1
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Ridlon JM, Gaskins HR. Another renaissance for bile acid gastrointestinal microbiology. Nat Rev Gastroenterol Hepatol 2024; 21:348-364. [PMID: 38383804 DOI: 10.1038/s41575-024-00896-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 01/16/2024] [Indexed: 02/23/2024]
Abstract
The field of bile acid microbiology in the gastrointestinal tract is going through a current rebirth after a peak of activity in the late 1970s and early 1980s. This renewed activity is a result of many factors, including the discovery near the turn of the century that bile acids are potent signalling molecules and technological advances in next-generation sequencing, computation, culturomics, gnotobiology, and metabolomics. We describe the current state of the field with particular emphasis on questions that have remained unanswered for many decades in both bile acid synthesis by the host and metabolism by the gut microbiota. Current knowledge of established enzymatic pathways, including bile salt hydrolase, hydroxysteroid dehydrogenases involved in the oxidation and epimerization of bile acid hydroxy groups, the Hylemon-Bjӧrkhem pathway of bile acid C7-dehydroxylation, and the formation of secondary allo-bile acids, is described. We cover aspects of bile acid conjugation and esterification as well as evidence for bile acid C3-dehydroxylation and C12-dehydroxylation that are less well understood but potentially critical for our understanding of bile acid metabolism in the human gut. The physiological consequences of bile acid metabolism for human health, important caveats and cautionary notes on experimental design and interpretation of data reflecting bile acid metabolism are also explored.
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Affiliation(s)
- Jason M Ridlon
- Department of Animal Sciences, University of Illinois Urbana-Champaign, Urbana, IL, USA.
- Division of Nutritional Sciences, University of Illinois Urbana-Champaign, Urbana, IL, USA.
- Carl R. Woese Institute for Genomic Biology, University of Illinois Urbana-Champaign, Urbana, IL, USA.
- Cancer Center at Illinois, University of Illinois Urbana-Champaign, Urbana, IL, USA.
- Center for Advanced Study, University of Illinois Urbana-Champaign, Urbana, IL, USA.
- Department of Microbiology & Immunology, Virginia Commonwealth University, Richmond, VA, USA.
| | - H Rex Gaskins
- Department of Animal Sciences, University of Illinois Urbana-Champaign, Urbana, IL, USA.
- Division of Nutritional Sciences, University of Illinois Urbana-Champaign, Urbana, IL, USA.
- Carl R. Woese Institute for Genomic Biology, University of Illinois Urbana-Champaign, Urbana, IL, USA.
- Cancer Center at Illinois, University of Illinois Urbana-Champaign, Urbana, IL, USA.
- Department of Biomedical and Translational Sciences, University of Illinois Urbana-Champaign, Urbana, IL, USA.
- Department of Pathobiology, University of Illinois Urbana-Champaign, Urbana, IL, USA.
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2
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Buchinger TJ, Li K, Bussy U, Huerta B, Tamrakar S, Johnson NS, Li W. Male lake char release taurocholic acid as part of a mating pheromone. J Exp Biol 2024; 227:jeb246801. [PMID: 38270203 PMCID: PMC10906664 DOI: 10.1242/jeb.246801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Accepted: 12/13/2023] [Indexed: 01/26/2024]
Abstract
The evolutionary origins of sexual preferences for chemical signals remain poorly understood, due, in part, to scant information on the molecules involved. In the current study, we identified a male pheromone in lake char (Salvelinus namaycush) to evaluate the hypothesis that it exploits a non-sexual preference for juvenile odour. In anadromous char species, the odour of stream-resident juveniles guides migratory adults into spawning streams. Lake char are also attracted to juvenile odour but have lost the anadromous phenotype and spawn on nearshore reefs, where juvenile odour does not persist long enough to act as a cue for spawning site selection by adults. Previous behavioural data raised the possibility that males release a pheromone that includes components of juvenile odour. Using metabolomics, we found that the most abundant molecule released by males was also released by juveniles but not females. Tandem mass spectrometry and nuclear magnetic resonance were used to identify the molecule as taurocholic acid (TCA), which was previously implicated as a component of juvenile odour. Additional chemical analyses revealed that males release TCA at high rates via their urine during the spawning season. Finally, picomolar concentrations of TCA attracted pre-spawning and spawning females but not males. Taken together, our results indicate that male lake char release TCA as a mating pheromone and support the hypothesis that the pheromone is a partial match of juvenile odour.
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Affiliation(s)
- Tyler J. Buchinger
- Department of Fisheries and Wildlife, Michigan State University, East Lansing, MI 48824, USA
| | - Ke Li
- Department of Fisheries and Wildlife, Michigan State University, East Lansing, MI 48824, USA
| | - Ugo Bussy
- Department of Fisheries and Wildlife, Michigan State University, East Lansing, MI 48824, USA
| | - Belinda Huerta
- Department of Fisheries and Wildlife, Michigan State University, East Lansing, MI 48824, USA
| | - Sonam Tamrakar
- Department of Fisheries and Wildlife, Michigan State University, East Lansing, MI 48824, USA
| | - Nicholas S. Johnson
- US Geological Survey, Great Lakes Science Center, Hammond Bay Biological Station, Millersburg, MI 49759, USA
| | - Weiming Li
- Department of Fisheries and Wildlife, Michigan State University, East Lansing, MI 48824, USA
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3
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Higuchi S, Wood C, Nasiri RH, Giddla LJ, Molina V, Diarra R, DiPatrizio NV, Kawamura A, Haeusler RA. The 16α-hydroxylated Bile Acid, Pythocholic Acid Decreases Food Intake and Increases Oleoylethanolamide in Male Mice. Endocrinology 2023; 164:bqad116. [PMID: 37490843 PMCID: PMC10407715 DOI: 10.1210/endocr/bqad116] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Revised: 07/20/2023] [Accepted: 07/21/2023] [Indexed: 07/27/2023]
Abstract
Modulation of bile acid (BA) structure is a potential strategy for obesity and metabolic disease treatment. BAs act not only as signaling molecules involved in energy expenditure and glucose homeostasis, but also as regulators of food intake. The structure of BAs, particularly the position of the hydroxyl groups of BAs, impacts food intake partly by intestinal effects: (1) modulating the activity of N-acyl phosphatidylethanolamine phospholipase D, which produces the anorexigenic bioactive lipid oleoylethanolamide (OEA) or (2) regulating lipid absorption and the gastric emptying-satiation pathway. We hypothesized that 16α-hydroxylated BAs uniquely regulate food intake because of the long intermeal intervals in snake species in which these BAs are abundant. However, the effects of 16α-hydroxylated BAs in mammals are completely unknown because they are not naturally found in mammals. To test the effect of 16α-hydroxylated BAs on food intake, we isolated the 16α-hydroxylated BA pythocholic acid from ball pythons (Python regius). Pythocholic acid or deoxycholic acid (DCA) was given by oral gavage in mice. DCA is known to increase N-acyl phosphatidylethanolamine phospholipase D activity better than other mammalian BAs. We evaluated food intake, OEA levels, and gastric emptying in mice. We successfully isolated pythocholic acid from ball pythons for experimental use. Pythocholic acid treatment significantly decreased food intake in comparison to DCA treatment, and this was associated with increased jejunal OEA, but resulted in no change in gastric emptying or lipid absorption. The exogenous BA pythocholic acid is a novel regulator of food intake and the satiety signal for OEA in the mouse intestine.
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Affiliation(s)
- Sei Higuchi
- Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, St. John's University, Queens, NY 11439, USA
- Naomi Berrie Diabetes Center and Department of Pathology and Cell Biology, Columbia University, New York, NY 10032, USA
| | - Courtney Wood
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, CA 92521, USA
| | - Raidah H Nasiri
- Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, St. John's University, Queens, NY 11439, USA
| | - Leela J Giddla
- Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, St. John's University, Queens, NY 11439, USA
| | - Valentina Molina
- Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, St. John's University, Queens, NY 11439, USA
| | - Rokia Diarra
- Department of Biological Sciences, St. John's University, Queens, NY 11439, USA
| | - Nicholas V DiPatrizio
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, CA 92521, USA
| | - Akira Kawamura
- Department of Chemistry, Hunter College of CUNY, New York, NY 10065, USA
| | - Rebecca A Haeusler
- Naomi Berrie Diabetes Center and Department of Pathology and Cell Biology, Columbia University, New York, NY 10032, USA
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4
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Luengo JM, Olivera ER. Identification and Characterization of Some Genes, Enzymes, and Metabolic Intermediates Belonging to the Bile Acid Aerobic Catabolic Pathway from Pseudomonas. Methods Mol Biol 2023; 2704:51-83. [PMID: 37642838 DOI: 10.1007/978-1-0716-3385-4_4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/31/2023]
Abstract
The study of the catabolic potential of microbial species isolated from different habitats has allowed the identification and characterization of bacteria able to assimilate bile acids and/or other steroids (e.g., testosterone and 4-androsten-3,17-dione) under aerobic conditions through the 9,10-seco pathway. From soil samples, we have isolated several strains belonging to genus Pseudomonas that grow efficiently in chemically defined media containing some cyclopentane-perhydrophenanthrene derivatives as carbon sources. Genetic and biochemical studies performed with one of these bacteria (P. putida DOC21) allowed the identification of the genes and enzymes belonging to the route involved in bile acids and androgens, the 9,10-seco pathway in this bacterium. In this manuscript, we describe the most relevant methods used in our lab for the identification of the chromosomal location and nucleotide sequence of the catabolic genes (or gene clusters) encoding the enzymes of this pathway, and the tools useful to establish the role of some of the enzymes that participate in this route.
