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Related Concept Videos

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,...
Electron Transport Chains01:28

Electron Transport Chains

The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle.
The ETC is comprised of...
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,...

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Studying Mitochondrial Structure and Function in Drosophila Ovaries
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[Function of DJ-1 in mitochondria].

Kazuko Takahashi-Niki1, Takeshi Niki, Sanae Iguchi-Ariga

  • 1Hokkaido University Graduate School of Pharmaceutical Science, Kita-ku, Sapporo, Japan. nkazu@pharm.hokudai.ac.jp

Yakugaku Zasshi : Journal of the Pharmaceutical Society of Japan
|October 6, 2012
PubMed
Summary

DJ-1 protein protects against Parkinson's disease by maintaining mitochondrial function. Loss of DJ-1 impairs mitochondrial complex I activity, suggesting its crucial role in preventing neurodegeneration.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Parkinson's disease (PD) is a neurodegenerative disorder linked to dopamine cell death, oxidative stress, and mitochondrial dysfunction.
  • While mostly idiopathic, 5-10% of PD cases have genetic links, with DJ-1 (PARK7) identified as a causative gene.
  • DJ-1's known roles include transcriptional regulation and anti-oxidative stress, with its loss implicated in PD onset.

Purpose of the Study:

  • To investigate the role of DJ-1 in mitochondrial homeostasis and its direct involvement in mitochondrial complex I activity.
  • To determine if DJ-1's mitochondrial localization is influenced by oxidative stress.

Main Methods:

  • Treatment of mice and cells with bisphenol A (BPA) to induce oxidative stress.
  • Analysis of DJ-1 translocation into mitochondria.
  • Co-immunoprecipitation assays to assess DJ-1 binding to mitochondrial complex I subunits (NDUFA4, ND1).
  • Measurement of mitochondrial complex I activity in DJ-1-knockdown cells.

Main Results:

  • Bisphenol A treatment induced DJ-1 translocation into mitochondria, preserving mitochondrial complex I activity.
  • DJ-1 was found to directly bind and co-localize with mitochondrial complex I subunits NDUFA4 and ND1.
  • Mitochondrial complex I activity was significantly reduced in DJ-1-knockdown cells (NIH3T3 and HEK293).

Conclusions:

  • DJ-1 functions as an integral mitochondrial protein essential for maintaining mitochondrial complex I activity.
  • DJ-1 plays a critical role in regulating mitochondrial homeostasis, potentially through its interaction with complex I.
  • These findings highlight DJ-1's importance in preventing mitochondrial dysfunction relevant to Parkinson's disease pathogenesis.