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Wang N, Chen L, Huang W, Gao Z, Jin M. Current Advances of Nanomaterial-Based Oral Drug Delivery for Colorectal Cancer Treatment. NANOMATERIALS (BASEL, SWITZERLAND) 2024; 14:557. [PMID: 38607092 PMCID: PMC11013305 DOI: 10.3390/nano14070557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2024] [Revised: 03/10/2024] [Accepted: 03/20/2024] [Indexed: 04/13/2024]
Abstract
Colorectal cancer (CRC) is a common malignant tumor, and traditional treatments include surgical resection and radiotherapy. However, local recurrence, distal metastasis, and intestinal obstruction are significant problems. Oral nano-formulation is a promising treatment strategy for CRC. This study introduces physiological and environmental factors, the main challenges of CRC treatment, and the need for a novel oral colon-targeted drug delivery system (OCDDS). This study reviews the research progress of controlled-release, responsive, magnetic, targeted, and other oral nano-formulations in the direction of CRC treatment, in addition to the advantages of oral colon-targeted nano-formulations and concerns about the oral delivery of related therapeutic agents to inspire related research.
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Affiliation(s)
- Nuoya Wang
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China; (N.W.); (L.C.); (W.H.)
- Beijing Key Laboratory of Drug Delivery Technology and Novel Formulations, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
- Department of Pharmacy, Yanbian University, Yanji 133000, China
| | - Liqing Chen
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China; (N.W.); (L.C.); (W.H.)
- Beijing Key Laboratory of Drug Delivery Technology and Novel Formulations, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Wei Huang
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China; (N.W.); (L.C.); (W.H.)
- Beijing Key Laboratory of Drug Delivery Technology and Novel Formulations, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Zhonggao Gao
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China; (N.W.); (L.C.); (W.H.)
- Beijing Key Laboratory of Drug Delivery Technology and Novel Formulations, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Mingji Jin
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China; (N.W.); (L.C.); (W.H.)
- Beijing Key Laboratory of Drug Delivery Technology and Novel Formulations, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
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Duncan SH, Conti E, Ricci L, Walker AW. Links between Diet, Intestinal Anaerobes, Microbial Metabolites and Health. Biomedicines 2023; 11:biomedicines11051338. [PMID: 37239009 DOI: 10.3390/biomedicines11051338] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Revised: 04/23/2023] [Accepted: 04/26/2023] [Indexed: 05/28/2023] Open
Abstract
A dense microbial community resides in the human colon, with considerable inter-individual variability in composition, although some species are relatively dominant and widespread in healthy individuals. In disease conditions, there is often a reduction in microbial diversity and perturbations in the composition of the microbiota. Dietary complex carbohydrates that reach the large intestine are important modulators of the composition of the microbiota and their primary metabolic outputs. Specialist gut bacteria may also transform plant phenolics to form a spectrum of products possessing antioxidant and anti-inflammatory activities. Consumption of diets high in animal protein and fat may lead to the formation of potentially deleterious microbial products, including nitroso compounds, hydrogen sulphide, and trimethylamine. Gut anaerobes also form a range of secondary metabolites, including polyketides that may possess antimicrobial activity and thus contribute to microbe-microbe interactions within the colon. The overall metabolic outputs of colonic microbes are derived from an intricate network of microbial metabolic pathways and interactions; however, much still needs to be learnt about the subtleties of these complex networks. In this review we consider the multi-faceted relationships between inter-individual microbiota variation, diet, and health.
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Affiliation(s)
- Sylvia H Duncan
- Rowett Institute, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD, Scotland, UK
| | - Elena Conti
- Rowett Institute, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD, Scotland, UK
| | - Liviana Ricci
- Rowett Institute, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD, Scotland, UK
| | - Alan W Walker
- Rowett Institute, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD, Scotland, UK
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Li Z, Shi J, Lei Y, Wu J, Zhang R, Zhang X, Jia L, Wang Y, Ma Y, He P, Ma Y, Cheng Q, Zhang Z, Zhang K, Lei Z. Castration alters the cecal microbiota and inhibits growth in Holstein cattle. J Anim Sci 2022; 100:skac367. [PMID: 36326798 PMCID: PMC9733532 DOI: 10.1093/jas/skac367] [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] [Received: 08/06/2022] [Accepted: 11/03/2022] [Indexed: 11/05/2022] Open
Abstract
To determine the effects of castration on growth performance, serum hormone levels, cecal microbiota composition, and metabolites in cattle. A total of 18 Holstein bulls and steers were divided into bull and steer groups and randomly assigned to 3 pens (3 cattle per pen, and each cattle were separated by a fence) to determine the average daily gain (ADG), daily dry matter intake (DMI), and feed efficiency (G/F). After the finishing trial, six cattle per group were randomly slaughtered. Serum was collected to measure the hormone concentration, and the cecal content was collected to measure the pH, short-chain fatty acids, and digestive enzyme activities. Metagenome sequencing and untargeted metabolomics were used to investigate the microbiota composition, functional profiles, and differential metabolites of the cecal contents. We found that castration significantly decreased ADG, DMI, and G/F in cattle (P < 0.05). The serum testosterone, thyroxine, growth hormone (P < 0.05), and triiodothyronine (P < 0.01) concentrations significantly decreased in the steer group when compared to those of the bull group. The activities of cellulase, xylanase, pectinase, and β-glucosidase (P < 0.05) significantly decreased in the steer group, whereas the activities of lipase and α-amylase significantly increased. Moreover, castration significantly decreased the relative abundance of Ruminococcaceae_bacterium, Treponema_porcinum, Oscillibacter_sp. (P < 0.05), and Alistipes_senegalensis (P < 0.01), whereas the relative abundance of Phocaeicola_plebeius (P < 0.05) was significantly increased. Also, the relative abundance of Phocaeicola_plebeius was negatively correlated with testosterone levels, and the function of the cecal microbiota was enriched in the GH29 and GH97 families in the steer group. Metabolomic analysis indicated that castration increased the levels of L-valine, L-phenylalanine, L-aspartic acid, L-isoleucine, L-lysine, methionine, L-glutamic acid, and L-leucine, while decreasing the levels of α-ketoglutaric acid through the 2-oxocarboxylic acid metabolism pathway. In addition, α-ketoglutaric acid was negatively correlated with Oscillibacter_sp. (P < 0.01). Overall, castration can inhibit cattle growth by altering the composition of the cecal microbiota. Therefore, this study provides a theoretical and practical basis for improving the growth performance of steers.
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Affiliation(s)
- Zemin Li
- College of Animal Science and Technology, Gansu Agricultural University, Lanzhou, China
| | - Jinping Shi
- College of Animal Science and Technology, Gansu Agricultural University, Lanzhou, China
| | - Yu Lei
- Key Laboratory of Animal Genetics, Breeding and Reproduction of Shaanxi Province, College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Jianping Wu
- Institute of Rural Development, Northwest Normal University, Lanzhou, China
| | - Rui Zhang
- College of Animal Science and Technology, Gansu Agricultural University, Lanzhou, China
| | - Xiao Zhang
- College of Animal Science and Technology, Gansu Agricultural University, Lanzhou, China
| | - Li Jia
- College of Animal Science and Technology, Gansu Agricultural University, Lanzhou, China
| | - Ying Wang
- College of Animal Science and Technology, Gansu Agricultural University, Lanzhou, China
| | - Yue Ma
- College of Animal Science and Technology, Gansu Agricultural University, Lanzhou, China
| | - Pengjia He
- College of Animal Science and Technology, Gansu Agricultural University, Lanzhou, China
| | - Yannan Ma
- Institute of Rural Development, Northwest Normal University, Lanzhou, China
| | - Qiang Cheng
- Jingchuan Xukang Food Co., Ltd, Pingliang, China
| | - Zhao Zhang
- Gansu Huarui Agriculture Co., Ltd, Zhangye, China
| | - Ke Zhang
- Key Laboratory of Animal Genetics, Breeding and Reproduction of Shaanxi Province, College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Zhaomin Lei
- College of Animal Science and Technology, Gansu Agricultural University, Lanzhou, China
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Cao Y, Aquino-Martinez R, Hutchison E, Allayee H, Lusis AJ, Rey FE. Role of gut microbe-derived metabolites in cardiometabolic diseases: Systems based approach. Mol Metab 2022; 64:101557. [PMID: 35870705 PMCID: PMC9399267 DOI: 10.1016/j.molmet.2022.101557] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 06/30/2022] [Accepted: 07/18/2022] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND The gut microbiome influences host physiology and cardiometabolic diseases by interacting directly with intestinal cells or by producing molecules that enter the host circulation. Given the large number of microbial species present in the gut and the numerous factors that influence gut bacterial composition, it has been challenging to understand the underlying biological mechanisms that modulate risk of cardiometabolic disease. SCOPE OF THE REVIEW Here we discuss a systems-based approach that involves simultaneously examining individuals in populations for gut microbiome composition, molecular traits using "omics" technologies, such as circulating metabolites quantified by mass spectrometry, and clinical traits. We summarize findings from landmark studies using this approach and discuss future applications. MAJOR CONCLUSIONS Population-based integrative approaches have identified a large number of microbe-derived or microbe-modified metabolites that are associated with cardiometabolic traits. The knowledge gained from these studies provide new opportunities for understanding the mechanisms involved in gut microbiome-host interactions and may have potentially important implications for developing novel therapeutic approaches.
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Affiliation(s)
- Yang Cao
- Departments of Medicine, Human Genetics, and Microbiology, Immunology, & Molecular Genetics, David Geffen School of Medicine of UCLA, Los Angeles, CA 90095, USA
| | - Ruben Aquino-Martinez
- Department of Bacteriology, University of Wisconsin, Madison, Madison, WI 53706, USA
| | - Evan Hutchison
- Department of Bacteriology, University of Wisconsin, Madison, Madison, WI 53706, USA
| | - Hooman Allayee
- Departments of Population & Public Health Sciences and Biochemistry & Molecular Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA
| | - Aldons J Lusis
- Departments of Medicine, Human Genetics, and Microbiology, Immunology, & Molecular Genetics, David Geffen School of Medicine of UCLA, Los Angeles, CA 90095, USA.
| | - Federico E Rey
- Department of Bacteriology, University of Wisconsin, Madison, Madison, WI 53706, USA
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5
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Wang X, Xu T, Zhang X, Zhao N, Hu L, Liu H, Zhang Q, Geng Y, Kang S, Xu S. The Response of Ruminal Microbiota and Metabolites to Different Dietary Protein Levels in Tibetan Sheep on the Qinghai-Tibetan Plateau. Front Vet Sci 2022; 9:922817. [PMID: 35847641 PMCID: PMC9277223 DOI: 10.3389/fvets.2022.922817] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Accepted: 05/31/2022] [Indexed: 11/13/2022] Open
Abstract
Ruminal microbiota and metabolites play crucial roles in animal health and productivity. Exploring the dynamic changes and interactions between microbial community composition and metabolites is important for understanding ruminal nutrition and metabolism. Tibetan sheep (Ovis aries) are an important livestock resource on the Qinghai-Tibetan Plateau (QTP), and the effects of various dietary protein levels on ruminal microbiota and metabolites are still unknown. The aim of this study was to investigate the response of ruminal microbiota and metabolites to different levels of dietary protein in Tibetan sheep. Three diets with different protein levels (low protein 10.1%, medium protein 12.1%, and high protein 14.1%) were fed to Tibetan sheep. 16S rRNA gene sequencing and gas chromatography coupled with time-of-flight mass spectrometry (GC-TOF-MS) were used to study the profile changes in each group of ruminal microbes and metabolites, as well as the potential interaction between them. The rumen microbiota in all groups was dominated by the phyla Bacteroidetes and Firmicutes regardless of the dietary protein level. At the genus level, Prevotella_1, Rikenellaceae_RC9_gut_group and Prevotellaceae_UCG-001 were dominant. Under the same forage-to-concentrate ratio condition, the difference in the dietary protein levels had no significant impact on the bacterial alpha diversity index and relative abundance of the major phyla and genera in Tibetan sheep. Rumen metabolomics analysis revealed that dietary protein levels altered the concentrations of ruminal amino acids, carbohydrates and organic acids, and significantly affected tryptophan metabolism (p < 0.05). Correlation analysis of the microbiota and metabolites revealed positive and negative regulatory mechanisms. Overall, this study provides detailed information on rumen microorganisms and ruminal metabolites under different levels of dietary protein, which could be helpful in subsequent research for regulating animal nutrition and metabolism through nutritional interventions.
