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- W2151304558 abstract "High doses of LY281389 (9-N-(n-propyl)-erythromycylamine) cause cytoplasmic vacuolar changes in striated and smooth muscle characteristic of drug-induced phospholipidosis. This study characterized phospholipidosis in striated and smooth muscle of rats and dogs, compared in vivo observations with those in a cultured rat myoblast model, and attempted to confirm the lysosomal origin of the drug-induced vacuoles. Standard transmission electron microscopy and acid phosphatase cytochemistry techniques were used to evaluate ultrastructural changes in vivo and in vitro. Rats and dogs exposed to LY281389 had a time- and dose-related increase in number and size of vacuoles containing concentric lamellar figures in cardiac and skeletal muscle. Cytochemical staining of dog stomach smooth muscle for acid phosphatase, a lysosomal enzyme, stained the periphery of vacuoles that contained concentric lamellar figures. Cultured rat L6 myoblast cells were exposed to 0.25 mg LY281389/ml for 2.5, 5, 10, 20, 30, or 90 min and 2, 6, 12, 24, or 48 hr. Cell cultures exposed for 2 hr had several predominantly large, clear, membrane-bound vacuoles, and at 6 and 12 hr there were greater numbers of large vacuoles that contained increased amounts of membranous figures. Following 24- or 48-hr exposures, vacuoles occupied most of the cytoplasmic volume, and were engorged predominantly with amorphous or granular material. These findings indicate that LY281389 can induce similar phospholipidosis-like vacuolar changes in rat and dog muscle and in a cultured rat muscle cell line. Further, positive acid phosphatase staining of drug-induced vacuolar structures, in conjunction with standard transmission electron microscopy techniques, strongly suggests that vacuoles seen in vitro and in vivo are lysosomal in origin." @default.
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- W2151304558 date "1996-08-01" @default.
- W2151304558 modified "2023-10-18" @default.
- W2151304558 title "In Vitroandin VivoUltrastructural Changes Induced by Macrolide Antibiotic LY281389" @default.
- W2151304558 doi "https://doi.org/10.1006/faat.1996.0123" @default.
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