Ultrastructural changes in neuronal and glial cells in subacute sclerosing panencephalitis: correlation with disease duration.

This paper presents ultrastructural changes in neuronal and glial cells with special reference to intranuclear inclusion bodies in subacute sclerosing panencephalitis (SSPE) with different duration (from several weeks to seven years). Brain autopsy at ultrastructural level revealed the nucleocapsids of paramyxovirus in neuronal and oligodendroglial nuclei in 4 of 6 SSPE cases under study. Nucleocapsids of measles virus were present in two cases of disease lasting several weeks and in two cases with disease duration of two years, while abundant nuclear bodies and granulofilamentous inclusions in astrocytic nuclei were found in all cases. Occasionally, both granulofilamentous inclusions and complex nuclear bodies occurred in the same astrocytic nucleus. Only in the case lasting seven years they were not observed. It is likely that there is a structural and morphological relationship between these two types of inclusions present in astrocytic nuclei. Nuclear bodies and granulofilamentous inclusions were common and independent of the presence or absence of virus nucleocapsids. In the case of SSPE with a seven-year duration but without viral nucleocapsids in neuronal and oligodendroglial nuclei, neuronal tangles were observed.