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Buford TW, Sun Y, Roberts LM, Banerjee A, Peramsetty S, Knighton A, Verma A, Morgan D, Torres GE, Li Q, Carter CS. Angiotensin (1-7) delivered orally via probiotic, but not subcutaneously, benefits the gut-brain axis in older rats. GeroScience 2020; 42:1307-1321. [PMID: 32451847 PMCID: PMC7525634 DOI: 10.1007/s11357-020-00196-y] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [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: 02/17/2020] [Accepted: 04/27/2020] [Indexed: 12/21/2022] Open
Abstract
To (1) investigate the efficacy of multiple doses of an orally delivered probiotic bacteria Lactobacillus paracasei (LP) modified to express angiotensin (1-7) (LP-A) in altering physiologic parameters relevant to the gut-brain axis in older rats and to (2) compare this strategy with subcutaneous delivery of synthetic Ang(1-7) peptide on circulating Ang(1-7) concentrations and these gut-brain axis parameters. Male 24-month-old F344BN rats received oral gavage of LP-A, or subcutaneous injection of Ang(1-7) for 0×, 1×, 3×, or 7×/week over 4 weeks. Circulating RAS analytes, inflammatory cytokines, and tryptophan and its downstream metabolites were measured by ELISA, electrochemiluminescence, and LC-MS respectively. Microbiome taxonomic analysis of fecal samples was performed via 16S-based PCR. Inflammatory and tryptophan-related mRNA expression was measured in colon and pre-frontal cortex. All dosing regimens of LP-A induced beneficial changes in fecal microbiome including overall microbiota community structure and α-diversity, while the 3×/week also significantly increased expression of the anti-inflammatory species Akkermansia muciniphila. The 3×/week also increased serum serotonin and the neuroprotective analyte 2-picolinic acid. In the colon, LP-A increased quinolinate phosphoribosyltransferase expression (1×/week) and increased kynurenine aminotransferase II (1× and 3×/week) mRNA expression. LP-A also significantly reduced neuro-inflammatory gene expression in the pre-frontal cortex (3×/week: COX2, IL-1β, and TNFα; 7×/week: COX2 and IL-1β). Subcutaneous delivery of Ang(1-7) increased circulating Ang(1-7) and reduced angiotensin II, but most gut-brain parameters were unchanged in response. Oral-but not subcutaneous-Ang(1-7) altered physiologic parameters related to gut-brain axis, with the most effects observed in 3×/week oral dosing regimen in older rats.
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Affiliation(s)
- Thomas W. Buford
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL USA ,Integrative Center for Aging Research, University of Alabama at Birmingham, Birmingham, AL USA
| | - Yi Sun
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL USA ,Integrative Center for Aging Research, University of Alabama at Birmingham, Birmingham, AL USA
| | - Lisa M. Roberts
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL USA ,Integrative Center for Aging Research, University of Alabama at Birmingham, Birmingham, AL USA
| | - Anisha Banerjee
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL USA ,Integrative Center for Aging Research, University of Alabama at Birmingham, Birmingham, AL USA
| | - Sujitha Peramsetty
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL USA ,Integrative Center for Aging Research, University of Alabama at Birmingham, Birmingham, AL USA
| | - Anthony Knighton
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL USA ,Integrative Center for Aging Research, University of Alabama at Birmingham, Birmingham, AL USA
| | - Amrisha Verma
- Department of Ophthalmology, University of Florida, Gainesville, FL USA
| | - Drake Morgan
- Department of Psychiatry, University of Florida, Gainesville, FL USA
| | - Gonzalo E. Torres
- Department of Molecular, Cellular, and Biomedical Sciences, City College of New York, New York, NY USA
| | - Qiuhong Li
- Department of Ophthalmology, University of Florida, Gainesville, FL USA
| | - Christy S. Carter
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL USA ,Integrative Center for Aging Research, University of Alabama at Birmingham, Birmingham, AL USA
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