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Related Concept Videos

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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Cholesterol: Significance and Regulation01:29

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Although not a source of energy, cholesterol plays a significant role as a foundational structure for bile salts, steroid hormones, and vitamin D, as well as being a crucial component of plasma membranes. Approximately 15% of blood cholesterol is derived from our diet, with the remainder synthesized from acetyl CoA by the liver and intestines. Cholesterol is eliminated from the body through its conversion into bile salts, which are eventually discarded in the feces.
Considering cholesterol and...
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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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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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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.
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Related Experiment Video

Updated: Dec 11, 2025

Author Spotlight: Transmitochondrial Cybrid Generation Using Cancer Cell Lines
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Author Spotlight: Transmitochondrial Cybrid Generation Using Cancer Cell Lines

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MITOCHONDRIAL CHOLESTEROL AND CANCER.

Carmen Garcia-Ruiz1, Laura Conde de la Rosa2, Vicent Ribas2

  • 1Department of Cell Death and Proliferation, Institute of Biomedical Research of Barcelona (IIBB), CSIC, Barcelona, Spain; Liver Unit, Hospital Clinic I Provincial de Barcelona, Instituto de Investigaciones Biomédicas August Pi i Sunyer (IDIBAPS), Barcelona, Spain; Center for the Study of Liver and Gastrointestinal Diseases (CIBERehd), Carlos III National Institute of Health, Madrid, Spain; Center for ALPD, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States.

Seminars in Cancer Biology
|August 18, 2020
PubMed
Summary

Mitochondrial cholesterol, not just total cholesterol, influences cancer cell proliferation and chemotherapy resistance. Understanding its role, particularly in liver cancer, may reveal new therapeutic strategies.

Keywords:
Mevalonate pathwayStARD1chemotherapyfree cholesterolhepatocellular carcinomaoxysterols

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Oncology

Background:

  • Cholesterol is vital for cell membranes and cancer cell proliferation.
  • Epidemiologic links between cholesterol and cancer are inconsistent.
  • Mitochondrial cholesterol's role in cancer is understudied but physiologically significant.

Purpose of the Study:

  • To review the regulation and function of mitochondrial cholesterol.
  • To highlight mitochondrial cholesterol's contribution to cancer development and progression.
  • To explore its role in hepatocellular carcinoma and chemotherapy resistance.

Main Methods:

  • Literature review of mitochondrial cholesterol metabolism.
  • Analysis of cholesterol's impact on mitochondrial function.
  • Examination of oxysterol signaling pathways.

Main Results:

  • Mitochondrial cholesterol influences mitochondrial function and cell death.
  • It plays a role in chemotherapy resistance.
  • Oxysterols derived from mitochondrial cholesterol regulate cell proliferation.

Conclusions:

  • Mitochondrial cholesterol is a key regulator of cancer cell biology.
  • Targeting mitochondrial cholesterol metabolism offers potential cancer therapeutic avenues.
  • Further research is crucial, especially for obesity-related cancers like hepatocellular carcinoma.