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Detomasi TC, Batka AE, Valastyan JS, Hydorn MA, Craik CS, Bassler BL, Marletta MA. Proteases influence colony aggregation behavior in Vibrio cholerae. J Biol Chem 2023; 299:105386. [PMID: 37898401 PMCID: PMC10709122 DOI: 10.1016/j.jbc.2023.105386] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 10/03/2023] [Accepted: 10/16/2023] [Indexed: 10/30/2023] Open
Abstract
Aggregation behavior provides bacteria protection from harsh environments and threats to survival. Two uncharacterized proteases, LapX and Lap, are important for Vibrio cholerae liquid-based aggregation. Here, we determined that LapX is a serine protease with a preference for cleavage after glutamate and glutamine residues in the P1 position, which processes a physiologically based peptide substrate with a catalytic efficiency of 180 ± 80 M-1s-1. The activity with a LapX substrate identified by a multiplex substrate profiling by mass spectrometry screen was 590 ± 20 M-1s-1. Lap shares high sequence identity with an aminopeptidase (termed VpAP) from Vibrio proteolyticus and contains an inhibitory bacterial prepeptidase C-terminal domain that, when eliminated, increases catalytic efficiency on leucine p-nitroanilide nearly four-fold from 5.4 ± 4.1 × 104 M-1s-1 to 20.3 ± 4.3 × 104 M-1s-1. We demonstrate that LapX processes Lap to its mature form and thus amplifies Lap activity. The increase is approximately eighteen-fold for full-length Lap (95.7 ± 5.6 × 104 M-1s-1) and six-fold for Lap lacking the prepeptidase C-terminal domain (11.3 ± 1.9 × 105 M-1s-1). In addition, substrate profiling reveals preferences for these two proteases that could inform in vivo function. Furthermore, purified LapX and Lap restore the timing of the V. cholerae aggregation program to a mutant lacking the lapX and lap genes. Both proteases must be present to restore WT timing, and thus they appear to act sequentially: LapX acts on Lap, and Lap acts on the substrate involved in aggregation.
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Affiliation(s)
- Tyler C Detomasi
- Department of Chemistry, University of California, Berkeley, Berkeley, California, USA; Department of Pharmaceutical Chemistry, University of California, San Francisco, San Francisco, California, USA
| | - Allison E Batka
- Department of Chemistry, University of California, Berkeley, Berkeley, California, USA
| | - Julie S Valastyan
- Department of Molecular Biology, Princeton University, Princeton, New Jersey, USA; The Howard Hughes Medical Institute, Chevy Chase, Maryland, USA
| | - Molly A Hydorn
- Department of Chemistry, University of California, Berkeley, Berkeley, California, USA; Department of Microbiology and Immunology, College of Physicians and Surgeons, Columbia University, New York, New York, USA
| | - Charles S Craik
- Department of Pharmaceutical Chemistry, University of California, San Francisco, San Francisco, California, USA
| | - Bonnie L Bassler
- Department of Molecular Biology, Princeton University, Princeton, New Jersey, USA; The Howard Hughes Medical Institute, Chevy Chase, Maryland, USA
| | - Michael A Marletta
- Department of Chemistry, University of California, Berkeley, Berkeley, California, USA; California Institute for Quantitative Biosciences, University of California, Berkeley, Berkeley, California, USA; Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, California, USA.
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2
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Sleat DE, Wiseman JA, El-Banna M, Zheng H, Zhao C, Soherwardy A, Moore DF, Lobel P. Analysis of Brain and Cerebrospinal Fluid from Mouse Models of the Three Major Forms of Neuronal Ceroid Lipofuscinosis Reveals Changes in the Lysosomal Proteome. Mol Cell Proteomics 2019; 18:2244-2261. [PMID: 31501224 PMCID: PMC6823856 DOI: 10.1074/mcp.ra119.001587] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Revised: 09/06/2019] [Indexed: 01/06/2023] Open
Abstract
Treatments are emerging for the neuronal ceroid lipofuscinoses (NCLs), a group of similar but genetically distinct lysosomal storage diseases. Clinical ratings scales measure long-term disease progression and response to treatment but clinically useful biomarkers have yet to be identified in these diseases. We have conducted proteomic analyses of brain and cerebrospinal fluid (CSF) from mouse models of the most frequently diagnosed NCL diseases: CLN1 (infantile NCL), CLN2 (classical late infantile NCL) and CLN3 (juvenile NCL). Samples were obtained at different stages of disease progression and proteins quantified using isobaric labeling. In total, 8303 and 4905 proteins were identified from brain and CSF, respectively. We also conduced label-free analyses of brain proteins that contained the mannose 6-phosphate lysosomal targeting modification. In general, we detect few changes at presymptomatic timepoints but later in disease, we detect multiple proteins whose expression is significantly altered in both brain and CSF of CLN1 and CLN2 animals. Many of these proteins are lysosomal in origin or are markers of neuroinflammation, potentially providing clues to underlying pathogenesis and providing promising candidates for further validation.
