(Vtgs) are large serum glycolipophosphoproteins (=360 KDa) synthesized in the liver by all oviparous vertebrates in response to estrogen induction during oocyte maturation (Hiramatsu et al., 2006; Palumbo et al., 2007) and are commonly presented as heterodimer molecules in the bloodstream of females (Polzonetti-Magni et al, 2004; Finn, 2007).
Then, the objective of this work was to investigate the effects of human insulin and 20E on some indicators of reproduction (vitellogenins
, vitellins, ovarian ecdysteroids and reproductive potential) due to the role of these hormones on this process (Riehle and Brown, 1999; Maniere et al., 2004; De Loof, 2008; Belles and Piulachs, 2015).
The peptide sequences identified as vitellogenins
(Vtgs) by mass spectrometry are each found in the full-length Vtg2 sequence (Appendix Fig.
Gender-specific expression of multiple estrogen receptors, growth hormone receptors, insulin-like growth factors and vitellogenins
, and effects of 17 beta-estradiol in the male tilapia (Oreochromis mossambicus).Gen Comp Endocrinol., 1;156(3): 544-51.
littoralis, also inhibited the synthesis of vitellogenins
(i.e., proteins which are precursors of vitellin) or their transport with a consequent decrease in hatchability.
This observed reduction in fecundity suggests that humoral antibodies, somehow, interfere with the normal process of oogenesis as the ovarian proteins/ insect vitellogenins
are synthesized by the female fat body and are transferred in the hemolymph; these vitellogenins
are then selectively sequestered to the developing oocytes by receptor mediated endocytosis and are stored in yolk granules (24).
and vitellins in the bean bug, Riptortus clavatus (Hemiptera: Alydidae): purification, immunological identification, and induction by juvenile hormone.
Among their topics are the biosynthesis and processing of insect vitellogenins
, the regulation of yolk protein gene expression and vitellogenesis in higher diptera, vitellogenesis directed by juvenile hormone, the accumulation of lipids in insect oocytes, the regulation of yolk protein degradation during insect enbryogenesis, and biochemical and ultrastructural aspects of vitellin utilization during embryogensis.
in the fresh water mussel Elliptio complananta, Boston University, Society for the Study of Reproduction, Annual Meeting.
Several genes known to be activated by this process include those that encode the ER itself, vitellogenins
(Vtgs), and choriogenins (Arukwe et al.
During vitellogenesis, the fat body of Acheta domesticus produces and secretes two multisubunit vitellogenins
(VGs; 352 kDa and 357 kDa) into the hemolymph.