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Mellentine SQ, Brown HN, Ramsey AS, Li J, Tootle TL. Specific prostaglandins are produced in the migratory cells and the surrounding substrate to promote Drosophila border cell migration. Front Cell Dev Biol 2024; 11:1257751. [PMID: 38283991 PMCID: PMC10811798 DOI: 10.3389/fcell.2023.1257751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Accepted: 12/27/2023] [Indexed: 01/30/2024] Open
Abstract
Introduction: A key regulator of collective cell migration is prostaglandin (PG) signaling. However, it remains largely unclear whether PGs act within the migratory cells or their microenvironment to promote migration. Here we use Drosophila border cell migration as a model to uncover the cell-specific roles of two PGs in collective migration. The border cells undergo a collective and invasive migration between the nurse cells; thus, the nurse cells are the substrate and microenvironment for the border cells. Prior work found PG signaling is required for on-time border cell migration and cluster cohesion. Methods: Confocal microscopy and quantitative image analyses of available mutant alleles and RNAi lines were used to define the roles of the PGE2 and PGF2α synthases in border cell migration. Results: We find that the PGE2 synthase cPGES is required in the substrate, while the PGF2α synthase Akr1B is required in the border cells for on-time migration. Akr1B acts in both the border cells and their substrate to regulate cluster cohesion. One means by which Akr1B may regulate border cell migration and/or cluster cohesion is by promoting integrin-based adhesions. Additionally, Akr1B limits myosin activity, and thereby cellular stiffness, in the border cells, whereas cPGES limits myosin activity in both the border cells and their substrate. Decreasing myosin activity overcomes the migration delays in both akr1B and cPGES mutants, indicating the changes in cellular stiffness contribute to the migration defects. Discussion: Together these data reveal that two PGs, PGE2 and PGF2α, produced in different locations, play key roles in promoting border cell migration. These PGs likely have similar migratory versus microenvironment roles in other collective cell migrations.
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Affiliation(s)
- Samuel Q. Mellentine
- Anatomy and Cell Biology, University of Iowa Carver College of Medicine, Iowa City, IA, United States
- Biology, University of Iowa, Iowa City, IA, United States
| | - Hunter N. Brown
- Anatomy and Cell Biology, University of Iowa Carver College of Medicine, Iowa City, IA, United States
- Biology, University of Iowa, Iowa City, IA, United States
| | - Anna S. Ramsey
- Anatomy and Cell Biology, University of Iowa Carver College of Medicine, Iowa City, IA, United States
- Biology, University of Iowa, Iowa City, IA, United States
| | - Jie Li
- Anatomy and Cell Biology, University of Iowa Carver College of Medicine, Iowa City, IA, United States
- Biology, University of Iowa, Iowa City, IA, United States
| | - Tina L. Tootle
- Anatomy and Cell Biology, University of Iowa Carver College of Medicine, Iowa City, IA, United States
- Biology, University of Iowa, Iowa City, IA, United States
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Chen Y, Chen Y, Jian B, Feng Q, Liu L. Identification and Expression of Integrins during Testicular Fusion in Spodoptera litura. Genes (Basel) 2023; 14:1452. [PMID: 37510356 PMCID: PMC10379305 DOI: 10.3390/genes14071452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Revised: 07/10/2023] [Accepted: 07/13/2023] [Indexed: 07/30/2023] Open
Abstract
Integrin members are cell adhesion receptors that bind to extracellular matrix (ECM) proteins to regulate cell-cell adhesion and cell-ECM adhesion. This process is essential for tissue development and organogenesis. The fusion of two testes is a physiological phenomenon that is required for sperm production and effective reproduction in many Lepidoptera. However, the molecular mechanism of testicular fusion is unclear. In Spodoptera litura, two separated testes fuse into a single testis during the larva-to-pupa transformation. We identified five α and five β integrin subunits that were closely associated with testicular fusion. Integrin α1 and α2 belong to the position-specific 1 (PS1) and PS2 groups, respectively. Integrin α3, αPS1/αPS2, and αPS3 were clustered into the PS3 group. Integrin β1 belonged to the insect β group, and β2, β3, and β5 were clustered in the βν group. Among these integrins, α1, α2, α3, αPS1/PS2, αPS3, β1, and β4 subunits were highly expressed when the testes fused. However, their expression levels were much lower before and after the fusion of the testis. The qRT-PCR and immunohistochemistry analyses indicated that integrin β1 mRNA and the protein were highly expressed in the peritoneal sheath of the testis, particularly when the testes fused. These results indicate that integrins might participate in S. litura testicular fusion.
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Affiliation(s)
- Yaqing Chen
- Guangdong Provincial Key Laboratory of Insect Developmental Biology and Applied Technology, Institute of Insect Science and Technology, School of Life Sciences, South China Normal University, Guangzhou 510631, China
- 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
| | - Yu Chen
- Guangdong Provincial Key Laboratory of Insect Developmental Biology and Applied Technology, Institute of Insect Science and Technology, School of Life Sciences, South China Normal University, Guangzhou 510631, China
- 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
| | - Baozhu Jian
- Guangdong Provincial Key Laboratory of Insect Developmental Biology and Applied Technology, Institute of Insect Science and Technology, School of Life Sciences, South China Normal University, Guangzhou 510631, China
- 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
| | - Qili Feng
- Guangdong Provincial Key Laboratory of Insect Developmental Biology and Applied Technology, Institute of Insect Science and Technology, School of Life Sciences, South China Normal University, Guangzhou 510631, China
- 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
| | - Lin Liu
- Guangdong Provincial Key Laboratory of Insect Developmental Biology and Applied Technology, Institute of Insect Science and Technology, School of Life Sciences, South China Normal University, Guangzhou 510631, China
- 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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Mellentine SQ, Ramsey AS, Li J, Brown HN, Tootle TL. Specific prostaglandins are produced in the migratory cells and the surrounding substrate to promote Drosophila border cell migration. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.06.23.546291. [PMID: 37425965 PMCID: PMC10327004 DOI: 10.1101/2023.06.23.546291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/11/2023]
Abstract
A key regulator of collective cell migration is prostaglandin (PG) signaling. However, it remains largely unclear whether PGs act within the migratory cells or their microenvironment to promote migration. Here we use Drosophila border cell migration as a model to uncover the cell-specific roles of two PGs in collective migration. Prior work shows PG signaling is required for on-time migration and cluster cohesion. We find that the PGE2 synthase cPGES is required in the substrate, while the PGF2α synthase Akr1B is required in the border cells for on-time migration. Akr1B acts in both the border cells and their substrate to regulate cluster cohesion. One means by which Akr1B regulates border cell migration is by promoting integrin-based adhesions. Additionally, Akr1B limits myosin activity, and thereby cellular stiffness, in the border cells, whereas cPGES limits myosin activity in both the border cells and their substrate. Together these data reveal that two PGs, PGE2 and PGF2α, produced in different locations, play key roles in promoting border cell migration. These PGs likely have similar migratory versus microenvironment roles in other collective cell migrations.
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Affiliation(s)
- Samuel Q. Mellentine
- Anatomy and Cell Biology, University of Iowa Carver College of Medicine, Iowa City, IA 52242
| | - Anna S. Ramsey
- Anatomy and Cell Biology, University of Iowa Carver College of Medicine, Iowa City, IA 52242
| | - Jie Li
- Anatomy and Cell Biology, University of Iowa Carver College of Medicine, Iowa City, IA 52242
| | - Hunter N. Brown
- Anatomy and Cell Biology, University of Iowa Carver College of Medicine, Iowa City, IA 52242
| | - Tina L. Tootle
- Anatomy and Cell Biology, University of Iowa Carver College of Medicine, Iowa City, IA 52242
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Zhao AJ, Montes-Laing J, Perry WMG, Shiratori M, Merfeld E, Rogers SL, Applewhite DA. The Drosophila spectraplakin Short stop regulates focal adhesion dynamics by crosslinking microtubules and actin. Mol Biol Cell 2022; 33:ar19. [PMID: 35235367 PMCID: PMC9282009 DOI: 10.1091/mbc.e21-09-0434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
The spectraplakin family of proteins includes ACF7/MACF1 and BPAG1/dystonin in mammals, VAB-10 in Caenorhabditis elegans, Magellan in zebrafish, and Short stop (Shot), the sole Drosophila member. Spectraplakins are giant cytoskeletal proteins that cross-link actin, microtubules, and intermediate filaments, coordinating the activity of the entire cytoskeleton. We examined the role of Shot during cell migration using two systems: the in vitro migration of Drosophila tissue culture cells and in vivo through border cell migration. RNA interference (RNAi) depletion of Shot increases the rate of random cell migration in Drosophila tissue culture cells as well as the rate of wound closure during scratch-wound assays. This increase in cell migration prompted us to analyze focal adhesion dynamics. We found that the rates of focal adhesion assembly and disassembly were faster in Shot-depleted cells, leading to faster adhesion turnover that could underlie the increased migration speeds. This regulation of focal adhesion dynamics may be dependent on Shot being in an open confirmation. Using Drosophila border cells as an in vivo model for cell migration, we found that RNAi depletion led to precocious border cell migration. Collectively, these results suggest that spectraplakins not only function to cross-link the cytoskeleton but may regulate cell–matrix adhesion.
