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Related Concept Videos

Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

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.
ROS generation is regulated and maintained at moderate levels necessary...
Mitochondrial Membranes01:45

Mitochondrial Membranes

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,...
Mitochondrial Membranes01:45

Mitochondrial Membranes

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,...
Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
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,...
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,...

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Related Experiment Video

Updated: Jul 8, 2026

Experimental Approaches to Study Mitochondrial Localization and Function of a Nuclear Cell Cycle Kinase, Cdk1
13:15

Experimental Approaches to Study Mitochondrial Localization and Function of a Nuclear Cell Cycle Kinase, Cdk1

Published on: February 25, 2016

Targeting mitochondria.

Adam T Hoye1, Jennifer E Davoren, Peter Wipf

  • 1Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA.

Accounts of Chemical Research
|January 16, 2008
PubMed
Summary
This summary is machine-generated.

Targeting mitochondria with novel nitroxide conjugates offers a promising strategy to combat degenerative diseases. These agents prevent reactive species damage, protecting cells from apoptosis and improving outcomes in conditions like hemorrhagic shock.

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Area of Science:

  • Mitochondrial biochemistry and redox signaling in disease pathogenesis.
  • Development of targeted therapeutic agents for degenerative diseases.

Background:

  • Reactive oxygen and nitrogen species (ROS/RNS) are implicated in numerous degenerative diseases, including Alzheimer's, Parkinson's, stroke, and cancer.
  • Mitochondria, the cellular energy producers, are a primary source of ROS/RNS, and their escape can trigger cell death pathways.
  • Oxidative damage to mitochondrial components, particularly cardiolipin (CL), leads to cytochrome c release and apoptosis.

Purpose of the Study:

  • To develop novel therapeutic strategies targeting mitochondria to mitigate ROS/RNS-induced damage.
  • To investigate the efficacy of mitochondria-targeted nitroxide conjugates as anti-apoptotic agents.

Main Methods:

  • Conjugation of nitroxides to natural product segments with high mitochondrial affinity, such as gramicidin S.
  • Evaluation of conjugate efficacy in preventing superoxide production, CL oxidation, and cellular apoptosis in vitro.
  • Assessment of in vivo protection against apoptosis induced by intestinal hemorrhagic shock.

Main Results:

  • Mitochondria-targeted nitroxide/gramicidin conjugates effectively prevented superoxide production and CL oxidation in cells and isolated mitochondria.
  • These conjugates protected cells against various pro-apoptotic triggers, including actinomycin D, radiation, and staurosporine.
  • In vivo studies demonstrated protection against apoptosis induced by intestinal hemorrhagic shock, highlighting therapeutic potential.

Conclusions:

  • Mitochondria-targeted nitroxides represent a promising new class of anti-apoptotic agents.
  • Optimization of nitroxide carriers could lead to effective therapies acting at the early mitochondrial stage of cell death.
  • Emerging structural principles for mitochondrial targeting include positive charges, hydrophobic regions, and specific transport/binding mechanisms.