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Electron Transport Chain: Complex I and II01:46

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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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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...
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The mitochondrial cristae membrane is the primary site for the oxidative phosphorylation (OXPHOS) process of energy conversion mediated through respiratory complexes I to V. These complexes have been widely studied for decades, and it has been proven that they form supramolecular structures called respiratory supercomplexes (SC). These higher-order complexes may be crucial in maintaining the biochemical structure and improving the physiological activity of the individual complexes while...
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The electron transport chain or oxidative phosphorylation is an exothermic process in which free energy released during electron transfer reactions is coupled to ATP synthesis. This process is a significant source of energy in aerobic cells, and therefore inhibitors of the electron transport chain can be detrimental to the cell's metabolic processes.
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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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During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
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ミトコンドリアのテロメラーゼ逆転写酵素は,複合体Iの構成と機能を改善することによって,心筋動脈不全/再注血損傷から保護する.

Niloofar Ale-Agha1, Philipp Jakobs1, Christine Goy1,2

  • 1Environmentally-induced Cardiovascular Degeneration, Clinical Chemistry and Laboratory Diagnostics (N.A.-A., P,J., C.G., M.Z., J.R., N.D.-R., J.G., F.v.A., O.E., J.A., J.H.), University Hospital and Heinrich-Heine University, Düsseldorf, Germany.

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|October 21, 2021
PubMed
まとめ

ミトコンドリアのテロメラーゼ逆転写酵素 (TERT) は,ミトコンドリアの機能を改善し,心臓発作の大きさを減らすことで,心臓を損傷から守ります. ミトコンドリアのTERTを増加させることで,心臓の保護のための新しい治療法を提供することができる.

キーワード:
マウス トランスジェニックミトコンドリア心筋動脈不全ミオフィブロブラストリパルフュージョン損傷テロメラーゼ

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科学分野:

  • 心血管生物学
  • ミトコンドリア医学
  • テロメア生物学

背景:

  • テロメラーゼ逆転写酵素 (TERT) は心血管の保護機能があることが知られている.
  • TERTは核とミトコンドリアの両方に局所化しますが,各コンパートメントにおける特定の役割は不明です.
  • 現存する研究では,核とミトコンドリアのTERT機能を区別するツールが不足しています.

研究 の 目的:

  • 心血管保護における核およびミトコンドリアのTERTの異なる役割を解明する.
  • ミトコンドリアのTERTが心臓機能と損傷反応に与える影響を調査する.
  • ミトコンドリアのTERTを標的とした 治療の可能性を探るため

主な方法:

  • 独占的なミトコンドリア (mitoTERT) または核 (nucTERT) TERT発現を持つ新しいマウスモデルを生成した.
  • イシュケミア/再輸傷による評価結果
  • ミトコンドリア呼吸,心筋細胞アポトーシス,ミオフィブロブラストの分化,内皮細胞機能の評価
  • ミトコンドリア複合体Iサブユニットの構成を分析した.

主要な成果:

  • ミトコンドリア TERT (ミトTERT) は心臓のミトコンドリア呼吸を強化し,心臓発作のサイズとエジェクション分数の減少を減少させた.
  • 核 TERT (nucTERT) は保護を与えず,TERT欠乏はミトコンドリア呼吸を阻害しました.
  • mitoTERTは心筋細胞の生存率,ミオフィブロブラストの分化,内皮細胞の移動を改善しました.
  • TERTはヒトの心臓ミトコンドリアで発見され,不血性予備によって増加した.

結論:

  • ミトコンドリアのTERTは,核のTERTではなく,ミトコンドリアの呼吸とイシュケミア/再注射損傷に対する保護に不可欠です.
  • ミトコンドリアのTERTは複合体Iの機能を強化し,心臓を保護する.
  • ミトコンドリアのTERTレベルを高めることは,心血管疾患の治療戦略として有望です.