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Isolation of human immunodeficiency virus-related simian immunodeficiency viruses from African green monkeys
Abstract:
We have isolated lentivirus strains that are related to the human immunodeficiency virus (HIV) from African green monkeys (Cercopithecus aethiops; AGM). Although immunologically related, these SIVagm are clearly distinct from other simian immunodeficiency virus (SIV) isolates, including isolates from Macaca mulatta (SIVmac) or even from other AGM. The SIVagm strains described in this communication grow well in a limited number of human T-lymphoma lines. Virus density, morphology, and reverse transcriptase activity are characteristic of the lentivirus group. SIVagm exhibits the following pattern of major virus proteins: p18, p28, gp45, p64, gp140. They appear to bind to the target cell via the CD4 or its primate analogue. Four virus isolates have already been molecularly cloned for detailed genomic analysis and within this SIV agm group they exhibit the genomic variability that is typical of lentiviruses. AGMs infected with this virus apparently remain healthy and therefore SIVagm not only provides a virus model for vaccine studies but also allows investigation of the defense mechanisms (immunological and others) that keep the AGMs healthy. Furthermore, precise genomic analysis of these and other SIV strains will lead to a better understanding of the evolution and pathogenicity of human lentiviruses like HIV.
Insights
Researchers identified novel simian immunodeficiency virus (SIV) strains in African green monkeys (AGM). These SIVagm are distinct lentiviruses, offering insights into human immunodeficiency virus (HIV) evolution and potential vaccine development.
Area of Science:
- Virology
- Immunology
- Primate Retroviruses
Background:
- Human immunodeficiency virus (HIV) is a lentivirus responsible for AIDS.
- Simian immunodeficiency virus (SIV) is closely related to HIV and found in various non-human primates.
- Understanding SIV diversity is crucial for HIV research and vaccine development.
Purpose of the Study:
- To isolate and characterize novel lentivirus strains from African green monkeys (AGM).
- To investigate the distinct immunological and genomic properties of these SIVagm isolates.
- To explore the potential of SIVagm as a model for studying lentivirus evolution, pathogenicity, and host defense mechanisms.
Main Methods:
- Isolation and cultivation of lentivirus strains from AGM.
- Characterization of virus morphology, density, and reverse transcriptase activity.
- Analysis of major viral protein patterns and cell-binding interactions (CD4 receptor).
- Molecular cloning of four SIVagm isolates for genomic variability assessment.
Main Results:
- Novel SIVagm strains, distinct from other SIV isolates, were successfully isolated from AGM.
- These SIVagm strains exhibit characteristic lentivirus properties and grow in specific human T-lymphoma lines.
- Genomic analysis revealed variability within the SIVagm group, typical of lentiviruses.
- AGMs infected with SIVagm remain healthy, suggesting effective host defense mechanisms.
Conclusions:
- SIVagm represents a distinct lentivirus group with unique characteristics.
- SIVagm serves as a valuable model for lentivirus research, including vaccine studies and understanding host immunity.
- Genomic analysis of SIVagm contributes to understanding the evolution and pathogenicity of human lentiviruses like HIV.