Calcium affinity for biliary lipid aggregates in model biles: complementary importance of bile salts and lecithin.

Abstract:

BACKGROUND/AIMS:Despite putative roles of calcium in biliary physiology and gallstone formation, quantitative aspects of calcium binding to bile salt (BS) monomers, simple micelles, mixed micelles, and vesicles, which constitute the lipid aggregates in bile, remain unexplored. METHODS:Calcium activity was measured using the calcium electrode in pathophysiologically relevant model biles composed of either individual BS species or a physiological mixture of glycine and taurine conjugates, as functions of lecithin and cholesterol contents and total lipid concentration. RESULTS:Calcium binding increased with increasing BS concentrations and lecithin contents and varied with species (dihydroxy > trihydroxy BS) and with conjugation (unconjugated > glycine conjugates > taurine conjugates). Although lecithin/cholesterol vesicles did not bind detectable calcium, when taurocholate was incorporated into membrane bilayers, calcium binding was substantially greater than with equimolar BS alone. Added cholesterol did not alter calcium binding, despite cholesterol saturation of biliary lipid aggregates and induction of liquid crystalline and solid crystalline-phase transitions. CONCLUSIONS:In model biles, most calcium is bound to mixed micelles, with minor contributions by BS monomers, simple micelles, and vesicles. It is proposed that BS-induced binding of calcium to vesicles and mixed micelles may be important in nucleation of cholesterol and bilirubinates from native bile.

journal_name

Gastroenterology

journal_title

Gastroenterology

authors

Donovan JM,Leonard MR,Batta AK,Carey MC

doi

10.1016/0016-5085(94)90134-1

subject

Has Abstract

pub_date

1994-09-01 00:00:00

pages

831-46

issue

3

eissn

0016-5085

issn

1528-0012

pii

S0016508594002787

journal_volume

107

pub_type

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