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Affiliation(s)
- Andrew J Zhao
- Department of Biology, Reed College, 3203 SE Woodstock Boulevard, Portland, OR 97202, USA
| | - Julia Montes-Laing
- Department of Biology, Reed College, 3203 SE Woodstock Boulevard, Portland, OR 97202, USA
| | - Wick M G Perry
- Department of Biology, Reed College, 3203 SE Woodstock Boulevard, Portland, OR 97202, USA
| | - Mari Shiratori
- Department of Biology, Reed College, 3203 SE Woodstock Boulevard, Portland, OR 97202, USA
| | - Emily Merfeld
- Department of Biology, Reed College, 3203 SE Woodstock Boulevard, Portland, OR 97202, USA
| | - Stephen L Rogers
- Department of Biology & Carolina Center for Genome Sciences, The University of North Carolina at Chapel Hill, Campus Box 3280, 422 Fordham Hall, Chapel Hill, NC 27599-3280, USA
| | - Derek A Applewhite
- Department of Biology, Reed College, 3203 SE Woodstock Boulevard, Portland, OR 97202, USA
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Lamb MC, Kaluarachchi CP, Lansakara TI, Mellentine SQ, Lan Y, Tivanski AV, Tootle TL. Fascin limits Myosin activity within Drosophila border cells to control substrate stiffness and promote migration. eLife 2021; 10:69836. [PMID: 34698017 PMCID: PMC8547955 DOI: 10.7554/elife.69836] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Accepted: 10/11/2021] [Indexed: 12/24/2022] Open
Abstract
A key regulator of collective cell migrations, which drive development and cancer metastasis, is substrate stiffness. Increased substrate stiffness promotes migration and is controlled by Myosin. Using Drosophila border cell migration as a model of collective cell migration, we identify, for the first time, that the actin bundling protein Fascin limits Myosin activity in vivo. Loss of Fascin results in: increased activated Myosin on the border cells and their substrate, the nurse cells; decreased border cell Myosin dynamics; and increased nurse cell stiffness as measured by atomic force microscopy. Reducing Myosin restores on-time border cell migration in fascin mutant follicles. Further, Fascin’s actin bundling activity is required to limit Myosin activation. Surprisingly, we find that Fascin regulates Myosin activity in the border cells to control nurse cell stiffness to promote migration. Thus, these data shift the paradigm from a substrate stiffness-centric model of regulating migration, to uncover that collectively migrating cells play a critical role in controlling the mechanical properties of their substrate in order to promote their own migration. This understudied means of mechanical regulation of migration is likely conserved across contexts and organisms, as Fascin and Myosin are common regulators of cell migration.
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Affiliation(s)
- Maureen C Lamb
- Anatomy and Cell Biology, University of Iowa Carver College of Medicine, Iowa City, United States
| | | | | | - Samuel Q Mellentine
- Anatomy and Cell Biology, University of Iowa Carver College of Medicine, Iowa City, United States
| | - Yiling Lan
- Department of Chemistry, University of Iowa, Iowa City, United States
| | - Alexei V Tivanski
- Department of Chemistry, University of Iowa, Iowa City, United States
| | - Tina L Tootle
- Anatomy and Cell Biology, University of Iowa Carver College of Medicine, Iowa City, United States
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Huang YC, Chen KH, Chen YY, Tsao LH, Yeh TH, Chen YC, Wu PY, Wang TW, Yu JY. βPS-Integrin acts downstream of Innexin 2 in modulating stretched cell morphogenesis in the Drosophila ovary. G3-GENES GENOMES GENETICS 2021; 11:6310741. [PMID: 34544125 PMCID: PMC8496311 DOI: 10.1093/g3journal/jkab215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Accepted: 06/14/2021] [Indexed: 11/25/2022]
Abstract
During oogenesis, a group of specialized follicle cells, known as stretched cells (StCs), flatten drastically from cuboidal to squamous shape. While morphogenesis of epithelia is critical for organogenesis, genes and signaling pathways involved in this process remain to be revealed. In addition to formation of gap junctions for intercellular exchange of small molecules, gap junction proteins form channels or act as adaptor proteins to regulate various cellular behaviors. In invertebrates, gap junction proteins are Innexins. Knockdown of Innexin 2 but not other Innexins expressed in follicle cells attenuates StC morphogenesis. Interestingly, blocking of gap junctions with an inhibitor carbenoxolone does not affect StC morphogenesis, suggesting that Innexin 2 might control StCs flattening in a gap-junction-independent manner. An excessive level of βPS-Integrin encoded by myospheroid is detected in Innexin 2 mutant cells specifically during StC morphogenesis. Simultaneous knockdown of Innexin 2 and myospheroid partially rescues the morphogenetic defect resulted from Innexin 2 knockdown. Furthermore, reduction of βPS-Integrin is sufficient to induce early StCs flattening. Taken together, our data suggest that βPS-Integrin acts downstream of Innexin 2 in modulating StCs morphogenesis.
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Affiliation(s)
- Yi-Chia Huang
- Department of Life Sciences and Institute of Genome Sciences, National Yang Ming Chiao Tung University, Taipei 112, Taiwan
| | - Kuan-Han Chen
- Department of Life Sciences and Institute of Genome Sciences, National Yang Ming Chiao Tung University, Taipei 112, Taiwan
| | - Yu-Yang Chen
- Department of Life Sciences and Institute of Genome Sciences, National Yang Ming Chiao Tung University, Taipei 112, Taiwan
| | - Liang-Hsuan Tsao
- Department of Life Sciences and Institute of Genome Sciences, National Yang Ming Chiao Tung University, Taipei 112, Taiwan
| | - Tsung-Han Yeh
- Department of Life Sciences and Institute of Genome Sciences, National Yang Ming Chiao Tung University, Taipei 112, Taiwan
| | - Yu-Chia Chen
- Department of Life Sciences and Institute of Genome Sciences, National Yang Ming Chiao Tung University, Taipei 112, Taiwan
| | - Ping-Yen Wu
- Department of Life Sciences and Institute of Genome Sciences, National Yang Ming Chiao Tung University, Taipei 112, Taiwan
| | - Tsu-Wei Wang
- Department of Life Science, National Taiwan Normal University, Taipei 116, Taiwan
| | - Jenn-Yah Yu
- Department of Life Sciences and Institute of Genome Sciences, National Yang Ming Chiao Tung University, Taipei 112, Taiwan.,Brain Research Center, National Yang Ming Chiao Tung University, Taipei 112, Taiwan
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7
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Zhao YH, Li H, Zhao H, Sun WK, Wang Q, Li WW. An ancient interleukin-16-like molecule regulates hemocyte proliferation via integrin β1 in invertebrates. J Biol Chem 2021; 297:100943. [PMID: 34245782 PMCID: PMC8326423 DOI: 10.1016/j.jbc.2021.100943] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Revised: 06/10/2021] [Accepted: 07/06/2021] [Indexed: 12/27/2022] Open
Abstract
Interleukins (ILs) are cytokines with crucial functions in innate and adaptive immunity. IL genes are only found in vertebrates, except for IL-16, which has been cloned in some arthropod species. However, the function of this gene in invertebrates is unknown. In the present study, an IL-16-like gene (EsIL-16) was identified from the Chinese mitten crab Eriocheir sinensis. EsIL-16 was predicted to encode a precursor (proEsIL-16) that shares similarities with pro-IL-16 proteins from insects and vertebrates. We show that caspase-3 processes proEsIL-16 into an approximately 144-kDa N-terminal prodomain with nuclear import activity and an approximately 34-kDa mature peptide that might be secreted into the extracellular region. EsIL-16 mRNA could be detected in all analyzed tissues and was significantly upregulated after immune challenge both in vitro and in vivo. T7 phage display library screening suggested potential binding activity between EsIL-16 and integrin, which was confirmed by coimmunoprecipitation assay. Interestingly, EsIL-16 promoted cell proliferation via integrin β1 in primary cultured crab hemocytes and Drosophila S2 cells. Furthermore, the interaction between EsIL-16 and integrin β1 was necessary to efficiently protect the host from bacterial infection. To our knowledge, this study revealed integrin β1 as a receptor for IL-16 and the function of this interaction in hemocyte proliferation in invertebrates for the first time. These results provide new insights into the regulation of innate immune responses in invertebrates and shed the light on the evolution of ILs within the animal kingdom.
