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Cai B, Song W, Chen S, Sun J, Zhou R, Han Z, Wan J. Bone Mesenchymal Stem Cell-Derived Small Extracellular Vesicles Ameliorated Lipopolysaccharide-Induced Lung Injury Via the miR-21-5p/PCSK6 Pathway. J Immunol Res 2023; 2023:3291137. [PMID: 37937296 PMCID: PMC10626970 DOI: 10.1155/2023/3291137] [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] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Revised: 09/18/2023] [Accepted: 09/28/2023] [Indexed: 11/09/2023] Open
Abstract
Acute lung injury (ALI) is a life-threatening disease that currently lacks a cure. Although stem cell-derived small extracellular vesicles (sEVs) have shown promising effects in the treatment of ALI, their underlying mechanisms and responsible components have yet to be identified. Proprotein convertase subtilisin/kexin type 6 (PCSK6) is a gene involved in inflammation and a potential target of miR-21-5p, a microRNA enriched in stem cell-derived sEVs. The current study investigated the role of PCSK6 in lipopolysaccharide (LPS)-induced ALI and its interaction with miR-21-5p. Notably, our results showed that PCSK6 expression was positively correlated with LPS stimulation. Knockdown of PCSK6 ameliorated LPS-induced inhibition of proliferation and upregulation of permeability in human BEAS-2B cells, whereas PCSK6 overexpression displayed the opposite effects. BEAS-2B cells were able to actively internalize the cocultured bone mesenchymal stem cell (MSC)-derived sEVs (BMSC-sEVs), which alleviated the cell damage caused by LPS. Overexpressing PCSK6, however, eliminated the therapeutic effects of BMSC-sEV coculture. Mechanistically, BMSC-sEVs inhibited PCSK6 expression via the delivery of miR-21-5p, which is directly bound to the PCSK6 gene. Our work provides evidence for the role of PCSK6 in LPS-induced ALI and identified miR-21-5p as a component of BMSC-derived sEVs that suppressed PCSK6 expression and ameliorated LPS-induced cell damage. These results reveal a novel molecular mechanism for ALI pathogenesis and highlight the therapeutic potential of using sEVs released by stem cells to deliver miR-21-5p for ALI treatment.
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Affiliation(s)
- Bo Cai
- Department of Emergency and Critical Care Medicine, Shanghai Pudong New Area People's Hospital, No. 490 Chuansha South Road, Pudong New Area, 201299, Shanghai, China
| | - Weidong Song
- Department of Emergency and Critical Care Medicine, Shanghai Pudong New Area People's Hospital, No. 490 Chuansha South Road, Pudong New Area, 201299, Shanghai, China
| | - Song Chen
- Department of Emergency and Critical Care Medicine, Shanghai Pudong New Area People's Hospital, No. 490 Chuansha South Road, Pudong New Area, 201299, Shanghai, China
| | - Jie Sun
- Department of Emergency and Critical Care Medicine, Shanghai Pudong New Area People's Hospital, No. 490 Chuansha South Road, Pudong New Area, 201299, Shanghai, China
| | - Rui Zhou
- Department of Emergency and Critical Care Medicine, Shanghai Pudong New Area People's Hospital, No. 490 Chuansha South Road, Pudong New Area, 201299, Shanghai, China
| | - Zhen Han
- Department of Emergency and Critical Care Medicine, Shanghai Pudong New Area People's Hospital, No. 490 Chuansha South Road, Pudong New Area, 201299, Shanghai, China
| | - Jian Wan
- Department of Emergency and Critical Care Medicine, Shanghai Pudong New Area People's Hospital, No. 490 Chuansha South Road, Pudong New Area, 201299, Shanghai, China
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Brockmann C, Brockmann T, Dege S, Busch C, Kociok N, Vater A, Klussmann S, Strauß O, Joussen AM. Intravitreal inhibition of complement C5a reduces choroidal neovascularization in mice. Graefes Arch Clin Exp Ophthalmol 2015; 253:1695-704. [PMID: 25981118 DOI: 10.1007/s00417-015-3041-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2014] [Revised: 02/20/2015] [Accepted: 04/29/2015] [Indexed: 12/12/2022] Open
Abstract
