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Wang HH, Li X, Patel SB, Wang DQH. Evidence that the adenosine triphosphate-binding cassette G5/G8-independent pathway plays a determinant role in cholesterol gallstone formation in mice. Hepatology 2016; 64:853-64. [PMID: 27014967 PMCID: PMC6037420 DOI: 10.1002/hep.28570] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Accepted: 03/19/2016] [Indexed: 12/18/2022]
Abstract
UNLABELLED The adenosine triphosphate-binding cassette (ABC) sterol transporter, Abcg5/g8, is Lith9 in mice, and two gallstone-associated variants in ABCG5/G8 have been identified in humans. Although ABCG5/G8 plays a critical role in determining hepatic sterol secretion, cholesterol is still secreted to bile in sitosterolemic patients with a defect in either ABCG5 or ABCG8 and in either Abcg5/g8 double- or single-knockout mice. We hypothesize that in the defect of ABCG5/G8, an ABCG5/G8-independent pathway is essential for regulating hepatic secretion of biliary sterols, which is independent of the lithogenic mechanism of the ABCG5/G8 pathway. To elucidate the effect of the ABCG5/G8-independent pathway on cholelithogenesis, we investigated the biliary and gallstone characteristics in male wild-type (WT), ABCG5(-/-)/G8(-/-), and ABCG8 (-/-) mice fed a lithogenic diet or varying amounts of cholesterol, treated with a liver X receptor (LXR) agonist, or injected intravenously with [(3) H]sitostanol- and [(14) C]cholesterol-labeled high-density lipoprotein (HDL). We found that ABCG5(-/-)/G8(-/-) and ABCG8 (-/-) mice displayed the same biliary and gallstone phenotypes. Although both groups of knockout mice showed a significant reduction in hepatic cholesterol output compared to WT mice, they still formed gallstones. The LXR agonist significantly increased biliary cholesterol secretion and gallstones in WT, but not ABCG5(-/-)/G8(-/-) or ABCG8 (-/-), mice. The 6-hour recovery of [(14) C]cholesterol in hepatic bile was significantly lower in both groups of knockout mice than in WT mice and [(3) H]sitostanol was detected in WT, but not ABCG5(-/-)/G8(-/-) or ABCG8 (-/-), mice. CONCLUSIONS The ABCG5/G8-independent pathway plays an important role in regulating biliary cholesterol secretion, the transport of HDL-derived cholesterol from plasma to bile, and gallstone formation, which works independently of the ABCG5/G8 pathway. Further studies are needed to observe whether this pathway is also operational in humans. (Hepatology 2016;64:853-864).
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Affiliation(s)
- Helen H. Wang
- Department of Medicine, Liver Center and Gastroenterology Division, Beth Israel Deaconess Medical Center, Harvard Medical School and Harvard Digestive Diseases Center, Boston, MA,Department of Internal Medicine, Division of Gastroenterology and Hepatology, Saint Louis University School of Medicine, St. Louis, MO
| | - Xiaodan Li
- Department of Internal Medicine, Division of Gastroenterology and Hepatology, Saint Louis University School of Medicine, St. Louis, MO
| | - Shailendra B. Patel
- Division of Endocrinology, Metabolism and Clinical Nutrition, Medical College of Wisconsin, Milwaukee, WI
| | - David Q.-H. Wang
- Department of Medicine, Liver Center and Gastroenterology Division, Beth Israel Deaconess Medical Center, Harvard Medical School and Harvard Digestive Diseases Center, Boston, MA,Department of Internal Medicine, Division of Gastroenterology and Hepatology, Saint Louis University School of Medicine, St. Louis, MO,Correspondence to David Q.-H. Wang, M.D., Ph.D., at his present address: Department of Internal Medicine, Division of Gastroenterology and Hepatology, Saint Louis University School of Medicine, St. Louis, MO 63104, USA. Phone: (314) 977-8737, Fax: (314) 977-9909,
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Roots and Tuber Crops as Functional Foods: A Review on Phytochemical Constituents and Their Potential Health Benefits. INTERNATIONAL JOURNAL OF FOOD SCIENCE 2016; 2016:3631647. [PMID: 27127779 PMCID: PMC4834168 DOI: 10.1155/2016/3631647] [Citation(s) in RCA: 97] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 02/07/2016] [Accepted: 03/14/2016] [Indexed: 11/25/2022]
Abstract
Starchy roots and tuber crops play a pivotal role in the human diet. There are number of roots and tubers which make an extensive biodiversity even within the same geographical location. Thus, they add variety to the diet in addition to offering numerous desirable nutritional and health benefits such as antioxidative, hypoglycemic, hypocholesterolemic, antimicrobial, and immunomodulatory activities. A number of bioactive constituents such as phenolic compounds, saponins, bioactive proteins, glycoalkaloids, and phytic acids are responsible for the observed effects. Many starchy tuber crops, except the common potatoes, sweet potatoes, and cassava, are not yet fully explored for their nutritional and health benefits. In Asian countries, some edible tubers are also used as traditional medicinal. A variety of foods can be prepared using tubers and they may also be used in industrial applications. Processing may affect the bioactivities of constituent compounds. Tubers have an immense potential as functional foods and nutraceutical ingredients to be explored in disease risk reduction and wellness.
