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- W2100062463 abstract "Oxysterols play a significant role in cholesterol homeostasis. 25‐Hydroxycholesterol (25HC) in particular has been demonstrated to regulate cholesterol homeostasis via oxysterol‐binding protein and oxysterol‐related proteins, the sterol regulatory element binding protein, and the rate‐limiting enzyme of cholesterol biosynthesis, hydroxymethylglutaryl coenzyme A reductase. We have examined the effect of 25HC on pigmentation of cultured murine melanocytes and demonstrated a decrease in pigmentation with an IC 50 of 0.34 μ M and a significant diminution in levels of melanogenic protein tyrosinase. Pulse‐chase studies of 25HC‐treated cells demonstrated enhanced degradation of tyrosinase, the rate‐limiting enzyme of melanin synthesis, following endoplasmic reticulum (ER) and Golgi maturation. Protein levels of GS28, a member of an ER/ cis ‐Golgi SNARE protein complex, were also diminished in 25HC‐treated melanocytes, however levels of the ER chaperone calnexin and the cis ‐Golgi matrix protein GM130 were unaffected. Effects of 25HC on tyrosinase were completely reversed by 4α‐allylcholestan‐3α‐ol, a sterol identified by its ability to reverse effects of 25HC on cholesterol homeostasis. Finally, the addition of 25HC to lipid deficient serum inhibited correct processing of tyrosinase. We conclude that 25HC acts in the Golgi compartment to regulate pigmentation by a mechanism shared with cholesterol homeostasis." @default.
- W2100062463 created "2016-06-24" @default.
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- W2100062463 date "2004-07-12" @default.
- W2100062463 modified "2023-10-16" @default.
- W2100062463 title "25‐Hydroxycholesterol Acts in the Golgi Compartment to Induce Degradation of Tyrosinase" @default.
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- W2100062463 doi "https://doi.org/10.1111/j.1600-0749.2004.00161.x" @default.
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