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- W2024066734 abstract "Terminal differentiation of the keratinocytes (cornification) has been linked to a restricted supply of retinol. Retinol is distributed to target cells by the retinol-binding protein (RBP), which circulates in the plasma in complex with transthyretin (TTR). In this study we have addressed the question of retinol delivery to the epidermis via RBP. Retinol radiobinding assays, affinity chromatography with TTR coupled to Sepharose beads, polyacrylamide gel electrophoresis, and immunoblotting techniques were used to show that epidermal extracts contain retinol binding sites with no affinity for TTR. Immunoreactive RBP was detected in the epidermal extracts. The RBP in the epidermis was in the apoform (without retinol) in contrast to serum where the majority of RBP is in the holoform (with retinol). Epidermal RBP was converted in vitro into the holoform only after addition of 20 times more retinol, which was needed to reconstitute holoforms of RBP in dermal extracts, human buccal mucosal extracts, and delipidized normal serum or purified delipidized RBP. Moreover, several immunoreactive RBP bands (possibly degradation products) were identified in the epidermal but not in dermal extracts. Retinol-binding protein from nonkeratinizing human oral mucosa showed different immunoblotting patterns when compared to epidermal RBP. These results suggest that degradation of RBP within the epidermis may result in a decreased retinol supply to the keratinocytes, and may lead to the cornification of the epidermis." @default.
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- W2024066734 date "1987-04-01" @default.
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- W2024066734 title "Loss of Retinol-Binding Properties for Plasma Retinol-Binding Protein in Normal Human Epidermis" @default.
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- W2024066734 doi "https://doi.org/10.1111/1523-1747.ep12469731" @default.
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