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Affiliation(s)
- David E Sleat
- Center for Advanced Biotechnology and Medicine, Piscataway, NJ 08854; Department of Biochemistry and Molecular Biology, Robert-Wood Johnson Medical School, Rutgers Biomedical Health Sciences, Piscataway, NJ 08854.
| | | | - Mukarram El-Banna
- Center for Advanced Biotechnology and Medicine, Piscataway, NJ 08854
| | - Haiyan Zheng
- Center for Advanced Biotechnology and Medicine, Piscataway, NJ 08854
| | - Caifeng Zhao
- Center for Advanced Biotechnology and Medicine, Piscataway, NJ 08854
| | - Amenah Soherwardy
- Center for Advanced Biotechnology and Medicine, Piscataway, NJ 08854
| | - Dirk F Moore
- Department of Biostatistics, School of Public Health, Rutgers - The State University of New Jersey, Piscataway, NJ 08854
| | - Peter Lobel
- Center for Advanced Biotechnology and Medicine, Piscataway, NJ 08854; Department of Biochemistry and Molecular Biology, Robert-Wood Johnson Medical School, Rutgers Biomedical Health Sciences, Piscataway, NJ 08854.
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Wenta T, Rychlowski M, Jarzab M, Lipinska B. HtrA4 Protease Promotes Chemotherapeutic-Dependent Cancer Cell Death. Cells 2019; 8:cells8101112. [PMID: 31546993 PMCID: PMC6829446 DOI: 10.3390/cells8101112] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [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: 08/14/2019] [Revised: 09/12/2019] [Accepted: 09/18/2019] [Indexed: 12/26/2022] Open
Abstract
The HtrA4 human protease is crucial in placentation and embryo implantation, and its altered level is connected with pre-eclampsia. The meta-analyses of microarray assays revealed that the HtrA4 level is changed in brain tumors and breast and prostate cancers, which suggests its involvement in oncogenesis. In spite of the HtrA4 involvement in important physiological and pathological processes, its function in the cell is poorly understood. In this work, using lung and breast cancer cell lines, we showed for the first time that the full-length HtrA4 and its N-terminally deleted variant promote cancer cell death induced by chemotherapeutic drugs by enhancing apoptosis. The effect is dependent on the HtrA4 proteolytic activity, and the N-terminally deleted HtrA4 is more efficient in the cell death stimulation. Furthermore, HtrA4 increases the effect of chemotherapeutics on the clonogenic potential and motility of cancer cells, and it increases cell cycle arrest at the G2/M phase. HtrA4 may modulate cell death by degrading the anti-apoptotic XIAP protein and also by proteolysis of the executioner pro-caspase 7 and cytoskeletal proteins, actin and β-tubulin. These findings provide new insight into the mechanism of the HtrA4 protease function in cell death and oncogenesis, and they may help to develop new anti-cancer therapeutic strategies.
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Affiliation(s)
- Tomasz Wenta
- Department of General and Medical Biochemistry, Faculty of Biology, University of Gdansk, Wita Stwosza 59, 80-308 Gdansk, Poland.
| | - Michal Rychlowski
- Laboratory of Virus Molecular Biology, Intercollegiate Faculty of Biotechnology, University of Gdansk and Medical University of Gdansk, Abrahama 58, 80-307 Gdansk, Poland.
| | - Miroslaw Jarzab
- Department of General and Medical Biochemistry, Faculty of Biology, University of Gdansk, Wita Stwosza 59, 80-308 Gdansk, Poland.
| | - Barbara Lipinska
- Department of General and Medical Biochemistry, Faculty of Biology, University of Gdansk, Wita Stwosza 59, 80-308 Gdansk, Poland.
