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Emmanuel NS, Yusuf T, Bako IG, Malgwi IS, Eze ED, Ali Z, Aliyu M. Hematological changes, oxidative stress assessment, and dysregulation of aquaporin-3 channel, prolactin, and oxytocin receptors in kidneys of lactating Wistar rats treated with monosodium glutamate. NAUNYN-SCHMIEDEBERG'S ARCHIVES OF PHARMACOLOGY 2024; 397:6213-6229. [PMID: 38446217 DOI: 10.1007/s00210-024-03008-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Accepted: 02/12/2024] [Indexed: 03/07/2024]
Abstract
High consumption of locally produced delicacies could expose nursing mothers to high monosodium glutamate (MSG) levels, frequently used as a necessary condiment in low-income countries. Thus, this study evaluated some novel preliminary changes in renal hormonal receptors, the aquaporin-3 channel, oxidative stress markers, and hematological indices induced by monosodium glutamate in lactating rats. Post-parturition, twenty-four (24) lactating Wistar rats were divided into four (4) groups of six rats each (n = 6). Oral administration of distilled water and MSG started three (3) days postpartum as follows: group 1: distilled water (1 ml/kg BW), group 2: MSG (925 mg/kg BW), group 3: MSG (1850 mg/kg BW), and group 4: MSG (3700 mg/kg BW). At the end of the experiment, which lasted fourteen (14) days, animals were sacrificed and samples of blood and tissues were obtained for biochemical analysis. MSG administration significantly (p < 0.05) increased ROS and MDA, with a significant (p < 0.05) decrease in kidney antioxidants. Serum creatinine, total, conjugated, and unconjugated bilirubin significantly (p < 0.05) increased with MSG administration. The prolactin receptor was significantly reduced (p < 0.05), while the oxytocin receptor and aquaporin-3 channel were significantly (p < 0.05) increased in the MSG-administered groups. There were significant (p < 0.05) changes in the hematological indices of the MSG-administered animals. Thus, the findings of this study suggest that high MSG consumption causes hematological alterations and may alter renal function via increased ROS production and dysregulation of the AQP-3 channel, prolactin, and oxytocin receptors in the kidneys of lactating Wistar rats.
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Affiliation(s)
- Nachamada Solomon Emmanuel
- Department of Human Physiology, Faculty of Basic Medical Sciences, College of Medical Sciences, Ahmadu Bello University, Zaria, Kaduna, Nigeria.
| | - Tanko Yusuf
- Department of Human Physiology, Faculty of Basic Medical Sciences, College of Medical Sciences, Ahmadu Bello University, Zaria, Kaduna, Nigeria
| | - Ibrahim Gaya Bako
- Department of Human Physiology, Faculty of Basic Medical Sciences, College of Medical Sciences, Ahmadu Bello University, Zaria, Kaduna, Nigeria
| | - Ibrahim Samaila Malgwi
- Department of Human Physiology, College of Medical Sciences, University of Maiduguri, Maiduguri, Borno, Nigeria
| | - Ejike Daniel Eze
- Department of Physiology, School of Medicine and Pharmacy, College of Medicine and Health Sciences, University of Rwanda, Huye Campus, Huye, Rwanda
| | - Zubairu Ali
- Department of Human Physiology, College of Medical Sciences, Abubakar Tafawa Balewa University, Bauchi, Nigeria
| | - Mohammed Aliyu
- Department of Human Physiology, Faculty of Basic Medical Sciences, College of Medical Sciences, Ahmadu Bello University, Zaria, Kaduna, Nigeria
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Cao J, Li S, Li D, Hua W, Guo L, Xia Z. Development and Validation of Pretreatment Serum Total Bilirubin as a Biomarker to Predict the Clinical Outcomes in Primary Central Nervous System Lymphoma: A Multicenter Cohort Study. Cancers (Basel) 2023; 15:4584. [PMID: 37760555 PMCID: PMC10526312 DOI: 10.3390/cancers15184584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Revised: 09/06/2023] [Accepted: 09/07/2023] [Indexed: 09/29/2023] Open
Abstract
Primary central nervous system lymphoma (PCNSL) is a predominantly aggressive neoplasm isolated to the central nervous system or vitreoretinal space. Bilirubin is an important biomarker reflecting hepatic function and oxidative stress status that is associated with the occurrence and development of various tumors. However, its prognostic role in PCNSL has yet to be evaluated. Therefore, we conducted a prospective-retrospective study to analyze the predictive value of serum total bilirubin (STB) in PCNSL patients. The association between the pretreatment STB and clinical outcomes in PCNSL was developed in the discovery cohort (retrospective [n = 44] and prospective [n = 45]) and validated in an independent retrospective cohort (n = 69). A generalized additive model, Kaplan-Meier curve, and Cox analysis were applied. In the discovery cohort, the STB showed a linear relationship with overall survival (OS, p = 0.011) and progression-free survival (PFS, p = 0.0476). The median STB level of 12.0 µmol/L was determined as the cutoff value to predict the clinical outcomes with area under the receiver operating characteristic curve (AUROC) values of 0.9205 and 0.8464 for OS and PFS, respectively. The median STB level resulted in similar accuracy for predicting the clinical outcomes in the validation cohort with AUROC values of 0.8857 and 0.8589 for OS and PFS, respectively. In both the discovery and validation cohorts, the Kaplan-Meier survival curve and Cox regression analysis showed that the upper median STB groups showed significantly worse OS than the lower median STB groups. In conclusion, the pretreatment STB could be considered a novel biomarker to predict the clinical outcomes in patients with PCNSL receiving high-dose methotrexate-based combination immunochemotherapy.
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Affiliation(s)
- Jiazhen Cao
- Department of Clinical Laboratory, Fudan University Shanghai Cancer Center, Shanghai 200032, China;
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200032, China
| | - Shengjie Li
- Department of Neurosurgery, Huashan Hospital, Fudan University, Shanghai 200040, China; (S.L.); (W.H.)
- Institute of Neurosurgery, Fudan University, Shanghai 200040, China
- Shanghai Key Laboratory of Brain Function Restoration and Neural Regeneration, Shanghai 200040, China
- Department of Clinical Laboratory, Eye & ENT Hospital, Shanghai Medical College, Fudan University, Shanghai 200031, China
| | - Danhui Li
- Department of Pathology, RenJi Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai 200127, China;
| | - Wei Hua
- Department of Neurosurgery, Huashan Hospital, Fudan University, Shanghai 200040, China; (S.L.); (W.H.)