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Patel K, Gadewar M, Tahilyani V, Patel DK. A review on pharmacological and analytical aspects of diosgenin: a concise report. NATURAL PRODUCTS AND BIOPROSPECTING 2012; 2. [PMCID: PMC4131590 DOI: 10.1007/s13659-012-0014-3] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Diosgenin is a steroidal sapogenin found in plants such as Dioscorea nipponoca, Solanum incanum, Solanum xanthocarpum and Trigonella foenum graecum. Diosgenin, biologically active phytochemicals have been used for the treatment of various types of disorder such as leukemia, inflammation, hypercholesterolemia and cancer. It is also able to prevent bone loss to the same extent as that of oestrogen. It is a typical initial intermediate for synthesis of steroidal compounds, oral contraceptives and sex hormones. Dioscorea, Costus and Trigonella are mainly used for the production of diosgenin. On the basis of literature survey it divulges that diosgenin has very impressive pharmacological profile and could be used as a medicine for the treatment of different types of disorders in the future. Thus, the present work aims to provide collective information in concern with its pharmacological activity and phytoanalytical techniques. This review will be beneficial to researches for the development of an alternative method for the treatment of innumerable diseases from diosgenin. ![]()
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Affiliation(s)
- Kanika Patel
- />G.L.A Institute of Pharmaceutical Research, Mathura, India
| | | | | | - Dinesh Kumar Patel
- />Department of Pharmaceutics, Institute of Technology, Banaras Hindu University, Varanasi, 221005 India
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Wang L, Wang X, Yuan X, Zhao B. Simultaneous analysis of diosgenin and sarsasapogenin in Asparagus officinalis byproduct by thin-layer chromatography. PHYTOCHEMICAL ANALYSIS : PCA 2011; 22:14-7. [PMID: 20799270 DOI: 10.1002/pca.1244] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2010] [Revised: 06/09/2010] [Accepted: 06/12/2010] [Indexed: 05/07/2023]
Abstract
INTRODUCTION Asparagus officinalis L. has several biological activities including antifungal, antiviral and antitumoral activities due to the steroidal saponins. Normally diosgenin and sarsasapogenin are analysed separately by thin-layer chromatography or high-performance liquid chromatography (HPLC-UV or HPLC-ELSD), which is time-consuming and expensive, so we need to find a rapid solution to this problem. OBJECTIVE To develop a sensitive, rapid and validated TLC method for simultaneous detection and quantification of diosgenin and sarsasapogenin. METHODOLOGY Samples were prepared by extraction of A. officinalis with 70% aqueous ethanol to get steroidal saponins, and then hydrolysed using 36 mL 2 m hydrochloric acid for 3 h. The hydrolysis product was extracted with chloroform, and then analysed by TLC, the results of which were verified by HPLC and HPLC-MS. RESULTS The retention factor (R(f)) of diosgenin and sarsasapogenin on TLC plate were 0.49 and 0.6, respectively. After calculation from the regression equation of the standard curve, the contents of diosgenin and sarsasapogenin in the A. officinalis extract were 0.27-0.46 and 0.11-0.32%, respectively. CONCLUSION The study showed that thin-layer chromatography can be applied for the determination of diosgenin and sarsasapogenin in the oldest tissue of A. officinalis, and also can be conducted for screening of sapogenin in other plant or extracts.
