What mechanisms are involved in insulin receptor activation and how do these pathways facilitate glucose uptake and other metabolic processes in target tissues?
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What mechanisms are involved in insulin receptor activation and how do these pathways facilitate glucose uptake and other metabolic processes in target tissues?
1. Insulin binds to its receptor, triggering autophosphorylation, activating PI3K and AKT pathways, thereby promoting GLUT4 translocation and glucose uptake.
2. Upon insulin binding, the receptor dimerizes and phosphorylates IRS proteins, activating PI3K, enhancing glucose uptake through GLUT4 and glycogen synthesis.
3. Insulin receptor activation involves tyrosine kinase activity, leading to cascades like MAPK for cell growth and PI3K/AKT for metabolic functions, including glucose uptake.
4. The insulin receptor, when activated by insulin, undergoes conformational changes, phosphorylates IRS, activating downstream pathways (PI3K, AKT) that regulate metabolic processes and glucose uptake.