- Institute of Neurosurgery, Fudan University, Shanghai 200040, China
- Shanghai Key Laboratory of Brain Function Restoration and Neural Regeneration, Shanghai 200040, China
| | - Lin Guo
- Department of Clinical Laboratory, Fudan University Shanghai Cancer Center, Shanghai 200032, China;
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200032, China
| | - Zuguang Xia
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200032, China
- Department of lymphoma, Fudan University Shanghai Cancer Center, Fudan University, Shanghai 200032, China
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Abo-EL-Sooud K, Abd-El Hakim YM, Hashem MM, El-Metwally AE, Hassan BA, El-Nour HH. Restorative effects of gallic acid against sub-chronic hepatic toxicity of co-exposure to zinc oxide nanoparticles and arsenic trioxide in male rats. Heliyon 2023; 9:e17326. [PMID: 37389053 PMCID: PMC10300221 DOI: 10.1016/j.heliyon.2023.e17326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 06/09/2023] [Accepted: 06/14/2023] [Indexed: 07/01/2023] Open
Abstract
Background and objectives This study aimed to assess the effect of zinc oxide nanoparticles (ZNPs) and/or arsenic trioxide (ATO) exposure on the liver of adult male Sprague Dawley rats. Moreover, the probable ameliorative impact of gallic acid (GA) against ZNPs and ATO-induced hepatotoxicity and the possible underlying mechanisms were evaluated. Methods Sixty male Sprague Dawley rats were distributed into six groups. The 1st and 2nd groups were orally given distilled water (1 ml/kg) and 20 mg GA/kg b. wt, respectively. The 3rd and 4th groups were orally given 100 mg ZNPs/kg b. wt and 8 mg ATO/kg b. wt, respectively. The 5th group was co-administered ZNPs and ATO at the doses mentioned above. The last one was co-administered ZNPs, ATO, and GA at the earlier described doses. All tested compounds were orally given once a day for 60 successive days. Then, serum levels of alkaline phosphatase (ALP), alanine aminotransferase (ALT), aspartate aminotransferase (AST), total, direct, indirect bilirubin, triglycerides, total cholesterol, HDL, VLDL, and LDL were estimated. The hepatic content of malondialdehyde (MDA), superoxide dismutase (SOD), and glutathione peroxidase (GPx) was evaluated. Moreover, Bcl-2 and Bax's reactive proteins were immunohistochemically detected, and Zn and As residual patterns in hepatic tissues were assessed. Results ZNPs, ATO, and ZNPs+ATO-exposed rats showed significantly (P < 0.001) elevated serum AST (219%, 233%, and 333%), ALT (300%, 400%, and 475%), ALP (169%, 205%, and 294%), and total bilirubin (42%, 68%, and 109%) compared to the control ones. On the other hand, a significantly (P < 0.001) declined SOD (58%, 49%, and 43%) and GPx (70%, 63%, and 56%) but increased MDA (133%, 150%, and 224%) was recorded in the hepatic tissues of ZNPs, ATO, and ZNPs+ATO exposed rats, respectively, relative to the control rats. Moreover, the hepatic tissues of the ZNPs, ATO, and ZNPs+ATO exposed rats showed a significant (P < 0.001) decrease in Bcl-2 (28%, 33%, and 23%) but elevation in Bax (217%, 267%, and 236%) immunoreactivities compared to the control rats. These findings were consistent with the microscopic alterations in the hepatic architecture and accumulation of Zn and As. Furthermore, a notable hyperlipidemic condition was recorded following ZNPs and/or ATO exposure. On the contrary, GA notably reduced hepatic enzymes compared to ZNPs+ATO-exposed rats. Additionally, GA markedly improved ZNPs+ATO-afforded liver tissue damage and apoptotic events. Conclusion Overall, GA oral dosing significantly mitigated the negative effects of ZNPs and ATO on the liver by improving the antioxidant defense system and controlling apoptotic changes.
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Affiliation(s)
- Khaled Abo-EL-Sooud
- Department of Pharmacology, Faculty of Veterinary Medicine, Cairo University, Giza 12613, Egypt
| | - Yasmina M. Abd-El Hakim
- Department of Forensic Medicine and Toxicology, Faculty of Veterinary Medicine, Zagazig University, Zagazig 44519, Egypt
| | - Mohamed M.M. Hashem
- Department of Pharmacology, Faculty of Veterinary Medicine, Cairo University, Giza 12613, Egypt
| | - Abeer E. El-Metwally
- Pathology Department, Animal Reproduction Research Institute, Giza 3514805, Egypt
| | - Bayan A. Hassan
- Pharmacology Department, Faculty of Pharmacy, Future University, Cairo 11835, Egypt
| | - Hayat H.M. El-Nour
- Biology of Reproduction Department, Animal Reproduction Research Institute, Giza 3514805, Egypt
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Hall B, Levy S, Dufault-Thompson K, Ndjite GM, Weiss A, Braccia D, Jenkins C, Yang Y, Arp G, Abeysinghe S, Jermain M, Wu CH, Jiang X. Discovery of the gut microbial enzyme responsible for bilirubin reduction to urobilinogen. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.02.07.527579. [PMID: 36798240 PMCID: PMC9934709 DOI: 10.1101/2023.02.07.527579] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Abstract
The degradation of heme and the interplay of its catabolic derivative, bilirubin, between humans and their gut microbiota is an essential facet of human health. However, the hypothesized bacterial enzyme that reduces bilirubin to urobilinogen, a key step that produces the excretable waste products of this pathway, has remained unidentified. In this study, we used a combination of biochemical analyses and comparative genomics to identify a novel enzyme, BilR, that can reduce bilirubin to urobilinogen. We delineated the BilR sequences from other members of the Old Yellow Enzyme family through the identification of key residues in the active site that are critical for bilirubin reduction and found that BilR is predominantly encoded by Firmicutes in the gut microbiome. Our analysis of human gut metagenomes showed that BilR is a common feature of a healthy adult human microbiome but has a decreased prevalence in neonates and IBD patients. This discovery sheds new light on the role of the gut microbiome in bilirubin metabolism and highlights the significance of the gut-liver axis in maintaining bilirubin homeostasis.