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Affiliation(s)
- José M Luengo
- Departamento de Biología Molecular (Área de Bioquímica y Biología Molecular), Facultad de Veterinaria, Universidad de León, León, Spain
| | - Elias R Olivera
- Departamento de Biología Molecular (Área de Bioquímica y Biología Molecular), Facultad de Veterinaria, Universidad de León, León, Spain.
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5
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Scanes CG, Witt J, Ebeling M, Schaller S, Baier V, Bone AJ, Preuss TG, Heckmann D. Quantitative Morphometric, Physiological, and Metabolic Characteristics of Chickens and Mallards for Physiologically Based Kinetic Model Development. Front Physiol 2022; 13:858283. [PMID: 35464078 PMCID: PMC9019682 DOI: 10.3389/fphys.2022.858283] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Accepted: 02/17/2022] [Indexed: 11/25/2022] Open
Abstract
Physiologically based kinetic (PBK) models are a promising tool for xenobiotic environmental risk assessment that could reduce animal testing by predicting in vivo exposure. PBK models for birds could further our understanding of species-specific sensitivities to xenobiotics, but would require species-specific parameterization. To this end, we summarize multiple major morphometric and physiological characteristics in chickens, particularly laying hens (Gallus gallus) and mallards (Anas platyrhynchos) in a meta-analysis of published data. Where such data did not exist, data are substituted from domesticated ducks (Anas platyrhynchos) and, in their absence, from chickens. The distribution of water between intracellular, extracellular, and plasma is similar in laying hens and mallards. Similarly, the lengths of the components of the small intestine (duodenum, jejunum, and ileum) are similar in chickens and mallards. Moreover, not only are the gastrointestinal absorptive areas similar in mallard and chickens but also they are similar to those in mammals when expressed on a log basis and compared to log body weight. In contrast, the following are much lower in laying hens than mallards: cardiac output (CO), hematocrit (Hct), and blood hemoglobin. There are shifts in ovary weight (increased), oviduct weight (increased), and plasma/serum concentrations of vitellogenin and triglyceride between laying hens and sexually immature females. In contrast, reproductive state does not affect the relative weights of the liver, kidneys, spleen, and gizzard.
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Affiliation(s)
- Colin G. Scanes
- Department of Poultry Science, University of Arkansas, Fayetteville, AR, United States
- Department of Biological Science, University of Wisconsin Milwaukee, Milwaukee, WI, United States
- *Correspondence: Colin G. Scanes,
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6
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Obino Mastella AM, Rodrigues CE, Kist TBL, Ramos Pereira MJ. Take a good catch at the scat: carboxylic and sulfonic acid profiles as a non-invasive tool for species identification and sex determination in neotropical carnivores. STUDIES ON NEOTROPICAL FAUNA AND ENVIRONMENT 2021. [DOI: 10.1080/01650521.2021.1994786] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Ana Maria Obino Mastella
- BiMaLab – Bird and Mammal Evolution, Systematics and Ecology Lab, Ppgban – Graduate Program in Animal Biology, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Brazil
| | - Carlos Eduardo Rodrigues
- Ppgbcm – Graduate Program in Cellular and Molecular Biology, Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, Brazil
- Laboratory of Methods, Department of Biophysics, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Brazil
| | - Tarso B. Ledur Kist
- Laboratory of Methods, Department of Biophysics, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Brazil
| | - Maria João Ramos Pereira
- BiMaLab – Bird and Mammal Evolution, Systematics and Ecology Lab, Ppgban – Graduate Program in Animal Biology, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Brazil
- Cesam – Centre for Environmental and Marine Studies, University of Aveiro, Aveiro, Portugal
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7
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Reiter S, Dunkel A, Dawid C, Hofmann T. Targeted LC-MS/MS Profiling of Bile Acids in Various Animal Tissues. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:10572-10580. [PMID: 34490775 DOI: 10.1021/acs.jafc.1c03433] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Bile acids are being increasingly investigated in humans and laboratory animals as markers for various diseases in addition to their important functions, such as promoting the emulsification in fat digestion and preventing gallstone formation. In humans and animals, primary bile acids are formed from cholesterol in the liver, converted in the intestine into various secondary bile acids by the intestinal microbiota and reabsorbed in the terminal ileum, and partially returned to the liver. A universal high-throughput workflow, including a simple workup, was applied as a tool for bile acid analysis in animal studies. The complex bile acid profiles in various tissues, organs, and body fluids from different animals were mapped using a newly developed comprehensive liquid chromatography-tandem mass spectrometry method. The method can also be used in screening food to obtain information about the nutritional content of bile acids. This could be relevant to investigations on various animal diseases and on the bioavailability of bile acids that pass through the gastric tract.
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Affiliation(s)
- Sinah Reiter
- Chair of Food Chemistry and Molecular Sensory Science, Technical University of Munich, Lise-Meitner-Straße 34, D-85354 Freising, Germany
- ZIEL-Institute for Food and Health, Technical University of Munich, Weihenstephaner Berg 1, 85354 Freising, Germany
| | - Andreas Dunkel
- Leibniz-Institute for Food Systems Biology at the Technical University of Munich, Lise-Meitner-Straße 34, 85354 Freising, Germany
| | - Corinna Dawid
- Chair of Food Chemistry and Molecular Sensory Science, Technical University of Munich, Lise-Meitner-Straße 34, D-85354 Freising, Germany
| | - Thomas Hofmann
- Chair of Food Chemistry and Molecular Sensory Science, Technical University of Munich, Lise-Meitner-Straße 34, D-85354 Freising, Germany
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8
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Sheps JA, Wang R, Wang J, Ling V. The protective role of hydrophilic tetrahydroxylated bile acids (THBA). Biochim Biophys Acta Mol Cell Biol Lipids 2021; 1866:158925. [PMID: 33713832 DOI: 10.1016/j.bbalip.2021.158925] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2021] [Revised: 02/21/2021] [Accepted: 03/05/2021] [Indexed: 01/14/2023]
Abstract
Bile acids are key components of bile required for human health. In humans and mice, conditions of reduced bile flow, cholestasis, induce bile acid detoxification by producing tetrahydroxylated bile acids (THBA), more hydrophilic and less cytotoxic than the usual bile acids, which are typically di- or tri-hydroxylated. Mice deficient in the Bile Salt Export Pump (Bsep, or Abcb11), the primary bile acid transporter in liver cells, produce high levels of THBA, and avoid the severe liver damage typically seen in humans with BSEP deficiencies. THBA can suppress bile acid-induced liver damage in Mdr2-deficient mice, caused by their lack of phospholipids in bile exposing their biliary tracts to unbound bile acids. Here we review THBA-related works in both animals and humans, and discuss their potential relevance and applications as a class of functional bile acids.
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Affiliation(s)
- Jonathan A Sheps
- BC Cancer Research Centre, BC Cancer Agency, Vancouver, British Columbia V5Z 1L3, Canada
| | - Renxue Wang
- BC Cancer Research Centre, BC Cancer Agency, Vancouver, British Columbia V5Z 1L3, Canada
| | - Jianshe Wang
- Department of Pediatrics, Fudan University Shanghai Medical College, The Center for Pediatric Liver Diseases, Children's Hospital of Fudan University, Shanghai 201102, China
| | - Victor Ling
- BC Cancer Research Centre, BC Cancer Agency, Vancouver, British Columbia V5Z 1L3, Canada; Department of Pathology and Laboratory Medicine, University of British Columbia Vancouver, British Columbia, Canada.
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9
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Bile acids and oxo-metabolites as markers of human faecal input in the ancient Pompeii ruins. Sci Rep 2021; 11:3650. [PMID: 33574393 PMCID: PMC7878498 DOI: 10.1038/s41598-021-82831-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Accepted: 01/06/2021] [Indexed: 11/09/2022] Open
Abstract
Small organic molecules, lipids, proteins, and DNA fragments can remain stable over centuries. Powerful and sensitive chemical analysis can therefore be used to characterize ancient remains for classical archaeological studies. This bio-ecological dimension of archaeology can contribute knowledge about several aspects of ancient life, including social organization, daily habits, nutrition, and food storage. Faecal remains (i.e. coprolites) are particularly interesting in this regard, with scientists seeking to identify new faecal markers. Here, we report the analysis of faecal samples from modern-day humans and faecal samples from a discharge pit on the site of the ruins of ancient Pompeii. We propose that bile acids and their gut microbiota oxo-metabolites are the most specific steroid markers for detecting faecal inputs. This is due to their extreme chemical stability and their exclusive occurrence in vertebrate faeces, compared to other ubiquitous sterols and steroids.
