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Oezguen N, Yılmaz V, Horvath TD, Akbayir E, Haidacher SJ, Hoch KM, Thapa S, Palacio J, Türkoğlu R, Kürtüncü M, Engevik MA, Versalovic J, Haag AM, Tüzün E. Serum 3-phenyllactic acid level is reduced in benign multiple sclerosis and is associated with effector B cell ratios. Mult Scler Relat Disord 2022; 68:104239. [PMID: 36279598 DOI: 10.1016/j.msard.2022.104239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Revised: 08/24/2022] [Accepted: 10/09/2022] [Indexed: 11/06/2022]
Abstract
BACKGROUND 3-phenyllactic acid (PLA) is produced by both intestinal bacteria and the human host. PLA exists in its D- and L- chiral forms. It modulates human immune functions, thereby acting as a mediator of bacterial-host interactions. We aim to determine the amount and potential influence of PLA on clinical and immunological features of MS. METHODS We measured D- and L-PLA levels in bacterial supernatants and in sera of 60 MS patients and 25 healthy controls. We investigated potential associations between PLA levels, clinical features of MS, serum cytokine levels and ratios of peripheral blood lymphocyte subsets. RESULTS Multiple gut commensal bacteria possessed the capacity to generate D- and L-PLA. MS patients with benign phenotype showed markedly lower PLA levels than healthy controls or other MS patients. Fingolimod resistant patients had higher PLA levels at baseline. Furthermore, MS patients with higher PLA levels tended to display increased memory B and plasma cell ratios, elevated IL-4 levels and increased ratios of IL-4 and IL-10 producing T cell subsets. CONCLUSION Collectively, our work indicates that reduced serum levels of PLA could be associated with a favorable clinical course in MS and possibly be used as a biomarker.
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Affiliation(s)
- Numan Oezguen
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX, USA; Department of Pathology, Texas Children's Hospital, Houston, TX, USA.
| | - Vuslat Yılmaz
- Department of Neuroscience, Aziz Sancar Institute of Experimental Medicine, Istanbul University, Istanbul, Turkey
| | - Thomas D Horvath
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX, USA; Department of Pathology, Texas Children's Hospital, Houston, TX, USA
| | - Ece Akbayir
- Department of Neuroscience, Aziz Sancar Institute of Experimental Medicine, Istanbul University, Istanbul, Turkey
| | - Sigmund J Haidacher
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX, USA; Department of Pathology, Texas Children's Hospital, Houston, TX, USA
| | - Kathleen M Hoch
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX, USA; Department of Pathology, Texas Children's Hospital, Houston, TX, USA
| | - Santosh Thapa
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX, USA; Department of Pathology, Texas Children's Hospital, Houston, TX, USA
| | - Jeremy Palacio
- Department of Forensic Science, Saint Louis University, St. Louis, MO, USA
| | - Recai Türkoğlu
- Department of Neurology, Istanbul Haydarpasa Numune Training and Research Hospital, Istanbul, Turkey
| | - Murat Kürtüncü
- Department of Neurology, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey
| | - Melinda A Engevik
- Department of Regenerative Medicine & Cell Biology, Medical University of South Carolina, Charleston, SC, USA
| | - James Versalovic
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX, USA; Department of Pathology, Texas Children's Hospital, Houston, TX, USA
| | - Anthony M Haag
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX, USA; Department of Pathology, Texas Children's Hospital, Houston, TX, USA
| | - Erdem Tüzün
- Department of Neuroscience, Aziz Sancar Institute of Experimental Medicine, Istanbul University, Istanbul, Turkey
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2
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Horvath TD, Poventud-Fuentes I, Olayinka L, James A, Haidacher SJ, Hoch KM, Stevens AM, Haag AM, Devaraj S. Validation of atovaquone plasma levels by liquid chromatography-tandem mass spectrometry for therapeutic drug monitoring in pediatric patients. J Mass Spectrom Adv Clin Lab 2022; 26:23-27. [PMID: 36388060 PMCID: PMC9641598 DOI: 10.1016/j.jmsacl.2022.09.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Revised: 09/09/2022] [Accepted: 09/09/2022] [Indexed: 11/23/2022] Open
Abstract
Atovaquone, an antiparasitic and antifungal, has potential as an anticancer agent. Our LC-MS/MS-based method can accurately quantify atovaquone in plasma. Low LOQ and small sample volume requirements add versatility to our method. Measuring atovaquone in plasma helps to determine the effective dose in children.
Background Atovaquone has traditionally been used as an antiparasitic and antifungal agent, but recent studies have shown its potential as an anticancer agent. The high variability in atovaquone bioavailability highlights the need for therapeutic drug monitoring, especially in pediatric patients. The goal of our study was to develop and validate the performance of an assay to quantify atovaquone plasma concentrations collected from pediatric cancer patients using LC-MS/MS. Methods Atovaquone was extracted from a 10 µL volume of K2-EDTA human plasma using a solution consisting of ACN: EtOH: DMF (8:1:1 v:v:v), separated using reverse-phase chromatography, and detected using a SCIEX 5500 QTrap MS system. LC-MS/MS assay performance was evaluated for precision, accuracy, carryover, sensitivity, specificity, linearity, and interferences. Results Atovaquone and its deuterated internal standard were analyzed using a gradient chromatographic method that had an overall cycle-time of 7.4 min per injection, and retention times of 4.3 min. Atovaquone was measured over a dynamic concentration range of 0.63 – 80 µM with a deviation within ≤ ± 5.1 % of the target value. Intra- and inter-assay precision were ≤ 2.7 % and ≤ 8.4 %, respectively. Dilutional, carryover, and interference studies were also within acceptable limits. Conclusions Our studies have shown that our LC-MS/MS-based method is both reliable and robust for the quantification of plasma atovaquone concentrations and can be used to determine the effective dose of atovaquone for pediatric patients treated for AML.
