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Updated: Nov 10, 2025
08:40
In Vitro and In Vivo Detection of Mitophagy in Human Cells, C. Elegans, and Mice
Published on: November 22, 2017
17.9K
Mitochondrial dysfunction induced by callyspongiolide promotes autophagy-dependent cell death
Soohyun Lee1,2, Yoonjeong Jeong1, Jae-Seok Roe2
1pH Pharma Co., Ltd., Seongnam 13494, Korea.
BMB Reports
|April 1, 2021
Summary
Callyspongiolide R induces cancer cell death by disrupting mitochondrial energy production and triggering autophagy. This marine compound shows potential for synergistic effects with existing anti-cancer drugs.
Area of Science:
- Marine natural products
- Cancer cell biology
- Mitochondrial function
Background:
- Callyspongiolide is a marine macrolide known to induce cancer cell death.
- The precise mechanism of callyspongiolide-induced cell death remains unclear.
- Understanding this mechanism is crucial for potential therapeutic applications.
Purpose of the Study:
- To elucidate the mechanism by which Callyspongiolide R (cally2R) induces cancer cell death.
- To investigate the role of mitochondrial dysfunction and autophagy in cally2R-mediated cell death.
- To explore the synergistic potential of cally2R with established anti-cancer drugs.
Main Methods:
- Mitochondrial complex activity assays
- Measurement of mitochondrial membrane potential and cellular energy levels
- Electron microscopy for autophagosome and mitophagy observation
- Immunofluorescence for LC3 and LAMP2 co-localization
- RNA sequencing for pathway analysis
- Western blotting for key signaling pathway proteins (mTOR, AKT, AMPK)
Main Results:
- Cally2R inhibits mitochondrial complex I or II, leading to energy depletion and disrupted mitochondrial membrane potential.
- Significant autophagosome formation and mitophagy were observed, confirmed by LC3-LAMP2 co-localization indicating autolysosome formation.
- RNA sequencing revealed hypoxia induction and blockade of EGF-dependent pathways, potentially driven by autophagy.
- Autophagy-inhibitory pathways (mTOR, AKT) were repressed, while the autophagy-promoting pathway (AMPK) was upregulated.
- Cally2R demonstrated synergistic cancer cell death when combined with gefitinib, sorafenib, and rapamycin.
Conclusions:
- Callyspongiolide R induces cancer cell death through mitochondrial dysfunction and subsequent autophagy.
- The observed pathway modulation and synergistic effects highlight callyspongiolide's therapeutic potential.
- Callyspongiolide may serve as a valuable agent in combination cancer therapy.
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