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Tan K, Ma X, Su B, Zhan C, Yang X, Waiho K, Lim LS, Kwan KY. Targeting TtVgR via siRNA Knockdown Elicits Ovarian Cell Death in the Tri-spine Horseshoe Crab. Mar Biotechnol (NY) 2024:10.1007/s10126-024-10319-7. [PMID: 38676851 DOI: 10.1007/s10126-024-10319-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2023] [Accepted: 04/17/2024] [Indexed: 04/29/2024]
Abstract
The vitellogenin present in the bloodstream undergoes internalization into developing oocytes through the vitellogenin receptor (VgR), a process mediated by receptor-mediated endocytosis. VgR plays a crucial role in facilitating the accumulation of vitellogenin and the maturation of oocytes. In this study, we characterized a Tachypleus tridentatus vitellogenin receptor (TtVgR) gene from the tri-spine horseshoe crab, revealing a length of 1956 bp and encoding 652 amino acid residues with 12 exons. TtVgR has a molecular weight of 64.26 kDa and an isoelectric point of 5.95. Predictions indicate 85 phosphorylation sites and 7 glycosylation sites within TtVgR. Transcriptional analysis demonstrated specific expression of TtVgR in the ovary and yellow connective tissue. TtVgR was identified and distributed in the plasma membrane of oocytes. The siRNA-mediated TtVgR knockdown significantly reduced the transcriptional activity of TtVgR. This depletion induced excessive ROS production, resulting in DNA damage in ovarian primary cells. TUNEL and flow cytometry analyses confirmed ovarian cell apoptosis following TtVgR knockdown, indicating DNA damage in ovarian primary cells. These findings underscore the importance of TtVgR in ovarian cell development, suggesting its potential involvement in vitellogenesis and oocyte maturation. This knowledge may inform innovative breeding strategies and contribute to the sustainable management and conservation of the tri-spine horseshoe crab.
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Affiliation(s)
- Kianann Tan
- Guangxi Key Laboratory of Beibu Gulf Marine Biodiversity Conservation, College of Marine Sciences, Beibu Gulf University, Qinzhou City, 535011, Guangxi, China
| | - Xiaowan Ma
- Key Laboratory of Tropical Marine Ecosystem and Bioresource, Ministry of Natural Resources, Fourth Institute of Oceanography, Beihai, 536000, Guangxi, China
| | - Boyu Su
- Guangxi Key Laboratory of Beibu Gulf Marine Biodiversity Conservation, College of Marine Sciences, Beibu Gulf University, Qinzhou City, 535011, Guangxi, China
| | - Chen Zhan
- Guangxi Key Laboratory of Beibu Gulf Marine Biodiversity Conservation, College of Marine Sciences, Beibu Gulf University, Qinzhou City, 535011, Guangxi, China
| | - Xin Yang
- Guangxi Key Laboratory of Beibu Gulf Marine Biodiversity Conservation, College of Marine Sciences, Beibu Gulf University, Qinzhou City, 535011, Guangxi, China
| | - Khor Waiho
- Higher Institution Centre of Excellence (HICoE), Institute of Tropical Aquaculture and Fisheries, Universiti Malaysia Terengganu, 21030, Kuala Nerus City, Terengganu, Malaysia
| | - Leong-Seng Lim
- Borneo Marine Research Institute, Universiti Malaysia Sabah, Kota Kinabalu City, Sabah, Malaysia
| | - Kit Yue Kwan
- Guangxi Key Laboratory of Beibu Gulf Marine Biodiversity Conservation, College of Marine Sciences, Beibu Gulf University, Qinzhou City, 535011, Guangxi, China.
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Babio L, Damsteegt EL, Lokman PM. Lipoprotein receptors in ovary of eel, Anguilla australis: molecular characterisation of putative vitellogenin receptors. Fish Physiol Biochem 2023; 49:117-137. [PMID: 36648592 PMCID: PMC9935665 DOI: 10.1007/s10695-023-01169-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Accepted: 01/04/2023] [Indexed: 06/17/2023]
Abstract
Lipoprotein receptors, including low-density lipoprotein receptor (LDLr) relatives (Lrs) and LDLr-related proteins (Lrps), belong to the LDLr supergene family and participate in diverse physiological functions. In this study, novel sequences of lr and lrp genes expressed in the ovary of the short-finned eel, Anguilla australis, during early gonadal development are presented. The genes encoding the LDLr-like, Lrp1-like, Lrp1b-like, Lrp3, Lrp4-like, Lrp5-like, Lrp6, Lrp10, Lrp11, Lrp12-like, and Lr11-like proteins were found and identified by sequence and structure analysis, in addition to phylogenetic analysis. Genes encoding proteins previously implicated in follicle development and vitellogenin (Vtg) uptake in oviparous vertebrates were also identified, i.e. lr8 (including lr8 + and lr8- variants) and lrp13; their identification was reinforced by conserved synteny with orthologues in other teleost fish. Compared to other lr/lrp genes, the genes encoding Lr8 + , Lr8-, and Lrp13 were highly expressed in ovary during early development, decreasing as oocyte development advanced when induced by hypophysation. Furthermore, lr8 + , lr8-, and lrp13 were dominantly expressed in the ovary when compared with 17 other tissues. Finally, this study successfully detected the expression of both lr8 variants, which showed different expression patterns to those reported in other oviparous vertebrates and provided the first characterisation of Lrp13 in Anguilla sp. We propose that lr8 + , lr8-, and lrp13 encode putative Vtg receptors in anguillid eels.