PURPOSE To investigate the influence of complement component C5a inhibition on laser-induced choroidal neovascularization (CNV) in mice using a C5a specific L-aptamer. METHODS In C57BL/6 J mice CNV was induced by argon-laser, C5a-inhibitor (NOX-D20) was intravitreally injected in three concentrations: 0.3, 3.0, and 30 mg/ml. The unPEGylated derivate (NOX-D20001) was applied at 3.0 mg/ml; the vehicle (5 % glucose) was injected in controls. Vascular leakage was evaluated using fluorescence angiography, CNV area was examined immunohistochemically. Activated immune cells surrounding the CNV lesion and potential cytotoxicity were analyzed. RESULTS Compared to controls, CNV areas were significantly reduced after NOX-D20 injection at a concentration of 0.3 and 3.0 mg/ml (p = 0.042; p = 0.016). NOX-D20001 significantly decreased CNV leakage but not the area (p = 0.007; p = 0.276). At a concentration of 30 mg/ml, NOX-D20 did not reveal significant effects on vascular leakage or CNV area (p = 0.624; p = 0.121). The amount of CD11b positive cells was significantly reduced after treatment with 0.3 and 3.0 mg/ml NOX-D20 (p = 0.027; p = 0.002). No adverse glial cell proliferation or increased apoptosis were observed at effective dosages. CONCLUSIONS Our findings demonstrate that the targeted inhibition of complement component C5a reduces vascular leakage and neovascular area in laser-induced CNV in mice. NOX-D20 was proven to be an effective and safe agent that might be considered as a therapeutic candidate for CNV treatment. The deficiency of activated immune cells highlights promising new aspects in the pathology of choroidal neovascularization, and warrants further investigations.
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Affiliation(s)
- Claudia Brockmann
- Department of Ophthalmology, Charité - University Medicine Berlin, Augustenburger Platz 1, 13353, Berlin, Germany.
| | - Tobias Brockmann
- Department of Ophthalmology, Charité - University Medicine Berlin, Augustenburger Platz 1, 13353, Berlin, Germany
| | - Sabrina Dege
- Department of Ophthalmology, Charité - University Medicine Berlin, Augustenburger Platz 1, 13353, Berlin, Germany
| | - Catharina Busch
- Department of Ophthalmology, Charité - University Medicine Berlin, Augustenburger Platz 1, 13353, Berlin, Germany
| | - Norbert Kociok
- Department of Ophthalmology, Charité - University Medicine Berlin, Augustenburger Platz 1, 13353, Berlin, Germany
| | - Axel Vater
- NOXXON Pharma AG, Max-Dohrn-Strasse 8-10, 10589, Berlin, Germany
| | - Sven Klussmann
- NOXXON Pharma AG, Max-Dohrn-Strasse 8-10, 10589, Berlin, Germany
| | - Olaf Strauß
- Department of Ophthalmology, Charité - University Medicine Berlin, Augustenburger Platz 1, 13353, Berlin, Germany
| | - Antonia M Joussen
- Department of Ophthalmology, Charité - University Medicine Berlin, Augustenburger Platz 1, 13353, Berlin, Germany
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Brennen WN, Rosen DM, Chaux A, Netto GJ, Isaacs JT, Denmeade SR. Pharmacokinetics and toxicology of a fibroblast activation protein (FAP)-activated prodrug in murine xenograft models of human cancer. Prostate 2014; 74:1308-19. [PMID: 25053236 PMCID: PMC4130904 DOI: 10.1002/pros.22847] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/15/2014] [Accepted: 06/04/2014] [Indexed: 01/18/2023]
Abstract
BACKGROUND As carcinoma progresses, the stroma undergoes a variety of phenotypic changes, including the presence of carcinoma-associated fibroblasts (CAFs) that express fibroblast activation protein (FAP). FAP is a post-prolyl endopeptidase whose expression in a healthy adult is largely restricted to the cancer-associated stroma. FAP-targeted prodrugs with a 100-fold greater therapeutic window over the parent compound were previously generated. METHODS Prodrugs and non-cleavable controls were incubated in the presence of FAP. Plasma and tumor half-lives (t1/2) of the full-length and active forms of the prodrugs were determined using LCMS. Biodistribution studies