Endoplasmic Reticulum Stress and Disease

The endoplasmic reticulum is the cell's primary site for folding proteins destined for secretion or the cell surface, and when that process is overwhelmed—by disease, nutrient deprivation, or genetic mutation—the cell activates a coordinated emergency response known as the unfolded protein response (UPR). Researchers study how the three main UPR signaling branches sense misfolded proteins and decide whether to restore normal function or trigger cell death, a decision that turns out to be central to conditions ranging from type 2 diabetes and neurodegeneration to liver disease and cancer. A persistent open question is what tips the balance from adaptive recovery to apoptosis, since the same molecular machinery that protects cells under brief stress can become destructive under chronic conditions. Understanding that threshold, and how ER stress intersects with inflammation and oxidative damage, is driving efforts to develop drugs that selectively modulate UPR pathways in specific disease contexts.

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Keywords

Endoplasmic ReticulumStressUnfolded Protein ResponseER StressCell DeathProtein Folding