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Ultrastructural changes associated with retroviral replication in central nervous system capillary endothelial cells
Abstract:
Widespread ultrastructural alterations in the vascular basal lamina were found in the central nervous system of symptomatic mice infected with three different neuropathogenic murine leukemia viruses. These changes appeared to progress in frequency and severity in parallel with the progression of spongiform lesions and clinical symptoms. Accumulations of pleomorphic, apparently degenerating, virions were frequently seen within areas that showed marked aberrations from the normal basal lamina ultrastructure. We suggest that the observed retrovirus-associated ultrastructural changes in the endothelial basal lamina may alter normal physiologic functions and thus play a primary role in the pathogenesis of retrovirus-induced spongiform disease.
Insights
Neuropathogenic murine leukemia viruses cause widespread changes in the vascular basal lamina of the central nervous system in mice. These retrovirus-induced alterations correlate with disease severity and may drive spongiform disease pathogenesis.
Area of Science:
- Neurovirology
- Pathology
- Cellular Biology
Background:
- Neuropathogenic murine leukemia viruses (MLVs) are known to cause central nervous system (CNS) disease in mice.
- Spongiform lesions and clinical neurological symptoms are characteristic of MLV-induced CNS disease.
- The precise mechanisms underlying retroviral pathogenesis in the CNS remain under investigation.
Purpose of the Study:
- To investigate the ultrastructural changes in the CNS vasculature during MLV infection.
- To determine the correlation between vascular basal lamina alterations and disease progression.
- To explore the potential role of these ultrastructural changes in retrovirus-induced spongiform disease.
Main Methods:
- Transmission electron microscopy was used to examine the CNS vascular basal lamina in infected mice.
- Ultrastructural analysis focused on identifying aberrations from normal basal lamina morphology.
- Correlation analysis was performed between the severity of vascular changes and clinical/histopathological findings.
Main Results:
- Widespread ultrastructural alterations in the vascular basal lamina were observed in the CNS of symptomatic mice infected with neuropathogenic MLVs.
- These vascular changes increased in frequency and severity, paralleling the progression of spongiform lesions and clinical symptoms.
- Degenerating retroviral particles (virions) were frequently found within areas exhibiting significant basal lamina aberrations.
Conclusions:
- The study identified significant ultrastructural changes in the endothelial basal lamina associated with retroviral infection in the CNS.
- These retrovirus-associated alterations in the vascular basal lamina may disrupt normal physiological functions.
- It is proposed that these endothelial basal lamina changes play a primary role in the pathogenesis of retrovirus-induced spongiform disease.