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Related Concept Videos

Mitochondrial Membranes01:45

Mitochondrial Membranes

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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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Mitochondria01:37

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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,...
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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
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The Inner Mitochondrial Membrane01:28

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The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
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Mitochondrial Precursor Proteins01:39

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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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Related Experiment Video

Updated: Oct 28, 2025

Optical Sectioning and Visualization of the Intervertebral Disc from Embryonic Development to Degeneration
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Mitochondrial quality control in intervertebral disc degeneration.

Yu Song1, Saideng Lu1, Wen Geng2

  • 1Department of Orthopaedics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China.

Experimental & Molecular Medicine
|July 17, 2021
PubMed
Summary

Mitochondrial quality control (MQC) is crucial for intervertebral disc health. Disruptions in MQC contribute to disc degeneration, offering potential therapeutic targets for low back pain.

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A Proinflammatory, Degenerative Organ Culture Model to Simulate Early-Stage Intervertebral Disc Disease.
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Area of Science:

  • Biochemistry
  • Cell Biology
  • Orthopedics

Background:

  • Intervertebral disc degeneration (IDD) is a prevalent cause of low back pain, necessitating a deeper understanding of its molecular underpinnings.
  • Mitochondria, previously overlooked, are now recognized for their role in regulating disc metabolism and function, especially given the avascular nature of intervertebral discs.
  • Structural and functional mitochondrial impairments are evident in degenerated disc cells.

Purpose of the Study:

  • To review the current knowledge on mitochondrial function in intervertebral disc degeneration (IDD).
  • To explore the role of mitochondrial quality control (MQC) mechanisms in maintaining nucleus pulposus (NP) cell function during IDD.
  • To summarize potential therapeutic strategies targeting MQC for IDD intervention.

Main Methods:

  • Literature review focusing on mitochondrial function and MQC in intervertebral disc degeneration.
  • Analysis of evidence linking MQC pathways (integrity, proteostasis, antioxidant systems, dynamics, mitophagy, biogenesis) to NP cell function.
  • Synthesis of current research on therapeutic interventions targeting MQC for IDD.

Main Results:

  • Mitochondrial dysfunction is a key feature of degenerated intervertebral discs.
  • MQC pathways are critical for maintaining mitochondrial health and NP cell viability.
  • Both protective and detrimental roles of MQC in IDD progression are observed, depending on the specific mechanisms involved.

Conclusions:

  • Mitochondrial function and MQC are central to the pathogenesis of intervertebral disc degeneration.
  • Targeting MQC pathways presents a promising avenue for developing novel therapeutic strategies for IDD and associated low back pain.
  • Further research into the complex interplay of MQC mechanisms is needed to optimize IDD treatments.