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Related Concept Videos

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

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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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Inborn Errors of Metabolism01:20

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Phenylketonuria (PKU) is a protein metabolism disorder characterized by high blood levels of the amino acid phenylalanine. This results from a mutation in the gene responsible for phenylalanine hydroxylase, an enzyme that converts phenylalanine into tyrosine. When this enzyme is deficient, phenylalanine builds up in the blood, leading to symptoms such as vomiting, rashes, seizures, growth deficiency, and severe mental retardation. An early diagnosis and a diet restricting phenylalanine intake...
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Mitochondrial Precursor Proteins01:39

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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.
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Translocation of Proteins into the Mitochondria01:19

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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
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The Inner Mitochondrial Membrane01:28

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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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Author Spotlight: Modeling an Aspect of Preeclampsia in Female Mice Using Hypoxic Human Placenta-Derived Small Extracellular Vesicles
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Mitochondrial [dys]function; culprit in pre-eclampsia?

Cathal Michael McCarthy1, Louise Clare Kenny2

  • 1Department of Obstetrics and Gynaecology, The Irish Centre for Fetal and Neonatal Translational Research (INFANT), University College Cork, Cork, Ireland cmccarthy@ucc.ie.

Clinical Science (London, England : 1979)
|June 3, 2016
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Summary

Mitochondrial dysfunction contributes to oxidative stress in pre-eclampsia. Targeting mitochondrial reactive oxygen species (ROS) with antioxidants may improve maternal and fetal health.

Keywords:
antioxidantsmitochondriapre-eclampsiareactive oxygen species (ROS)

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Area of Science:

  • Cell Biology
  • Pathophysiology
  • Biochemistry

Background:

  • Mitochondria are key regulators of cellular signaling and adapt to stress via reactive oxygen species (ROS).
  • Dysregulated mitochondrial ROS production is linked to cellular dysfunction and disease.
  • Mitochondrial dysfunction, oxidative stress, and inflammation are implicated in pre-eclampsia pathogenesis.

Purpose of the Study:

  • To investigate the role of mitochondrial dysfunction in mediating oxidative stress in pre-eclampsia.
  • To hypothesize that mitochondrial-targeted antioxidants can mitigate ROS-mediated redox signaling.

Main Methods:

  • Review of existing literature on mitochondrial function, ROS, and pre-eclampsia.
  • Hypothetical framework development based on current understanding.

Main Results:

  • Mitochondrial dysfunction is a proposed key factor in pre-eclampsia pathophysiology.
  • Excessive mitochondrial ROS production exacerbates oxidative stress and inflammation.

Conclusions:

  • Mitochondrial dysfunction is hypothesized to be a pathogenic mediator of oxidative stress in pre-eclampsia.
  • Mitochondrial-targeted antioxidants offer a potential therapeutic strategy to improve maternal and fetal outcomes by reducing ROS.
  • Further research into superoxide scavenging therapies is warranted for pre-eclampsia treatment.