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Affiliation(s)
- Yue-Hong Zhao
- 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
| | - Hui Zhao
- Laboratory of Invertebrate Immunological Defense & Reproductive Biology, School of Life Sciences, East China Normal University, Shanghai, China
| | - Wei-Kang Sun
- 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.
| | - Wei-Wei Li
- Laboratory of Invertebrate Immunological Defense & Reproductive Biology, School of Life Sciences, East China Normal University, Shanghai, China.
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Li C, Zhang K, Pan G, Zhang L, Hu X, Zhao G, Deng C, Tan M, Li C, Xu M, Su J, Shen L, Kausar S, Yang L, Abbas MN, Cui H. Bmintegrin β1: A broadly expressed molecule modulates the innate immune response of Bombyx mori. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2021; 114:103869. [PMID: 32950537 DOI: 10.1016/j.dci.2020.103869] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Revised: 09/06/2020] [Accepted: 09/07/2020] [Indexed: 06/11/2023]
Abstract
Integrins are transmembrane glycoproteins that are broadly distributed in living organisms. As a heterodimer, they contain an α and a β subunit, which are reported to be associated with various physiological and pathological processes. In the present study, a 2502 bp full-length cDNA sequence of Bmintegrin β1 was obtained from the silkworm, Bombyx mori. Bmintegrin β1 belongs to the β subunit of the integrin family and contains several typical structures of integrins. Gene expression profile analysis demonstrated that Bmintegrin β1 was ubiquitously expressed in all tested tissues and organs, with the maximum expression levels in fat body and hemocytes. The immunofluorescence results showed that Bmintegrin β1 was located in the cell membrane and widely distributed in fat bodies and different types of hemocytes. Bmintegrin β1 expression was remarkably increased after challenging with different kinds of bacteria and pathogen-associated molecular patterns (PAMPs). Further investigation revealed that Bmintegrin β1 could participate in the agglutination of pathogenic bacteria possibly through direct binding with the relative bacteria and PAMPs. Altogether, this study provides a novel insight into the immune functional features of Bmintegrin β1.
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Affiliation(s)
- Chongyang Li
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory for Sericulture Biology and Genetic Breeding, Ministry of Agriculture and Rural Affairs, College of Biotechnology, Southwest University, Chongqing, 400716, China; Cancer Center, Medical Research Institute, Southwest University, Chongqing, 400716, China; Chongqing Engineering and Technology Research Centre for Silk Biomaterials and Regenerative Medicine, Chongqing, 400716, China; Engineering Research Center for Cancer Biomedical and Translational Medicine, Southwest University, Chongqing, 400716, China
| | - Kui Zhang
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory for Sericulture Biology and Genetic Breeding, Ministry of Agriculture and Rural Affairs, College of Biotechnology, Southwest University, Chongqing, 400716, China; Cancer Center, Medical Research Institute, Southwest University, Chongqing, 400716, China; Chongqing Engineering and Technology Research Centre for Silk Biomaterials and Regenerative Medicine, Chongqing, 400716, China; Engineering Research Center for Cancer Biomedical and Translational Medicine, Southwest University, Chongqing, 400716, China
| | - Guangzhao Pan
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory for Sericulture Biology and Genetic Breeding, Ministry of Agriculture and Rural Affairs, College of Biotechnology, Southwest University, Chongqing, 400716, China; Cancer Center, Medical Research Institute, Southwest University, Chongqing, 400716, China; Chongqing Engineering and Technology Research Centre for Silk Biomaterials and Regenerative Medicine, Chongqing, 400716, China; Engineering Research Center for Cancer Biomedical and Translational Medicine, Southwest University, Chongqing, 400716, China
| | - Lei Zhang
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory for Sericulture Biology and Genetic Breeding, Ministry of Agriculture and Rural Affairs, College of Biotechnology, Southwest University, Chongqing, 400716, China; Cancer Center, Medical Research Institute, Southwest University, Chongqing, 400716, China; Chongqing Engineering and Technology Research Centre for Silk Biomaterials and Regenerative Medicine, Chongqing, 400716, China; Engineering Research Center for Cancer Biomedical and Translational Medicine, Southwest University, Chongqing, 400716, China
| | - Xin Hu
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory for Sericulture Biology and Genetic Breeding, Ministry of Agriculture and Rural Affairs, College of Biotechnology, Southwest University, Chongqing, 400716, China; Cancer Center, Medical Research Institute, Southwest University, Chongqing, 400716, China; Chongqing Engineering and Technology Research Centre for Silk Biomaterials and Regenerative Medicine, Chongqing, 400716, China; Engineering Research Center for Cancer Biomedical and Translational Medicine, Southwest University, Chongqing, 400716, China
| | - Gaichao Zhao
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory for Sericulture Biology and Genetic Breeding, Ministry of Agriculture and Rural Affairs, College of Biotechnology, Southwest University, Chongqing, 400716, China; Cancer Center, Medical Research Institute, Southwest University, Chongqing, 400716, China; Chongqing Engineering and Technology Research Centre for Silk Biomaterials and Regenerative Medicine, Chongqing, 400716, China; Engineering Research Center for Cancer Biomedical and Translational Medicine, Southwest University, Chongqing, 400716, China
| | - Chaowei Deng
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory for Sericulture Biology and Genetic Breeding, Ministry of Agriculture and Rural Affairs, College of Biotechnology, Southwest University, Chongqing, 400716, China; Cancer Center, Medical Research Institute, Southwest University, Chongqing, 400716, China; Chongqing Engineering and Technology Research Centre for Silk Biomaterials and Regenerative Medicine, Chongqing, 400716, China; Engineering Research Center for Cancer Biomedical and Translational Medicine, Southwest University, Chongqing, 400716, China
| | - Mengqin Tan
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory for Sericulture Biology and Genetic Breeding, Ministry of Agriculture and Rural Affairs, College of Biotechnology, Southwest University, Chongqing, 400716, China; Cancer Center, Medical Research Institute, Southwest University, Chongqing, 400716, China; Chongqing Engineering and Technology Research Centre for Silk Biomaterials and Regenerative Medicine, Chongqing, 400716, China; Engineering Research Center for Cancer Biomedical and Translational Medicine, Southwest University, Chongqing, 400716, China
| | - Changhong Li
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory for Sericulture Biology and Genetic Breeding, Ministry of Agriculture and Rural Affairs, College of Biotechnology, Southwest University, Chongqing, 400716, China; Cancer Center, Medical Research Institute, Southwest University, Chongqing, 400716, China; Chongqing Engineering and Technology Research Centre for Silk Biomaterials and Regenerative Medicine, Chongqing, 400716, China; Engineering Research Center for Cancer Biomedical and Translational Medicine, Southwest University, Chongqing, 400716, China
| | - Man Xu
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory for Sericulture Biology and Genetic Breeding, Ministry of Agriculture and Rural Affairs, College of Biotechnology, Southwest University, Chongqing, 400716, China; Cancer Center, Medical Research Institute, Southwest University, Chongqing, 400716, China; Chongqing Engineering and Technology Research Centre for Silk Biomaterials and Regenerative Medicine, Chongqing, 400716, China; Engineering Research Center for Cancer Biomedical and Translational Medicine, Southwest University, Chongqing, 400716, China
| | - Jingjing Su
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory for Sericulture Biology and Genetic Breeding, Ministry of Agriculture and Rural Affairs, College of Biotechnology, Southwest University, Chongqing, 400716, China; Cancer Center, Medical Research Institute, Southwest University, Chongqing, 400716, China; Chongqing Engineering and Technology Research Centre for Silk Biomaterials and Regenerative Medicine, Chongqing, 400716, China; Engineering Research Center for Cancer Biomedical and Translational Medicine, Southwest University, Chongqing, 400716, China
| | - Li Shen
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory for Sericulture Biology and Genetic Breeding, Ministry of Agriculture and Rural Affairs, College of Biotechnology, Southwest University, Chongqing, 400716, China; Cancer Center, Medical Research Institute, Southwest University, Chongqing, 400716, China; Chongqing Engineering and Technology Research Centre for Silk Biomaterials and Regenerative Medicine, Chongqing, 400716, China; Engineering Research Center for Cancer Biomedical and Translational Medicine, Southwest University, Chongqing, 400716, China
| | - Saima Kausar
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory for Sericulture Biology and Genetic Breeding, Ministry of Agriculture and Rural Affairs, College of Biotechnology, Southwest University, Chongqing, 400716, China; Cancer Center, Medical Research Institute, Southwest University, Chongqing, 400716, China; Chongqing Engineering and Technology Research Centre for Silk Biomaterials and Regenerative Medicine, Chongqing, 400716, China; Engineering Research Center for Cancer Biomedical and Translational Medicine, Southwest University, Chongqing, 400716, China
| | - Liqun Yang
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory for Sericulture Biology and Genetic Breeding, Ministry of Agriculture and Rural Affairs, College of Biotechnology, Southwest University, Chongqing, 400716, China; Cancer Center, Medical Research Institute, Southwest University, Chongqing, 400716, China; Chongqing Engineering and Technology Research Centre for Silk Biomaterials and Regenerative Medicine, Chongqing, 400716, China; Engineering Research Center for Cancer Biomedical and Translational Medicine, Southwest University, Chongqing, 400716, China
| | - Muhammad Nadeem Abbas
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory for Sericulture Biology and Genetic Breeding, Ministry of Agriculture and Rural Affairs, College of Biotechnology, Southwest University, Chongqing, 400716, China; Cancer Center, Medical Research Institute, Southwest University, Chongqing, 400716, China; Chongqing Engineering and Technology Research Centre for Silk Biomaterials and Regenerative Medicine, Chongqing, 400716, China; Engineering Research Center for Cancer Biomedical and Translational Medicine, Southwest University, Chongqing, 400716, China.
| | - Hongjuan Cui
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory for Sericulture Biology and Genetic Breeding, Ministry of Agriculture and Rural Affairs, College of Biotechnology, Southwest University, Chongqing, 400716, China; Cancer Center, Medical Research Institute, Southwest University, Chongqing, 400716, China; Chongqing Engineering and Technology Research Centre for Silk Biomaterials and Regenerative Medicine, Chongqing, 400716, China; Engineering Research Center for Cancer Biomedical and Translational Medicine, Southwest University, Chongqing, 400716, China.
