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Role of ER in the Secretory Pathway01:17

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Eukaryotic cells have a special pathway that enables communication between various intracellular membrane-bound compartments and also with the extracellular environment. This pathway is termed as the secretory pathway.
Components of the secretory pathway
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Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
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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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Smooth endoplasmic reticulum or smooth ER is a sub-organelle with specialized functions in animal cells and plant cells. It is often associated with the tubule morphology of the endoplasmic reticulum.
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The Body Mass Index (BMI) is a numerical value derived from a person's weight and height, used to categorize individuals into weight ranges. It is calculated using the formula: weight in kilograms divided by height in meters squared. Obesity is a health condition characterized by excessive accumulation of adipose tissue that poses health risks, often diagnosed with a BMI ≥ 30. This excess fat storage occurs when surplus dietary calories are converted into triglycerides and stored in...
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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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Endoplasmic Reticulum Stress and Obesity.

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Obesity is linked to insulin resistance and inflammation due to impaired protein homeostasis and endoplasmic reticulum (ER) stress. Understanding these mechanisms is key to developing treatments for metabolic disorders like type 2 diabetes.

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Area of Science:

  • Metabolic Regulation
  • Cellular Homeostasis
  • Inflammation Biology

Background:

  • Rising global obesity rates are associated with insulin resistance and chronic low-grade inflammation.
  • Obesity-related insulin resistance and inflammation involve complex metabolic dysregulation.
  • Endoplasmic reticulum (ER) dysfunction and unfolded protein response (UPR) activation are implicated in these processes.

Purpose of the Study:

  • To investigate the mechanisms linking obesity, insulin resistance, and inflammation.
  • To explore the role of protein homeostasis and ER stress in metabolic dysfunction.
  • To identify potential therapeutic targets for obesity-related conditions.

Main Methods:

  • The study reviews existing literature on obesity, inflammation, and ER stress.
  • It focuses on the interplay between protein folding, quality control, and ER-associated degradation.
  • Analysis of factors triggering the unfolded protein response (UPR) in metabolic contexts.

Main Results:

  • Faulty protein homeostasis, including impaired protein folding and ER-associated degradation, contributes to ER stress.
  • ER stress disrupts cellular homeostasis and metabolic signaling pathways.
  • Various conditions, such as altered calcium levels and nutrient deprivation, can activate the UPR.

Conclusions:

  • Dysfunctional protein homeostasis and ER stress are significant contributors to obesity-related insulin resistance and inflammation.
  • Targeting ER stress pathways may offer novel therapeutic strategies for metabolic diseases.
  • Further research is needed to fully elucidate these complex mechanisms and develop effective interventions for type 2 diabetes.