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Affiliation(s)
- Xungang Wang
- Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China
| | - Tianwei Xu
- Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China
| | - Xiaoling Zhang
- Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Na Zhao
- Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China
| | - Linyong Hu
- Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China
| | - Hongjin Liu
- Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China
| | - Qian Zhang
- Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Yuanyue Geng
- Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Shengping Kang
- State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining, China
| | - Shixiao Xu
- Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China
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6
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Nano-Drug Delivery Systems Based on Different Targeting Mechanisms in the Targeted Therapy of Colorectal Cancer. Molecules 2022; 27:molecules27092981. [PMID: 35566331 PMCID: PMC9099628 DOI: 10.3390/molecules27092981] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 04/23/2022] [Accepted: 05/03/2022] [Indexed: 02/06/2023] Open
Abstract
Colorectal cancer (CRC) is a usual digestive tract malignancy and the third main cause of cancer death around the world, with a high occurrence rate and mortality rate. Conventional therapies for CRC have certain side effects and restrictions. However, the exciting thing is that with the rapid development of nanotechnology, nanoparticles have gradually become more valuable drug delivery systems than traditional therapies because of their capacity to control drug release and target CRC. This also promotes the application of nano-drug targeted delivery systems in the therapy of CRC. Moreover, to make nanoparticles have a better colon targeting effect, many approaches have been used, including nanoparticles targeting CRC and in response to environmental signals. In this review, we focus on various targeting mechanisms of CRC-targeted nanoparticles and their latest research progress in the last three years, hoping to give researchers some inspiration on the design of CRC-targeted nanoparticles.
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7
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Kroupina K, Bémeur C, Rose CF. Amino acids, ammonia, and hepatic encephalopathy. Anal Biochem 2022; 649:114696. [DOI: 10.1016/j.ab.2022.114696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 03/30/2022] [Accepted: 04/21/2022] [Indexed: 11/30/2022]
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8
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Shealy NG, Yoo W, Byndloss MX. Colonization resistance: metabolic warfare as a strategy against pathogenic Enterobacteriaceae. Curr Opin Microbiol 2021; 64:82-90. [PMID: 34688039 DOI: 10.1016/j.mib.2021.09.014] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Revised: 09/22/2021] [Accepted: 09/28/2021] [Indexed: 12/19/2022]
Abstract
The intestine is home to a large and complex bacterial ecosystem (microbiota), which performs multiple beneficial functions for the host, including immune education, nutrition, and protection against invasion by enteric pathogens (colonization resistance). The host and microbiome symbiotic interactions occur in part through metabolic crosstalk. Thus, microbiota members have evolved highly diverse metabolic pathways to inhibit pathogen colonization via activation of protective immune responses and nutrient acquisition and utilization. Conversely, pathogenic Enterobacteriaceae actively induce an inflammation-dependent disruption of the gut microbial ecosystem (dysbiosis) to gain a competitive metabolic advantage against the resident microbiota. This review discusses the recent findings on the crucial role of microbiota metabolites in colonization resistance regulation. Additionally, we summarize metabolic mechanisms used by pathogenic Enterobacteriaceae to outcompete commensal microbes and cause disease.
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Affiliation(s)
- Nicolas G Shealy
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Woongjae Yoo
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Mariana X Byndloss
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, USA; Vanderbilt Institute for Infection, Immunology, and Inflammation, Vanderbilt University Medical Center, Nashville, TN, USA.
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9
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Al-Essa MK, Alzayadneh E, Al-Hadidi K. Assessment of Proteolysis by Pyrylium and Other Fluorogenic Reagents. Protein Pept Lett 2021; 28:809-816. [PMID: 33390107 PMCID: PMC9175085 DOI: 10.2174/0929866528999201231214954] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 11/04/2020] [Accepted: 11/09/2020] [Indexed: 11/22/2022]
Abstract
Aims We aim to evaluate the potential application of amine reactive fluorogenic reagents for estimating enzymatic proteolysis. Background Proteolytic enzymes play important roles in regulating many physiological processes in living organisms. Objectives
Assessment of protein degradation by using reagents for protein assay techniques. Methods We have assayed samples at the start and after 30-60 minutes incubation with trypsin by Chromeo P503 (Py 1 pyrylium compound) and CBQCA (3-(4-carboxybenzoyl) quinoline-2-carboxaldehyde) as amine reactive reagents and NanoOrange as non-amine reactive dye. Results All BSA prepared samples with trypsin have shown significantly higher fluorescence intensity (FI) versus controls (which reflects proteolysis) when assayed by Chromeo P503 (Py 1 pyrylium compound) and CBQCA (3-(4-carboxybenzoyl) quinoline-2-carboxaldehyde) as amine reactive reagents. However, same samples assayed with NanoOrange as non-amine reactive reagent did not show any significant variation between samples containing trypsin and controls. Conclusion These results are confirming reliability of highly sensitive protein assays utilizing amine reactive fluorogenic reagents for general estimation of proteolysis.
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Affiliation(s)
- Mohamed K Al-Essa
- Department of Physiology and Biochemistry, School of Medicine, The University of Jordan, Amman 11942, Jordan
| | - Ebaa Alzayadneh
- Department of Physiology and Biochemistry, School of Medicine, The University of Jordan, Amman 11942, Jordan
| | - Kamal Al-Hadidi
- Department of Pathology, Microbiology and Forensic Medicine, School of Medicine, The University of Jordan, Amman 11942, Jordan
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10
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Qin X. High Fecal Proteolytic Activity That Precedes Ulcerative Colitis Likely Results From Impaired Inactivation of Pancreatic Proteases Rather Than Bacteria. Inflamm Bowel Dis 2021; 27:e104. [PMID: 34125213 DOI: 10.1093/ibd/izab142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
Affiliation(s)
- Xiaofa Qin
- GI Biopharma Inc., Westfield, New Jersey, USA
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11
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Hou JJ, Wang X, Li Y, Su S, Wang YM, Wang BM. The relationship between gut microbiota and proteolytic activity in irritable bowel syndrome. Microb Pathog 2021; 157:104995. [PMID: 34048892 DOI: 10.1016/j.micpath.2021.104995] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Revised: 05/05/2021] [Accepted: 05/05/2021] [Indexed: 02/08/2023]
Abstract
Irritable bowel syndrome (IBS) is a common functional gastrointestinal disease that affects 3.8-9.2% of the world population. It affects the physiology and psychology of patients and increases the burden on families, the healthcare system, society, and economic development. Presently, a large number of studies have shown that compared to healthy individuals, the composition and diversity of gut microbiota in IBS patients have changed, and the proteolytic activity (PA) in fecal supernatant and colonic mucosa of IBS patients has also increased. These findings indicate that the imbalance of intestinal microecology and intestinal protein hydrolysis is closely related to IBS. Furthermore, the intestinal flora is a key substance that regulates the PA and is associated with IBS. The current review described the intestinal microecology and intestinal proteolytic activity of patients with IBS and also discussed the effect of intestinal flora on PA. In summary, this study proposed a pivotal role of gut microbiota and PA in IBS, respectively, and provided an in-depth insight into the diagnosis and treatment targets of IBS as well as the formulation of new treatment strategies for other digestive diseases and protease-related diseases.
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Affiliation(s)
- Jun-Jie Hou
- Department of Gastroenterology and Hepatology, Tianjin Medical University General Hospital, Tianjin, PR China.
| | - Xin Wang
- Department of Gastroenterology and Hepatology, Tianjin Medical University General Hospital, Tianjin, PR China.
| | - Ying Li
- Department of Gastroenterology and Hepatology, Tianjin Medical University General Hospital, Tianjin, PR China.
| | - Shuai Su
- Department of Gastroenterology and Hepatology, Tianjin Medical University General Hospital, Tianjin, PR China.
| | - Yu-Ming Wang
- Department of Gastroenterology and Hepatology, Tianjin Medical University General Hospital, Tianjin, PR China.
| | - Bang-Mao Wang
- Department of Gastroenterology and Hepatology, Tianjin Medical University General Hospital, Tianjin, PR China.
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Kõiv V, Tenson T. Gluten-degrading bacteria: availability and applications. Appl Microbiol Biotechnol 2021; 105:3045-3059. [PMID: 33837830 PMCID: PMC8053163 DOI: 10.1007/s00253-021-11263-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Revised: 03/18/2021] [Accepted: 03/31/2021] [Indexed: 12/11/2022]
Abstract
Gluten is a mixture of storage proteins in wheat and occurs in smaller amounts in other cereal grains. It provides favorable structure to bakery products but unfortunately causes disease conditions with increasing prevalence. In the human gastrointestinal tract, gluten is cleaved into proline and gluten rich peptides that are not degraded further. These peptides trigger immune responses that might lead to celiac disease, wheat allergy, and non-celiac gluten sensitivity. The main treatment option is a gluten-free diet. Alternatively, using enzymes or microorganisms with gluten-degrading properties might alleviate the disease. These components can be used during food production or could be introduced into the digestive tract as food supplements. In addition, natural food from the environment is known to enrich the microbial communities in gut and natural environmental microbial communities have high potential to degrade gluten. It remains to be investigated if food and environment-induced changes in the gut microbiome could contribute to the triggering of gluten-related diseases. KEY POINTS: • Wheat proteins, gluten, are incompletely digested in human digestive tract leading to gluten intolerance. • The only efficient treatment of gluten intolerance is life-long gluten-free diet. • Environmental bacteria acquired together with food could be source of gluten-degrading bacteria detoxifying undigested gluten peptides.
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Affiliation(s)
- Viia Kõiv
- Institute of Technology, University of Tartu, Tartu, Estonia.
| | - Tanel Tenson
- Institute of Technology, University of Tartu, Tartu, Estonia
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13
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Rysz J, Franczyk B, Ławiński J, Olszewski R, Ciałkowska-Rysz A, Gluba-Brzózka A. The Impact of CKD on Uremic Toxins and Gut Microbiota. Toxins (Basel) 2021; 13:toxins13040252. [PMID: 33807343 PMCID: PMC8067083 DOI: 10.3390/toxins13040252] [Citation(s) in RCA: 97] [Impact Index Per Article: 32.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 03/23/2021] [Accepted: 03/28/2021] [Indexed: 12/11/2022] Open
Abstract
Numerous studies have indicated that the progression of chronic kidney disease (CKD) to end-stage renal disease (ESRD) is strictly associated with the accumulation of toxic metabolites in blood and other metabolic compartments. This accumulation was suggested to be related to enhanced generation of toxins from the dysbiotic microbiome accompanied by their reduced elimination by impaired kidneys. Intestinal microbiota play a key role in the accumulation of uremic toxins due to the fact that numerous uremic solutes are generated in the process of protein fermentation by colonic microbiota. Some disease states, including CKD, are associated with the presence of dysbiosis, which can be defined as an "imbalanced intestinal microbial community with quantitative and qualitative changes in the composition and metabolic activities of the gut microbiota". The results of studies have confirmed the altered composition and functions of gut microbial community in chronic kidney disease. In the course of CKD protein-bound uremic toxins, including indoxyl sulfate, p-cresyl glucuronide, p-cresyl sulfate and indole-3-acetic acid are progressively accumulated. The presence of chronic kidney disease may be accompanied by the development of intestinal inflammation and epithelial barrier impairment leading to hastened systemic translocation of bacterial-derived uremic toxins and consequent oxidative stress injury to the kidney, cardiovascular and endocrine systems. These findings offer new therapeutic possibilities for the management of uremia, inflammation and kidney disease progression and the prevention of adverse outcomes in CKD patients. It seems that dietary interventions comprising prebiotics, probiotics, and synbiotics could pose a promising strategy in the management of uremic toxins in CKD.
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Affiliation(s)
- Jacek Rysz
- Department of Nephrology, Hypertension and Family Medicine, Medical University of Lodz, 90-549 Lodz, Poland; (J.R.); (B.F.)
| | - Beata Franczyk
- Department of Nephrology, Hypertension and Family Medicine, Medical University of Lodz, 90-549 Lodz, Poland; (J.R.); (B.F.)
| | - Janusz Ławiński
- Department of Urology, Institute of Medical Sciences, Medical College of Rzeszow University, 35-055 Rzeszow, Poland;
| | - Robert Olszewski
- Department of Gerontology, Public Health and Didactics, Rheumatology and Rehabilitation, National Institute of Geriatrics, 02-637 Warsaw, Poland;
- Department of Ultrasound, Institute of Fundamental Technological Research, Polish Academy of Sciences, 02-637 Warsaw, Poland
| | | | - Anna Gluba-Brzózka
- Department of Nephrology, Hypertension and Family Medicine, Medical University of Lodz, 90-549 Lodz, Poland; (J.R.); (B.F.)