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Affiliation(s)
- Lucila Babio
- Department of Zoology, University of Otago, 340 Great King Street, P.O. Box 56, Dunedin, Otago 9054 New Zealand
| | - Erin L. Damsteegt
- Department of Zoology, University of Otago, 340 Great King Street, P.O. Box 56, Dunedin, Otago 9054 New Zealand
| | - P. Mark Lokman
- Department of Zoology, University of Otago, 340 Great King Street, P.O. Box 56, Dunedin, Otago 9054 New Zealand
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Namgung J, Mizuta H, Yamaguchi Y, Nagata J, Todo T, Yilmaz O, Hiramatsu N. Knock out of a major vitellogenin receptor gene with eight ligand binding repeats in medaka (Oryzias latipes) using the CRISPR/Cas9 system. Comp Biochem Physiol A Mol Integr Physiol 2021; 257:110967. [PMID: 33895320 DOI: 10.1016/j.cbpa.2021.110967] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Revised: 04/19/2021] [Accepted: 04/19/2021] [Indexed: 11/16/2022]
Abstract
Recent studies of vitellogenesis engendered a novel model of teleost yolk formation in which multiple yolk precursors, vitellogenins (Vtgs), and their receptors (Vtgrs) interact to ensure proper yolk composition for embryonic development and larval growth. As a step toward verification of this concept, we examined the role of one candidate Vtgr, termed low-density lipoprotein receptor relative with eight ligand-binding repeat (Lr8), in the medaka, a representative teleost and established laboratory model. A homozygous lr8 knock out (lr8-KO) medaka was produced to perform reverse-genetic functional analyses. In ovaries of wild type (WT) medaka, Western blotting detected a putative Lr8 protein band at ~130 kDa, while immunohistochemistry detected the putative Lr8 signal at the periphery of the oocyte underneath the zona radiata. These signals disappeared in ovaries of the lr8-KO group. Offspring of lr8-KO medaka exhibited decreased survival rate compared to WT fish, but KO of lr8 was not 100% lethal. There was no significant difference in total yolk protein content or size of eggs between WT and lr8-KO fish. However, LC-MS/MS analyses revealed a remarkable decrease in the relative abundance of yolk proteins derived from VtgAb in lr8-KO eggs, in conjunction with a compensatory increase in proteins derived from VtgAa1. These findings strongly support the conclusion that Lr8 is an important receptor for VtgAb in medaka. The disruption of proper yolk composition by lr8-KO is possibly one cause of the low offspring survival.
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Affiliation(s)
- Jin Namgung
- Graduate School of Fisheries Sciences, Hokkaido University, 3-1-1 Minato, Hakodate, Hokkaido 041-8611, Japan
| | - Hiroko Mizuta
- Graduate School of Fisheries Sciences, Hokkaido University, 3-1-1 Minato, Hakodate, Hokkaido 041-8611, Japan
| | - Yo Yamaguchi
- Graduate School of Fisheries Sciences, Hokkaido University, 3-1-1 Minato, Hakodate, Hokkaido 041-8611, Japan
| | - Jun Nagata
- Mariculture Fisheries Research Institute, Fisheries Research Department, Hokkaido Research Organization, 1-4-1 Masuura, Abashiri, Hokkaido 099-3119, Japan
| | - Takashi Todo
- Division of Marine Life Sciences, Faculty of Fisheries Sciences, Hokkaido University, 3-1-1 Minato, Hakodate, Hokkaido 041-8611, Japan
| | - Ozlem Yilmaz
- Institute of Marine Research, Austevoll Research Station, Storebø, Norway
| | - Naoshi Hiramatsu
- Division of Marine Life Sciences, Faculty of Fisheries Sciences, Hokkaido University, 3-1-1 Minato, Hakodate, Hokkaido 041-8611, Japan.
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Zhu Z, Tong C, Qiu B, Yang H, Xu J, Zheng S, Song Q, Feng Q, Deng H. 20E-mediated regulation of BmKr-h1 by BmKRP promotes oocyte maturation. BMC Biol 2021; 19:39. [PMID: 33632227 PMCID: PMC7905918 DOI: 10.1186/s12915-021-00952-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2020] [Accepted: 01/06/2021] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND Krüppel homolog 1 (Kr-h1) is a critical transcription factor for juvenile hormone (JH) signaling, known to play a key role in regulating metamorphosis and adult reproduction in insects. Kr-h1 can also be induced by molting hormone 20-hydroxyecdysone (20E), however, the underlying mechanism of 20E-induced Kr-h1 expression remains unclear. In the present study, we investigated the molecular mechanism of Kr-h1 induction by 20E in the reproductive system of a model lepidopteran insect, Bombyx mori. RESULTS Developmental and tissue-specific expression analysis revealed that BmKr-h1 was highly expressed in ovaries during the late pupal and adult stages and the expression was induced by 20E. RNA interference (RNAi)-mediated depletion of BmKr-h1 in female pupae severely repressed the transcription of vitellogenin receptor (VgR), resulting in the reduction in vitellogenin (Vg) deposition in oocytes. BmKr-h1 specifically bound the Kr-h1 binding site (KBS) between - 2818 and - 2805 nt upstream of BmVgR and enhanced the transcription of BmVgR. A 20E cis-regulatory element (CRE) was identified in the promoter of BmKr-h1 and functionally verified using luciferase reporter assay, EMSA and DNA-ChIP. Using pull-down assays, we identified a novel transcription factor B. mori Kr-h1 regulatory protein (BmKRP) that specifically bound the BmKr-h1 CRE and activated its transcription. CRISPR/Cas9-mediated knockout of BmKRP in female pupae suppressed the transcription of BmKr-h1 and BmVgR, resulting in arrested oogenesis. CONCLUSION We identified BmKRP as a new transcription factor mediating 20E regulation of B. mori oogenesis. Our data suggests that induction of BmKRP by 20E regulates BmKr-h1 expression, which in turn induces BmVgR expression to facilitate Vg uptake and oogenesis.
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Affiliation(s)
- Zidan Zhu
- Guangdong Key Laboratory of Insect Developmental Biology and Applied Technology, Guangzhou Key Laboratory of Insect Development Regulation and Application Research, Institute of Insect Science and Technology & School of Life Sciences, South China Normal University, Guangzhou, 510631, China
| | - Chunmei Tong
- Guangdong Key Laboratory of Insect Developmental Biology and Applied Technology, Guangzhou Key Laboratory of Insect Development Regulation and Application Research, Institute of Insect Science and Technology & School of Life Sciences, South China Normal University, Guangzhou, 510631, China
| | - Binbin Qiu
- Guangdong Key Laboratory of Insect Developmental Biology and Applied Technology, Guangzhou Key Laboratory of Insect Development Regulation and Application Research, Institute of Insect Science and Technology & School of Life Sciences, South China Normal University, Guangzhou, 510631, China
| | - Hongguang Yang
- Guangdong Key Laboratory of Insect Developmental Biology and Applied Technology, Guangzhou Key Laboratory of Insect Development Regulation and Application Research, Institute of Insect Science and Technology & School of Life Sciences, South China Normal University, Guangzhou, 510631, China
| | - Jiahui Xu
- Guangdong Key Laboratory of Insect Developmental Biology and Applied Technology, Guangzhou Key Laboratory of Insect Development Regulation and Application Research, Institute of Insect Science and Technology & School of Life Sciences, South China Normal University, Guangzhou, 510631, China
| | - Sichun Zheng
- Guangdong Key Laboratory of Insect Developmental Biology and Applied Technology, Guangzhou Key Laboratory of Insect Development Regulation and Application Research, Institute of Insect Science and Technology & School of Life Sciences, South China Normal University, Guangzhou, 510631, China
| | - Qisheng Song
- Division of Plant Sciences, University of Missouri, Columbia, MO, 65211, USA
| | - Qili Feng
- Guangdong Key Laboratory of Insect Developmental Biology and Applied Technology, Guangzhou Key Laboratory of Insect Development Regulation and Application Research, Institute of Insect Science and Technology & School of Life Sciences, South China Normal University, Guangzhou, 510631, China.
| | - Huimin Deng
- Guangdong Key Laboratory of Insect Developmental Biology and Applied Technology, Guangzhou Key Laboratory of Insect Development Regulation and Application Research, Institute of Insect Science and Technology & School of Life Sciences, South China Normal University, Guangzhou, 510631, China.