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Lentini G, El Hajj H, Papoin J, Fall G, Pfaff AW, Tawil N, Braun-Breton C, Lebrun M. Characterization of Toxoplasma DegP, a rhoptry serine protease crucial for lethal infection in mice. PLoS One 2017; 12:e0189556. [PMID: 29244879 PMCID: PMC5731766 DOI: 10.1371/journal.pone.0189556] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Accepted: 11/27/2017] [Indexed: 12/14/2022] Open
Abstract
During the infection process, Apicomplexa discharge their secretory organelles called micronemes, rhoptries and dense granules to sustain host cell invasion, intracellular replication and to modulate host cell pathways and immune responses. Herein, we describe the Toxoplasma gondii Deg-like serine protein (TgDegP), a rhoptry protein homologous to High temperature requirement A (HtrA) or Deg-like family of serine proteases. TgDegP undergoes processing in both types I and II strains as most of the rhoptries proteins. We show that genetic disruption of the degP gene does not impact the parasite lytic cycle in vitro but affects virulence in mice. While in a type I strain DegPI appears dispensable for the establishment of an infection, removal of DegPII in a type II strain dramatically impairs the virulence. Finally, we show that KO-DegPII parasites kill immunodeficient mice as efficiently as the wild-type strain indicating that the protease might be involved in the complex crosstalk that the parasite engaged with the host immune response. Thus, this study unravels a novel rhoptry protein in T. gondii important for the establishment of lethal infection.
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Affiliation(s)
- Gaelle Lentini
- UMR 5235 CNRS, Université de Montpellier, Montpellier, France
| | - Hiba El Hajj
- Department of Internal Medicine and Experimental Pathology, Immunology and Microbiology, American University of Beirut, Beirut, Lebanon
| | - Julien Papoin
- UMR 5235 CNRS, Université de Montpellier, Montpellier, France
| | - Gamou Fall
- UMR 5235 CNRS, Université de Montpellier, Montpellier, France
| | - Alexander W. Pfaff
- Institut de Parasitologie et Pathologie Tropicale, EA 7292, Fédération de Médecine Translationnelle, Université de Strasbourg, Strasbourg, France
| | - Nadim Tawil
- Department of Internal Medicine and Experimental Pathology, Immunology and Microbiology, American University of Beirut, Beirut, Lebanon
| | | | - Maryse Lebrun
- UMR 5235 CNRS, Université de Montpellier, Montpellier, France
- * E-mail:
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Homa J, Ortmann W, Kolaczkowska E. Conservative Mechanisms of Extracellular Trap Formation by Annelida Eisenia andrei: Serine Protease Activity Requirement. PLoS One 2016; 11:e0159031. [PMID: 27416067 PMCID: PMC4945018 DOI: 10.1371/journal.pone.0159031] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Accepted: 06/24/2016] [Indexed: 12/30/2022] Open
Abstract
Formation of extracellular traps (ETs) capturing and immobilizing pathogens is now a well-established defense mechanism added to the repertoire of vertebrate phagocytes. These ETs are composed of extracellular DNA (extDNA), histones and antimicrobial proteins. Formation of mouse and human ETs depends on enzymes (i) facilitating decondensation of chromatin by citrullination of histones, and (ii) serine proteases degrading histones. In invertebrates, initial reports revealed existence of ETs composed of extDNA and histones, and here we document for the first time that also coelomocytes, immunocompetent cells of an earthworm Eisenia andrei, cast ETs which successfully trap bacteria in a reactive oxygen species (ROS)-dependent and -independent manner. Importantly, the formation of ETs was observed not only when coelomocytes were studied ex vivo, but also in vivo, directly in the earthworm coelom. These ETs were composed of extDNA, heat shock proteins (HSP27) and H3 histones. Furthermore, the formation of E. andrei ETs depended on activity of serine proteases, including elastase-like activity. Moreover, ETs interconnected and hold together aggregating coelomocytes, a processes proceeding encapsulation. In conclusion, the study confirms ET formation by earthworms, and unravels mechanisms leading to ET formation and encapsulation in invertebrates.
