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- W183727346 abstract "In rat ovary luteal cells, degradation of high density lipoprotein (HDL) to tricholoracetic acid (TCA)-soluble products accounts for only a fraction of the HDL-derived cholesterol used for steroidogenesis. In this study the authors have investigated the fate of /sup 125/I)HDL bound to cultured luteal cells using pulse-chase technique. Luteal cell cultures were pulse labeled with (/sup 125/I)HDL/sub 3/ and reincubated in the absence of HDL. By 24 h about 50% of the initallay bound radioactivity was released into the medium, of which 60-65% could be precipitated with 10% TCA. Gel filtration of the chase incubation medium on 10% agarose showed that the amount of TCA-soluble radioactivity was nearly completely accounted for by a sharp peak in the low molecular weight region which was identified as 96% monoiodotyrosine by paper chromatography. The TCA-precipitable radioactivity was nearly completely accounted for by a sharp peak in the low molecular weight region which was identified as 96% monoiodotyrosine by paper chromatography. The TCA-precipitable radioactivity eluted over a wide range of molecular weights (15,000-80,000), and there was very little intact HDL present. Electrophoresis of the chase medium showed that component of the TCA-precipitable portion had mobility similar to apo AI. Lysosomal inhibitors of receptor-mediated endocytosismore » had no effect on the composition or quantity of radioactivity released during chase incubation. The results show that HDL/sub 3/ binding to luteal cells is followed by complete degradation of the lipoprotein, although the TCA-soluble part does not reflect the extent of degradation.« less" @default.
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- W183727346 date "1986-03-01" @default.
- W183727346 modified "2023-09-24" @default.
- W183727346 title "Degradation of high density lipoprotein in cultured rat luteal cells" @default.
- W183727346 hasPublicationYear "1986" @default.
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