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Registros recuperados: 38
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A Sustained Immune Response Supports Long-Term Antiviral Immune Priming in the Pacific Oyster, Crassostrea gigas ArchiMer
Lafont, Maxime; Vergnes, Agnes; Vidal-dupiol, Jeremie; De Lorgeril, Julien; Gueguen, Yannick; Haffner, Philippe; Petton, Bruno; Chaparro, Cristian; Barrachina, Celia; Destoumieux-garzon, Delphine; Mitta, Guillaume; Gourbal, Benjamin; Montagnani, Caroline.
Over the last decade, innate immune priming has been evidenced in many invertebrate phyla. If mechanistic models have been proposed, molecular studies aiming to substantiate these models have remained scarce. We reveal here the transcriptional signature associated with immune priming in the oyster Crassostrea gigas. Oysters were fully protected against Ostreid herpesvirus 1 (OsHV-1), a major oyster pathogen, after priming with poly(I·C), which mimics viral double-stranded RNA. Global analysis through RNA sequencing of oyster and viral genes after immune priming and viral infection revealed that poly(I·C) induces a strong antiviral response that impairs OsHV-1 replication. Protection is based on a sustained upregulation of immune genes, notably genes...
Tipo: Text Palavras-chave: Innate immunity; Priming; OsHV-1; Antiviral response; Immune memory; Oyster; POMS; Poly(I·C); Interferon; Transcriptomic.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00614/72580/71541.pdf
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Antimicrobial peptides and nitric oxide production by neutrophils from periodontitis subjects BJMBR
Mariano,F.S.; Campanelli,A.P.; Nociti Jr.,F.H.; Mattos-Graner,R.O.; Gonçalves,R.B..
Neutrophils play an important role in periodontitis by producing nitric oxide (NO) and antimicrobial peptides, molecules with microbicidal activity via oxygen-dependent and -independent mechanisms, respectively. It is unknown whether variation in the production of antimicrobial peptides such as LL-37, human neutrophil peptides (HNP) 1-3, and NO by neutrophils influences the pathogenesis of periodontal diseases. We compared the production of these peptides and NO by lipopolysaccharide (LPS)-stimulated neutrophils isolated from healthy subjects and from patients with periodontitis. Peripheral blood neutrophils were cultured with or without Aggregatibacter actinomycetemcomitans-LPS (Aa-LPS), Porphyromonas gingivalis-LPS (Pg-LPS) and Escherichia coli-LPS...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antimicrobial peptides; Nitric oxide; Neutrophils; Periodontitis; Innate immunity.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2012001100004
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BgTEP: An Antiprotease Involved in Innate Immune Sensing in Biomphalaria glabrata ArchiMer
Portet, Anais; Galinier, Richard; Pinaud, Silvain; Portela, Julien; Nowacki, Fanny; Gourbal, Benjamin; Duval, David.
Insect thioester-containing protein (iTEP) is the most recently defined group among the thioester-containing protein (TEP) superfamily. TEPs are key components of the immune system, and iTEPs from flies and mosquitoes were shown to be major immune weapons. Initially characterized from insects, TEP genes homologous to iTEP were further described from several other invertebrates including arthropods, cniderians, and mollusks albeit with few functional characterizations. In the freshwater snail Biomphalaria glabrata, a vector of the schistosomiasis disease, the presence of a TEP protein (BgTEP) was previously described in a well-defined immune complex involving snail lectins (fibrinogen-related proteins) and schistosome parasite mucins (SmPoMuc). To...
Tipo: Text Palavras-chave: Thioester-containing protein; Complement-like protein; Biomphalaria glabrata; Interaction host/pathogens; Innate immunity.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00444/55548/71780.tif
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Cecropins as a marker of Spodoptera frugiperda immunosuppression during entomopathogenic bacterial challenge ArchiMer
Duvic, B.; Jouan, V.; Essa, N.; Girard, P-a; Pages, S.; Khattar, Z. Abi; Volkoff, N-a; Givaudan, A.; Destoumieux-garzon, Delphine; Escoubas, Jean-michel.
An antimicrobial peptide (AMP) of the cecropin family was isolated by HPLC from plasma of the insect pest, Spodoptera frugiperda. Its molecular mass is 3910.9 Da as determined by mass spectrometry. Thanks to the EST database Spodobase, we were able to describe 13 cDNAs encoding six different cecropins which belong to the sub-families CecA, CecB, CecC and CecD. The purified peptide identified as CecB1 was chemically synthesized (syCecB1). It was shown to be active against Gram-positive and Gram-negative bacteria as well as fungi. Two closely related entomopathogenic bacteria, Xenorhabdus nematophila F1 and Xenorhabdus mauleonii VC01(T) showed different susceptibility to syCecB1. Indeed, X. nematophila was sensitive to syCecB1 whereas X. mauleonii had a...
Tipo: Text Palavras-chave: Humoral immunity; Innate immunity; Immunosuppression; Lepidopteran; Invertebrate.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00086/19728/17485.pdf
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Comportements cellulaires et régulation génétique au cours des réactions d'immunité innée chez la moule Mytilus galloprovincialis ArchiMer
Li, Hui.
