Insulin signaling and beta-cell stress pathways

The insulin signaling and beta-cell stress pathways are integrated systems essential for maintaining blood glucose levels within a narrow physiological range. The insulin signaling pathway is triggered when insulin binds to its transmembrane receptor, initiating a phosphorylation cascade through insulin receptor substrates (IRS) and activating the PI3K/AKT pathway to promote glucose uptake in muscle and adipose tissue (Saltiel & Kahn, 2001, Nature). Simultaneously, pancreatic beta-cells must manage the high protein-folding load associated with insulin synthesis. When this load exceeds the capacity of the endoplasmic reticulum (ER), the unfolded protein response (UPR) is activated to restore cellular balance (Back & Kaufman, 2012, Annual Review of Biochemistry). However, chronic overstimulation of these pathways, often due to insulin resistance or obesity, leads to persistent ER stress and eventual beta-cell apoptosis, which are central drivers of type 2 diabetes progression (Eizirik et al., 2020, Nature Reviews Endocrinology). Therapeutic agents targeting these pathways include insulin analogs, GLP-1 receptor agonists that enhance beta-cell survival, and insulin sensitizers like thiazolidinediones (Nauck et al., 2021, Molecular Metabolism). Emerging research also explores chemical chaperones and UPR modulators to directly alleviate beta-cell stress and preserve functional cell mass (Engin et al., 2013, Science Translational Medicine).

Other names

Insulin signaling cascadeBeta-cell ER stress responseInsulin-PI3K-AKT signaling pathwayPancreatic beta-cell unfolded protein response (UPR)

Activation of insulin receptor signaling, enhancement of glucose transporter translocation, potentiation of glucose-dependent insulin secretion, and mitigation of endoplasmic reticulum stress-induced apoptosis.