関連する実験動画
Updated: Jul 11, 2026
12:08
Telomere Length and Telomerase Activity; A Yin and Yang of Cell Senescence
Published on: May 22, 2013
テロメラーゼを正常なヒト細胞に導入することで寿命を延長する
A G Bodnar1, M Ouellette, M Frolkis
1Geron Corporation, Menlo Park, CA 94025, USA.
Science (New York, N.Y.)
|February 7, 1998
まとめ
細胞衰老,すなわち細胞分裂の限界である細胞衰老は,テロメアの縮小によって引き起こされる. テロメラーゼを導入することで,テロメアを伸ばし,ヒト細胞の老化を防止し,テロメアの長さが細胞の老化を制御することを証明しました.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- 正常なヒト細胞は有限な数の分裂があり,複製性老化に入ります.
- テロメア短縮は,老化を誘発する分子時計であると仮定されています.
研究 の 目的:
- テロメア短縮と細胞老化の因果関係を調査する.
- テロメラーゼが正常なヒト細胞の衰老を予防したり逆転させたりできるかどうかを判断する.
主な方法:
- 2つのテロメラーゼ陰性正常人細胞タイプ (網膜色素の上皮細胞と先頭皮の線維芽細胞) が,ヒトテロメラーゼの触媒サブユニットをコードするベクトルに感染する.
- テロメラーゼ発現クローンとテロメラーゼ陰性対照クローンの比較,テロメアの長さ,細胞分裂,老化マーカー (β-ガラクチオシダゼ染色) について.
主要な成果:
- テロメラーゼを発現するクローンは,テロメアが縮小され,老化している対照クローンとは異なり,延長されたテロメアと活発な細胞分裂を示した.
- テロメラーゼ発現細胞におけるベータ-ガラクトシダース染色体の減少は,老化の遅延または予防を示唆した.
- テロメラーゼを発現するクローンは正常なカリオタイプを維持し,通常の寿命を少なくとも20倍に超えた.
結論:
- テロメア短縮と細胞老化の因果関係が確立された.
- テロメラーゼが正常なヒト細胞をフェノタイプ的に若々しい状態に維持できることを実証した.
- 細胞長寿のための研究と医学におけるテロメラーゼの潜在的な応用を強調した.
さらに関連する動画
10:14Telomerase Activity in the Various Regions of Mouse Brain: Non-Radioactive Telomerase Repeat Amplification Protocol (TRAP) Assay
Published on: September 2, 2014
08:34Utilizing Murine Inducible Telomerase Alleles in the Studies of Tissue Degeneration/Regeneration and Cancer
Published on: April 13, 2015
関連する概念動画
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01:29Replication in Eukaryotes
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Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
02:41Telomeres 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.
02:15Replicative 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...