Moulting hormone, juvenile hormone and the ultrastructure of the fat body of adult Sarcophaga bullata (Diptera)

Abstract

In the ovoviviparous fly, Sarcophaga bullata, vitellogenesis in cyclic; a process reflected in ultrastructural changes in the fat body cells and oenocytes. At eclosion the larval fat body has not yet completely disappeared. During vitellogenesis the fat body cells are specialized for intensive protein synthesis showing a very extensive RER and numerous invaginations of the plasma membrane. These features disappear when the eggs descend into the oviducts to complete embryogenesis. The predominant feature of the oenocytes is their very prominent SER. The fat body cells of the males are never as specialized for protein synthesis as those of the females. Feeding of ecdysterone to males for 3 or more days induces a rather extensive subcellular apparatus for protein synthesis, i.e., invaginations of the plasma membrane and an extensive RER. Juvenile hormone is completely ineffective in this respect. Both ecdysterone and juvenile hormone have pronounced but different effects on the oenocytes of males.

Considerations on some cytological and ultrastructural observations on fat cells ofDaphnia(Crustacea, Cladocera)

“…A comparable situation was found in the fat body cells of males and of pre-and postvitellogenic adult female insects (Odhiambo, 1967;Thomsen & Thomsen, 1974;Lauverjat, 1977;Behan & Hagedorn, 1978;Couble et al, 1979;Stoppie et al, 1981), and in subepidermal fat cells of males and sexual resting females of amphipod Orchestia gammarellus (Zerbib & Meusy, 1981;Meusy et al, 1983). Beside large glycogen reserves, the fat cells of these animals also show much less deve- Fig.…”

“…The cellular margin shows some slight projections or introflexions and rare pinocytotic pits. Similar general ultrastructural organization is visible in the cytoplasm of the fat body of adult female insects in the vitellogenic phase (De Loof & Lagasse, 1970;Thomsen & Thomsen, 1974;Lauverjat, 1977;Behan & Hagedorn, 1978;Couble et al, 1979;Stoppie et al, 1981), and of subepidermal fat cells of reproducing females (with oocytes in secondary vitellogenesis) of the amphipod Orchestia gammarellus (Zerbib & Meusy, 1981;Meusy et al, 1983). Since in these females the fat body cells or subepidermal fat cells synthesize vitellogenin, it is reasonable to assume that also the fat cells of parthenogenetic females of Daphnia are capable of vitellogenin synthesis.…”

A comparative study of fat body morphology in five mosquito species

“…aegypti (Martins et al 2011c) and other dipterans (Stoppie et al 1981, Johnson & Batterworth 1985. Another common finding is the absence of lipid droplets and glycogen granules in the oenocyte's cytoplasm (Sohal 1973, Tobe et al 1973, Stoppie et al 1981.…”

Morfo-histologia do corpo gorduroso perivisceral em adultos de Hedypathes betulinus (Klug, 1825) (Coleoptera, Cerambycidae)

“…Mesmo com a sua origem distinta, os enócitos são considerados, na maioria dos trabalhos, como sendo células pertencentes ao corpo gorduroso, que em insetos adultos podem secretar hormônios, lipídeos e estar envolvidos nos processos de desintoxicação do inseto. (SNODGRASS, 1 9 3 5 ; W I G G LES WO RT H , 1 9 7 4 ; STOPPIE et al, 1981;JOHNSON e BAT TERWORTH, 1985;CRUZ-LANDIM, 1983;DEAN et al, 1985;RUVOLO e CRUZ-LANDIM, 1993;PAES DE OLIVEIRA, 2002;CONTE, 1994, ZARA e CAETANO, 2004ROMA et al, 2005, ROLLO e CAMARGO-MATHIAS, 2006ROMA et al, 2006;ROMA, 2007). Diante das informações a respeito do corpo gorduroso, seus componentes celulares e suas funções, o presente estudo teve por objetivos identificar, descrever e caracterizar morfo-histologicamente as células do corpo gorduroso perivisceral de adultos de Hedypathes betulinus (Klug, 1825) (Coleoptera, Cerambycidae) e fornecer subsídios para futuros trabalhos envolvendo esta espécie.…”