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Sun W, Li L, Li H, Zhou K, Li W, Wang Q. Vitellogenin receptor expression in ovaries controls innate immunity in the Chinese mitten crab (Eriocheir sinensis) by regulating vitellogenin accumulation in the hemolymph. Fish Shellfish Immunol 2020; 107:480-489. [PMID: 32920203 DOI: 10.1016/j.fsi.2020.09.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 08/14/2020] [Accepted: 09/07/2020] [Indexed: 06/11/2023]
Abstract
The vitellogenin receptor (Vgr), which is specific for vitellogenin (Vtg), recognises and transports Vtg into the ovaries. Accumulating evidence suggests that Vtg also performs an immune defence function and plays critical roles in innate immunity in oviparous animals. However, whether Vgr is involved in innate immunity in the Chinese mitten crab (Eriocheir sinensis) is unknown. In this study, we obtained a 3009 nucleotide partial cDNA of the E. sinensis vitellogenin receptor gene (Es-vgr) encoding an open reading frame of 1003 amino acid residues. Bioinformatics analysis showed that the domains of Es-vgr were conserved during evolution. Quantitative real-time PCR and western blotting revealed that the highest Es-vgr expression levels occurred in the ovary, and expression was specific. Comparison of the expression levels of Es-vgr and the Vtg gene (Es-vtg1) at different ovary developmental stages suggested that there may be some regulatory relationship between them. Bacterial challenge induced high-level expression of antimicrobial peptide genes and reduced Es-vgr expression in ovaries, resulting in massive accumulation of Vtg in the hemolymph. The survival rate of crabs increased significantly after injection with recombinant Es-vtg1 protein following bacterial infection. Collectively, these results demonstrate that Es-vgr plays critical roles in antimicrobial function by regulating the accumulation of Vtg in the hemolymph.
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Affiliation(s)
- Weikang Sun
- Laboratory of Invertebrate Immunological Defense & Reproductive Biology, School of Life Sciences, East China Normal University, Shanghai, China
| | - Lu Li
- Laboratory of Invertebrate Immunological Defense & Reproductive Biology, School of Life Sciences, East China Normal University, Shanghai, China
| | - Hao Li
- Laboratory of Invertebrate Immunological Defense & Reproductive Biology, School of Life Sciences, East China Normal University, Shanghai, China
| | - Kaimin Zhou
- Laboratory of Invertebrate Immunological Defense & Reproductive Biology, School of Life Sciences, East China Normal University, Shanghai, China
| | - Weiwei Li
- Laboratory of Invertebrate Immunological Defense & Reproductive Biology, School of Life Sciences, East China Normal University, Shanghai, China.
| | - Qun Wang
- Laboratory of Invertebrate Immunological Defense & Reproductive Biology, School of Life Sciences, East China Normal University, Shanghai, China.
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Shen G, Chen E, Ji X, Liu L, Liu J, Hua X, Li D, Xiao Y, Xia Q. The POU Transcription Factor POU-M2 Regulates Vitellogenin Receptor Gene Expression in the Silkworm, Bombyx mori. Genes (Basel) 2020; 11:E394. [PMID: 32268540 PMCID: PMC7230888 DOI: 10.3390/genes11040394] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Revised: 04/01/2020] [Accepted: 04/03/2020] [Indexed: 01/15/2023] Open
Abstract
Vitellogenin receptors (VgRs) play critical roles in egg formation by transporting vitellogenin (Vg) into oocytes in insects. Although the function of VgR in insects is well studied, the transcriptional regulation of this gene is still unclear. Here, we cloned the promoter of the VgR gene from Bombyx mori (BmVgR), and predicted many POU cis-response elements (CREs) in its promoter. Electrophoretic mobility shift and chromatin immunoprecipitation assays showed that the POU transcription factor POU-M2 bound directly to the CREs of the promoter. Overexpression of POU-M2 in an ovarian cell line (BmNs) enhanced BmVgR transcription and promoter activity detected by quantitative reverse transcription PCR and luciferase reporter assays. Analyses of expression patterns indicated that POU-M2 was expressed in ovary at day two of wandering stage initially, followed by BmVgR. RNA interference of POU-M2 significantly reduced the transcription of BmVgR in ovary and egg-laying rate. Our results suggest a novel function for the POU factor in silkworm oogenesis by its involvement in BmVgR regulation and expands the understanding of POU factors in insect VgR expression.
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Affiliation(s)
- Guanwang Shen
- Biological Science Research Center, Southwest University, Chongqing 400716, China; (G.S.); (E.C.); (L.L.); (J.L.); (X.H.); (D.L.); (Y.X.)
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400716, China
- Chongqing Key Laboratory of Sericulture Science, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Chongqing 400716, China
| | - Enxiang Chen
- Biological Science Research Center, Southwest University, Chongqing 400716, China; (G.S.); (E.C.); (L.L.); (J.L.); (X.H.); (D.L.); (Y.X.)
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400716, China
- Chongqing Key Laboratory of Sericulture Science, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Chongqing 400716, China
| | - Xiaocun Ji
- Research Center of Bioenergy & Bioremediation, College of Resources and Environment, Southwest University, Chongqing 400716, China;
| | - Lina Liu
- Biological Science Research Center, Southwest University, Chongqing 400716, China; (G.S.); (E.C.); (L.L.); (J.L.); (X.H.); (D.L.); (Y.X.)
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400716, China
- Chongqing Key Laboratory of Sericulture Science, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Chongqing 400716, China
| | - Jianqiu Liu
- Biological Science Research Center, Southwest University, Chongqing 400716, China; (G.S.); (E.C.); (L.L.); (J.L.); (X.H.); (D.L.); (Y.X.)
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400716, China
- Chongqing Key Laboratory of Sericulture Science, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Chongqing 400716, China
| | - Xiaoting Hua
- Biological Science Research Center, Southwest University, Chongqing 400716, China; (G.S.); (E.C.); (L.L.); (J.L.); (X.H.); (D.L.); (Y.X.)