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9
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Fox EF, Lamb MC, Mellentine SQ, Tootle TL. Prostaglandins regulate invasive, collective border cell migration. Mol Biol Cell 2020; 31:1584-1594. [PMID: 32432969 PMCID: PMC7521797 DOI: 10.1091/mbc.e19-10-0578] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
While prostaglandins (PGs), short-range lipid signals, regulate single cell migration, their roles in collective migration remain unclear. To address this, we use Drosophila border cell migration, an invasive, collective migration that occurs during Stage 9 of oogenesis. Pxt is the Drosophila cyclooxygenase-like enzyme responsible for PG synthesis. Loss of Pxt results in both delayed border cell migration and elongated clusters, whereas somatic Pxt knockdown causes delayed migration and compacted clusters. These findings suggest PGs act in both the border cells and nurse cells, the substrate on which the border cells migrate. As PGs regulate the actin bundler Fascin, and Fascin is required for on-time migration, we assessed whether PGs regulate Fascin to promote border cell migration. Coreduction of Pxt and Fascin results in delayed migration and elongated clusters. The latter may be due to altered cell adhesion, as loss of Pxt or Fascin, or coreduction of both, decreases integrin levels on the border cell membranes. Conversely, integrin localization is unaffected by somatic knockdown of Pxt. Together these data lead to the model that PG signaling controls Fascin in the border cells to promote migration and in the nurse cells to maintain cluster cohesion.
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Affiliation(s)
- Emily F Fox
- Department of Anatomy and Cell Biology, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, IA 52242
| | - Maureen C Lamb
- Department of Anatomy and Cell Biology, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, IA 52242
| | - Samuel Q Mellentine
- Department of Anatomy and Cell Biology, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, IA 52242
| | - Tina L Tootle
- Department of Anatomy and Cell Biology, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, IA 52242
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10
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Mondragon AA, Yalonetskaya A, Ortega AJ, Zhang Y, Naranjo O, Elguero J, Chung WS, McCall K. Lysosomal Machinery Drives Extracellular Acidification to Direct Non-apoptotic Cell Death. Cell Rep 2020; 27:11-19.e3. [PMID: 30943394 PMCID: PMC6613820 DOI: 10.1016/j.celrep.2019.03.034] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Revised: 02/18/2019] [Accepted: 03/08/2019] [Indexed: 02/07/2023] Open
Abstract
Cell death is a fundamental aspect of development, homeostasis, and disease; yet, our understanding of non-apoptotic forms of cell death is limited. One such form is phagoptosis, in which one cell utilizes phagocytosis machinery to kill another cell that would otherwise continue living. We have previously identified a non-autonomous requirement of phagocytosis machinery for the developmental programmed cell death of germline nurse cells in the Drosophila ovary; however, the precise mechanism of death remained elusive. Here, we show that lysosomal machinery acting in epithelial follicle cells is used to non-autonomously induce the death of nearby germline cells. Stretch follicle cells recruit V-ATPases and chloride channels to their plasma membrane to extracellularly acidify the germline and release cathepsins that destroy the nurse cells. Our results reveal a role for lysosomal machinery acting at the plasma membrane to cause the death of neighboring cells, providing insight into mechanisms driving non-autonomous cell death. Mondragon et al. show that V-ATPase proton pumps localize to the plasma membrane of follicle cells and promote extracellular acidification to eliminate adjacent nurse cells in the Drosophila ovary. The follicle cells subsequently release cathepsins by exocytosis into the nurse cells to promote their final degradation.
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Affiliation(s)
- Albert A Mondragon
- Department of Biology, Boston University, 5 Cummington Mall, Boston, MA 02215, USA; Program in Molecular Biology, Cell Biology, and Biochemistry, Boston University, Boston, MA 02215, USA
| | - Alla Yalonetskaya
- Department of Biology, Boston University, 5 Cummington Mall, Boston, MA 02215, USA
| | - Anthony J Ortega
- Department of Biology, Boston University, 5 Cummington Mall, Boston, MA 02215, USA
| | - Yuanhang Zhang
- Department of Biology, Boston University, 5 Cummington Mall, Boston, MA 02215, USA
| | - Oandy Naranjo
- Department of Biology, Boston University, 5 Cummington Mall, Boston, MA 02215, USA
| | - Johnny Elguero
- Department of Biology, Boston University, 5 Cummington Mall, Boston, MA 02215, USA
| | - Won-Suk Chung
- Department of Biological Sciences, KAIST, Daejeon, South Korea
| | - Kimberly McCall
- Department of Biology, Boston University, 5 Cummington Mall, Boston, MA 02215, USA.
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11
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Scheys F, Van Damme EJM, De Schutter K, Staes A, Gevaert K, Smagghe G. Evolutionarily conserved and species-specific glycoproteins in the N-glycoproteomes of diverse insect species. INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY 2018; 100:22-29. [PMID: 29906502 DOI: 10.1016/j.ibmb.2018.04.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 04/10/2018] [Accepted: 04/27/2018] [Indexed: 05/11/2023]
Abstract
N-glycosylation is one of the most abundant and conserved protein modifications in eukaryotes. The attachment of N-glycans to proteins can modulate their properties and influences numerous important biological processes, such as protein folding and cellular attachment. Recently, it has been shown that protein N-glycosylation plays a vital role in insect development and survival, which makes the glycans an interesting target for pest control. Despite the importance of protein N-glycosylation in insects, knowledge about insect N-glycoproteomes is scarce. To fill this gap, the N-glycosites were identified in proteins from three major pest insects, spanning different insect orders and diverging in post-embryonic development, feeding mechanism and evolutionary ancestry: Drosophila melanogaster (Diptera), Tribolium castaneum (Coleoptera) and Acyrthosiphon pisum (Hemiptera). The N-glyco-FASP method for isolation of N-glycopeptides was optimized to study the insect N-glycosites and allowed the identification of 889 N-glycosylation sites in T. castaneum, 941 in D. melanogaster and 1338 in A. pisum. Although a large set of the corresponding glycoproteins is shared among the three insects, species- and order-specific glycoproteins were also identified. The functionality of the insect glycoproteins together with the conservation of the N-glycosites throughout evolution is discussed. This information can help in the elaboration of novel pest insect control strategies based on interference in insect glycosylation.
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Affiliation(s)
- Freja Scheys
- Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000, Ghent, Belgium; Department of Biotechnology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000, Ghent, Belgium
| | - Els J M Van Damme
- Department of Biotechnology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000, Ghent, Belgium
| | - Kristof De Schutter
- Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000, Ghent, Belgium
| | - An Staes
- VIB-UGent Center for Biotechnology, Albert Baertsoenkaai 3, B-9000, Ghent, Belgium; Department of Biochemistry, Ghent University, Albert Baertsoenkaai 3, B-9000, Ghent, Belgium
| | - Kris Gevaert
- VIB-UGent Center for Biotechnology, Albert Baertsoenkaai 3, B-9000, Ghent, Belgium; Department of Biochemistry, Ghent University, Albert Baertsoenkaai 3, B-9000, Ghent, Belgium
| | - Guy Smagghe
- Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000, Ghent, Belgium.