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10
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Herring CM, Bazer FW, Wu G. Amino Acid Nutrition for Optimum Growth, Development, Reproduction, and Health of Zoo Animals. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2021; 1285:233-253. [PMID: 33770410 DOI: 10.1007/978-3-030-54462-1_12] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Proteins are large polymers of amino acids (AAs) linked via peptide bonds, and major components for the growth and development of tissues in zoo animals (including mammals, birds, and fish). The proteinogenic AAs are alanine, arginine, aspartate, asparagine, cysteine, glutamate, glutamine, glycine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, proline, serine, threonine, tryptophan, tyrosine, and valine. Except for glycine, they are all present in the L-isoform. Some carnivores may also need taurine (a nonproteinogenic AA) in their diet. Adequate dietary intakes of AAs are necessary for the growth, development, reproduction, health and longevity of zoo animals. Extensive research has established dietary nutrient requirements for humans, domestic livestock and companion animals. However, this is not true for many exotic or endangered species found in zoos due to the obstacles that accompany working with these species. Information on diets and nutrient profiles of free-ranging animals is needed. Even with adequate dietary intake of crude protein, dietary AAs may still be unbalanced, which can lead to nutrition-related diseases and disorders commonly observed in captive zoo species, such as dilated cardiomyopathy, urolithiasis, gut dysbiosis, and hormonal imbalances. There are differences in AA metabolism among carnivores, herbivores and omnivores. It is imperative to consider these idiosyncrasies when formulating diets based on established nutritional requirements of domestic species. With optimal health, populations of zoo animals will have a vastly greater chance of thriving in captivity. For endangered species especially, maintaining stable captive populations is crucial for conservation. Thus, adequate provision of AAs in diets plays a crucial role in the management, sustainability and expansion of healthy zoo animals.
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Affiliation(s)
- Cassandra M Herring
- Department of Animal Science, Texas A&M University, College Station, TX, USA
| | - Fuller W Bazer
- Department of Animal Science, Texas A&M University, College Station, TX, USA
| | - Guoyao Wu
- Department of Animal Science, Texas A&M University, College Station, TX, USA.
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11
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Yuan Y, Wang QY, Zhang J, Nie J, Zhou CG, Yi WQ, Wan LS, Chen JC. A new bile acid from the traditional chinese medicine shedan. JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH 2020; 22:879-885. [PMID: 31535572 DOI: 10.1080/10286020.2019.1656616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Revised: 08/08/2019] [Accepted: 08/12/2019] [Indexed: 06/10/2023]
Abstract
A new bile acid tauro-16β-hydroxy-12α-sulfate-5β-cholenoic acid (1), along with six known ones (2-7), was isolated from the snake bile. Its planar structure and relative configuration were elucidated based on extensive spectroscopic analyses. Moreover, compound 2 showed inhibitory effect on NO production in RAW 264.7 macrophages at non-cytotoxic concentration (20 μM) with inhibitory rate of 69.7%. [Formula: see text].
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Affiliation(s)
- Yan Yuan
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, Pharmaceutical Science Department of Tongji Medical School, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Qiu-Yan Wang
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, Pharmaceutical Science Department of Tongji Medical School, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Jie Zhang
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, Pharmaceutical Science Department of Tongji Medical School, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Jing Nie
- Hubei Institute for Drug Control, Wuhan 430075, China
| | - Cheng-Gao Zhou
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, Pharmaceutical Science Department of Tongji Medical School, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Wen-Qin Yi
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, Pharmaceutical Science Department of Tongji Medical School, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Luo-Sheng Wan
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, Pharmaceutical Science Department of Tongji Medical School, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Jia-Chun Chen
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, Pharmaceutical Science Department of Tongji Medical School, Huazhong University of Science and Technology, Wuhan 430030, China
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12
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Abstract
PURPOSE OF REVIEW Studies have identified several effects of bile acids (BAs) in glucose homeostasis, energy expenditure, and body weight control, through receptor-dependent and independent mechanisms. BAs are produced from cholesterol and characterized by their structures, which result from enzymes in the liver and the gut microbiota. The aim of this review is to characterize the effects of BA structure and composition on diabetes. RECENT FINDINGS The hydroxyl groups of BAs interact with binding pockets of receptors and enzymes that affect glucose homeostasis. Human and animal studies show that BA composition is associated with insulin resistance and food intake regulation. The hydroxylation of BAs and BA composition contributes to glucose regulation. Modulation of BA composition has the potential to improve glucose metabolism.
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Affiliation(s)
- Sei Higuchi
- Naomi Berrie Diabetes Center and Department of Pathology and Cell Biology, Columbia University, New York, NY, USA.
- Russ Berrie Pavilion, Room 315, 1150 St. Nicholas Ave., New York, NY, 10032, USA.
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13
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Wong WM, Cao J, Zhang X, Doyle WI, Mercado LL, Gautron L, Meeks JP. Physiology-forward identification of bile acid-sensitive vomeronasal receptors. SCIENCE ADVANCES 2020; 6:eaaz6868. [PMID: 32523992 PMCID: PMC7259934 DOI: 10.1126/sciadv.aaz6868] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Accepted: 03/20/2020] [Indexed: 06/11/2023]
Abstract
The mouse accessory olfactory system (AOS) supports social and reproductive behavior through the sensation of environmental chemosignals. A growing number of excreted steroids have been shown to be potent AOS cues, including bile acids (BAs) found in feces. As is still the case with most AOS ligands, the specific receptors used by vomeronasal sensory neurons (VSNs) to detect BAs remain unknown. To identify VSN BA receptors, we first performed a deep analysis of VSN BA tuning using volumetric GCaMP6f/s Ca2+ imaging. These experiments revealed multiple populations of BA-receptive VSNs with submicromolar sensitivities. We then developed a new physiology-forward approach for identifying AOS ligand-receptor interactions, which we call Fluorescence Live Imaging for Cell Capture and RNA sequencing, or FLICCR-seq. FLICCR-seq analysis revealed five specific V1R family receptors enriched in BA-sensitive VSNs. These studies introduce a powerful new approach for ligand-receptor matching and reveal biological mechanisms underlying mammalian BA chemosensation.
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Affiliation(s)
- Wen Mai Wong
- Department of Neuroscience, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, Texas, USA
| | - Jie Cao
- Department of Neuroscience, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, Texas, USA
| | - Xingjian Zhang
- Department of Neuroscience, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, Texas, USA
| | - Wayne I. Doyle
- Department of Neuroscience, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, Texas, USA
| | - Luis L. Mercado
- Division of Hypothalamic Research and Department of Internal Medicine, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, Texas, USA
| | - Laurent Gautron
- Division of Hypothalamic Research and Department of Internal Medicine, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, Texas, USA
| | - Julian P. Meeks
- Department of Neuroscience, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, Texas, USA
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14
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Kirilenko BM, Hagey LR, Barnes S, Falany CN, Hiller M. Evolutionary Analysis of Bile Acid-Conjugating Enzymes Reveals a Complex Duplication and Reciprocal Loss History. Genome Biol Evol 2019; 11:3256-3268. [PMID: 31670760 PMCID: PMC6934887 DOI: 10.1093/gbe/evz238] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/30/2019] [Indexed: 12/01/2022] Open
Abstract
To fulfill their physiological functions, bile acids are conjugated with amino acids. In humans, conjugation is catalyzed by bile acid coenzyme A: amino acid N-acyltransferase (BAAT), an enzyme with a highly conserved catalytic triad in its active site. Interestingly, the conjugated amino acids are highly variable among mammals, with some species conjugating bile acids with both glycine and taurine, whereas others conjugate only taurine. The genetic origin of these bile acid conjugation differences is unknown. Here, we tested whether mutations in BAAT’s catalytic triad could explain bile acid conjugation differences. Our comparative analysis of 118 mammals first revealed that the ancestor of placental mammals and marsupials possessed two genes, BAAT and BAATP1, that arose by a tandem duplication. This duplication was followed by numerous gene losses, including BAATP1 in humans. Losses of either BAAT or BAATP1 largely happened in a reciprocal fashion, suggesting that a single conjugating enzyme is generally sufficient for mammals. In intact BAAT and BAATP1 genes, we observed multiple changes in the catalytic triad between Cys and Ser residues. Surprisingly, although mutagenesis experiments with the human enzyme have shown that replacing Cys for Ser greatly diminishes the glycine-conjugating ability, across mammals we found that this residue provides little power in predicting the experimentally measured amino acids that are conjugated with bile acids. This suggests that the mechanism of BAAT’s enzymatic function is incompletely understood, despite relying on a classic catalytic triad. More generally, our evolutionary analysis indicates that results of mutagenesis experiments may not easily be extrapolatable to other species.
