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. 1987 Apr;61(4):1007–1018. doi: 10.1128/jvi.61.4.1007-1018.1987

Alterations in nuclear matrix structure after adenovirus infection.

Z H Zhai, J A Nickerson, G Krochmalnic, S Penman
PMCID: PMC254057  PMID: 3820360

Abstract

Infection of HeLa cells with adenovirus serotype 2 causes rearrangements in nuclear matrix morphology which can best be seen by gentle cell extraction and embedment-free section electron microscopy. We used these techniques to examine the nuclear matrices and cytoskeletons of cells at 6, 13, 28, and 44 h after infection. As infection progressed, chromatin condensed onto the nucleoli and the nuclear lamina. Virus-related inclusions appeared in the nucleus, where they partitioned with the nuclear matrix. These virus centers consisted of at least three distinguishable areas: amorphously dense regions, granular regions whose granulations appeared to be viral capsids, and filaments connecting these regions to each other and to the nuclear lamina. The filaments became decorated with viral capsids of two different densities, which may be empty capsid shells and capsids with DNA-protein cores. The interaction of some capsids with the filaments persisted even after lysis of the cell. We propose that granulated virus-related structures are sites of capsid assembly and storage and that the filaments may be involved in the transport of capsids and capsid intermediates. The nuclear lamina became increasingly crenated after infection, with some extensions appearing to bud off and form blebs of nuclear material in the cytoplasm. The perinuclear cytoskeleton became rearranged after infection, forming a corona of decreased filament number around the nucleus. In summary, we propose that adenovirus rearranges the nuclear matrix and cytoskeleton to support its own replication.

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