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400716, China
- Chongqing Key Laboratory of Sericulture Science, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Chongqing 400716, China
| | - Dan Li
- Biological Science Research Center, Southwest University, Chongqing 400716, China; (G.S.); (E.C.); (L.L.); (J.L.); (X.H.); (D.L.); (Y.X.)
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400716, China
- Chongqing Key Laboratory of Sericulture Science, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Chongqing 400716, China
| | - Yingdan Xiao
- Biological Science Research Center, Southwest University, Chongqing 400716, China; (G.S.); (E.C.); (L.L.); (J.L.); (X.H.); (D.L.); (Y.X.)
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400716, China
- Chongqing Key Laboratory of Sericulture Science, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Chongqing 400716, China
| | - Qingyou Xia
- Biological Science Research Center, Southwest University, Chongqing 400716, China; (G.S.); (E.C.); (L.L.); (J.L.); (X.H.); (D.L.); (Y.X.)
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400716, China
- Chongqing Key Laboratory of Sericulture Science, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Chongqing 400716, China
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Guo H, Chen LL, Li GL, Deng SP, Zhu CH. Accumulation and Depuration of Nonylphenol and Its Effect on the Expressions of Vitellogenin and Vitellogenin Receptor in Freshwater Prawn Macrobrachium rosenbergii. Bull Environ Contam Toxicol 2019; 103:729-733. [PMID: 31531704 DOI: 10.1007/s00128-019-02714-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Accepted: 09/05/2019] [Indexed: 06/10/2023]
Abstract
Accumulation of nonylphenol (NP) in hepatopancreas, gonad, eyestalk, and muscle of freshwater prawn Macrobrachium rosenbergii following 72 h exposure to 100 µg/L NP, and depuration of NP in these tissues at 0.5-192 h post exposure were examined. We also examined the expressions of vitellogenin (Vg) and vitellogenin receptor (VgR) of prawn following 0-20 days exposure to 0, 1, 10, and 100 µg/L NP. NP accumulation in hepatopancreas and gonad with high concentration, and low concentration in muscle, but depurated faster in eyestalk and muscle. The expressions of vitellogenin (Vg) and vitellogenin receptor (VgR) increased directly with dose and time. In conclusion, NP accumulated significantly in gonad together with high Vg and VgR expressions, and depurated slow in hepatopancreas and gonad when prawns were removed back to control water. The induction of Vg and VgR under NP exposure might be a stress response in M. rosenbergii.
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Affiliation(s)
- Hui Guo
- Guangdong Research Center on Reproductive Control and Breeding Technology of Indigenous Valuable Fish Species, College of Fisheries, Guangdong Ocean University, Mazhang District, Haida Road No. 1, Zhanjiang, 524025, Guangdong, People's Republic of China
| | - Luan-Luan Chen
- Guangdong Research Center on Reproductive Control and Breeding Technology of Indigenous Valuable Fish Species, College of Fisheries, Guangdong Ocean University, Mazhang District, Haida Road No. 1, Zhanjiang, 524025, Guangdong, People's Republic of China
| | - Guang-Li Li
- Guangdong Research Center on Reproductive Control and Breeding Technology of Indigenous Valuable Fish Species, College of Fisheries, Guangdong Ocean University, Mazhang District, Haida Road No. 1, Zhanjiang, 524025, Guangdong, People's Republic of China
| | - Si-Ping Deng
- Guangdong Research Center on Reproductive Control and Breeding Technology of Indigenous Valuable Fish Species, College of Fisheries, Guangdong Ocean University, Mazhang District, Haida Road No. 1, Zhanjiang, 524025, Guangdong, People's Republic of China
| | - Chun-Hua Zhu
- Guangdong Research Center on Reproductive Control and Breeding Technology of Indigenous Valuable Fish Species, College of Fisheries, Guangdong Ocean University, Mazhang District, Haida Road No. 1, Zhanjiang, 524025, Guangdong, People's Republic of China.
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Umemiya-Shirafuji R, Mihara R, Fujisaki K, Suzuki H. Intracellular localization of vitellogenin receptor mRNA and protein during oogenesis of a parthenogenetic tick, Haemaphysalis longicornis. Parasit Vectors 2019; 12:205. [PMID: 31060579 PMCID: PMC6501394 DOI: 10.1186/s13071-019-3469-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Accepted: 04/29/2019] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Vitellogenin (Vg), a key molecule for oocyte development synthesized in the fat body during blood-feeding, is released into the hemolymph and then taken into the oocytes via Vg receptor (VgR) in ticks. Previously, we showed that VgR mRNA is expressed in the ovary at the adult stage of parthenogenetic Haemaphysalis longicornis ticks and its expression increases after blood-feeding. However, intracellular localization of VgR mRNA and protein at each developmental stage of oocytes during oogenesis remains largely unclear. METHODS mRNA and protein expression profiles of H. longicornis VgR (HlVgR) in the oocytes from the unfed to oviposition periods were analyzed by real-time PCR, in situ hybridization, and immunostaining. To elucidate the timing of the onset of Vg uptake, RNA interference (RNAi)-mediated gene silencing of HlVgR was performed. RESULTS In situ hybridization revealed that HlVgR mRNA was detected in the cytoplasm of stage I-III oocytes, and weaker positive signals for HlVgR mRNA were found in the cell periphery of stage IV and V oocytes. Likewise, HlVgR protein was detected by immunostaining in the cytoplasm of stage I-III oocytes and in the cell periphery of stage IV and V oocytes. Each developmental stage of the oocytes showed distinct patterns of mRNA and protein expression of HlVgR. Moreover, RNAi of HlVgR caused delayed or arrested development in the oocytes. The ovaries of control ticks showed all developmental stages of oocytes, whereas stage I-III oocytes were found in the ovaries of HlVgR-RNAi ticks at 5 days after engorgement. CONCLUSIONS These results suggest that active uptake of Vg is required for development from stage III to stage IV during oogenesis. Our data clearly revealed an apparent shift in the intracellular localization of VgR for both mRNA and protein level in oocytes during oogenesis.
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Affiliation(s)
- Rika Umemiya-Shirafuji
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-Cho, Obihiro, Hokkaido, 080-8555, Japan
| | - Ryo Mihara
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-Cho, Obihiro, Hokkaido, 080-8555, Japan
| | - Kozo Fujisaki
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-Cho, Obihiro, Hokkaido, 080-8555, Japan.,National Agricultural and Food Research Organization, Kannondai 3-1-5, Tsukuba, Ibaraki, 305-0856, Japan
| | - Hiroshi Suzuki
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-Cho, Obihiro, Hokkaido, 080-8555, Japan.
