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Luján JA, Rugeles MT, Taborda NA. Contribution of the Microbiota to Intestinal Homeostasis and its Role in the Pathogenesis of HIV-1 Infection. Curr HIV Res 2020; 17:13-25. [PMID: 30854974 DOI: 10.2174/1570162x17666190311114808] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [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: 01/21/2019] [Revised: 02/25/2019] [Accepted: 03/06/2019] [Indexed: 12/18/2022]
Abstract
During HIV infection, massive destruction of CD4+ T cells ensues, preferentially depleting the Th17 subset at the gut-associated lymphoid tissue (GALT), leading to a loss of mucosal integrity and an increase in cell permeability. This process favors microbial translocation between the intestinal lumen and the circulatory system, contributing to persistent immune activation and chronic inflammation characteristic of HIV infection. Thus, the gut microbiota plays an integral role in maintaining the structure and function of the mucosal barrier, a critical factor for immune homeostasis. However, in the context of HIV infection, changes in the gut microbiota have been reported and have been linked to disease progression. Here, we review evidence for the role of the gut microbiota in intestinal homeostasis, its contribution to HIV pathogenesis, as well as its use in the development of therapeutic strategies.
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Affiliation(s)
- Jorge A Luján
- Grupo Inmunovirologia, Facultad de Medicina. Universidad de Antioquia, Medellin, Colombia
| | - Maria T Rugeles
- Grupo Inmunovirologia, Facultad de Medicina. Universidad de Antioquia, Medellin, Colombia
| | - Natalia A Taborda
- Grupo Inmunovirologia, Facultad de Medicina. Universidad de Antioquia, Medellin, Colombia.,Grupo de Investigaciones Biomédicas, Facultad de Ciencias de la Salud, Corporación Universitaria Remington, Medellín, Colombia
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Shannon B, Gajer P, Yi TJ, Ma B, Humphrys MS, Thomas-Pavanel J, Chieza L, Janakiram P, Saunders M, Tharao W, Huibner S, Shahabi K, Ravel J, Kaul R. Distinct Effects of the Cervicovaginal Microbiota and Herpes Simplex Type 2 Infection on Female Genital Tract Immunology. J Infect Dis 2017; 215:1366-1375. [PMID: 28201724 DOI: 10.1093/infdis/jix088] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [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: 08/31/2016] [Accepted: 02/09/2017] [Indexed: 12/13/2022] Open
Abstract
Background Genital inflammation is a key determinant of human immunodeficiency virus (HIV) transmission, and may increase HIV-susceptible target cells and alter epithelial integrity. Several genital conditions that increase HIV risk are more prevalent in African, Caribbean, and other black (ACB) women, including bacterial vaginosis and herpes simplex virus type-2 (HSV-2) infection. Therefore, we assessed the impact of the genital microbiota on mucosal immunology in ACB women and microbiome-HSV-2 interactions. Methods Cervicovaginal secretions and endocervical cells were collected by cytobrush and Instead Softcup, respectively. T cells and dendritic cells were assessed by flow cytometry, cytokines by multiplex enzyme-linked immunosorbent assay (ELISA), and the microbiota by 16S ribosomal ribonucleic acid gene sequencing. Results The cervicovaginal microbiota of 51 participants were composed of community state types (CSTs) showing diversity (20/51; 39%) or predominated by Lactobacillus iners (22/51; 42%), L. crispatus (7/51; 14%), or L. gasseri (2/51; 4%). High-diversity CSTs and specific bacterial phyla (Gardnerella vaginalis and Prevotella bivia) were strongly associated with cervicovaginal inflammatory cytokines, but not with altered endocervical immune cells. However, cervical CD4+ T-cell number was associated with HSV-2 infection and a distinct cytokine profile. Conclusions This suggests that the genital microbiota and HSV-2 infection may influence HIV susceptibility through independent biological mechanisms.
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Affiliation(s)
- B Shannon
- Department of Medicine, and.,Department of Immunology, University of Toronto, Ontario, Canada
| | - P Gajer
- Institute for Genome Sciences, University of Maryland School of Medicine, and.,Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore
| | - T J Yi
- Department of Medicine, and.,Department of Immunology, University of Toronto, Ontario, Canada
| | - B Ma
- Institute for Genome Sciences, University of Maryland School of Medicine, and.,Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore
| | - M S Humphrys
- Institute for Genome Sciences, University of Maryland School of Medicine, and
| | | | - L Chieza
- Women's Health in Women's Hands Community Health Centre, and
| | - P Janakiram
- Women's Health in Women's Hands Community Health Centre, and
| | - M Saunders
- Women's Health in Women's Hands Community Health Centre, and
| | - W Tharao
- Women's Health in Women's Hands Community Health Centre, and
| | | | | | - J Ravel
- Institute for Genome Sciences, University of Maryland School of Medicine, and.,Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore
| | - R Kaul
- Department of Medicine, and.,Department of Immunology, University of Toronto, Ontario, Canada.,University Health Network (RK), Toronto, Ontario, Canada
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