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Affiliation(s)
- Thomas D. Horvath
- Department of Pathology and Immunology, Baylor College of Medicine, and Department of Pathology, Texas Children’s Hospital, Houston, TX, USA
| | - Izmarie Poventud-Fuentes
- Department of Pathology and Immunology, Baylor College of Medicine, and Department of Pathology, Texas Children’s Hospital, Houston, TX, USA
| | - Lily Olayinka
- Department of Pathology and Immunology, Baylor College of Medicine, and Department of Pathology, Texas Children’s Hospital, Houston, TX, USA
| | - Asha James
- Department of Pathology and Immunology, Baylor College of Medicine, and Department of Pathology, Texas Children’s Hospital, Houston, TX, USA
| | - Sigmund J. Haidacher
- Department of Pathology and Immunology, Baylor College of Medicine, and Department of Pathology, Texas Children’s Hospital, Houston, TX, USA
| | - Kathleen M. Hoch
- Department of Pathology and Immunology, Baylor College of Medicine, and Department of Pathology, Texas Children’s Hospital, Houston, TX, USA
| | - Alexandra M. Stevens
- Department of Pediatric Hematology/Oncology, Baylor College of Medicine/Texas Children's Hospital, Houston, TX, USA
| | - Anthony M. Haag
- Department of Pathology and Immunology, Baylor College of Medicine, and Department of Pathology, Texas Children’s Hospital, Houston, TX, USA
| | - Sridevi Devaraj
- Department of Pathology and Immunology, Baylor College of Medicine, and Department of Pathology, Texas Children’s Hospital, Houston, TX, USA
- Corresponding author.
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3
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Blackman AC, Thapa S, Venkatachalam A, Horvath TD, Runge JK, Haidacher SJ, Hoch KM, Haag AM, Luna RA, Anagnostou A. Insights into Microbiome and Metabolic Signatures of Children Undergoing Peanut Oral Immunotherapy. Children 2022; 9:children9081192. [PMID: 36010081 PMCID: PMC9406383 DOI: 10.3390/children9081192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/19/2022] [Revised: 07/15/2022] [Accepted: 07/25/2022] [Indexed: 11/16/2022]
Abstract
Background: Peanut oral immunotherapy has emerged as a novel, active management approach for peanut-allergic sufferers, but limited data exist currently on the role of the microbiome in successful desensitization. Objective: We examined the oral and gut microbiome in a cohort of 17 children undergoing peanut oral immunotherapy with the aim to identify the microbiome signatures associated with successful desensitization. We also set out to characterize their fecal metabolic profiles after successful therapy. Methods: Participants gradually built up their daily dose from 2 mg (starting dose) to 300 mg (maintenance dose) within approximately 40 weeks. We collected a buccal and stool specimen from each subject at two different time points: at baseline and post-therapy (1 month after reaching maintenance). The oral (buccal) and gut (fecal) microbiome was characterized based on sequencing of 16S rRNA gene amplicons with Illumina MiSeq. Fecal short chain fatty acid levels were measured using liquid chromatography-tandem mass spectrometry. Results: We report increased alpha diversity of the oral microbiome post-therapy and have also identified a significant increase in the relative abundance of oral Actinobacteria, associated with the desensitized state. However, the baseline gut microbiome did not differ from the post-therapy. Additionally, fecal short chain fatty acids increased after therapy, but not significantly. Conclusion: Our research adds to the limited current knowledge on microbiome and metabolic signatures in pediatric patients completing oral immunotherapy. Post-therapy increased trends of fecal fatty acid levels support a role in modulating the allergic response and potentially exerting protective and anti-inflammatory effects alongside successful desensitization. A better understanding of the microbiome-related mechanisms underlying desensitization may allow development of smarter therapeutic approaches in the near future. Clinical implication: The oral microbiome composition is altered following successful peanut oral immunotherapy, with a significant increase in alpha diversity and the relative abundance of phylum Actinobacteria. Capsule summary: Significant microbiome changes in children completing peanut immunotherapy include increase in alpha-diversity and overrepresentation of Actinobacteria in the oral microbiome, and increased trends for fecal short chain fatty acids, suggesting a protective effect against the allergic response.
