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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1 February 2000
ADAPTATION OF AN INSECT CELL LINE OF SPODOPTERA FRUGIPERDA TO GROW AT 37° C: CHARACTERIZATION OF AN ENDODIPLOID CLONE
MURIEL GERBAL,
PHILIPPE FOURNIER,
PATRICK BARRY,
MARCEL MARILLER,
FRANÇOISE ODIER,
GÉRARD DEVAUCHELLE,
MARTINE DUONOR-CERUTTI
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In Vitro Cellular & Developmental Biology - Animal
Vol. 36 • No. 2
February 2000
Vol. 36 • No. 2
February 2000
chromosomes
genome size
heat shock proteins
hyperthermia
karyotype
lipids