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Affiliation(s)
- Brantley Hall
- Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, College Park, MD 20742, United States
- Center for Bioinformatics and Computational Biology, University of Maryland, College Park, College Park, MD 20742, United States
| | - Sophia Levy
- Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, College Park, MD 20742, United States
| | - Keith Dufault-Thompson
- National Library of Medicine, National Institutes of Health, Bethesda, MD 20894, United States
| | - Glory Minabou Ndjite
- Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, College Park, MD 20742, United States
| | - Ashley Weiss
- Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, College Park, MD 20742, United States
| | - Domenick Braccia
- Center for Bioinformatics and Computational Biology, University of Maryland, College Park, College Park, MD 20742, United States
| | - Conor Jenkins
- Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742, USA
| | - Yiyan Yang
- National Library of Medicine, National Institutes of Health, Bethesda, MD 20894, United States
| | - Gabi Arp
- Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, College Park, MD 20742, United States
| | - Stephenie Abeysinghe
- Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, College Park, MD 20742, United States
| | - Madison Jermain
- Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, College Park, MD 20742, United States
| | - Chih Hao Wu
- Program of Computational Biology, Bioinformatics, and Genomics, University of Maryland, College Park, MD 20742, United States
| | - Xiaofang Jiang
- National Library of Medicine, National Institutes of Health, Bethesda, MD 20894, United States
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Pelizzo P, Stebel M, Medic N, Sist P, Vanzo A, Anesi A, Vrhovsek U, Tramer F, Passamonti S. Cyanidin 3-glucoside targets a hepatic bilirubin transporter in rats. Biomed Pharmacother 2023; 157:114044. [PMID: 36463829 DOI: 10.1016/j.biopha.2022.114044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 11/15/2022] [Accepted: 11/25/2022] [Indexed: 12/02/2022] Open
Abstract
One of the organ-specific functions of the liver is the excretion of bilirubin into the bile. Membrane transport of bilirubin from the blood to the liver is not only an orphan function, because there is no link to the protein/gene units that perform this function, but also a poorly characterised function. The aim of this study was to investigate the pharmacology of bilirubin uptake in the liver of the female Wistar rat to improve basic knowledge in this neglected area of liver physiology. We treated isolated perfused livers of female rats with repeated single-pass, albumin-free bilirubin boli. We monitored both bilirubin and bilirubin glucuronide in perfusion effluent with a bio-fluorometric assay. We tested the ability of nine molecules known as substrates or inhibitors of sinusoidal membrane transporters to inhibit hepatic uptake of bilirubin. We found that cyanidin 3-glucoside and malvidin 3-glucoside were the only molecules that inhibited bilirubin uptake. These dietary anthocyanins resemble bromosulfophthalein (BSP), a substrate of several sinusoidal membrane transporters. The SLCO-specific substrates estradiol-17 beta-glucuronide, pravastatin, and taurocholate inhibited only bilirubin glucuronide uptake. Cyanidin 3-glucoside and taurocholate acted at physiological concentrations. The SLC22-specific substrates indomethacin and ketoprofen were inactive. We demonstrated the existence of a bilirubin-glucuronide transporter inhibited by bilirubin, a fact reported only once in the literature. The data suggest that bilirubin and bilirubin glucuronide are transported to the liver via pharmacologically distinct membrane transport pathways. Some dietary anthocyanins may physiologically modulate the uptake of bilirubin into the liver.
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Affiliation(s)
- Paola Pelizzo
- Department of Life Sciences, University of Trieste, Via L. Giorgieri 1, 34127 Trieste, Italy
| | - Marco Stebel
- Department of Life Sciences, University of Trieste, Via L. Giorgieri 1, 34127 Trieste, Italy
| | - Nevenka Medic
- Department of Life Sciences, University of Trieste, Via L. Giorgieri 1, 34127 Trieste, Italy
| | - Paola Sist
- Department of Life Sciences, University of Trieste, Via L. Giorgieri 1, 34127 Trieste, Italy
| | - Andreja Vanzo
- Department of Fruit Growing, Viticulture and Oenology, Agricultural Institute of Slovenia, Hacquetova ulica 17, SI-1000 Ljubljana, Slovenia
| | - Andrea Anesi
- Food Quality and Nutrition, Research and Innovation Centre, Edmund Mach Foundation, Via E. Mach 1, 38010 San Michele all'Adige, Italy
| | - Urska Vrhovsek
- Food Quality and Nutrition, Research and Innovation Centre, Edmund Mach Foundation, Via E. Mach 1, 38010 San Michele all'Adige, Italy
| | - Federica Tramer
- Department of Life Sciences, University of Trieste, Via L. Giorgieri 1, 34127 Trieste, Italy
| | - Sabina Passamonti
- Department of Life Sciences, University of Trieste, Via L. Giorgieri 1, 34127 Trieste, Italy.
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Abo-El-Sooud K, Abd-Elhakim YM, Hashem MMM, El-Metwally AE, Hassan BA, El-Nour HHM. Ameliorative effects of quercetin against hepatic toxicity of oral sub-chronic co-exposure to aluminum oxide nanoparticles and lead-acetate in male rats. NAUNYN-SCHMIEDEBERG'S ARCHIVES OF PHARMACOLOGY 2022; 396:737-747. [PMID: 36472630 PMCID: PMC10042903 DOI: 10.1007/s00210-022-02351-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2022] [Accepted: 11/24/2022] [Indexed: 12/12/2022]
Abstract
AbstractThe present study was designed to evaluate the probable ameliorative role of quercetin (QCN) against oxidative hepatotoxicity induced by aluminum oxide nanoparticles (Al2O3NPs) with a diameter < 30 nm and lead acetate (Pb) co-exposure in adult male Sprague–Dawley rats. Rats were weighed and allocated to seven groups (n = 10 each) and were treated orally via orogastric gavage for 60 successive days: rats of the 1st group were kept as control given distilled water (1 ml/kg), rats of the 2nd group received 2 ml/kg BW/day corn oil; rats of the 3rd group were administered 20 mg/kg BW QCN/day; rats of the 4th group received 100 mg/kg BW Al2O3NPs; rats of the 5th group received 50 mg/kg BW Pb; rats of the 6th group co-received Al2O3NPs and Pb at the same previous doses; and rats of the 7th group were co-administered Al2O3NPs, Pb, and QCN at the same previous doses. At the end of the experiment, serum levels of alkaline phosphatase (ALP), alanine aminotransferase (ALT), aspartate aminotransferase (AST), total, direct, indirect bilirubin, triglycerides, total cholesterol, HDL, VLDL, and LDL were estimated. The hepatic oxidative stress biomarkers as superoxide dismutase (SOD), malondialdehyde (MDA), and glutathione peroxidase (GPx), were also evaluated. Finally, the histopathological and histomorphometric evaluations and the residues of Al and Pb in hepatic tissues were assessed. Al2O3NPs and/or Pb exposure significantly elevated lipid peroxidation levels and considerably altered the hepatic biochemical parameters; nevertheless, QCN significantly reduced hepatic enzymes compared to toxicant exposed groups. Additionally, QCN significantly improved Al2O3NPs-afforded liver tissue damage, as established in microscopic findings on the liver in the group treated with Al2O3NPs + Pb. Conclusively, QCN could be a candidate natural agent to safeguard the liver versus the co-harmful impacts of Al2O3NPs and Pb toxicity.