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Hussein HE, Johnson WC, Taus NS, Suarez CE, Scoles GA, Ueti MW. Silencing expression of the Rhipicephalus microplus vitellogenin receptor gene blocks Babesia bovis transmission and interferes with oocyte maturation. Parasit Vectors 2019; 12:7. [PMID: 30611310 PMCID: PMC6321724 DOI: 10.1186/s13071-018-3270-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Accepted: 12/13/2018] [Indexed: 01/05/2023] Open
Abstract
Background Rhipicephalus microplus is an efficient biological vector of Babesia bovis, a causative agent of bovine babesiosis. Babesia bovis is passed transovarially to the next generation of ticks, which then transmit the parasite to naïve animals. Due to the importance of the R. microplus ovary for tick reproduction and transmission of B. bovis, we investigated the hypothesis that silencing vitellogenin receptor gene expression in the ovary during tick feeding on B. bovis-infected cattle would affect parasite transmission to the next generation of ticks. Results Silencing expression of the vitellogenin receptor in the ovary by RNA interference, resulted in reduced tick fertility. We observed reduced egg production (i.e. reduced weight of eggs), a lower rate of embryonic development, and a reduction in hatching. Analysis of individual larvae by PCR confirmed that RNAi mediated downregulation of the R. microplus vitellogenin receptor and also interfered with transovarial transmission of B. bovis. None of the larvae (0/58) from the RmVgR dsRNA-injected group were PCR-positive, whereas 12% (7/58) and 17% (10/58) of larvae from the non-injected and buffer-injected control groups, respectively, were infected with B. bovis. Conclusions The combined effects of reduced fecundity and reduced infection in surviving larvae resulting from silencing indicate that vitellogenin receptor is essential for tick reproduction and may play a vital role in B. bovis transmission.
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Affiliation(s)
- Hala E Hussein
- Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA, 99164, USA. .,Department of Entomology, Faculty of Science, Cairo University, Giza, 12613, Egypt.
| | - Wendell C Johnson
- Animal Disease Research Unit, USDA-ARS, Washington State University, 3003 ADBF, P.O. Box 646630, Pullman, WA, 99164, USA
| | - Naomi S Taus
- Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA, 99164, USA.,Animal Disease Research Unit, USDA-ARS, Washington State University, 3003 ADBF, P.O. Box 646630, Pullman, WA, 99164, USA
| | - Carlos E Suarez
- Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA, 99164, USA.,Animal Disease Research Unit, USDA-ARS, Washington State University, 3003 ADBF, P.O. Box 646630, Pullman, WA, 99164, USA
| | - Glen A Scoles
- Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA, 99164, USA.,Animal Disease Research Unit, USDA-ARS, Washington State University, 3003 ADBF, P.O. Box 646630, Pullman, WA, 99164, USA
| | - Massaro W Ueti
- Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA, 99164, USA.,Animal Disease Research Unit, USDA-ARS, Washington State University, 3003 ADBF, P.O. Box 646630, Pullman, WA, 99164, USA
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10
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Pitombeira de Figueirêdo L, Daam MA, Mainardi G, Mariën J, Espíndola ELG, van Gestel CAM, Roelofs D. The use of gene expression to unravel the single and mixture toxicity of abamectin and difenoconazole on survival and reproduction of the springtail Folsomia candida. Environ Pollut 2019; 244:342-350. [PMID: 30352348 DOI: 10.1016/j.envpol.2018.10.077] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Revised: 10/09/2018] [Accepted: 10/16/2018] [Indexed: 06/08/2023]
Abstract
Pesticides risk assessments have traditionally focused on the effects on standard parameters, such as mortality, reproduction and development. However, one of the first signs of adverse effects that occur in organisms exposed to stress conditions is an alteration in their genomic expression, which is specific to the type of stress, sensitive to very low contaminant concentrations and responsive in a few hours. The aim of the present study was to evaluate the single and binary mixture toxicity of commercial products of abamectin (Kraft® 36 EC) and difenoconazole (Score® 250 EC) to Folsomia candida. Laboratory toxicity tests were conducted to access the effects of these pesticides on springtail survival, reproduction and gene expression. The reproduction assays gave EC50 and EC10 values, respectively, of 6.3 and 1.4 mg a.s./kg dry soil for abamectin; 1.0 and 0.12 mg a.s./kg dry soil for Kraft® 36 EC; and 54 and 23 mg a.s./kg dry soil for Score® 250 EC. Technical difenoconazole did not have any effect at the concentrations tested. No significant differences in gene expression were found between the abamectin concentrations tested (EC10 and EC50) and the solvent control. Exposure to Kraft® 36 EC, however, significantly induced Cyp6 expression at the EC50 level, while VgR was significantly downregulated at both the EC10 and EC50. Exposure to the simple pesticide mixture of Kraft® 36 EC + Score® 250 EC caused significant up regulation of ABC transporter, and significant down regulation of VgR relative to the controls. GABA receptor also showed significant down-regulation between the EC10 and EC50 mixture treatments. Results of the present study demonstrate that pesticide-induced gene expression effects precede and occur at lower concentrations than organism-level responses. Integrating "omic" endpoints in traditional bioassays may thus be a promising way forward in pesticide toxicity evaluations.
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Affiliation(s)
- Livia Pitombeira de Figueirêdo
- NEEA/CRHEA/SHS, São Carlos Engineering School, University of São Paulo, Av. Trabalhador São Carlense, 400, 13.560-970, São Carlos, Brazil; Department of Ecological Science, Faculty of Science, Vrije Universiteit, De Boelelaan 1085, 1081, HV Amsterdam, the Netherlands.