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Affiliation(s)
- Joanna Homa
- Department of Evolutionary Immunology, Institute of Zoology, Jagiellonian University, Gronostajowa 9, 30-387, Krakow, Poland
| | - Weronika Ortmann
- Department of Evolutionary Immunology, Institute of Zoology, Jagiellonian University, Gronostajowa 9, 30-387, Krakow, Poland
| | - Elzbieta Kolaczkowska
- Department of Evolutionary Immunology, Institute of Zoology, Jagiellonian University, Gronostajowa 9, 30-387, Krakow, Poland
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6
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Abstract
Proteinase-activated receptors (PARs) are a family of G protein-coupled receptor that are activated by extracellular cleavage of the receptor in the N-terminal domain. This slicing of the receptor exposes a tethered ligand which binds to a specific docking point on the receptor surface to initiate intracellular signalling. PARs are expressed by numerous tissues in the body, and they are involved in various physiological and pathological processes such as food digestion, tissue remodelling and blood coagulation. This chapter will summarise how serine proteinases activate PARs leading to the development of pain in several chronic pain conditions. The potential of PARs as a drug target for pain relief is also discussed.
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Affiliation(s)
- Jason J McDougall
- Departments of Pharmacology and Anaesthesia, Pain Management and Perioperative Medicine, Dalhousie University, 5850 College Street, Halifax, NS, Canada, B3H 4R2,
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Oulhen N, Xu D, Wessel GM. Conservation of sequence and function in fertilization of the cortical granule serine protease in echinoderms. Biochem Biophys Res Commun 2014; 450:1135-41. [PMID: 24878526 DOI: 10.1016/j.bbrc.2014.05.098] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2014] [Accepted: 05/21/2014] [Indexed: 11/17/2022]
Abstract
Conservation of the cortical granule serine protease during fertilization in echinoderms was tested both functionally in sea stars, and computationally throughout the echinoderm phylum. We find that the inhibitor of serine protease (soybean trypsin inhibitor) effectively blocks proper transition of the sea star fertilization envelope into a protective sperm repellent, whereas inhibitors of the other main types of proteases had no effect. Scanning the transcriptomes of 15 different echinoderm ovaries revealed sequences of high conservation to the originally identified sea urchin cortical serine protease, CGSP1. These conserved sequences contained the catalytic triad necessary for enzymatic activity, and the tandemly repeated LDLr-like repeats. We conclude that the protease involved in the slow block to polyspermy is an essential and conserved element of fertilization in echinoderms, and may provide an important reagent for identification and testing of the cell surface proteins in eggs necessary for sperm binding.
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Affiliation(s)
- Nathalie Oulhen
- Department of Molecular and Cell Biology and Biochemistry, Brown University, 185 Meeting St., Providence, RI 02912, USA
| | - Dongdong Xu
- Department of Molecular and Cell Biology and Biochemistry, Brown University, 185 Meeting St., Providence, RI 02912, USA; Marine Fishery Institute of Zhejiang Province, Key Lab of Mariculture and Enhancement of Zhejiang Province, 316100 Zhoushan, Zhejiang Province, PR China
| | - Gary M Wessel
- Department of Molecular and Cell Biology and Biochemistry, Brown University, 185 Meeting St., Providence, RI 02912, USA.
