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Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
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Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
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Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death.  Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
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After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...
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Related Experiment Video

Updated: Jul 12, 2025

In Vitro and In Vivo Detection of Mitophagy in Human Cells, C. Elegans, and Mice
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Targeting mitochondrial degradation by chimeric autophagy-tethering compounds.

Zhenqi Liu1,2, Geng Qin1,2, Jie Yang1,2

  • 1Laboratory of Chemical Biology, State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences Changchun Jilin 130022 P. R. China xqu@ciac.ac.cn.

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|October 20, 2023
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Summary

Researchers developed mito-ATTECs, small molecules that trigger mitophagy, or mitochondrial degradation, by linking LC3-binding fragments to mitochondria. This approach induces cancer cell death, particularly in apoptosis-resistant melanoma, offering a new therapeutic strategy.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Medicine

Background:

  • Regulating mitophagy, the process of degrading mitochondria via autophagy, with small molecules is challenging.
  • Current methods for mitophagy induction can disrupt mitochondrial integrity.
  • Understanding mitophagy's role is crucial for various physiological and pathological processes.

Purpose of the Study:

  • To develop a novel biochemical approach to precisely regulate mitophagy using small molecules.
  • To investigate the potential of this approach in inducing cancer cell death, especially in apoptosis-resistant tumors.
  • To establish a versatile tool for studying the physiological functions of mitophagy.

Main Methods:

  • Design and synthesis of mito-ATTECs, chimera molecules linking LC3-binding moieties to mitochondria-targeting ligands.
  • Demonstration of mito-ATTECs' ability to target mitochondria to autophagosomes via direct interaction with LC3.
  • Evaluation of mito-ATTECs' efficacy in inducing mitochondrial degradation, cell death, and therapeutic effects in melanoma models.

Main Results:

  • Mito-ATTECs successfully triggered mitophagy by bridging mitochondria and autophagosomes through LC3 interaction.
  • This method avoids detrimental effects associated with disrupting mitochondrial membrane integrity.
  • Sustained mitophagy induced by mito-ATTECs led to "lethal mitophagy" and cell death in malignant cell lines, notably apoptosis-resistant melanoma.
  • Therapeutic efficacy was confirmed in preclinical melanoma models.

Conclusions:

  • Mito-ATTECs provide a versatile and safe biochemical strategy to modulate mitophagy.
  • Targeted induction of lethal mitophagy represents a promising therapeutic paradigm for apoptosis-resistant cancers.
  • This approach facilitates the investigation of mitophagy's physiological roles and therapeutic potential.