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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.
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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...
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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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The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
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Tumor progression is a phenomenon where the pre-formed tumor acquires successive mutations to become clinically more aggressive and malignant. In the 1950s, Foulds first described the stepwise progression of cancer cells through successive stages.
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Related Experiment Video

Updated: Aug 27, 2025

Spatial and Temporal Control of Murine Melanoma Initiation from Mutant Melanocyte Stem Cells
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MCU controls melanoma progression through a redox-controlled phenotype switch.

Ioana Stejerean-Todoran1, Katharina Zimmermann2, Christine S Gibhardt1

  • 1Molecular Physiology, Department of Cardiovascular Physiology, University Medical Center, Georg-August-University, Göttingen, Germany.

EMBO Reports
|September 26, 2022
PubMed
Summary

Mitochondrial calcium uptake (MCU) complex subunit A (MCUA) is crucial for melanoma progression and therapeutic resistance. Lower MCUA expression worsens patient survival and promotes metastasis, impacting treatment strategies for advanced melanoma.

Keywords:
MCUROScalciummelanomamitochondria

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A Robust Discovery Platform for the Identification of Novel Mediators of Melanoma Metastasis

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Area of Science:

  • Oncology
  • Cell Biology
  • Metabolism

Background:

  • Melanoma is an aggressive skin cancer with high metastatic potential.
  • Calcium signaling and metabolic pathways are implicated in melanoma invasiveness, but molecular mechanisms remain unclear.
  • The mitochondrial calcium uptake (MCU) complex's role in melanoma pathobiology was previously unknown.

Purpose of the Study:

  • To investigate the role of the MCU complex subunit A (MCUA) in melanoma progression and therapeutic sensitivity.
  • To elucidate the molecular links between MCUA, melanoma cell phenotype, and redox regulation.

Main Methods:

  • Analysis of MCUA expression in melanoma patient survival data and BRAF inhibitor-resistant melanoma.
  • MCUA knockdown (KD) experiments in melanoma cell lines and xenografts.
  • Proteomic analyses and protein microarrays to identify molecular pathways.
  • Assessment of melanoma cell response to antioxidants, prooxidants, immunotherapies, and ferroptosis.

Main Results:

  • MCUA expression inversely correlates with melanoma patient survival and is reduced in resistant melanomas.
  • MCUA KD suppresses tumor growth but enhances lung metastasis in vivo.
  • MCUA influences melanoma cell phenotype through redox regulation pathways.
  • MCUA KD increases resistance to immunotherapies and ferroptosis.

Conclusions:

  • MCUA is a key regulator of melanoma aggressiveness, metastasis, and therapeutic sensitivity.
  • Targeting mitochondrial calcium and redox homeostasis may offer novel therapeutic strategies for advanced melanoma.