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Naffin-Olivos JL, Georgieva M, Goldfarb N, Madan-Lala R, Dong L, Bizzell E, Valinetz E, Brandt GS, Yu S, Shabashvili DE, Ringe D, Dunn BM, Petsko GA, Rengarajan J. Mycobacterium tuberculosis Hip1 modulates macrophage responses through proteolysis of GroEL2. PLoS Pathog 2014; 10:e1004132. [PMID: 24830429 PMCID: PMC4022732 DOI: 10.1371/journal.ppat.1004132] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2013] [Accepted: 04/03/2014] [Indexed: 11/29/2022] Open
Abstract
Mycobacterium tuberculosis (Mtb) employs multiple strategies to evade host immune responses and persist within macrophages. We have previously shown that the cell envelope-associated Mtb serine hydrolase, Hip1, prevents robust macrophage activation and dampens host pro-inflammatory responses, allowing Mtb to delay immune detection and accelerate disease progression. We now provide key mechanistic insights into the molecular and biochemical basis of Hip1 function. We establish that Hip1 is a serine protease with activity against protein and peptide substrates. Further, we show that the Mtb GroEL2 protein is a direct substrate of Hip1 protease activity. Cleavage of GroEL2 is specifically inhibited by serine protease inhibitors. We mapped the cleavage site within the N-terminus of GroEL2 and confirmed that this site is required for proteolysis of GroEL2 during Mtb growth. Interestingly, we discovered that Hip1-mediated cleavage of GroEL2 converts the protein from a multimeric to a monomeric form. Moreover, ectopic expression of cleaved GroEL2 monomers into the hip1 mutant complemented the hyperinflammatory phenotype of the hip1 mutant and restored wild type levels of cytokine responses in infected macrophages. Our studies point to Hip1-dependent proteolysis as a novel regulatory mechanism that helps Mtb respond rapidly to changing host immune environments during infection. These findings position Hip1 as an attractive target for inhibition for developing immunomodulatory therapeutics against Mtb.
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Affiliation(s)
- Jacqueline L. Naffin-Olivos
- Rosenstiel Basic Medical Sciences Research Center, Brandeis University, Waltham, Massachusetts, United States of America
| | - Maria Georgieva
- Emory Vaccine Center, Emory University, Atlanta, Georgia, United States of America
| | - Nathan Goldfarb
- Department of Biochemistry and Molecular Biology, University of Florida, Gainesville, Florida, United States of America
| | - Ranjna Madan-Lala
- Emory Vaccine Center, Emory University, Atlanta, Georgia, United States of America
| | - Lauren Dong
- Rosenstiel Basic Medical Sciences Research Center, Brandeis University, Waltham, Massachusetts, United States of America
| | - Erica Bizzell
- Emory Vaccine Center, Emory University, Atlanta, Georgia, United States of America
| | - Ethan Valinetz
- Rosenstiel Basic Medical Sciences Research Center, Brandeis University, Waltham, Massachusetts, United States of America
| | - Gabriel S. Brandt
- Rosenstiel Basic Medical Sciences Research Center, Brandeis University, Waltham, Massachusetts, United States of America
- Franklin and Marshall College, Lancaster, Pennsylvania, United States of America
| | - Sarah Yu
- Department of Biochemistry and Molecular Biology, University of Florida, Gainesville, Florida, United States of America
| | - Daniil E. Shabashvili
- Department of Biochemistry and Molecular Biology, University of Florida, Gainesville, Florida, United States of America
| | - Dagmar Ringe
- Rosenstiel Basic Medical Sciences Research Center, Brandeis University, Waltham, Massachusetts, United States of America
| | - Ben M. Dunn
- Department of Biochemistry and Molecular Biology, University of Florida, Gainesville, Florida, United States of America
| | - Gregory A. Petsko
- Rosenstiel Basic Medical Sciences Research Center, Brandeis University, Waltham, Massachusetts, United States of America
| | - Jyothi Rengarajan
- Emory Vaccine Center, Emory University, Atlanta, Georgia, United States of America
- Division of Infectious Diseases, Department of Medicine, Emory University, Atlanta, Georgia, United States of America
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Du X, Ju C, Hu W. [Progress in researches of molecular mechanism of schistosome cercariae infection]. Zhongguo Xue Xi Chong Bing Fang Zhi Za Zhi 2013; 25:664-667. [PMID: 24490413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Schistosome cercariae must penetrate skin as an initial step to successfully infect the final host. Proteolytic enzymes secreted from the acetabular glands of cercariae contribute significantly to the invasion process. Nowadays, the researches of molecular mechanism of schistosome infection mainly focus on the cercarial secretions including serine protease and cysteine protease. Previous researches already showed that Schistosoma mansoni penetrates the skin mainly depend on cercarial elastease secreted by cercariae while Schistosoma japonicum penetrates the skin chiefly by cathepsin B2. The illustration of molecular mechanism of schistosome cecariae infection will accelerate the identification of novel vaccines and drug targets.
