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Xu L, Yang Y, Li Y, Lu Y, Gao C, Bian X, Liu Z, Sun Q. Characterizing the Pathogenicity and Immunogenicity of Simian Retrovirus Subtype 8 (SRV-8) Using SRV-8-Infected Cynomolgus Monkeys. Viruses 2023; 15:1538. [PMID: 37515223 PMCID: PMC10384433 DOI: 10.3390/v15071538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 07/10/2023] [Accepted: 07/10/2023] [Indexed: 07/30/2023] Open
Abstract
Simian retrovirus subtype 8 (SRV-8) infections have been reported in cynomolgus monkeys (Macaca fascicularis) in China and America, but its pathogenicity and immunogenicity are rarely reported. In this work, the SRV-8-infected monkeys were identified from the monkeys with anemia, weight loss, and diarrhea. To clarify the impact of SRV-8 infection on cynomolgus monkeys, infected monkeys were divided into five groups according to disease progression. Hematoxylin (HE) staining and viral loads analysis showed that SRV-8 mainly persisted in the intestine and spleen, causing tissue damage. Additionally, the dynamic variations of blood routine indexes, innate and adaptive immunity, and the transcriptomic changes in peripheral blood cells were analyzed during SRV-8 infection. Compared to uninfected animals, red blood cells, hemoglobin, and white blood cells were reduced in SRV-8-infected monkeys. The percentage of immune cell populations was changed after SRV-8 infection. Furthermore, the number of hematopoietic stem cells decreased significantly during the early stages of SRV-8 infection, and returned to normal levels after antibody-mediated viral clearance. Finally, global transcriptomic analysis in PBMCs from SRV-8-infected monkeys revealed distinct gene expression profiles across different disease stages. In summary, SRV-8 infection can cause severe pathogenicity and immune disturbance in cynomolgus monkeys, and it might be responsible for fatal virus-associated immunosuppressive syndrome.
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Affiliation(s)
- Libing Xu
- Institute of Comparative Medicine, College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou 225009, China
- Institute of Neuroscience, Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences, Shanghai 200031, China
| | - Yunpeng Yang
- Institute of Comparative Medicine, College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou 225009, China
| | - Yandong Li
- Institute of Neuroscience, Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences, Shanghai 200031, China
| | - Yong Lu
- Institute of Neuroscience, Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences, Shanghai 200031, China
| | - Changshan Gao
- Institute of Neuroscience, Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences, Shanghai 200031, China
| | - Xinyan Bian
- Institute of Neuroscience, Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences, Shanghai 200031, China
| | - Zongping Liu
- Institute of Comparative Medicine, College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou 225009, China
| | - Qiang Sun
- Institute of Comparative Medicine, College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou 225009, China
- Institute of Neuroscience, Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences, Shanghai 200031, China
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Annisaa FLN, Saepuloh U, Iskandriati D, Pamungkas J. Identification and molecular characterization of simian endogenous retrovirus in Macaca fascicularis and Macaca nemestrina from captive breeding facilities in Bogor, Indonesia. Vet World 2022; 15:1827-1834. [PMID: 36185511 PMCID: PMC9394155 DOI: 10.14202/vetworld.2022.1827-1834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2022] [Accepted: 06/14/2022] [Indexed: 11/16/2022] Open
Abstract
Background and Aim Endogenous retroviruses (ERVs) found in all vertebrates, including non-human primates (NHPs), are known to be genetically inherited. Thus, recent studies have explored ERVs for human immunodeficiency virus vaccine development using human ERV (HERV) due to the hypervariability of exogenous retroviruses which cause conventional vaccines to be ineffective. HERV was also found to be able to induce an immune response in cancer patients. This study aimed to identify and molecularly characterize ERVs from Indonesian NHPs: Macaca fascicularis and Macaca nemestrina. Then, we described the phylogenetic relationship of these isolates with those of the simian ERVs (SERVs) characterized in other species and countries. Materials and Methods First, 5 mL of whole blood samples was taken from 131 long-tailed macaques and 58 pig-tailed macaques in captive breeding facilities at Bogor, Indonesia, for DNA