Vitellogenin gene expression and hemolymph vitellogenin during vitellogenesis, final maturation, and oviposition in female kuruma prawn, Marsupenaeus japonicus

Okumura, Takuji; Yamano, Keisuke; Sakiyama, Kazutaka

doi:10.1016/j.cbpa.2007.03.011

Cited by 68 publications

(33 citation statements)

References 37 publications

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“…In O. quadrata, the acidophilic cytoplasm of mature oocytes can be attributed to the presence of large yolk granules in the periphery of the oocytes and smaller granules near the nuclei, as earlier reported in other crustaceans (López et al, '97;Peixoto et al, 2002;Dalabona and Silva, 2005). These acidophilic granules in the cytoplasm of mature oocytes showed positive PAS staining after amylase treatment, suggesting that, as in other crustaceans, the egg yolk is probably a glycolipoprotein (Kim et al, 2004;Okumura et al, 2007). This also suggests that, as described for males, this reserve is not used during vitellogenesis, but is spared to be used during embryonic development.…”

Section: Reproductive Cycle Of Ocypode Quadratasupporting

confidence: 75%

“…In female Cherax quadricarinatus, for example, the main circulating HDL is vitellogenin (Abdu et al, 2002). Depending on the species, vitellogenin can be synthesized in the hepatopancreas, ovaries, or both (Okumura et al, 2007), transported to the ovaries by receptor-mediated endocytosis (Mak et al, 2005), and once inside the ovaries, it is cleaved, forming lipovitellin subunits (Oberdörster et al, 2000;Okumura et al, 2007). Lipovitellin, in turn, is the major component of the egg yolk of most marine invertebrates (Komatsu and Ando, '92;Mak et al, 2005;Walker et al, 2006).…”

Section: Seasonal Variations In the Biochemical Composition Of Ocypodmentioning

confidence: 99%

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Seasonal variations in the biochemical composition and reproductive cycle of the ghost crab Ocypode quadrata (Fabricius, 1787) in Southern Brazil

et al. 2010

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The ghost crab, Ocypode quadrata, is found on sandy beaches from the United States to Southern Brazil. Because there is still little information about the metabolism and reproduction of O. quadrata on the southern coast of Brazil, the objectives of this study were to (i) evaluate the effect of seasonal variations on the carbohydrate, lipid, and protein metabolism of O. quadrata at Rondinha Beach, a beach with high anthropogenic activity, and to compare it with data from Siriú Beach, which has less human activity; and (ii) describe the effect of seasonal variations on the histological characteristics of male and female gonads, in order to assess the reproductive capacity of the crabs. The gonads of male crabs showed no significant variations in the gonadosomatic index (GSI) and glycogen levels; however, histological analysis of the testes revealed that they are mature in the summer. In females, the GSI and glycogen values are higher in summer, concomitantly with the presence of mature oocytes. These results suggest that the reproductive peak of O. quadrata occurs in summer. The seasonal analysis of the biochemical parameters, as well as comparison with Siriú Beach, demonstrated that the ghost crabs of Rondinha Beach have a different pattern of metabolism than those of Siriú. This difference may be a consequence of differences in the environmental conditions as well as in the anthropogenic pressures, such as vehicle traffic and the increase in human population at the beach in summer.

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Section: Reproductive Cycle Of Ocypode Quadratasupporting

confidence: 75%

Section: Seasonal Variations In the Biochemical Composition Of Ocypodmentioning

confidence: 99%

Seasonal variations in the biochemical composition and reproductive cycle of the ghost crab Ocypode quadrata (Fabricius, 1787) in Southern Brazil

et al. 2010

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“…One of the authors of this monograph determined that eyestalk ablation-removal of the source of CHH-increased CRP and MjTSP protein levels but did not affect their mRNA levels in the ovary of Mar. japonicus (Okumura et al 2007). Taken together with the fact that SOP, CRP, and MjTSP genes are transcribed and translated at different oocyte stages, these results indicate that expression of these genes is controlled at the translational level by CHH-family peptides.…”

