Summary
The susceptibility of giant cells which had been induced by 1000 to 4000 r of gamma irradiation from a Cobalt60 source was studied in comparison to unirradiated cultures. Three human lines were utilized: a synovial cell (McCoy), an amnion (Fernandes) and a fetal lung (Nakanishi). In the amnion line a complete cytopathogenic effect was observed in the giant cells at the beginning of the third day after inoculation as compared to a similar effect produced on the fifth for the corresponding unirradiated control elements. A similar difference of two days was noted for the synovial cells. The virus titers of the amnion line were similar while the synovial cells produced a difference of approximately one logarithm for the virus obtained from the giant elements. The peak for the viral titer was reached earlier with the use of the irradiated cells.
After treatment with 2000 r of gamma irradiation, the fetal lung strain which had not been found susceptible to bluetongue virus showed a complete cytopathogenic effect four days following virus inoculation.
Giant cells were observed with phase contrast microscopy and following staining in order to study the lesions caused by the virus. Time-lapse phase contrast cinematography was also employed in the study of the giant cell-virus system. No specific lesions were observed.
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This research was supported by funds provided under Contract AF 41(657)-198 with the School of Aviation Medicine, USAF, Randolph Air Force Base, Texas.
Fellow of the Instituto de Alta Cultura and the Fundaçaõ Calouste Gulbenkian of Lisbon, Portugal. Permanent address: Laboratorio Nacional de Investigação Veterinária, Lisbon, Portugal.
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Fernandes, M.V. Irradiation of cells in tissue culture. Zeitschrift für Zellforschung 50, 433–443 (1959). https://doi.org/10.1007/BF00336567
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DOI: https://doi.org/10.1007/BF00336567