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Affiliation(s)
- Andrea C. Blackman
- Department of Pediatrics, Section of Immunology, Allergy and Retrovirology, Texas Children’s Hospital, Houston, TX 77030, USA
- Section of Allergy, Immunology & Retrovirology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Santosh Thapa
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX 77030, USA
- Texas Children’s Microbiome Center, Department of Pathology, Texas Children’s Hospital, Houston, TX 77030, USA
| | - Alamelu Venkatachalam
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX 77030, USA
- Texas Children’s Microbiome Center, Department of Pathology, Texas Children’s Hospital, Houston, TX 77030, USA
| | - Thomas D. Horvath
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX 77030, USA
- Texas Children’s Microbiome Center, Department of Pathology, Texas Children’s Hospital, Houston, TX 77030, USA
| | - Jessica K. Runge
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX 77030, USA
- Texas Children’s Microbiome Center, Department of Pathology, Texas Children’s Hospital, Houston, TX 77030, USA
| | - Sigmund J. Haidacher
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX 77030, USA
- Texas Children’s Microbiome Center, Department of Pathology, Texas Children’s Hospital, Houston, TX 77030, USA
| | - Kathleen M. Hoch
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX 77030, USA
- Texas Children’s Microbiome Center, Department of Pathology, Texas Children’s Hospital, Houston, TX 77030, USA
| | - Anthony M. Haag
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX 77030, USA
- Texas Children’s Microbiome Center, Department of Pathology, Texas Children’s Hospital, Houston, TX 77030, USA
| | - Ruth Ann Luna
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX 77030, USA
- Texas Children’s Microbiome Center, Department of Pathology, Texas Children’s Hospital, Houston, TX 77030, USA
| | - Aikaterini Anagnostou
- Department of Pediatrics, Section of Immunology, Allergy and Retrovirology, Texas Children’s Hospital, Houston, TX 77030, USA
- Section of Allergy, Immunology & Retrovirology, Baylor College of Medicine, Houston, TX 77030, USA
- Correspondence: ; Tel.: +1-832-824-1319
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4
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Horvath TD, Ihekweazu FD, Haidacher SJ, Ruan W, Engevik KA, Fultz R, Hoch KM, Luna RA, Oezguen N, Spinler JK, Haag AM, Versalovic J, Engevik MA. Bacteroides ovatus colonization influences the abundance of intestinal short chain fatty acids and neurotransmitters. iScience 2022; 25:104158. [PMID: 35494230 PMCID: PMC9038548 DOI: 10.1016/j.isci.2022.104158] [Citation(s) in RCA: 38] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 11/01/2021] [Accepted: 03/23/2022] [Indexed: 12/18/2022] Open
Abstract
Gut microbes can synthesize multiple neuro-active metabolites. We profiled neuro-active compounds produced by the gut commensal Bacteroides ovatus in vitro and in vivo by LC-MS/MS. We found that B. ovatus generates acetic acid, propionic acid, isobutyric acid, and isovaleric acid. In vitro, B. ovatus consumed tryptophan and glutamate and synthesized the neuro-active compounds glutamine and GABA. Consistent with our LC-MS/MS-based in vitro data, we observed elevated levels of acetic acid, propionic acid, isobutyric acid, and isovaleric acid in the intestines of B. ovatus mono-associated mice compared with germ-free controls. B. ovatus mono-association also increased the concentrations of intestinal GABA and decreased the concentrations of tryptophan and glutamine compared with germ-free controls. Computational network analysis revealed unique links between SCFAs, neuro-active compounds, and colonization status. These results highlight connections between microbial colonization and intestinal neurotransmitter concentrations, suggesting that B. ovatus selectively influences the presence of intestinal neurotransmitters.
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Affiliation(s)
- Thomas D. Horvath
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA
- Department of Pathology, Texas Children’s Hospital, Houston, TX, USA
| | - Faith D. Ihekweazu
- Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
- Section of Gastroenterology, Hepatology, and Nutrition, Texas Children’s Hospital, Houston, TX, USA
| | - Sigmund J. Haidacher
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA
- Department of Pathology, Texas Children’s Hospital, Houston, TX, USA
| | - Wenly Ruan
- Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
- Section of Gastroenterology, Hepatology, and Nutrition, Texas Children’s Hospital, Houston, TX, USA
| | - Kristen A. Engevik
- Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, TX, USA
| | - Robert Fultz
- Department of Neuroscience, Cell Biology, and Anatomy, University of Texas Medical Branch, Galveston, TX, USA
| | - Kathleen M. Hoch
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA
- Department of Pathology, Texas Children’s Hospital, Houston, TX, USA
| | - Ruth Ann Luna
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA
- Department of Pathology, Texas Children’s Hospital, Houston, TX, USA
| | - Numan Oezguen
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA
- Department of Pathology, Texas Children’s Hospital, Houston, TX, USA
| | - Jennifer K. Spinler
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA
- Department of Pathology, Texas Children’s Hospital, Houston, TX, USA
| | - Anthony M. Haag
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA
- Department of Pathology, Texas Children’s Hospital, Houston, TX, USA
