Early Resolution of Acute Immune Activation and Induction of PD-1 in SIV-infected Sooty Mangabeys Distinguishes Nonpathogenic from Pathogenic Infection in Rhesus Macaques

Overview

Journal J Immunol

Specialty Allergy & Immunology

Date 2008 May 6

PMID 18453600

Citations 104

Authors

Jacob D Estes

Shari N Gordon

Ming Zeng

Ann M Chahroudi

Richard M Dunham

Silvija I Staprans

Cavan S Reilly

Guido Silvestri

Ashley T Haase

Affiliations

Soon will be listed here.

Abstract

Primate lentiviruses are typically apathogenic in their evolutionarily coadapted host species but can be lethal when transferred to new host species. Why such infections are pathogenic in humans and rhesus macaques (RMs) but not in sooty mangabeys (SMs), a natural host, remains unclear. Studies of chronically infected animals point to the importance of diminished immune activation in response to the infection in SMs. In this study, we sought the causes and timing of the differences in immune activation in a comparative study of acute SIV infection in RMs and SMs. Surprisingly, we show that in acute infection immune activation is comparable in SMs and RMs but thereafter, SMs quickly resolve immune activation, whereas RMs did not. Early resolution of immune activation in SMs correlated with increased expression of PD-1 and with preservation of CD4(+) T cell counts and lymphatic tissue architecture. These findings point to early control of immune activation by host immunoregulatory mechanisms as a major determinant of the different disease outcomes in SIV infection of natural vs non-natural hosts.

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