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Affiliation(s)
- Xiaofeng Du
- Department of Microbiology and Microbial Engineering, School of Life Sciences, Fudan University, Shanghai 200433, China
| | - Chuan Ju
- National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention, Key Laboratory of Parasite and Vector Biology of Ministry of Health, WHO Collaborating Center for Malaria, Schistosomiasis and Filariasis, China
| | - Wei Hu
- Department of Microbiology and Microbial Engineering, School of Life Sciences, Fudan University, Shanghai 200433, China
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Kodama J, Hiramatsu Y. [Mechanism of metastasis in cervical cancer]. Nihon Rinsho 2012; 70 Suppl 4:100-103. [PMID: 23156225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Affiliation(s)
- Junichi Kodama
- Department of Obstetrics and Gynecology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences
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LaFlamme BA, Ravi Ram K, Wolfner MF. The Drosophila melanogaster seminal fluid protease "seminase" regulates proteolytic and post-mating reproductive processes. PLoS Genet 2012; 8:e1002435. [PMID: 22253601 PMCID: PMC3257295 DOI: 10.1371/journal.pgen.1002435] [Citation(s) in RCA: 98] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2011] [Accepted: 11/09/2011] [Indexed: 01/05/2023] Open
Abstract
Proteases and protease inhibitors have been identified in the ejaculates of animal taxa ranging from invertebrates to mammals and form a major protein class among Drosophila melanogaster seminal fluid proteins (SFPs). Other than a single protease cascade in mammals that regulates seminal clot liquefaction, no proteolytic cascades (i.e. pathways with at least two proteases acting in sequence) have been identified in seminal fluids. In Drosophila, SFPs are transferred to females during mating and, together with sperm, are necessary for the many post-mating responses elicited in females. Though several SFPs are proteolytically cleaved either during or after mating, virtually nothing is known about the proteases involved in these cleavage events or the physiological consequences of proteolytic activity in the seminal fluid on the female. Here, we present evidence that a protease cascade acts in the seminal fluid of Drosophila during and after mating. Using RNAi to knock down expression of the SFP CG10586, a predicted serine protease, we show that it acts upstream of the SFP CG11864, a predicted astacin protease, to process SFPs involved in ovulation and sperm entry into storage. We also show that knockdown of CG10586 leads to lower levels of egg laying, higher rates of sexual receptivity to subsequent males, and abnormal sperm usage patterns, processes that are independent of CG11864. The long-term phenotypes of females mated to CG10586 knockdown males are similar to those of females that fail to store sex peptide, an important elicitor of long-term post-mating responses, and indicate a role for CG10586 in regulating sex peptide. These results point to an important role for proteolysis among insect SFPs and suggest that protease cascades may be a mechanism for precise temporal regulation of multiple post-mating responses in females. Proteases can destroy, activate, or otherwise modulate the function of other proteins. In seminal fluid, many proteins have to be activated or degraded after mating; proteolysis is an effective way to accomplish this because seminal fluid proteins act outside of the cell, where most other regulatory processes cannot be used. Despite the presence of proteases in the seminal fluid of many animals, nearly nothing is known about the kinds of processes they regulate. Here, we present evidence of a protease cascade in the seminal fluid of the fruit fly Drosophila melanogaster. This cascade involves two proteases that are activated during mating. Once in the female, the downstream protease acts on two other proteins that are important for ovulation and sperm storage. Interestingly, the protease at the top of the cascade, CG10586, is also required for other female post-mating responses, including egg laying and sperm usage, independent of the second protease. Thus, CG10586 might be a general regulatory switch used by the male to quickly activate many female responses after mating.