| | - James Versalovic
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA
- Department of Pathology, Texas Children’s Hospital, Houston, TX, USA
| | - Melinda A. Engevik
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA
- Department of Regenerative Medicine & Cell Biology, Medical University of South Carolina, 173 Ashley Ave, BSB 621, Charleston, SC 29425, USA
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5
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Horvath TD, Haidacher SJ, Hoch KM, Engevik MA, Haag AM, Engevik AC. Using targeted LC‐MS/MS‐based metabolomics to measure a broad constellation of bile acids/salts in disorders of human health. FASEB J 2022. [DOI: 10.1096/fasebj.2022.36.s1.r4143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Thomas D. Horvath
- Department of Pathology and ImmunologyBaylor College of MedicineHoustonTX
- Department of PathologyBaylor College of MedicineHoustonTX
| | - Sigmund J. Haidacher
- Department of Pathology and ImmunologyBaylor College of MedicineHoustonTX
- Department of PathologyBaylor College of MedicineHoustonTX
| | - Kathleen M. Hoch
- Department of Pathology and ImmunologyBaylor College of MedicineHoustonTX
- Department of PathologyBaylor College of MedicineHoustonTX
| | - Melinda A. Engevik
- Department of Regenerative Medicine and Cell BiologyMedical University of South CarolinaCharlestonSC
| | - Anthony M. Haag
- Department of Pathology and ImmunologyBaylor College of MedicineHoustonTX
- Department of PathologyBaylor College of MedicineHoustonTX
| | - Amy C. Engevik
- Department of Regenerative Medicine and Cell BiologyMedical University of South CarolinaCharlestonSC
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Ticer T, Stine R, Ellis T, Horvath TD, Haidacher SJ, Hoch KM, Haag AM, Engevik AC, Engevik MA. Klebsiella pneumoniae
Cross‐feeds
Clostridioides difficile
and Enhances Colonic Pro‐inflammatory Responses. FASEB J 2022. [DOI: 10.1096/fasebj.2022.36.s1.r5979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Taylor Ticer
- Department of Microbiology & ImmunologyMedical University of South CarolinaCharlestonSC
- Department of Regenerative Medicine & Cell BiologyMedical University of South CarolinaCharlestonSC
| | - Rachel Stine
- Department of Cell and Development BiologyUniversity of PennsylvaniaPhiladelphiaPA
| | - Terri Ellis
- Department of BiologyUniversity of North FloridaJacksonvilleFL
| | - Thomas D. Horvath
- Department of PathologyTexas Children’s HospitalHoustonTX
- Department of Pathology & ImmunologyBaylor College of MedicineHoustonTX
| | - Sigmund J. Haidacher
- Department of PathologyTexas Children’s HospitalHoustonTX
- Department of Pathology & ImmunologyBaylor College of MedicineHoustonTX
| | - Kathleen M. Hoch
- Department of PathologyTexas Children’s HospitalHoustonTX
- Department of Pathology & ImmunologyBaylor College of MedicineHoustonTX
| | - Anthony M. Haag
- Department of PathologyTexas Children’s HospitalHoustonTX
- Department of Pathology & ImmunologyBaylor College of MedicineHoustonTX
| | - Amy C. Engevik
- Department of Regenerative Medicine & Cell BiologyMedical University of South CarolinaCharlestonSC
| | - Melinda A. Engevik
- Department of Regenerative Medicine & Cell BiologyMedical University of South CarolinaCharlestonSC
- Department of Microbiology & ImmunologyMedical University of South CarolinaCharlestonSC
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7
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Fultz R, Ticer T, Ihekweazu FD, Horvath TD, Haidacher SJ, Hoch KM, Bajaj M, Spinler JK, Haag AM, Buffington SA, Engevik MA. Unraveling the Metabolic Requirements of the Gut Commensal Bacteroides ovatus. Front Microbiol 2021; 12:745469. [PMID: 34899632 PMCID: PMC8656163 DOI: 10.3389/fmicb.2021.745469] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Accepted: 10/29/2021] [Indexed: 01/16/2023] Open
Abstract
Background: Bacteroidetes are the most common bacterial phylum in the mammalian intestine and the effects of several Bacteroides spp. on multiple facets of host physiology have been previously described. Of the Bacteroides spp., Bacteroides ovatus has recently garnered attention due to its beneficial effects in the context of intestinal inflammation. In this study, we aimed to examine model host intestinal physiological conditions and dietary modifications to characterize their effects on B. ovatus growth. Methods and Results: Using Biolog phenotypic microarrays, we evaluated 62 primary carbon sources and determined that B. ovatus ATCC 8384 can use the following carbohydrates as primary carbon sources: 10 disaccharides, 4 trisaccharides, 4 polysaccharides, 4 polymers, 3 L-linked sugars, 6 D-linked sugars, 5 amino-sugars, 6 alcohol sugars, and 15 organic acids. Proteomic profiling of B. ovatus bacteria revealed that a significant portion of the B. ovatus proteome contains proteins important for metabolism. Among the proteins, we found glycosyl hydrolase (GH) familes GH2, GH5, GH20, GH 43, GH88, GH92, and GH95. We also identified multiple proteins with antioxidant properties and reasoned that these proteins may support B. ovatus growth in the GI tract. Upon further testing, we showed that B. ovatus grew robustly in various pH, osmolarity, bile, ethanol, and H2O2 concentrations; indicating that B. ovatus is a well-adapted gut microbe. Conclusion: Taken together, we have demonstrated that key host and diet-derived changes in the intestinal environment influence B. ovatus growth. These data provide the framework for future work toward understanding how diet and lifestyle interventions may promote a beneficial environment for B. ovatus growth.