of prodrug activation were performed. Histopathological analysis of tissues from treated animals were compared to vehicle-treated controls. Toxicity and efficacy studies were performed in human breast (MDA-MB-231 and MCF-7) and prostate (LNCaP) cancer xenografts models. RESULTS These FAP-activated prodrugs have a significantly slower clearance from tumor tissue than the circulation (∼12 vs. ∼4.5 hr). Micromolar concentrations of active drug persist in the tumor. Active drug is detected in non-target tissues; however, histopathologic evaluation reveals no evidence of drug-induced toxicity. A FAP-activated prodrug (ERGETGP-S12ADT) inhibits tumor growth in multiple human breast and prostate cancer xenograft models. The anti-tumor effect is comparable to that observed with docetaxel, but results in significantly less toxicity. CONCLUSION FAP-activated prodrugs are a viable strategy for the management of prostate and other cancers. These prodrugs exhibit less toxicity than a commonly used chemotherapeutic agent. Further refinement of the FAP cleavage site for greater specificity may reduce prodrug activation in non-target tissues and enhance clinical benefit.
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Affiliation(s)
- W. Nathaniel Brennen
- Chemical Therapeutics Program, The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, The Johns Hopkins University School of Medicine, Baltimore, MD 21287
- Department of Oncology, The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, The Johns Hopkins University School of Medicine, Baltimore, MD 21287
| | - D. Marc Rosen
- Chemical Therapeutics Program, The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, The Johns Hopkins University School of Medicine, Baltimore, MD 21287
- Department of Oncology, The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, The Johns Hopkins University School of Medicine, Baltimore, MD 21287
| | - Alcides Chaux
- Department of Oncology, The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, The Johns Hopkins University School of Medicine, Baltimore, MD 21287
- Department of Pathology, The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, The Johns Hopkins University School of Medicine, Baltimore, MD 21287
| | - George J. Netto
- Department of Oncology, The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, The Johns Hopkins University School of Medicine, Baltimore, MD 21287
- Department of Pathology, The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, The Johns Hopkins University School of Medicine, Baltimore, MD 21287
| | - John T. Isaacs
- Chemical Therapeutics Program, The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, The Johns Hopkins University School of Medicine, Baltimore, MD 21287
- Department of Oncology, The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, The Johns Hopkins University School of Medicine, Baltimore, MD 21287
| | - Samuel R. Denmeade
- Chemical Therapeutics Program, The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, The Johns Hopkins University School of Medicine, Baltimore, MD 21287
- Department of Oncology, The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, The Johns Hopkins University School of Medicine, Baltimore, MD 21287
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Abstract
BACKGROUND Airborne enzymes behave as potent respiratory allergens. Till date, allergic disorders caused by genetically engineered enzymes widely used in the industry, have not been reported. RESULTS AND CONCLUSIONS We describe a worker employed in the detergent industry who developed asthma and rhinitis from IgE-mediated sensitization to the thermostable endo-alpha-amylase Termamyl® and to the protease Savinase®. This is the first report showing that Termamyl® elicits allergic respiratory disorders in humans.
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Affiliation(s)
- Xaver Baur
- Institute for Occupational and Maritime Medicine, University Medical Centre Hamburg Eppendorf, Hamburg, Germany.
