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Peroxisomes01:24

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Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...
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Peroxisomes and Mitochondria01:30

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Peroxisomes and mitochondria are two important oxygen-utilizing organelles in eukaryotic cells. Mitochondria carry out cellular respiration—the process that converts energy from food into ATP. Peroxisomes carry out a variety of functions, primarily breaking down different substances, such as fatty acids.
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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
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A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
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Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
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The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
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肺炎球菌H2O2重塑线粒体功能并重新编程宿主细胞代谢.

Anna Scasny, Babek Alibayov, Ngoc Hoang

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    此摘要是机器生成的。

    肺炎 estreptococcus 使用过氧化来破坏宿主细胞代谢,抑制TCA循环并促进类似Warburg的转变,以支持肺炎期间的细菌生存. 这种新陈代谢重编程为肺炎球菌感染提供了新的治疗点.

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    科学领域:

    • 微生物学 微生物学
    • 细胞的新陈代谢
    • 传染性疾病 传染性疾病

    背景情况:

    • 肺炎 estreptococcus (Spn) 通过一种独特的代谢途径引起肺炎,产生过氧化 (H2O2).
    • 由Spn衍生出的H2O2主要是由氧化酶 (SpxB) 产生的.
    • 宿主细胞的代谢重编程对于病原体的生存至关重要.

    研究的目的:

    • 阐明由Spn衍生的H2O2影响宿主肺上皮细胞代谢的机制.
    • 为了确定Spn-H2O2.2.所针对的特定代谢途径.
    • 了解这些代谢变化是如何支持SPN感染的.

    主要方法:

    • 在体外研究中使用肺上皮细胞和Spn.
    • 测量TCA循环酶活性.
    • 用RNA测序来分析基因表达.
    • 分析线粒体膜潜力和亡.

    主要成果:

    • 由SPN衍生的H2O2抑制了关键的TCA循环酶 (乙酸,谷氨酸脱酶,α-甲酸脱酶).
    • 这种抑制导致酸盐的积累和减少NADH的产生.
    • 宿主细胞表现出增加的葡萄糖消耗和乳酸/乙酸生产,一种类似于沃堡的代谢转移.
    • 在SpxB-依赖的H2O2上调 glycolytic 基因 (HK2, PFKP).

    结论:

    • Spn通过H2O2操纵宿主细胞代谢,为细菌的生存创造一个有利的环境.
    • 针对Spn的代谢途径或由此产生的宿主细胞变化,为肺炎球菌疾病提供了潜在的治疗策略.
    • 尽管代谢中断,但SPN感染诱导了最小的亡并维持了线粒体功能.