Inhibitors of advanced glycation and endoplasmic reticulum stress

Reiko Inagi1

  • 1Division of Nephrology and Endocrinology, University of Tokyo School of Medicine, Tokyo, Japan.

Methods in Enzymology
|February 19, 2011
PubMed

Insights

Advanced glycation endproducts (AGEs) contribute to various diseases by damaging proteins and DNA. Inhibiting AGE formation may help manage endoplasmic reticulum (ER) stress and related conditions.

Area of Science:

  • Biochemistry
  • Pathophysiology
  • Molecular Biology

Background:

  • Advanced glycation is a key posttranslational modification involving nonenzymatic reactions.
  • Oxidative stress and hyperglycemia lead to the formation of advanced glycation endproducts (AGEs).
  • AGEs contribute to the pathogenesis of diabetic complications, neurodegenerative diseases, atherosclerosis, and kidney disease.

Purpose of the Study:

  • To explore the link between advanced glycation and endoplasmic reticulum (ER) stress.
  • To investigate the role of hypoxia in initiating advanced glycation.
  • To evaluate AGE formation inhibitors as potential modulators of ER stress.

Main Methods:

  • Review of existing literature on advanced glycation and ER stress.
  • Analysis of the interplay between metabolic disturbances and cellular stress pathways.
  • Exploration of therapeutic strategies targeting AGE formation.

Main Results:

  • Advanced glycation is implicated in a wide range of diseases beyond diabetes.
  • Hypoxia, in addition to oxidative stress, can initiate advanced glycation.
  • Cross-talk exists between advanced glycation and ER stress, influencing disease progression.

Conclusions:

  • Advanced glycation and ER stress are interconnected in disease pathogenesis.
  • Inhibitors of AGE formation show potential for modulating ER stress.
  • Targeting AGE formation could offer novel therapeutic avenues for metabolic and stress-related disorders.

Related Concept Videos

Export of Misfolded Proteins out of the ER01:32

Export of Misfolded Proteins out of the ER

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...
Protein Folding Quality Check in the RER01:29

Protein Folding Quality Check in the RER

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...
Role of ER in the Secretory Pathway01:17

Role of ER in the Secretory Pathway

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
About a third of proteins synthesized in the cell are sorted via the secretory route. They shuffle between different compartments in membrane-bound vesicles until they reach their final destination. The main intracellular compartments involved...
The Unfolded Protein Response01:37

The Unfolded Protein Response

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...
Dipeptidyl Peptidase 4 Inhibitors01:23

Dipeptidyl Peptidase 4 Inhibitors

Dipeptidyl peptidase 4 (DPP-4) is a serine protease widely distributed in the body. It's involved in the inactivation of GLP-1 and GIP hormones, which are crucial for insulin regulation. DPP-4 inhibitors, such as sitagliptin (Januvia), saxagliptin (Onglyza), linagliptin (Tradjenta), alogliptin (Nesina), and vildagliptin (Galvus), help increase the proportion of active GLP-1, enhancing insulin secretion. These inhibitors work by competitively binding to DPP-4. This binding causes a significant...
Oral Hypoglycemic Agents: α-Glucosidase Inhibitors01:19

Oral Hypoglycemic Agents: α-Glucosidase Inhibitors

α-glucosidase inhibitors, including acarbose (Precose), miglitol (Glyset), and voglibose (Voglib) (primarily available in Asia), are drugs that control blood sugar levels by delaying the digestion of starch and disaccharides. They achieve this by inhibiting α-glucosidase enzymes in the intestine, which slow the absorption of carbohydrates in the intestine, which in turn leads to a prolonged release of the glucoregulatory hormone GLP-1 from intestinal L-cells.
Acarbose and miglitol are typically...