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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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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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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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Porins are beta-barrel proteins translocated to the mitochondrial outer membrane through the TOM complex into the intermembrane space. Porin precursors bind TIM chaperones within the intermembrane space and are guided to the Sorting and Assembly Machinery complex or SAM complex on the outer mitochondrial membrane.
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Mitochondria, chloroplasts, and gram-negative bacteria have transmembrane, beta-barrel proteins called porins to mediate the free diffusion of ions and metabolites across the membrane. Mitochondrial porin precursors contain conserved amino acid sequences called beta signals at their C-terminal. Beta signals have a  motif of PoXGXXHyXHy (Po-Polar, X-Any amino acid, G-Glycine, Hy-LargeHydrophobic), which are crucial for precursor recognition to initiate precursor assembly. Beta-barrel...
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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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Ceramides and mitochondrial homeostasis.

Song Ding1, Guorui Li1, Tinglv Fu1

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Lipotoxicity, driven by excess fatty acids, leads to cell damage. This review explores how ceramides disrupt mitochondrial energy and quality control, impacting cellular health.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Metabolic Disorders

Background:

  • Lipotoxicity results from lipid buildup in non-adipose tissues, causing cellular dysfunction.
  • Ceramides, toxic lipid byproducts, are key mediators of lipotoxicity, influencing apoptosis, senescence, and cell adhesion.
  • Mitochondria are central to cellular energy and homeostasis, but are vulnerable to metabolic stress.

Approach:

  • This review synthesizes current research on ceramide accumulation and its effects on mitochondrial function.
  • It examines the impact of ceramides on mitochondrial energy metabolism, including ATP production and oxidative stress.
  • The review also addresses ceramide's role in mitochondrial quality control mechanisms.

Key Points:

  • Excessive ceramide accumulation disrupts mitochondrial homeostasis, affecting ATP production and oxidative stress.
  • Ceramides impair mitochondrial quantity and quality control, crucial for cellular health.
  • Understanding ceramide-mitochondria interactions is vital for addressing lipotoxicity-related diseases.

Conclusions:

  • Ceramides play a critical role in mediating lipotoxicity through mitochondrial dysfunction.
  • Targeting ceramide metabolism or mitochondrial pathways may offer therapeutic strategies for lipotoxicity.
  • Further research is needed to fully elucidate the complex interplay between ceramides and mitochondria.