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case 1£º trkAÐźŴ«µ¼Í¨Â·
TRKA Signaling
Neurotrophic tyrosine kinase receptor type 1 (TrkA), is the high affinity receptor for nerve growth factor (NGF). Activation of TrkA by NGF promotes survival, growth (mitosis) and/or differentiation of specific neuronal cell populations including sympathetic neurons, neural crest-derived sensory neurons, and basal forebrain cholinergic neurons. Specific cell responses to NGF-dependent TrkA-activation depend upon the balance of associated adaptor and kinase proteins and cell context.

TrkA activation typically leads to the activation of survival and growth mediating pathways through cytoplasmic proteins SHC; PI3-kinase and PLCgamma1. PI3-kinase activates the PDK-1/AKT(PKB) pathway that supports cell survival and protein synthesis. SHC provides a docking site for GRB2/SOS activation of the Ras/Raf/MEK/ERK growth promoting pathway and PLCgamma1 supports activation of the PKC pathway. While withdrawal of NGF leads to apoptosis, over expression of TrKA may also induce a switch from an ERK/CREB-dependent anti-apoptotic to a MEK3/6-p38MAP-dependent pro-apoptotic condition. PLC-gamma1 activity is involved in switching between anti-mitogenic and mitogenic signaling.

NGF-activated TrkA can promote cell growth (proliferation) or differentiation (neurite out-growth) of neurons depending on cell context. SHC regulates proliferation and Suc1-associated neurotrophic factor-induced tyrosine phosphorylation target (SNT-1)/fibroblast growth factor receptor substrate 1 (FRS-2) regulates differentiation. SHC and SNT-1/FRS-2 compete for the same site on TrkA. FRS-2 binds Grb-2, Crk, Sh-PTP-2, cyclin-dependent kinase substate (suc1) and Src. These factors link TrkA to the cell cycle. NGF activated TrkA can regulate development of the axonal cytoskeleton structures through a pathway that involves the non-receptor tyrosine kinase, c-Abl, c-Crk adaptor proteins and paxillin. Crk adaptor proteins are involved in the regulation of proliferation, anchorage-dependent DNA synthesis and cytoskeletal reorganization.

case 2£º wntÐźŴ«µ¼Í¨Â·
The Wnt pathway involves a large number of proteins that can regulate the production of Wnt signaling molecules, their interactions with receptors on target cells and the physiological responses of target cells that result from the exposure of cells to the extracellular Wnt ligands. Although the presence and strength of any given effect depends on the Wnt ligand, cell type, and organism, some components of the signaling pathway are remarkably conserved in a wide variety of organisms, from Caenorhabditis elegans to humans. Protein homology suggests that several distinct Wnt ligands were present in the common ancestor of all bilaterian life, and certain aspects of Wnt signaling are present in sponges and even in slime molds.

The canonical Wnt pathway describes a series of events that occur when Wnt proteins bind to cell-surface receptors of the Frizzled family, causing the receptors to activate Dishevelled family proteins and ultimately resulting in a change in the amount of ¦Â-catenin that reaches the nucleus (Figure 2). Dishevelled (DSH) is a key component of a membrane-associated Wnt receptor complex (Figure 2) which, when activated by Wnt binding, inhibits a second complex of proteins that includes axin, GSK-3, and the protein APC (Figure 1). The axin/GSK-3/APC complex normally promotes the proteolytic degradation of the ¦Â-catenin intracellular signaling molecule. After this "¦Â-catenin destruction complex" is inhibited, a pool of cytoplasmic ¦Â-catenin stabilizes, and some ¦Â-catenin is able to enter the nucleus and interact with TCF/LEF family transcription factors to promote specific gene expression (interaction 2, Figure 2). Some additional details of the pathway are described below.

Cell surface Frizzled (FRZ) proteins usually interact with a transmembrane protein called LRP (Figure 2).[8] LRP binds Frizzled, Wnt and axin and may stabilize a Wnt/Frizzled/LRP/Dishevelled/axin complex at the cell surface ("receptor complex" in Figure 2).

In vertebrates, several secreted proteins have been described that can modulate Wnt signaling by either binding to Wnts[9] or binding to a Wnt receptor protein. For example, Sclerostin (not shown in a figure) can bind to LRP and inhibit Wnt signaling.[10]

The part of the pathway linking the cell surface Wnt-activated Wnt receptor complex to the prevention of ¦Â-catenin degradation is still under investigation. There is evidence that trimeric G proteins (G in Figure 2) can function downstream from Frizzled.[11] It has been suggested that Wnt-activated G proteins participate in the disassembly of the axin/GSK3 complex.[12]

Several protein kinases and protein phosphatases have been associated with the ability of the cell surface Wnt-activated Wnt receptor complex to bind axin and disassemble the axin/GSK3 complex.[13] Phosphorylation of the cytoplasmic domain of LRP by CK1 and GSK3 can regulate axin binding to LRP (interaction 1 in Figure 2). The protein kinase activity of GSK3 appears to be important for both the formation of the membrane-associated Wnt/FRZ/LRP/DSH/Axin complex and the function of the Axin/APC/GSK3/¦Â-catenin complex. Phosphorylation of ¦Â-catenin by GSK3 leads to the destruction of ¦Â-catenin (Figure 1).
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