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Affiliation(s)
- Khaled Abo-El-Sooud
- Department of Pharmacology, Faculty of Veterinary Medicine, Cairo University, Giza, Egypt
| | - Yasmina M Abd-Elhakim
- Department of Forensic Medicine and Toxicology, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt.
| | - Mohamed M M Hashem
- Department of Pharmacology, Faculty of Veterinary Medicine, Cairo University, Giza, Egypt
| | | | - Bayan A Hassan
- Pharmacology Department, Faculty of Pharmacy, Future University, Cairo, Egypt
| | - Hayat H M El-Nour
- Biology of Reproduction Department, Animal Reproduction Research Institute, Giza, Egypt
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Nocentini A, Bonardi A, Pratesi S, Gratteri P, Dani C, Supuran CT. Pharmaceutical strategies for preventing toxicity and promoting antioxidant and anti-inflammatory actions of bilirubin. J Enzyme Inhib Med Chem 2022; 37:487-501. [PMID: 34986721 PMCID: PMC8741241 DOI: 10.1080/14756366.2021.2020773] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Revised: 12/02/2021] [Accepted: 12/03/2021] [Indexed: 12/25/2022] Open
Abstract
Bilirubin (BR) is the final product of haem catabolism. Disruptions along BR metabolic/transport pathways resulting from inherited disorders can increase plasma BR concentration (hyperbilirubinaemia). Unconjugated hyperbilirubinemia may induce BR accumulation in brain, potentially causing irreversible neurological damage, a condition known as BR encephalopathy or kernicterus, to which newborns are especially vulnerable. Numerous pharmaceutical strategies, mostly based on hemoperfusion, have been proposed over the last decades to identify new valid, low-risk alternatives for BR removal from plasma. On the other hand, accumulating evidence indicates that BR produces health benefits due to its potent antioxidant, anti-inflammatory and immunomodulatory action with a significant potential for the treatment of a multitude of diseases. The present manuscript reviews both such aspects of BR pharmacology, gathering literature data on applied pharmaceutical strategies adopted to: (i) reduce the plasma BR concentration for preventing neurotoxicity; (ii) produce a therapeutic effect based on BR efficacy in the treatment of many disorders.
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Affiliation(s)
- Alessio Nocentini
- Department of Neurosciences, Psychology, Drug Research and Child Health, Pharmaceutical and Nutraceutical Section, University of Florence, Florence, Italy
| | - Alessandro Bonardi
- Department of Neurosciences, Psychology, Drug Research and Child Health, Pharmaceutical and Nutraceutical Section, University of Florence, Florence, Italy
| | - Simone Pratesi
- Department of Neurosciences, Psychology, Drug Research and Child Health, Careggi University, Hospital of Florence, Florence, Italy
| | - Paola Gratteri
- Department of Neurosciences, Psychology, Drug Research and Child Health, Pharmaceutical and Nutraceutical Section, Laboratory of Molecular Modelling Cheminformatics & QSAR, University of Florence, Florence, Italy
| | - Carlo Dani
- Department of Neurosciences, Psychology, Drug Research and Child Health, Careggi University, Hospital of Florence, Florence, Italy
| | - Claudiu T. Supuran
- Department of Neurosciences, Psychology, Drug Research and Child Health, Pharmaceutical and Nutraceutical Section, University of Florence, Florence, Italy
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Banerjee B, Olajide OJ, Bortolussi G, Muro AF. Activation of Alternative Bilirubin Clearance Pathways Partially Reduces Hyperbilirubinemia in a Mouse Model Lacking Functional Ugt1a1 Activity. Int J Mol Sci 2022; 23:ijms231810703. [PMID: 36142606 PMCID: PMC9505366 DOI: 10.3390/ijms231810703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Revised: 09/08/2022] [Accepted: 09/11/2022] [Indexed: 11/21/2022] Open
Abstract
Bilirubin is a heme catabolite and Ugt1a1 is the only enzyme involved in the biological elimination of bilirubin. Partially functional or non-functional Ugt1a1 may result in neuronal damage and death due to the accumulation of unconjugated bilirubin in the brain. The understanding of the role of alternative bilirubin detoxification mechanisms that can reduce bilirubin toxicity risk is crucial for developing novel therapeutic strategies. To provide a proof-of-principle showing whether activation of alternative detoxification pathways could lead to life-compatible bilirubin levels in the absence of Ugt1a1 activity, we used Ugt1−/− hyperbilirubinemic mice devoid of bilirubin glucuronidation activity. We treated adult Ugt1−/− mice with TCPOBOP, a strong agonist of the constitutive androstane receptor (CAR). TCPOBOP treatment decreased plasma and liver tissue bilirubin levels by about 38%, and resulted in the transcriptional activation of a vast array of genes involved in bilirubin transport and metabolism. However, brain bilirubin level was unaltered. We observed ~40% degradation of bilirubin in the liver microsomes from TCPOBOP treated Ugt1−/− mice. Our findings suggest that, in the absence of Ugt1a1, the activation of alternative bilirubin clearance pathways can partially improve hyperbilirubinemic conditions. This therapeutic approach may only be considered in a combinatorial manner along with other treatments.
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9
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Juarez VM, Montalbine AN, Singh A. Microbiome as an immune regulator in health, disease, and therapeutics. Adv Drug Deliv Rev 2022; 188:114400. [PMID: 35718251 PMCID: PMC10751508 DOI: 10.1016/j.addr.2022.114400] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 05/11/2022] [Accepted: 06/12/2022] [Indexed: 11/27/2022]
Abstract
New discoveries in drugs and drug delivery systems are focused on identifying and delivering a pharmacologically effective agent, potentially targeting a specific molecular component. However, current drug discovery and therapeutic delivery approaches do not necessarily exploit the complex regulatory network of an indispensable microbiota that has been engineered through evolutionary processes in humans or has been altered by environmental exposure or diseases. The human microbiome, in all its complexity, plays an integral role in the maintenance of host functions such as metabolism and immunity. However, dysregulation in this intricate ecosystem has been linked with a variety of diseases, ranging from inflammatory bowel disease to cancer. Therapeutics and bacteria have an undeniable effect on each other and understanding the interplay between microbes and drugs could lead to new therapies, or to changes in how existing drugs are delivered. In addition, targeting the human microbiome using engineered therapeutics has the potential to address global health challenges. Here, we present the challenges and cutting-edge developments in microbiome-immune cell interactions and outline novel targeting strategies to advance drug discovery and therapeutics, which are defining a new era of personalized and precision medicine.
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Affiliation(s)
- Valeria M Juarez
- Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University School of Medicine, Atlanta, GA, United States
| | - Alyssa N Montalbine
- Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University School of Medicine, Atlanta, GA, United States
| | - Ankur Singh
- Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University School of Medicine, Atlanta, GA, United States; Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, United States.