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Affiliation(s)
- Bogdan M Kirilenko
- Max Planck Institute of Molecular Cell Biology and Genetics, Dresden, Germany.,Max Planck Institute for the Physics of Complex Systems, Dresden, Germany.,Center for Systems Biology, Dresden, Germany
| | - Lee R Hagey
- Department of Medicine, University of California at San Diego, USA
| | - Stephen Barnes
- Department of Pharmacology and Toxicology, Targeted Metabolomics and Proteomics Laboratory, University of Alabama, Birmingham, USA
| | - Charles N Falany
- Department of Pharmacology and Toxicology, Targeted Metabolomics and Proteomics Laboratory, University of Alabama, Birmingham, USA
| | - Michael Hiller
- Max Planck Institute of Molecular Cell Biology and Genetics, Dresden, Germany.,Max Planck Institute for the Physics of Complex Systems, Dresden, Germany.,Center for Systems Biology, Dresden, Germany
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15
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Signatures of Relaxed Selection in the CYP8B1 Gene of Birds and Mammals. J Mol Evol 2019; 87:209-220. [DOI: 10.1007/s00239-019-09903-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Accepted: 07/25/2019] [Indexed: 01/26/2023]
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16
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Sharma V, Hiller M. Loss of Enzymes in the Bile Acid Synthesis Pathway Explains Differences in Bile Composition among Mammals. Genome Biol Evol 2018; 10:3211-3217. [PMID: 30388264 PMCID: PMC6296402 DOI: 10.1093/gbe/evy243] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/30/2018] [Indexed: 12/11/2022] Open
Abstract
Bile acids are important for absorbing nutrients. Most mammals produce cholic and chenodeoxycholic bile acids. Here, we investigated genes in the bile acid synthesis pathway in four mammals that deviate from the usual mammalian bile composition. First, we show that naked-mole rats, elephants, and manatees repeatedly inactivated CYP8B1, an enzyme uniquely required for cholic acid synthesis, which explains the absence of cholic acid in these species. Second, no gene-inactivating mutations were found in any pathway gene in the rhinoceros, a species that lacks bile acids, indicating an evolutionarily recent change in its bile composition. Third, elephants and/or manatees that also lack bile acids altogether have lost additional nonessential enzymes (SLC27A5, ACOX2). Apart from uncovering genomic differences explaining deviations in bile composition, our analysis of bile acid enzymes in bile acid-lacking species suggests that essentiality prevents gene loss, while loss of pleiotropic genes is permitted if their other functions are compensated by functionally related proteins.
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Affiliation(s)
- Virag Sharma
- Max Planck Institute of Molecular Cell Biology and Genetics, Dresden, Germany.,Max Planck Institute for the Physics of Complex Systems, Dresden, Germany.,Center for Systems Biology Dresden, Dresden, Germany.,CRTD-DFG Center for Regenerative Therapies Dresden, Carl Gustav Carus Faculty of Medicine, Technische Universität Dresden, Dresden; Paul Langerhans Institute Dresden (PLID) of the Helmholtz Center Munich at University Hospital Carl Gustav Carus and Faculty of Medicine, Technische Universität Dresden, Dresden; and German Center for Diabetes Research (DZD), Munich, Neuherberg, Germany
| | - Michael Hiller
- Max Planck Institute of Molecular Cell Biology and Genetics, Dresden, Germany.,Max Planck Institute for the Physics of Complex Systems, Dresden, Germany.,Center for Systems Biology Dresden, Dresden, Germany
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17
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Abstract
Steroids play vital roles in animal physiology across species, and the production of specific steroids is associated with particular internal biological functions. The internal functions of steroids are, in most cases, quite clear. However, an important feature of many steroids (their chemical stability) allows these molecules to play secondary, external roles as chemical messengers after their excretion via urine, feces, or other shed substances. The presence of steroids in animal excretions has long been appreciated, but their capacity to serve as chemosignals has not received as much attention. In theory, the blend of steroids excreted by an animal contains a readout of its own biological state. Initial mechanistic evidence for external steroid chemosensation arose from studies of many species of fish. In sea lampreys and ray-finned fishes, bile salts were identified as potent olfactory cues and later found to serve as pheromones. Recently, we and others have discovered that neurons in amphibian and mammalian olfactory systems are also highly sensitive to excreted glucocorticoids, sex steroids, and bile acids, and some of these molecules have been confirmed as mammalian pheromones. Steroid chemosensation in olfactory systems, unlike steroid detection in most tissues, is performed by plasma membrane receptors, but the details remain largely unclear. In this review, we present a broad view of steroid detection by vertebrate olfactory systems, focusing on recent research in fishes, amphibians, and mammals. We review confirmed and hypothesized mechanisms of steroid chemosensation in each group and discuss potential impacts on vertebrate social communication.
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18
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Frisch K, Alstrup AKO. On the Evolution of Bile Salts and the Farnesoid X Receptor in Vertebrates. Physiol Biochem Zool 2018; 91:797-813. [DOI: 10.1086/695810] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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19
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Zhang J, Fan Y, Gong Y, Chen X, Wan L, Zhou C, Zhou J, Ma S, Wei F, Chen J, Nie J. Simultaneous determination of nine kinds of dominating bile acids in various snake bile by ultrahigh-performance liquid chromatography with triple quadrupole linear iontrap mass spectrometry. J Chromatogr B Analyt Technol Biomed Life Sci 2017; 1068-1069:245-252. [DOI: 10.1016/j.jchromb.2017.09.037] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Revised: 09/20/2017] [Accepted: 09/21/2017] [Indexed: 01/31/2023]
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20
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Kurogi K, Yoshihama M, Horton A, Schiefer IT, Krasowski MD, Hagey LR, Williams FE, Sakakibara Y, Kenmochi N, Suiko M, Liu MC. Identification and characterization of 5α-cyprinol-sulfating cytosolic sulfotransferases (Sults) in the zebrafish (Danio rerio). J Steroid Biochem Mol Biol 2017; 174:120-127. [PMID: 28807679 PMCID: PMC5675747 DOI: 10.1016/j.jsbmb.2017.08.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Revised: 08/05/2017] [Accepted: 08/07/2017] [Indexed: 12/31/2022]
Abstract
5α-Cyprinol 27-sulfate is the major biliary bile salt present in cypriniform fish including the zebrafish (Danio rerio). The current study was designed to identify the zebrafish cytosolic sulfotransferase (Sult) enzyme(s) capable of sulfating 5α-cyprinol and to characterize the zebrafish 5α-cyprinol-sulfating Sults in comparison with human SULT2A1. Enzymatic assays using zebrafish homogenates showed 5α-cyprinol-sulfating activity. A systematic analysis, using a panel of recombinant zebrafish Sults, revealed two Sult2 subfamily members, Sult2st2 and Sult2st3, as major 5α-cyprinol-sulfating Sults. Both enzymes showed higher activities using 5α-cyprinol as the substrate, compared to their activity with DHEA, a representative substrate for mammalian SULT2 family members, particularly SULT2A1. pH-Dependence and kinetics experiments indicated that the catalytic properties of zebrafish Sult2 family members in mediating the sulfation of 5α-cyprinol were different from those of either zebrafish Sult3st4 or human SULT2A1. Collectively, these results imply that both Sult2st2 and Sult2st3 have evolved to sulfate specifically C27-bile alcohol, 5α-cyprinol, in Cypriniform fish, whereas the enzymatic characteristics of zebrafish Sult3 members, particularly Sult3st4, correlated with those of human SULT2A1.
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Affiliation(s)
- Katsuhisa Kurogi
- Department of Pharmacology, College of Pharmacy, University of Toledo Health Science Campus, Toledo, OH 43614, USA; Biochemistry and Applied Biosciences, University of Miyazaki, Miyazaki 889-2192, Japan
| | - Maki Yoshihama
- Department of Pharmacology, College of Pharmacy, University of Toledo Health Science Campus, Toledo, OH 43614, USA; Frontier Research Center, University of Miyazaki, Miyazaki 889-2192, Japan
| | - Austin Horton
- Department of Pharmacology, College of Pharmacy, University of Toledo Health Science Campus, Toledo, OH 43614, USA
| | - Isaac T Schiefer
- Department of Pharmacology, College of Pharmacy, University of Toledo Health Science Campus, Toledo, OH 43614, USA
| | - Matthew D Krasowski
- Department of Pathology, University of Iowa Hospitals and Clinics, RCP 6233, 200 Hawkins Drive, Iowa City, IA 52242, USA
| | - Lee R Hagey
- Department of Medicine, University of California at San Diego, La Jolla, San Diego, CA 92093, USA
| | - Frederick E Williams
- Department of Pharmacology, College of Pharmacy, University of Toledo Health Science Campus, Toledo, OH 43614, USA
| | - Yoichi Sakakibara
- Biochemistry and Applied Biosciences, University of Miyazaki, Miyazaki 889-2192, Japan
| | - Naoya Kenmochi
- Frontier Research Center, University of Miyazaki, Miyazaki 889-2192, Japan
| | - Masahito Suiko
- Biochemistry and Applied Biosciences, University of Miyazaki, Miyazaki 889-2192, Japan
| | - Ming-Cheh Liu
- Department of Pharmacology, College of Pharmacy, University of Toledo Health Science Campus, Toledo, OH 43614, USA.