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Affiliation(s)
- Brooke A. LaFlamme
- Department of Molecular Biology and Genetics, Cornell University, Ithaca, New York, United States of America
| | - K. Ravi Ram
- Department of Molecular Biology and Genetics, Cornell University, Ithaca, New York, United States of America
- Embryotoxicology Division, Council of Scientific and Industrial Research–Indian Institute of Toxicology Research, Lucknow, India
| | - Mariana F. Wolfner
- Department of Molecular Biology and Genetics, Cornell University, Ithaca, New York, United States of America
- * E-mail:
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12
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Zizzi A, Aspriello SD, Rubini C, Goteri G. Peri-implant diseases and host inflammatory response involving mast cells: a review. Int J Immunopathol Pharmacol 2011; 24:557-66. [PMID: 21978688 DOI: 10.1177/039463201102400302] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Mast cells (MCs) are motile granule-containing cells that originate from bone marrow pluripotential haematopoietic cells, circulate in blood and extravasate in tissues where they play an important role in inflammation, host defense and tissue repair. We herein review the English literature over the past twenty years concerning the biology and function of MCs with particular focus on their role in the inflammatory process in dental implant failure due to osseointegration absence or to peri-implantitis. Due to immunological or non-immunological stimulation, in a few minutes MCs release prestored granule-associated mediators into the extracellular environment promoting pro-/anti-inflammatory events/response. MCs can either protect the host by activating defense mechanisms and initiating tissue repair and osseointegration if their function is transient, or lead to considerable tissue damage if it is inappropriate and continuous leading to osseointegration absence or peri-implantitis. We hypothesize that administration of histamine receptor antagonists, serine protease inhibitors and MC preformed mediator release inhibitors before and after implantation could represent novel therapeutic strategies to improve the osseointegration, the functionality and longevity of implants or prevent and treat peri-implant inflammatory conditions.
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13
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Vera IM, Beatty WL, Sinnis P, Kim K. Plasmodium protease ROM1 is important for proper formation of the parasitophorous vacuole. PLoS Pathog 2011; 7:e1002197. [PMID: 21909259 PMCID: PMC3164628 DOI: 10.1371/journal.ppat.1002197] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2010] [Accepted: 06/22/2011] [Indexed: 11/18/2022] Open
Abstract
Apicomplexans are obligate intracellular parasites that invade host cells by an active process leading to the formation of a non-fusogenic parasitophorous vacuole (PV) where the parasite replicates within the host cell. The rhomboid family of proteases cleaves substrates within their transmembrane domains and has been implicated in the invasion process. Although its exact function is unknown, Plasmodium ROM1 is hypothesized to play a role during invasion based on its microneme localization and its ability to cleave essential invasion adhesins. Using the rodent malaria model, Plasmodium yoelii, we carried out detailed quantitative analysis of pyrom1 deficient parasites during the Plasmodium lifecycle. Pyrom1(-) parasites are attenuated during erythrocytic and hepatic stages but progress normally through the mosquito vector with normal counts of oocyst and salivary gland sporozoites. Pyrom1 steady state mRNA levels are upregulated 20-fold in salivary gland sporozoites compared to blood stages. We show that pyrom1(-) sporozoites are capable of gliding motility and traversing host cells normally. Wildtype and pyrom1(-) sporozoites do not differ in the rate of entry into Hepa1–6 hepatocytes. Within the first twelve hours of hepatic development, however, only 50% pyrom1(-) parasites have developed into exoerythrocytic forms. Immunofluorescence microscopy using the PVM marker UIS4 and transmission electron microscopy reveal that the PV of a significant fraction of pyrom1(-) parasites are morphologically aberrant shortly after invasion. We propose a novel function for PyROM1 as a protease that promotes proper PV modification to allow parasite development and replication in a suitable environment within the mammalian host. Plasmodium parasites are obligate intracellular organisms that invade cells by an active mechanism mediated by the secretion of contents from specialized secretory organelles, the micronemes and rhoptries. Invaded parasites reside and replicate within a membrane-bound compartment called the parasitophorous vacuole (PV). PV formation is exclusive to development within mammalian specific host cells, the erythrocytes and hepatocytes. Proper modification of the PV is important to protect the parasite from host defenses and to serve as a gateway for nutrient acquisition and communication with the environment. The rhomboid proteins, a class of intramembrane serine proteases, are implicated in the invasion process. We studied the microneme rhomboid protease, ROM1 in the rodent malaria parasite, Plasmodium yoelii. We find that pyROM1 is not important for efficient invasion into host cells and instead is important for survival within the host cells. Analysis of parasites developing within hepatocytes reveals a defect in PV development. We propose that pyROM1 provides a fitness advantage to parasites developing within host cells by promoting the proper modification of the PV.
