| Autor: |
A K Groen, R Ottenhoff, P L Jansen, J van Marle, G N Tytgat |
| Jazyk: |
angličtina |
| Rok vydání: |
1989 |
| Předmět: |
|
| Zdroj: |
Journal of Lipid Research, Vol 30, Iss 1, Pp 51-58 (1989) |
| Druh dokumentu: |
article |
| ISSN: |
0022-2275 |
| DOI: |
10.1016/S0022-2275(20)38397-8 |
| Popis: |
Human bile contains a factor with cholesterol nucleation-promoting activity that binds to concanavalin A-Sepharose. In this study we have investigated the effect of this activity on the dynamics of lipid solubilization in supersaturated model bile. A concanavalin A binding protein fraction of human bile was mixed with model bile and the effect on the distribution of cholesterol and phospholipid between mixed micelles and phospholipid/cholesterol vesicles was studied by means of density gradient ultracentrifugation. The nucleation-promoting activity containing fraction induced a transfer of cholesterol and phospholipid from the micellar to the vesicular phase. This led to a decrease in the density of the vesicular fraction. We have also studied the effect of promoting activity on the nucleation time of an isolated vesicle fraction. A decrease of the nucleation time of 10.7 +/- 1.3 to 2.3 +/- 0.3 days was observed. In conclusion, a concanavalin A binding protein fraction from human bile stimulated cholesterol nucleation via a double effect; it increased the amount of vesicular cholesterol and phospholipid, and it also directly induced nucleation of cholesterol from the vesicles. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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