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12
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Cha IJ, Lee JH, Cho KS, Lee SB. Drosophila tensin plays an essential role in cell migration and planar polarity formation during oogenesis by mediating integrin-dependent extracellular signals to actin organization. Biochem Biophys Res Commun 2017; 484:702-709. [DOI: 10.1016/j.bbrc.2017.01.183] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Accepted: 01/31/2017] [Indexed: 12/17/2022]
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13
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Saadin A, Starz-Gaiano M. Circuitous Genetic Regulation Governs a Straightforward Cell Migration. Trends Genet 2016; 32:660-673. [PMID: 27600524 DOI: 10.1016/j.tig.2016.08.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Revised: 08/01/2016] [Accepted: 08/02/2016] [Indexed: 12/19/2022]
Abstract
Drosophila border cells undergo a straightforward and stereotypical collective migration during egg development. However, a complex genetic program underlies this process. A variety of approaches, including biochemical, genetic, and imaging strategies have identified many regulatory components, revealing layers of control. This complexity suggests that the active processes of evaluating the environment, remodeling the cytoskeleton, and coordinating movements among cells, demand rapid systems for modulating cell behaviors. Multiple signaling inputs, nodes of integration, and feedback loops act as molecular rheostats to fine-tune gene expression levels and physical responses. Since key genetic regulators of border cell migration have been shown to be required in other types of cell migration, this model system continues to provide an important avenue for genetic discovery.
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Affiliation(s)
- Afsoon Saadin
- Department of Biological Sciences, University of Maryland Baltimore County, Baltimore, MD 21250, USA
| | - Michelle Starz-Gaiano
- Department of Biological Sciences, University of Maryland Baltimore County, Baltimore, MD 21250, USA.
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14
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Phagocytosis genes nonautonomously promote developmental cell death in the Drosophila ovary. Proc Natl Acad Sci U S A 2016; 113:E1246-55. [PMID: 26884181 DOI: 10.1073/pnas.1522830113] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Programmed cell death (PCD) is usually considered a cell-autonomous suicide program, synonymous with apoptosis. Recent research has revealed that PCD is complex, with at least a dozen cell death modalities. Here, we demonstrate that the large-scale nonapoptotic developmental PCD in the Drosophila ovary occurs by an alternative cell death program where the surrounding follicle cells nonautonomously promote death of the germ line. The phagocytic machinery of the follicle cells, including Draper, cell death abnormality (Ced)-12, and c-Jun N-terminal kinase (JNK), is essential for the death and removal of germ-line-derived nurse cells during late oogenesis. Cell death events including acidification, nuclear envelope permeabilization, and DNA fragmentation of the nurse cells are impaired when phagocytosis is inhibited. Moreover, elimination of a small subset of follicle cells prevents nurse cell death and cytoplasmic dumping. Developmental PCD in the Drosophila ovary is an intriguing example of nonapoptotic, nonautonomous PCD, providing insight on the diversity of cell death mechanisms.
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15
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Abstract
Programmed cell death (PCD) is essential for health and development. Generally, the last step of PCD is clearance, or engulfment, by phagocytes. Engulfment can be broken down into five basic steps: attraction of the phagocyte, recognition of the dying cell, internalization, phagosome maturation, and acidification of the engulfed material. The Drosophila melanogaster ovary serves as an excellent model to study diverse types of PCD and engulfment by epithelial cells. Here, we describe several methods to detect and analyze multiple steps of engulfment in the Drosophila ovary: recognition, vesicle uptake, phagosome maturation, and acidification. Annexin V detects phosphatidylserine, which is flipped to the outer leaflet of the plasma membrane of apoptotic cells, serving as an "eat me" signal. Several germline markers including tral-GFP, Orb, and cleaved Dcp-1 can all be used to label the germline and visualize its uptake into engulfing follicle cells. Drosophila strains expressing GFP and mCherry protein fusions can enable a detailed analysis of phagosome maturation. LysoTracker labels highly acidified compartments, marking phagolysosomes. Together these labels can be used to mark the progression of engulfment in Drosophila follicle cells.
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16
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Huang Y, Zhao LL, Feng JL, Zhu HX, Huang X, Ren Q, Wang W. A novel integrin function in innate immunity from Chinese mitten crab (Eriocheir sinensis). DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2015; 52:155-165. [PMID: 26004499 DOI: 10.1016/j.dci.2015.05.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2015] [Revised: 05/15/2015] [Accepted: 05/18/2015] [Indexed: 06/04/2023]
Abstract
Integrins belong to a superfamily of conserved α β heterodimeric cell surface receptors that have critical function in cell migration, differentiation, and survival. In this study, an integrin called EsIntegrin was identified from Chinese mitten crab Eriocheir sinensis. EsIntegrin cDNA is 4415 bp long with a 2457 bp open reading frame that encodes an 818 amino acid protein. EsIntegrin contains a signal peptide, an integrin beta subunit (N-terminal portion of extracellular region) INB domain, an epidermal growth factor (hEGF) domain, an integrin B tail domain, a transmembrane region, and an integrin b cyt domain. EsIntegrin was mainly expressed in hemocytes and the heart, with a relatively lower expression level in gills, nerves, intestine, hepatopancreas, muscles, and eyestalk. When healthy crabs were challenged with LPS, PGN, Staphyloccocus aureus, or Vibrio parahaemolyticus, EsIntegrin expression level was upregulated significantly. Recombinant EsIntegrin has agglutination activity to Gram-positive (e.g., S. aureus and Bacillus subtilis) and Gram-negative bacteria (e.g., V. parahaemolyticus and Aeromonas hydrophila) in the presence of calcium. Furthermore, rEsIntegrin could not only bind to various bacteria such as S. aureus, Micrococcus luteus, B. subtilis, Bacillus megaterium, Bacillus thuringiensis, V. parahaemolyticus, Vibrio anguillarum, A. hydrophila, Vibrio natriegens, and Escherichia coli, but this compound also helped crabs in clearing virulent Gram-negative bacterium, V. parahaemolyticus, in vivo. These data suggested that EsIntegrin might function as cellular receptor that is involved in anti-bacterial immunity from E. sinensis.
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Affiliation(s)
- Ying Huang
- Jiangsu Key Laboratory for Biodiversity & Biotechnology and Jiangsu Key Laboratory for Aquatic Crustacean Diseases, College of Life Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210046, China
| | - Ling-Ling Zhao
- Jiangsu Key Laboratory for Biodiversity & Biotechnology and Jiangsu Key Laboratory for Aquatic Crustacean Diseases, College of Life Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210046, China
| | - Jin-Ling Feng
- Jiangsu Key Laboratory for Biodiversity & Biotechnology and Jiangsu Key Laboratory for Aquatic Crustacean Diseases, College of Life Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210046, China
| | - Huan-Xi Zhu
- Jiangsu Key Laboratory for Biodiversity & Biotechnology and Jiangsu Key Laboratory for Aquatic Crustacean Diseases, College of Life Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210046, China
| | - Xin Huang
- Jiangsu Key Laboratory for Biodiversity & Biotechnology and Jiangsu Key Laboratory for Aquatic Crustacean Diseases, College of Life Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210046, China
| | - Qian Ren
- Jiangsu Key Laboratory for Biodiversity & Biotechnology and Jiangsu Key Laboratory for Aquatic Crustacean Diseases, College of Life Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210046, China.
| | - Wen Wang
- Jiangsu Key Laboratory for Biodiversity & Biotechnology and Jiangsu Key Laboratory for Aquatic Crustacean Diseases, College of Life Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210046, China.
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17
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Meehan TL, Kleinsorge SE, Timmons AK, Taylor JD, McCall K. Polarization of the epithelial layer and apical localization of integrins are required for engulfment of apoptotic cells in the Drosophila ovary. Dis Model Mech 2015; 8:1603-14. [PMID: 26398951 PMCID: PMC4728319 DOI: 10.1242/dmm.021998] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Accepted: 09/14/2015] [Indexed: 12/28/2022] Open
Abstract
Inefficient clearance of dead cells or debris by epithelial cells can lead to or exacerbate debilitating conditions such as retinitis pigmentosa, macular degeneration, chronic obstructive pulmonary disease and asthma. Despite the importance of engulfment by epithelial cells, little is known about the molecular changes that are required within these cells. The misregulation of integrins has previously been associated with disease states, suggesting that a better understanding of the regulation of receptor trafficking could be key to treating diseases caused by defects in phagocytosis. Here, we demonstrate that the integrin heterodimer αPS3/βPS becomes apically enriched and is required for engulfment by the epithelial follicle cells of the Drosophila ovary. We found that integrin heterodimer localization and function is largely directed by the α-subunit. Moreover, proper cell polarity promotes asymmetric integrin enrichment, suggesting that αPS3/βPS trafficking occurs in a polarized fashion. We show that several genes previously known for their roles in trafficking and cell migration are also required for engulfment. Moreover, as in mammals, the same α-integrin subunit is required by professional and non-professional phagocytes and migrating cells in Drosophila. Our findings suggest that migrating and engulfing cells use common machinery, and demonstrate a crucial role for integrin function and polarized trafficking of integrin subunits during engulfment. This study also establishes the epithelial follicle cells of the Drosophila ovary as a powerful model for understanding the molecular changes required for engulfment by a polarized epithelium. Summary: Apical integrin localization, mediated by polarized and directed trafficking, is crucial for proper engulfment by epithelial cells.
