Viral and Host Deoxyribonucleic Acid Synthesis in Shope Fibroma Virus-infected Cells as Studied by Means of High-Resolution Autoradiography
AUTOR(ES)
Scherrer, Raoul
RESUMO
Incorporation of 3H-thymidine by BSC-1 cells infected with Shope fibroma virus was studied by means of high-resolution electron microscopic radioautography. One-hour pulses with the radioactive precursor were given at various times after infection, during a one-step growth cycle of the virus. In the cytoplasm of infected cells, reacted grains occurred over foci of viroplasm; these foci are believed to represent the true sites of viral deoxyribonucleic acid (DNA) replication. Shope fibroma virus DNA synthesis began before 3 hr postinfection, reached a maximum at 8 to 9 hr, and then declined rapidly. It was demonstrated that the decline in 3H-thymidine uptake is correlated with the onset of viral morphogenesis. In comparison with the noninfected culture, the nuclear labeling, which reflects host DNA metabolism, was slightly reduced by 4 hr postinfection. Inhibition became more marked as infection progressed, and host DNA synthesis was almost completely suppressed in late stages of viral development.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=375487Documentos Relacionados
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