extraction. Next, the DNA samples were screened using the SYBR Green real-time polymerase chain reaction (PCR) technique with specific primers for env (simian retroviruses [SRV]1-5 7585U19 and SRV1-5 7695L21). Positive SERV results were those with cycle threshold (CT) values < 24 (CT < 24) and melting temperature (TM) ranges of 80°C-82°C. Then, whole-genome nucleotide sequences from two pig-tailed macaques samples detected as positive SERV were generated using a nucleic acid sequencing technique which utilized the walking primer method. Subsequently, the sequences were analyzed using bioinformatics programs, such as 4Peaks, Clustal Omega, and BLAST (NCBI). Subsequently, a phylogenetic tree was constructed using the neighbor-joining method in MEGA X. Results SYBR Green real-time PCR amplification results indicated that SERV (Mn B1 and Mn B140910)-positive samples had CT values of 22.37-22.54 and TM of 82°C. Moreover, whole-genome sequences resulted in 7991 nucleotide sequences, comprising long terminal repeat, gag, pro, pol, and env genes identical between the sequenced samples. Furthermore, the phylogenetic tree results indicated that both samples from M. nemestrina had 99%-100% nucleotide identities to the Mn 92227 sample identified at the National Primate Center University of Washington (NaPRC UW) which was imported from Indonesia in 1998, confirmed as a novel SERV strain. The phylogenetic tree results also indicated that although SERV whole-genome nucleotide and env amino acid sequences were clustered with SRV-2 (identity values of 82% and 79%, respectively), they had a 99%-100% nucleotide identity to Mn 92227. Meanwhile, the gag, pro, and pol amino acids were clustered with SRV-1, SRV-3, SRV-4, SRV-5, SRV-8, and SERV/1997, with 82% and 88% identity values. Conclusion Based on the SYBR Green real-time PCR profiles generated, similarities with Mn 92227 were observed. Subsequent phylogenetic analysis confirmed that both samples (Mn B1 and Mn B140919) from pig-tailed macaques in the country of origin were novel SERV strains at NaPRC UW. Therefore, it could be used in biomedical research on ERVs.
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Affiliation(s)
| | - Uus Saepuloh
- Primate Research Center, IPB University, Bogor 16128, Indonesia
| | | | - Joko Pamungkas
- Primate Research Center, IPB University, Bogor 16128, Indonesia
- Department of Animal Infectious Diseases and Veterinary Public Health, Faculty of Veterinary Medicine, IPB University, Bogor 16680, Indonesia
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Takano JI, Leon A, Kato M, Abe Y, Fujimoto K. Isolation and DNA characterization of a simian retrovirus 5 from a Japanese monkey (Macaca fuscata). J Gen Virol 2013; 94:955-959. [PMID: 23324469 DOI: 10.1099/vir.0.047621-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
An SRV-like virus was isolated from a colony-born Japanese monkey. To identify this SRV-like virus, we designed universal primers at regions that were conserved among the reported SRV sequences in the 5'-LTR and the short ORF and we obtained plasmid clones containing the complete gag, prt, pol and env genes. The full-length sequences of the isolate were determined from the plasmids and by direct sequencing. Sequence comparisons and phylogenetic analyses indicated that this SRV-like virus had a sequence identical to the reported 626 bp of SRV-5. In this study, we isolated SRV5/JPN/2005/V1 from a Japanese monkey and characterized the full-length SRV-5 sequence.
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Affiliation(s)
- Jun-Ichiro Takano
- The Corporation for Production and Research of Laboratory Primates, 1-16-2 Sakura, Tsukuba, Ibaraki 305-0003, Japan.,Tsukuba Primate Research Center, National Institute of Biomedical Innovation, 1-1 Hachimandai, Tsukuba, Ibaraki 305-0843, Japan
| | - Arlene Leon
- BioReliance Corporation, 9630 Medical Center Drive, Rockville, MD 20850, USA
| | - Miyoko Kato
- The Corporation for Production and Research of Laboratory Primates, 1-16-2 Sakura, Tsukuba, Ibaraki 305-0003, Japan
| | - Yuko Abe
- Amami Wild Animal Research Center Inc., Tatsugo, Amami, Kagoshima 894-0105, Japan
| | - Koji Fujimoto
- The Corporation for Production and Research of Laboratory Primates, 1-16-2 Sakura, Tsukuba, Ibaraki 305-0003, Japan
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Philipp-Staheli J, Marquardt T, Thouless ME, Bruce AG, Grant RF, Tsai CC, Rose TM. Genetic variability of the envelope gene of Type D simian retrovirus-2 (SRV-2) subtypes associated with SAIDS-related retroperitoneal fibromatosis in different macaque species. Virol J 2006; 3:11. [PMID: 16515713 PMCID: PMC1450265 DOI: 10.1186/1743-422x-3-11] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2005] [Accepted: 03/06/2006] [Indexed: 11/21/2022] Open