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Zhang Z, Li Q, Fan J. [Biological significance of IgA1 proteases]. Sheng Wu Yi Xue Gong Cheng Xue Za Zhi 2011; 28:423-428. [PMID: 21604515] [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: 05/30/2023]
Abstract
The IgA1 proteases are a group of proteolytic enzymes, which are produced by pathogenic bacteria that infect and colonize mucosal surfaces. This group of proteolytic enzymes was found to cleave specific peptide bonds within the sequence TPPTPSPSTPPTPSPS (T, P and S are threonine, proline and serine residues, respectively) found in the hinge region of human IgA1. Several findings support the role of IgA1 protease, for example, its ability to cleave human LAMP1 (hLAMP1), TNF-RII, the CD8 molecule of T lymphocytes and granulocyte-macrophage colony-stimulating factor (GM-CSF), synaptobrevin II, hormone human chorionic gonadotropin, and its ability to exhibit important immunomodulatory properties, etc. , in particular the induction of proinflammatory cytokines. The IgA1 proteases have been found to instigate part of the T cell inflammatory response, especially to stimulate the release of cytokines such as tumour necrosis factor alpha (TNF-alpha), interleukin-1beta (IL-1beta), interleukin-6 (IL-6), and interleukin-8 (IL-8). All these suggest that this enzyme plays a significant role in pathogenesis. There are many other researches to explore new biological treatments of diseases using the biological characteristics of IgA1 protease.
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Affiliation(s)
- Ziyuan Zhang
- Department of Nephrology, West China Hospital, Sichuan University, Chengdu 610041, China
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McDade J, Aygun B, Ware RE. Brown recluse spider (Loxosceles reclusa) envenomation leading to acute hemolytic anemia in six adolescents. J Pediatr 2010; 156:155-7. [PMID: 20006769 PMCID: PMC4902007 DOI: 10.1016/j.jpeds.2009.07.021] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2009] [Revised: 06/02/2009] [Accepted: 07/08/2009] [Indexed: 11/29/2022]
Abstract
Loxosceles reclusa (brown recluse spider) bites often cause local envenomation reactions; however, acute hemolysis from systemic loxoscelism is rare. To highlight this important diagnostic consideration for unexplained hemolysis in areas endemic for brown recluse spiders, we report on 6 adolescents with acute hemolytic anemia from presumed L reclusa bites.
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Affiliation(s)
- Jenny McDade
- Department of Hematology, St. Jude Children's Research Hospital, Memphis, TN, USA
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Abstract
This study is aimed at setting occupational exposure levels for total detergent dust and enzymes in detergent industries. The study population consisted of 795 workers from four enzyme-containing detergent manufacturing plants (A1, A2, B1 and B2), and 156 control workers from an electronic assembly factory. Work environment monitoring was conducted using high volume of air sampler fro measuring the concentration of total dust (mg/m3), and analyzing the level of enzyme (ng/m3) by ELISA method. A standard questionnaires, pulmonary function test, and skin prick test are used to assess health effects. The levels of detergent total dust varied from 0.2 mg/m3 to 12.54 mg/m3. For enzyme levels, in A1, B1 and B2, the concentration ranged from non-detectable to 9.92 ng/m3 and in A2, the concentration was analyzed by enzyme activity methods and was expressed as Gu/m3 (1 Gu/m3 = 16 ng/m3). The concentration is between 0.16-31.36 ng/m3. Non-specific irritation rates in exposed workers were significantly higher than that in controls. Based on the data collected from A1, B1 and control plants, 95% benchmark dose lower bound were calculated as 1.17 mg/m3. The difference of pulmonary function between exposed workers and controls is not significant. The results of SPT showed that neither Savinase- nor Alcalase-induced sensitization was found in controls. The prevalence rates of sensitization for Savinase and Alcalase were ranged between 3.2% and 31% in all enzyme-containing detergent manufacturers investigated. No case of occupational asthma was observed. For total dust, 1 mg/m3 is suggested as permissible concentration-time weighted average (PC-TWA), and 2 mg/m3 as permissible concentration-short term exposure limit (PC-STEL). For the enzyme Subtilisins, 15 ng/m3 is suggested as PC-TWA, and 30 ng/m3 as PC-STEL.