Section: -3b Identification Of Cortical Rod Proteins In Penaeid Spementioning

confidence: 94%

“…This process has been histologically investigated in several crustacean species (for reviews, see Charniaux-Cotton and Payen 1988; Meusy and Payen 1988). One of the authors of this monograph has also studied ovarian development in relation to reproductive season and molt cycle in representative prawn species (Okumura et al 1992(Okumura et al , 2007Okumura and Aida 2000).…”

Section: -3 Modes Of Ovarian Maturationmentioning

confidence: 99%

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Reproductive Mechanisms in Crustacea Focusing on Selected Prawn Species: Vitellogenin Structure, Processing and Synthetic Control

Wilder¹,

Okumura²,

Tsutsui³

2010

Aqua-BioSci. Monogr. (ABSM)

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Shrimp culture is a significant world-wide industry, with current production levels reaching over 3 million tons per year. The expansion of the industry has given rise to the problems of environmental deterioration due to intensive-scale culture, and the outbreak of disease. While many of these issues are now being sufficiently addressed, the establishment of sustainable seed production technology is an area that should be given continued attention. In this regard, it remains difficult to control reproduction under hatchery conditions for a large number of commercially-important species. At present, an understanding of reproductive mechanisms in Crustacea is not complete, although in recent years, a great deal of knowledge has accumulated on vitellogenin structure, processing, and synthetic site in a number of economically-important species. This monograph will cover the current status of research on vitellogenin in decapod crustaceans, especially prawns and shrimp, and discuss mechanisms of vitellogenin synthetic control, both demonstrated and postulated. The monograph will also present current knowledge of crustacean vitellogenin receptors, and cover related facets of reproductive development, such as mechansisms of cortical rod formation and the utilization of vitellin during embryogenesis. Finally, future directions for this research and potential applications to aquaculture will be discussed.

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Induction of Ovarian Maturation in Penaeus monodon by Molecular Signal Interventional Approach

2012

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Vitellogenin (VTG) synthesis in the hepatopancreas and ovary is negatively regulated by vitellogenesis-inhibiting hormone (VIH) produced in the neurosecretory cell of X-organ/sinus gland complex of the eyestalks of penaeid shrimp. Eyestalk ablation is used commercially to induce ovarian maturation in shrimps which leads to an eventual loss of the spawner. The aim of the present study was to understand the molecular mechanism of VIH regulation in ovarian development and its inhibition of VTG gene expression by using a MEK-specific inhibitor (U0126). The real-time quantitative PCR results showed VTG mRNA level was progressively increased in the ovary and hepatopancreas of unilateral eyestalk-ablated and inhibitor-treated shrimps. Western blot analysis also showed that phosphoMEK was detected only in the unilateral eyestalk-ablated and control shrimp, whereas phospho-MEK was not detected in inhibitor-treated shrimp. DAX-1, SF-1, and StAR expression correlated with changes in VIH mRNA and altered phospho-ERK levels. This is consistent with the hypothesis that suppression of DAX-1 results in SF-1-mediated StAR protein upregulation of estradiol that is implicated in vitellogenesis. This is the first report that demonstrates the molecular mechanism of VIH suppression via MEK pathway to induce ovarian maturation in female Penaeus monodon by molecular signal intervention, a less-invasive method than traditional eyestalk ablation.

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Vitellogenin gene expression and hemolymph vitellogenin during vitellogenesis, final maturation, and oviposition in female kuruma prawn, Marsupenaeus japonicus

Cited by 68 publications

References 37 publications

Seasonal variations in the biochemical composition and reproductive cycle of the ghost crab Ocypode quadrata (Fabricius, 1787) in Southern Brazil

Seasonal variations in the biochemical composition and reproductive cycle of the ghost crab Ocypode quadrata (Fabricius, 1787) in Southern Brazil

Reproductive Mechanisms in Crustacea Focusing on Selected Prawn Species: Vitellogenin Structure, Processing and Synthetic Control

Induction of Ovarian Maturation in Penaeus monodon by Molecular Signal Interventional Approach

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