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21
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Higashiyama H, Uemura M, Igarashi H, Kurohmaru M, Kanai-Azuma M, Kanai Y. Anatomy and development of the extrahepatic biliary system in mouse and rat: a perspective on the evolutionary loss of the gallbladder. J Anat 2017; 232:134-145. [PMID: 29023691 DOI: 10.1111/joa.12707] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/23/2017] [Indexed: 12/13/2022] Open
Abstract
The gallbladder is the hepatobiliary organ for storing and secreting bile fluid, and is a synapomorphy of extant vertebrates. However, this organ has been frequently lost in several lineages of birds and mammals, including rodents. Although it is known as the traditional problem, the differences in development between animals with and without gallbladders are not well understood. To address this research gap, we compared the anatomy and development of the hepatobiliary systems in mice (gallbladder is present) and rats (gallbladder is absent). Anatomically, almost all parts of the hepatobiliary system of rats are topographically the same as those of mice, but rats have lost the gallbladder and cystic duct completely. During morphogenesis, the gallbladder-cystic duct domain (Gb-Cd domain) and its primordium, the biliary bud, do not develop in the rat. In the early stages, SOX17, a master regulator of gallbladder formation, is positive in the murine biliary bud epithelium, as seen in other vertebrates with a gallbladder, but there is no SOX17-positive domain in the rat hepatobiliary primordia. These findings suggest that the evolutionary loss of the Gb-Cd domain should be translated simply as the absence of a biliary bud at an early stage, which may correlate with alterations in regulatory genes, such as Sox17, in the rat. A SOX17-positive biliary bud is clearly definable as a developmental module that may be involved in the frequent loss of gallbladder in mammals.
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Affiliation(s)
| | - Mami Uemura
- Laboratory of Veterinary Anatomy, The University of Tokyo, Tokyo, Japan.,Center for Experimental Animals, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan
| | - Hitomi Igarashi
- Laboratory of Veterinary Anatomy, The University of Tokyo, Tokyo, Japan
| | | | - Masami Kanai-Azuma
- Center for Experimental Animals, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan
| | - Yoshiakira Kanai
- Laboratory of Veterinary Anatomy, The University of Tokyo, Tokyo, Japan
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22
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Shiffka SJ, Kane MA, Swaan PW. Planar bile acids in health and disease. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2017; 1859:2269-2276. [PMID: 28887043 DOI: 10.1016/j.bbamem.2017.08.019] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Revised: 08/24/2017] [Accepted: 08/29/2017] [Indexed: 12/26/2022]
Abstract
Bile acids are the amphipathic primary end-products of cholesterol metabolism that aid in digestion as well as participate in signal transduction in several hepatic and enteric pathways. Despite the reputation of bile acids as signaling molecules implicated in disease states such as cancer and diabetes, there remain numerous bile acid species that are weakly characterized in either physiological or pathological conditions. This review presents one such group: the flat or planar bile acids, a set of bile acids found in humans during infancy and occurring again during certain diseases. As their name implies, these molecules are structurally distinct from the typical human bile acids, retaining the planar structure of their cholesterol predecessor instead of bending or twisting at the A ring. This review defines these species of bile acids in detail and describes their presence in infancy, gestation, and in disease. The large gaps in research regarding the flat bile acids are highlighted and all available experimental knowledge collected as far as 60years ago is summarized. Further, the potential for these molecules as endogenous biomarkers of liver disease and injury is discussed. Finally, the flat bile salts found in humans are compared to the ancestral and evolutionary older bile salts, which similarly have a flat steroidal structure, as mechanisms of flat bile acid biosynthesis are explored.
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Affiliation(s)
- Stephanie J Shiffka
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, 20 Penn Street, Baltimore, MD 21201, USA
| | - Maureen A Kane
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, 20 Penn Street, Baltimore, MD 21201, USA
| | - Peter W Swaan
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, 20 Penn Street, Baltimore, MD 21201, USA.
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23
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Prost K, Birk JJ, Lehndorff E, Gerlach R, Amelung W. Steroid Biomarkers Revisited - Improved Source Identification of Faecal Remains in Archaeological Soil Material. PLoS One 2017; 12:e0164882. [PMID: 28060808 PMCID: PMC5217961 DOI: 10.1371/journal.pone.0164882] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2016] [Accepted: 10/03/2016] [Indexed: 11/24/2022] Open
Abstract
Steroids are used as faecal markers in environmental and in archaeological studies, because they provide insights into ancient agricultural practices and the former presence of animals. Up to now, steroid analyses could only identify and distinguish between herbivore, pig, and human faecal matter and their residues in soils and sediments. We hypothesized that a finer differentiation between faeces of different livestock animals could be achieved when the analyses of several steroids is combined (Δ5-sterols, 5α-stanols, 5β-stanols, epi-5β-stanols, stanones, and bile acids). We therefore reviewed the existing literature on various faecal steroids from livestock and humans and analysed faeces from old livestock breed (cattle, horse, donkey, sheep, goat, goose, and pig) and humans. Additionally, we performed steroid analyses on soil material of four different archaeological periods (sites located in the Lower Rhine Basin, Western Germany, dating to the Linearbandkeramik, Urnfield Period / Bronze Age, Iron Age, Roman Age) with known or supposed faecal inputs. By means of already established and newly applied steroid ratios of the analysed faeces together with results from the literature, all considered livestock faeces, except sheep and cattle, could be distinguished on the basis of their steroid signatures. Most remarkably was the identification of horse faeces (via the ratio: epi-5β-stigmastanol: 5β-stigmastanol + epicoprostanol: coprostanol; together with the presence of chenodeoxycholic acid) and a successful differentiation between goat (with chenodeoxycholic acid) and sheep/cattle faeces (without chenodeoxycholic acid). The steroid analysis of archaeological soil material confirmed the supposed faecal inputs, even if these inputs had occurred several thousand years ago.
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Affiliation(s)
- Katharina Prost
- Institute of Crop Science and Resource Conservation (INRES) – Soil Science and Soil Ecology, University of Bonn, Bonn, Germany
- * E-mail:
| | - Jago Jonathan Birk
- Institute for Geography - Soil Science, Johannes Gutenberg-University Mainz, Mainz, Germany
| | - Eva Lehndorff
- Institute of Crop Science and Resource Conservation (INRES) – Soil Science and Soil Ecology, University of Bonn, Bonn, Germany
| | - Renate Gerlach
- Archaeological Heritage Management Rhineland (LVR-Amt für Bodendenkmalpflege im Rheinland), Bonn, Germany
| | - Wulf Amelung
- Institute of Crop Science and Resource Conservation (INRES) – Soil Science and Soil Ecology, University of Bonn, Bonn, Germany
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24
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25
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Rapid identification of bile acids in snake bile using ultrahigh-performance liquid chromatography with electrospray ionization quadrupole time-of-flight tandem mass spectrometry. J Chromatogr B Analyt Technol Biomed Life Sci 2016; 1036-1037:157-169. [DOI: 10.1016/j.jchromb.2016.10.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2016] [Revised: 09/21/2016] [Accepted: 10/09/2016] [Indexed: 02/04/2023]
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26
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Doyle WI, Dinser JA, Cansler HL, Zhang X, Dinh DD, Browder NS, Riddington IM, Meeks JP. Faecal bile acids are natural ligands of the mouse accessory olfactory system. Nat Commun 2016; 7:11936. [PMID: 27324439 PMCID: PMC4919516 DOI: 10.1038/ncomms11936] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2015] [Accepted: 05/13/2016] [Indexed: 01/06/2023] Open
Abstract
The accessory olfactory system (AOS) guides behaviours that are important for survival and reproduction, but understanding of AOS function is limited by a lack of identified natural ligands. Here we report that mouse faeces are a robust source of AOS chemosignals and identify bile acids as a class of natural AOS ligands. Single-unit electrophysiological recordings from accessory olfactory bulb neurons in ex vivo preparations show that AOS neurons are strongly and selectively activated by peripheral stimulation with mouse faecal extracts. Faecal extracts contain several unconjugated bile acids that cause concentration-dependent neuronal activity in the AOS. Many AOS neurons respond selectively to bile acids that are variably excreted in male and female mouse faeces, and others respond to bile acids absent in mouse faeces. These results identify faeces as a natural source of AOS information, and suggest that bile acids may be mammalian pheromones and kairomones. The accessory olfactory system (AOS) processes social chemosensory information and guides behaviors that are important for survival and reproduction in mammals. Here the authors report that mouse feces are a source of AOS neuronal activity and identify unconjugated bile acids in feces as a class of natural AOS ligands.
