Related Experiment Videos
Novel human herpesviruses and multiple sclerosis
A Rotola1, E Caselli, E Cassai
1Department of Experimental and Diagnostic Medicine, Section of Microbiology, University of Ferrara, Italy.
Abstract:
It has been suggested that human herpesvirus 6 (HHV-6) might be involved in the pathogenesis of multiple sclerosis (MS). However, studies of the association between HHV-6 and MS are hindered by the difficulty in discriminating between latent and active infection. We undertook a study to determine whether HHV-6 establish a systemic active infection in the course of MS, and to investigate possible roles of HHV-7, a herpesvirus closely related to HHV-6. To discriminate between latent and active infection, we analysed viral transcription. The results indicate that both viruses are prevalent in PBMCs of MS patients as in healthy controls, and that viral sequences are maintained in a non-transcriptional state. These observations indicate that further studies should define the state of viral persistence in the central nervous system.
Insights
Human herpesvirus 6 (HHV-6) and HHV-7 do not appear to cause active systemic infection in multiple sclerosis (MS) patients. Viral sequences in PBMCs remain in a non-transcriptional state, suggesting further research into CNS viral persistence is needed.
Area of Science:
- Virology
- Neuroimmunology
- Infectious Diseases
Background:
- The potential role of human herpesvirus 6 (HHV-6) in multiple sclerosis (MS) pathogenesis is debated.
- Distinguishing between latent and active HHV-6 infection is challenging, complicating association studies.
- Human herpesvirus 7 (HHV-7), a related virus, also warrants investigation in the context of MS.
Purpose of the Study:
- To determine if HHV-6 establishes a systemic active infection during the course of MS.
- To investigate the potential role of HHV-7 in MS.
- To differentiate between latent and active viral infections by analyzing viral transcription.
Main Methods:
- Analysis of viral transcription in peripheral blood mononuclear cells (PBMCs).
- Comparison of viral prevalence and transcriptional states in MS patients and healthy controls.
- Focus on differentiating latent versus active HHV-6 and HHV-7 infections.
Main Results:
- Both HHV-6 and HHV-7 were found to be prevalent in PBMCs of MS patients and healthy controls.
- Viral sequences in PBMCs were consistently maintained in a non-transcriptional state.
- No evidence of systemic active infection by HHV-6 or HHV-7 was detected in MS patients.
Conclusions:
- The study suggests that HHV-6 and HHV-7 do not establish systemic active infections in MS patients.
- Viral persistence in PBMCs appears to be in a latent, non-transcriptional state.
- Further research is required to elucidate the state of viral persistence within the central nervous system (CNS) in MS.