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Affiliation(s)
- Liwei Wang
- National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, 100190, Beijing, People's Republic of China
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Campos-Vega R, Loarca-Piña G, Oomah BD. Minor components of pulses and their potential impact on human health. Food Res Int 2010. [DOI: 10.1016/j.foodres.2009.09.004] [Citation(s) in RCA: 173] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Shujun W, Jinglin Y, Hongyan L, Weiping C. Characterisation and preliminary lipid-lowering evaluation of starch from Chinese yam. Food Chem 2008. [DOI: 10.1016/j.foodchem.2007.10.059] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Rochfort S, Panozzo J. Phytochemicals for health, the role of pulses. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2007; 55:7981-94. [PMID: 17784726 DOI: 10.1021/jf071704w] [Citation(s) in RCA: 165] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Pulses are the seeds of legumes that are used for human consumption and include peas, beans, lentils, chickpeas, and fava beans. Pulses are an important source of macronutrients, containing almost twice the amount of protein compared to cereal grains. In addition to being a source of macronutrients and minerals, pulses also contain plant secondary metabolites that are increasingly being recognised for their potential benefits for human health. The best-studied legume is the soybean, traditionally regarded as an oilseed crop rather than a pulse. The potential health benefits of soy, particularly with respect to isoflavone content, have been the subject of much research and the focus of several reviews. By comparison, less is known about pulses. This review investigates the health potential of pulses, examining the bioactivity of pulse isoflavones, phytosterols, resistant starch, bioactive carbohydrates, alkaloids and saponins. The evidence for health properties is considered, as is the effect of processing and cooking on these potentially beneficial phytochemicals.
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Affiliation(s)
- Simone Rochfort
- Department of Primary Industries, Werribee Centre, Werribee, Victoria, Australia.
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Chen HL, Wang CH, Chang CT, Wang TC. Effects of Taiwanese yam (Dioscorea japonica Thunb var. pseudojaponica Yamamoto) on upper gut function and lipid metabolism in Balb/c mice. Nutrition 2003; 19:646-51. [PMID: 12831952 DOI: 10.1016/s0899-9007(03)00058-3] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
OBJECTIVE This study investigated the effects of a Taiwanese yam, Dioscorea japonica Thunb var. pseudojaponica Yamamoto, on upper gut function and lipid metabolism in adult Balb/c mice. METHODS Mice were randomly allocated to consume the control, 25%, or 50% yam diet in which yam in an uncooked lyophilized form was incorporated into the diet for 21 d. RESULTS Growth rates were similar among groups, even though the apparent protein absorption rate was decreased by the 50% yam diet. Both yam diets decreased gastric villous width but did not significantly modulate other morphologic and proliferative indices. Brush-border leucine aminopeptidase activities in the small intestine were increased approximately 30% by the 25% and 50% yam diets, respectively. In contrast, sucrase activity was decreased 40% by the 25% yam diet and 50% by the 50% yam diet. The 50% yam diet consistently improved the cholesterol profile in the plasma and liver, whereas the 25% yam diet reduced only the level of low-density lipoprotein cholesterol in plasma. Changes in blood lipid levels were associated with reduced fat absorption. CONCLUSION A 25% uncooked yam diet may benefit upper gut function and prevent hypercholesterolemia in humans, but the 50% yam diet negatively affected protein absorption.
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Affiliation(s)
- Hsiao- Ling Chen
- Institute of Nutritional Science, School of Nutrition, Chung Shan Medical University, Taichung, Taiwan, People's Republic of China.