Abstract
Background D-type simian retrovirus-2 (SRV-2) causes an AIDS-like immune deficiency syndrome (SAIDS) in various macaque species. SAIDS is often accompanied by retroperitoneal fibromatosis (RF), an aggressive fibroproliferative disorder reminiscent of Kaposi's sarcoma in patients with HIV-induced AIDS. In order to determine the association of SRV-2 subtypes with SAIDS-RF, and study the evolution and transmission of SRV-2 in captive macaque populations, we have molecularly characterized the env gene of a number of SRV-2 isolates from different macaque species with and without RF. Results We sequenced the env gene from eighteen SRV-2 isolates and performed sequence comparisons and phylogenetic analyses. Our studies revealed the presence of six distinct subtypes of SRV-2, three of which were associated with SAIDS-RF cases. We found no association between SRV-2 subtypes and a particular macaque species. Little sequence variation was detected in SRV-2 isolates from the same individual, even after many years of infection, or from macaques housed together or related by descent from a common infected parent. Seventy-two amino acid changes were identified, most occurring in the larger gp70 surface protein subunit. In contrast to the lentiviruses, none of the amino acid variations involved potential N-linked glycosylation sites. Structural analysis of a domain within the gp22/gp20 transmembrane subunit that was 100% conserved between SRV-2 subtypes, revealed strong similarities to a disulfide-bonded loop that is crucial for virus-cell fusion and is found in retroviruses and filoviruses. Conclusion Our study suggests that separate introductions of at least six parental SRV-2 subtypes into the captive macaque populations in the U.S. have occurred with subsequent horizontal transfer between macaque species and primate centers. No specific association of a single SRV-2 subtype with SAIDS-RF was seen. The minimal genetic variability of the env gene within a subtype over time suggests that a strong degree of adaptation to its primate host has occurred during evolution of the virus.
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Affiliation(s)
- Jeannette Philipp-Staheli
- Department of Pathobiology, School of Public Health and Community Medicine, University of Washington, Seattle, Washington, USA
| | - Taya Marquardt
- Department of Pathobiology, School of Public Health and Community Medicine, University of Washington, Seattle, Washington, USA
| | - Margaret E Thouless
- Department of Pathobiology, School of Public Health and Community Medicine, University of Washington, Seattle, Washington, USA
| | | | - Richard F Grant
- Washington National Primate Research Center, University of Washington, Seattle, Washington, USA
| | - Che-Chung Tsai
- Washington National Primate Research Center, University of Washington, Seattle, Washington, USA
| | - Timothy M Rose
- Department of Pathobiology, School of Public Health and Community Medicine, University of Washington, Seattle, Washington, USA
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Bielefeldt-Ohmann H, Barouch DH, Bakke AM, Bruce AG, Durning M, Grant R, Letvin NL, Ryan JT, Schmidt A, Thouless ME, Rose TM. Intestinal stromal tumors in a simian immunodeficiency virus-infected, simian retrovirus-2 negative rhesus macaque (Macaca mulatta). Vet Pathol 2005; 42:391-6. [PMID: 15872392 DOI: 10.1354/vp.42-3-391] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Multifocal submucosal stromal tumors were diagnosed in a 5.5-year-old rhesus macaque (Macaca mulatta) experimentally infected with simian immunodeficiency virus, strain SIVsmE660, and CD4+ T cell depleted. The animal was negative for simian retroviruses, SRV-1, -2, and -5. Polymerase chain reaction analysis of DNA from tumor and spleen tissue revealed abundant, preferential presence of retroperitoneal fibromatosis herpesvirus, the macaque homologue of the Kaposi sarcoma-associated herpesvirus (human herpesvirus-8), in the tumors. This was corroborated by demonstration of viral latent nuclear antigen-1 in the nuclei of a majority of the spindeloid tumor cells. Low levels of an additional macaque herpesvirus, rhesus rhadinovirus, were also detected in the spleen and tumor tissues. The spindeloid cells labeled positively for vimentin and CD117 but were negative for CD31, CD68, desmin, and smooth muscle cell actin. Collectively, these findings suggest a relation to but not absolute identity with simian mesenchymoproliferative disorders (MPD) or typical gastrointestinal stromal tumors (GISTs).
