fo...
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时间: 2019 - 04 - 17
描述CellTrace™ CFSE 细胞增殖试剂盒 (CellTrace™ CFSE Cell Proliferation Kit) 以方便的一次性瓶装形式提供用途广泛,稳定性高的细胞示踪剂。 羧基荧光素二醋酸盐琥珀酰亚胺酯,常称为 CFSE,可被动扩散进入细胞。 这种试剂没有颜色和荧光,直至细胞内的酯酶去除其醋酸盐基团,产生能发出明亮荧光的羧基荧光素琥珀酰亚胺酯。 琥珀酰亚胺酯与细胞内氨基反应,形成稳定且能用醛固定剂固定的荧光偶联物。 此试剂盒包含十份一次性瓶装的 CFSE,因此进行小规模实验时无需制备过量的易变质 CFSE 储存液。 此试剂盒还包括高质量的 DMSO(二甲基亚砜)和详细的实验方案。For Research Use Only. Not for use in diagnostic procedures.图表Suppressive capacity of isolated Treg cells.Suppressive capacity of isolated Treg cells. (A) CD4+ CD25–cells were stained with Ca...
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时间: 2019 - 04 - 17
描述The Click-iT® EdU Pacific Blue™ Flow Cytometry Assay Kit provides a simplified, more robust assay for analyzing DNA replication in proliferating cells as compared to traditional BrdU methods. Newly synthesized DNA is analyzed using the 405 nm laser of the flow cytometer.• Accurate—superior results compared to BrdU assays• Fast—results in as little as 90 minutes• Economical—more assays per kitView selection guide for all Click-iT™ EdU and Click-iT™ Plus EdU assays for flow c...
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时间: 2019 - 04 - 17
描述The 2018 Attune NxT Acoustic Focusing Cytometer has expanded functionalities to drive your research forward. Designed and developed to remove common barriers associated with flow cytometry, the evolutionary capabilities of the Attune NxT flow cytometer offer adaptable optical configuration options so you can get the most out of your multicolor analysis.• Free Attune NxT software with researcher-inspired upgrades• New green laser option for expanded utility and fluorochrome options• Simple push...
型号:
时间: 2019 - 04 - 17
描述The 2018 Attune NxT Acoustic Focusing Cytometer has expanded functionalities to drive your research forward. Designed and developed to remove common barriers associated with flow cytometry, the evolutionary capabilities of the Attune NxT flow cytometer offer adaptable optical configuration options so you can get the most out of your multicolor analysis.• Free Attune NxT software with researcher-inspired upgrades• New green laser option for expanded utility and fluorochrome options• Simple push...
型号:
时间: 2019 - 04 - 17
描述The 2018 Attune NxT Acoustic Focusing Cytometer has expanded functionalities to drive your research forward. Designed and developed to remove common barriers associated with flow cytometry, the evolutionary capabilities of the Attune NxT flow cytometer offer adaptable optical configuration options so you can get the most out of your multicolor analysis.• Free Attune NxT software with researcher-inspired upgrades• New green laser option for expanded utility and fluorochrome options• Simple push...
型号:
时间: 2019 - 04 - 17
描述The 2018 Attune NxT Acoustic Focusing Cytometer has expanded functionalities to drive your research forward. Designed and developed to remove common barriers associated with flow cytometry, the evolutionary capabilities of the Attune NxT flow cytometer offer adaptable optical configuration options so you can get the most out of your multicolor analysis.• Free Attune NxT software with researcher-inspired upgrades• New green laser option for expanded utility and fluorochrome options• Simple push...
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