- Correspondence: ; Tel.: +48-42-6393750
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Albracht-Schulte K, Islam T, Johnson P, Moustaid-Moussa N. Systematic Review of Beef Protein Effects on Gut Microbiota: Implications for Health. Adv Nutr 2021; 12:102-114. [PMID: 32761179 PMCID: PMC7850003 DOI: 10.1093/advances/nmaa085] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 05/10/2020] [Accepted: 06/24/2020] [Indexed: 01/07/2023] Open
Abstract
The influence of diet on the gut microbiota is an emerging research area with significant impact on human health and disease. However, the effects of beef, the most consumed red meat in the United States, on gut microbial profile are not well studied. Following Preferred Reporting Items for Systematic Review and Meta-Analysis Protocols, the objective of this systematic review was to conduct a rigorous and thorough review of the current scientific literature regarding the effects of beef protein and the resulting bioactivity of beef protein and amino acids on the gut microbiota, with the goal of identifying gaps in the literature and guiding future research priorities. Utilizing MEDLINE Complete, PubMed, ScienceDirect, Scopus, and Google Scholar databases, we conducted searches including terms and combinations of the following: animal protein, amino acid, beef, bioactive compounds, diet, health, microbiome, peptide, processed beef, and protein. We identified 131 articles, from which 15 were included in our review. The effects of beef on mouse and rat models were mostly consistent for the bacterial phylum level. Short-term (1-4-wk) beef intakes had little to no effect on microbial profiles in humans. Most studies utilized high beef feeding (240-380 g/d), and no study examined recommended amounts of protein [∼3.71 oz/d (105 g/d) meats, poultry, and eggs, or ∼26 oz/week (737 g/wk) from these food sources] according to US dietary guidelines. Additionally, the majority of animal and human studies with adverse findings examined the impact of beef in the context of a diet high in fat or sugar. In conclusion, an extensive gap exists in the literature regarding beef and the microbiota. More studies are necessary to elucidate the role of the microbiota following the consumption of beef, especially in interaction with other dietary compounds, and how beef preparation, processing, and cooking methods differentially influence the biological effects of beef on human health.
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Affiliation(s)
- Kembra Albracht-Schulte
- Department of Nutritional Sciences and Obesity Research Institute, Texas Tech University, Lubbock, TX, USA
| | - Tariful Islam
- Department of Nutritional Sciences and Obesity Research Institute, Texas Tech University, Lubbock, TX, USA
| | - Paige Johnson
- Department of Nutritional Sciences and Obesity Research Institute, Texas Tech University, Lubbock, TX, USA
| | - Naima Moustaid-Moussa
- Department of Nutritional Sciences and Obesity Research Institute, Texas Tech University, Lubbock, TX, USA
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15
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Anania G, Davies RJ, Arezzo A, Bagolini F, D’Andrea V, Graziosi L, Di Saverio S, Popivanov G, Cheruiyot I, Cirocchi R, Donini A. Rise and fall of total mesorectal excision with lateral pelvic lymphadenectomy for rectal cancer: an updated systematic review and meta-analysis of 11,366 patients. Int J Colorectal Dis 2021; 36:2321-2333. [PMID: 34125269 PMCID: PMC8505280 DOI: 10.1007/s00384-021-03946-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 04/26/2021] [Indexed: 02/04/2023]
Abstract
UNLABELLED The role of lateral lymph node dissection (LLND) during total mesorectal excision (TME) for rectal cancer is still controversial. Many reviews were published on prophylactic LLND in rectal cancer surgery, some biased by heterogeneity of overall associated treatments. The aim of this systematic review and meta-analysis is to perform a timeline analysis of different treatments associated to prophylactic LLND vs no-LLND during TME for rectal cancer. METHODS A literature search was performed in PubMed, SCOPUS and WOS for publications up to 1 September 2020. We considered RCTs and CCTs comparing oncologic and functional outcomes of TME with or without LLND in patients with rectal cancer. RESULTS Thirty-four included articles and 29 studies enrolled 11,606 patients. No difference in 5-year local recurrence (in every subgroup analysis including preoperative neoadjuvant chemoradiotherapy), 5-year distant and overall recurrence, 5-year overall survival and 5-year disease-free survival was found between LLND group and non LLND group. The analysis of post-operative functional outcomes reported hindered quality of life (urinary, evacuatory and sexual dysfunction) in LLND patients when compared to non LLND. CONCLUSION Our publication does not demonstrate that TME with LLND has any oncological advantage when compared to TME alone, showing that with the advent of neoadjuvant therapy, the advantage of LLND is lost. In this review, the most important bias is the heterogeneous characteristics of patients, cancer staging, different neoadjuvant therapy, different radiotherapy techniques and fractionation used in different studies. Higher rate of functional post-operative complications does not support routinely use of LLND.
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Affiliation(s)
- Gabriele Anania
- Dipartimento di Scienze Mediche, Università degli Studi di Ferrara, Ferrara, Italy
| | - Richard Justin Davies
- Cambridge Colorectal Unit - Addenbrooke’s Hospital, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK
| | - Alberto Arezzo
- Department of Surgical Sciences, University of Torino, Corso Dogliotti 14, 10126 Torino, Italy
| | - Francesco Bagolini
- Dipartimento di Scienze Mediche, Università degli Studi di Ferrara, Ferrara, Italy
| | - Vito D’Andrea
- Department of Surgical Sciences, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy
| | - Luigina Graziosi
- Department of Surgery and Biomedical Sciences, University of Perugia, 06121 Perugia, Italy
| | - Salomone Di Saverio
- Department of General Surgery (S.D.S., G.I., E.Z., G.C.), University of Insubria, University Hospital of Varese, ASST Sette Laghi, Regione Lombardia, Italy
| | - Georgi Popivanov
- Department of Surgery, Military Medical Academy, ul. “Sv. Georgi Sofiyski” 3, 1606 Sofia, Bulgaria
| | - Isaac Cheruiyot
- Department of Human Anatomy, University of Nairobi, Nairobi, Kenya
| | - Roberto Cirocchi
- Department of Surgery and Biomedical Sciences, University of Perugia, 06121 Perugia, Italy
| | - Annibale Donini
- Department of Surgery and Biomedical Sciences, University of Perugia, 06121 Perugia, Italy
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Zhao Y, Tian G, Chen D, Zheng P, Yu J, He J, Mao X, Huang Z, Luo Y, Luo J, Yu B. Dietary protein levels and amino acid supplementation patterns alter the composition and functions of colonic microbiota in pigs. ACTA ACUST UNITED AC 2020; 6:143-151. [PMID: 32542194 PMCID: PMC7283365 DOI: 10.1016/j.aninu.2020.02.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Revised: 01/04/2020] [Accepted: 02/20/2020] [Indexed: 12/11/2022]
Abstract
Different dietary nitrogen (N) patterns may have different effects on gut microbiota. To investigate the effects of different crude protein (CP) levels or essential amino acids (EAA) supplementation patterns on the structure and functions of colonic microbiota, 42 barrows (25 ± 0.39 kg) were randomly assigned to 7 dietary treatments including: diet 1, a high CP diet with balanced 10 EAA; diet 2, a medium CP diet with approximately 2% decreased CP level from diet 1 and balanced 10 EAA; diets 3, 4, 5, 6 and 7, low CP diets with 4% decreased CP level from diet 1. Specifically, diet 3 was only balanced for Lys, Met, Thr and Trp; diets 4, 5 and 6 were further supplemented with Ile, Val and Ile + Val on the basis of diet 3, respectively; and diet 7 was balanced for 10 EAA. Results over a 110-d trial showed that reducing the CP level by 2% or 4% dramatically decreased N intake and excretion (P < 0.05) in the presence of balanced 10 EAA, which was not observed when altering the EAA supplementation patterns in low CP diet (−4%). With balanced 10 EAA, 2% reduction in dietary CP significantly reduced Firmicutes-to-Bacteroidetes (F:B) ratio and significantly elevated the abundance of Prevotellaceae NK3B31 (P < 0.05); whereas 4% reduction evidently increased the abundances of Proteobacteria, Succinivibrio and Lachnospiraceae XPB1014 (P < 0.05). Among the 5 low CP diets (−4%), supplementation with Ile, or Val + Ile, or balanced 10 EAA increased F:B ratio and the abundance of Proteobacteria. In addition, the predicted functions revealed that different CP levels and EAA balanced patterns dramatically altered the mRNA expression profiles of N-metabolizing genes, the “N and energy metabolism” pathways or the metabolism of some small substances, such as amino acids (AA) and vitamins. Our findings suggested that reducing the dietary CP levels by 2% to 4% with balancing 10 EAA, or only further supplementation with Ile or Val + Ile to a low protein diet (−4%) reduced the N contents entering the hindgut to various degrees, altered the abundances of N-metabolizing bacteria, and improved the abilities of N utilization.
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Affiliation(s)
- Yumei Zhao
- Key Laboratory of Animal Disease-Resistance Nutrition, Animal Nutrition Institute, Sichuan Agricultural University, Ya'an 625014, China
| | - Gang Tian
- Key Laboratory of Animal Disease-Resistance Nutrition, Animal Nutrition Institute, Sichuan Agricultural University, Ya'an 625014, China
| | - Daiwen Chen
- Key Laboratory of Animal Disease-Resistance Nutrition, Animal Nutrition Institute, Sichuan Agricultural University, Ya'an 625014, China
| | - Ping Zheng
- Key Laboratory of Animal Disease-Resistance Nutrition, Animal Nutrition Institute, Sichuan Agricultural University, Ya'an 625014, China
| | - Jie Yu
- Key Laboratory of Animal Disease-Resistance Nutrition, Animal Nutrition Institute, Sichuan Agricultural University, Ya'an 625014, China
| | - Jun He
- Key Laboratory of Animal Disease-Resistance Nutrition, Animal Nutrition Institute, Sichuan Agricultural University, Ya'an 625014, China
| | - Xiangbing Mao
- Key Laboratory of Animal Disease-Resistance Nutrition, Animal Nutrition Institute, Sichuan Agricultural University, Ya'an 625014, China
| | - Zhiqing Huang
- Key Laboratory of Animal Disease-Resistance Nutrition, Animal Nutrition Institute, Sichuan Agricultural University, Ya'an 625014, China
| | - Yuheng Luo
- Key Laboratory of Animal Disease-Resistance Nutrition, Animal Nutrition Institute, Sichuan Agricultural University, Ya'an 625014, China
| | - Junqiu Luo
- Key Laboratory of Animal Disease-Resistance Nutrition, Animal Nutrition Institute, Sichuan Agricultural University, Ya'an 625014, China
| | - Bing Yu
- Key Laboratory of Animal Disease-Resistance Nutrition, Animal Nutrition Institute, Sichuan Agricultural University, Ya'an 625014, China
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Edogawa S, Edwinson AL, Peters SA, Chikkamenahalli LL, Sundt WJ, Graves S, Gurunathan SV, Breen-Lyles MK, Johnson S, Dyer RB, Graham RP, Chen J, Kashyap P, Farrugia G, Grover M. Serine proteases as luminal mediators of intestinal barrier dysfunction and symptom severity in IBS. Gut 2020; 69:62-73. [PMID: 30923071 PMCID: PMC6765451 DOI: 10.1136/gutjnl-2018-317416] [Citation(s) in RCA: 53] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Revised: 03/13/2019] [Accepted: 03/16/2019] [Indexed: 12/19/2022]
Abstract
OBJECTIVE The intestinal lumen contains several proteases. Our aim was to determine the role of faecal proteases in mediating barrier dysfunction and symptoms in IBS. DESIGN 39 patients with IBS and 25 healthy volunteers completed questionnaires, assessments of in vivo permeability, ex vivo colonic barrier function in Ussing chambers, tight junction (TJ) proteins, ultrastructural morphology and 16 s sequencing of faecal microbiota rRNA. A casein-based assay was used to measure proteolytic activity (PA) in faecal supernatants (FSNs). Colonic barrier function was determined in mice (ex-germ free) humanised with microbial communities associated with different human PA states. RESULTS Patients with IBS had higher faecal PA than healthy volunteers. 8/20 postinfection IBS (PI-IBS) and 3/19 constipation- predominant IBS had high PA (>95th percentile). High-PA patients had more and looser bowel movements, greater symptom severity and higher in vivo and ex vivo colonic permeability. High-PA FSNs increased paracellular permeability, decreased occludin and increased phosphorylated myosin light chain (pMLC) expression. Serine but not cysteine protease inhibitor significantly blocked high-PA FSN effects on barrier. The effects on barrier were diminished by pharmacological or siRNA inhibition of protease activated receptor-2 (PAR-2). Patients with high-PA IBS had lower occludin expression, wider TJs on biopsies and reduced microbial diversity than patients with low PA. Mice humanised with high-PA IBS microbiota had greater in vivo permeability than those with low-PA microbiota. CONCLUSION A subset of patients with IBS, especially in PI-IBS, has substantially high faecal PA, greater symptoms, impaired barrier and reduced microbial diversity. Commensal microbiota affects luminal PA that can influence host barrier function.
