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• W2000506063 abstract "Extracts of brain-ventral nerve cord and fat body from Manduca sexta larvae throughout the fifth (last) instar were assayed for polyamine content and ornithine decarboxylase (ODC) activity. At the beginning of the instar, ODC, the rate limiting enzyme in polyamine biosynthesis, exhibited elevated activity in both tissues, although the specific activity of the enzyme was far greater in the fat body than in the nervous system. ODC activity in these tissues gradually declined to low levels by day 5, and remained low until day 9, just prior to pupation, when activity rose. No ODC activity was detected in low speed, cell free supernatants of hemolymph. HPLC-dansyl analysis of the fat body revealed that levels of the three polyamines, i.e. putrescine, spermidine and spermine, were elevated during the first half of the instar, a period characterized by rapid growth. On day 4 of the instar, polyamine levels in the fat body fell. The concentrations of spermine and spermidine remained low in the fat body for the remainder of larval life, while the putrescine level increased again to peak levels during the prepupal stage. In a similar fashion, neural spermidine and spermine were at their highest concentration early in the instar during the period of neuronal proliferation and were reduced as the growth phase ended. The quantities of both spermidine and putrescine increased in the brain-nerve cord as the animals approached pupation, a time when differentiative neurogenesis begins. The relative levels of the three polyamines in insect tissues appear to be: spermidine > putrescine > spermine. This clearly differs from the situation in vertebrates where spermine ⩾ spermidine > putrescine. Further, Manduca hemolymph yielded extremely high concentrations of putrescine, and to a lesser extent, spermidine, features apparently unique to insect hemolymph. The data support the concept that polyamines act as intracellular regulators in modulating the program of insect growth and metamorphosis." @default.
• W2000506063 created "2016-06-24" @default.
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• W2000506063 date "1988-01-01" @default.
• W2000506063 modified "2023-10-16" @default.
• W2000506063 title "Temporal alterations in polyamine content and ornithine decarboxylase activity during the larval-pupal development of Manduca sexta" @default.
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• W2000506063 doi "https://doi.org/10.1016/0020-1790(88)90110-2" @default.
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