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- W2070858088 abstract "In addition to its extracellular function as a secreted protein, IGF‐binding protein (IGFBP)‐5 has been postulated to act as a signaling molecule in the nucleus. This study aims to assess the significance of this postulated nuclear localization. By confocal immunofluorescence microscopy, we detected IGFBP‐5 in the vesicular compartment of mammary epithelial cells in culture, while no nuclear staining was observed. Immunohistochemistry performed on paraffin sections of the involuting mammary gland revealed IGFBP‐5 positive staining of epithelial cells only outside the nucleus. To evaluate the contribution of reuptake of extracellular IGFBP‐5, T47D cells were incubated with Alexa Fluor 647‐labeled IGFBP‐5. The protein was taken up into intracellular vesicles and again was neither detectable in the cytoplasm outside of vesicular structures nor in the nucleus. Quantification of the time and concentration dependence of uptake by immunoblotting revealed that the process was saturable at IGFBP‐5 concentrations between 1 and 2 μ m and partially reversible with 30% remaining in the cell after a 1‐h chase. The observation of nuclear uptake of IGFBP‐5 was restricted to artificial conditions such as expression of non‐secreted forms of IGFBP‐5 or selective permeabilization of the plasma membrane by digitonin." @default.
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- W2070858088 date "2007-09-24" @default.
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- W2070858088 title "Insulin‐Like Growth Factor‐Binding Protein‐5 Enters Vesicular Structures but Not the Nucleus" @default.
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- W2070858088 doi "https://doi.org/10.1111/j.1600-0854.2007.00655.x" @default.
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