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Affiliation(s)
- Shoko Edogawa
- Division of Gastroenterology & Hepatology, Mayo Clinic, Rochester, MN, USA
| | - Adam L Edwinson
- Division of Gastroenterology & Hepatology, Mayo Clinic, Rochester, MN, USA
| | - Stephanie A Peters
- Division of Gastroenterology & Hepatology, Mayo Clinic, Rochester, MN, USA
| | | | - Wendy J Sundt
- Division of Gastroenterology & Hepatology, Mayo Clinic, Rochester, MN, USA
| | - Sara Graves
- Division of Gastroenterology & Hepatology, Mayo Clinic, Rochester, MN, USA
| | | | | | - Stephen Johnson
- Division of Biomedical Statistics and Informatics and Center for Individualized Medicine, Mayo Clinic, Rochester, MN, USA
| | - Roy B Dyer
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
| | - Rondell P. Graham
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
| | - Jun Chen
- Division of Biomedical Statistics and Informatics and Center for Individualized Medicine, Mayo Clinic, Rochester, MN, USA
| | - Purna Kashyap
- Division of Gastroenterology & Hepatology, Mayo Clinic, Rochester, MN, USA
| | - Gianrico Farrugia
- Division of Gastroenterology & Hepatology, Mayo Clinic, Jacksonville, FL, USA
| | - Madhusudan Grover
- Division of Gastroenterology & Hepatology, Mayo Clinic, Rochester, MN, USA,Correspondence: Madhusudan Grover, MD, Assistant Professor of Medicine and Physiology, Enteric NeuroScience Program, Division of Gastroenterology and Hepatology, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA, Tel: 507-284-2478, Fax: 507-266-0350,
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18
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Chiofalo B, De Vita G, Lo Presti V, Cucinotta S, Gaglio G, Leone F, Di Rosa AR. Grain free diets for utility dogs during training work: Evaluation of the nutrient digestibility and faecal characteristics. ACTA ACUST UNITED AC 2019; 5:297-306. [PMID: 31528733 PMCID: PMC6737487 DOI: 10.1016/j.aninu.2019.05.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Revised: 04/24/2019] [Accepted: 05/07/2019] [Indexed: 01/08/2023]
Abstract
Two different diets characterized by the absence of cereals or by the presence of conventional cereals were evaluated on the nutrient digestibility and faecal characteristics and faecal fermentative end-product concentrations of 8 neutered adult Labrador retrievers housed at the Regional Centre Helen Keller (Messina, Italy) during the training work for the service guide for the blind. Dogs (age = 17 ± 1 months, initial body weight [BW] = 26.3 ± 1 kg, and body condition score [BCS] = 4.5 ± 0.11) were divided into 2 homogeneous groups for sex (half males and half females). Dogs in the grain free (GF) group were fed a commercial diet characterized by the absence of grain cereals, and dogs in the control (CTR) group were fed a super-premium pet food characterized by conventional grains as the carbohydrate source. The trial lasted 84 d, preceded by a 7-d of adaption period. Physical examination, digestibility, and faecal characteristics were studied. The statistical model included the effects of diet (GF vs. CTR), time (from d 0 to 84, end of the trial) and the interaction (diet × time). The high-protein, low-carbohydrate dry diet (GF) offered higher apparent nutrient digestibility of protein (+10%; P = 0.002) and fat (+7%; P < 0.001) and more stable large intestinal fermentation of carbohydrate compared to the commercial high-carbohydrate dry diet, enabling dogs to use nutrients from the diet more efficiently and thus requiring less food (-13%) to satisfy their nutrient requirements, producing less excrement (-33%; P = 0.033), and reaching a higher final BW (+8%; P < 0.0001) and a higher final BCS (+15%; P = 0.003). Therefore, the GF diet appears the nutritional plan most suitable for these animals taking due account not only of the training work done by animals with their increased nutrient and energy needs, but also of the gastrointestinal disorders consequent to stress coming from work and life in kennels, which cause in the Labrador retrievers an unusual weight loss.
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Affiliation(s)
- Biagina Chiofalo
- Department of Veterinary Sciences, University of Messina, Polo Universitario Annunziata, Messina, 98168, Italy
| | - Giulia De Vita
- Department of Veterinary Sciences, University of Messina, Polo Universitario Annunziata, Messina, 98168, Italy
| | - Vittorio Lo Presti
- Department of Veterinary Sciences, University of Messina, Polo Universitario Annunziata, Messina, 98168, Italy
| | - Salvatore Cucinotta
- Department of Veterinary Sciences, University of Messina, Polo Universitario Annunziata, Messina, 98168, Italy
| | - Gabriella Gaglio
- Department of Veterinary Sciences, University of Messina, Polo Universitario Annunziata, Messina, 98168, Italy
| | - Francesco Leone
- Department of Veterinary Sciences, University of Messina, Polo Universitario Annunziata, Messina, 98168, Italy
| | - Ambra R Di Rosa
- Department of Veterinary Sciences, University of Messina, Polo Universitario Annunziata, Messina, 98168, Italy
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19
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Xu JH, Jiang Z, Solania A, Chatterjee S, Suzuki B, Lietz CB, Hook VYH, O’Donoghue AJ, Wolan DW. A Commensal Dipeptidyl Aminopeptidase with Specificity for N-Terminal Glycine Degrades Human-Produced Antimicrobial Peptides in Vitro. ACS Chem Biol 2018; 13:2513-2521. [PMID: 30085657 DOI: 10.1021/acschembio.8b00420] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Proteases within the C1B hydrolase family are encoded by many organisms. We subjected a putative C1B-like cysteine protease secreted by the human gut commensal Parabacteroides distasonis to mass spectrometry-based substrate profiling to find preferred peptide substrates. The P. distasonis protease, which we termed Pd_dinase, has a sequential diaminopeptidase activity with strong specificity for N-terminal glycine residues. Using the substrate sequence information, we verified the importance of the P2 glycine residue with a panel of fluorogenic substrates and calculated kcat and KM for the dipeptide glycine-arginine-AMC. A potent and irreversible dipeptide inhibitor with a C-terminal acyloxymethyl ketone warhead, glycine-arginine- AOMK, was then synthesized and demonstrated that the Pd_dinase active site requires a free N-terminal amine for potent and rapid inhibition. We next determined the homohexameric Pd_dinase structure in complex with glycine-arginine- AOMK and uncovered unexpected active site features that govern the strict substrate preferences and differentiate this protease from members of the C1B and broader papain-like C1 protease families. We finally showed that Pd_dinase hydrolyzes several human antimicrobial peptides and therefore posit that this P. distasonis enzyme may be secreted into the extracellular milieu to assist in gut colonization by inactivation of host antimicrobial peptides.
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Affiliation(s)
- Janice H. Xu
- Department of Molecular Medicine, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Zhenze Jiang
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
| | - Angelo Solania
- Department of Molecular Medicine, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Sandip Chatterjee
- Department of Molecular Medicine, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Brian Suzuki
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
| | - Christopher B. Lietz
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
| | - Vivian Y. H. Hook
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
| | - Anthony J. O’Donoghue
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
| | - Dennis W. Wolan
- Department of Molecular Medicine, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
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20
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Metatranscriptome analysis of the microbial fermentation of dietary milk proteins in the murine gut. PLoS One 2018; 13:e0194066. [PMID: 29664912 PMCID: PMC5903625 DOI: 10.1371/journal.pone.0194066] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Accepted: 02/23/2018] [Indexed: 01/22/2023] Open
Abstract
Undigestible food ingredients are converted by the microbiota into a large range of metabolites, predominated by short chain fatty acids (SCFA). These microbial metabolites are subsequently available for absorption by the host mucosa and can serve as an energy source. Amino acids fermentation by the microbiota expands the spectrum of fermentation end-products beyond acetate, propionate and butyrate, to include in particular branched-SCFA. Here the long-term effects of high protein-diets on microbial community composition and functionality in mice were analyzed. Determinations of the microbiota composition using phylogenetic microarray (MITChip) technology were complemented with metatranscriptome and SCFA analyses to obtain insight in in situ expression of protein fermentation pathways and the phylogenetic groups involved. High protein diets led to increased luminal concentrations of branched-SCFA, in accordance with protein fermentation in the gut. Bacteria dominantly participating in protein catabolism belonged to the Lachnospiraceae, Erysipelotrichaceae and Clostridiaceae families in both normal- and high- protein diet regimes. This study identifies the microbial groups involved in protein catabolism in the intestine and underpins the value of in situ metatranscriptome analyses as an approach to decipher locally active metabolic networks and pathways as a function of the dietary regime, as well as the phylogeny of the microorganisms executing them.
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21
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Sircana A, De Michieli F, Parente R, Framarin L, Leone N, Berrutti M, Paschetta E, Bongiovanni D, Musso G. Gut microbiota, hypertension and chronic kidney disease: Recent advances. Pharmacol Res 2018; 144:390-408. [PMID: 29378252 DOI: 10.1016/j.phrs.2018.01.013] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Revised: 12/29/2017] [Accepted: 01/22/2018] [Indexed: 02/07/2023]
Abstract
A large number of different microbial species populates intestine. Extensive research has studied the entire microbial population and their genes (microbiome) by using metagenomics, metatranscriptomics and metabolomic analysis. Studies suggest that the imbalances of the microbial community causes alterations in the intestinal homeostasis, leading to repercussions on other systems: metabolic, nervous, cardiovascular, immune. These studies have also shown that alterations in the structure and function of the gut microbiota play a key role in the pathogenesis and complications of Hypertension (HTN) and Chronic Kidney Disease (CKD). Increased blood pressure (BP) and CKD are two leading risk factors for cardiovascular disease and their treatment represents a challenge for the clinicians. In this Review, we discuss mechanisms whereby gut microbiota (GM) and its metabolites act on downstream cellular targets to contribute to the pathogenesis of HTN and CKD, and potential therapeutic implications.
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Affiliation(s)
- Antonio Sircana
- Unità Operativa di Cardiologia, Azienda Ospedaliero Universitaria, Sassari, Italy; Department of Medical Sciences, San Giovanni Battista Hospital, Turin, Italy
| | - Franco De Michieli
- HUMANITAS Gradenigo, University of Turin, Turin, Italy; Department of Medical Sciences, San Giovanni Battista Hospital, Turin, Italy
| | - Renato Parente
- HUMANITAS Gradenigo, University of Turin, Turin, Italy; Department of Medical Sciences, San Giovanni Battista Hospital, Turin, Italy
| | - Luciana Framarin
- HUMANITAS Gradenigo, University of Turin, Turin, Italy; Department of Medical Sciences, San Giovanni Battista Hospital, Turin, Italy
| | - Nicola Leone
- HUMANITAS Gradenigo, University of Turin, Turin, Italy; Department of Medical Sciences, San Giovanni Battista Hospital, Turin, Italy
| | - Mara Berrutti
- HUMANITAS Gradenigo, University of Turin, Turin, Italy; Department of Medical Sciences, San Giovanni Battista Hospital, Turin, Italy
| | - Elena Paschetta
- HUMANITAS Gradenigo, University of Turin, Turin, Italy; Department of Medical Sciences, San Giovanni Battista Hospital, Turin, Italy
| | - Daria Bongiovanni
- HUMANITAS Gradenigo, University of Turin, Turin, Italy; Department of Medical Sciences, San Giovanni Battista Hospital, Turin, Italy
| | - Giovanni Musso
- HUMANITAS Gradenigo, University of Turin, Turin, Italy; Department of Medical Sciences, San Giovanni Battista Hospital, Turin, Italy.
