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Explore the intricate mechanisms of phosphoinositide-dependent signaling pathways that occur downstream of receptor tyrosine kinase (RTK) activation in this 33-minute lecture. Delve into the critical roles of PI3K kinase and phospholipase C-gamma (PLC-γ) in mediating cellular responses following RTK stimulation. Learn how these key enzymes regulate signal transduction cascades through phosphoinositide metabolism, understanding their specific functions in converting extracellular signals into intracellular responses. Examine the molecular mechanisms by which PI3K generates phosphatidylinositol 3,4,5-trisphosphate (PIP3) and how PLC-γ cleaves phosphatidylinositol 4,5-bisphosphate (PIP2) to produce inositol trisphosphate (IP3) and diacylglycerol (DAG). Discover how these lipid messengers coordinate downstream signaling events that control cellular processes such as proliferation, differentiation, survival, and metabolism. Gain insights into the regulatory networks that ensure proper signal transmission and the potential consequences when these pathways become dysregulated in disease states.