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Kosters A, Frijters RJJM, Schaap FG, Vink E, Plösch T, Ottenhoff R, Jirsa M, De Cuyper IM, Kuipers F, Groen AK. Relation between hepatic expression of ATP-binding cassette transporters G5 and G8 and biliary cholesterol secretion in mice. J Hepatol 2003; 38:710-6. [PMID: 12763362 DOI: 10.1016/s0168-8278(03)00093-x] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
BACKGROUND/AIM Mutations in genes encoding the ATP-binding cassette (ABC)-transporters ABCG5 and ABCG8 underlie sitosterolemia, which is characterized by elevated plasma levels of phytosterols due to increased intestinal absorption and impaired biliary secretion of sterols. The aim of our study was to correlate the expression levels of Abcg5 and Abcg8 to biliary cholesterol secretion in various (genetically-modified) mouse models. METHODS Bile was collected from genetically-modified mice fed a chow diet, or from mice fed either a chow diet, or chow supplemented with either 1% diosgenin, 0.1% simvastatin, or a synthetic liver X receptor agonist, for determination of biliary lipids. Livers and small intestines were harvested and expression levels of Abcg5, Abcg8 and Abcb4 were determined by real-time polymerase chain reaction. RESULTS Intestinal expression of Abcg5 and Abcg8 did not show much variation between the various models. In contrast, a linear correlation between hepatic expression levels of Abcg5 and Abcg8 and biliary cholesterol secretion rates was found. This relation was independent of Abcb4-mediated phospholipid secretion. However, in diosgenin-fed mice showing cholesterol hypersecretion, hepatic Abcg5 and Abcg8 expression levels remained unchanged. CONCLUSIONS Our results strongly support a role for Abcg5 and Abcg8 in regulation of biliary cholesterol secretion, but also indicate the existence of a largely independent route of cholesterol secretion.
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Affiliation(s)
- Astrid Kosters
- Department of Experimental Hepatology, AMC Liver Center, Academic Medical Center, Meibergdreef 69-71, Amsterdam 1105 BK, The Netherlands.
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Effects of Taiwanese yam (Dioscorea alata L. cv. Tainung No. 2) on the mucosal hydrolase activities and lipid metabolism in Balb/c mice. Nutr Res 2003. [DOI: 10.1016/s0271-5317(03)00036-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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12
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Kosters A, Jirsa M, Groen AK. Genetic background of cholesterol gallstone disease. BIOCHIMICA ET BIOPHYSICA ACTA 2003; 1637:1-19. [PMID: 12527402 DOI: 10.1016/s0925-4439(02)00173-4] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Cholesterol gallstone formation is a multifactorial process involving a multitude of metabolic pathways. The primary pathogenic factor is hypersecretion of free cholesterol into bile. For people living in the Western Hemisphere, this is almost a normal condition, certainly in the elderly, which explains the very high incidence of gallstone disease. It is probably because the multifactorial background genes responsible for the high incidence have not yet been identified, despite the fact that genetic factors clearly play a role. Analysis of the many pathways involved in biliary cholesterol secretion reveals many potential candidates and considering the progress in unraveling the regulatory mechanisms of the responsible genes, identification of the primary gallstone genes will be successful in the near future.
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Affiliation(s)
- Astrid Kosters
- Department of Experimental Hepatology, AMC Liver Center S1-172, Academic Medical Center, Meibergdreef 69-71, 1105 BK, Amsterdam, The Netherlands.
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Oncina R, Del Rı́o J, Gómez P, Ortuño A. Effect of ethylene on diosgenin accumulation in callus cultures of Trigonella foenum-graecum L. Food Chem 2002. [DOI: 10.1016/s0308-8146(01)00309-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Nibbering CP, Groen AK, Ottenhoff R, Brouwers JF, vanBerge-Henegouwen GP, van Erpecum KJ. Regulation of biliary cholesterol secretion is independent of hepatocyte canalicular membrane lipid composition: a study in the diosgenin-fed rat model. J Hepatol 2001; 35:164-9. [PMID: 11580137 DOI: 10.1016/s0168-8278(01)00125-8] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
BACKGROUND/AIMS Phosphatidylcholine (PC) and sphingomyelin (SM) are the major phospholipids on the outer leaflet of the hepatocyte canalicular membrane. Since cholesterol preferentially associates with SM in detergent-resistant microdomains, we hypothesized that canalicular membrane lipid composition could modulate secretion of the sterol into bile. METHODS Male Wistar rats were fed for 10 days with a control diet with or without the plant sterol diosgenin (1% w/w) to induce biliary cholesterol hypersecretion. Thereafter, lipid compositions and phospholipid molecular species were determined in fistula bile and highly enriched canalicular membrane fractions. RESULTS Despite four-fold higher biliary cholesterol output in diosgenin-fed rats, no differences were observed between canalicular membranes of diosgenin and control groups with respect to cholesterol/phospholipid ratios (0.58 vs 0.62), phospholipid classes and acyl chain compositions of SMs (16:0 > 24:1 > 24:0 > 22:0 > 18:0 > 23:0 > 20:0 > 24:2), or PCs (mainly diacyl 16:0-18:2, 16:0-20:4, 18:0-20:4, and 18:0-18:2). In contrast to canalicular PCs, bile contained more hydrophilic species (mainly diacyl 16:0-18:2 and 16:0-20:4), without differences between both groups. In vitro resistance of purified canalicular membrane fractions against detergents such as Triton X-100 and taurocholate was also similar in both groups. CONCLUSIONS Diosgenin-induced biliary cholesterol hypersecretion occurs in the absence of changes of canalicular membrane lipids. Our data therefore do not support a major role of canalicular membrane lipid composition in regulation of biliary cholesterol secretion.
