UCP4 expression changes in larval and pupal fat bodies of the beetle Zophobas atratus under adipokinetic hormone treatment

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• 作者：Malgorzata Slocinska ; Nina Antos-Krzeminska ; Marek Golebiowski ; Mariola Kuczer ; Piotr Stepnowski ; Grzegorz Rosinski ; Wieslawa Jarmuszkiewicz
• 关键词：AKH ; adipokinetic hormone ; Tenmo-AKH ; bioanalog of the AKH hormone family ; UCP(1&ndash ; 5) ; uncoupling proteins ; isoforms 1&ndash ; 5 ; ZaUCP4 ; uncoupling protein of Zophobas atratus
• 刊名：Comparative Biochemistry and Physiology - Part A: Molecular & Integrative Physiology
• 出版年：2013
• 出版时间：September, 2013
• 年：2013
• 卷：166
• 期：1
• 页码：52-59
• 全文大小：590 K

文摘

We investigated the influence of adipokinetic hormone (AKH), an insect neurohormone, on uncoupling protein 4 (ZaUCP4) expression and activity in larval and pupal fat body mitochondria of the beetle Zophobas atratus in relation to intermediary metabolism. Homologous Tenmo-AKH was administered to the beetle larvae and pupae as either a single dose or as two doses of 20 pmol during a 24 h interval. In the larval and pupal fat bodies, downregulation of ZaUCP4 expression at the mRNA and protein levels was observed 24 h and 48 h after AKH treatment, respectively. In both developmental stages, ZaUCP4 activity was lowered in fat body mitochondria 48 h after AKH treatment. In the AKH-injected larvae, changes in ZaUCP4 expression were accompanied by the mobilization of carbohydrate reserves, no change in the concentration of total lipids and an increase in the free fatty acid level. In contrast, AKH had no effect on carbohydrate metabolism in the pupal fat body but induced lipid mobilization. It seems that AKH influences ZaUCP4 expression by triggering multiple events and that it has different physiological roles in controlling intermediary metabolism in the fat body of the beetle larvae and pupae.