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Affiliation(s)
- H Bielefeldt-Ohmann
- Washington National Primate Research Center, University of Washington, Box 357331, Seattle, WA 98195, USA.
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6
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Sommerfelt MA, Harkestad N, Hunter E. The endogenous langur type D retrovirus PO-1-Lu and its exogenous counterparts in macaque and langur monkeys. Virology 2003; 315:275-82. [PMID: 14585330 DOI: 10.1016/s0042-6822(03)00548-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
PO-1-Lu, the endogenous type D retrovirus of langurs (Trachypithecus obscurus) has previously been considered a progenitor to the prototype type D retrovirus, Mason Pfizer monkey virus (M-PMV/SRV-3), that became established in macaque monkeys (Macaca spp.) following a zoonosis. This study reevaluates this hypothesis to include other exogenous SRVs. New sequence information from the gp70(SU)-encoding region of PO-1-Lu shows striking similarity to the newly identified exogenous langur retrovirus, SRV-6, recently isolated from the Hanuman Langur (Semnopithecus entellus). An unrooted, bootstrapped neighbor-joining tree derived from env gene nucleotide sequences shows PO-1-Lu and SRV-6 appear more closely related genetically to SRV-2 than SRV-1 or SRV-3 (M-PMV). This is also reflected in our observations that the M-PMV envelope glycoprotein precursor gPr86(Env) and gp70(SU) were antigenically distinct from PO-1-Lu, although the gp22(TM) glycoproteins were antigenically cross-reactive. The potential that SRV-6 represents an exogenous form of PO-1-Lu that has arisen following a recent zoonosis is discussed.
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Affiliation(s)
- Maja A Sommerfelt
- Centre for Research in Virology, Department of Microbiology and Immunology, The Gade Institute, University of Bergen, Bergen High Technology Centre, N-5020 Bergen, Norway.
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7
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Wilkinson RC, Murrell CK, Guy R, Davis G, Hall JM, North DC, Rose NJ, Almond N. Persistence and dissemination of simian retrovirus type 2 DNA in relation to viremia, seroresponse, and experimental transmissibility in Macaca fascicularis. J Virol 2003; 77:10751-9. [PMID: 14512525 PMCID: PMC224967 DOI: 10.1128/jvi.77.20.10751-10759.2003] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Endemic simian retrovirus (SRV) infection can cause fatal simian AIDS in Macaca fascicularis, but many individuals survive with few clinical signs. To further clarify the parameters of SRV pathogenesis, we investigated the persistence of viral DNA forms in relation to active viremia, antibody response, and transmissibility of infection. In M. fascicularis from endemically SRV-2-infected colonies, viral DNA was present in both linear and unintegrated long terminal repeat circular forms in peripheral blood mononuclear cells of all viremic and many nonviremic animals. Long-term followup of three individuals with distinct infection patterns demonstrated persistence of linear and circular forms of viral DNA in peripheral blood mononuclear cells and tissues, irrespective of viremia or antibody status, but reactivation of latent infections was not observed. The role of viral DNA in transmission and early pathogenesis of SRV-2 was investigated by inoculation of SRV-2 DNA-positive blood into groups of naïve M. fascicularis from either a viremic or nonviremic donor and subsequent analysis of the virological and serological status of the recipients. Transmission of SRV and development of anti-SRV antibodies were only observed in recipients of blood from the viremic donor; transfer of SRV provirus and unintegrated circular DNA in blood from the nonviremic donor did not lead to infection of the recipients. These results indicate that a proportion of M. fascicularis are able to effectively control the replication and infectivity of SRV despite long-term persistence of viral DNA forms in infected lymphocytes.
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Affiliation(s)
- Roseanne C Wilkinson
- Division of Retrovirology. Division of Virology, National Institute for Biological Standards and Control, Potters Bar, Hertfordshire EN6 3QG, United Kingdom.