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Affiliation(s)
- Tracy L Meehan
- Department of Biology, Boston University, 5 Cummington Mall, Boston, MA 02215, USA
| | - Sarah E Kleinsorge
- Department of Biology, Boston University, 5 Cummington Mall, Boston, MA 02215, USA
| | - Allison K Timmons
- Department of Biology, Boston University, 5 Cummington Mall, Boston, MA 02215, USA
| | - Jeffrey D Taylor
- Department of Biology, Boston University, 5 Cummington Mall, Boston, MA 02215, USA
| | - Kimberly McCall
- Department of Biology, Boston University, 5 Cummington Mall, Boston, MA 02215, USA
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18
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Zhang K, Xu M, Su J, Yu S, Sun Z, Li Y, Zhang W, Hou J, Shang L, Cui H. Characterization and identification of the integrin family in silkworm, Bombyx mori. Gene 2014; 549:149-55. [DOI: 10.1016/j.gene.2014.07.060] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2014] [Revised: 07/13/2014] [Accepted: 07/23/2014] [Indexed: 11/29/2022]
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19
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Rodriguez-Fraticelli AE, Martin-Belmonte F. Picking up the threads: extracellular matrix signals in epithelial morphogenesis. Curr Opin Cell Biol 2014; 30:83-90. [DOI: 10.1016/j.ceb.2014.06.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2014] [Revised: 06/16/2014] [Accepted: 06/16/2014] [Indexed: 01/30/2023]
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20
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Wan P, Wang D, Luo J, Chu D, Wang H, Zhang L, Chen J. Guidance receptor promotes the asymmetric distribution of exocyst and recycling endosome during collective cell migration. Development 2013; 140:4797-806. [DOI: 10.1242/dev.094979] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
During collective migration, guidance receptors signal downstream to result in a polarized distribution of molecules, including cytoskeletal regulators and guidance receptors themselves, in response to an extracellular gradient of chemotactic factors. However, the underlying mechanism of asymmetry generation in the context of the migration of a group of cells is not well understood. Using border cells in the Drosophila ovary as a model system for collective migration, we found that the receptor tyrosine kinase (RTK) PDGF/VEGF receptor (PVR) is required for a polarized distribution of recycling endosome and exocyst in the leading cells of the border cell cluster. Interestingly, PVR signaled through the small GTPase Rac to positively affect the levels of Rab11-labeled recycling endosomes, probably in an F-actin-dependent manner. Conversely, the exocyst complex component Sec3 was required for the asymmetric localization of RTK activity and F-actin, similar to that previously reported for the function of Rab11. Together, these results suggested a positive-feedback loop in border cells, in which RTKs such as PVR act to induce a higher level of vesicle recycling and tethering activity in the leading cells, which in turn enables RTK activity to be distributed in a more polarized fashion at the front. We also provided evidence that E-cadherin, the major adhesion molecule for border cell migration, is a specific cargo in the Rab11-labeled recycling endosomes and that Sec3 is required for the delivery of the E-cadherin-containing vesicles to the membrane.
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Affiliation(s)
- Ping Wan
- Model Animal Research Center, and MOE Key Laboratory of Model Animals for Disease Study, Nanjing University, Nanjing, China 210061
| | - Dou Wang
- Model Animal Research Center, and MOE Key Laboratory of Model Animals for Disease Study, Nanjing University, Nanjing, China 210061
| | - Jun Luo
- Model Animal Research Center, and MOE Key Laboratory of Model Animals for Disease Study, Nanjing University, Nanjing, China 210061
| | - Dandan Chu
- Model Animal Research Center, and MOE Key Laboratory of Model Animals for Disease Study, Nanjing University, Nanjing, China 210061
- Jiangsu Key Laboratory of Neuroregeneration, Nantong University, Nantong, China 226001
| | - Heng Wang
- Model Animal Research Center, and MOE Key Laboratory of Model Animals for Disease Study, Nanjing University, Nanjing, China 210061
| | - Lijun Zhang
- Model Animal Research Center, and MOE Key Laboratory of Model Animals for Disease Study, Nanjing University, Nanjing, China 210061
| | - Jiong Chen
- Model Animal Research Center, and MOE Key Laboratory of Model Animals for Disease Study, Nanjing University, Nanjing, China 210061
- Zhejiang Key Laboratory for Technology and Application of Model Organisms, School of Life Sciences, Wenzhou Medical College, Wenzhou, China 325035
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Osterfield M, Du X, Schüpbach T, Wieschaus E, Shvartsman SY. Three-dimensional epithelial morphogenesis in the developing Drosophila egg. Dev Cell 2013; 24:400-10. [PMID: 23449472 DOI: 10.1016/j.devcel.2013.01.017] [Citation(s) in RCA: 95] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2012] [Revised: 12/21/2012] [Accepted: 01/20/2013] [Indexed: 10/27/2022]
Abstract
Morphogenesis of the respiratory appendages on eggshells of Drosophila species provides a powerful experimental system for studying how cell sheets give rise to complex three-dimensional structures. In Drosophila melanogaster, each of the two tubular eggshell appendages is derived from a primordium comprising two distinct cell types. Using live imaging and three-dimensional image reconstruction, we demonstrate that the transformation of this two-dimensional primordium into a tube involves out-of-plane bending followed by a sequence of spatially ordered cell intercalations. These morphological transformations correlate with the appearance of complementary distributions of myosin and Bazooka in the primordium. These distributions suggest that a two-dimensional pattern of line tensions along cell-cell edges on the apical side of the epithelium is sufficient to produce the observed changes in morphology. Computational modeling shows that this mechanism could explain the main features of tissue deformation and cell rearrangements observed during three-dimensional morphogenesis.
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Affiliation(s)
- Miriam Osterfield
- Lewis-Sigler Institute for Integrative Genomics, Princeton, NJ 08544, USA
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22
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Group choreography: mechanisms orchestrating the collective movement of border cells. Nat Rev Mol Cell Biol 2012; 13:631-45. [PMID: 23000794 DOI: 10.1038/nrm3433] [Citation(s) in RCA: 170] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Cell movements are essential for animal development and homeostasis but also contribute to disease. Moving cells typically extend protrusions towards a chemoattractant, adhere to the substrate, contract and detach at the rear. It is less clear how cells that migrate in interconnected groups in vivo coordinate their behaviour and navigate through natural environments. The border cells of the Drosophila melanogaster ovary have emerged as an excellent model for the study of collective cell movement, aided by innovative genetic, live imaging, and photomanipulation techniques. Here we provide an overview of the molecular choreography of border cells and its more general implications.
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23
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Gates J. Drosophila egg chamber elongation: insights into how tissues and organs are shaped. Fly (Austin) 2012; 6:213-27. [PMID: 22940759 PMCID: PMC3519655 DOI: 10.4161/fly.21969] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
As tissues and organs are formed, they acquire a specific shape that plays an integral role in their ability to function properly. A relatively simple system that has been used to examine how tissues and organs are shaped is the formation of an elongated Drosophila egg. While it has been known for some time that Drosophila egg elongation requires interactions between a polarized intracellular basal actin network and a polarized extracellular network of basal lamina proteins, how these interactions contribute to egg elongation remained unclear. Recent studies using live imaging have revealed two novel processes, global tissue rotation and oscillating basal actomyosin contractions, which have provided significant insight into how the two polarized protein networks cooperate to produce an elongated egg. This review summarizes the proteins involved in Drosophila egg elongation and how this recent work has contributed to our current understanding of how egg elongation is achieved.
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Affiliation(s)
- Julie Gates
- Department of Biology, Bucknell University,Lewisburg, PA, USA.
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24
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Kókai E, Páldy FS, Somogyi K, Chougule A, Pál M, Kerekes É, Deák P, Friedrich P, Dombrádi V, Ádám G. CalpB modulates border cell migration in Drosophila egg chambers. BMC DEVELOPMENTAL BIOLOGY 2012; 12:20. [PMID: 22827336 PMCID: PMC3441222 DOI: 10.1186/1471-213x-12-20] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/19/2011] [Accepted: 07/24/2012] [Indexed: 12/14/2022]
Abstract
Background Calpains are calcium regulated intracellular cysteine proteases implicated in a variety of physiological functions and pathological conditions. The Drosophila melanogaster genome contains only two genes, CalpA and CalpB coding for canonical, active calpain enzymes. The movement of the border cells in Drosophila egg chambers is a well characterized model of the eukaryotic cell migration. Using this genetically pliable model we can investigate the physiological role of calpains in cell motility. Results We demonstrate at the whole organism level that CalpB is implicated in cell migration, while the structurally related CalpA paralog can not fulfill the same function. The downregulation of the CalpB gene by mutations or RNA interference results in a delayed migration of the border cells in Drosophila egg chambers. This phenotype is significantly enhanced when the focal adhesion complex genes encoding for α-PS2 integrin ( if), β-PS integrin ( mys) and talin ( rhea) are silenced. The reduction of CalpB activity diminishes the release of integrins from the rear end of the border cells. The delayed migration and the reduced integrin release phenotypes can be suppressed by expressing wild-type talin-head in the border cells but not talin-headR367A, a mutant form which is not able to bind β-PS integrin. CalpB can cleave talin in vitro, and the two proteins coimmunoprecipitate from Drosophila extracts. Conclusions The physiological function of CalpB in border cell motility has been demonstrated in vivo. The genetic interaction between the CalpB and the if, mys, as well as rhea genes, the involvement of active talin head-domains in the process, and the fact that CalpB and talin interact with each other collectively suggest that the limited proteolytic cleavage of talin is one of the possible mechanisms through which CalpB regulates cell migration.
