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Ghare S, Singhal R, Bryant V, Gautam S, Tirumala CC, Srisailam PK, Reyes-Vega A, Ghooray D, McClain CJ, Hoffman K, Petrosino J, Bryant K, Govind V, Cohen R, Cook RL, Barve S. Age-Associated Gut Dysbiosis, Marked by Loss of Butyrogenic Potential, Correlates With Altered Plasma Tryptophan Metabolites in Older People Living With HIV. J Acquir Immune Defic Syndr 2022; 89:S56-S64. [PMID: 35015746 PMCID: PMC8751293 DOI: 10.1097/qai.0000000000002866] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Accepted: 10/01/2021] [Indexed: 11/25/2022]
Abstract
BACKGROUND Imbalance in tryptophan (TRP) metabolism and its neuroactive metabolites, serotonin and kynurenine (KYN), is a known pathogenic mechanism underlying neurocognitive impairment. Gut microbiota plays an important role in TRP metabolism, and the production of these neuroactive molecules affects neurocognitive function. Although both HIV infection and normal aging independently induce gut dysbiosis and influence TRP metabolism, their interactive effects on compositional/functional changes in gut microbiota and consequent alterations in TRP metabolites remain largely undetermined. METHODS Older people living with HIV infection (PLWH, aged 50-70 years, n = 22) were enrolled in this cross-sectional pilot study. Metagenomic analysis of fecal microbiome using 16S Ribosomal ribonucleic acid gene sequencing and metabolomics analysis of plasma using mass spectrometry with a reverse-phase iquid chromatography tandem mass spectrometry were performed. Statistical analyses included the univariate linear regression and Spearman correlation analyses. RESULTS Age-associated changes in plasma levels of key neuroactive TRP metabolites, serotonin and KYN, were seen in PLWH. Specifically, we observed age-dependent decreases in serotonin and increases in KYN and KYN-to-TRP ratio, indicative of dysfunctional TRP metabolism. Furthermore, the gut dysbiosis seen in older PLWH is characterized by a reduction of Firmicutes/Bacteroidetes ratio and butyrate-producing microbial families Lachnospiraceae and Lactobacillaceae. Of importance, correspondent with gut dysbiosis, increasing age was significantly associated with decreased plasma butyrate levels, which in turn correlated positively with serotonin and negatively with KYN/TRP ratio. CONCLUSIONS Age-dependent gut microbial dysbiosis distinguished by a decrease in butyrogenic potential is a key pathogenic feature associated with the shift in TRP metabolism from serotonin to KYN in older PLWH.
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Affiliation(s)
- Smita Ghare
- Department of Medicine, University of Louisville, KY
- Alcohol Research Center, University of Louisville, KY
| | - Richa Singhal
- Department of Medicine, University of Louisville, KY
- Alcohol Research Center, University of Louisville, KY
| | - Vaughn Bryant
- Department of Epidemiology, Center for Cognitive Aging and Memory, Gainesville, University of Florida, FL
- Department of Clinical and Health Psychology, Center for Cognitive Aging and Memory, Gainesville, University of Florida, FL
| | - Sabina Gautam
- Department of Medicine, University of Louisville, KY
- Alcohol Research Center, University of Louisville, KY
| | - Chanakya Charan Tirumala
- Department of Medicine, University of Louisville, KY
- Alcohol Research Center, University of Louisville, KY
| | - Praneet Kumar Srisailam
- Department of Medicine, University of Louisville, KY
- Alcohol Research Center, University of Louisville, KY
| | - Andrea Reyes-Vega
- Department of Medicine, University of Louisville, KY
- Alcohol Research Center, University of Louisville, KY
| | - Dushan Ghooray
- Department of Medicine, University of Louisville, KY
- Alcohol Research Center, University of Louisville, KY
| | - Craig J. McClain
- Department of Medicine, University of Louisville, KY
- Alcohol Research Center, University of Louisville, KY
- Robley Rex VAMC, Louisville, KY
| | - Kristi Hoffman
- Department of Molecular Virology and Microbiology, Baylor College of Medicine
- Baylor College of Medicine Center for Metagenomics and Microbiome Research
| | - Joseph Petrosino
- Department of Molecular Virology and Microbiology, Baylor College of Medicine
