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The role of the nucleus in the replication of measles virus.

The replication of measles and SSPE viruses in enucleate BSC-1 cells was measured by plaque assay, and the synthesis of virus-specific antigen was measured by indirect immunofluorescence. Titres of infectious virus produced in enucleate cells at 24 hours post inoculation (p.i.) were consistently 100-fold less, and the number of enucleate cells containing virus antigen at 30 hours p.i. was 10-fold less, than in nucleate control cultures. Enucleate cells at this time had 30% of the protein synthetic capacity of control nucleate cells, and supported the growth of Semliki Forest virus to titres equivalent to nucleate cell production.