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22
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Yadav M, Verma MK, Chauhan NS. A review of metabolic potential of human gut microbiome in human nutrition. Arch Microbiol 2017; 200:203-217. [PMID: 29188341 DOI: 10.1007/s00203-017-1459-x] [Citation(s) in RCA: 122] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2017] [Revised: 10/30/2017] [Accepted: 11/16/2017] [Indexed: 02/06/2023]
Abstract
The human gut contains a plethora of microbes, providing a platform for metabolic interaction between the host and microbiota. Metabolites produced by the gut microbiota act as a link between gut microbiota and its host. These metabolites act as messengers having the capacity to alter the gut microbiota. Recent advances in the characterization of the gut microbiota and its symbiotic relationship with the host have provided a platform to decode metabolic interactions. The human gut microbiota, a crucial component for dietary metabolism, is shaped by the genetic, epigenetic and dietary factors. The metabolic potential of gut microbiota explains its significance in host health and diseases. The knowledge of interactions between microbiota and host metabolism, as well as modification of microbial ecology, is really beneficial to have effective therapeutic treatments for many diet-related diseases in near future. This review cumulates the information to map the role of human gut microbiota in dietary component metabolism, the role of gut microbes derived metabolites in human health and host-microbe metabolic interactions in health and diseases.
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Affiliation(s)
- Monika Yadav
- Department of Biochemistry, Maharshi Dayanand University, Rohtak, Haryana, 124001, India
| | - Manoj Kumar Verma
- Department of Biochemistry, Maharshi Dayanand University, Rohtak, Haryana, 124001, India
| | - Nar Singh Chauhan
- Department of Biochemistry, Maharshi Dayanand University, Rohtak, Haryana, 124001, India.
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23
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van der Wielen N, Moughan PJ, Mensink M. Amino Acid Absorption in the Large Intestine of Humans and Porcine Models. J Nutr 2017; 147:1493-1498. [PMID: 28615378 DOI: 10.3945/jn.117.248187] [Citation(s) in RCA: 79] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Revised: 03/25/2017] [Accepted: 05/23/2017] [Indexed: 11/14/2022] Open
Abstract
Dietary protein quality has been recognized as a critical issue by international authorities because it can affect important functions of the body. To predict protein quality, the FAO introduced the Digestible Indispensable Amino Acid Score. This score depends on ileal amino acid (AA) digestibility; therefore, the assumption is made that AAs are not absorbed in nutritionally relevant amounts from the large intestine. This article reviews the evidence for this assumption by considering the role of the mammalian large intestine in dietary protein and AA digestion and absorption, with particular reference to adult humans. Although most dietary AAs and peptides are absorbed in the small intestine, substantial amounts can enter the large intestine. Nitrogen is absorbed in the large intestine, and a series of animal experiments indicate a potential small degree of AA absorption. In humans, colonocytes have the capacity for AA absorption because AA transporters are present in the large intestine. The absorption of nutritionally relevant amounts of dietary indispensable AAs and peptides in the human large intestine has not been convincingly demonstrated, however.
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Affiliation(s)
| | - Paul J Moughan
- Riddet Institute, Massey University, Palmerston North, New Zealand
| | - Marco Mensink
- Division of Human Nutrition, Wageningen University, Wageningen, Netherlands; and
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Xing P, Shi Y, Dong C, Liu H, Cheng Y, Sun J, Li D, Li M, Sun K, Feng D. Colon-Targeted Delivery of IgY Against Clostridium difficile Toxin A and B by Encapsulation in Chitosan-Ca Pectinate Microbeads. AAPS PharmSciTech 2017; 18:1095-1103. [PMID: 27826799 DOI: 10.1208/s12249-016-0656-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Accepted: 10/26/2016] [Indexed: 12/18/2022] Open
Abstract
This study investigated the use of a newly developed chitosan-Ca pectinate microbead formulation for the colon-targeted delivery of anti-A/B toxin immunoglobulin of egg yolk (IgY) to inhibit toxin binding to colon mucosa cells. The effect of the three components (pectinate, calcium chloride, and chitosan) used for the microbead production was examined with the aim of identifying the optimal levels to improve drug encapsulation efficiency, swelling ratio, and cumulative IgY release rate. The optimized IgY-loaded bead component was pectin 5% (w/v), CaCl2 3% (w/v), and chitosan 0.5% (w/v). Formulated beads were spherical with 1.2-mm diameter, and the drug loading was 45%. An in vitro release study revealed that chitosan-Ca pectinate microbeads inhibited IgY release in the upper gastrointestinal tract and significantly improved the site-specific release of IgY in the colon. An in vivo rat study demonstrated that 72.6% of biologically active IgY was released specifically in the colon. These results demonstrated that anti-A/B toxin IgY-loaded chitosan-Ca pectinate oral microbeads improved IgY release behavior in vivo, which could be used as an effective oral delivery platform for the biological treatment of Clostridium difficile infection (CDI).
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Gut microbiota functions: metabolism of nutrients and other food components. Eur J Nutr 2017; 57:1-24. [PMID: 28393285 PMCID: PMC5847071 DOI: 10.1007/s00394-017-1445-8] [Citation(s) in RCA: 1265] [Impact Index Per Article: 180.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2016] [Accepted: 03/23/2017] [Indexed: 02/07/2023]
Abstract
The diverse microbial community that inhabits the human gut has an extensive metabolic repertoire that is distinct from, but complements the activity of mammalian enzymes in the liver and gut mucosa and includes functions essential for host digestion. As such, the gut microbiota is a key factor in shaping the biochemical profile of the diet and, therefore, its impact on host health and disease. The important role that the gut microbiota appears to play in human metabolism and health has stimulated research into the identification of specific microorganisms involved in different processes, and the elucidation of metabolic pathways, particularly those associated with metabolism of dietary components and some host-generated substances. In the first part of the review, we discuss the main gut microorganisms, particularly bacteria, and microbial pathways associated with the metabolism of dietary carbohydrates (to short chain fatty acids and gases), proteins, plant polyphenols, bile acids, and vitamins. The second part of the review focuses on the methodologies, existing and novel, that can be employed to explore gut microbial pathways of metabolism. These include mathematical models, omics techniques, isolated microbes, and enzyme assays.
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Gryp T, Vanholder R, Vaneechoutte M, Glorieux G. p-Cresyl Sulfate. Toxins (Basel) 2017; 9:toxins9020052. [PMID: 28146081 PMCID: PMC5331431 DOI: 10.3390/toxins9020052] [Citation(s) in RCA: 220] [Impact Index Per Article: 31.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2016] [Revised: 01/12/2017] [Accepted: 01/23/2017] [Indexed: 12/16/2022] Open
Abstract
If chronic kidney disease (CKD) is associated with an impairment of kidney function, several uremic solutes are retained. Some of these exert toxic effects, which are called uremic toxins. p-Cresyl sulfate (pCS) is a prototype protein-bound uremic toxin to which many biological and biochemical (toxic) effects have been attributed. In addition, increased levels of pCS have been associated with worsening outcomes in CKD patients. pCS finds its origin in the intestine where gut bacteria metabolize aromatic amino acids, such as tyrosine and phenylalanine, leading to phenolic end products, of which pCS is one of the components. In this review we summarize the biological effects of pCS and its metabolic origin in the intestine. It appears that, according to in vitro studies, the intestinal bacteria generating phenolic compounds mainly belong to the families Bacteroidaceae, Bifidobacteriaceae, Clostridiaceae, Enterobacteriaceae, Enterococcaceae, Eubacteriaceae, Fusobacteriaceae, Lachnospiraceae, Lactobacillaceae, Porphyromonadaceae, Staphylococcaceae, Ruminococcaceae, and Veillonellaceae. Since pCS remains difficult to remove by dialysis, the gut microbiota could be a future target to decrease pCS levels and its toxicity, even at earlier stages of CKD, aiming at slowing down the progression of the disease and decreasing the cardiovascular burden.
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Affiliation(s)
- Tessa Gryp
- Department of Internal Medicine, Nephrology Division, Ghent University Hospital, 9000 Ghent, Belgium.
- Laboratory for Bacteriology Research, Department of Clinical Chemistry, Microbiology & Immunology, Ghent University, 9000 Ghent, Belgium.
| | - Raymond Vanholder
- Department of Internal Medicine, Nephrology Division, Ghent University Hospital, 9000 Ghent, Belgium.
| | - Mario Vaneechoutte
- Laboratory for Bacteriology Research, Department of Clinical Chemistry, Microbiology & Immunology, Ghent University, 9000 Ghent, Belgium.
| | - Griet Glorieux
- Department of Internal Medicine, Nephrology Division, Ghent University Hospital, 9000 Ghent, Belgium.
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Mayers MD, Moon C, Stupp GS, Su AI, Wolan DW. Quantitative Metaproteomics and Activity-Based Probe Enrichment Reveals Significant Alterations in Protein Expression from a Mouse Model of Inflammatory Bowel Disease. J Proteome Res 2017; 16:1014-1026. [PMID: 28052195 DOI: 10.1021/acs.jproteome.6b00938] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Tandem mass spectrometry based shotgun proteomics of distal gut microbiomes is exceedingly difficult due to the inherent complexity and taxonomic diversity of the samples. We introduce two new methodologies to improve metaproteomic studies of microbiome samples. These methods include the stable isotope labeling in mammals to permit protein quantitation across two mouse cohorts as well as the application of activity-based probes to enrich and analyze both host and microbial proteins with specific functionalities. We used these technologies to study the microbiota from the adoptive T cell transfer mouse model of inflammatory bowel disease (IBD) and compare these samples to an isogenic control, thereby limiting genetic and environmental variables that influence microbiome composition. The data generated highlight quantitative alterations in both host and microbial proteins due to intestinal inflammation and corroborates the observed phylogenetic changes in bacteria that accompany IBD in humans and mouse models. The combination of isotope labeling with shotgun proteomics resulted in the total identification of 4434 protein clusters expressed in the microbial proteomic environment, 276 of which demonstrated differential abundance between control and IBD mice. Notably, application of a novel cysteine-reactive probe uncovered several microbial proteases and hydrolases overrepresented in the IBD mice. Implementation of these methods demonstrated that substantial insights into the identity and dysregulation of host and microbial proteins altered in IBD can be accomplished and can be used in the interrogation of other microbiome-related diseases.
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Affiliation(s)
- Michael D Mayers
- Department of Molecular and Experimental Medicine, ‡Department of Integrative Structural and Computational Biology, and §Department of Chemical Physiology, The Scripps Research Institute , 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Clara Moon
- Department of Molecular and Experimental Medicine, ‡Department of Integrative Structural and Computational Biology, and §Department of Chemical Physiology, The Scripps Research Institute , 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Gregory S Stupp
- Department of Molecular and Experimental Medicine, ‡Department of Integrative Structural and Computational Biology, and §Department of Chemical Physiology, The Scripps Research Institute , 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Andrew I Su
- Department of Molecular and Experimental Medicine, ‡Department of Integrative Structural and Computational Biology, and §Department of Chemical Physiology, The Scripps Research Institute , 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Dennis W Wolan
- Department of Molecular and Experimental Medicine, ‡Department of Integrative Structural and Computational Biology, and §Department of Chemical Physiology, The Scripps Research Institute , 10550 North Torrey Pines Road, La Jolla, California 92037, United States
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Nallu A, Sharma S, Ramezani A, Muralidharan J, Raj D. Gut microbiome in chronic kidney disease: challenges and opportunities. Transl Res 2017; 179:24-37. [PMID: 27187743 PMCID: PMC5086447 DOI: 10.1016/j.trsl.2016.04.007] [Citation(s) in RCA: 159] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2016] [Revised: 04/12/2016] [Accepted: 04/16/2016] [Indexed: 02/07/2023]
Abstract
More than 100 trillion microbial cells that reside in the human gut heavily influence nutrition, metabolism, and immune function of the host. Gut dysbiosis, seen commonly in patients with chronic kidney disease (CKD), results from qualitative and quantitative changes in host microbiome profile and disruption of gut barrier function. Alterations in gut microbiota and a myriad of host responses have been implicated in progression of CKD, increased cardiovascular risk, uremic toxicity, and inflammation. We present a discussion of dysbiosis, various uremic toxins produced from dysbiotic gut microbiome, and their roles in CKD progression and complications. We also review the gut microbiome in renal transplant, highlighting the role of commensal microbes in alteration of immune responses to transplantation, and conclude with therapeutic interventions that aim to restore intestinal dysbiosis.