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8
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Nandi JS, Tikute SA, Chhangani AK, Potdar VA, Tiwari-Mishra M, Ashtekar RA, Kumari J, Walimbe A, Mohnot SM. Natural infection by simian retrovirus-6 (SRV-6) in Hanuman langurs (Semnopithecus entellus) from two different geographical regions of India. Virology 2003; 311:192-201. [PMID: 12832216 DOI: 10.1016/s0042-6822(03)00187-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
We have previously reported natural infection of Hanuman langurs (Semnopithecus entellus) from Lucknow, India by a novel simian retrovirus, SRV-6, a beta-retrovirus (type D retrovirus). Here we describe infection by a closely related SRV-6 in an isolated feral population of Hanuman langurs from Jodhpur in the Northwestern desert region of India. Serological analyses, using in-house ELISA and WB, genomic amplification, and sequencing of env region (gp70 and gp20) of the viral genome were carried out. SRV-6-infected langurs from the two regions were serologically cross-reactive. The env gene was used for phylogenetic analyses, being the most variable part of a retroviral genome. The surface glycoproteins (gp70) were almost identical between the two SRV-6 isolates and related to but distinct from equivalent regions from other exogenous SRVs. We could sequence the transmembrane glycoprotein gp20 from SRV-6 infecting the Jodhpur langurs, which was again shown to be related to but unique compared to the other known SRVs. The study suggests that natural infection by related strains of SRV-6 occurs in wild langurs from different parts of India.
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Affiliation(s)
- Jayashree S Nandi
- Department of Retrovirology, National Institute of Virology, Pune-411001, India
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9
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Abstract
Xenotransplantation, the transplantation of living organs, tissues, or cells from one species to another, is viewed as a potential solution to the existing shortage of human organs for transplantation. While whole-organ xenotransplantation is still in the preclinical stage, cellular xenotransplantation and extracorporeal perfusion applications are showing promise in early clinical trials. Advances in immunosuppressive therapy, gene engineering, and cloning of animals bring a broader array of xenotransplantation protocols closer to clinical trials. Despite several potential advantages over allotransplantation, xenotransplantation encompasses a number of problems. Immunologic rejection remains the primary hindrance. The potential to introduce infections across species barriers, another major concern, is the main focus of this review. Nonhuman primates are unlikely to be a main source for xenotransplantation products despite their phylogenetic proximity to humans. Genetically engineered pigs, bred under special conditions, are currently envisaged as the major source. Thus far, there has been no evidence for human infections caused by pig xenotransplantation products. However, the existence of xenotropic endogenous retroviruses and the clinical evidence of long-lasting porcine cell microchimerism indicate the potential for xenogeneic infections. Thus, further trials should continue under regulatory oversight, with close clinical and laboratory monitoring for potential xenogeneic infections.
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Affiliation(s)
- R S Boneva
- HIV/AIDS and Retrovirology Branch, Division of AIDS, STD and TB Laboratory Research, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia 30333, USA.
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10
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Nandi JS, Bhavalkar-Potdar V, Tikute S, Raut CG. A novel type D simian retrovirus naturally infecting the Indian Hanuman langur (Semnopithecus entellus). Virology 2000; 277:6-13. [PMID: 11062030 DOI: 10.1006/viro.2000.0567] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
As a simian species, the langurs are not known to harbor simian retroviruses, except for one report on a simian Type D endogenous retrovirus from the spectacled langur (Trachypithecus obscurus) from Malaysia. The present report describes for the first time natural infection of the common Hanuman langur (Semnopithecus entellus) from India by a novel simian retrovirus (SRV). The new SRV is phylogenetically related to but distinct from the three molecularly characterized serotypes, SRV 1-3, of the five known serotypes of SRVs, based on sequence analyses from the 3'orf and env regions of the viral genome. The novel SRV isolated from the Indian Hanuman langur is provisionally named SRV-6.
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Affiliation(s)
- J S Nandi
- Department of Retrovirology, National Institute of Virology, Pune, 411001, India
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11
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Rosenblum LL, Weiss RA, McClure MO. Virus load and sequence variation in simian retrovirus type 2 infection. J Virol 2000; 74:3449-54. [PMID: 10729117 PMCID: PMC111851 DOI: 10.1128/jvi.74.8.3449-3454.2000] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The natural history of type D simian retrovirus (SRV) infection is poorly characterized in terms of viral load, antibody status, and sequence variation. To investigate this, blood samples were taken from a small cohort of mostly asymptomatic cynomolgus macaques (Macaca fascicularis), naturally infected with SRV type 2 (SRV-2), some of which were followed over an 8-month period with blood taken every 2 months. Provirus and RNA virus loads were obtained, the samples were screened for presence of antibodies to SRV-2 and neutralizing antibody titers to SRV-2 were assayed. env sequences were aligned to determine intra- and intermonkey variation over time. Virus loads varied greatly among cohort individuals but, conversely, remained steady for each macaque over the 8-month period, regardless of their initial levels. No significant sequence variation was found within an individual over time. No clear picture emerged from these results, which indicate that the variables of SRV-2 infection are complex, differ from those for lentivirus infection, and are not distinctly related to disease outcome.
