乳草蝽的甾醇组成以及植物甾醇的利用与代谢

Sterol composition and phytosterol utilization and metabolism in the milkweed bug.

作者信息

Svoboda J A, Dutky S R, Robbins W E, Kaplanis J N

出版信息

Lipids. 1977 Mar;12(3):318-21. doi: 10.1007/BF02533356.

Abstract

Analysis of the sterols of the milkweed bug, Oncopeltus fasciatus (Dallas) and dietary sunflowerseeds revealed that there is little, if any, conversion of dietary C28 OR C29 phytosterols to cholesterol in this phytophagous insect. The dietary sterols are apparently utilized with little alteration both during development to the adult stage and egg production, and cholesterol comprises less than 1% of the sterols in either adult males and females or in the eggs. The significance of these findings are discussed in light of the recent discovery that the C28-ecdysone, makisterone A, is the predominant molting hormone inthe embryonated egg of the milkweed bug.

摘要

对乳草蝽（Oncopeltus fasciatus，达拉斯）及作为食物的向日葵种子中的甾醇进行分析后发现，在这种植食性昆虫中，食物中的C28或C29植物甾醇几乎没有转化为胆固醇（即便有转化，量也极少）。在发育至成虫阶段以及产卵过程中，食物中的甾醇显然几乎没有改变就被利用了，胆固醇在成年雄虫、雌虫以及卵中的含量均不到甾醇总量的1%。鉴于最近发现C28蜕皮激素——玛氏甾酮A是乳草蝽受精卵中的主要蜕皮激素，对这些发现的意义进行了讨论。