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Electron Transport Chain: Complex I and II

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...

Adaptive Mechanisms in Cancer Cells

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 Cells

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,...

Mitochondria

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,...

Mitochondria

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 Membranes

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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Related Experiment Video

Updated: May 18, 2026

Transmitochondrial Cybrid Generation Using Cancer Cell Lines

Transmitochondrial Cybrid Generation Using Cancer Cell Lines

Published on: March 17, 2023

Mitochondria and cancer.

Douglas C Wallace¹

¹Children's Hospital of Philadelphia, Center for Mitochondrial and Epigenomic Medicine, Philadelphia, Pennsylvania 19104, USA. wallacedl@email.chop.edu

Nature Reviews. Cancer

|September 25, 2012

Summary

This summary is machine-generated.

Functional mitochondria are crucial for cancer cells, altering their energy and biosynthesis. Cancer cells utilize mitochondrial retrograde signaling to reprogram the nucleus and surrounding stromal cells for growth.

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Analytical Determination of Mitochondrial Function of Excised Solid Tumor Homogenates

Analytical Determination of Mitochondrial Function of Excised Solid Tumor Homogenates

Published on: August 6, 2021

Area of Science:

Mitochondrial biology and cancer metabolism.

Background:

Conventional wisdom suggests mitochondria are dispensable or detrimental in cancer.
Mitochondrial gene mutations are frequent in cancer but do not abolish energy metabolism.

Purpose of the Study:

To investigate the role of functional mitochondria in cancer cell biology.
To elucidate the mechanisms by which mitochondria influence cancer progression and the tumor microenvironment.

Main Methods:

Analysis of mitochondrial bioenergetic and biosynthetic states in cancer cells.
Investigation of mitochondrial retrograde signaling pathways.
Assessment of cancer cell reprogramming of adjacent stromal cells.

Main Results:

Mitochondrial gene mutations alter, rather than inactivate, mitochondrial energy metabolism.
Altered mitochondrial states communicate with the nucleus via retrograde signaling.
Cancer cells reprogram stromal cells to optimize the tumor microenvironment.

Conclusions:

Functional mitochondria are essential for cancer cell survival and proliferation.
Mitochondrial retrograde signaling plays a key role in cancer adaptation and progression.
Cancer cells exploit developmental and stress-response pathways through mitochondrial reprogramming.