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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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Cancer therapies are various modes of treatment, such as surgery, radiation therapy, and chemotherapy that are administered to cancer patients.
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Related Experiment Video

Updated: Jul 8, 2026

Enhancement of Apoptotic and Autophagic Induction by a Novel Synthetic C-1 Analogue of 7-deoxypancratistatin in Human Breast Adenocarcinoma and Neuroblastoma Cells with Tamoxifen

Enhancement of Apoptotic and Autophagic Induction by a Novel Synthetic C-1 Analogue of 7-deoxypancratistatin in Human Breast Adenocarcinoma and Neuroblastoma Cells with Tamoxifen

Published on: May 30, 2012

Mitochondriotoxic compounds for cancer therapy.

V R Fantin¹, P Leder

¹Merck & Co. Inc., Boston, MA, USA. valeria_fantin@merck.com

|August 8, 2006

Summary

Cancer cells resist apoptosis, hindering treatment. Targeting mitochondria, crucial for cell death, offers a promising strategy to overcome this resistance and improve cancer therapy outcomes.

Area of Science:

Oncology
Cell Biology
Biochemistry

Background:

Cancer cells exhibit resistance to apoptosis, a key cell death pathway.
Defects in the intrinsic apoptosis pathway provide a survival advantage in the tumor microenvironment.
This resistance also contributes to therapeutic resistance against radiation and chemotherapy.

Purpose of the Study:

To explore mitochondria-targeted compounds for cancer treatment.
To investigate strategies for overcoming apoptosis resistance in cancer.
To leverage the central role of mitochondria in cell death induction.

Main Methods:

Focus on the intrinsic apoptosis pathway.
Investigate alterations in apoptosis regulators.
Explore targeting mitochondria directly.

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An Automated Differential Nuclear Staining Assay for Accurate Determination of Mitocan Cytotoxicity

An Automated Differential Nuclear Staining Assay for Accurate Determination of Mitocan Cytotoxicity

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Published on: March 17, 2023

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Last Updated: Jul 8, 2026

Enhancement of Apoptotic and Autophagic Induction by a Novel Synthetic C-1 Analogue of 7-deoxypancratistatin in Human Breast Adenocarcinoma and Neuroblastoma Cells with Tamoxifen

Enhancement of Apoptotic and Autophagic Induction by a Novel Synthetic C-1 Analogue of 7-deoxypancratistatin in Human Breast Adenocarcinoma and Neuroblastoma Cells with Tamoxifen

Published on: May 30, 2012

An Automated Differential Nuclear Staining Assay for Accurate Determination of Mitocan Cytotoxicity

An Automated Differential Nuclear Staining Assay for Accurate Determination of Mitocan Cytotoxicity

Published on: May 12, 2020

Transmitochondrial Cybrid Generation Using Cancer Cell Lines

Transmitochondrial Cybrid Generation Using Cancer Cell Lines

Published on: March 17, 2023

Main Results:

Mitochondria are central integrators of cell death signaling.
Mitochondrial outer membrane permeabilization is a critical commitment point for cell death.
Blocking anti-apoptotic factors or interfering with mitochondrial functions can trigger cell death.

Conclusions:

Mitochondria-targeted strategies hold potential for cancer therapy.
Overcoming apoptosis resistance is crucial for effective cancer treatment.
Directly inducing mitochondrial outer membrane permeabilization is a viable therapeutic approach.