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Affiliation(s)
- Robert Fultz
- Department of Neuroscience, Cell Biology, and Anatomy, University of Texas Medical Branch, Galveston, TX, United States
| | - Taylor Ticer
- Department of Regenerative Medicine & Cell Biology, Medical University of South Carolina, Charleston, SC, United States
| | - Faith D. Ihekweazu
- Department of Pediatrics, Baylor College of Medicine, Houston, TX, United States
- Section of Gastroenterology, Hepatology, and Nutrition, Texas Children’s Hospital, Houston, TX, United States
| | - Thomas D. Horvath
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, United States
- Department of Pathology, Texas Children’s Hospital, Houston, TX, United States
| | - Sigmund J. Haidacher
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, United States
- Department of Pathology, Texas Children’s Hospital, Houston, TX, United States
| | - Kathleen M. Hoch
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, United States
- Department of Pathology, Texas Children’s Hospital, Houston, TX, United States
| | - Meghna Bajaj
- Department of Chemistry and Physics and Department of Biotechnology, Alcorn State University, Lorman, MS, United States
| | - Jennifer K. Spinler
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, United States
- Department of Pathology, Texas Children’s Hospital, Houston, TX, United States
| | - Anthony M. Haag
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, United States
- Department of Pathology, Texas Children’s Hospital, Houston, TX, United States
| | - Shelly A. Buffington
- Department of Neuroscience, Cell Biology, and Anatomy, University of Texas Medical Branch, Galveston, TX, United States
| | - Melinda A. Engevik
- Department of Regenerative Medicine & Cell Biology, Medical University of South Carolina, Charleston, SC, United States
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8
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Engevik MA, Herrmann B, Ruan W, Engevik AC, Engevik KA, Ihekweazu F, Shi Z, Luck B, Chang-Graham AL, Esparza M, Venable S, Horvath TD, Haidacher SJ, Hoch KM, Haag AM, Schady DA, Hyser JM, Spinler JK, Versalovic J. Bifidobacterium dentium-derived y-glutamylcysteine suppresses ER-mediated goblet cell stress and reduces TNBS-driven colonic inflammation. Gut Microbes 2021; 13:1-21. [PMID: 33985416 PMCID: PMC8128206 DOI: 10.1080/19490976.2021.1902717] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Endoplasmic reticulum (ER) stress compromises the secretion of MUC2 from goblet cells and has been linked with inflammatory bowel disease (IBD). Although Bifidobacterium can beneficially modulate mucin production, little work has been done investigating the effects of Bifidobacterium on goblet cell ER stress. We hypothesized that secreted factors from Bifidobacterium dentium downregulate ER stress genes and modulates the unfolded protein response (UPR) to promote MUC2 secretion. We identified by mass spectrometry that B. dentium secretes the antioxidant γ-glutamylcysteine, which we speculate dampens ER stress-mediated ROS and minimizes ER stress phenotypes. B. dentium cell-free supernatant and γ-glutamylcysteine were taken up by human colonic T84 cells, increased glutathione levels, and reduced ROS generated by the ER-stressors thapsigargin and tunicamycin. Moreover, B. dentium supernatant and γ-glutamylcysteine were able to suppress NF-kB activation and IL-8 secretion. We found that B. dentium supernatant, γ-glutamylcysteine, and the positive control IL-10 attenuated the induction of UPR genes GRP78, CHOP, and sXBP1. To examine ER stress in vivo, we first examined mono-association of B. dentium in germ-free mice which increased MUC2 and IL-10 levels compared to germ-free controls. However, no changes were observed in ER stress-related genes, indicating that B. dentium can promote mucus secretion without inducing ER stress. In a TNBS-mediated ER stress model, we observed increased levels of UPR genes and pro-inflammatory cytokines in TNBS treated mice, which were reduced with addition of live B. dentium or γ-glutamylcysteine. We also observed increased colonic and serum levels of IL-10 in B. dentium- and γ-glutamylcysteine-treated mice compared to vehicle control. Immunostaining revealed retention of goblet cells and mucus secretion in both B. dentium- and γ-glutamylcysteine-treated animals. Collectively, these data demonstrate positive modulation of the UPR and MUC2 production by B. dentium-secreted compounds.
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Affiliation(s)
- Melinda A. Engevik
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, Texas, USA,Department of Pathology, Texas Children’s Hospital, Houston, Texas, USA,CONTACT Melinda A. Engevik Department of Pathology & Immunology, Baylor College of Medicine, Houston, Texas, USA
| | - Beatrice Herrmann
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, Texas, USA,Department of Pathology, Texas Children’s Hospital, Houston, Texas, USA
| | - Wenly Ruan
- Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA,Section of Gastroenterology, Hepatology, and Nutrition, Texas Children’s Hospital, Houston, Texas, USA
| | - Amy C. Engevik
- Department of Surgery, Vanderbilt University Medical Center, NashvilleTN, USA
| | - Kristen A. Engevik
- Department of Molecular Virology & Microbiology, Baylor College of Medicine, Houston, TX, USA
| | - Faith Ihekweazu
- Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA,Section of Gastroenterology, Hepatology, and Nutrition, Texas Children’s Hospital, Houston, Texas, USA
| | - Zhongcheng Shi
- Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA,Section of Gastroenterology, Hepatology, and Nutrition, Texas Children’s Hospital, Houston, Texas, USA
| | - Berkley Luck
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, Texas, USA,Department of Pathology, Texas Children’s Hospital, Houston, Texas, USA
| | | | - Magdalena Esparza
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, Texas, USA,Department of Pathology, Texas Children’s Hospital, Houston, Texas, USA
| | - Susan Venable
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, Texas, USA,Department of Pathology, Texas Children’s Hospital, Houston, Texas, USA
| | - Thomas D. Horvath
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, Texas, USA,Department of Pathology, Texas Children’s Hospital, Houston, Texas, USA
| | - Sigmund J. Haidacher
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, Texas, USA,Department of Pathology, Texas Children’s Hospital, Houston, Texas, USA
| | - Kathleen M. Hoch
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, Texas, USA,Department of Pathology, Texas Children’s Hospital, Houston, Texas, USA
| | - Anthony M. Haag
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, Texas, USA,Department of Pathology, Texas Children’s Hospital, Houston, Texas, USA
| | - Deborah A. Schady
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, Texas, USA,Department of Pathology, Texas Children’s Hospital, Houston, Texas, USA
| | - Joseph M. Hyser
- Department of Molecular Virology & Microbiology, Baylor College of Medicine, Houston, TX, USA,Alkek Center for Metagenomics and Microbiome Research, Baylor College of Medicine, Houston, TX, USA