| | - Michiel A Daam
- CENSE, Department of Environmental Sciences and Engineering, Faculty of Sciences and Technology, New University of Lisbon, Quinta da Torre, 2829-516, Caparica, Portugal
| | - Giulia Mainardi
- Department of Ecological Science, Faculty of Science, Vrije Universiteit, De Boelelaan 1085, 1081, HV Amsterdam, the Netherlands
| | - Janine Mariën
- Department of Ecological Science, Faculty of Science, Vrije Universiteit, De Boelelaan 1085, 1081, HV Amsterdam, the Netherlands
| | - Evaldo L G Espíndola
- NEEA/CRHEA/SHS, São Carlos Engineering School, University of São Paulo, Av. Trabalhador São Carlense, 400, 13.560-970, São Carlos, Brazil
| | - Cornelis A M van Gestel
- Department of Ecological Science, Faculty of Science, Vrije Universiteit, De Boelelaan 1085, 1081, HV Amsterdam, the Netherlands
| | - Dick Roelofs
- Department of Ecological Science, Faculty of Science, Vrije Universiteit, De Boelelaan 1085, 1081, HV Amsterdam, the Netherlands
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11
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Li XR, Li Y, Wang W, He N, Tan XL, Yang XQ. LC 50 of lambda-cyhalothrin stimulates reproduction on the moth Mythimna separata (Walker). Pestic Biochem Physiol 2019; 153:47-54. [PMID: 30744896 DOI: 10.1016/j.pestbp.2018.11.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Revised: 10/11/2018] [Accepted: 11/01/2018] [Indexed: 06/09/2023]
Abstract
Lambda-cyhalothrin has long been recommended as an effective insecticide to control the oriental armyworm, Mythimna separata (Walker), a notorious migratory pest of agricultural plants. Previous researches have suggested that survival, development, and reproduction of insects are influenced by sublethal concentrations of insecticides. However, the effects of sublethal concentrations of lambda-cyhalothrin on M. separata are less known. In this study, we determined the toxicity and effects of LC20 and LC50 concentration of lambda-cyhalothrin on development and reproduction of M. separata. Results indicate that LC20 of lambda-cyhalothrin tends to decrease the life traits of M. separate, with a shortening larvae period of offspring and oviposition period, whereas LC50 of lambda-cyhalothrin stimulates daily maximal fecundity and forwards the oviposition peak, suggesting a stimulation of reproduction by LC50 of lambda-cyhalothrin. The M. separata population was increased by an LC50 concentration of lambda-cyhalothrin, resulting in a net reproductive rate (R0) and intrinsic rate of increase (rm) significantly higher than that of the control. Transcripts of vitellogenin (MsVg) and vitellogenin receptor (MsVgR) genes were suppressed at day 1 after emergence of moth which developed from the larvae exposed to LC20 and LC50 of lambda-cyhalothrin, but were significant induced when the moth begin to lay eggs (day 4), with a more remarkable induction by LC50 of lambda-cyhalothrin than those of LC20 of lambda-cyhalothrin. Our results indicate that the observed stimulation of reproduction is therefore the results of up-regulation of MsVg and MsVgR by LC50 of lambda-cyhalothrin.
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Affiliation(s)
- Xin-Ru Li
- Key Laboratory of Economic and Applied Entomology of Liaoning Province, College of Plant Protection, Shenyang Agricultural University, Shenyang 110866, China
| | - Yue Li
- Key Laboratory of Economic and Applied Entomology of Liaoning Province, College of Plant Protection, Shenyang Agricultural University, Shenyang 110866, China
| | - Wei Wang
- Key Laboratory of Economic and Applied Entomology of Liaoning Province, College of Plant Protection, Shenyang Agricultural University, Shenyang 110866, China
| | - Ning He
- Key Laboratory of Economic and Applied Entomology of Liaoning Province, College of Plant Protection, Shenyang Agricultural University, Shenyang 110866, China
| | - Xiao-Ling Tan
- Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China.
| | - Xue-Qing Yang
- Key Laboratory of Economic and Applied Entomology of Liaoning Province, College of Plant Protection, Shenyang Agricultural University, Shenyang 110866, China.
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12
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Mizuta H, Mushirobira Y, Nagata J, Todo T, Hara A, Reading BJ, Sullivan CV, Hiramatsu N. Ovarian expression and localization of clathrin (Cltc) components in cutthroat trout, Oncorhynchus clarki: Evidence for Cltc involvement in endocytosis of vitellogenin during oocyte growth. Comp Biochem Physiol A Mol Integr Physiol 2017; 212:24-34. [PMID: 28687414 DOI: 10.1016/j.cbpa.2017.06.021] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2017] [Revised: 06/28/2017] [Accepted: 06/28/2017] [Indexed: 11/24/2022]
Abstract
To evaluate potential involvement of clathrin in endocytosis of vitellogenin (Vtg) by teleost oocytes, cDNAs encoding clathrin heavy chain (cltc) were cloned from ovaries of cutthroat trout. Quantitative PCR revealed three types of cltc (cltc-a1, cltc-a2, cltc-b) to be expressed in 10 different tissues including the ovary. The cltc-a1 alone exhibited a significant decrease in ovarian expression during vitellogenesis; this was correlated with a corresponding decrease in transcripts encoding the major Vtg receptor (Vtgr). No development-related changes in ovarian cltc-a2 or cltc-b transcript levels were observed. In situ hybridization revealed a strong ctlc signal in pre-vitellogenic oocytes, but not in vitellogenic oocytes. Western blotting using a rabbit antiserum (a-Cltc) raised against a recombinant Cltc preparation detected a polypeptide band with an apparent mass of ~170kDa in vitellogenic ovary extracts. Immunohistochemistry using a-Cltc revealed Cltc to be uniformly distributed throughout the ooplasm of perinucleolus stage oocytes, translocated to the periphery of lipid droplet stage oocytes, and localized to the oolemma during vitellogenesis. These patterns of cltc/Cltc distribution and abundance during oogenesis, which are identical to those previously reported for vtgr/Vtgr in this species, constitute the first empirical evidence that cltc-a1/Cltc-a1 is involved in Vtg endocytosis via the Vtgr in teleost fish.
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13
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Liu X, Shen G, Xu H, He L. The fenpropathrin resistant Tetranychus cinnabarinus showed increased fecundity with high content of vitellogenin and vitellogenin receptor. Pestic Biochem Physiol 2016; 134:31-38. [PMID: 27914537 DOI: 10.1016/j.pestbp.2016.04.010] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Revised: 04/28/2016] [Accepted: 04/29/2016] [Indexed: 06/06/2023]
Abstract
Carmine spider mite, Tetranychus cinnabarinus (Boisduval), an agricultural pest of economically important crops, has developed resistance to a group of pesticides. We have selected a fenpropathrin-resistant strain (FeR) of T. cinnabarinus from the isogenous and susceptible strain (SS), and found that the FeR not only showed resistance but its fecundity also increased. According to the numbers of eggs laid per day of both strains, the FeR was more fertile than SS throughout the life span. To investigate the underlying reason, the protein contents of vitellogenin (vg) and vitellogenin receptor (vgr) were detected, and the results showed both of them were significantly higher in FeR than in SS. Then, the mRNA-expressions of vg and vgr genes were compared between FeR and SS. From the transcriptome data of T. cinnabarinus, we classified two vg genes (designated as Tcvg1 and Tcvg2, respectively) and a vgr gene (designated as Tcvgr). The expressions of Tcvg1, Tcvg2 and Tcvgr were highly associated with the fecundity of the mites that their mRNAs were extremely abundant at the adult stage, but hardly detectable during the developmental period (from egg to deutonymph). In accordance with the protein content, the expression levels of the three genes were all significantly higher in FeR than they were in SS. These results suggested that after resistance selection with fenpropathrin in T. cinnabarinus, the fecundity and the expression of reproduction-related genes (vg and vgr) were significantly higher in fenpropathrin resistant strain than that in susceptible strain.
