Juvenile hormone mediates lipid storage in the oocytes of Dipetalogaster maxima

0554919 - BC 2022 RIV GB eng J - Journal Article
Ramos, F.O. - Leyria, J. - Nouzová, Marcela - Fruttero, L.L. - Noriega, F. G. - Canavoso, L.E.
Juvenile hormone mediates lipid storage in the oocytes of Dipetalogaster maxima.
Insect Biochemistry and Molecular Biology. Roč. 133, JUN 2021 (2021), č. článku 103499. ISSN 0965-1748. E-ISSN 1879-0240
Institutional support: RVO:60077344
Keywords : rhodnius-prolixus * panstrongylus-megistus * vitellogenin receptor * molecular characterization * insect oocytes * follicle cells * atp synthase * beta-chain * lipophorin * hemiptera * Lipophorin * Triatomine * Oogenesis * Juvenile hormone * Lipid metabolism * Endocytic receptors
OECD category: Biochemistry and molecular biology
Impact factor: 4.421, year: 2021
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S0965174820301880?via%3Dihub

Triatomines are vectors of Chagas disease and important model organisms in insect physiology. Kissing bugs are obligatory hematophagous insects. A blood meal is required to successfully complete oogenesis, a process primarily controlled by juvenile hormone (JH). We used Dipetalogaster maxima as an experimental model to further understand the roles of JH in the regulation of vitellogenesis and oogenesis. A particular focus was set on the role of JH controlling lipid and protein recruitment by the oocytes. The hemolymph titer of JH III skipped bisepoxide increased after a blood meal. Following a blood meal there were increased levels of mRNAs in the fat body for the yolk protein precursors, vitellogenin (Vg) and lipophorin (Lp), as well as of their protein products in the hemolymph, mRNAs of the Vg and Lp receptors (VgR and LpR) were concomitantly up-regulated in the ovaries. Topical administration of JH induced the expression of Lp/LpR and Vg/VgR genes, and prompted the uptake of Lp and Vg in pre-vitellogenic females. Knockdown of the expression of LpR by RNA interference in fed females did not impair the Lp-mediated lipid transfer to oocytes, suggesting that the bulk of lipid acquisition by oocytes occurred by other pathways rather than by the endocytic Lp/LpR pathway. In conclusion, our results strongly suggest that JH signaling is critical for lipid storage in oocytes, by regulating Vg and Lp gene expression in the fat body as well as by modulating the expression of LpR and VgR genes in ovaries.
Permanent Link: http://hdl.handle.net/11104/0329539