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Affiliation(s)
- X D Zhang
- School of Public Health Fudan University, Shanghai, PR China
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Hara T, Nakayama Y, Nara N. [Regenerative medicine of skeletal muscle]. Rinsho Shinkeigaku 2005; 45:880-2. [PMID: 16447752] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
In the dystrophin-deficient mdx mice, an animal model of Duchenne muscular dystrophy (DMD), damaged skeletal muscles are efficiently regenerated and thus the animals thrive. The phenotypic differences between DMD patients and mdx mice suggest the existence of factors that modulate the muscle wasting in the mdx mice. To identify these factors, we searched for mRNAs affected by the mdx mutation using cDNA microarrays with newly established skeletal muscle cell lines derived from mdx and normal mice. We found that genes encoding thymosin beta4, frizzled related protein 2 (FRP2), and regeneration-associated muscle protease (RAMP) are up-regulated in skeletal muscle of mdx mice. Thymosin beta4 was induced in both regenerating muscle fibers and inflammatory cells after muscle injury. It stimulated migration and chemotaxis of myoblasts. FRP2 was dramatically induced upon muscle injury. RNA interference-mediated knockdown of FRP2 mRNA in myoblasts resulted in a massive cell death. Thus FRP2 may enhance the survival rate of myoblasts in the regenerative regions. RAMP mRNA was specifically induced in the regenerating areas of injured skeletal muscle. Expression of RAMP and FRP2 was much lower in individual muscle cell lines derived from biopsy specimens from several DMD patients compared to in a normal muscle cell line. Above results suggest that thymosin beta4, FRP2, and RAMP may play roles in the regeneration of skeletal muscle and that down-regulation of these molecules could be involved in the progression of DMD in humans.
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Affiliation(s)
- Takahiko Hara
- Tokyo Metropolitan Organization for Medical Research, The Tokyo Metropolitan Institute of Medical Science, Department of Tumor Biochemistry
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Montealegre F, Fernández B, Delgado A, Fernández L, Román A, Chardón D, Rodríguez-Santana J, Medina V, Zavala D, Bayona M. Exposure levels of asthmatic children to allergens, endotoxins, and serine proteases in a tropical environment. J Asthma 2004; 41:485-96. [PMID: 15281335 DOI: 10.1081/jas-120033993] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
A cross-sectional study was conducted in Bayamón, Puerto Rico, to identify and quantify indoor allergens, serine proteases, and bacterial endotoxin present in homes of asthmatic children. A total of 126 dust samples from houses were obtained from the entire mattress and bedside floor. Most of the patients had detectable levels of mite, cockroach, cat, and dog allergens. Mold allergens were found only in bedside floor dust samples. Mouse allergens were not detected. Forty-two percent, 36.5%, and 1.8% of the patients demonstrated exposures to sensitizing levels of mite, Bla g 1 and cat allergens, respectively. The percentage of patients exposed to high levels of allergens capable of triggering asthma symptoms was 33.3% and 26.4% for mite and Bla g 1 allergens. Only dog allergen, bacterial endotoxin, elastase, and trypsin were associated with asthma symptoms. Eighty-nine percent of the asthmatic children were exposed to endotoxin concentrations greater than 100 EU/mg dust, and more than half of the patients were exposed to high levels of serine proteases. Our study indicates that indoor concentrations of allergens traditionally associated with asthma symptoms and severity may not be applicable in tropical environments and highly ventilated households. In fact, in the study population, endotoxins, dog allergen, and serine proteases may play a dominant role in the induction of asthma symptoms.
