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[Molecular dialogue between human retroviruses and host cells]
1Laboratoire Infections Rétrovirales et Signalisation Cellulaire CRBM-CNRS UPR1086, Faculté de Médecine, Montpellier. devaux@crbm.cnrs-mop.fr
Abstract:
Several exogenous retroviruses are etiologic agents of severe human diseases. Retrovirus replication depends on a plethora of highly specific interactions with the host cell resulting in the subversion of multiple cellular signal transduction pathways. Understanding the molecular cross-talk that regulates the relationship between the virus and the host cell is currently the objective of many researchers and should contribute to gain insight into puzzling features of the physiopathology of retrovirus infections. A large body of recent data indicates that retroviruses utilize a variety of unrelated cell surface receptors to initiate infection and modulate the homeostasis of the target cell following receptors binding. As an example, I discuss here the tremendous capacity of HIV-1 envelope glycoproteins to modulate kinases activation and nuclear translocation of transcription factors following binding to surface receptors CD4 and CXCR4. Viral envelope glycoproteins interaction with CD4 controls cell activation and proliferation required for virus production whereas interaction with CXCR4 favors apoptosis thereby decreasing the host immune response.
Insights
Human retroviruses hijack host cells for replication, exploiting cell surface receptors like CD4 and CXCR4. HIV-1 envelope proteins manipulate these interactions to control cell fate, impacting disease progression.
Area of Science:
- Virology
- Molecular Biology
- Immunology
Background:
- Exogenous retroviruses cause severe human diseases.
- Retrovirus replication involves complex host-cell interactions and signal transduction pathway subversion.
- Understanding virus-host molecular crosstalk is crucial for deciphering retroviral physiopathology.
Purpose of the Study:
- To investigate the molecular mechanisms by which retroviruses interact with host cells.
- To elucidate how cell surface receptor binding by retroviruses modulates host cell homeostasis.
- To provide insight into the role of HIV-1 envelope glycoproteins in modulating host cell responses.
Main Methods:
- Review of recent data on retroviral cell surface receptor utilization.
- Analysis of molecular cross-talk between retroviruses and host cells.
- Focus on the function of HIV-1 envelope glycoproteins binding to CD4 and CXCR4.
Main Results:
- Retroviruses use diverse cell surface receptors to initiate infection.
- HIV-1 envelope glycoproteins modulate kinase activation and transcription factor nuclear translocation.
- Binding to CD4 promotes cell activation and proliferation, aiding virus production.
- Binding to CXCR4 induces apoptosis, diminishing the host immune response.
Conclusions:
- Retroviruses strategically exploit host cell surface receptors to manipulate cellular processes.
- HIV-1 envelope glycoproteins play a critical role in viral pathogenesis by altering host cell signaling and survival.
- Targeting these virus-receptor interactions could offer therapeutic strategies against retroviral infections.