Summary
Sf21 and Sf9 cell lines established from the lepidoptera Spodoptera frugiperda do not display major induction of heat shock proteins when exposed to a temperature of 37°C. After some months of adaptation at 37°C we obtained two new cell lines, Sf21-HT and SF9-HT, which have now been established for several years in our laboratory. The Sf9-HT line displays a slightly shorter doubling time at 37°C than the wild type at 28°C, but cell lethality gives rise to an earlier growth arrest. The composition of total lipid extract from heat-adapted cells reveals a higher sphingomyelin to phosphatidylcholine ratio and a higher percentage of saturated fatty acids, which are expected for the lower membrane fluidity, required for thermotolerance. The cell volume of Sf9-HT is doubled, and by flow cytometry we showed that the DNA content is twice that in the parental cell line. Karyotypic examination of metaphasic cells achieved under epifluorescence microscopy revealed a doubled chromosome number in Sf9-HT.
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Gerbal, M., Fournier, P., Barry, P. et al. Adaptation of an insect cell line of Spodoptera frugiperda to grow at 37°C: Characterization of an endodiploid clone. In Vitro Cell.Dev.Biol.-Animal 36, 117–124 (2000). https://doi.org/10.1290/1071-2690(2000)036<0117:AOAICL>2.0.CO;2
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DOI: https://doi.org/10.1290/1071-2690(2000)036<0117:AOAICL>2.0.CO;2