A Simian Immunodeficiency Virus-Infected Macaque Model of Enterocytozoon bieneusi Infection
- 25 January 2023
- journal article
- research article
- Published by Mary Ann Liebert Inc in AIDS Research and Human Retroviruses
- Vol. 39 (2), 76-83
- https://doi.org/10.1089/aid.2022.0091
Abstract
Microsporidiosis caused by Enterocytozoon bieneusi is a common opportunistic infection in patients with HIV/AIDS and those on immunosuppressive therapy. A significant loss of mucosal or peripheral CD4+ T cells and subsequent dysfunction of the intestinal immune system may be responsible for the development of chronic microsporidiosis in these patients. We have used the Simian immunodeficiency virus (SIV)-infected macaque model to investigate this relationship. To establish the course of E. bieneusi infection in SIV-infected animals, four SIV-infected animals were experimentally challenged with E. bieneusi when their CD4+ counts dropped to less than 300 cells/μL of blood. Analysis of fecal samples by nested polymerase chain reaction revealed that three out of four E. bieneusi-infected macaques continued to shed spores for 7–24 months after infection, an indication of chronic microsporidiosis. Four other SIV-infected macaques, after having an initial negative phase, spontaneously acquired E. bieneusi infection when their CD4+ counts dropped to less than 600 cells/μL of blood and shed spores for 8–19 months. The shedding of E. bieneusi spores in the feces increased relative to decrease in peripheral blood CD4+ T cell numbers. Gut biopsies were obtained before and after challenge to phenotype the mucosal lymphocyte subsets using flow cytometry. The immunophenotypic analysis showed no restoration of CD4+ T cells after E. bieneusi infection in the intestinal cells. A slight increase in the percentage population of CD4+ T cells in peripheral blood did not have any effect on the control of E. bieneusi infection in the SIV-infected macaques. These preliminary studies demonstrate that SIV-infected macaques develop chronic E. bieneusi infections as their CD4+ counts dropped to below 300 cells/μL of blood.Keywords
This publication has 37 references indexed in Scilit:
- Macaques as model hosts for studies of HIV-1 infectionFrontiers in Microbiology, 2013
- Microsporidiosis: Enterocytozoon bieneusi in domesticated and wild animalsResearch in Veterinary Science, 2011
- Serial Propagation of the Microsporidian Enterocytozoon bieneusi of Human Origin in Immunocompromised RodentsInfection and Immunity, 2006
- Production and Characterization of Monoclonal Antibodies against Enterocytozoon bieneusi Purified from Rhesus MacaquesInfection and Immunity, 2005
- Prevalence of Enterocytozoon bieneusi in Swine: an 18-Month Survey at a Slaughterhouse in MassachusettsApplied and Environmental Microbiology, 2002
- Molecular Diagnosis of an Enterocytozoon bieneusi Human Genotype C Infection in a Moderately Immunosuppressed Human Immunodeficiency Virus- Seronegative Liver-Transplant Recipient with Severe Chronic Diarrhea Journal of Clinical Microbiology, 2001
- Characterization of Gut-Associated Lymphoid Tissue (GALT) of Normal Rhesus MacaquesClinical Immunology and Immunopathology, 1997
- Prevalence of Microsporidiosis Due to Enterocytozoon bieneusi and Encephalitozoon (Septata) intestinalis Among Patients with AIDS-Related Diarrhea: Determination by Polymerase Chain Reaction to the Microsporidian Small-Subunit rRNA GeneClinical Infectious Diseases, 1996
- Enterocytozoon bieneusi as a Cause of Chronic Diarrhea in a Heart-Lung Transplant Recipient Who Was Seronegative for Human Immunodeficiency VirusClinical Infectious Diseases, 1996
- Malabsorption and wasting in AIDS patients with microsporidia and pathogen-negative diarrheaAIDS, 1996