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Progressive multifocal leukoencephalopathy: JC virus detection by in situ hybridization compared with
Abstract:
In four cases of progressive multifocal leukoencephalopathy (PML), we compared biotin-labeled DNA:DNA in situ hybridization with peroxidase immunohistochemistry for the detection of JC virus (JCV). The localization of JCV DNA and JCV capsid protein was compared in formalin-fixed, paraffin-embedded brain tissues. Infected oligodendrocytes showed both JCV DNA and JCV protein. However, bizarre astrocytes demonstrated JCV capsid protein less often than JCV DNA. In situ hybridization with a biotinylated probe was as sensitive and specific as immunohistochemistry for diagnosis on formalin-fixed tissue. The presence of both JCV DNA and viral capsid protein in bizarre astrocytes suggests that these cells are neither truly transformed nor permissively infected, but are distinctively altered by JCV.
Insights
Comparing two methods for detecting JC virus (JCV) in progressive multifocal leukoencephalopathy (PML) brain tissue, in situ hybridization proved as effective as immunohistochemistry. Both techniques identified JCV DNA and protein in infected cells, offering new insights into JCV
Area of Science:
- Neurovirology
- Molecular Pathology
Background:
- Progressive multifocal leukoencephalopathy (PML) is a demyelinating disease caused by the JC virus (JCV).
- Accurate detection of JCV in affected tissues is crucial for diagnosis and understanding disease pathogenesis.
- Standard diagnostic methods include immunohistochemistry, but in situ hybridization offers an alternative for detecting viral nucleic acids.
Observation:
- This study compared biotin-labeled DNA:DNA in situ hybridization (ISH) with peroxidase immunohistochemistry (IHC) for JCV detection in formalin-fixed, paraffin-embedded brain tissues from four PML cases.
- Both JCV DNA and JCV capsid protein were localized in infected oligodendrocytes.
- Bizarre astrocytes, a characteristic feature of PML, showed JCV DNA more frequently than JCV capsid protein.
Findings:
- In situ hybridization demonstrated comparable sensitivity and specificity to immunohistochemistry for diagnosing JCV in formalin-fixed tissues.
- The co-localization of JCV DNA and capsid protein in bizarre astrocytes suggests a unique cellular response to JCV infection, distinct from permissive infection or transformation.
Implications:
- DNA:DNA in situ hybridization is a reliable and sensitive method for detecting JC virus in PML.
- The findings in bizarre astrocytes provide new insights into the pathogenesis of PML and the complex interaction between JCV and glial cells.
- This comparative study validates ISH as a valuable tool in neurovirological diagnostics.