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Related Concept Videos

Mitochondria01:37

Mitochondria

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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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Mitochondrial Membranes01:45

Mitochondrial Membranes

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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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Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

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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.
ROS generation is regulated and maintained at moderate levels necessary...
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Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

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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,...
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Mitochondrial Precursor Proteins01:39

Mitochondrial Precursor Proteins

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Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
Most of the mitochondrial...
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The Inner Mitochondrial Membrane01:28

The Inner Mitochondrial Membrane

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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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Understanding the Changes in Mitochondrial Morphology through Dynamic and Three-dimensional Fluorescence Micrographs
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Mitochondrial uncoupling and longevity - A role for mitokines?

Susanne Klaus1, Mario Ost2

  • 1German Institute of Human Nutrition in Potsdam Rehbrücke, Nuthetal, Germany; University of Potsdam, Institute of Nutritional Science, Potsdam, Germany.

Experimental Gerontology
|December 2, 2019
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Mitochondrial uncoupling, a natural process, may extend lifespan by reducing oxidative damage and activating stress resistance pathways. This process involves key signaling molecules like FGF21 and GDF15, promoting metabolic health.

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Area of Science:

  • Mitochondrial biology
  • Aging research
  • Cellular signaling

Background:

  • Aging theories include random damage accumulation and programmed processes.
  • Mitochondria are central to aging, producing reactive oxygen species (ROS) and acting as signaling hubs.
  • The
  • uncoupling to survive
  • hypothesis suggests mitochondrial uncoupling protects against ROS.

Purpose of the Study:

  • To explore the role of mitochondrial uncoupling in aging and lifespan extension.
  • To investigate the link between mitochondrial uncoupling, mitohormesis, and health-promoting effects.

Main Methods:

  • Review of existing evidence on mitochondrial uncoupling and lifespan in rodents.
  • Analysis of the
  • uncoupling to survive
  • hypothesis and supporting data.
  • Examination of the role of uncoupling protein 1 (UCP1) and stress-induced mitokines.

Main Results:

  • Increased mitochondrial uncoupling, both endogenous (UCP1-mediated) and experimental, correlates with extended lifespan in rodents.
  • Mitochondrial uncoupling may activate molecular pathways similar to caloric restriction.
  • Mitohormesis, an adaptive stress response, is activated by mitochondrial uncoupling, leading to increased stress resistance.

Conclusions:

  • Mitochondrial uncoupling is a potential mechanism for lifespan extension and health promotion.
  • Stress-induced mitokines fibroblast growth factor 21 (FGF21) and growth differentiation factor 15 (GDF15) are key mediators of beneficial metabolic effects.
  • Mitohormesis, driven by mitochondrial signaling, offers a framework for understanding health benefits of uncoupling.