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Affiliation(s)
- C P Nibbering
- Department of Gastroenterology, Gastrointestinal Research Unit, University Medical Center Utrecht, The Netherlands
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Accatino L, Pizarro M, Solís N, Koenig CS. Effects of diosgenin, a plant-derived steroid, on bile secretion and hepatocellular cholestasis induced by estrogens in the rat. Hepatology 1998; 28:129-40. [PMID: 9657105 DOI: 10.1002/hep.510280118] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Increased biliary secretion of cholesterol and lipid vesicles (unilamellae and multilamellae) induced by diosgenin (D), a plant-derived steroid, has cytoprotective effects in the rat liver subjected to obstructive cholestasis. In this study, our aims were to investigate the following: 1) the effects of D on the bile secretory process and on the cholestasis induced by estradiol-17beta-(beta-D-glucuronide) (E17G) or 17 alpha-ethynylestradiol (E) administration; 2) whether the potentially protective effects of D are related to D-induced increase of biliary cholesterol and lipid lamellae; and 3) whether D has other effects capable of modifying specific bile secretory processes or preventing the cholestatic effects of estrogens. Rats were fed a standard ground chow (control group) or chow containing D for 6 days. E17G was administered i.v. to control and D-fed rats and bile flow, bile salt output, and alkaline phosphatase excretion were examined. 17alpha-E was administered from days 4 to 6 to rats fed standard chow or chow plus D for 6 days and different functional parameters of the bile secretory process as well as the ultrastructure of hepatocytes and histochemistry of alkaline phosphatase and Mg2+-adenosine triphosphatase (ATPase) were examined. D-treatment markedly increased cholesterol and lamellar structures in bile and attenuated the acute cholestatic effects of E17G. D-feeding prevented the decrease of taurocholate maximum secretory rate and the increase of biliary alkaline phosphatase and Ca2+,Mg2+-EctoATPase (EctoATPase) excretion, as well as the increase of cholesterol/ phospholipids ratio, alkaline phosphatase activity, and EctoATPase content in canalicular plasma membranes induced by E. D-feeding did not prevent E-induced decrease of basal bile flow, bile salt, cholesterol, and phospholipid secretory rates nor the decrease of Na+,K+-ATPase activity and Na+-taurocholate cotransporting polypeptide (Ntcp) content in isolated sinusoidal membranes. Cholestatic alterations of canalicular domain were apparent in E-treated rats. D administration was also associated with changes of ultrastructure and histochemistry of hepatocytes. E-induced alterations in ultrastructure and acinar distribution and intensity of histochemical reaction of both enzymes were partially prevented by D-feeding. We conclude that D administration, in addition to inducing a marked increase of biliary cholesterol and lipid lamellar structures output, was associated to changes in hepatocyte morphology and plasma membrane composition, enzymes activity, and histochemistry. D-feeding attenuated the acute cholestatic effects of E17G. D-induced increase of bile cholesterol and lipid lamellae content was not apparent when D-fed rats received E. Despite this fact, D administration prevented some cholestatic effects of E, probably through different metabolic effects and/or direct membrane effects, not related to increased lipid lamellae excretion.
