The effect of juvenile hormone III, methyl farnesoate, and methoprene on Na/K-ATPase activity in larvae of the brine shrimp, Artemia.
1. Ion transport enzyme (Na/K-ATPase) activity in stage III larvae of the brine shrimp, Artemia, remains elevated throughout the stadium when populations are exposed to methoprene in artificial seawater. 2. Infusion of methoprene, juvenile hormone, or methyl farnesoate causes increased Na/K-ATPase activity in homogenates of mid-stadium larvae that would otherwise exhibit low activity. 3. The sensitivity of the enzyme system to extremely low concentrations of the juvenoids suggests that this may be a common mode of action of these compounds. Additionally it suggests that the enzyme may be under the influence of a similar compound present in the larvae.
Department of Entomology, Washington State University, Pullman 99164-6432.
J S
JS
Ahl
J J
JJ
Brown
D000818:Animals; D001156:Artemia / Q000201:enzymology*; D001692:Biological Transport; D005231:Fatty Acids, Unsaturated / Q000494:pharmacology*; D007605:Juvenile Hormones / Q000494:pharmacology*; D007814:Larva / Q000201:enzymology*; D008726:Methoprene / Q000494:pharmacology*; D012717:Sesquiterpenes / Q000494:pharmacology*; D000254:Sodium-Potassium-Exchanging ATPase / Q000378:metabolism*
D005231:Fatty Acids, Unsaturated; D007605:Juvenile Hormones; D012717:Sesquiterpenes; C032429:methyl farnesoate; D008726:Methoprene; C036585:juvenile hormone III; D000254:Sodium-Potassium-Exchanging ATPase