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10
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Chen YY, Chen WL. Serum Bilirubin and Sperm Quality in Adult Population. TOXICS 2022; 10:toxics10060295. [PMID: 35736904 PMCID: PMC9227271 DOI: 10.3390/toxics10060295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Revised: 05/20/2022] [Accepted: 05/26/2022] [Indexed: 02/04/2023]
Abstract
The neurotoxicity of bilirubin has been extensively reported in numerous studies. However, the association between bilirubin and male fertility has not yet been studied. The main goal of this study was to investigate the association between serum total bilirubin and sperm quality in an adult population. In this cross-sectional study, 9057 participants who attended the MJ health examination (2010–2016) were enrolled. Sperm specimens were collected by masturbation, and sperm quality was analyzed in accordance with the WHO criteria. Serum total bilirubin levels were measured by an automatic biochemical profile analyzer. Thereafter, the associations between serum total bilirubin and sperm quality were determined by a multivariable linear regression. Serum total bilirubin was inversely associated with sperm concentration and normal morphology with β values of −13.82 (95% CI: −26.99, −0.64) and −18.38 (95% CI: −30.46, −6.29) after adjusting for covariables. The highest levels of serum total bilirubin were significantly associated with sperm concentration and normal morphology with β values of −14.15 (95% CI: −28.36, 0.06) and −21.15 (95% CI: −33.99, −8.30). Our study highlighted the potential impact of serum bilirubin on sperm quality in a male population. Additional longitudinal research is necessary to explore these findings and underlying mechanisms.
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Affiliation(s)
- Yuan-Yuei Chen
- Department of Pathology, Tri-Service General Hospital, School of Medicine, National Defense Medical Center, Taipei 114, Taiwan;
- Department of Pathology, Tri-Service General Hospital Songshan Branch, School of Medicine, National Defense Medical Center, Taipei 114, Taiwan
| | - Wei-Liang Chen
- Division of Family Medicine, Department of Family and Community Medicine, Tri-Service General Hospital, School of Medicine, National Defense Medical Center, Taipei 114, Taiwan
- Division of Geriatric Medicine, Department of Family and Community Medicine, Tri-Service General Hospital, School of Medicine, National Defense Medical Center, Taipei 114, Taiwan
- Department of Biochemistry, National Defense Medical Center, Taipei,114, Taiwan
- Correspondence: ; Tel.: +886-2-87923311 (ext. 16567); Fax: +886-2-87927057
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11
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Basiglio CL, Crocenzi FA, Sánchez Pozzi EJ, Roma MG. Oxidative Stress and Localization Status of Hepatocellular Transporters: Impact on Bile Secretion and Role of Signaling Pathways. Antioxid Redox Signal 2021; 35:808-831. [PMID: 34293961 DOI: 10.1089/ars.2021.0021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Significance: Most hepatopathies are primarily or secondarily cholestatic in nature. Oxidative stress (OS) is a frequent trait among them, and impairs the machinery to generate bile by triggering endocytic internalization of hepatocellular transporters, thus causing cholestasis. This is critical, since it leads to accelerated transporter degradation, which could explain the common post-transcriptional downregulation of transporter expression in human cholestatic diseases. Recent Advances: The mechanisms involved in OS-induced hepatocellular transporter internalization are being revealed. Filamentous actin (F-actin) cytoskeleton disorganization and/or detachment of crosslinking actin proteins that afford transporter stability have been characterized as causal factors. Activation of redox-sensitive signaling pathways leading to changes in phosphorylation status of these structures is involved, including Ca2+-mediated activation of "classical" and "novel" protein kinase C (PKC) isoforms or redox-signaling cascades downstream of NADPH oxidase. Critical Issues: Despite the well-known occurrence of hepatocellular transporter internalization in human hepatopathies, the cholestatic implications of this phenomenon have been overlooked. Accordingly, no specific treatment has been established in the clinical practice for its prevention/reversion. Future Directions: We need to improve our knowledge on the pro-oxidant triggering factors and the multiple signaling pathways that mediate this oxidative injury in each cholestatic hepatopathy, so as to envisage tailor-made therapeutic strategies for each case. Meanwhile, administration of antioxidants or heme oxygenase-1 induction to elevate the hepatocellular levels of the endogenous scavenger bilirubin are promising alternatives that need to be re-evaluated and implemented. They may complement current treatments in cholestasis aimed to enhance transcriptional carrier expression, by providing membrane stability to the newly synthesized carriers. Antioxid. Redox Signal. 35, 808-831.
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Affiliation(s)
- Cecilia L Basiglio
- Instituto de Fisiología Experimental (IFISE), Facultad de Ciencias Bioquímicas y Farmacéuticas, CONICET, U.N.R., Rosario, Argentina
| | - Fernando A Crocenzi
- Instituto de Fisiología Experimental (IFISE), Facultad de Ciencias Bioquímicas y Farmacéuticas, CONICET, U.N.R., Rosario, Argentina
| | - Enrique J Sánchez Pozzi
- Instituto de Fisiología Experimental (IFISE), Facultad de Ciencias Bioquímicas y Farmacéuticas, CONICET, U.N.R., Rosario, Argentina
| | - Marcelo G Roma
- Instituto de Fisiología Experimental (IFISE), Facultad de Ciencias Bioquímicas y Farmacéuticas, CONICET, U.N.R., Rosario, Argentina
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12
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Boyer JL, Soroka CJ. Bile formation and secretion: An update. J Hepatol 2021; 75:190-201. [PMID: 33617926 DOI: 10.1016/j.jhep.2021.02.011] [Citation(s) in RCA: 51] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Revised: 01/28/2021] [Accepted: 02/08/2021] [Indexed: 12/11/2022]
Abstract
Bile formation is a fundamental physiological process that is vital to the survival of all vertebrates. However, little was known about the mechanisms of this secretion until after World War II. Initial studies involved classic physiologic studies in animal models and humans, which progressed to include studies in isolated cells and membrane vesicles. The advent of molecular biology then led to the identification of specific transport systems that are the determinants of this secretion. Progress in this field was reviewed in the American Physiologic Society's series on "Comprehensive Physiology" in 2013. Herein, we provide an in-depth update of progress since that time.
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Affiliation(s)
- James Lorenzen Boyer
- Department of Medicine and Liver Center, Yale University School of Medicine, New Haven, CT 06510, USA.
| | - Carol Jean Soroka
- Department of Medicine and Liver Center, Yale University School of Medicine, New Haven, CT 06510, USA
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13
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Thomas M, Hardikar W, Greaves RF, Tingay DG, Loh TP, Ignjatovic V, Newall F, Rajapaksa AE. Mechanism of bilirubin elimination in urine: insights and prospects for neonatal jaundice. Clin Chem Lab Med 2021; 59:1025-1033. [PMID: 33554547 DOI: 10.1515/cclm-2020-1759] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Accepted: 12/22/2020] [Indexed: 11/15/2022]
Abstract
Despite a century of research, bilirubin metabolism and the transport mechanisms responsible for homeostasis of bilirubin in serum remain controversial. Emerging evidence on the hepatic membrane transporters and inherited disorders of bilirubin metabolism have contributed to a greater understanding of the various steps involved in bilirubin homeostasis and its associated excretory pathways. We discuss these recent research findings on hepatic membrane transporters and evaluate their significance on the newborn bilirubin metabolism and excretion. New insights gained speculate that a proportion of conjugated bilirubin is excreted via the renal system, as an alternative to the intestinal excretion, even in normal physiological jaundice with no associated pathological concerns. Finally, this paper discusses the clinical relevance of targeting the altered renal excretory pathway, as bilirubin in urine may hold diagnostic importance in screening for neonatal jaundice.