| | - Jennifer K. Spinler
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, Texas, USA,Department of Pathology, Texas Children’s Hospital, Houston, Texas, USA
| | - James Versalovic
- Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA,Section of Gastroenterology, Hepatology, and Nutrition, Texas Children’s Hospital, Houston, Texas, USA
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9
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Engevik MA, Danhof HA, Hall A, Engevik KA, Horvath TD, Haidacher SJ, Hoch KM, Endres BT, Bajaj M, Garey KW, Britton RA, Spinler JK, Haag AM, Versalovic J. The metabolic profile of Bifidobacterium dentium reflects its status as a human gut commensal. BMC Microbiol 2021; 21:154. [PMID: 34030655 PMCID: PMC8145834 DOI: 10.1186/s12866-021-02166-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Accepted: 03/30/2021] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND Bifidobacteria are commensal microbes of the mammalian gastrointestinal tract. In this study, we aimed to identify the intestinal colonization mechanisms and key metabolic pathways implemented by Bifidobacterium dentium. RESULTS B. dentium displayed acid resistance, with high viability over a pH range from 4 to 7; findings that correlated to the expression of Na+/H+ antiporters within the B. dentium genome. B. dentium was found to adhere to human MUC2+ mucus and harbor mucin-binding proteins. Using microbial phenotyping microarrays and fully-defined media, we demonstrated that in the absence of glucose, B. dentium could metabolize a variety of nutrient sources. Many of these nutrient sources were plant-based, suggesting that B. dentium can consume dietary substances. In contrast to other bifidobacteria, B. dentium was largely unable to grow on compounds found in human mucus; a finding that was supported by its glycosyl hydrolase (GH) profile. Of the proteins identified in B. dentium by proteomic analysis, a large cohort of proteins were associated with diverse metabolic pathways, indicating metabolic plasticity which supports colonization of the dynamic gastrointestinal environment. CONCLUSIONS Taken together, we conclude that B. dentium is well adapted for commensalism in the gastrointestinal tract.
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Affiliation(s)
- Melinda A Engevik
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA.
- Department of Pathology, Texas Children's Hospital, Houston, TX, USA.
- Department of Regernative Medicine & Cell Biology, Medical University of South Carolina, SC, Charleston, USA.
| | - Heather A Danhof
- Department of Virology and Microbiology, Baylor College of Medicine, Houston, TX, USA
| | - Anne Hall
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA
- Department of Pathology, Texas Children's Hospital, Houston, TX, USA
| | - Kristen A Engevik
- Department of Virology and Microbiology, Baylor College of Medicine, Houston, TX, USA
| | - Thomas D Horvath
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA
- Department of Pathology, Texas Children's Hospital, Houston, TX, USA
| | - Sigmund J Haidacher
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA
- Department of Pathology, Texas Children's Hospital, Houston, TX, USA
| | - Kathleen M Hoch
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA
- Department of Pathology, Texas Children's Hospital, Houston, TX, USA
| | - Bradley T Endres
- Department of Pharmacy Practice and Translational Research, University of Houston College of Pharmacy, Houston, TX, USA
| | - Meghna Bajaj
- Department of Chemistry and Physics, and Department of Biotechnology, Alcorn State University, Lorman, MS, 39096, USA
| | - Kevin W Garey
- Department of Pharmacy Practice and Translational Research, University of Houston College of Pharmacy, Houston, TX, USA
| | - Robert A Britton
- Department of Virology and Microbiology, Baylor College of Medicine, Houston, TX, USA
| | - Jennifer K Spinler
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA
- Department of Pathology, Texas Children's Hospital, Houston, TX, USA
| | - Anthony M Haag
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA
- Department of Pathology, Texas Children's Hospital, Houston, TX, USA
| | - James Versalovic
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA
- Department of Pathology, Texas Children's Hospital, Houston, TX, USA
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10
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Thapa S, Venkatachalam A, Khan N, Naqvi M, Balderas M, Runge JK, Haag A, Hoch KM, Glaze DG, Luna RA, Motil KJ. Assessment of the gut bacterial microbiome and metabolome of girls and women with Rett Syndrome. PLoS One 2021; 16:e0251231. [PMID: 33956889 PMCID: PMC8101921 DOI: 10.1371/journal.pone.0251231] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Accepted: 04/22/2021] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Gastrointestinal problems affect the health and quality of life of individuals with Rett syndrome (RTT) and pose a medical hardship for their caregivers. We hypothesized that the variability in the RTT phenotype contributes to the dysbiosis of the gut microbiome and metabolome in RTT, predisposing these individuals to gastrointestinal dysfunction. OBJECTIVES We characterized the gut bacterial microbiome and metabolome in girls and young women with RTT (n = 44) and unaffected controls (n = 21), and examined the relation between the composition of the microbiome and variations in the RTT phenotype. METHODS Demographics and clinical information, including growth and anthropometric measurements, pubertal status, symptoms, clinical severity score, bowel movement, medication use, and dietary intakes were collected from the participants. Fecal samples were collected for analysis of the gut microbiome using Illumina MiSeq-based next-generation sequencing of the 16S rRNA gene followed by bioinformatics analysis of microbial composition, diversity, and community structure. Selected end-products of microbial protein metabolism were characterized by liquid chromatography-mass spectrometry. RESULTS The gut bacterial microbiome differed within the RTT cohort based on pubertal status (p<0.02) and clinical severity scores (p<0.02) of the individuals and the type of diet (p<0.01) consumed. Although the composition of the gut microbiome did not differ between RTT and unaffected individuals, concentrations of protein end-products of the gut bacterial metabolome, including γ-aminobutyric acid (GABA) (p<0.001), tyrosine (p<0.02), and glutamate (p<0.06), were lower in the RTT cohort. Differences in the microbiome within RTT groups, based on symptomatic anxiety, hyperventilation, abdominal distention, or changes in stool frequency and consistency, were not detected. CONCLUSIONS Although variability in the RTT phenotype contributes to the dysbiosis of the gut microbiome, we presently cannot infer causality between gut bacterial dysbiosis and gastrointestinal dysfunction. Nevertheless, alterations in the gut metabolome may provide clues to the pathophysiology of gastrointestinal problems in RTT.
