Lab Notes: Cell Signaling Archives - Laboratory Notes

Insulin Signaling

admin — Fri, 04 Sep 2026 10:02:13 +0000

Insulin signaling is a complex network of molecular pathways activated when insulin binds to its receptor. Through insulin receptor substrates, PI3K-Akt, MAP kinase pathways, GLUT4 trafficking, and other signaling mechanisms, insulin regulates glucose uptake, glycogen synthesis, lipid metabolism, protein synthesis, nutrient sensing, and cellular metabolism. Impaired insulin signaling is a major feature of insulin resistance and metabolic dysfunction.

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PI3K-Akt Signaling

admin — Fri, 04 Sep 2026 10:01:10 +0000

PI3K-Akt signaling is a major intracellular pathway involved in metabolism, growth, survival, and gene regulation. Activated by insulin and other extracellular signals, the pathway connects receptors and IRS proteins with PI3K, PIP3, Akt, GLUT4, FOXO, mTORC1, and other downstream targets. Its functions are particularly important for glucose uptake, glycogen synthesis, lipid metabolism, protein synthesis, and insulin sensitivity.

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Insulin Receptor

admin — Fri, 04 Sep 2026 09:48:04 +0000

The insulin receptor is a cell-surface receptor tyrosine kinase that plays a central role in insulin signaling and metabolic regulation. When insulin binds to the receptor, it activates receptor autophosphorylation and downstream signaling through IRS proteins, PI3K-Akt, MAP kinase, GLUT4, and other pathways. These signals regulate glucose uptake, glycogen synthesis, lipid metabolism, protein metabolism, cell growth, and energy balance. Understanding the insulin receptor provides a foundation for understanding insulin sensitivity, insulin resistance, hyperinsulinemia, and metabolic disease.

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