Membrane lipid heterogeneity associated with acetylcholine receptor particle aggregates in Xenopus embryonic muscle cells

P. C. Bridgman, Y. Nakajima

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

Filipin, digitonin, and saponin react with membrane cholesterol to produce unique membrane alterations (sterolspecific complexes) that are easily discernible in freeze-fracture replicas. We have treated both noninnervated and innervated Xenopus embryonic muscle cells in culture with these agents. Freeze-fracture of these treated muscle cells showed that most areas of the muscle plasma membrane contain sterol-specific complexes (19-to 40-nm protuberances and dimples with filipin, a scalloped appearance with digitonin, or an irregular, rough appearance with saponin). However, these complexes were virtually absent from membrane areas of junctional and nonjunctional aggregates of acetylcholine receptor particles. This result suggests that the membrane matrix of these aggregates is low in cholesterol and that this membrane lipid heterogeneity may be linked to the mechanisms involved in their formation and stabilization on muscle cells in culture.

Original languageEnglish
Pages (from-to)1278-1282
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume78
Issue number2 II
StatePublished - Jan 1 1981
Externally publishedYes

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