Inhibition of adaptive immune responses leads to a fatal clinical outcome in SIV-infected pigtailed macaques but not vervet African green monkeys.
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African green monkeys (AGM) and other natural hosts for simian immunodeficiency virus (SIV) do not develop an AIDS-like disease following SIV infection. To evaluate differences in the role of SIV-specific adaptive immune responses between natural and nonnatural hosts, we used SIV(agmVer90) to infect vervet AGM and pigtailed macaques (PTM). This infection results in robust viral replication in both vervet AGM and pigtailed macaques (PTM) but only induces AIDS in the latter species. We delayed the development of adaptive immune responses through combined administration of anti-CD8 and anti-CD20 lymphocyte-depleting antibodies during primary infection of PTM (n = 4) and AGM (n = 4), and compared these animals to historical controls infected with the same virus. Lymphocyte depletion resulted in a 1-log increase in primary viremia and a 4-log increase in post-acute viremia in PTM. Three of the four PTM had to be euthanized within 6 weeks of inoculation due to massive CMV reactivation and disease. In contrast, all four lymphocyte-depleted AGM remained healthy. The lymphocyte-depleted AGM showed only a trend toward a prolongation in peak viremia but the groups were indistinguishable during chronic infection. These data show that adaptive immune responses are critical for controlling disease progression in pathogenic SIV infection in PTM. However, the maintenance of a disease-free course of SIV infection in AGM likely depends on a number of mechanisms including non-adaptive immune mechanisms.
In Situ Hybridization
Reverse Transcriptase Polymerase Chain Reaction
Simian Acquired Immunodeficiency Syndrome
Simian Immunodeficiency Virus
Published Version (Please cite this version)10.1371/journal.ppat.1000691
Publication InfoSchmitz, Jörn E; Zahn, Roland C; Brown, Charles R; Rett, Melisa D; Li, Ming; Tang, Haili; ... Hirsch, Vanessa M (2009). Inhibition of adaptive immune responses leads to a fatal clinical outcome in SIV-infected pigtailed macaques but not vervet African green monkeys. PLoS Pathog, 5(12). pp. e1000691. 10.1371/journal.ppat.1000691. Retrieved from https://hdl.handle.net/10161/4591.
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Professor of Surgery
Dr. Montefiori is Professor and Director of the Laboratory for AIDS Vaccine Research and Development in the Department of Surgery, Division of Surgical Sciences, Duke University Medical Center. His major research interests are viral immunology and AIDS vaccine development, with a special emphasis on neutralizing antibodies. One of his highest priorities is to identify immunogens that generate broadly cross-reactive neutralizing antibodies for inclusion in HIV vaccines. Many aspects of the