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However, there are also examples of recessive basolateral determinants [ 62 , 63 ], indicating that the hierarchy of sorting determinants is more complicated or that their relative strength depends on the protein in which they are present. Integrated activity of PDZ protein complexes regulates epithelial polarity. Disassembly and assembly of plasma membrane domains during reversal of epithelial cell polarity in multicellular epithelial MDCK cysts. However, whether this change of lipid environment is required for accurate targeting is unclear. Immunocytochemical study of the appearance of P2 in developing rat peripheral nerve: comparison with other myelin components.
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Once these axons are completely encircled by Schwann cells, basement membrane is formed around each Schwann cell. Reviewing all the aspects of cell polarization in general is far beyond the scope of this paper, and the interested readers are referred to other papers [ 1 — 6 ]. Integrated activity of PDZ protein complexes regulates epithelial polarity. In this context, another important question is how polarity complexes interact to cross-regulate the trafficking machinery. This compartment seems to ubiquitously exist in the polarized epithelial cells and is morphologically typified by a branching tubulovesicular network that is clustered in the apical region and extends to the cell periphery. Dystroglycan and AMP kinase: polarity's protectors when the power goes out. Each complex recognizes and selectively recruits target proteins into transport vesicles nonrecognized proteins are excluded from vesicles , whereas each complex also deforms and sculpts the membrane to produce the membrane vesicle or a tubule.
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Thus, laminin signaling seems to be mediated at least partly by Fyn, QKI, p27, and Sirt2, and these complex interactions may promote OLG polarization and myelination in multiple ways. Finally, it is worth noting that overall mechanism of cell polarization is just beginning to be understood and further research for unknown components of polarity in Schwann cells is necessary. Role of integrins in the peripheral nervous system. In polarized epithelial cells, PtdIns 3,4,5 P3 is enriched in the basolateral plasma membrane [ ] and recycling endosomes [ ], but is absent from the apical in which PtdIns 4,5 P2 is enriched [ ]. Drosophila Crumbs is a positional cue in photoreceptor adherens junctions and rhabdomeres.
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In cultured mammary epithelial cells, dystroglycan was required in laminin-induced polarity, beta-casein production, and laminin assembly at the step of laminin binding to the cell surface [ ]. Control of myelin formation by basal lamina. Considering anatomical and molecular polarity of Schwann cells described previously, Schwann cell microvilli at nodal region may be included in apical domain. Uncovering multiple axonal targeting pathways in hippocampal neurons. PMP22 and MPZ are expressed in tight or tight-like junctions of the apical domain of epithelial cells [ — ]. In this context, another important question is how polarity complexes interact to cross-regulate the trafficking machinery. Cell polarity in eggs and epithelia: parallels and diversity.
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