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Affiliation(s)
- Wayne I Doyle
- Department of Neuroscience, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390, USA.,Neuroscience Graduate Program, The University of Texas, Southwestern Graduate School of Biomedical Sciences, 5323 Harry Hines Boulevard, Dallas, Texas 75390, USA
| | - Jordan A Dinser
- Department of Chemistry, The University of Texas, 120 Inner Campus Drive, Austin, Texas 78712, USA
| | - Hillary L Cansler
- Department of Neuroscience, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390, USA.,Neuroscience Graduate Program, The University of Texas, Southwestern Graduate School of Biomedical Sciences, 5323 Harry Hines Boulevard, Dallas, Texas 75390, USA
| | - Xingjian Zhang
- Department of Neuroscience, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390, USA.,Neuroscience Graduate Program, The University of Texas, Southwestern Graduate School of Biomedical Sciences, 5323 Harry Hines Boulevard, Dallas, Texas 75390, USA
| | - Daniel D Dinh
- Department of Neuroscience, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390, USA
| | - Natasha S Browder
- Department of Neuroscience, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390, USA
| | - Ian M Riddington
- Department of Chemistry, The University of Texas, 120 Inner Campus Drive, Austin, Texas 78712, USA
| | - Julian P Meeks
- Department of Neuroscience, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390, USA
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27
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Two Major Bile Acids in the Hornbills, (24R,25S)-3α,7α,24-Trihydroxy-5β-cholestan-27-oyl Taurine and Its 12α-Hydroxy Derivative. Lipids 2016; 51:757-68. [PMID: 27108034 DOI: 10.1007/s11745-016-4150-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Accepted: 03/31/2016] [Indexed: 10/21/2022]
Abstract
Two major bile acids were isolated from the gallbladder bile of two hornbill species from the Bucerotidae family of the avian order Bucerotiformes Buceros bicornis (great hornbill) and Penelopides panini (Visayan tarictic hornbill). Their structures were determined to be 3α,7α,24-dihydroxy-5β-cholestan-27-oic acid and its 12α-hydroxy derivative, 3α,7α,12α,24-tetrahydroxy-5β-cholestan-27-oic acid (varanic acid, VA), both present in bile as their corresponding taurine amidates. The four diastereomers of varanic acid were synthesized and their assigned structures were confirmed by X-ray crystallographic analysis. VA and its 12-deoxy derivative were found to have a (24R,25S)-configuration. 13 additional hornbill species were also analyzed by HPLC and showed similar bile acid patterns to B. bicornis and P. panini. The previous stereochemical assignment for (24R,25S)-VA isolated from the bile of varanid lizards and the Gila monster should now be revised to the (24S,25S)-configuration.
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28
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Sato née Okihara R, Saito T, Ogata H, Nakane N, Namegawa K, Sekiguchi S, Omura K, Kurabuchi S, Mitamura K, Ikegawa S, Raines J, Hagey LR, Hofmann AF, Iida T. Novel, major 2α- and 2β-hydroxy bile alcohols and bile acids in the bile of Arapaima gigas, a large South American river fish. Steroids 2016; 107:112-20. [PMID: 26768415 DOI: 10.1016/j.steroids.2016.01.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/02/2015] [Revised: 12/21/2015] [Accepted: 01/01/2016] [Indexed: 11/22/2022]
Abstract
Bile alcohols and bile acids from gallbladder bile of the Arapaima gigas, a large South American freshwater fish, were isolated by reversed-phase high-performance liquid chromatography. The structures of the major isolated compounds were determined by electrospray-tandem mass spectrometry and nuclear magnetic resonance using (1)H- and (13)C-NMR spectra. The novel bile salts identified were six variants of 2-hydroxy bile acids and bile alcohols in the 5α- and 5β-series, with 29% of all compounds having hydroxylation at C-2. Three C27 bile alcohols were present (as ester sulfates): (24ξ,25ξ)-5α-cholestan-2α,3α,7α,12α,24,26-hexol; (25ξ)-5β-cholestan-2β,3α,7α,12α,26,27-hexol, and (25ξ)-5α-cholestan-2α,3α,7α,12α,26,27-hexol. A single C27 bile acid was identified: (25ξ)-2α,3α,7α,12α-tetrahydroxy-5α-cholestan-26-oic acid, present as its taurine conjugate. Two novel C24 bile acids were identified: the 2α-hydroxy derivative of allochenodeoxycholic acid and the 2β-hydroxy derivative of cholic acid, both occurring as taurine conjugates. These studies extend previous work in establishing the natural occurrence of novel 2α- and 2β-hydroxy-C24 and C27 bile acids as well as C27 bile alcohols in both the normal (5β) as well as the (5α) "allo" A/B-ring juncture. The bile salt profile of A. gigas appears to be unique among vertebrates.
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Affiliation(s)
- Rika Sato née Okihara
- Department of Chemistry, College of Humanities and Sciences, Nihon University, Tokyo, Japan
| | - Tetsuya Saito
- Department of Chemistry, College of Humanities and Sciences, Nihon University, Tokyo, Japan
| | - Hiroaki Ogata
- Department of Chemistry, College of Humanities and Sciences, Nihon University, Tokyo, Japan
| | - Naoya Nakane
- Department of Chemistry, College of Humanities and Sciences, Nihon University, Tokyo, Japan
| | - Kazunari Namegawa
- Department of Chemistry, College of Humanities and Sciences, Nihon University, Tokyo, Japan
| | - Shoutaro Sekiguchi
- Department of Chemistry, College of Humanities and Sciences, Nihon University, Tokyo, Japan
| | - Kaoru Omura
- Department of Chemistry, College of Humanities and Sciences, Nihon University, Tokyo, Japan
| | - Satoshi Kurabuchi
- Faculty of Pharmaceutical Sciences, Kinki University, Higashi-Osaka, Japan
| | - Kuniko Mitamura
- Faculty of Pharmaceutical Sciences, Kinki University, Higashi-Osaka, Japan
| | - Shigeo Ikegawa
- Faculty of Pharmaceutical Sciences, Kinki University, Higashi-Osaka, Japan
| | | | - Lee R Hagey
- Department of Medicine, University of California, San Diego, CA, USA
| | - Alan F Hofmann
- Department of Medicine, University of California, San Diego, CA, USA
| | - Takashi Iida
- Department of Chemistry, College of Humanities and Sciences, Nihon University, Tokyo, Japan.
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29
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Moghimipour E, Ameri A, Handali S. Absorption-Enhancing Effects of Bile Salts. Molecules 2015; 20:14451-73. [PMID: 26266402 PMCID: PMC6332414 DOI: 10.3390/molecules200814451] [Citation(s) in RCA: 132] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Revised: 07/28/2015] [Accepted: 07/31/2015] [Indexed: 12/16/2022] Open
Abstract
Bile salts are ionic amphiphilic compounds with a steroid skeleton. Among the most important physiological properties of bile salts are lipid transport by solubilization and transport of some drugs through hydrophobic barriers. Bile salts have been extensively studied to enhance transepithelial permeability for different marker molecules and drugs. They readily agglomerate at concentrations above their critical micelle concentration (CMC). The mechanism of absorption enhancement by bile salts appears to be complex. The aim of the present article was to review bile salt structure and their application as absorption enhancers and the probable mechanism for increasing permeation based on previous studies.
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Affiliation(s)
- Eskandar Moghimipour
- Nanotechnology Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz 61357-33184, Iran.
| | - Abdulghani Ameri
- Department of Drug and Food Control, Faculty of Pharmacy, Ahvaz Jundishapur University of Medical Sciences, Ahvaz 61357-33184, Iran.
| | - Somayeh Handali
- Nanotechnology Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz 61357-33184, Iran.
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Abstract
Bile is a unique and vital aqueous secretion of the liver that is formed by the hepatocyte and modified down stream by absorptive and secretory properties of the bile duct epithelium. Approximately 5% of bile consists of organic and inorganic solutes of considerable complexity. The bile-secretory unit consists of a canalicular network which is formed by the apical membrane of adjacent hepatocytes and sealed by tight junctions. The bile canaliculi (∼1 μm in diameter) conduct the flow of bile countercurrent to the direction of portal blood flow and connect with the canal of Hering and bile ducts which progressively increase in diameter and complexity prior to the entry of bile into the gallbladder, common bile duct, and intestine. Canalicular bile secretion is determined by both bile salt-dependent and independent transport systems which are localized at the apical membrane of the hepatocyte and largely consist of a series of adenosine triphosphate-binding cassette transport proteins that function as export pumps for bile salts and other organic solutes. These transporters create osmotic gradients within the bile canalicular lumen that provide the driving force for movement of fluid into the lumen via aquaporins. Species vary with respect to the relative amounts of bile salt-dependent and independent canalicular flow and cholangiocyte secretion which is highly regulated by hormones, second messengers, and signal transduction pathways. Most determinants of bile secretion are now characterized at the molecular level in animal models and in man. Genetic mutations serve to illuminate many of their functions.
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Affiliation(s)
- James L Boyer
- Department of Medicine and Liver Center, Yale University School of Medicine, New Haven, Connecticut, USA.
