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関連する概念動画

Mitochondria01:37

Mitochondria

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,...
Replication in Eukaryotes01:29

Replication in Eukaryotes

In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
Replication in Eukaryotes02:31

Replication in Eukaryotes

Overview
Replicative Cell Senescence02:15

Replicative Cell Senescence

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 the telomeric...
Telomeres and Telomerase02:41

Telomeres and Telomerase

In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded DNA.
Telomeres and Telomerase02:41

Telomeres and Telomerase

In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded DNA.

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Updated: Jun 4, 2026

Phosphorus-31 Magnetic Resonance Spectroscopy: A Tool for Measuring In Vivo Mitochondrial Oxidative Phosphorylation Capacity in Human Skeletal Muscle
09:40

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テロメア機能障害は代謝とミトコンドリアの妥協を引き起こします.

Ergün Sahin1, Simona Colla, Marc Liesa

  • 1Belfer Institute for Applied Cancer Science, Dana-Farber Cancer Institute, Boston, Massachusetts 02115, USA.

Nature
|February 11, 2011
PubMed
まとめ

テロメア機能障害は,p53を活性化することでミトコンドリア機能を低下させ,p53は重要な代謝調節体を抑制する. これらの因子を復元したり,p53を削除したりすると,ミトコンドリアの健康と臓器の機能を改善し,重要なテロメア-p53-PGC軸を明らかにします.

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科学分野:

  • 分子生物学は分子生物学である.
  • 遺伝学 遺伝学とは
  • ミトコンドリア生物学

背景:

  • テロメア機能障害は組織縮と機能的衰退を引き起こす.
  • その影響は静止している組織にまで広がり,一般的なメカニズムを調査する必要が生じます.

研究 の 目的:

  • テロメア機能障害が様々な組織に及ぼす影響の基礎となる共通の分子機構を特定する.
  • テロメア生物学とミトコンドリア機能の関連を解明する.

主な方法:

  • テロメラーゼ成分 (Tert または Terc) が欠けているマウスのトランスクリプトミックのネットワーク分析.
  • p53 (Trp53) とペロキシソーム増殖剤活性化受容体ガンマ,共活性化剤1αおよびβ (PGC-1α/β) の役割を調査した.
  • ミトコンドリアのバイオゲネシス,機能,グルコネオゲネシス,心臓機能の評価.

主要な成果:

  • テロメア機能不全により,PGC-1αとPGC-1βが深刻に抑制されました.
  • マウスはミトコンドリア機能の障害,グルコネオゲネシスの低下,心筋病変を示した.
  • p53はPGC-1α/βプロモーターを直接抑制し,テロメアの機能不全と代謝経路を結びつける.

結論:

  • 直接的なテロメア-p53-PGC軸は,テロメアの維持をミトコンドリアおよび代謝の恒常状態と結びつける.
  • この軸は,テロメアストレス下での臓器不全と体調低下に寄与する.
  • この軸をターゲットにすると,テロメア関連の疾患の治療の可能性が生まれます.