Polybrene-mediated transfection of cultured lepidopteran cells: Induction of a Drosophila heat shock promoter

J. C. Helgen, Ann Marie Fallon

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17 Scopus citations

Abstract

We have introduced hsp-cat plasmid DNA into Spodoptera frugiperda (Lepidoptera: Noctuidae) cells by transfection with purified DNA (1 to 48 μg/ml) mixed with the polycation polybrene (100 μg/ml) in serum-free Grace's medium. The hsp-cat construct contains a gene coding for the bacterial enzyme chloramphenicol acetyltransferase (CAT), whose expression is controlled by a promoter derived from a Drosophila heat shock protein (hsp) gene. Expression of CAT activity in transfected Spodoptera cells was induced by a 2-h heat shock at 43°C. The temperature of the heat shock was based on conditions that maximized the expression of endogenous heat shock protein genes in these cells. CAT activity was maximal in cells that were exposed to the heat shock 2 d after transfection; by 4 d, activity was diminished, and little activity was detectable after 6 d. Transfection frequencies, which varied with DNA concentration and ranged as high as 6000 per million cells, were determined using a histochemical staining procedure.

Original languageEnglish (US)
Pages (from-to)731-736
Number of pages6
JournalIn Vitro Cellular & Developmental Biology
Volume26
Issue number7
DOIs
StatePublished - Jul 1 1990

Keywords

  • Spodoptera frugiperda
  • heat shock
  • lepidopteran cells
  • polybrene
  • transfection

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