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Affiliation(s)
- L Accatino
- Department of Gastroenterology, School of Medicine, Pontificia Universidad Católica de Chile, Santiago de Chile
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Duane WC. Effects of legume consumption on serum cholesterol, biliary lipids, and sterol metabolism in humans. J Lipid Res 1997. [DOI: 10.1016/s0022-2275(20)37194-7] [Citation(s) in RCA: 68] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
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Kuipers F, Oude Elferink RP, Verkade HJ, Groen AK. Mechanisms and (patho)physiological significance of biliary cholesterol secretion. Subcell Biochem 1997; 28:295-318. [PMID: 9090299 DOI: 10.1007/978-1-4615-5901-6_11] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- F Kuipers
- Groningen Institute for Drug Studies, Laboratory of Nutrition and Metabolism, Academic Hospital Groningen, The Netherlands
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Gilat T, Sömjen GJ. Phospholipid vesicles and other cholesterol carriers in bile. BIOCHIMICA ET BIOPHYSICA ACTA 1996; 1286:95-115. [PMID: 8652613 DOI: 10.1016/0304-4157(96)00005-6] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- T Gilat
- Department of Gastroenterology, Tel-Aviv Souaaski Medical Center, Ichilov Hospital, Tel-Aviv, Israel
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Roman ID, Thewles A, Coleman R. Fractionation of livers following diosgenin treatment to elevate biliary cholesterol. BIOCHIMICA ET BIOPHYSICA ACTA 1995; 1255:77-81. [PMID: 7893741 DOI: 10.1016/0005-2760(94)00212-h] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The plant saponin, diosgenin, is known to induce a marked increase in biliary cholesterol/phospholipid ratio. We reasoned that putative biliary lipid supply vesicles might be similarly enriched with cholesterol. Seven-day diosgenin feeding to rats resulted in significantly increased biliary cholesterol and cholesterol/phospholipid ratio, but had no effect on total cholesterol or phospholipid content of the liver. Subcellular fractionation of livers showed no selective increase in any fraction (nuclear, mitochondrial, lysosomal, microsomal) of the homogenate. Further subfractionation of microsomal or nuclear (plasma membrane) fractions also showed no difference between control and diosgenin groups. Thus, no intracellular vesicle fraction has been identified with the provision of the enhanced biliary cholesterol and the results are discussed in terms of the possible involvement of cytosolic lipid-binding proteins as putative lipid carriers to the canalicular membrane as an alternative to the presence of the lipid in lipid supply vesicles.
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Affiliation(s)
- I D Roman
- School of Biochemistry, University of Birmingham, Edgbaston, UK
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Puglielli L, Amigo L, Arrese M, Núñez L, Rigotti A, Garrido J, González S, Mingrone G, Greco AV, Accatino L. Protective role of biliary cholesterol and phospholipid lamellae against bile acid-induced cell damage. Gastroenterology 1994; 107:244-54. [PMID: 8020668 DOI: 10.1016/0016-5085(94)90083-3] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
BACKGROUND/AIMS Bile salts (BS) are cytotoxic agents, but cell damage is not observed in the hepatobiliary system. We hypothesized that biliary lipid vesicles (unilamellae and multilamellae) could have a protective role against BS-induced cytotoxicity. METHODS Biliary lipid lamellar secretion was induced by feeding rats with 0.5% diosgenin. Cytoprotection was assessed in bile duct-obstructed rats and by incubating human erythrocytes with sodium taurocholate. RESULTS Biliary cholesterol concentration increased > 300% in diosgenin-fed rats; electron microscopic examination showed a great abundance of lipid lamellar vesicles in bile and within the canaliculi. After bile duct obstruction, serum hepatic enzyme activities were significantly lower in diosgenin-fed rats. Histologically severe and confluent hepatocellular necrosis was only observed in control rats. Biliary lamellar lipid material significantly reduced the BS-induced hemolytic effect in vitro in a concentration-dependent manner. This protective effect correlated to a progressive decrease in the intermicellar BS concentration. Phosphatidylcholine or cholesterol, alone or as lamellar structures, also showed cytoprotective effect in vitro but always less than native biliary lamellae. CONCLUSIONS These results support the concept that native biliary cholesterol phospholipid lamellae represent an important cytoprotective factor for hepatocytes and biliary epithelial cells against BS-induced damage.
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Affiliation(s)
- L Puglielli
- Departamento de Gastroenterología, Pontificia Universidad Católica, Santiago, Chile
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