Add time:07/17/2019 Source:sciencedirect.com
Filipin, a sterol-specific polyene antibiotic, has been shown by electron microscopy to form complexes in membranes of mouse urinary bladder cells. Following instillation of a glutaraldehyde-filipin-dimethylsulfoxide solution into the bladder lumen, filipin-cholesterol complexes appear as membrane corrugations in thin sections and as 20–25 nm protuberances and depressions on PF and EF faces in freeze-fracture replicas. The complexes are observed in plasmalemma, Golgi membrane, rough endoplasmic reticulum and nuclear membrane of five different cell types (urothelial, endothelial, mesothelial, smooth muscle and fibroblasts). In the present report, we direct particular attention to the localization of numerous filipin-cholesterol complexes present in the nuclear envelopes of these cells. Our results suggest that enrichment of cell membranes with cholesterol occurs at an earlier stage in the flow-differentiation process than previously suspected. In addition, the unequal distribution of complexes in favor of the outer nuclear membrane suggests that it has a higher cholesterol content than the inner membrane.
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