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Related Concept Videos

Adaptive Mechanisms in Cancer Cells02:53

Adaptive Mechanisms in Cancer Cells

Cancer cells accumulate genetic changes at an abnormally rapid rate due to the defects in the DNA repair mechanisms. From an evolutionary perspective, such genetic instability is advantageous for cancer development. Mutant cell lines accumulate a series of beneficial mutations that contribute to their progression into cancer.
Some of the advantages that cancer cells have on normal cells include - enhanced ability to divide without terminally differentiating, induce new blood vessel formation,...
Adaptive Mechanisms in Cancer Cells02:53

Adaptive Mechanisms in Cancer Cells

Cancer cells accumulate genetic changes at an abnormally rapid rate due to the defects in the DNA repair mechanisms. From an evolutionary perspective, such genetic instability is advantageous for cancer development. Mutant cell lines accumulate a series of beneficial mutations that contribute to their progression into cancer.
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Abnormal Proliferation02:23

Abnormal Proliferation

Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...
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.
ROS generation is regulated and maintained at moderate levels necessary...
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,...
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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Transmitochondrial Cybrid Generation Using Cancer Cell Lines
07:49

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Published on: March 17, 2023

Mitochondrial dysfunction in cancer cells due to aberrant mitochondrial replication.

Yuriy Shapovalov1, David Hoffman, Daniel Zuch

  • 1The Center for Musculoskeletal Research, University of Rochester School of Medicine and Dentistry, Rochester, New York 14642, USA.

The Journal of Biological Chemistry
|May 4, 2011
PubMed
Summary

Cancer cells exhibit the Warburg effect, relying on glycolysis. This study reveals that increased mitochondrial replication, driven by mitochondrial single-strand DNA-binding protein (mtSSB), contributes to mitochondrial dysfunction and cancer cell survival.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cancer Research

Background:

  • The Warburg effect, characterized by increased glycolysis and altered oxidative metabolism, is a hallmark of cancer.
  • Cancer cells utilize glycolysis for survival advantages, necessitating investigation into underlying molecular mechanisms.

Purpose of the Study:

  • To investigate the molecular mechanisms driving the Warburg effect in cancer.
  • To explore the role of mitochondrial replication and function in osteosarcoma progression.

Main Methods:

  • Comparative analysis of oxygen consumption in osteoblasts and osteosarcoma cell lines (Saos2, 143B).
  • Evaluation of mitochondrial morphology and function using electron microscopy and quantitative PCR.
  • Gene expression analysis of mitochondrial single-strand DNA-binding protein (mtSSB) and mitochondrial respiratory complexes.
  • Gain- and loss-of-function experiments involving mtSSB overexpression and knockdown.

Main Results:

  • Aggressive osteosarcoma cells (143B) showed decreased oxygen consumption, enlarged mitochondria, and increased mtDNA compared to less aggressive cells and osteoblasts.
  • Upregulation of mtSSB in 143B cells correlated with hyperactive mitochondrial replication and reduced respiratory complex activity.
  • Overexpression of mtSSB in Saos2 cells increased mtDNA and decreased oxygen consumption.
  • Knockdown of mtSSB in 143B cells reduced mtDNA, increased oxygen consumption, and inhibited cell growth in vitro and in vivo.

Conclusions:

  • Mitochondrial dysfunction in cancer cells is linked to abnormally increased mitochondrial replication.
  • Overexpression of mtSSB appears to be a key driver of this hyperactive mitochondrial replication.
  • mtSSB represents a potential therapeutic target for cancer treatment.