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Acute lymphoid changes and ongoing immune activation in SIV infection
1Center for Interdisciplinary Research in Immunology and Disease, University of California, Los Angeles School of Medicine 90024-1747.
Journal of Acquired Immune Deficiency Syndromes
|January 1, 1992
Summary
Simian immunodeficiency virus (SIV) infection causes a temporary CD4 T-cell drop and CD8 T-cell increase. Immune cell activation, marked by elevated neopterin, correlates with SIV disease progression.
Area of Science:
- Immunology
- Virology
- Primatology
Background:
- Simian immunodeficiency virus (SIV) infection in non-human primates serves as a model for human immunodeficiency virus (HIV) infection.
- Understanding SIV pathogenesis is crucial for developing effective treatments and vaccines for lentiviral infections.
Purpose of the Study:
- To characterize the temporal dynamics of immune cell changes and activation during SIV infection.
- To investigate the relationship between immune activation markers and disease progression in SIV-infected rhesus macaques.
Main Methods:
- Monitoring of CD4 and CD8 T-cell counts and activation markers (HLA-DR, CD25, CD78).
- Measurement of serum immune activation markers including neopterin and beta 2-microglobulin.
- Observation of B-cell dynamics throughout the course of infection.
Main Results:
- SIV infection induced a transient decrease in CD4 T cells and a rise in CD8 T cells within the first 4 weeks.
- Significant immune cell activation, indicated by increased serum neopterin and HLA-DR expression on CD8 T cells, was observed.
- Late-stage infection showed increased B-cell numbers and reduced expression of CD25 on CD4 T cells.
Conclusions:
- SIV infection leads to both T-cell deficiency and persistent immune activation, suggesting these are key pathogenic processes.
- Immune activation markers, such as neopterin, may correlate with the duration of SIV illness.