- Baylor College of Medicine Center for Metagenomics and Microbiome Research
| | - Kendall Bryant
- National Institute on Alcohol Abuse and Alcoholism, Bethesda, MD; and
| | - Varan Govind
- Department of Radiology, University of Miami, FL
| | - Ronald Cohen
- Department of Epidemiology, Center for Cognitive Aging and Memory, Gainesville, University of Florida, FL
| | - Robert L. Cook
- Department of Clinical and Health Psychology, Center for Cognitive Aging and Memory, Gainesville, University of Florida, FL
| | - Shirish Barve
- Department of Medicine, University of Louisville, KY
- Alcohol Research Center, University of Louisville, KY
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Burke KA, Dawes RP, Cheema MK, Van Hove A, Benoit DSW, Perry SW, Brown E. Second-harmonic generation scattering directionality predicts tumor cell motility in collagen gels. J Biomed Opt 2015; 20:051024. [PMID: 25625899 PMCID: PMC4306817 DOI: 10.1117/1.jbo.20.5.051024] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Accepted: 12/09/2014] [Indexed: 05/24/2023]
Abstract
Second-harmonic generation (SHG) allows for the analysis of tumor collagen structural changes throughout metastatic progression. SHG directionality, measured through the ratio of the forward-propagating to backward-propagating signal (F/B ratio), is affected by collagen fibril diameter, spacing, and disorder of fibril packing within a fiber. As tumors progress, these parameters evolve, producing concurrent changes in F/B. It has been recently shown that the F/B of highly metastatic invasive ductal carcinoma (IDC) breast tumors is significantly different from less metastatic tumors. This suggests a possible relationship between the microstructure of collagen, as measured by the F/B, and the ability of tumor cells to locomote through that collagen. Utilizing in vitro collagen gels of different F/B ratios, we explored the relationship between collagen microstructure and motility of tumor cells in a “clean” environment, free of the myriad cells, and signals found in in vivo. We found a significant relationship between F/B and the total distance traveled by the tumor cell, as well as both the average and maximum velocities of the cells. Consequently, one possible mechanism underlying the observed relationship between tumor F/B and metastatic output in IDC patient samples is a direct influence of collagen structure on tumor cell motility.
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MESH Headings
- Animals
- Breast Neoplasms/metabolism
- Breast Neoplasms/pathology
- Carcinoma, Ductal, Breast/metabolism
- Carcinoma, Ductal, Breast/pathology
- Cell Line, Tumor
- Cell Movement
- Collagen/chemistry
- Disease Progression
- Female
- Gels/chemistry
- Image Processing, Computer-Assisted
- Mice
- Mice, Inbred BALB C
- Microscopy, Fluorescence, Multiphoton/instrumentation
- Microscopy, Fluorescence, Multiphoton/methods
- Neoplasm Metastasis
- Signal Transduction
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Affiliation(s)
- Kathleen A. Burke
- University of Rochester, Department of Biomedical Engineering, 207 Robert B. Goergen Hall, P.O. Box 270168, Rochester, New York 14627, United States
| | - Ryan P. Dawes
- University of Rochester, Department of Neurobiology and Anatomy, 601 Elmwood Avenue, Rochester, New York 14642, United States
| | - Mehar K. Cheema
- State University of New York at Stony Brook, Department of Biomedical Engineering, Stony Brook, New York 11790, United States
| | - Amy Van Hove
- University of Rochester, Department of Biomedical Engineering, 207 Robert B. Goergen Hall, P.O. Box 270168, Rochester, New York 14627, United States
| | - Danielle S. W. Benoit
- University of Rochester, Department of Biomedical Engineering, 207 Robert B. Goergen Hall, P.O. Box 270168, Rochester, New York 14627, United States
- University of Rochester, Department of Biomedical Genetics, 601 Elmwood Avenue, Rochester, New York 14642, United States
- University of Rochester, Department of Chemical Engineering, 206 Gavett Hall, Rochester, New York 14627, United States
- University of Rochester Medical Center, Center for Musculoskeletal Research, 601 Elmwood Avenue, Rochester, New York 14642, United States
| | - Seth W. Perry