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Affiliation(s)
- Mercy Thomas
- New Vaccines, Murdoch Children's Research Institute, Melbourne, Victoria, Australia.,Department of Paediatrics, University of Melbourne, Melbourne, Australia.,Newborn Research Centre, Royal Women's Hospital, Melbourne, Victoria, Australia.,Department of Nursing, Royal Children's Hospital, Melbourne, Victoria, Australia
| | - Winita Hardikar
- Department of Paediatrics, University of Melbourne, Melbourne, Australia.,Department of Gastroenterology, Royal Children's Hospital, Melbourne, Victoria, Australia.,Clinical Sciences, Murdoch Children's Research Institute, Melbourne, Victoria, Australia
| | - Ronda F Greaves
- Department of Paediatrics, University of Melbourne, Melbourne, Australia.,School of Health and Biomedical Sciences, RMIT University, Melbourne, Victoria, Australia.,Victorian Clinical Genetics Services, Melbourne, Victoria, Australia
| | - David G Tingay
- Department of Paediatrics, University of Melbourne, Melbourne, Australia.,Newborn Research Centre, Royal Women's Hospital, Melbourne, Victoria, Australia.,Neonatal Research, Murdoch Children's Research Institute, Melbourne, Victoria, Australia.,Department of Neonatology, Royal Children's Hospital, Melbourne, Victoria, Australia
| | - Tze Ping Loh
- Department of Laboratory Medicine, National University Hospital, Singapore, Singapore
| | - Vera Ignjatovic
- Department of Paediatrics, University of Melbourne, Melbourne, Australia.,Haematology Research, Murdoch Children's Research Institute, Melbourne, Victoria, Australia
| | - Fiona Newall
- Department of Paediatrics, University of Melbourne, Melbourne, Australia.,Department of Nursing, Royal Children's Hospital, Melbourne, Victoria, Australia
| | - Anushi E Rajapaksa
- New Vaccines, Murdoch Children's Research Institute, Melbourne, Victoria, Australia.,Department of Paediatrics, University of Melbourne, Melbourne, Australia.,Newborn Research Centre, Royal Women's Hospital, Melbourne, Victoria, Australia
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14
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Shiels RG, Hewage W, Vidimce J, Pearson AG, Grant G, Wagner KH, Bulmer AC. Pharmacokinetics of bilirubin-10-sulfonate and biliverdin in the rat. Eur J Pharm Sci 2020; 159:105684. [PMID: 33359481 DOI: 10.1016/j.ejps.2020.105684] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Revised: 11/22/2020] [Accepted: 12/16/2020] [Indexed: 11/29/2022]
Abstract
BACKGROUND AND PURPOSE Biliverdin (BV) administration induces antioxidant and anti-inflammatory effects, with previous reports also identifying anti-anaphylactic potential. Interestingly however, intra-duodenal administration of BV in rats leads to the formation of bilirubin-10-sulfonate (BRS), which might be responsible for BV's purported effects. EXPERIMENTAL APPROACH This study aimed to assess the intravenous, intraperitoneal and intraduodenal pharmacokinetics of BRS and BV in order to assess their therapeutic potential in future studies. Bile and venous blood were intermittently collected before and after administration, which was subsequently analysed using liquid chromatography-mass spectrometry for quantification of bile pigment concentrations. KEY RESULTS Interestingly, i.p. BRS administration led to a greater circulating concentration and had a reduced excretion rate, which resulted in a substantially elevated AUC180 when compared to BV administration. Furthermore, BRS was excreted intact in the bile, in contrast to BV which was excreted after chemical reduction and conjugation. Intraperitoneal and intraduodenal administration substantially increased blood BRS concentrations (p<0.05), however, the bioavailability of BV was higher than BRS following i.p. administration (i.p. BV 28.4%, BRS 15.5%) but lower following i.d. administration (i.d. BV 0.04%, BRS 0.07%), over 180 minutes. When BRS was administered i.v., BRS had a significantly (p<0.05) longer distribution (191.9 vs 54.1 minutes) half-life compared to BV, and significantly reduced (p<0.05) volume of distribution (0.026 vs 0.145 L kg-1). As a consequence, intraperitoneal and intraduodenal administration resulted in significantly greater blood concentrations of BRS (p<0.05) over 180 minutes. Therefore, BRS may be more likely to induce antioxidant or molecular effects, when compared to BV, due to greater concentrations and a longer half-life. CONCLUSIONS AND IMPLICATIONS Cumulatively, these data demonstrate that BRS has a superior pharmacokinetic profile when compared to BV, which is a result of its resistance to hepatic metabolism and excretion. These data therefore provide a basis to explore the capacity of BRS to protect from inflammatory pathology.
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Affiliation(s)
| | | | | | | | - Gary Grant
- School of Pharmacy and Pharmacology and Menzies Health Institute Queensland, Griffith University, Gold Coast, Queensland, Australia
| | - Karl-Heinz Wagner
- Department of Nutritional Sciences, University of Vienna, Vienna, Austria
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15
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Effects of stress-induced increases of corticosterone on circulating triglyceride levels, biliverdin concentration, and heme oxygenase expression. Comp Biochem Physiol A Mol Integr Physiol 2020; 240:110608. [DOI: 10.1016/j.cbpa.2019.110608] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Revised: 10/30/2019] [Accepted: 10/30/2019] [Indexed: 12/13/2022]
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16
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Huang S, Zheng J, Zhang Y, Zheng J, Zhuang Z, Yang Q, Wang F, Chen G, Huang S, Ouyang G. Polydopamine decorated ordered mesoporous carbon for efficient removal of bilirubin under albumin-rich conditions. J Mater Chem B 2019; 8:290-297. [PMID: 31803882 DOI: 10.1039/c9tb02147g] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Excess bilirubin in the body will lead to serious health problems; however, its efficient removal remains a challenge in the clinical field because the available sorbent materials still suffer from serious performance issues, performance declining in a high-content albumin environment. Herein, we prepared a novel polydopamine (PDA) decorated ordered mesoporous carbon (OMC) material for the efficient removal of bilirubin in albumin-rich conditions. OMC was used as the supporting material due to its high specific surface area and its good affinity to hydrophobic analytes. PDA was then decorated on the OMC material through a facile self-assembly process to form a surface-imprinted layer. The obtained PDA-coated OMC material (OMC@PDA) exhibited excellent adsorption performance towards bilirubin in albumin-free conditions, in which its theoretical maximum adsorption amount was calculated to be 513.54 mg g-1. The imprinted PDA layer, for which the association constant towards bilirubin reached 4.51 × 104 M-1, endowed OMC@PDA with a competitive affinity compared to albumin. Therefore the materials showed good adsorption capacity and efficiency even in an albumin-rich environment (the adsorption equilibrated at 122.7 mg g-1 in 30 min). In addition, the good biocompatibility of OMC@PDA was demonstrated by hemolysis assay and protein fouling evaluation, which indicated the feasibility of applying this material in clinical situations.