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Lawrence CE, Paterson YYW, Wright SH, Knight PA, Miller HRP. Mouse mast cell protease-1 is required for the enteropathy induced by gastrointestinal helminth infection in the mouse. Gastroenterology 2004; 127:155-65. [PMID: 15236182 DOI: 10.1053/j.gastro.2004.04.004] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
BACKGROUND & AIMS The relationship between intestinal pathology and immune expulsion of gastrointestinal nematodes remains controversial. Immune expulsion of gastrointestinal helminth parasites is usually associated with Th2 responses, but the effector mechanisms directly responsible for parasite loss have not been elucidated. Mast cell hyperplasia is a hallmark of infection with gastrointestinal nematodes, in particular Trichinella spiralis. Although the precise mechanism by which mast cells induce expulsion of these parasites has not been elucidated, it has been proposed that mast cell mediators, including cytokines and granule chymases, act to create an environment inhospitable to the parasite, part of this being the induction of intestinal inflammation. Therefore, the aims of this study were to dissect the role of mast cells and mast cell proteases in the induction of parasite-induced enteropathy. METHODS Mast cell-deficient W/Wv and mouse mast cell protease-1 (mMCP-1)-deficient mice were infected with T. spiralis, and parasite expulsion, enteropathy, and Th2 responses were determined. RESULTS Expulsion of the parasite was delayed in both strains of mice compared with wild-type controls; additionally, in both cases, the enteropathy was significantly ameliorated. Although Th2 responses were significantly reduced in mast cell-deficient W/Wv mice, those from mMCP-1-deficient mice were similar to wild-type mice. Additionally, levels of TNF-alpha and nitric oxide were significantly reduced in both W/Wv and mMCP-1 deficient mice. CONCLUSIONS These results imply that mast cells may contribute to the induction of protective Th2 responses and, importantly, that the intestinal inflammation associated with gastrointestinal helminths is partly mediated by mMCP-1.
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Affiliation(s)
- Catherine E Lawrence
- Department of Immunology, SIBS, Strathclyde University, Glasgow, United Kingdom. catherine.lawrence@strath
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Zannin M, Lourenço DM, Motta G, Dalla Costa LR, Grando M, Gamborgi GP, Noguti MA, Chudzinski-Tavassi AM. Blood coagulation and fibrinolytic factors in 105 patients with hemorrhagic syndrome caused by accidental contact with Lonomia obliqua caterpillar in Santa Catarina, southern Brazil. Thromb Haemost 2003; 89:355-64. [PMID: 12574817] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
Haemostatic disorders caused by Lonomia obliqua caterpillars has reached epidemic proportions in southern Brazil. Here we evaluated coagulation and fibrinolysis in 105 patients after accidental contact with Lonomia obliqua caterpillars. Global coagulation tests were prolonged in most cases and patients were divided into 3 groups according to fibrinogen (Fg) level: <or=0.5 g/l (group A); 0.51-1.5 g/l (group B), >1.5 g/l (group C). There was a significant reduction of factors V, XIII, VIII and prekallikrein in group A, with no change in factors X, II and von Willebrand factor. Thrombin-antithrombin and prothrombin F1+2 were elevated in most patients. Antithrombin and protein S were not changed whereas protein C levels were reduced in group A. Plasminogen and alfa2-antiplasmin levels were significantly reduced in group A and D-Dimer levels were extremely high in all groups, showing that fibrinolysis had been activated, possibly secondary to fibrin production. Levels of t-PA were normal and PAI-1 was mildly elevated in group A. The platelet count remained above 150 x 109 platelets/ml in 97% of cases. In summary, our results suggest that Lonomia obliqua envenoming is characterized by a consumption coagulopathy and secondary fibrinolysis.