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Affiliation(s)
- Anitha Nallu
- Division of Renal Diseases and Hypertension, The George Washington University, Washington, DC
| | - Shailendra Sharma
- Division of Renal Diseases and Hypertension, The George Washington University, Washington, DC
| | - Ali Ramezani
- Division of Renal Diseases and Hypertension, The George Washington University, Washington, DC
| | - Jagadeesan Muralidharan
- Division of Renal Diseases and Hypertension, The George Washington University, Washington, DC
| | - Dominic Raj
- Division of Renal Diseases and Hypertension, The George Washington University, Washington, DC.
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29
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Aguirre TAS, Teijeiro-Osorio D, Rosa M, Coulter IS, Alonso MJ, Brayden DJ. Current status of selected oral peptide technologies in advanced preclinical development and in clinical trials. Adv Drug Deliv Rev 2016; 106:223-241. [PMID: 26921819 DOI: 10.1016/j.addr.2016.02.004] [Citation(s) in RCA: 211] [Impact Index Per Article: 26.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Revised: 02/15/2016] [Accepted: 02/18/2016] [Indexed: 01/12/2023]
Abstract
The development of oral dosage forms that allows absorption of therapeutic peptides to the systemic circulation is one of the greatest challenges for the pharmaceutical industry. Currently, a number of technologies including either mixtures of penetration enhancers or protease inhibitors and/or nanotechnology-based products are under clinical development. Typically, these formulations are presented in the form of enteric-coated tablets or capsules. Systems undergoing preclinical investigation include further advances in nanotechnology, including intestinal microneedle patches, as well as their combination with regional delivery to the colon. This review critically examines four selected promising oral peptide technologies at preclinical stage and the twelve that have progressed to clinical trials, as indicated in www.clinicaltrials.gov. We examined these technologies under the criteria of peptide selection, formulation design, system components and excipients, intestinal mechanism of action, efficacy in man, and safety issues. The conclusion is that most of the technologies in clinical trials are incremental rather than paradigm-shifting and that even the more clinically advanced oral peptide drugs examples of oral bioavailability appear to yield oral bioavailability values of only 1-2% and are, therefore, only currently suitable for a limited range of peptides.
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Affiliation(s)
- T A S Aguirre
- Centro de Ciências Exatas e Tecnologia, Universidade de Caxias do Sul (UCS), Caxias do Sul, Brazil
| | - D Teijeiro-Osorio
- CIMUS Research Institute, University of Santiago de Compostela, Santiago de Compostela, Spain
| | - M Rosa
- Sigmoid Pharma, Dublin City University, Invent Centre, Dublin 9, Ireland
| | - I S Coulter
- Sigmoid Pharma, Dublin City University, Invent Centre, Dublin 9, Ireland
| | - M J Alonso
- CIMUS Research Institute, University of Santiago de Compostela, Santiago de Compostela, Spain.
| | - D J Brayden
- UCD School of Veterinary Medicine and UCD Conway Institute, University College Dublin, Belfield, Dublin 4, Ireland.
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30
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The effects of retrogradation and amylose/amylopectin ratio of starches on carbohydrate fermentation and microbial populations in the porcine colon. ACTA ACUST UNITED AC 2016. [DOI: 10.1017/s1357729800050529] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
AbstractThe colon of the simple-stomached animal comprises a gradually changing microbial environment, using the residues of digestion as substrates for fermentation. As carbohydrate sources decline along the length of the colon, the microflora degrade proteins to use as an energy supply, resulting in the formation of undesirable and potentially toxic metabolites. This study has examined the possibility of using dietary starches as a means of extending carbohydrate fermentation along the colon in order to reduce the effects of protein degradation, and the influence of these starches on the numbers of microbial groups within the total population. The study was carried out in weaned piglets, using native and retrograded forms of maize and waxy maize starches, containing proportionately about 0·25 and 0·01 amylose respectively. It was found that protein degradation in the mid and distal regions of the colon was best reduced by the inclusion of the retrograded form of waxy maize, although these data did not achieve significance. However, it was found that a reduced population of the protein-degrading Bacteroides spp. resulted from the inclusion of waxy maize rather than maize in the diets, (proximal colon P < 0·01 ; mid colon P < 0·001 , distal colon P < 0·05), while the retrograded waxy maize produced increased lactobacillixoliform ratios throughout the colon, which may result in an improved resistance to infection by intestinal pathogens. Retrogradation of these starches reduced the coliform populations throughout the colon, with significant (P < 0·05) effects observed in the proximal and distal regions. The data suggest that, of the starches tested, reduced protein-degrading activity and improved pathogen resistance may be achieved with retrograded waxy maize.
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31
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Van de Wiele T, Van Praet JT, Marzorati M, Drennan MB, Elewaut D. How the microbiota shapes rheumatic diseases. Nat Rev Rheumatol 2016; 12:398-411. [PMID: 27305853 DOI: 10.1038/nrrheum.2016.85] [Citation(s) in RCA: 93] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The human gut harbours a tremendously diverse and abundant microbial community that correlates with, and even modulates, many health-related processes. The mucosal interfaces are particularly active sites of microorganism-host interplay. Growing insight into the characteristic composition and functionality of the mucosal microbiota has revealed that the microbiota is involved in mucosal barrier integrity and immune function. This involvement affects proinflammatory and anti-inflammatory processes not only at the epithelial level, but also at remote sites such as the joints. Here, we review the role of the gut microbiota in shaping local and systemic immune responses and how disturbances in the host-microorganism interplay can potentially affect the development and progression of rheumatic diseases. Increasing our understanding of how to promote host-microorganism homeostasis could therefore reveal novel strategies for the prevention or alleviation of rheumatic disease.
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Affiliation(s)
- Tom Van de Wiele
- Laboratory of Microbial Ecology and Technology (LabMET), Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, Ghent, B-9000, Belgium
| | - Jens T Van Praet
- Laboratory for Molecular Immunology and Inflammation, Department of Rheumatology, Ghent University Hospital, De Pintelaan 185, Ghent, B-9000, Belgium.,Unit for Molecular Immunology and Inflammation, VIB Inflammation Research Center, Ghent University, 'Fiers-Schell-Van Montagu' building, Technologiepark 927, B-9052 Ghent (Zwijnaarde), Belgium.,Division of Nephrology and Infectious Diseases, AZ Sint-Jan Brugge-Oostende AV, Ruddershove 10, 8000 Bruges, Belgium
| | - Massimo Marzorati
- Laboratory of Microbial Ecology and Technology (LabMET), Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, Ghent, B-9000, Belgium
| | - Michael B Drennan
- Laboratory for Molecular Immunology and Inflammation, Department of Rheumatology, Ghent University Hospital, De Pintelaan 185, Ghent, B-9000, Belgium.,Unit for Molecular Immunology and Inflammation, VIB Inflammation Research Center, Ghent University, 'Fiers-Schell-Van Montagu' building, Technologiepark 927, B-9052 Ghent (Zwijnaarde), Belgium
| | - Dirk Elewaut
- Laboratory for Molecular Immunology and Inflammation, Department of Rheumatology, Ghent University Hospital, De Pintelaan 185, Ghent, B-9000, Belgium.,Unit for Molecular Immunology and Inflammation, VIB Inflammation Research Center, Ghent University, 'Fiers-Schell-Van Montagu' building, Technologiepark 927, B-9052 Ghent (Zwijnaarde), Belgium
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32
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Ramezani A, Massy ZA, Meijers B, Evenepoel P, Vanholder R, Raj DS. Role of the Gut Microbiome in Uremia: A Potential Therapeutic Target. Am J Kidney Dis 2016; 67:483-98. [PMID: 26590448 PMCID: PMC5408507 DOI: 10.1053/j.ajkd.2015.09.027] [Citation(s) in RCA: 240] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Accepted: 09/25/2015] [Indexed: 02/08/2023]
Abstract
Also known as the "second human genome," the gut microbiome plays important roles in both the maintenance of health and the pathogenesis of disease. The symbiotic relationship between host and microbiome is disturbed due to the proliferation of dysbiotic bacteria in patients with chronic kidney disease (CKD). Fermentation of protein and amino acids by gut bacteria generates excess amounts of potentially toxic compounds such as ammonia, amines, thiols, phenols, and indoles, but the generation of short-chain fatty acids is reduced. Impaired intestinal barrier function in patients with CKD permits translocation of gut-derived uremic toxins into the systemic circulation, contributing to the progression of CKD, cardiovascular disease, insulin resistance, and protein-energy wasting. The field of microbiome research is still nascent, but is evolving rapidly. Establishing symbiosis to treat uremic syndrome is a novel concept, but if proved effective, it will have a significant impact on the management of patients with CKD.
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Affiliation(s)
- Ali Ramezani
- Division of Renal Diseases and Hypertension, The George Washington University, Washington, DC
| | - Ziad A Massy
- Division of Nephrology, Ambroise Paré University Hospital, Assistance Publique-Hôpitaux de Paris, University of Paris Ouest-ersailles-Saint-Quentin-en-Yvelines (UVSQ), Boulogne-Billancourt/Paris, France; INSERM U1018, Research Centre in Epidemiology and Population Health (CESP) Team 5, University of Paris Ouest-Versailles-Saint-Quentin-en-Yvelines (UVSQ), Villejuif, France
| | - Björn Meijers
- Division of Nephrology, Department of Microbiology and Immunology, University Hospitals Leuven, Leuven, Belgium
| | - Pieter Evenepoel
- Division of Nephrology, Department of Microbiology and Immunology, University Hospitals Leuven, Leuven, Belgium
| | - Raymond Vanholder
- Nephrology Section, Department of Internal Medicine, University Hospital, Ghent, Belgium
| | - Dominic S Raj
- Division of Renal Diseases and Hypertension, The George Washington University, Washington, DC.
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Sampaio-Maia B, Simões-Silva L, Pestana M, Araujo R, Soares-Silva IJ. The Role of the Gut Microbiome on Chronic Kidney Disease. ADVANCES IN APPLIED MICROBIOLOGY 2016; 96:65-94. [PMID: 27565581 DOI: 10.1016/bs.aambs.2016.06.002] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Chronic kidney disease (CKD) is estimated to affect nearly 500 million people worldwide and cardiovascular (CV) disease is a major cause of death in this population. However, therapeutic interventions targeting traditional CV risks are not effective at lowering the incidence of CV events or at delaying the progression of the disease in CKD patients. In recent years, disturbances of normal gut microbiome were recognized in the pathogenesis of diverse chronic diseases. Gut dysbiosis is being unraveled in CKD and pointed as a nontraditional risk factor for CV risk and CKD progression. The most often reported changes in gut microbiome in CKD are related to the lower levels of Bifidobacteriaceae and Lactobacillaceae and to higher levels of Enterobacteriaceae. Although metagenomics brought us an amplified vision on the microbial world that inhabits the human host, it still lacks the sensitivity to characterize the microbiome up to species level, not revealing alterations that occur within specific genus. Here, we review the current state-of-the-art concerning gut dysbiosis in CKD and its role in pathophysiological mechanisms in CKD, particularly in relation with CV risk. Also, the strategies towards prevention and treatment of gut dysbiosis in CKD progression will be discussed.
