Related Experiment Videos
Early hematologic changes in rhesus macaques (Macaca mulatta) infected with pathogenic and nonpathogenic isolates of
C P Mandell1, N C Jain, C J Miller
1Department of Clinical Pathology, School of Veterinary Medicine, University of California, Davis 95616.
Abstract:
Early hematologic changes were studied over a 14 day period in three groups of six rhesus macaques intravenously infected with pathogenic and nonpathogenic isolates of SIVmac. Abnormalities in blood included a mild blood loss anemia, sporadic lymphopenia, and variable CD4+ and CD8+ T lymphocyte numbers. Prominent bone marrow findings in macaques inoculated with pathogenic uncloned SIVmac and molecularly cloned pathogenic SIVmac-239 were hypercellularity, myeloid and megakaryocytic hyperplasia, and lymphoid aggregates. Infrequent mild morphologic abnormalities were present in macaques infected with a nonpathogenic molecular clone, SIVmac-1A11.
Insights
Early SIVmac infection in macaques caused mild anemia and T cell changes. Pathogenic isolates led to significant bone marrow abnormalities, unlike nonpathogenic ones.
Area of Science:
- Veterinary Medicine
- Immunology
- Primate Hematology
Background:
- Simian immunodeficiency virus (SIVmac) infection in rhesus macaques serves as a model for human immunodeficiency virus (HIV) pathogenesis.
- Understanding early hematologic and bone marrow responses is crucial for evaluating viral virulence.
Purpose of the Study:
- To investigate the early hematologic and bone marrow alterations in rhesus macaques following intravenous inoculation with pathogenic and nonpathogenic SIVmac isolates.
- To differentiate the effects of virulent versus avirulent SIVmac strains on blood cell counts and bone marrow morphology.
Main Methods:
- Three groups of six rhesus macaques each were intravenously infected with SIVmac isolates.
- Hematologic parameters and bone marrow findings were assessed over a 14-day period.
- Pathogenic (uncloned and SIVmac-239) and nonpathogenic (SIVmac-1A11) isolates were used.
Main Results:
- Mild anemia and sporadic lymphopenia were observed in infected macaques.
- Variable CD4+ and CD8+ T lymphocyte counts were noted.
- Macaques infected with pathogenic SIVmac isolates exhibited bone marrow hypercellularity, myeloid and megakaryocytic hyperplasia, and lymphoid aggregates.
- Macaques infected with the nonpathogenic SIVmac-1A11 clone showed only infrequent, mild morphologic abnormalities.
Conclusions:
- Pathogenic SIVmac isolates induce significant early hematologic and bone marrow changes in rhesus macaques.
- Nonpathogenic SIVmac isolates cause minimal hematologic alterations.
- These findings highlight the distinctpathogenic potential of different SIVmac strains and their impact on the hematopoietic system.