- University of Rochester, Department of Biomedical Engineering, 207 Robert B. Goergen Hall, P.O. Box 270168, Rochester, New York 14627, United States
| | - Edward Brown
- University of Rochester, Department of Biomedical Engineering, 207 Robert B. Goergen Hall, P.O. Box 270168, Rochester, New York 14627, United States
- University of Rochester, Department of Neurobiology and Anatomy, 601 Elmwood Avenue, Rochester, New York 14642, United States
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Wos-Oxley ML, Bleich A, Oxley AP, Kahl S, Janus LM, Smoczek A, Nahrstedt H, Pils MC, Taudien S, Platzer M, Hedrich HJ, Medina E, Pieper DH. Comparative evaluation of establishing a human gut microbial community within rodent models. Gut Microbes 2012; 3:234-49. [PMID: 22572831 PMCID: PMC3427216 DOI: 10.4161/gmic.19934] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
The structure of the human gut microbial community is determined by host genetics and environmental factors, where alterations in its structure have been associated with the onset of different diseases. Establishing a defined human gut microbial community within inbred rodent models provides a means to study microbial-related pathologies, however, an in-depth comparison of the established human gut microbiota in the different models is lacking. We compared the efficiency of establishing the bacterial component of a defined human microbial community within germ-free (GF) rats, GF mice, and antibiotic-treated specific pathogen-free mice. Remarkable differences were observed between the different rodent models. While the majority of abundant human-donor bacterial phylotypes were established in the GF rats, only a subset was present in the GF mice. Despite the fact that members of the phylum Bacteriodetes were well established in all rodent models, mice enriched for phylotypes related to species of Bacteroides. In contrary to the efficiency of Clostridiales to populate the GF rat in relative proportions to that of the human-donor, members of Clostridia cluster IV only poorly colonize the mouse gut. Thus, the genetic background of the different recipient rodent systems (that is, rats and mice) strongly influences the nature of the populating human gut microbiota, determining each model's biological suitability.
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Affiliation(s)
- Melissa L. Wos-Oxley
- Microbial Interactions and Processes Research Group; Department of Medical Microbiology; Helmholtz Centre for Infection Research; Braunschweig, Germany,Correspondence to: Melissa L. Wos-Oxley,
| | - André Bleich
- Institute for Laboratory Animal Science and Central Animal Facility; Hannover Medical School; Hannover, Germany
| | - Andrew P.A. Oxley
- Infection Immunology Research Group; Department of Medical Microbiology; Helmholtz Centre for Infection Research; Braunschweig, Germany
| | - Silke Kahl
- Microbial Interactions and Processes Research Group; Department of Medical Microbiology; Helmholtz Centre for Infection Research; Braunschweig, Germany
| | - Lydia M. Janus
- Institute for Laboratory Animal Science and Central Animal Facility; Hannover Medical School; Hannover, Germany
| | - Anna Smoczek
- Institute for Laboratory Animal Science and Central Animal Facility; Hannover Medical School; Hannover, Germany
| | - Hannes Nahrstedt
- Microbial Interactions and Processes Research Group; Department of Medical Microbiology; Helmholtz Centre for Infection Research; Braunschweig, Germany
| | - Marina C. Pils
- Central Animal Facility; Helmholtz Centre for Infection Research; Braunschweig, Germany
| | - Stefan Taudien
- Genome Analysis; Leibniz Institute for Age Research; Fritz Lipmann Institute; Jena, Germany
| | - Matthias Platzer
- Genome Analysis; Leibniz Institute for Age Research; Fritz Lipmann Institute; Jena, Germany
| | - Hans-Jürgen Hedrich
- Institute for Laboratory Animal Science and Central Animal Facility; Hannover Medical School; Hannover, Germany
| | - Eva Medina
- Infection Immunology Research Group; Department of Medical Microbiology; Helmholtz Centre for Infection Research; Braunschweig, Germany
| | - Dietmar H. Pieper
- Microbial Interactions and Processes Research Group; Department of Medical Microbiology; Helmholtz Centre for Infection Research; Braunschweig, Germany
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