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Affiliation(s)
| | | | - M Pestana
- University of Porto, Porto, Portugal; São João Hospital Center, Porto, EPE, Portugal
| | - R Araujo
- University of Porto, Porto, Portugal; Flinders University, Adelaide, SA, Australia
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Yao CK, Muir JG, Gibson PR. Review article: insights into colonic protein fermentation, its modulation and potential health implications. Aliment Pharmacol Ther 2016; 43:181-96. [PMID: 26527169 DOI: 10.1111/apt.13456] [Citation(s) in RCA: 244] [Impact Index Per Article: 30.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2015] [Revised: 09/11/2015] [Accepted: 10/13/2015] [Indexed: 02/06/2023]
Abstract
BACKGROUND Beneficial effects of carbohydrate fermentation on gastrointestinal health are well established. Conversely, protein fermentation generates harmful metabolites but their relevance to gastrointestinal health is poorly understood. AIM To review the effects of increased protein fermentation on biomarkers of colonic health, factors influencing fermentative activity and potential for dietary modulation to minimise detrimental effects. METHODS A literature search was performed in PubMed, Medline, EMBASE and Google scholar for clinical and pre-clinical studies using search terms - 'dietary protein', 'fermentation', 'putrefaction', 'phenols', 'sulphide', 'branched-chain fatty acid', 'carbohydrate fermentation', 'gastrointestinal'. RESULTS High protein, reduced carbohydrate diets alter the colonic microbiome, favouring a potentially pathogenic and pro-inflammatory microbiota profile, decreased short-chain fatty acid production and increased ammonia, phenols and hydrogen sulphide concentrations. These metabolites largely compromise the colonic epithelium structure, causing mucosal inflammation but may also directly modulate the enteric nervous system and intestinal motility. Increased protein fermentation as a result of a high-protein intake can be attenuated by addition of oligosaccharides, resistant starch and nonstarch polysaccharides and a reduction in total protein or specifically, aromatic and sulphur-containing amino acids. These factors may have clinical importance as novel therapeutic approaches to problems, in which protein fermentation may be implicated, such as malodorous flatus, irritable bowel syndrome, ulcerative colitis and prevention of colorectal cancer. CONCLUSIONS The direct clinical relevance of excessive protein fermentation in the pathogenesis of irritable bowel syndrome, malodorous flatus and ulcerative colitis are underexplored. Manipulating dietary carbohydrate and protein intake have potential therapeutic applications in such settings and warrant further clinical studies.
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Affiliation(s)
- C K Yao
- Department of Gastroenterology, Monash University, Alfred Health, Melbourne, Vic., Australia
| | - J G Muir
- Department of Gastroenterology, Monash University, Alfred Health, Melbourne, Vic., Australia
| | - P R Gibson
- Department of Gastroenterology, Monash University, Alfred Health, Melbourne, Vic., Australia
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Sawarkar SP, Deshpande SG, Bajaj AN, Nikam VS. In Vivo Evaluation of 5-ASA Colon-Specific Tablets Using Experimental-Induced Colitis Rat Animal Model. AAPS PharmSciTech 2015; 16:1445-54. [PMID: 26017284 DOI: 10.1208/s12249-015-0331-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Accepted: 05/07/2015] [Indexed: 11/30/2022] Open
Abstract
Colonic drug delivery is intended not only for local treatment in inflammatory bowel disease (IBD) but also for systemic delivery of therapeutics. Intestinal myeloperoxidase (MPO) determination could be used to estimate the average level of inflammation in colon as well as to determine the efficacy of drugs to be used in the treatment of inflammatory bowel diseases or study the specificity of dosage forms to be used for colonic targeting of anti-inflammatory drugs. Colonic prodrug sulfasalazine (SASP) gets metabolized to give 5-aminosalicylic acid (5-ASA), which is the active portion of SASP. However, when given orally, 5-ASA is absorbed in upper part of gastrointestinal tract (GIT) and not made available in colon. In the present study, colon-targeted delivery of 5-ASA was achieved by formulating tablets with two natural polymers namely guar gum and pectin using compression coating method. Colonic specificity of 5-ASA tablets (prepared using guar gum and pectin as polymers) was evaluated in vitro using simulated fluids mimicking in vivo environment as well as in vivo method using chemically (2,4,6-trinitrobenzenesulfonic acid and acetic acid)-induced colitis rat model. Both colon-specific formulations of 5-ASA (guar gum and pectin) were observed to be more effective in reducing inflammation in chemically induced colitis rat models when compared to colon-specific prodrug sulfasalazine as well as conventional 5-ASA administered orally.
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Amidon S, Brown JE, Dave VS. Colon-targeted oral drug delivery systems: design trends and approaches. AAPS PharmSciTech 2015; 16:731-41. [PMID: 26070545 DOI: 10.1208/s12249-015-0350-9] [Citation(s) in RCA: 244] [Impact Index Per Article: 27.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Accepted: 06/04/2015] [Indexed: 12/15/2022] Open
Abstract
Colon-specific drug delivery systems (CDDS) are desirable for the treatment of a range of local diseases such as ulcerative colitis, Crohn's disease, irritable bowel syndrome, chronic pancreatitis, and colonic cancer. In addition, the colon can be a potential site for the systemic absorption of several drugs to treat non-colonic conditions. Drugs such as proteins and peptides that are known to degrade in the extreme gastric pH, if delivered to the colon intact, can be systemically absorbed by colonic mucosa. In order to achieve effective therapeutic outcomes, it is imperative that the designed delivery system specifically targets the drugs into the colon. Several formulation approaches have been explored in the development colon-targeted drug delivery systems. These approaches involve the use of formulation components that interact with one or more aspects of gastrointestinal (GI) physiology, such as the difference in the pH along the GI tract, the presence of colonic microflora, and enzymes, to achieve colon targeting. This article highlights the factors influencing colon-specific drug delivery and colonic bioavailability, and the limitations associated with CDDS. Further, the review provides a systematic discussion of various conventional, as well as relatively newer formulation approaches/technologies currently being utilized for the development of CDDS.
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37
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Stability of peptide drugs in the colon. Eur J Pharm Sci 2015; 78:31-6. [PMID: 26111980 DOI: 10.1016/j.ejps.2015.06.018] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2015] [Revised: 06/19/2015] [Accepted: 06/22/2015] [Indexed: 11/21/2022]
Abstract
This study was the first to investigate the colonic stability of 17 peptide molecules (insulin, calcitonin, glucagon, secretin, somatostatin, desmopressin, oxytocin, Arg-vasopressin, octreotide, ciclosporin, leuprolide, nafarelin, buserelin, histrelin, [D-Ser(4)]-gonadorelin, deslorelin, and goserelin) in a model of the large intestine using mixed human faecal bacteria. Of these, the larger peptides - insulin, calcitonin, somatostatin, glucagon and secretin - were metabolized rapidly, with complete degradation observed within 5 min. In contrast, a number of the smaller peptides - Arg-vasopressin, desmopressin, oxytocin, gonadorelin, goserelin, buserelin, leuprolide, nafarelin and deslorelin - degraded more slowly, while octreotide, histrelin and ciclosporin were seen to be more stable as compared to the other small peptides under the same conditions. Peptide degradation rate was directly correlated to peptide lipophilicity (logP); those peptides with a higher logP were more stable in the colonic model (R(2)=0.94). In the absence of human faecal bacteria, all peptides were stable. This study highlights the impact of the colonic environment - in particular, the gut microbiota - on the metabolism of peptide drugs, and identifies potential peptide candidates for drug delivery to the colon.
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Sjögren E, Dahlgren D, Roos C, Lennernäs H. Human in Vivo Regional Intestinal Permeability: Quantitation Using Site-Specific Drug Absorption Data. Mol Pharm 2015; 12:2026-39. [DOI: 10.1021/mp500834v] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Erik Sjögren
- Department of Pharmacy, Biopharmaceutic
Research Group, Uppsala University, SE-751 23 Uppsala, Sweden
| | - David Dahlgren
- Department of Pharmacy, Biopharmaceutic
Research Group, Uppsala University, SE-751 23 Uppsala, Sweden
| | - Carl Roos
- Department of Pharmacy, Biopharmaceutic
Research Group, Uppsala University, SE-751 23 Uppsala, Sweden
| | - Hans Lennernäs
- Department of Pharmacy, Biopharmaceutic
Research Group, Uppsala University, SE-751 23 Uppsala, Sweden
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Investigation of coco-glucoside as a novel intestinal permeation enhancer in rat models. Eur J Pharm Biopharm 2014; 88:856-65. [DOI: 10.1016/j.ejpb.2014.10.013] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2014] [Revised: 10/20/2014] [Accepted: 10/24/2014] [Indexed: 01/28/2023]
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Ikehara O, Hayashi H, Waguri T, Kaji I, Karaki SI, Kuwahara A, Suzuki Y. Luminal trypsin induces enteric nerve-mediated anion secretion in the mouse cecum. J Physiol Sci 2014; 64:119-28. [PMID: 24421180 PMCID: PMC10717537 DOI: 10.1007/s12576-013-0302-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2013] [Accepted: 12/10/2013] [Indexed: 02/08/2023]
Abstract
Proteases play a diverse role in health and disease. An excessive concentration of proteases has been found in the feces of patients with inflammatory bowel disease or irritable bowel syndrome and been implicated in the pathogenesis of such disorders. This study examined the effect of the serine protease, trypsin, on intestinal epithelial anion secretion when added to the luminal side. A mucosal-submucosal sheet of the mouse cecum was mounted in Ussing chambers, and the short-circuit current (I sc) was measured. Trypsin added to the mucosal (luminal) side increased I sc with an ED50 value of approximately 10 μM. This I sc increase was suppressed by removing Cl(-) from the bathing solution. The I sc increase induced by 10-100 μM trypsin was substantially suppressed by tetrodotoxin, and partially inhibited by a neurokinin-1 receptor antagonist, but not by a muscarinic or nicotinic ACh-receptor antagonist. The trypsin-induced I sc increase was also significantly inhibited by a 5-hydroxytryptamine-3 receptor (5-HT3) antagonist and substantially suppressed by the simultaneous addition of both 5-HT3 and 5-HT4 receptor antagonists. We conclude that luminal trypsin activates the enteric reflex to induce anion secretion, 5-HT and substance P playing important mediating roles in this secreto-motor reflex. Luminal proteases may contribute to the cause of diarrhea occurring with some intestinal disorders.
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Affiliation(s)
- Osamu Ikehara
- Laboratory of Physiology, Department of Food and Nutritional Sciences, University of Shizuoka, Yada 52-1, Surugaku, Shizuoka, 422-8526 Japan
| | - Hisayoshi Hayashi
- Laboratory of Physiology, Department of Food and Nutritional Sciences, University of Shizuoka, Yada 52-1, Surugaku, Shizuoka, 422-8526 Japan
| | - Toshiharu Waguri
- Laboratory of Physiology, Department of Food and Nutritional Sciences, University of Shizuoka, Yada 52-1, Surugaku, Shizuoka, 422-8526 Japan
| | - Izumi Kaji
- Laboratory of Physiology, Department of Environmental Health Sciences, Graduate School of Nutritional and Environmental Sciences, University of Shizuoka, Yada 52-1, Surugaku, Shizuoka, 422-8526 Japan
| | - Shin-ichiro Karaki
- Laboratory of Physiology, Department of Environmental Health Sciences, Graduate School of Nutritional and Environmental Sciences, University of Shizuoka, Yada 52-1, Surugaku, Shizuoka, 422-8526 Japan
| | - Atsukazu Kuwahara
- Laboratory of Physiology, Department of Environmental Health Sciences, Graduate School of Nutritional and Environmental Sciences, University of Shizuoka, Yada 52-1, Surugaku, Shizuoka, 422-8526 Japan
| | - Yuichi Suzuki
- Laboratory of Physiology, Department of Food and Nutritional Sciences, University of Shizuoka, Yada 52-1, Surugaku, Shizuoka, 422-8526 Japan
- Laboratory of Anatomy and Physiology, Department of Health and Nutrition, Sendai Shirayuri Women’s College, Hondacho 6-1, Izumi-ku, Sendai, 981-3107 Japan
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41
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Malayandi R, Kondamudi PK, Ruby PK, Aggarwal D. Biopharmaceutical considerations and characterizations in development of colon targeted dosage forms for inflammatory bowel disease. Drug Deliv Transl Res 2013; 4:187-202. [DOI: 10.1007/s13346-013-0185-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Carroll IM, Ringel-Kulka T, Ferrier L, Wu MC, Siddle JP, Bueno L, Ringel Y. Fecal protease activity is associated with compositional alterations in the intestinal microbiota. PLoS One 2013; 8:e78017. [PMID: 24147109 PMCID: PMC3798377 DOI: 10.1371/journal.pone.0078017] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2013] [Accepted: 09/16/2013] [Indexed: 12/23/2022] Open
Abstract
Objective Intestinal proteases carry out a variety of functions in the gastrointestinal (GI) tract. Studies have reported that elevated enteric proteases in patients with GI disease can alter intestinal physiology, however the origin (human vs. microbial) of elevated proteases in patients with GI disease is unclear. Aim The aim of this study was to investigate the association between protease activity and the microbiota in human fecal samples. Design In order to capture a wide range of fecal protease (FP) activity stool samples were collected from 30 IBS patients and 24 healthy controls. The intestinal microbiota was characterized using 454 high throughput pyro-sequencing of the 16S rRNA gene. The composition and diversity of microbial communities were determined and compared using the Quantitative Insights Into Microbial Ecology (QIIME) pipeline. FP activity levels were determined using an ELISA-based method. FP activity was ranked and top and bottom quartiles (n=13 per quartile) were identified as having high and low FP activity, respectively. Results The overall diversity of the intestinal microbiota displayed significant clustering separation (p = 0.001) between samples with high vs. low FP activity. The Lactobacillales, Lachnospiraceae, and Streptococcaceae groups were positively associated with FP activity across the entire study population, whilst the Ruminococcaceae family and an unclassified Coriobacteriales family were negatively associated with FP activity. Conclusions These data demonstrate significant associations between specific intestinal bacterial groups and fecal protease activity and provide a basis for further causative studies investigating the role of enteric microbes and GI diseases.