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Affiliation(s)
- Shuyao Huang
- KLGHEI of Environment and Energy Chemistry, School of Chemistry, Sun Yat-sen University, Guangzhou, Guangdong 510275, China.
| | - Jiating Zheng
- KLGHEI of Environment and Energy Chemistry, School of Chemistry, Sun Yat-sen University, Guangzhou, Guangdong 510275, China.
| | - Yimin Zhang
- Nephrology Department, Sun Yat-sen University Sixth Affiliated Hospital, Guangzhou, Guangdong 510000, China
| | - Juan Zheng
- KLGHEI of Environment and Energy Chemistry, School of Chemistry, Sun Yat-sen University, Guangzhou, Guangdong 510275, China.
| | - Zena Zhuang
- KLGHEI of Environment and Energy Chemistry, School of Chemistry, Sun Yat-sen University, Guangzhou, Guangdong 510275, China.
| | - Qian Yang
- KLGHEI of Environment and Energy Chemistry, School of Chemistry, Sun Yat-sen University, Guangzhou, Guangdong 510275, China.
| | - Fuxin Wang
- KLGHEI of Environment and Energy Chemistry, School of Chemistry, Sun Yat-sen University, Guangzhou, Guangdong 510275, China.
| | - Guosheng Chen
- KLGHEI of Environment and Energy Chemistry, School of Chemistry, Sun Yat-sen University, Guangzhou, Guangdong 510275, China.
| | - Siming Huang
- Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics, Sun Yat-sen Memorial Hospital, Guangzhou, Guangdong 510120, China
| | - Gangfeng Ouyang
- KLGHEI of Environment and Energy Chemistry, School of Chemistry, Sun Yat-sen University, Guangzhou, Guangdong 510275, China. and Guangdong Provincial Key Laboratory of Emergency Test for Dangerous Chemicals, Guangdong Institute of Analysis (China National Analytical Center Guangzhou), Guangzhou 510070, China
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17
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Pennell EN, Shiels R, Vidimce J, Wagner KH, Shibeeb S, Bulmer AC. The impact of bilirubin ditaurate on platelet quality during storage. Platelets 2019; 31:884-896. [PMID: 31747815 DOI: 10.1080/09537104.2019.1693038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Bilirubin ditaurate (BRT), a conjugated bilirubin analogue, has demonstrated anti-platelet characteristics following acute ex vivo exposure. Scavenging of mitochondrial superoxide and attenuation of granule exocytosis suggested a potential benefit for including BRT for storage. With no reports of cytotoxicity following acute exposure, the impact of 35µM BRT on platelet function was investigated, in clinically suppled units, for up to seven days. Exposure to 35µM BRT significantly reduced mitochondrial membrane potential and increased glucose consumption until exhaustion after 72 hours. Platelet aggregation and activation was significantly impaired by BRT. Mitochondrial superoxide production and phosphatidylserine expression were significantly elevated following glucose exhaustion, with decreased viability observed from day five onwards. Lactate accumulation and loss of bicarbonate, support a metabolic disturbance, leading to a decline of quality following BRT inclusion. Although acute ex vivo BRT exposure reported potentially beneficial effects, translation from acute to chronic exposure failed to combat declining platelet function during storage. BRT exposure resulted in perturbations of platelet quality, with the utility of BRT during storage therefore limited. However, these are the first data of prolonged platelet exposure to analogues of conjugated bilirubin and may improve our understanding of platelet function in the context of conjugated hyperbilirubinemia.
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Affiliation(s)
- Evan Noel Pennell
- School of Medical Science, Griffith University , Gold Coast, Australia
| | - Ryan Shiels
- School of Medical Science, Griffith University , Gold Coast, Australia
| | - Josif Vidimce
- School of Medical Science, Griffith University , Gold Coast, Australia
| | - Karl-Heinz Wagner
- Research Platform Active Aging, Department of Nutritional Science, University of Vienna , Vienna Austria
| | - Sapha Shibeeb
- School of Medical Science, Griffith University , Gold Coast, Australia.,Endeavour College of Natural Health , Melbourne, Australia
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18
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Pennell EN, Wagner KH, Mosawy S, Bulmer AC. Acute bilirubin ditaurate exposure attenuates ex vivo platelet reactive oxygen species production, granule exocytosis and activation. Redox Biol 2019; 26:101250. [PMID: 31226648 PMCID: PMC6586953 DOI: 10.1016/j.redox.2019.101250] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2019] [Revised: 06/07/2019] [Accepted: 06/08/2019] [Indexed: 12/19/2022] Open
Abstract
Background Bilirubin, a by-product of haem catabolism, possesses potent endogenous antioxidant and platelet inhibitory properties. These properties may be useful in inhibiting inappropriate platelet activation and ROS production; for example, during storage for transfusion. Given the hydrophobicity of unconjugated bilirubin (UCB), we investigated the acute platelet inhibitory and ROS scavenging ability of a water-soluble bilirubin analogue, bilirubin ditaurate (BRT) on ex vivo platelet function to ascertain its potential suitability for inclusion during platelet storage. Methods The inhibitory potential of BRT (10–100 μM) was assessed using agonist induced platelet aggregation, dense granule exocytosis and flow cytometric analysis of P-selectin and GPIIb/IIIa expression. ROS production was investigated by analysis of H2DCFDA fluorescence following agonist simulation while mitochondrial ROS production investigated using MitoSOX™ Red. Platelet mitochondrial membrane potential and viability was assessed using TMRE and Zombie Green™ respectively. Results Our data shows ≤35 μM BRT significantly inhibits both dense and alpha granule exocytosis as measured by ATP release and P-selectin surface expression, respectively. Significant inhibition of GPIIb/IIIa expression was also reported upon ≤35 μM BRT exposure. Furthermore, platelet exposure to ≤10 μM BRT significantly reduces platelet mitochondrial ROS production. Despite the inhibitory effect of BRT, platelet viability, mitochondrial membrane potential and agonist induced aggregation were not perturbed. Conclusions These data indicate, for the first time, that BRT, a water-soluble bilirubin analogue, inhibits platelet activation and reduces platelet ROS production ex vivo and may, therefore, may be of use in preserving platelet function during storage. The impact of conjugated bilirubin on platelet function has not been investigated to date. Bilirubin ditaurate (BDT) is a water-soluble analogue of conjugated bilirubin. BDT attenuates ex vivo platelet activation and ROS generation. Conjugated forms of bilirubin might inhibit platelet activation during storage.
