The juvenile hormone analogue, methoprene, inhibits ecdysterone induction of small heat shock protein gene expression.
The small heat shock protein (hsp) genes of Drosophila are expressed in cultured cells in response to the moulting hormone, ecdysterone. We show here that juvenile hormone (JHIII) and the juvenile hormone analogue, methoprene, inhibit that induction in a dose-dependent manner. Heat shock induction is not inhibited. In transient expression studies using S3 line cells transfected with EcRE-CAT constructs, methoprene inhibition was found to require a 2-hr pretreatment (before ecdysterone addition), and methoprene's continued presence was essential. Farnesol, farnesyl acetate, and retinoic acid did not cause inhibition. Several models of methoprene inhibition are discussed.
Berger
E M
EM
Department of Biology, Dartmouth College, Hanover, New Hampshire 03755.
Goudie
K
K
Klieger
L
L
Berger
M
M
DeCato
R
R
D000818:Animals; D015500:Chloramphenicol O-Acetyltransferase / Q000235:genetics; D004330:Drosophila / Q000235:genetics; D004441:Ecdysterone / Q000037:antagonists & inhibitors / Q000235:genetics*; D005786:Gene Expression Regulation / Q000187:drug effects*; D006360:Heat-Shock Proteins / Q000037:antagonists & inhibitors / Q000096:biosynthesis / Q000235:genetics*; D007700:Kinetics; D008726:Methoprene / Q000494:pharmacology*; D010957:Plasmids; D011995:Recombination, Genetic
D006360:Heat-Shock Proteins; D004441:Ecdysterone; D008726:Methoprene; D015500:Chloramphenicol O-Acetyltransferase