Efecto de la ingesta de vitamina C en el proceso de formación de cálculos biliares de colesterol
| Autor: | Mirna Muñoz, Mafalda Maldonado, Reginald del Pozo, Andrés Dumas, Claudio Heine Tapia, Dieter Jüngst, Katia Muñoz, Felipe Fuentes |
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| Rok vydání: | 2014 |
| Předmět: |
medicine.medical_specialty
Vitamin C Cholesterol medicine.medical_treatment Gallbladder Phospholipid Lipid metabolism General Medicine Gallstones medicine.disease Ascorbic acid chemistry.chemical_compound Endocrinology medicine.anatomical_structure chemistry Internal medicine medicine lipids (amino acids peptides and proteins) Cholecystectomy Phospholipids |
| Zdroj: | Revista médica de Chile v.142 n.1 2014 SciELO Chile CONICYT Chile instacron:CONICYT |
| ISSN: | 0034-9887 |
| Popis: | Background: Biliary cholesterol is transported by vesicles and micelles. Cholesterol microcrystals are derived from thermodynamically unstable vesicles. In experimental animals vitamin C deficiency leads to a super-saturation of biliary cholesterol and to the formation of gallstones. Aim: To search for a possible relationship between serum levels of vitamin C and the formation of cholesterol gallstones in patients with cholelithiasis. Material and Methods: Thirteen patients with cholelithiasis and a programmed surgical intervention were treated with 2 g/day of vitamin C per os for two weeks before surgery. Forty nine patients subjected to a cholecystectomy not supplemented with vitamin C were studied as controls. Plasma concentrations of vitamin C and lipid profiles were measured. The cholesterol saturation index, crystallization time, cholesterol and phospholipid content in vesicles and micelles, separated by gel filtration chromatography, were studied in bile samples obtained from the gallbladder. Results: Vitamin C supplementation did not change significantly plasma lipids and bile lipid concentrations. However, in supplemented patients, significant reductions in vesicular cholesterol content (6.5 ± 4.8% compared to 17.9 ± 14.0% in the control group; p < 0.05) and vesicular cholesterol/phospholipid ratio (0.71 ± 0.53 compared to 1.36 ± 1.15 in controls; p < 0.05), were observed. Conclusions: Vitamin C administration may modify bile cholesterol crystallization process, the first step in cholesterol gallstone formation. |
| Databáze: | OpenAIRE |
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