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相关概念视频

Ecological Niches02:02

Ecological Niches

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All organisms have a position within an ecosystem. The complete set of living and nonliving factors—including food resources, climate, and terrain—that define the position of a given organism are collectively referred to as the organism’s ecological niche.
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The stem cell niche is the dynamic microenvironment where stem cells reside. Inside these niches, the cells may remain undifferentiated, undergo high self-renewal, or become lineage-specific progenitors. Stem cells coexist with other niche cells, such as stromal cells. They also interact closely with the ECM. Cell-cell and cell-matrix communication occur via adhesion molecules or soluble factors that signal the stem cells and determine their fate. Stromal cells also provide survival signals to...
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A hair follicle or HF is a small part of the skin that produces the hair shaft. Paul Gerson Unna was the first to observe a bulge in the human hair follicle's outer root sheath (ORS). The bulge is present between the sebaceous gland and the arrector pili muscle and is the niche for hair follicle stem cells (HFSCs). The bulge is also a niche for melanocyte stem cells, and their loss results in graying of hair. The HFSCs express Sox9 and Lhx2, which help them maintain stemness and prevent...
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The microscopic anatomy of the liver is a complex and intricate system that comprises numerous structural units known as liver lobules, each of which is comparable in size to a sesame seed. These hexagonal structures consist of plates of liver cells or hepatocytes, which are characterized by their versatility and abundance of cellular apparatus like rough and smooth ER, Golgi apparatus, peroxisomes, and mitochondria.
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The liver, an essential organ in the human body, performs over 200 vital functions that can be broadly categorized into metabolic, hematological, endocrine regulation, and bile production.
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The liver is an important organ in vertebrates that plays an essential role in metabolism. It is also responsible for storing and redistributing nutrients such as carbohydrates, fats, and vitamins in the body. Additionally, the liver releases bile salts which are critical for digesting food and eliminating toxic metabolites from the body.
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    新生儿肝脏扩展调节性T细胞 (Tregs) 独立于肠道微生物,建立免疫耐受性. 这种早期的免疫教育会在以后的生活中影响病毒感染和肝脏疾病.

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    科学领域:

    • 免疫学 免疫学 免疫学
    • 肝病学 肝病学是一种肝病学.
    • 发育生物学 发展生物学

    背景情况:

    • 免疫系统必须在出生后平衡对自我和同伴的耐受性与病原体防御.
    • 肝脏在早期免疫发育和耐受性中的作用尚未完全理解.

    研究的目的:

    • 研究新生儿肝脏作为免疫系统教育中心的功能.
    • 阐明早期产后肝脏T细胞种群的机制.

    主要方法:

    • 新生儿肝脏T细胞群 (Tregs和Tconvs) 的表征.
    • 对树突细胞 (DC) 子集 (cDC1s) 和它们与T细胞的相互作用进行分析.
    • 研究分子通路,包括MHCII,CCR7和PD-L1.

    主要成果:

    • 在新生儿肝脏 (1至2周) 发生调节性T细胞 (Tregs) 的微生物群独立扩张.
    • 通过MHCII,CCR7+cDC1s呈现抗原,形成耐受性DC:T细胞群,促进Treg扩张.
    • PD-L1检查点可以选择性地增加Tregs,而不会激活常规T细胞 (Tconvs).
    • 这种新生儿计划影响了对慢性病毒感染的易感性,并在成年后保护免受肥胖性疾病的影响.

    结论:

    • 新生儿肝脏是T细胞早期形成和免疫耐受性的关键部位.
    • 描述的过渡性计划对生命早期的干预和疾病易感性有重大,时机敏感的影响.