PMID: 3755360Aug 7, 1986Paper

Bilirubin diffusion through lipid membranes

Biochimica Et Biophysica Acta
D HaywardM J Poznansky

Abstract

The possibility that bilirubin can diffuse through lipid bilayers is investigated with liposomes prepared from dipalmitoylphosphatidylcholine (DPPC), egg phosphatidylcholine (egg PC) with 22 mole percent cholesterol, and a lipid extract preparation from N115 neuroblastoma cells. Liposomes were prepared with internalized bilirubin and bovine or human serum albumin, and bilirubin efflux into an exogenous solution of human serum albumin was measured. Efflux from DPPC liposomes was significantly higher above the phase transition temperature than below it. This change was dependent on the lipid undergoing a phase transition and could not be accounted for by 6 K change in temperature. Maximum bilirubin efflux from egg PC-cholesterol liposomes was found to depend on the relative internal and external albumin pools, suggesting an equilibrium distribution of bilirubin between them. These observations demonstrate that bilirubin can diffuse freely through these lipid membranes.

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Citations

Jan 1, 1988·Comparative Biochemistry and Physiology. A, Comparative Physiology·B K Makos, J H Youson
Sep 5, 2002·Seminars in Neonatology : SN·Thor Willy Ruud Hansen
May 15, 1988·Archives of Biochemistry and Biophysics·F Vanstapel, N Blanckaert
Sep 24, 2004·International Journal of Cancer. Journal International Du Cancer·Pavitra KeshavanStephen D Zucker
Mar 8, 2005·The Journal of Immunology : Official Journal of the American Association of Immunologists·Pavitra KeshavanStephen D Zucker
Sep 1, 2005·Molecular and Cellular Biochemistry·Huma RashidSaad Tayyab
Feb 17, 2000·Biochimica Et Biophysica Acta·S D Zucker, W Goessling

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