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Affiliation(s)
- Xing Liu
- Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing, China
| | - Guangmao Shen
- Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing, China
| | - Haoran Xu
- Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing, China
| | - Lin He
- Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing, China.
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14
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Lafontaine A, Hanikenne M, Boulangé-Lecomte C, Forget-Leray J, Thomé JP, Gismondi E. Vitellogenin and vitellogenin receptor gene expression and 20-hydroxyecdysone concentration in Macrobrachium rosenbergii exposed to chlordecone. Environ Sci Pollut Res Int 2016; 23:20661-20671. [PMID: 27470247 DOI: 10.1007/s11356-016-7273-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Accepted: 07/15/2016] [Indexed: 06/06/2023]
Abstract
Chlordecone is a persistent organochlorine pesticide widely used in Guadeloupe (French West Indies) to control the banana weevil Cosmopolites sordidus. Although it was previously highlighted that chlordecone may affect the reproduction and growth of vertebrate species, little information is available on the chlordecone effects in invertebrates. The present study investigated the effects of chlordecone on a hormone and a protein having key roles in reproduction and growth of the decapod crustacean Macrobrachium rosenbergii, by measuring the 20-hydroxyecdysone concentration, vitellogenin, and vitellogenin receptor gene expression, as well as the bioconcentration of chlordecone in exposed prawns. First, the results revealed that chlordecone was accumulated in M. rosenbergii. Then, it was found that Vg and VgR gene expression were increased in male and female M. rosenbergii exposed to chlordecone for 90 and 240 days, while the 20-hydroxyecdysone concentrations were decreased. This work suggests that chlordecone accumulates in prawn tissues and could affect key molecules involved in the reproduction and the growth of the invertebrate M. rosenbergii. However, many questions remain unresolved regarding the impacts of chlordecone on growth and reproduction and the signaling pathways responsible for these effects, as well as the potential role of confounding factors present in in situ studies.
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Affiliation(s)
- Anne Lafontaine
- Laboratory of Animal Ecology and Ecotoxicology (LEAE), Centre of Analytical Research and Technology (CART), University of Liège, 15 Allée du Six Aout, 4000, Liège, Belgium.
| | - Marc Hanikenne
- Center for Protein Engineering, Functional Genomics and Plant Molecular Imaging, University of Liège, 27 Boulevard du Rectorat, 4000, Liège, Belgium
- PhytoSYSTEMS, University of Liège, 27 Boulevard du Rectorat, 4000, Liège, Belgium
| | - Céline Boulangé-Lecomte
- Normandie University, ULH, UMR I-02 SEBIO, FR CNRS 3730 SCALE, 25 rue Philippe Lebon, 76058, Le Havre, France
| | - Joëlle Forget-Leray
- Normandie University, ULH, UMR I-02 SEBIO, FR CNRS 3730 SCALE, 25 rue Philippe Lebon, 76058, Le Havre, France
| | - Jean-Pierre Thomé
- Laboratory of Animal Ecology and Ecotoxicology (LEAE), Centre of Analytical Research and Technology (CART), University of Liège, 15 Allée du Six Aout, 4000, Liège, Belgium
| | - Eric Gismondi
- Laboratory of Animal Ecology and Ecotoxicology (LEAE), Centre of Analytical Research and Technology (CART), University of Liège, 15 Allée du Six Aout, 4000, Liège, Belgium
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15
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Bai H, Qiao H, Li F, Fu H, Jiang S, Zhang W, Yan Y, Xiong Y, Sun S, Jin S, Gong Y, Wu Y. Molecular and functional characterization of the vitellogenin receptor in oriental river prawn, Macrobrachium nipponense. Comp Biochem Physiol A Mol Integr Physiol 2016; 194:45-55. [PMID: 26773480 DOI: 10.1016/j.cbpa.2015.12.008] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Revised: 07/20/2015] [Accepted: 12/30/2015] [Indexed: 11/24/2022]
Abstract
A complementary DNA (cDNA) that encodes the vitellogenin receptor (VgR) in the oriental river prawn, Macrobrachium nipponense, was cloned using expressed sequence tag analysis and a rapid amplification of cDNA ends approach. The coding region consists of 5920 base pairs (bp) that encode a 1902 amino acid protein, with a predicted molecular mass of 209 kDa. The coding region is flanked by a 45 bp 5'-untranslated region (UTR) and a 166 bp 3'-UTR. The deduced amino acid sequence of the M. nipponense VgR cDNA had typically conserved domains, such as an extracellular, lipoprotein-binding domain, epidermal growth factor-like and O-glycosylation domains, a transmembrane domain and a short C-terminal, cytosolic tail. Quantitative real-time PCR (qPCR) indicated that Mn-VgR is highly expressed in the female ovary. Expression analysis by qPCR demonstrated the larval and ovarian developmental stage-specific expression pattern. As the ovaries developed, the expression level of Mn-VgR gradually increased during the reproductive cycle (stage I), to reach a peak in stage III. Levels then dropped as a new development cycle was entered after reproduction molting. Eyestalk ablation led to a significant increase in the expression of Mn-VgR during the ovarian development stages (P<0.05), when compared with the eyestalk-intact group. The investigation revealed that eyestalk ablation initially affected Mn-VgR expression and then influenced vitellogenesis. In adult females, VgR RNA interference (RNAi) dramatically delayed the maturation of the ovary, in accordance with the gonad somatic index. In addition, Mn-VgR RNAi led to vitellin depletion in the oocytes and the accumulation of vitellin in the hepatopancreas.
