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• W2437097957 abstract "By conventional electron microscopy we observed in mitotic HeLa cells the structures termed Golgi clusters by Lucocq et al. (J. Cell Biol. 104, 865-874 (1987)) and interpreted by them as clusters of vesicular remnants of the Golgi apparatus. Golgi clusters consist of tubular and vesicular profiles about 50 nm in diameter, sometimes associated with larger 250 nm vesicles. When cultures of HeLa cells were incubated for 60 min or 120 min with medium containing high specific activity horseradish peroxidase (HRP) at 10 mg/ml we found that the membrane-bound compartments in the Golgi clusters in mitotic cells contained heavy deposits of HRP reaction product. Neither interphase nor mitotic HeLa cells contain an endogenous peroxidase activity. We concluded that Golgi clusters are an endocytic compartment and confirmed this by showing that Golgi clusters could be labeled with two other endocytic tracers--bovine serum albumin conjugated to colloidal gold and transferrin conjugated to HRP. When cultures were incubated with HRP for only 15 min most of the Golgi clusters in the mitotic cells were either unlabeled or consisted of a mixture of HRP-labeled and unlabeled profiles. Since during mitosis endocytosis is inhibited this was the expected result. When interphase HeLa cells were incubated with Brefeldin A (BFA), the Golgi apparatus disassembled and immunofluorescence microscopy showed that 1,4 beta galactosyltransferase had relocated to the endoplasmic reticulum. When cells in the presence of BFA and lacking the Golgi apparatus were allowed to endocytose HRP and then entered mitosis, typical HRP-labeled Golgi clusters were seen in the mitotic cells. It is therefore highly unlikely that these structures contain membrane derived from the Golgi cisternae that are sensitive to BFA, including in HeLa cells those containing galactosyltransferase. Finally, we found that interphase HeLa cells incubated with okadaic acid contain structures that are morphologically indistinguishable from Golgi clusters but can be labeled by endocytic tracer. Taken together, this evidence indicates that most, if not all, of the membrane-bound compartments in Golgi clusters are tubular early endosomes." @default.
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• W2437097957 date "1992-08-01" @default.
• W2437097957 modified "2023-09-23" @default.
• W2437097957 title "Evidence that globular Golgi clusters in mitotic HeLa cells are clustered tubular endosomes." @default.
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