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Affiliation(s)
- Ian M. Carroll
- Division of Gastroenterology and Hepatology, Department of Medicine, the University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
| | - Tamar Ringel-Kulka
- Gillings School of Global Public Health, the University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
| | - Laurent Ferrier
- INRA, UMR1331 Toxalim, Neuro-Gastroenterology & Nutrition group, Toulouse, France
| | - Michael C. Wu
- Department of Biostatistics, Gillings School of Global Public Health, the University of North Carolina, Chapel Hill, Chapel Hill, North Carolina, United States of America
| | - Jennica P. Siddle
- Division of Gastroenterology and Hepatology, Department of Medicine, the University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
| | - Lionel Bueno
- INRA, UMR1331 Toxalim, Neuro-Gastroenterology & Nutrition group, Toulouse, France
| | - Yehuda Ringel
- Division of Gastroenterology and Hepatology, Department of Medicine, the University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
- * E-mail:
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Poesen R, Meijers B, Evenepoel P. The colon: an overlooked site for therapeutics in dialysis patients. Semin Dial 2013; 26:323-32. [PMID: 23458264 DOI: 10.1111/sdi.12082] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Morbidity and mortality related to chronic kidney disease remain unacceptably high, despite tremendous progress in its prevention and treatment. In an ongoing quest to improve outcome in chronic kidney disease patients, the colon might be an appealing, but largely underexplored, therapeutic target. A clear bi-directional functional relationship exists between the colon and kidney, also referred as to the colo-renal axis. Uremia has an important impact on the colonic microbiome. The microbiome, in turn, is an important source of uremic toxins, with p-cresyl sulfate and indoxyl sulfate as important prototypes. These co-metabolites accumulate in the face of a falling kidney function, and may accelerate the progression of renal and cardiovascular disease. Several therapeutic interventions, including prebiotics and adsorbants, specifically target these colon-derived uremic toxins originating from bacterial metabolism. As kidney function declines, the colon also gains importance in the homeostasis and disposal of potassium and oxalate. Their colonic secretion may be increased by drugs increasing the expression of cAMP and by probiotics (e.g., Oxalobacter formigenes).
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Affiliation(s)
- Ruben Poesen
- Division of Nephrology, Department of Microbiology and Immunology, University Hospitals Leuven, Leuven, Belgium
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Colonic absorption of salmon calcitonin using tetradecyl maltoside (TDM) as a permeation enhancer. Eur J Pharm Sci 2013; 48:726-34. [PMID: 23354154 DOI: 10.1016/j.ejps.2013.01.009] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2012] [Revised: 12/14/2012] [Accepted: 01/09/2013] [Indexed: 11/21/2022]
Abstract
Calcitonin is used as a second line treatment of postmenopausal osteoporosis, but widespread acceptance is somewhat limited by subcutaneous and intranasal routes of delivery. This study attempted to enable intestinal sCT absorption in rats using the mild surfactant, tetradecyl maltoside (TDM) as an intestinal permeation enhancer. Human Caco-2 and HT29-MTX-E12 mucus-covered intestinal epithelial monolayers were used for permeation studies. Rat in situ intestinal instillation studies were conducted to evaluate the absorption of sCT with and without 0.1 w/v% TDM in jejunum, ileum and colon. TDM significantly enhanced sCT permeation across intestinal epithelial monolayers, most likely due to combined paracellular and transcellular actions. In situ, TDM caused an increased absolute bioavailability of sCT in rat colon from 1.0% to 4.6%, whereas no enhancement increase was observed in ileal and jejunal instillations. Histological analysis suggested mild perturbation of colonic epithelia in segments instilled with sCT and TDM. These data suggest that the membrane composition of the colon is different to the small intestine and that it is more amenable to permeation enhancement. Thus, formulations designed to release payload in the colon could be advantageous for systemic delivery of poorly permeable molecules.
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45
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de Wouters T, Doré J, Lepage P. Does our food (environment) change our gut microbiome ('in-vironment'): a potential role for inflammatory bowel disease? Dig Dis 2013; 30 Suppl 3:33-9. [PMID: 23295690 DOI: 10.1159/000342595] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Human biology can only be fully assessed by combining an analysis of both the host and its surrounding environment. As a part of the environment, the human gastrointestinal tract hosts more than 100 trillion bacteria making up the gut microbiota. The human host provides a nutrient-rich environment while the microbiota provides indispensable functions that humans cannot exert themselves. Shifts in the bacterial makeup of the human gut microbiota have been associated with disorders such as inflammatory bowel disease (IBD), irritable bowel syndrome and obesity. However, since most bacteria inhabiting our gut are not cultivable to date, until recently little was known about their individual functions. Metagenomics, i.e. the analysis of the collective genomes present in a defined ecosystem, gives insight into these specific functions. The first extensive catalogue of the intestinal metagenome outnumbers the size of the human genome by a factor of 150. Recently, 3 distinct 'types' of gut composition within the human population have been highlighted. These so-called 'enterotypes' are characterized by the dominant genera (Bacteroides, Prevotella and Ruminococcus) and their co-occurring phylogenetic groups. In accordance with the previously described impact of nutritional behavior (diet, probiotics and prebiotics) on specific bacterial populations, an association has been observed between long-term dietary habits and enterotypes. This recent discovery, i.e. that belonging to one or the other enterotype might be modulated by the diet opens up new perspectives in the fields of IBD, nutrition and therapeutic strategies.
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Affiliation(s)
- Tomas de Wouters
- INRA, MICALIS-UMR1319, Domaine de Vilvert, Jouy-en-Josas, France
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46
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Influence of encapsulated probiotics combined with pressurized longan juice on colon microflora and their metabolic activities on the exposure to simulated dynamic gastrointestinal tract. Food Res Int 2012. [DOI: 10.1016/j.foodres.2012.07.033] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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47
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Maroni A, Zema L, Del Curto MD, Foppoli A, Gazzaniga A. Oral colon delivery of insulin with the aid of functional adjuvants. Adv Drug Deliv Rev 2012; 64:540-56. [PMID: 22086142 DOI: 10.1016/j.addr.2011.10.006] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2011] [Revised: 09/30/2011] [Accepted: 10/27/2011] [Indexed: 12/11/2022]
Abstract
Oral colon delivery is currently considered of importance not only for the treatment of local pathologies, such as primarily inflammatory bowel disease (IBD), but also as a means of accomplishing systemic therapeutic goals. Although the large bowel fails to be ideally suited for absorption processes, it may indeed offer a number of advantages over the small intestine, including a long transit time, lower levels of peptidases and higher responsiveness to permeation enhancers. Accordingly, it has been under extensive investigation as a possible strategy to improve the oral bioavailability of peptide and protein drugs. Because of a strong underlying rationale, most of these studies have focused on insulin. In the present review, the impact of key anatomical and physiological characteristics of the colon on its viability as a protein release site is discussed. Moreover, the main formulation approaches to oral colon targeting are outlined along with the design features and performance of insulin-based devices.
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48
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Berger S, Rufener J, Klimek P, Zachariou Z, Boillat C. Effects of potato-derived protease inhibitors on perianal dermatitis after colon resection for long-segment Hirschsprung's disease. World J Pediatr 2012; 8:173-6. [PMID: 22573429 DOI: 10.1007/s12519-012-0356-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/08/2010] [Accepted: 05/11/2011] [Indexed: 11/26/2022]
Abstract
BACKGROUND After resection of long-segment Hirschsprung's disease, severe perianal dermatitis (SPAD) may occur because of high stool frequency and elevated concentrations of fecal pancreatic proteases. We investigated prospectively the effect of potato-derived protease inhibitors (PPI) on skin conditions in children with postoperative SPAD. METHODS Four children (aged 12 to 24 months) with therapy-resistant SPAD after transanal endorectal pull-through for long-segment Hirschsprung's disease received topical PPI (1% in 20% zinc ointment) with each diaper-change. Parents noted down a subjective dermatitis score daily. Photo documentation and outpatient visits were made to assess the treatment results. RESULTS No adverse effects were observed after treatment with PPI. A remarkable improvement of the dermatitis in 3 of the 4 patients as well as improvements in pain and sleep disorders were observed during the PPI-treatment course. CONCLUSION The results of the study suggest that PPI may reduce otherwise intractable protease-induced skin irritation in infants.
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Affiliation(s)
- Steffen Berger
- Department of Pediatric Surgery, Children's University Hospital, Inselspital, University of Bern, Bern, Switzerland.
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Nery J, Goudez R, Biourge V, Tournier C, Leray V, Martin L, Thorin C, Nguyen P, Dumon H. Influence of dietary protein content and source on colonic fermentative activity in dogs differing in body size and digestive tolerance. J Anim Sci 2012; 90:2570-80. [PMID: 22328724 DOI: 10.2527/jas.2011-4112] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Low-consistency, high-moisture feces have been observed in large dogs (Canis lupus familiaris), compared with small dogs, and particularly in sensitive breeds (e.g., German Shepherd dogs). The aim of this work was to determine if greater colonic protein fermentation is responsible for poorer fecal quality in large sensitive dogs. Twenty-seven bitches were allotted to 4 groups based on size and digestive sensitivity: small, medium, large tolerant, and large sensitive. Five experimental diets varying in protein source [highly digestible wheat gluten (WG) vs. medium digestible poultry meal (PM), and protein concentration from 21.4 to 21.6 (LP) to 38.2 to 39.2% CP (HP)] were tested. Diets were fed for 14 d and followed by a 12-d transition period. Digestive fermentation by-products were investigated in fresh stools [ammonia, phenol, indole, and short chain fatty acids including acetate, propionate, and butyrate (C2 to C4 SCFA), branched-chain fatty acids (BCFA), and valerate] and in urine (phenol and indole). Bacterial populations in feces were identified. The PM diets resulted in greater fecal concentrations of ammonia, BCFA, valerate, indole, and C2 to C4 SCFA than WG diets (P = 0.002, P < 0.001, P = 0.039, P = 0.003, and P = 0.012, respectively). Greater concentrations of ammonia, BCFA, and valerate were found in the feces of dogs fed HP compared with LP diets (P < 0.001, P < 0.001, and P = 0.012, respectively). The concentrations of ammonia, valerate, phenol, and indole in feces of large sensitive dogs were greater (P < 0.001, P < 0.001, P = 0.002, and P = 0.019, respectively) compared with the other groups. The Enterococcus populations were greater in feces of dogs fed with PMHP rather than WGLP diets (P = 0.006). Urinary phenol and indole excretion was greater when dogs were fed PM than WG diets (P < 0.001 and P = 0.038, respectively) and HP than LP diets (P = 0.001 and P = 0.087, respectively). Large sensitive dogs were prone to excrete a greater quantity of phenol in urine (P < 0.001). A diet formulated with highly digestible protein, such as WG, led to reduced concentrations of protein-based fermentation products in feces together with improved fecal quality in dogs, especially in large sensitive ones. Poor fecal quality in large sensitive dogs could be partly related to the pattern of protein fermentation in the hindgut.
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Affiliation(s)
- J Nery
- Laboratory of Nutrition and Endocrinology, Food Science and Engineering, Nantes-Atlantic National College of Veterinary Medicine, ONIRIS, LUNAM Université, 44307 Nantes Cedex 3, France
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50
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Varley PF, Flynn B, Callan JJ, O'Doherty JV. Effect of crude protein and phosphorus level on growth performance, bone mineralisation and phosphorus, calcium and nitrogen utilisation in grower-finisher pigs. Arch Anim Nutr 2011; 65:134-47. [DOI: 10.1080/1745039x.2011.556327] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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