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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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A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
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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,...
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In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
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Nanotechnology inspired tools for mitochondrial dysfunction related diseases.

Ru Wen1, Bhabatosh Banik1, Rakesh K Pathak1

  • 1NanoTherapeutics Research Laboratory, Department of Chemistry, University of Georgia, Athens, GA 30602, United States.

Advanced Drug Delivery Reviews
|January 19, 2016
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Summary

Mitochondrial dysfunction drives diseases like cancer and neurological disorders. Nanotechnology offers promising targeted drug delivery to mitochondria, improving therapeutic efficiency and reducing side effects.

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Area of Science:

  • Biomedical Science
  • Nanotechnology
  • Mitochondrial Biology

Background:

  • Mitochondrial dysfunction is implicated in numerous diseases, including cancer, cardiovascular conditions, diabetes, and neurological disorders.
  • Targeting intracellular mitochondria presents significant challenges due to organelle-specific barriers to drug internalization.
  • Developing effective therapeutic strategies requires overcoming these delivery hurdles to enhance treatment efficacy.

Purpose of the Study:

  • To review potential therapeutic targets within mitochondria for various diseases.
  • To explore the role of nanotechnology in overcoming mitochondrial drug delivery challenges.
  • To highlight nanomedicine as a promising approach for treating mitochondrial dysfunction-related diseases.

Main Methods:

  • Literature review of existing research on mitochondrial dysfunction and therapeutic targets.
  • Analysis of nanotechnology applications for targeted drug delivery to mitochondria.
  • Synthesis of information on nanomedicine strategies for various disease contexts.

Main Results:

  • Identification of key mitochondrial compartments as therapeutic targets.
  • Demonstration of nanotechnology's potential for controlled and targeted drug delivery to mitochondria.
  • Evidence supporting nanomedicine's role in improving therapeutic indices and reducing side effects.

Conclusions:

  • Nanotechnology provides a viable solution for enhancing drug accessibility to mitochondrial targets.
  • Tailor-made nanomedicines are crucial for effective treatment of mitochondrial dysfunction-related diseases.
  • This review consolidates knowledge on mitochondrial targets and nanodelivery systems for diverse pathologies.