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Metabolism of juvenile hormone in cultures of ovaries and fat body in the cockroach periplaneta americana



Metabolism of juvenile hormone in cultures of ovaries and fat body in the cockroach periplaneta americana



In Vitro (Rockville) 14(11): 956-960



Time course of juvenile hormone (JH) metabolism is examined in cultures of [newly emerged] P. americana fat body and ovaries in medium containing Manduca sexta carrier protein or cockroach hemolymph. In the absence of M. sexta carrier protein or cockroach hemolymph, both tissues extensively catabolize exogenous [3H]JH in the medium. Addition of the carrier protein or hemolymph to the culture system prevents the hydrolysis of the hormone in the medium. JH is degraded within the tissues whether or not carrier protein or hemolymph is present, suggesting that the protective role of these molecules is exclusively extracellular. Incubation of [3H]JH in medium preconditioned with tissue results in destruction of the hormone. The fat body may secrete esterases into the medium. The ovarioles hydrolyze the hormone by means of cell-associated enzymes. The relationship of these phenomena to insect development is discussed.

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Accession: 005884330

Download citation: RISBibTeXText

DOI: 10.1007/bf02616127



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