Modulation of host cell activation during feline immunodeficiency virus (FIV) infection
L Silvotti1, L Kramer, A Corradi
1Istituto di Anatomia Patologica Veterinaria, Università di Parma, Italy.
Insights
Feline immunodeficiency virus (FIV) infection stimulates lymphocyte proliferation in cats. Early FIV infection modulates host cell activation, impacting feline immune responses and disease progression.
Area of Science:
- Veterinary Virology
- Immunology
- Cell Biology
Background:
- Feline immunodeficiency virus (FIV) is an important pathogen affecting domestic cats.
- Understanding the early mechanisms of FIV pathogenesis is crucial for developing effective treatments.
- Lymphocyte activation plays a key role in immune responses to viral infections.
Purpose of the Study:
- To investigate the mitogenic effects of FIV infection on feline lymphocytes.
- To examine the in vitro and in vivo cellular changes associated with FIV infection.
- To elucidate the early events of FIV-induced host cell modulation.
Main Methods:
- In vitro studies using feline resting peripheral blood lymphocytes (PBL).
- In vivo studies in experimentally FIV-infected cats.
- Analysis of cell cycle progression (G1 phase) and expression of cell-cycle markers (p53, p56).
- Histopathological examination of lymph nodes for germinal center activity and CD30 expression.
Main Results:
- FIV-infected PBL showed increased recruitment into the G1 phase of the cell cycle.
- Upregulation of cell-cycle markers p53 and p56 was observed in infected PBL.
- In vivo, FIV infection led to increased germinal center activity and CD30 expression in lymph nodes, indicating B-cell activation.
Conclusions:
- FIV infection induces lymphocyte activation, both in vitro and in vivo.
- Early FIV infection involves the modulation of host cell activation pathways.
- These findings suggest potential mechanisms contributing to FIV pathogenesis and immune dysregulation.
Abstract:
The authors describe the mitogenic effect of feline immunodeficiency virus (FIV) infection (1) in vitro, on feline resting peripheral blood lymphocytes (PBL), and (2) in vivo, in experimentally infected cats. Infected PBL were more readily recruited than non-infected PBL, into the G1 phase of the cell cycle and showed increased expression of the specific cell-cycle markers p53 and p56. In-vivo lymphocyte activation following FIV infection was demonstrated by increased germinal centre activity in infected lymph nodes, together with a high expression of CD30, a B-cell activation marker. These results suggest that early events in FIV infection include modulation of host cell activation. Possible implications for pathogenesis are discussed.
