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CD4/GP120mac251 interaction induces phospholipase A2 (PLA2) activation in cynomolgus monkey lymphocytes
E Mavoungou1, V Poaty-Mavoungou
1Unit of Immunology, International Center for Medical Research, Franceville (CIRMF), Gabon. emavoung@cirmfrv.fr
Abstract:
Cynomolgus monkey are susceptible to infection with select simian immunodeficiency virus (SIV). We investigated the early interactions between SIV envelope glycoproteins (gp120mac251) and macaque lymphocytes. Our results demonstrate that the soluble viral glycoprotein induce a specific phospholipase A2 (PLA2) activation in lymphocytes through CD4. This PLA2 activation, induced after envelope glycoprotein-CD4 interaction, because of its locally destabilizing membrane effect, may have important implications for preparing the lymphocyte membrane for fusion with the viral particle. However, this effect is not sufficient to accomplish fusion. These data indicate that the specific step of fusion may be downstream from PLA2 activation.
Insights
Simian immunodeficiency virus (SIV) envelope glycoproteins activate phospholipase A2 (PLA2) in macaque lymphocytes via CD4. This activation may prepare lymphocyte membranes for viral fusion, but is not sufficient for the fusion process itself.
Area of Science:
- Virology
- Immunology
- Cell Biology
Background:
- Cynomolgus macaques are susceptible to simian immunodeficiency virus (SIV) infection.
- Understanding early viral-host interactions is crucial for developing interventions.
Purpose of the Study:
- To investigate the early molecular interactions between SIV envelope glycoproteins and macaque lymphocytes.
- To elucidate the role of phospholipase A2 (PLA2) activation in SIV-macrophage interactions.
Main Methods:
- Utilized SIV envelope glycoproteins (gp120mac251) and macaque lymphocytes.
- Assessed the activation of PLA2 in lymphocytes following glycoprotein exposure.
- Investigated the role of CD4 in mediating the interaction.
Main Results:
- Soluble SIV envelope glycoproteins induce specific PLA2 activation in lymphocytes through CD4.
- This PLA2 activation causes a local destabilizing effect on the lymphocyte membrane.
- The observed PLA2 activation is not sufficient to cause viral fusion.
Conclusions:
- CD4-mediated interaction with SIV envelope glycoproteins triggers PLA2 activation in lymphocytes.
- PLA2 activation may prime lymphocyte membranes for subsequent viral fusion.
- Viral fusion appears to be a downstream event occurring after PLA2 activation.