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Amyloid Fibrils

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Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
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The ER is the hub of protein synthesis in a cell. It has robust systems to quality control protein folding and also for degradation of terminally misfolded proteins. Under normal conditions, a small proportion of misfolded proteins that cannot be salvaged need to be transported to the cytoplasm by the ER-associated degradation or ERAD pathways. However, if the ERAD cannot handle the misfolded proteins, the cell activates the unfolded protein response or UPR to adjust the protein folding...
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ER is the primary site for the maturation and folding of soluble and transmembrane secretory proteins. The calnexin cycle is a specific chaperone system that folds and assesses the confirmation of N-glycosylated proteins before they can exit the ER lumen. The primary players of this quality check pipeline are the lectins, ER-resident chaperones, and a glucosyl transferase enzyme. In case the calnexin system in the lumen fails to salvage a misfolded protein, it is transported to the cytoplasm...
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Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
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Quantifying Tissue-Specific Proteostatic Decline in Caenorhabditis elegans
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ER Dysfunction and Protein Folding Stress in ALS.

Soledad Matus1, Vicente Valenzuela, Danilo B Medinas

  • 1Neurounion Biomedical Foundation, Santiago, Chile.

International Journal of Cell Biology
|December 11, 2013
PubMed
Summary

Endoplasmic reticulum (ER) stress and unfolded protein response (UPR) disruptions are increasingly linked to Amyotrophic Lateral Sclerosis (ALS). Research highlights ER stress

Area of Science:

  • Neuroscience
  • Cellular Biology
  • Biochemistry

Background:

  • Amyotrophic lateral sclerosis (ALS) is a prevalent adult paralytic disease, often sporadic.
  • Protein homeostasis disruption, endoplasmic reticulum (ER) stress, and protein aggregate accumulation are hallmarks in ALS.
  • ER stress and the unfolded protein response (UPR) pathway show complex involvement in ALS models.

Purpose of the Study:

  • To review recent scientific advances on the causal role of ER stress in ALS.
  • To explore the connection between protein homeostasis, ER stress, and ALS pathogenesis.
  • To discuss the potential of ER stress biomarkers in ALS progression monitoring.

Main Methods:

  • Literature review of recent studies on ER stress and ALS.
  • Analysis of experimental models and patient-derived tissues.

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  • Examination of pharmacological and genetic manipulation of UPR in ALS.

    • Main Results:

    • Evidence increasingly supports a causal role for ER stress in ALS.
    • UPR pathway modulation impacts experimental ALS models.
    • ER stress-responsive chaperones in body fluids are potential ALS biomarkers.

    Conclusions:

    • ER stress is a significant contributing factor to ALS pathogenesis.
    • Targeting ER stress pathways may offer therapeutic strategies for ALS.
    • Biomarkers related to ER stress could aid in ALS diagnosis and monitoring.