The ecdysteroids from the tobacco hornworm during pupal-adult development five days after peak titer of molting hormone activity. |
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Authors: | J N Kaplanis M J Thompson S R Dutky W E Robbins |
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Institution: | Insect Physiology Laboratory, Agricultural Research, SEA, USDA Beltsville, Maryland 20705 USA |
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Abstract: | Six naturally occurring C27 ecdysteroids were isolated and identified from the tobacco hornworm during pupal-adult development five days after peak titer of molting hormone activity. In order of decreasing quantities the hormones were: 20,26-dihydroxyecdysone, 3-epi-20-hydroxyecdysone, 20hydroxyecdysone, 3-epi-20,26-dihydroxyecdysone, 3-epi-ecdysone, and ecdysone. 20-Hydroxyecdysone, in an earlier study, was the major molting hormone present at peak titer during pupal-adult development. The major ecdysteroid present during embryonic development in this insect, 26-hydroxyecdysone, was not detected. The copresence of all six of these ecdysteroids from a single developmental stage of an insect provides information on the metabolic interrelationships that exist among these steroids and on their possible function(s) in insects. The 3alpha-ecdysteroids were far less active than the 3 beta-epimers in the house fly assay. The significance of epimerization is discussed. |
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Keywords: | Ecdysone 20-Hydroxyecdysone 26-Hydroxyecdysone 20 26-Dihydroxyecdysone 3-Epi-ecdysone 3-Epi-20-hydroxyecdysone 3-Epi-20 26-dihydroxyecdysone 3-Dehydroecdysone 3-Dehydro-20-hydroxyecdysone |
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