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Affiliation(s)
- Endre Kókai
- Department of Medical Chemistry, Faculty of Medicine, University of Debrecen, Nagyerdei krt, 98, Debrecen H-4032, Hungary
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Zhang Y, Wang L, Wang L, Wu N, Zhou Z, Song L. An integrin from shrimp Litopenaeus vannamei mediated microbial agglutination and cell proliferation. PLoS One 2012; 7:e40615. [PMID: 22792387 PMCID: PMC3392225 DOI: 10.1371/journal.pone.0040615] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2012] [Accepted: 06/11/2012] [Indexed: 01/12/2023] Open
Abstract
BACKGROUND Integrins are a family of adhesion receptors which regulate cell proliferation, differentiation, leukocyte migration, and complement receptor-dependent phagocytosis. In invertebrates, as a cell adhesion receptor, β integrins play an important role for the balanced activation of immune defense responses especially during the encounter of infections. The present study attempts to characterize the immune functions of shrimp integrin (LvIntegrin) to have better understanding on the immune system and its regulation mechanisms in shrimps. METHODOLOGY A shrimp integrin was identified from the Pacific white shrimp Litopenaeus vannamei (designated as LvIntegrin). Its full-length cDNA was of 2621 bp with an open reading frame (ORF) of 2439 bp encoding a polypeptide of 812 amino acids. The mRNA expression of LvIntegrin was significantly up-regulated at 3, 6 and 12 h after Listonella anguillarum challenge. The cDNA fragment encoding β integrin domains (βA and hybrid domain) of LvIntegrin was recombined and expressed in Escherichia coli BL21(DE3)-pLysS. The recombinant protein (rLvIntegrin) could significantly agglutinate the tested microbe including E. coli JM109, L. anguillarum, Micrococcus luteus and Candida dattiladattila in the presence of divalent cations. Moreover, when NIH3T3 cells were cultured with rLvIntegrin, the proliferation rate increased significantly in a dose-dependent manner. CONCLUSIONS LvIntegrin, a shrimp β integrin was identified from L. vannamei, shared several highly conserved features. LvIntegrin exhibited broad-spectrum agglutination activity towards both bacteria and fungi and could improve the proliferation of NIH3T3 cells, indicating that LvIntegrin is involved in the immune response against microbe challenge and regulation of cell proliferation as a cell adhesion receptor in shrimp.
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Affiliation(s)
- Ying Zhang
- The Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China
- Research Center of Fishery Resources and Ecology, Shandong Marine Fisheries Research Institute, Yantai, China
| | - Leilei Wang
- The Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China
- Graduate University of the Chinese Academy of Sciences, Beijing, China
| | - Lingling Wang
- The Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China
| | - Ning Wu
- The Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China
| | - Zhi Zhou
- The Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China
| | - Linsheng Song
- The Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China
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Papagiannouli F, Lohmann I. Shaping the niche: lessons from the Drosophila testis and other model systems. Biotechnol J 2012; 7:723-36. [PMID: 22488937 DOI: 10.1002/biot.201100352] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2011] [Revised: 01/31/2012] [Accepted: 02/27/2012] [Indexed: 11/12/2022]
Abstract
Stem cells are fascinating, as they supply the cells that construct our adult bodies and replenish, as we age, worn out, damaged, and diseased tissues. Stem cell regulation relies on intrinsic signals but also on inputs emanating from the neighbouring niche. The Drosophila testis provides an excellent system for studying such processes. Although recent advances have uncovered several signalling, cytoskeletal and other factors affecting niche homeostasis and testis differentiation, many aspects of niche regulation and maintenance remain unsolved. In this review, we discuss aspects of niche establishment and integrity not yet fully understood and we compare it to the current knowledge in other model systems such as vertebrates and plants. We also address specific questions on stem cell maintenance and niche regulation in the Drosophila testis under the control of Hox genes. Finally, we provide insights on the striking functional conservation of homologous genes in plants and animals and their respective stem cell niches. Elucidating conserved mechanisms of stem cell control in both lineages could reveal the importance underlying this conservation and justify the evolutionary pressure to adapt homologous molecules for performing the same task.
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Affiliation(s)
- Fani Papagiannouli
- Centre for Organismal Studies (COS) Heidelberg and CellNetworks - Cluster of Excellence, Heidelberg, Germany.
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27
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Sampson CJ, Williams MJ. Real-time analysis of Drosophila post-embryonic haemocyte behaviour. PLoS One 2012; 7:e28783. [PMID: 22242151 PMCID: PMC3252279 DOI: 10.1371/journal.pone.0028783] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2011] [Accepted: 11/15/2011] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND The larval stage of the model organism Drosophila is frequently used to study host-pathogen interactions. During embryogenesis the cellular arm of the immune response, consisting of macrophage-like cells known as plasmatocytes, is extremely motile and functions to phagocytise pathogens and apoptotic bodies, as well as produce extracellular matrix. The cellular branch of the larval (post-embryonic) innate immune system consists of three cell types--plasmatocytes, crystal cells and lamellocytes--which are involved in the phagocytosis, encapsulation and melanisation of invading pathogens. Post-embryonic haemocyte motility is poorly understood thus further characterisation is required, for the purpose of standardisation. METHODOLOGY In order to examine post-embryonic haemocyte cytoskeletal dynamics or migration, the most commonly used system is in vitro cell lines. The current study employs an ex vivo system (an adaptation of in vitro cell incubation using primary cells), in which primary larval or pre-pupal haemocytes are isolated for short term analysis, in order to discover various aspects of their behaviour during events requiring cytoskeleton dynamics. SIGNIFICANCE The ex vivo method allows for real-time analysis and manipulation of primary post-embryonic haemocytes. This technique was used to characterise, and potentially standardised, larval and pre-pupal haemocyte cytoskeleton dynamics, assayed on different extracellular matrices. Using this method it was determined that, while larval haemocytes are unable to migrate, haemocytes recovered from pre-pupae are capable of migration.
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Affiliation(s)
- Christopher J. Sampson
- Institute of Biological and Environmental Sciences, University of Aberdeen, Aberdeen, United Kingdom
| | - Michael J. Williams
- Institute of Biological and Environmental Sciences, University of Aberdeen, Aberdeen, United Kingdom
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M6 membrane protein plays an essential role in Drosophila oogenesis. PLoS One 2011; 6:e19715. [PMID: 21603606 PMCID: PMC3095610 DOI: 10.1371/journal.pone.0019715] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2010] [Accepted: 04/14/2011] [Indexed: 12/03/2022] Open
Abstract
We had previously shown that the transmembrane glycoprotein M6a, a member of the proteolipid protein (PLP) family, regulates neurite/filopodium outgrowth, hence, M6a might be involved in neuronal remodeling and differentiation. In this work we focused on M6, the only PLP family member present in Drosophila, and ortholog to M6a. Unexpectedly, we found that decreased expression of M6 leads to female sterility. M6 is expressed in the membrane of the follicular epithelium in ovarioles throughout oogenesis. Phenotypes triggered by M6 downregulation in hypomorphic mutants included egg collapse and egg permeability, thus suggesting M6 involvement in eggshell biosynthesis. In addition, RNAi-mediated M6 knockdown targeted specifically to follicle cells induced an arrest of egg chamber development, revealing that M6 is essential in oogenesis. Interestingly, M6-associated phenotypes evidenced abnormal changes of the follicle cell shape and disrupted follicular epithelium in mid- and late-stage egg chambers. Therefore, we propose that M6 plays a role in follicular epithelium maintenance involving membrane cell remodeling during oogenesis in Drosophila.
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Spatial restriction of receptor tyrosine kinase activity through a polarized endocytic cycle controls border cell migration. Proc Natl Acad Sci U S A 2010; 107:22558-63. [PMID: 21149700 DOI: 10.1073/pnas.1010795108] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Border cell migration is a stereotyped migration occurring during the development of the Drosophila egg chamber. During this process, a cluster composed of six to eight follicle cells migrates between nurse cells toward the oocyte. Receptor tyrosine kinases (RTKs) are enriched at the leading edge of the follicle cells and establish the directionality of their migration. Endocytosis has been shown to play a role in the maintenance of this polarization; however, the mechanisms involved are largely unknown. In this study, we show that border cell migration requires the function of the small GTPases Rab5 and Rab11 that regulate trafficking through the early and the recycling endosome, respectively. Expression of a dominant negative form of rab11 induces a loss of the polarization of RTK activity, which correlates with a severe migration phenotype. In addition, we demonstrate that the exocyst component Sec15 is distributed in structures that are polarized during the migration process in a Rab11-dependent manner and that the down-regulation of different subunits of the exocyst also affects migration. Together, our data demonstrate a fundamental role for a plasma membrane-endosome trafficking cycle in the maintenance of active RTK at the leading edge of border cells during their migration.