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Affiliation(s)
- Santosh Thapa
- Department of Pathology, Medical Metagenomics Laboratory, Texas Children’s Microbiome Center, Texas Children’s Hospital, Houston, Texas, United States of America
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, Texas, United States of America
| | - Alamelu Venkatachalam
- Department of Pathology, Medical Metagenomics Laboratory, Texas Children’s Microbiome Center, Texas Children’s Hospital, Houston, Texas, United States of America
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, Texas, United States of America
| | - Nabeel Khan
- Department of Pediatrics, Baylor College of Medicine, Houston, Texas, United States of America
| | - Mohammed Naqvi
- Department of Pediatrics, Baylor College of Medicine, Houston, Texas, United States of America
| | - Miriam Balderas
- Department of Pathology, Medical Metagenomics Laboratory, Texas Children’s Microbiome Center, Texas Children’s Hospital, Houston, Texas, United States of America
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, Texas, United States of America
| | - Jessica K. Runge
- Department of Pathology, Medical Metagenomics Laboratory, Texas Children’s Microbiome Center, Texas Children’s Hospital, Houston, Texas, United States of America
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, Texas, United States of America
| | - Anthony Haag
- Department of Pathology, Metabolomics and Proteomics Laboratory, Texas Children’s Microbiome Center, Texas Children’s Hospital, Houston, Texas, United States of America
| | - Kathleen M. Hoch
- Department of Pathology, Metabolomics and Proteomics Laboratory, Texas Children’s Microbiome Center, Texas Children’s Hospital, Houston, Texas, United States of America
| | - Daniel G. Glaze
- Department of Pediatrics, Baylor College of Medicine, Houston, Texas, United States of America
- Department of Neurology, Baylor College of Medicine, Houston, Texas, United States of America
| | - Ruth Ann Luna
- Department of Pathology, Medical Metagenomics Laboratory, Texas Children’s Microbiome Center, Texas Children’s Hospital, Houston, Texas, United States of America
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, Texas, United States of America
| | - Kathleen J. Motil
- Department of Pediatrics, Baylor College of Medicine, Houston, Texas, United States of America
- USDA/ARS Children’s Nutrition Research Center, Baylor College of Medicine, Houston, Texas, United States of America
- * E-mail:
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11
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Horvath TD, Haidacher SJ, Oezguen N, Hoch KM, Auchtung JM, Haag AM. Ruggedness testing of liquid chromatography-tandem mass spectrometry system components using microbiome-relevant methods and matrices. J Microbiol Methods 2020; 177:106020. [PMID: 32795635 DOI: 10.1016/j.mimet.2020.106020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 06/24/2020] [Accepted: 07/22/2020] [Indexed: 10/23/2022]
Abstract
Recently, an opportunity to perform a broad ruggedness assessment of our liquid chromatography-tandem mass spectrometry (LC-MS/MS) system presented itself during the analytical planning phase of a large-scale human fecal microbiome study. The specific aim of this project was to study the microbial-mediated metabolism of a targeted set of bile acids/salts by mixed bacterial communities cultured from the feces of 12 healthy volunteers when grown in a custom growth medium and following exposure to different clinically-relevant antibiotics. The magnitude of this study offered a rare opportunity to significantly stress procedures and LC-MS/MS system components comprised in our bile acid/salt targeted metabolomics method. With this second specific aim in mind, we modified the sample analysis plan to include a series of figure-of-merit (FoM)-based tests that are commonly used in regulated bioanalytical labs to assess LC and MS system ruggedness for a specific assay - these FoM-based testing parameters were monitored continuously over the course of sample analysis and the results are presented in this report. In total, the assessment included 1206 sequential injections (180 calibration standards, 136 blank-internal standard samples, and 890 diluted medium samples) that took place over 8-days. Completion of the 8-days of non-stop sample analysis revealed no critical hardware or software failures, and the analysis of the FoM-based tests indicated no observable degradation of system performance over the number of samples and time tested. The FoM-based test metrics presented may be used as a template to assess the ruggedness of any LC-MS/MS-based targeted metabolomics workflow.
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Affiliation(s)
- Thomas D Horvath
- Department of Pathology and Immunology, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX 77030, United States; Texas Children's Microbiome Center, Department of Pathology, Texas Children's Hospital, 1102 Bates Ave, Houston, TX 77030, United States
| | - Sigmund J Haidacher
- Department of Pathology and Immunology, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX 77030, United States; Texas Children's Microbiome Center, Department of Pathology, Texas Children's Hospital, 1102 Bates Ave, Houston, TX 77030, United States
| | - Numan Oezguen
- Department of Pathology and Immunology, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX 77030, United States; Texas Children's Microbiome Center, Department of Pathology, Texas Children's Hospital, 1102 Bates Ave, Houston, TX 77030, United States
| | - Kathleen M Hoch
- Department of Pathology and Immunology, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX 77030, United States; Texas Children's Microbiome Center, Department of Pathology, Texas Children's Hospital, 1102 Bates Ave, Houston, TX 77030, United States
| | - Jennifer M Auchtung
- Food Science and Technology Department, the University of Nebraska-Lincoln, 1901 N 21(st) Street, Lincoln, NE 68588, United States
| | - Anthony M Haag
- Department of Pathology and Immunology, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX 77030, United States; Texas Children's Microbiome Center, Department of Pathology, Texas Children's Hospital, 1102 Bates Ave, Houston, TX 77030, United States.