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Affiliation(s)
- Marlene Zannin
- Department of Pathology and Toxicology UFSC Florianópolis SC
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Brown JK, Jones CA, Rooney LA, Caughey GH. Mast cell tryptase activates extracellular-regulated kinases (p44/p42) in airway smooth-muscle cells: importance of proteolytic events, time course, and role in mediating mitogenesis. Am J Respir Cell Mol Biol 2001; 24:146-54. [PMID: 11159048 DOI: 10.1165/ajrcmb.24.2.4165] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
We previously reported that mast cell tryptase is a potent mitogen for cultured airway smooth-muscle cells, but the early intracellular signals mediating this response are not known. In many cells, proliferative effects are mediated by a mitogen-activated protein kinase signaling pathway involving Raf-1, MAP kinase kinases (MEKs), and extracellular signal-regulated protein kinases (ERKs) 1 and 2. Therefore, we tested for tryptase-induced activation of ERK1 and 2 in cultured dog tracheal smooth-muscle cells. Tryptase, in nanomolar concentrations which potently stimulated DNA synthesis, increased dual phosphorylation of ERKs in cellular lysates as well as ERK2 kinase activity in immunoprecipitates. Pretreatment of cells with the MEK inhibitor PD098059 abolished tryptase-induced increases in DNA synthesis and attenuated increases in ERK2 activity. Irreversible inhibition of tryptase's proteolytic activity, using p-amidino phenylmethanesulfonyl fluoride, attenuated tryptase-induced increases in DNA synthesis and dual phosphorylation of ERKs by 76% and 40 to 60%, respectively. Tryptase also increased c-fos transcription as quantified in polymerase chain reactions. In concentrations that caused similar increases in DNA synthesis, tryptase and platelet-derived growth factor (PDGF-BB) increased ERK activity (and c-fos transcription) with markedly different kinetics, the tryptase-induced responses being slower in onset and more sustained. We conclude that tryptase-induced mitogenesis in airway smooth-muscle cells requires activation of ERK1 and 2; that these responses depend partially, but not completely, upon tryptase's properties as a protease; and that they are slower in onset and more sustained than those induced by PDGF-BB.
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Affiliation(s)
- J K Brown
- Pulmonary and Critical Care Medicine Section (111-D), Department of Veterans Affairs Medical Center, 4150 Clement St., San Francisco, CA 94121, USA.
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Abstract
Penicillium and Aspergillus species have been identified as prevalent indoor airborne fungi that are associated with extrinsic bronchial asthma. We have recently analyzed the IgE-binding components in 8 prevalent Penicillium and Aspergillus species (P. citrinum, P. notatum, P. oxalicum, P. brevicompactum, A. fumigatus, A. flavus, A. oryzae and A. niger) by immunoblotting and N-terminal amino acid sequence analysis. Our results show that the alkaline and/or vacuolar serine proteinases are the major allergens in these prevalent fungal species. IgE cross-reactivity among these major allergens was also detected. Results obtained provide an important basis for clinical allergy. In addition, monoclonal antibodies against alkaline and/or vacuolar serine proteinase allergens have been generated. These antibodies can be applied for the standardization of allergenic extracts.
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Affiliation(s)
- H D Shen
- Department of Medical Research, Veterans General Hospital-Taipei, Taipei, Taiwan, Republic of China.
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Marrakchi N, el Ayeb M. [Thrombin-like serine proteases in Cerasted venoms (Cerasted cerastes and Cerastes vipera)]. Arch Inst Pasteur Tunis 1998; 75:3-8. [PMID: 14722941] [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: 04/28/2023]
Abstract
Cerastes cerastes and Cerastes vipera snake venoms are rich of thrombin-like, serine-protease polypeptides. Many proteins have been isolated, purified and characterized from these vipers. These proteins act in various way on blood coagulation pathway and platelet function.