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Affiliation(s)
- L L Rosenblum
- Jefferiss Research Trust Laboratories, Imperial College of School of Medicine at St. Mary's, London W2 1NY, United Kingdom.
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12
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Marracci GH, Avery NA, Shiigi SM, Couch G, Palmer H, Pilcher KY, Nichols H, Hallick LM, Axthelm MK, Machida CA. Molecular cloning and cell-specific growth characterization of polymorphic variants of type D serogroup 2 simian retroviruses. Virology 1999; 261:43-58. [PMID: 10441555 DOI: 10.1006/viro.1999.9858] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Simian retroviruses (SRVs), the etiological agent of a spontaneous Simian acquired immunodeficiency syndrome, endemically infects large percentages of Asian macaques housed in biomedical research colonies and severely compromises the effective use of these species as a viable research animal. We recently described the molecular cloning of a serogroup 2 SRV, D2/RHE/OR, which causes mild immunosuppression in rhesus macaques. A restriction site variant, D2/RHE/OR/V1, has also been recovered from severely ill animals endemically infected with D2/RHE/OR. We now report the complete nucleotide sequences of D2/RHE/OR and D2/RHE/OR/V1. Both infectious molecular clones retain the genetic structure typical of type D SRVs (5' LTR-gag-prt-pol-env-3'LTR) and encode identically sized 8105-bp proviruses. D2/RHE/OR and D2/RHE/OR/V1 are 99.3% similar at the amino acid level, exhibiting only 17 residue differences, of which 10 are located in the envelope glycoproteins. The molecular clones and reciprocal chimeric viruses were used to assess the contribution of different genetic domains to virus infectivity in a T cell infection assay. These experiments indicate that D2/RHE/OR has a reduced ability to infect specific T cell lines, especially Hut-78 and MT-4 cells, and that the envelope gene is not the sole determinant of in vitro tropism.
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MESH Headings
- Amino Acid Sequence
- Animals
- Cells, Cultured
- Cloning, Molecular
- DNA, Recombinant
- Endopeptidases/genetics
- Genes, Viral
- Genes, env/genetics
- Genes, gag/genetics
- Genes, pol/genetics
- Genetic Variation
- Macaca
- Molecular Sequence Data
- Monkey Diseases/virology
- Polymorphism, Genetic
- Proviruses/genetics
- Retroviruses, Simian/classification
- Retroviruses, Simian/genetics
- Retroviruses, Simian/growth & development
- Sequence Analysis, DNA
- Simian Acquired Immunodeficiency Syndrome/virology
- T-Lymphocytes/virology
- Terminal Repeat Sequences/genetics
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Affiliation(s)
- G H Marracci
- Department of Molecular Microbiology and Immunology, Oregon Health Sciences University, Portland, Oregon, 97201, USA
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13
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Anderson DE, Torres JV. Simian retrovirus receptor and neutralization mechanism by antibodies to the envelope glycoprotein. Viral Immunol 1999; 12:47-56. [PMID: 10333242 DOI: 10.1089/vim.1999.12.47] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Type D simian retroviruses (SRV) cause an acquired immunodeficiency syndrome (AIDS) in monkeys. Results of infection with SRV range from complete recovery with absence of viremia to a viremic state, which produces AIDS-like symptoms and culminates in death. These varied outcomes render the interaction of the host and SRV an attractive model for the study of immunosuppressive retrovirus resulting in different pathologic consequences. We describe here the isolation and determination of the molecular weight of the receptor for SRV. We demonstrate that a cell receptor with the same molecular weight is bound by the envelope protein of all five serotypes of SRV. We also show that the receptor recognizes a region containing amino acids 142-167 of the envelope protein of SRV serotype 1 (SRV-1). In addition, we show that a different region of SRV serotype 2 (SRV-2) envelope protein containing amino acids 93-106, interacts with a cell receptor of identical molecular weight. Furthermore, polyclonal and monoclonal antibodies that are directed to envelope epitopes 142-167 of SRV-1 or to 93-106 of SRV-2, specifically neutralize only the respective viral serotype. Our results indicate that the neutralization of SRV infectivity by antibodies is achieved through blocking the interaction between the virus and its cell receptor.
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Affiliation(s)
- D E Anderson
- Department of Medical Microbiology and Immunology, School of Medicine, University of California, Davis 95616, USA
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