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Affiliation(s)
- Evan Noel Pennell
- School of Medical Science, Griffith University, Gold Coast, Australia
| | - Karl-Heinz Wagner
- Research Platform Active Aging, Department of Nutritional Science, University of Vienna, Austria.
| | - Sapha Mosawy
- School of Medical Science, Griffith University, Gold Coast, Australia; Endeavour College of Natural Health, Melbourne, Australia
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19
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Venko K, Novič M. An In Silico Approach for Assessment of the Membrane Transporter Activities of Phenols: A Case Study Based on Computational Models of Transport Activity for the Transporter Bilitranslocase. Molecules 2019; 24:E837. [PMID: 30818768 PMCID: PMC6429229 DOI: 10.3390/molecules24050837] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Revised: 02/19/2019] [Accepted: 02/26/2019] [Indexed: 12/03/2022] Open
Abstract
Phenols are the most abundant naturally accessible antioxidants present in a human normal diet. Since numerous beneficial applications of phenols as preventive agents in various diseases were revealed, the evaluation of phenols bioavailability is of high interest of researchers, consumers and drug manufacturers. The hydrophilic nature of phenols makes a cell membrane penetration difficult, which imply an alternative way of uptake via membrane transporters. However, the structural and functional data of membrane transporters are limited, thus the in silico modelling is really challenging and urgent tool in elucidation of transporter ligands. Focus of this research was a particular transporter bilitranslocase (BTL). BTL has a broad tissue expression (vascular endothelium, absorptive and excretory epithelia) and can transport wide variety of poly-aromatic compounds. With available BTL data (pKi [mmol/L] for 120 organic compounds) a robust and reliable QSAR models for BTL transport activity were developed and extrapolated on 300 phenolic compounds. For all compounds the transporter profiles were assessed and results show that dietary phenols and some drug candidates are likely to interact with BTL. Moreover, synopsis of predictions from BTL models and hits/predictions of 20 transporters from Metrabase and Chembench platforms were revealed. With such joint transporter analyses a new insights for elucidation of BTL functional role were acquired. Regarding limitation of models for virtual profiling of transporter interactions the computational approach reported in this study could be applied for further development of reliable in silico models for any transporter, if in vitro experimental data are available.
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Affiliation(s)
- Katja Venko
- Laboratory for Cheminformatics, Theory Department, National Institute of Chemistry, SI-1000 Ljubljana, Slovenia.
| | - Marjana Novič
- Laboratory for Cheminformatics, Theory Department, National Institute of Chemistry, SI-1000 Ljubljana, Slovenia.
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20
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Bilirubin and Ischemic Stroke: Rendering the Current Paradigm to Better Understand the Protective Effects of Bilirubin. Mol Neurobiol 2019; 56:5483-5496. [PMID: 30612336 DOI: 10.1007/s12035-018-1440-y] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Accepted: 11/21/2018] [Indexed: 01/14/2023]
Abstract
Novel and innovative methods are critical in fostering new treatments and improving clinical outcomes in patients who suffer from ischemic stroke. Bilirubin has long been considered metabolic waste that can be harmful to the body; however, it is now becoming recognized as one of the body's most potent antioxidant, anti-inflammatory, and neuroprotective molecules. These properties facilitate bilirubin's anti-atherogenic effects to impede and prevent the formation of thrombi in ischemic stroke. These functions allow for protection from neuronal injury during an ischemic state and suggest that elevated bilirubin levels may be linked to a lower rate of morbidity and mortality. Therefore, here we discuss the pathophysiology of stroke and the molecular properties of bilirubin to better understand their beneficial relationship. We outline clinical studies looking at the relationship between serum bilirubin levels and ischemic stroke prevalence. At this time, few studies have rigorously looked at the relationship between bilirubin and ischemic stroke, whether it is positive or negative. Thus, rigorous research is needed to provide evidence supporting the current studies, expand on these studies, and facilitate their translation to bedside therapy for patients who suffer from ischemic stroke.
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21
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Boxberger KH, Hagenbuch B, Lampe JN. Ligand-dependent modulation of hOCT1 transport reveals discrete ligand binding sites within the substrate translocation channel. Biochem Pharmacol 2018; 156:371-384. [PMID: 30138624 PMCID: PMC6195816 DOI: 10.1016/j.bcp.2018.08.028] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Accepted: 08/17/2018] [Indexed: 12/18/2022]
Abstract
The human hepatic organic cation transporter 1 (hOCT1) is a well-known transporter of both xenobiotic and endogenous cations. The substrates and inhibitors of hOCT1 are structurally and physiochemically diverse and include some widely prescribed drugs (metformin and imatinib), vitamins (thiamine), and neurotransmitters (serotonin). It has been demonstrated that the closely related renal isoform, hOCT2, is subject to ligand-dependent modulation, wherein one ligand may enhance or inhibit transport of a second, chemically unrelated, ligand. This phenomenon has important implications for drug-drug interactions due to the ubiquity of polypharmacy and the large number of drugs that are present as cations under physiological conditions. Therefore, the objective of this study was to determine if hOCT1 is subject to the same ligand-dependent modulation as hOCT2, and to identify unique putative ligand binding sites in the translocation channel for a sub-set of ligands using computational modeling. The competitive counter flow (CCF) assay was employed to examine ligand-dependent effects by utilizing four different radiolabeled probe substrates: MPP+, serotonin, metformin, and TEA. We identified 20 ligands that modulated the transport of the four test substrates examined. One of the putative ligands identified, BSP, is an anion at physiological pH. Direct uptake studies of radiolabeled BSP suggested that it is a hOCT1 substrate with a Km of 13.6 ± 2.6 µM and Vmax of 55.1 ± 4.1 pmol/mg protein/min. Each ligand identified was computationally docked into a homology model of hOCT1 using the UCSF DOCK software package. The docking study revealed three separate ligand binding pockets within the hOCT1 translocation pathway, defined by their interactions with three prototypical substrates: MPP+, TEA, and acyclovir. Our results suggest that hOCT1 is not only subject to ligand-dependent modulation, but also that individual ligand binding occurs at discrete sites within the hOCT1 translocation pathway which may influence ligand binding at the other sites.
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Affiliation(s)
- Kelli H Boxberger
- Department of Pharmacology, Toxicology and Therapeutics, The University of Kansas Medical Center, Kansas City, KS 66160, United States
| | - Bruno Hagenbuch
- Department of Pharmacology, Toxicology and Therapeutics, The University of Kansas Medical Center, Kansas City, KS 66160, United States; The University of Kansas Cancer Center, Kansas City, KS 66160, United States; The University of Kansas Liver Center, Kansas City, KS 66160, United States
| | - Jed N Lampe
- Department of Pharmacology, Toxicology and Therapeutics, The University of Kansas Medical Center, Kansas City, KS 66160, United States; The University of Kansas Liver Center, Kansas City, KS 66160, United States.
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