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Affiliation(s)
- N Marrakchi
- Faculté de Médecine de Tunis, Laboratoire des Venins et Toxines Institut Pasteur de Tunis, Tunis
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Sarlo K, Ritz HL, Fletcher ER, Schrotel KR, Clark ED. Proteolytic detergent enzymes enhance the allergic antibody responses of guinea pigs to nonproteolytic detergent enzymes in a mixture: implications for occupational exposure. J Allergy Clin Immunol 1997; 100:480-7. [PMID: 9338541 DOI: 10.1016/s0091-6749(97)70139-8] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A guinea pig intratracheal test was developed to assess the respiratory allergenicity of enzymes used in the detergent industry. Information gained from this test was used in a process for setting operational exposure guidelines to protect worker health. Mixtures of enzyme proteins were given to guinea pigs once per week for 10 weeks to determine whether there were interactions among enzymes that affected the induction of antibody responses to each enzyme in the mixture. Passive cutaneous anaphylaxis antibody titers against each enzyme were measured in sera. Mixtures of two or three enzymes always consisted of a protease (Alcalase, Savinase; Novo Industri A/S) with an alpha-amylase (Termamyl; Novo Industri A/S), a lipase (Lipolase; Novo Industri A/S), or both. Control animals were exposed to single enzymes. The antibody titers to Termamyl and Lipolase were significantly greater in animals dosed with the protease-containing mixtures as compared with control animals dosed with a single enzyme. Antibody titers to the protease were unchanged in the presence of additional enzymes in the mixture. Complete inactivation of protease activity abrogated the enhanced antibody response to Lipolase. Inhalation exposure of guinea pigs to a mixture of Alcalase and Lipolase also resulted in higher antibody titers to Lipolase as compared with animals exposed by inhalation to Lipolase alone, showing that the enhanced response was not due to intratracheal delivery of antigen to the respiratory tract. These results show that proteolytic enzymes in a mixture enhance antibody responses to other enzymes. This should be considered when defining exposure guidelines for protease-containing enzyme mixtures.
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Affiliation(s)
- K Sarlo
- Miami Valley Laboratories, The Procter & Gamble Company, Cincinnati, OH 45253-8707, USA
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Biagini RE, Driscoll RJ, Bernstein DI, Wilcox TG, Henningsen GM, MacKenzie BA, Burr GA, Scinto JD, Baumgardner ES. Hypersensitivity reactions and specific antibodies in workers exposed to industrial enzymes at a biotechnology plant. J Appl Toxicol 1996; 16:139-45. [PMID: 8935788 DOI: 10.1002/(sici)1099-1263(199603)16:2<139::aid-jat321>3.0.co;2-p] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Thirty-six employees who produced industrial enzymes from selected strains of bacteria and fungi were evaluated by epicutaneous threshold testing and enzyme-linked immunosorbent assays (ELISA) for specific IgE and IgG antibodies. The workers complained of 'asthma- and flu-like' symptoms, which generally lessened away from work. The enzymes evaluated were: alpha-amylase (1,4-alpha-d-glucan glucanohydrolase) from Bacillus licheniformis (alpha ABl), B. subtilis formation 1 (alpha A1Bs) and B. subtilis formation 2 (alpha A2Bs); purified alpha-amylase from B. licheniformis (C alpha ABl) and A. oryzae (C alpha AAo); alkaline protease from B. licheniformis (APBl) and purified alkaline protease (CAPBl); amyloglucosidase (1,4-alpha-d-glucan glucohydrolase) from A. niger (AGAn) and purified amyloglucosidase (CAGAn). Statistically significant increases (P > 0.05) in the proportion of workers having positive skin tests to CAPBl, AGAn and CAGAn were found. Significantly elevated (P > 0.05) mean specific IgE results were observed for C alpha AAo CAGAn and AGAn, and elevated (P > 0.05) mean specific IgGs were observed for C alpha AAo, CAGAn, AGAn, alpha A1Bs, alpha AB1 and alpha A2Bs. These results indicate that occupational exposure to some industrial enzymes can cause immediate-onset cutaneous hypersensitivity reactions, pulmonary function deficits and significantly elevated specific antibody levels. Our results are equivocal as to whether work-related respiratory and cutaneous hypersensitivity reactions are antibody mediated, as there was no statistically significant association between these reactions and specific IgE or IgG levels.
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Affiliation(s)
- R E Biagini
- Department of Health and Human Services, Public Health Service, National Institute for Occupational Safety and Health, Cincinnati, OH 45226, USA
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