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Li K, Brant CO, Siefkes MJ, Kruckman HG, Li W. Characterization of a novel bile alcohol sulfate released by sexually mature male sea lamprey (Petromyzon marinus). PLoS One 2013; 8:e68157. [PMID: 23874530 PMCID: PMC3706596 DOI: 10.1371/journal.pone.0068157] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2012] [Accepted: 05/31/2013] [Indexed: 11/18/2022] Open
Abstract
A sulphate-conjugated bile alcohol, 3,12-diketo-4,6-petromyzonene-24-sulfate (DKPES), was identified using bioassay-guided fractionation from water conditioned with sexually mature male sea lamprey (Petromyzon marinus). The structure and relative stereochemistry of DKPES was established using spectroscopic data. The electro-olfactogram (EOG) response threshold of DKPES was 10−7 Molar (M) and that of 3-keto petromyzonol sulfate (3 KPZS; a known component of the male sea lamprey sex pheromone) was 10−10 M. Behavioural studies indicated that DKPES can be detected at low concentrations by attracting sexually mature females to nests when combined with 3 KPZS. Nests baited with a mixture of DKPES and 3 KPZS (ratio 1∶29.8) attracted equal numbers of sexually mature females compared to an adjacent nest baited with 3 KPZS alone. When DKPES and 3 KPZS mixtures were applied at ratios of 2∶29.8 and 10∶29.8, the proportion of sexually mature females that entered baited nests increased to 73% and 70%, respectively. None of the sexually mature females released were attracted to nests baited with DKPES alone. These results indicated that DKPES is a component of the sex pheromone released by sexually mature male sea lamprey, and is the second biologically active compound identified from this pheromone. DKPES represents the first example that a minor component of a vertebrate pheromone can be combined with a major component to elicit critical sexual behaviors. DKPES holds considerable promise for increasing the effectiveness of pheromone-baited trapping as a means of sea lamprey control in the Laurentian Great Lakes.
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Affiliation(s)
- Ke Li
- Department of Fisheries and Wildlife, Michigan State University, East Lansing, Michigan, United States of America
| | - Cory O. Brant
- Department of Fisheries and Wildlife, Michigan State University, East Lansing, Michigan, United States of America
| | - Michael J. Siefkes
- Great Lakes Fishery Commission, Ann Arbor, Michigan, United States of America
| | - Hanna G. Kruckman
- Department of Fisheries and Wildlife, Michigan State University, East Lansing, Michigan, United States of America
| | - Weiming Li
- Department of Fisheries and Wildlife, Michigan State University, East Lansing, Michigan, United States of America
- * E-mail:
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Kuo SM, Merhige PM, Hagey LR. The effect of dietary prebiotics and probiotics on body weight, large intestine indices, and fecal bile acid profile in wild type and IL10-/- mice. PLoS One 2013; 8:e60270. [PMID: 23555939 PMCID: PMC3605333 DOI: 10.1371/journal.pone.0060270] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2012] [Accepted: 02/26/2013] [Indexed: 12/24/2022] Open
Abstract
Previous studies have suggested roles of probiotics and prebiotics on body weight management and intestinal function. Here, the effects of a dietary prebiotic, inulin (50 mg/g diet), and probiotic, Bfidobacterium animalis subsp. lactis (Bb12) (final dose verified at 105 colony forming unit (cfu)/g diet, comparable to human consumption), were determined separately and in combination in mice using cellulose-based AIN-93G diets under conditions allowed for the growth of commensal bacteria. Continuous consumption of Bb12 and/or inulin did not affect food intake or body, liver, and spleen weights of young and adult mice. Fecal bile acid profiles were determined by nanoESI-MS/MS tandem mass spectrometry. In the presence of inulin, more bacterial deconjugation of taurine from primary bile acids was observed along with an increased cecal weight. Consumption of inulin in the absence or presence of Bb12 also increased the villus cell height in the proximal colon along with a trend of higher bile acid sulfation by intestinal cells. Feeding Bb12 alone at the physiological dose did not affect bile acid deconjugation and had little effect on other intestinal indices. Although interleukin (IL)10-null mice are susceptible to enterocolitis, they maintained the same body weight as the wild type mice under our specific pathogen-free housing condition and showed no signs of inflammation. Nevertheless, they had smaller cecum suggesting a mildly compromised intestinal development even before the disease manifestation. Our results are consistent with the notion that dietary factors such as prebiotics play important roles in the growth of intestinal microbiota and may impact on the intestinal health. In addition, fecal bile acid profiling could potentially be a non-invasive tool in monitoring the intestinal environment.
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Affiliation(s)
- Shiu-Ming Kuo
- Department of Exercise and Nutrition Sciences, University at Buffalo, Buffalo, NY, USA.
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33
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Hagey LR, Ogawa S, Kato N, Satoh née Okihara R, Une M, Mitamura K, Ikegawa S, Hofmann AF, Iida T. A novel varanic acid epimer--(24R,25S)-3α,7α,12α,24-tetrahydroxy-5β-cholestan-27-oic acid--is a major biliary bile acid in two varanid lizards and the Gila monster. Steroids 2012; 77:1510-21. [PMID: 22986074 DOI: 10.1016/j.steroids.2012.08.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2012] [Revised: 08/24/2012] [Accepted: 08/29/2012] [Indexed: 10/27/2022]
Abstract
A key intermediate in the biosynthetic pathway by which C(24) bile acids are formed from cholesterol has long been considered to be varanic acid, (24ξ,25ξ)-3α,7α,12α-24-tetrahydroxy-5β-cholestan-27-oic acid. The (24R,25R)-epimer of this tetrahydroxy bile acid, in the form of its taurine N-acyl amidate, was thought to be the major biliary bile acid in lizards of the family Varanidae. We report here that a major biliary bile acid of three lizard species - the Komodo dragon (Varanus komodoensis), Gray's monitor (Varanus olivaceus), and the Gila monster (Heloderma suspectum) - is a novel epimer of varanic acid. The epimer was shown to be (24R,25S)-3α,7α,12α,24-tetrahydroxy-5β-cholestan-27-oic acid (present in bile as its taurine conjugate). The structure was established by mass spectroscopy and by (1)H and (13)C nuclear magnetic spectroscopy, as well as by synthesis of the compound.
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Affiliation(s)
- Lee R Hagey
- Department of Medicine, University of California, San Diego, La Jolla, CA 92093-063, USA.
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35
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Kurogi K, Krasowski MD, Injeti E, Liu MY, Williams FE, Sakakibara Y, Suiko M, Liu MC. A comparative study of the sulfation of bile acids and a bile alcohol by the Zebra danio (Danio rerio) and human cytosolic sulfotransferases (SULTs). J Steroid Biochem Mol Biol 2011; 127:307-14. [PMID: 21839837 PMCID: PMC3515676 DOI: 10.1016/j.jsbmb.2011.07.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/27/2011] [Revised: 07/26/2011] [Accepted: 07/29/2011] [Indexed: 01/15/2023]
Abstract
The current study was designed to examine the sulfation of bile acids and bile alcohols by the Zebra danio (Danio rerio) SULTs in comparison with human SULTs. A systematic analysis using the fifteen Zebra danio SULTs revealed that SULT3 ST2 and SULT3 ST3 were the major bile acid/alcohol-sulfating SULTs. Among the eleven human SULTs, only SULT2A1 was found to be capable of sulfating bile acids and bile alcohols. To further investigate the sulfation of bile acids and bile alcohols by the two Zebra danio SULT3 STs and the human SULT2A1, pH-dependence and kinetics of the sulfation of bile acids/alcohols were analyzed. pH-dependence experiments showed that the mechanisms underlying substrate recognition for the sulfation of lithocholic acid (a bile acid) and 5α-petromyzonol (a bile alcohol) differed between the human SULT2A1 and the Zebra danio SULT3 ST2 and ST3. Kinetic analysis indicated that both the two Zebra danio SULT3 STs preferred petromyzonol as substrate compared to bile acids. In contrast, the human SULT2A1 was more catalytically efficient toward lithocholic acid than petromyzonol. Collectively, the results imply that the Zebra danio and human SULTs have evolved to serve for the sulfation of, respectively, bile alcohols and bile acids, matching the cholanoid profile in these two vertebrate species.