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12
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Horvath TD, Haidacher SJ, Hoch KM, Auchtung JM, Haag AM. A high-throughput LC-MS/MS method for the measurement of the bile acid/salt content in microbiome-derived sample sets. MethodsX 2020; 7:100951. [PMID: 32637329 PMCID: PMC7327831 DOI: 10.1016/j.mex.2020.100951] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Accepted: 06/04/2020] [Indexed: 01/15/2023] Open
Abstract
Due to the physicochemical properties of bile acids/salts (i.e., hydrophobic and ionizable), the application of reverse-phase liquid chromatography-tandem mass spectrometry (LC-MS/MS)-based methods are ideally suited for the measurement of these compounds in a host of microbiologically-relevant matrices. Here, we provide a detailed bioanalytical protocol that contains several modifications of a method previously described by Wegner et al. [1]. Briefly, this modified method exhibits the following advantages for the measurement of cholic acid (CA), taurocholic acid (TCA), and deoxycholic acid (DCA) in microbiome-relevant sample matrices: i) fecal sample processing has been streamlined by the elimination of lyophilization and manual homogenization steps; ii) the Sciex 6500 QTRAP hybrid triple-quadrupole/linear ion trap mass spectrometer has sufficient sensitivity to perform the measurement of bile acids/salts in negative ion mode - ammonium adducts of bile acids/salts are not required for detection; and, iii) assay throughput has been boosted by more than 5-fold by shortening the chromatographic duty cycle of a single sample injection from 45 min to 8.4 min. Recently, the method was used to perform 508 sequential injections (72 calibration standards, 52 blank-internal standard sample, and 368 MiniBioReactor Array (MBRA)-derived samples) from four separate batches over a 4-day time period.
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Affiliation(s)
- Thomas D Horvath
- Department of Pathology and Immunology, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX 77030, United States.,Texas Children's Microbiome Center, Texas Children's Hospital, 1102 Bates Ave, Houston, TX 77030, United States
| | - Sigmund J Haidacher
- Department of Pathology and Immunology, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX 77030, United States.,Texas Children's Microbiome Center, Texas Children's Hospital, 1102 Bates Ave, Houston, TX 77030, United States
| | - Kathleen M Hoch
- Department of Pathology and Immunology, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX 77030, United States.,Texas Children's Microbiome Center, Texas Children's Hospital, 1102 Bates Ave, Houston, TX 77030, United States
| | - Jennifer M Auchtung
- Food Science and Technology Department, the University of Nebraska-Lincoln, 1400 R Street, Lincoln, NE 68588, United States
| | - Anthony M Haag
- Department of Pathology and Immunology, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX 77030, United States.,Texas Children's Microbiome Center, Texas Children's Hospital, 1102 Bates Ave, Houston, TX 77030, United States
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13
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Horvath TD, Ak S, Haidacher SJ, Hoch KM, Savidge TC, Haag AM. Sterilization performance comparison between an autosampler-ready microporous filter vial and a syringe-based filter. J Microbiol Methods 2019; 164:105669. [PMID: 31356842 DOI: 10.1016/j.mimet.2019.105669] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Revised: 07/12/2019] [Accepted: 07/14/2019] [Indexed: 12/01/2022]
Abstract
Herein we report that the Thomson Standard and eXtreme/FV® filter vials (0.2 μm polyvinylidene difluoride filter membrane) are as effective as gold standard microporous membrane-based syringe filters at removing bacteria, such as Klebsiella pneumonia, from media samples produced in the microbiological laboratory.
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Affiliation(s)
- Thomas D Horvath
- Department of Pathology and Immunology, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX 77030, United States of America; Texas Children's Microbiome Center, Texas Children's Hospital, 1102 Bates Ave, Houston, TX 77030, United States of America
| | - Sibel Ak
- Department of Pathology and Immunology, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX 77030, United States of America; Texas Children's Microbiome Center, Texas Children's Hospital, 1102 Bates Ave, Houston, TX 77030, United States of America
| | - Sigmund J Haidacher
- Department of Pathology and Immunology, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX 77030, United States of America; Texas Children's Microbiome Center, Texas Children's Hospital, 1102 Bates Ave, Houston, TX 77030, United States of America
| | - Kathleen M Hoch
- Department of Pathology and Immunology, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX 77030, United States of America; Texas Children's Microbiome Center, Texas Children's Hospital, 1102 Bates Ave, Houston, TX 77030, United States of America
| | - Tor C Savidge
- Department of Pathology and Immunology, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX 77030, United States of America; Texas Children's Microbiome Center, Texas Children's Hospital, 1102 Bates Ave, Houston, TX 77030, United States of America
| | - Anthony M Haag
- Department of Pathology and Immunology, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX 77030, United States of America; Texas Children's Microbiome Center, Texas Children's Hospital, 1102 Bates Ave, Houston, TX 77030, United States of America.
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