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Affiliation(s)
- Iset Medina Vera
- Departments of Medicine and of Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, New York, United States of America
| | - Wandy L. Beatty
- Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri, United States of America
| | - Photini Sinnis
- Department of Microbiology, New York University Langone School of Medicine, New York, New York, United States of America
| | - Kami Kim
- Departments of Medicine and of Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, New York, United States of America
- * E-mail:
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Bai L, Charvin G. [Nucleosome-depleted regions in promoters: consequences on robustness of transcriptional activation]. Med Sci (Paris) 2010; 26:1035-7. [PMID: 21187039 DOI: 10.1051/medsci/201026121035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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15
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McGreal EP, Davies PL, Powell W, Rose-John S, Spiller OB, Doull I, Jones SA, Kotecha S. Inactivation of IL-6 and soluble IL-6 receptor by neutrophil derived serine proteases in cystic fibrosis. Biochim Biophys Acta Mol Basis Dis 2010; 1802:649-58. [PMID: 20438838 DOI: 10.1016/j.bbadis.2010.04.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2010] [Revised: 04/01/2010] [Accepted: 04/19/2010] [Indexed: 01/01/2023]
Abstract
The ability of IL-6 to signal via both membrane bound and soluble receptors is thought to explain the capacity of this cytokine to act in both the initiation and resolution of acute inflammatory responses. In cystic fibrosis (CF), poorly resolved neutrophillic inflammation of the lungs is a primary cause of morbidity and mortality. Expression of IL-6 has been reported to be low in CF lung secretions, despite ongoing inflammation, but the status of soluble IL-6 receptor (sIL-6R) in these patients is unknown. We hypothesised that sIL-6R may be an important potentiator of IL-6 activity in CF associated lung disease. IL-6, sIL-6R and sgp130 (a natural antagonist of responses mediated by the sIL-6R) were analysed by ELISA and Western blot in bronchoalveolar lavage fluid (BALF) from 28 paediatric CF patients and nine non-CF controls. Total cell counts in CF were four fold higher compared to controls (median: 1.4 x 10(6) cells/ml v. 0.35 x 10(6) cells/ml in controls) (p<0.001) and the infiltrate was dominated by neutrophils which were elevated by 89 fold (0.62 x 10(6) cells/ml v. 0.007 x 10(6) cells/ml in controls) (p<0.001). Other markers of inflammation such as IL-8 and MCP-1 were elevated 17.5 and 3.8 fold respectively (IL-8; median: 1122 pg/ml v. 64 pg/ml in controls, p<0.01 and MCP-1; median: 692 pg/ml v. 182 pg/ml in controls, p<0.05). IL-6, although present in 23/32 CF BALF specimens compared to 1/9 controls (p<0.01), was weakly expressed (median: 50 pg/ml). Expression of sIL-6R and sgp130 in CF was no different to control patients. We tested whether weak expression of all three molecules was due to degradation by CF BALF. Degradative activity was observed in association with BALF elastase activity and could be specifically blocked by serine protease inhibitors. Degradation of sIL-6R by purified serine proteases (elastase, cathepsin G and proteinase 3) was also observed leading to a loss of trans-signalling activity. Interestingly, sIL-6R was protected from proteolysis by interaction with IL-6. Our data identify and define a novel protease mediated deficiency of IL-6 signalling in the CF lung.
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Affiliation(s)
- Eamon P McGreal
- Department of Child Health, Cardiff University School of Medicine, Heath Park, Cardiff CF14 4XN, UK.
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Kondashevskaia MV. [Modern views of the role of heparin in hemostasis and regulation of enzymatic and hormonal activities]. Vestn Ross Akad Med Nauk 2010:35-43. [PMID: 20795401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
This review is focused on the role of heparin in the maintenance of hematological homeostasis. Description of the main components of the hemostatic system is presented. The mechanism of heparin action as an anticoagulating and fibrinolytic agent are analyzed. A hypothesis is forwarded to explain the role of heparin in animals and humans as a key substance promoting stabilization, regulation and distribution of different active blood components bound into complexes with heparin.
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Kobori H. [Intrarenal mechanisms of angiotensin II formation]. Nihon Jinzo Gakkai Shi 2010; 52:92-100. [PMID: 20415227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
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