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Affiliation(s)
- Katsuhisa Kurogi
- Department of Pharmacology, College of Pharmacy, The University of Toledo, Toledo, OH 43614, USA
| | - Matthew D. Krasowski
- Department of Pathology, University of Iowa Hospitals and Clinics, RCP 6233, 200 Hawkins Drive, Iowa City, IA 52242, USA
| | - Elisha Injeti
- Department of Pharmacology, College of Pharmacy, The University of Toledo, Toledo, OH 43614, USA
| | - Ming-Yih Liu
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan, ROC
| | - Frederick E. Williams
- Department of Pharmacology, College of Pharmacy, The University of Toledo, Toledo, OH 43614, USA
| | - Yoichi Sakakibara
- Biochemistry and Applied Biosciences, University of Miyazaki, Miyazaki 889-2192, Japan
| | - Masahito Suiko
- Biochemistry and Applied Biosciences, University of Miyazaki, Miyazaki 889-2192, Japan
| | - Ming-Cheh Liu
- Department of Pharmacology, College of Pharmacy, The University of Toledo, Toledo, OH 43614, USA
- Corresponding author at: Department of Pharmacology, College of Pharmacy, The University of Toledo, 3000 Arlington Avenue, Toledo, OH 43614, USA. Tel.: +1 419 383 1918; fax: +1 419 383 1909. , (M.-C. Liu)
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36
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Hagey LR, Iida T, Ogawa S, Adachi Y, Une M, Mushiake K, Maekawa M, Shimada M, Mano N, Hofmann AF. Biliary bile acids in birds of the Cotingidae family: taurine-conjugated (24R,25R)-3α,7α,24-trihydroxy-5β-cholestan-27-oic acid and two epimers (25R and 25S) of 3α,7α-dihydroxy-5β-cholestan-27-oic acid. Steroids 2011; 76:1126-35. [PMID: 21600907 DOI: 10.1016/j.steroids.2011.04.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/03/2011] [Revised: 04/25/2011] [Accepted: 04/27/2011] [Indexed: 11/29/2022]
Abstract
Three C(27) bile acids were found to be major biliary bile acids in the capuchinbird (Perissocephalus tricolor) and bare-throated bellbird (Procnias nudicollis), both members of the Cotingidae family of the order Passeriformes. The individual bile acids were isolated by preparative RP-HPLC, and their structures were established by RP-HPLC, LC/ESI-MS/MS and NMR as well as by a comparison of their chromatographic properties with those of authentic reference standards of their 12α-hydroxy derivatives. The most abundant bile acid present in the capuchinbird bile was the taurine conjugate of C(27) (24R,25R)-3α,7α,24-trihydroxy-5β-cholestan-27-oic acid, a diastereomer not previously identified as a natural bile acid. The four diastereomers of taurine-conjugated (24ξ,25ξ)-3α,7α,24-trihydroxy-5β-cholestan-27-oic acid could be distinguished by NMR and were resolved by RP-HPLC. The RRT of the diastereomers (with taurocholic acid as 1.0) were found to be increased in the following order: (24R,25R)<(24S,25R)<(24S,25S)<(24R,25S). Two epimers (25R and 25S) of C(27) 3α,7α-dihydroxy-5β-cholestan-27-oic acid were also present (as the taurine conjugates) in both bird species. Epimers of the two compounds could be distinguished by their NMR spectra and resolved by RP-HPLC with the (25S)-epimer eluting before the (25R)-epimer. Characterization of the taurine-conjugated (24R,25R)-3α,7α,24-trihydroxy-5β-cholestan-27-oic acid and two epimers (25R and 25S) of 3α,7α-dihydroxy-5β-cholestan-27-oic acid should facilitate their detection in peroxisomal disease and inborn errors of bile acid biosynthesis.
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Affiliation(s)
- Lee R Hagey
- Department of Medicine, University of California, San Diego, La Jolla, CA 92093-0063, USA
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37
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Ogawa S, Mitamura K, Ikegawa S, Krasowski MD, Hagey LR, Hofmann AF, Iida T. Chemical synthesis of the (25R)- and (25S)-epimers of 3α,7α,12α-trihydroxy-5α-cholestan-27-oic acid as well as their corresponding glycine and taurine conjugates. Chem Phys Lipids 2011; 164:368-77. [PMID: 21554864 DOI: 10.1016/j.chemphyslip.2011.04.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2011] [Revised: 04/19/2011] [Accepted: 04/20/2011] [Indexed: 11/25/2022]
Abstract
The (25R)- and (25S)-epimers of C(27) 3α,7α,12α-trihydroxy-5α-cholestan-27-oic acid as well as their corresponding N-acylamidate conjugates with glycine or taurine were prepared starting from cholic acid in 14 steps. The principal reactions involved were (1) reduction of a key intermediary C(24)allo-cholic acid performate with NaBH(4)/triethylamine/ethyl chloroformate, (2) iodination of the resulting 3,7,12-triformyloxy-5α-cholan-24-ol with I(2)/triphenylphosphine; (3) nucleophilic substitution of the iodo derivative with diethylmethyl malonate/NaH; and (4) hydrolysis of the resulting 3,7,12-triformyloxy-25-methyl-26,27-diethyl ester with KOH, followed by decarboxylation of the geminal dicarboxylic acid with LiCl. N-Acylamidation of the resulting (25R)/(25S)-3α,7α,12α-trihydroxy-5α-cholestan-27-oic acid mixture with glycine or taurine afforded the corresponding epimeric mixtures of the glycine and taurine conjugates. The (25R)- and (25S)-epimers of the three variants of unconjugated and conjugated 3α,7α,12α-trihydroxy-5α-cholestan-27-oic acid were efficiently separated by HPLC on a reversed-phase C(18) column and their structural characteristics, particularly the chiral center at C-25, delineated using (1)H and (13)C NMR. These synthetic compounds should be useful as authentic reference standards for establishing their presence in bile as well as being useful in studies on the biosynthesis of allo-bile acids from cholesterol.
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Affiliation(s)
- Shoujiro Ogawa
- Department of Chemistry, College of Humanities & Sciences, Nihon University, Setagaya, Tokyo, Japan
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Krasowski MD, Ai N, Hagey LR, Kollitz EM, Kullman SW, Reschly EJ, Ekins S. The evolution of farnesoid X, vitamin D, and pregnane X receptors: insights from the green-spotted pufferfish (Tetraodon nigriviridis) and other non-mammalian species. BMC BIOCHEMISTRY 2011; 12:5. [PMID: 21291553 PMCID: PMC3042382 DOI: 10.1186/1471-2091-12-5] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/20/2010] [Accepted: 02/03/2011] [Indexed: 12/23/2022]
Abstract
Background The farnesoid X receptor (FXR), pregnane X receptor (PXR), and vitamin D receptor (VDR) are three closely related nuclear hormone receptors in the NR1H and 1I subfamilies that share the property of being activated by bile salts. Bile salts vary significantly in structure across vertebrate species, suggesting that receptors binding these molecules may show adaptive evolutionary changes in response. We have previously shown that FXRs from the sea lamprey (Petromyzon marinus) and zebrafish (Danio rerio) are activated by planar bile alcohols found in these two species. In this report, we characterize FXR, PXR, and VDR from the green-spotted pufferfish (Tetraodon nigriviridis), an actinopterygian fish that unlike the zebrafish has a bile salt profile similar to humans. We utilize homology modelling, docking, and pharmacophore studies to understand the structural features of the Tetraodon receptors. Results Tetraodon FXR has a ligand selectivity profile very similar to human FXR, with strong activation by the synthetic ligand GW4064 and by the primary bile acid chenodeoxycholic acid. Homology modelling and docking studies suggest a ligand-binding pocket architecture more similar to human and rat FXRs than to lamprey or zebrafish FXRs. Tetraodon PXR was activated by a variety of bile acids and steroids, although not by the larger synthetic ligands that activate human PXR such as rifampicin. Homology modelling predicts a larger ligand-binding cavity than zebrafish PXR. We also demonstrate that VDRs from the pufferfish and Japanese medaka were activated by small secondary bile acids such as lithocholic acid, whereas the African clawed frog VDR was not. Conclusions Our studies provide further evidence of the relationship between both FXR, PXR, and VDR ligand selectivity and cross-species variation in bile salt profiles. Zebrafish and green-spotted pufferfish provide a clear contrast in having markedly different primary bile salt profiles (planar bile alcohols for zebrafish and sterically bent bile acids for the pufferfish) and receptor selectivity that matches these differences in endogenous ligands. Our observations to date present an integrated picture of the co-evolution of bile salt structure and changes in the binding pockets of three nuclear hormone receptors across the species studied.
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Affiliation(s)
- Matthew D Krasowski
- Department of Pathology, University of Iowa Hospitals and Clinics, Iowa City, IA 52242, USA.
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Hagey LR, Vidal N, Hofmann AF, Krasowski MD. COMPLEX EVOLUTION OF BILE SALTS IN BIRDS. THE AUK 2010; 127:820-831. [PMID: 21113274 PMCID: PMC2990222 DOI: 10.1525/auk.2010.09155] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Bile salts are the major end-metabolites of cholesterol and are important in lipid digestion and shaping of the gut microflora. There have been limited studies of bile-salt variation in birds. The purpose of our study was to determine bile-salt variation among birds and relate this variation to current avian phylogenies and hypotheses on the evolution of bile salt pathways. We determined the biliary bile-salt composition of 405 phylogenetically diverse bird species, including 7 paleognath species. Bile salt profiles were generally stable within bird families. Complex bile-salt profiles were more common in omnivores and herbivores than in carnivores. The structural variation of bile salts in birds is extensive and comparable to that seen in surveys of bile salts in reptiles and mammals. Birds produce many of the bile salts found throughout nonavian vertebrates and some previously uncharacterized bile salts. One difference between birds and other vertebrates is extensive hydroxylation of carbon-16 of bile salts in bird species. Comparison of our data set of bird bile salts with that of other vertebrates, especially reptiles, allowed us to infer evolutionary changes in the bile salt synthetic pathway.
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Affiliation(s)
- Lee R. Hagey
- Department of Medicine, University of California at San Diego, San Diego, California, 92093, USA
| | - Nicolas Vidal
- Département Systématique et Evolution, Muséum National d’Histoire Naturelle, Paris, France
| | - Alan F. Hofmann
- Department of Medicine, University of California at San Diego, San Diego, California, 92093, USA
| | - Matthew D. Krasowski
- Department of Pathology, University of Iowa Hospitals and Clinics, Iowa City, Iowa, 52242, USA
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