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Affiliation(s)
- Hongkun Bai
- Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, China
| | - Hui Qiao
- Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China
| | - Fajun Li
- Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, China; Weifang University of Science and Technology, Shouguang 262700, China
| | - Hongtuo Fu
- Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, China; Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China.
| | - Sufei Jiang
- Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China
| | - Wenyi Zhang
- Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China
| | - Yuedi Yan
- Shanghai Ocean University, Shanghai 201306, China
| | - Yiwei Xiong
- Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China
| | - Shengming Sun
- Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China
| | - Shubo Jin
- Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, China; Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China
| | - Yongsheng Gong
- Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China
| | - Yan Wu
- Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China
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16
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Lu K, Shu Y, Zhou J, Zhang X, Zhang X, Chen M, Yao Q, Zhou Q, Zhang W. Molecular characterization and RNA interference analysis of vitellogenin receptor from Nilaparvata lugens (Stål). J Insect Physiol 2015; 73:20-9. [PMID: 25617689 DOI: 10.1016/j.jinsphys.2015.01.007] [Citation(s) in RCA: 113] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Revised: 01/08/2015] [Accepted: 01/12/2015] [Indexed: 05/13/2023]
Abstract
Vitellogenin receptors (VgRs), members of the low-density lipoprotein receptor (LDLR) superfamily, are responsible for taking vitellogenin (Vg) into developing oocytes. Here the first full-length VgR cDNA from a hemipteran insect, the brown planthopper (Nilaparvata lugens), was cloned and sequenced. The complete mRNA sequence was 6174 bp in length with an open reading frame (ORF) of 5796 bp encoding 1931 amino acid residues. N. lugens VgR (NlVgR) contained two ligand-binding domains with five LDLR Class A cysteine-rich repeats in the first domain and eight in the second domain, which was similar to other insect VgRs. NlVgR was specifically expressed in the ovary, and the mRNA level started to increase after adult female emergence, with a peak on day 7 in the adult stage, and then declined. Western blot analysis of NlVgR protein revealed an ovary-specific expression pattern, which was consistent with NlVgR transcript detection. Injection with NlVgR double-stranded RNA (dsRNA) significantly disturbed NlVgR, which led to a decrease in NlVg protein content in the ovaries, an accumulation of NlVg protein in the hemolymph, the arrested development of ovaries, and the failure of insects to reproduce. Besides, NlVgR expression was significantly upregulated after the topical application of juvenile hormone (JH) III. These results suggest that VgR is critical for Vg uptaking of oocytes and it plays an important role in insect fecundity.
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Affiliation(s)
- Kai Lu
- State Key Laboratory of Biocontrol and Institute of Entomology, Sun-Yat-sen University, Guangzhou 510275, China; College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Yinghua Shu
- State Key Laboratory of Biocontrol and Institute of Entomology, Sun-Yat-sen University, Guangzhou 510275, China
| | - Jialiang Zhou
- State Key Laboratory of Biocontrol and Institute of Entomology, Sun-Yat-sen University, Guangzhou 510275, China
| | - Xiaoyi Zhang
- State Key Laboratory of Biocontrol and Institute of Entomology, Sun-Yat-sen University, Guangzhou 510275, China
| | - Xinyu Zhang
- State Key Laboratory of Biocontrol and Institute of Entomology, Sun-Yat-sen University, Guangzhou 510275, China
| | - Mingxiao Chen
- State Key Laboratory of Biocontrol and Institute of Entomology, Sun-Yat-sen University, Guangzhou 510275, China
| | - Qiong Yao
- State Key Laboratory of Biocontrol and Institute of Entomology, Sun-Yat-sen University, Guangzhou 510275, China
| | - Qiang Zhou
- State Key Laboratory of Biocontrol and Institute of Entomology, Sun-Yat-sen University, Guangzhou 510275, China.
| | - Wenqing Zhang
- State Key Laboratory of Biocontrol and Institute of Entomology, Sun-Yat-sen University, Guangzhou 510275, China
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Smith AD, Reuben Kaufman W. Molecular characterization of the vitellogenin receptor from the tick, Amblyomma hebraeum (Acari: Ixodidae). Insect Biochem Mol Biol 2013; 43:1133-1141. [PMID: 24128609 DOI: 10.1016/j.ibmb.2013.10.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2013] [Revised: 10/01/2013] [Accepted: 10/04/2013] [Indexed: 06/02/2023]
Abstract
We have identified the full-length cDNA encoding a vitellogenin receptor (VgR) from the African bont tick Amblyomma hebraeum Koch (1844). VgRs are members of the low-density lipoprotein receptor superfamily that promote the uptake of the yolk protein vitellogenin (Vg), from the haemolymph. The AhVgR (GenBank accession No. JX846592) is 5703 bp, and encodes an 1801 aa protein with a 196.5 kDa molecular mass following cleavage of a 22 aa signal peptide. Phylogenetic analysis indicates that AhVgR is highly similar to other tick VgRs. AhVgR is expressed in only the ovary of mated, engorged females, and is absent in all other female tissues and in both fed and unfed males. Unfed, adult females injected with a VgR-dsRNA probe to knock-down VgR expression experienced a significant delay in ovary development and started oviposition significantly later than controls. These results indicate that the expression of AhVgR is important for the uptake of Vg and subsequent maturation of the oocytes.
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Affiliation(s)
- Alexander D Smith
- Department of Biological Sciences, University of Alberta, CW 405, Biological Sciences Building, Edmonton, Alberta T6G 2E9, Canada.
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Mizuta H, Luo W, Ito Y, Mushirobira Y, Todo T, Hara A, Reading BJ, Sullivan CV, Hiramatsu N. Ovarian expression and localization of a vitellogenin receptor with eight ligand binding repeats in the cutthroat trout (Oncorhynchus clarki). Comp Biochem Physiol B Biochem Mol Biol 2013; 166:81-90. [PMID: 23872140 DOI: 10.1016/j.cbpb.2013.07.005] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2013] [Revised: 07/12/2013] [Accepted: 07/12/2013] [Indexed: 10/26/2022]
Abstract
A cDNA encoding a vitellogenin receptor with 8 ligand binding repeats (vtgr) was cloned from ovaries of the cutthroat trout, Oncorhynchus clarki. In situ hybridization and quantitative PCR analyses revealed that the main site of vtgr mRNA expression was the oocytes. Expression was strongly detected in perinucleous stage oocytes, gradually decreased as oocytes grew, and became hardly detectable in vitellogenic oocytes. A rabbit antibody (a-Vtgr) was raised against a recombinant Vtgr protein in order to immunologically detect and localize Vtgr within the ovarian follicles. Western blotting using a-Vtgr detected a bold band with an apparent mass of ~95-105kDa in an ovarian preparation that also bound Sakhalin taimen, Hucho perryi, vitellogenin in ligand blots. Immunohistochemistry using a-Vtgr revealed that the Vtgr was uniformly distributed throughout the ooplasm of perinucleolus stage oocytes, subsequently translocated to the periphery of lipid droplet stage oocytes, and became localized to the oolemma during vitellogenesis. We provide the first characterization of Vtgr at both the transcriptional and the translational levels in the cutthroat trout, and our results suggest that this receptor is involved in uptake of Vtg by oocytes of this species.
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Affiliation(s)
- Hiroko Mizuta
- Division of Marine Life Science, Graduate School of Fisheries Sciences, Hokkaido University, 3-1-1 Minato, Hakodate, Hokkaido, 041-8611, Japan
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