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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,...
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,...
Energy to Drive Translocation01:37

Energy to Drive Translocation

Mitochondrial protein import is powered by two distinct energy sources: ATP hydrolysis and electrochemical potential across the inner membrane. Newly synthesized precursors are bound by cytosolic chaperones of the Hsp70 family, which guide them to the import receptors on the mitochondrial surface. Utilizing the energy of ATP hydrolysis, Hsp70 chaperones transfer these precursors to the TOM receptors on the mitochondrial outer membrane.
Generally, polypeptides are unfolded by two distinct...

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Mitochondrial energetics and therapeutics.

Douglas C Wallace1, Weiwei Fan, Vincent Procaccio

  • 1Center for Molecular and Mitochondrial Medicine and Genetics and Departments of Biological Chemistry, Ecology and Evolutionary Biology, and Pediatrics, University of California at Irvine, Irvine, California 92697-3940, USA. dwallace@uci.edu

Annual Review of Pathology
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Summary

Mitochondrial dysfunction underlies many diseases, but metabolic therapies fail due to poor understanding of bioenergetics. A systems approach, like the ketogenic diet, offers potential for new bioenergetic therapeutics.

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Area of Science:

  • Cell Biology
  • Metabolic Diseases
  • Aging

Background:

  • Mitochondrial dysfunction is implicated in degenerative diseases, cancer, and aging.
  • Cellular bioenergetics is central to these conditions.
  • Current metabolic therapies are ineffective due to limited understanding of bioenergetics.

Purpose of the Study:

  • To explore the role of bioenergetics as an interface between the environment and the cell.
  • To re-evaluate the ketogenic diet as a systems approach to metabolic therapy.
  • To understand how metabolic shifts impact cellular processes.

Main Methods:

  • Analysis of metabolic shifts from carbohydrate to fatty acid/ketone metabolism.
  • Investigating modulation of metabolism, signal transduction, and the epigenome.
  • Reviewing historical success of the ketogenic diet.

Main Results:

  • The ketogenic diet represents a successful historical systems approach to metabolism.
  • Shifting metabolism impacts key cellular pathways.
  • Bioenergetics is a critical link between environment and cellular function.

Conclusions:

  • A systems approach is needed for effective metabolic therapies.
  • The ketogenic diet demonstrates the potential of bioenergetic therapeutics.
  • Further research into metabolic modulation can advance treatment strategies.