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Hu J, Zhao H, Yu X, Liu J, Wang P, Chen J, Xu Q, Zhang W. Integrin β1 subunit from Ostrinia furnacalis hemocytes: molecular characterization, expression, and effects on the spreading of plasmatocytes. JOURNAL OF INSECT PHYSIOLOGY 2010; 56:1846-1856. [PMID: 20708011 DOI: 10.1016/j.jinsphys.2010.08.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2010] [Revised: 08/03/2010] [Accepted: 08/03/2010] [Indexed: 05/29/2023]
Abstract
When lepidopteran larvae are infected by a large quantity of pathogens or parasitized by nonadaptive parasitoids, hemocytes in the hemocoel will encapsulate these foreign invaders. Cellular encapsulation requires hemocytes, particularly plasmatocytes, to change their states from nonadhesive, spherical cells into adhesive, spreading cells. However, it is unclear how the changes of plasmatocytes are regulated. Here we report that the integrin β1 subunit from hemocytes of Ostrinia furnacalis (Ofint β1) plays an important role in regulating the spreading of plasmatocytes. The full length cDNA sequence (4477 bp) of Ofint β1 was cloned from hemocytes. Phylogenetic analysis showed that Ofint β1 belonged to the integrin βPS family of Drosophila melanogaster with highest sequence identity (78.7%) to the β-integrin of Pseudoplusia includens. Structural analysis of the deduced amino acid sequence indicated that Ofint β1 had similar functional domains to known β-integrins in other lepidopteran insects. RT-PCR, Northern blotting, Western blotting and immunohistochemical analyses showed that OfINT β1 was expressed mainly in hemocytes, especially in plasmatocytes, and weakly in fat body, Malpighian tubes and epidermis. After hemocytes had spread onto slides, fewer antibodies to OfINT β1 bound to the surface of plasmatocytes. Furthermore, anti-OfINT β1 serum clearly inhibited the spreading of plasmatocytes. Together these results indicate that OfINT β1 may play an important role in regulating the spreading of plasmatocytes.
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Affiliation(s)
- Jian Hu
- State Key Laboratory of Biocontrol, Sun Yat-sen University, Guangzhou 510275, China
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Bahri S, Wang S, Conder R, Choy J, Vlachos S, Dong K, Merino C, Sigrist S, Molnar C, Yang X, Manser E, Harden N. The leading edge during dorsal closure as a model for epithelial plasticity: Pak is required for recruitment of the Scribble complex and septate junction formation. Development 2010; 137:2023-32. [DOI: 10.1242/dev.045088] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Dorsal closure (DC) of the Drosophila embryo is a model for the study of wound healing and developmental epithelial fusions, and involves the sealing of a hole in the epidermis through the migration of the epidermal flanks over the tissue occupying the hole, the amnioserosa. During DC, the cells at the edge of the migrating epidermis extend Rac- and Cdc42-dependent actin-based lamellipodia and filopodia from their leading edge (LE), which exhibits a breakdown in apicobasal polarity as adhesions are severed with the neighbouring amnioserosa cells. Studies using mammalian cells have demonstrated that Scribble (Scrib), an important determinant of apicobasal polarity that functions in a protein complex, controls polarized cell migration through recruitment of Rac, Cdc42 and the serine/threonine kinase Pak, an effector for Rac and Cdc42, to the LE. We have used DC and the follicular epithelium to study the relationship between Pak and the Scrib complex at epithelial membranes undergoing changes in apicobasal polarity and adhesion during development. We propose that, during DC, the LE membrane undergoes an epithelial-to-mesenchymal-like transition to initiate epithelial sheet migration, followed by a mesenchymal-to-epithelial-like transition as the epithelial sheets meet up and restore cell-cell adhesion. This latter event requires integrin-localized Pak, which recruits the Scrib complex in septate junction formation. We conclude that there are bidirectional interactions between Pak and the Scrib complex modulating epithelial plasticity. Scrib can recruit Pak to the LE for polarized cell migration but, as migratory cells meet up, Pak can recruit the Scrib complex to restore apicobasal polarity and cell-cell adhesion.
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Affiliation(s)
- Sami Bahri
- Institute of Molecular and Cell Biology, 61 Biopolis Drive, 138673, Singapore
| | - Simon Wang
- Department of Molecular Biology and Biochemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada
| | - Ryan Conder
- Department of Molecular Biology and Biochemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada
| | - Juliana Choy
- Institute of Molecular and Cell Biology, 61 Biopolis Drive, 138673, Singapore
| | - Stephanie Vlachos
- Department of Molecular Biology and Biochemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada
| | - Kevin Dong
- Department of Molecular Biology and Biochemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada
| | - Carlos Merino
- Department of Physiology, McGill University, 3655 Sir William Osler, Montreal, Quebec H3G 1Y6, Canada
| | - Stephan Sigrist
- Department of Genetics, Institute for Biology, Freie Universität Berlin, 14195 Berlin, Germany
| | - Cristina Molnar
- Centro de Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Cientifícas and Universidad Autónoma de Madrid, Cantoblanco, Madrid 28049, Spain
| | - Xiaohang Yang
- Institute of Molecular and Cell Biology, 61 Biopolis Drive, 138673, Singapore
| | - Edward Manser
- Institute of Molecular and Cell Biology, 61 Biopolis Drive, 138673, Singapore
- Institute of Medical Biology, 61 Biopolis Drive, 138673, Singapore
| | - Nicholas Harden
- Department of Molecular Biology and Biochemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada
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Negreiros E, Fontenele M, Câmara AR, Araujo H. alphaPS1betaPS integrin receptors regulate the differential distribution of Sog fragments in polarized epithelia. Genesis 2010; 48:31-43. [PMID: 20017203 DOI: 10.1002/dvg.20579] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Bone morphogenetic proteins (BMPs) have important functions during epithelial development. In Drosophila, extracellular Short gastrulation (Sog) limits the action of the BMP family member Decapentaplegic (Dpp). We have shown that Integrin receptors regulate Sog activity and distribution during pupal wing development to direct placement of wing veins. Here, we show that Integrins perform a similar function in the follicular epithelium, impacting Dpp function during oogenesis and embryonic development. As reported for the wing, this effect is specific to mew, which codes for alphaPS1 integrin. Sog is subject to cleavage by metalloproteases, generating fragments with different properties. We also show that Integrins regulate the distribution of C- and N-terminal Sog fragments in both epithelia, suggesting they may regulate the quality of BMP outputs. Our data indicate that alphaPS1betaPS integrin receptors regulate the amount and type of Sog fragments available for diffusion in the extracellular space during oogenesis and pupal wing development.
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Affiliation(s)
- Erika Negreiros
- Institute for Biomedical Sciences, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil 21941-902
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Delon I, Brown NH. The integrin adhesion complex changes its composition and function during morphogenesis of an epithelium. J Cell Sci 2009; 122:4363-74. [PMID: 19903692 PMCID: PMC2779134 DOI: 10.1242/jcs.055996] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Cell adhesion to the extracellular matrix (ECM) is mediated by the integrin family of transmembrane receptors. Integrins link ECM ligands to the cytoskeleton, providing strong attachment to enable cell-shape change and tissue integrity. This connection is made possible by an intracellular complex of proteins, which links to actin filaments and controls signalling cascades that regulate cytoskeletal rearrangements. We have identified stress-fibre-associated focal adhesions that change their composition during tissue morphogenesis. Early expression of alphaPS1betaPS integrin decreases the levels of the actin-nucleating factors Enabled, Diaphanous and profilin, as well as downregulating the amount of F-actin incorporated into the stress fibres. As follicle cells mature in their developmental pathway and become squamous, the integrin in the focal adhesions changes from alphaPS1betaPS to alphaPS2betaPS. During the switch, stress fibres increase their length and change orientation, first changing by 90 degrees and then reorienting back. The normal rapid reorientation requires new expression of alphaPS2betaPS, which also permits recruitment of the adaptor protein tensin. Unexpectedly, it is the extracellular portion of the alphaPS2 subunit that provides the specificity for intracellular recruitment of tensin. Molecular variation of the integrin complex is thus a key component of developmentally programmed morphogenesis.
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Affiliation(s)
- Isabelle Delon
- Gurdon Institute and Department of Physiology, Development and Neuroscience, University of Cambridge, Tennis Court Road, Cambridge CB2 1QN, UK
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