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Alignment of cholesterol in the membrane bilayer

L Luciano, E Reale, H Konitz, U Boseck and S Boseck

Laboratory of Cell Biology and Electron Microscopy, Hannover Medical School, Federal Republic of Germany.

Freeze-fracture replicas of filipin-treated samples of guinea pig colon mucosa reveal areas in the membrane of the goblet cell granules labeled by filipin-cholesterol complexes (FCC) intermingled with regions patterned by "lines." The FCC and "lines" are arranged in an approximately rhombic pattern. Other membranes of the same cell or of other cells display either FCC only, aligned and occasionally ordered in "rhombs," "lines" only, with a similar pattern, or randomly distributed FCC. Optical diffraction was used to analyze and compare replicas of membranes with ordered FCC and "lines", as well as randomly distributed FCC. The results demonstrate that all these structures are reciprocally related through a common distribution pattern in the membrane. This observation supports the assumption that cholesterol has a preferential ordered distribution within the membrane bilayer.

Volume 37, Issue 9, pp. 1421-1425, 09/01/1989
Copyright © 1989 by The Histochemical Society


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The Journal of Histochemistry & Cytochemistry is owned, published, and licensed by The Histochemical Society © 1989