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相关概念视频

Replicative Cell Senescence02:15

Replicative Cell Senescence

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Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds...
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Maintenance of the ES Cell State01:14

Maintenance of the ES Cell State

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The cells of the blastocyst inner cell mass only remain pluripotent for a short time. This state of pluripotency and self-renewal can be maintained in embryonic stem (ES) cell culture by adding specific chemicals or growth factors to ensure the cells can continue dividing and later differentiate into different cell types. In some cases, the cells are grown on a feeder layer of differentiated cells, which provides the growth factors and extracellular matrix components necessary for stem cell...
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Abnormal Proliferation02:23

Abnormal Proliferation

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Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
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Somatic to iPS Cell Reprogramming01:29

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Reprogramming alters the gene expression in somatic cells, transforming them into induced pluripotent stem (iPS) cells over several generations. Scientists can reprogram cells by introducing genes for four transcription factors—Oct4, Sox2, Klf4, and c-Myc (OSKM) by viral or non-viral methods. These factors are also known as Yamanaka factors after Shinya Yamanaka, who first generated iPS cells using mouse skin cells. Yamanaka was awarded the Nobel Prize in Physiology or Medicine in 2012...
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The Effect of Aging on Tissues01:19

The Effect of Aging on Tissues

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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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Cell-mediated Immune Responses01:40

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相关实验视频

Updated: Jan 15, 2026

A Quantitative Measurement of Reactive Oxygen Species and Senescence-associated Secretory Phenotype in Normal Human Fibroblasts During Oncogene-induced Senescence
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CD4 T细胞获得eomesodermin以调节细胞衰老和衰老.

Yehezqel Elyahu1,2,3, Ilana Feygin1,2, Ekaterina Eremenko1,2

  • 1The Shraga Segal Department of Microbiology, Immunology and Genetics, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel.

Nature aging
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概括

衰老导致组织衰退,但称为CD4 T淋巴细胞 (CD4-Eomes) 的免疫细胞有助于管理衰老细胞. 消除这些细胞加快了衰老和疾病,突出了它们在长寿中的作用.

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A Quantitative Measurement of Reactive Oxygen Species and Senescence-associated Secretory Phenotype in Normal Human Fibroblasts During Oncogene-induced Senescence
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科学领域:

  • 免疫学 免疫学 免疫学
  • 老年学是指老年学的学科.
  • 细胞生物学 细胞生物学

背景情况:

  • 老龄化导致组织功能障碍和增加疾病易感性.
  • 衰老细胞 (SCs) 随着年龄的增长而积累,但它们的免疫调节尚不清楚.
  • CD4 T 细胞是关键的免疫参与者,但它们在控制衰老中的作用尚不清楚.

研究的目的:

  • 研究CD4 T淋巴细胞在调节衰老过程中衰老细胞负担中的作用.
  • 确定CD4-Eomes细胞对与年龄相关的组织恶化和寿命的影响.
  • 为了探索CD4-Eomes细胞在慢性炎症疾病如肝硬化中的功能.

主要方法:

  • 在富含SC的环境中观察CD4 T细胞分化为Eomesodermin (Eomes) +CCL5+T淋巴细胞 (CD4-Eomes).
  • 使用老化药物来降低SC负载,并评估它们对CD4-Eomes分化的影响.
  • 在老鼠和肝硬化模型中的CD4T细胞中选择性遗传删除Eomes转录因子.

主要成果:

  • 使用老化剂减少SC负载,阻止了CD4-Eomes的分化.
  • 在老年小鼠中消除CD4-Eomes细胞导致SC积累增加,身体衰退,寿命缩短.
  • 在肝硬化模型中,CD4-Eomes细胞枯竭加剧了纤维化,并加剧了疾病的严重程度.

结论:

  • CD4-Eomes细胞对于调节组织衰老和缓解与年龄相关的衰退至关重要.
  • 这些发现揭示了影响衰老和寿命的基本免疫机制.
  • 向CD4-Eomes细胞可能为与年龄相关的疾病提供治疗策略,并延长健康寿命.