The mytiliculture is one of the most important aquaculture in the world, however, little is known on the mussel immune system, which plays a critical role in case of infectious diseases. Like all the other invertebrates, our model, the Mediterranean mussel Mytilus galloprovincialis, possesses only an innate immune system considered to be primitive and non-specific. In the present study, our results showed that the mussel immune system (i) is capable of responding differently to a variety of stimulations, suggesting a specific recognition process; (ii) reacts differently according to the geographic origin of the animals, showing an adaptation to their own environment; (iii) is influenced by the season, which explains the seasonal mortalities; (iv) presents...
Tipo: Text Palavras-chave: Mytilus; Haemocyte; Antimicrobial peptides; Polymorphism; Genetic regulation; Innate immunity; Mytilus; Hémocyte; Peptides antimicrobiens; Polymorphisme; Régulation génétique; Immunité innée.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/these-6241.pdf
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Curraleiro Pé Duro cattle breed (Bos taurus) differ in phagocytic Neutrophil function related to crossbreed cattle (Bos taurus X Bos indicus). Repositório Alice
JULIANO, R. S.; FIORAVANTI, M. C. S.; SILVA, A. R. B.; SOUZA, S. N.; OLIVEIRA, H. F.; COUTO, S. C. P.; MUN IZ JUNQUEIRA, M. I..
This work aimed to evaluate hematological parameters and phagocytic neutrophil functions of naturally selected Curraleiro Pé Duro cattle breed (Bos taurus) and crossbreed cattle (Bos taurus X Bos indicus). Two groups of adult cows: Natural= Curraleiro Pé Duro cattle breed (n=10) and Selected = ¾ Nelore X Simental crossbreed animals (n=10) were evaluated. Blood was sampled to make hemogram, in vitro evaluation of neutrophil phagocytosis and basal Nitroblue Tetrazolium - NBT reduction (without any stimulus). The results showed no difference in hematological parameters between these groups. Natural group had greater phagocytic index of neutrophils through pathogen-associated molecular patterns receptors (PAMPs) while in Selected group this same index was...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Innate immunity; Phagocytosis; Oxidative metabolism; Local cattle breed; Imunidade inata; Fagocitose; Metabolismo oxidative; Raça bovina local; Hematologia; Produção animal; Hematologic tests; Blood composition.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1048281
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Cytokines in innate and acquired immunity to Trypanosoma cruzi infection BJMBR
Abrahamsohn,I.A..
Resistance to Trypanosoma cruzi infections is critically dependent on cytokine-mediated activation of cell-mediated immune effector mechanisms. This review focuses on the role of IL-10, TNF-<FONT FACE="Symbol">a</font>, IFN-<FONT FACE="Symbol">g</font> and IL-12 in controlling T. cruzi replication by the innate and specific immune systems of the vertebrate host. A study performed on mice with disrupted recombinase-activating genes (RAG/KO), which lack T and B lymphocytes, revealed the importance of IL-12, IFN-<FONT FACE="Symbol">g</font> and TNF-<FONT FACE="Symbol">a</font> in the resistance against T. cruzi mediated by the innate immune system. In addition, data from experiments using IL-10 KO, RAG/KO and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Trypanosoma cruzi; Interferon-gamma; Interleukin-12; TNF-alpha; Interleukin-10; Innate immunity; Knock-out mice.
Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998000100015
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DEFB1 gene polymorphisms and tuberculosis in a Northeastern Brazilian population BJM
Silva,Ronaldo Celerino da; Cruz,Heidi Lacerda Alves da; Brandão,Lucas André Cavalcanti; Guimarães,Rafael Lima; Montenegro,Lilian Maria Lapa; Schindler,Haiana Charifker; Segat,Ludovica; Crovella,Sergio.
Abstract β-Defensin-1, an antimicrobial peptide encoded by the DEFB1 gene, is known to play an important role in lung mucosal immunity. In our association study we analyzed three DEFB1 functional polymorphisms -52G>A (rs1799946), -44C>G (rs1800972) and -20G>A (rs11362) in 92 tuberculosis patients and 286 healthy controls, both from Northeast Brazil: no association was found between the studied DEFB1 polymorphisms and the disease. However we cannot exclude that this lack of association could be due to the low number of subjects analyzed, as suggested by the low statistical power achieved for the three analyzed SNPs (values between 0.16 and 0.50).
Tipo: Info:eu-repo/semantics/article Palavras-chave: Tuberculosis; Innate immunity; DEFB1; Genotyping; Polymorphism.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822016000200389
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Differential distribution and defence involvement of antimicrobial peptides in mussel ArchiMer
Mitta, Guillaume; Vandenbulcke, Franck; Noel, Thierry; Romestand, Bernard; Beauvillain, Jean Claude; Salzet, Michel; Roch, Philippe.
In previous papers, we characterised 3 types of 4-kDa, cysteine-rich, cationic antimicrobial peptides: MGDs (for Mytilus galloprovincialis defensins), mytilins and myticins, which are abundant in the mussel hemocytes. In the present work, me revealed a differential distribution of the cells expressing the different genes. In addition, using confocal and electron microscopy, we confirmed that defensins and mytilins were partially located in different sub-types of circulating hemocytes although the peptides can be located in the same cell, and even in the same granule. We also demonstrated that mytilins exert their microbicidal effect within the cells through the process of phagosome-mytilin granule fusion leading to the co-location of ingested bacteria and...
Tipo: Text Palavras-chave: Innate immunity; Hemocyte; Mussel; Myticin; Mytilin; Defensin; Antimicrobial.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/2000/publication-413.pdf
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Effect of cyhalothrin on Ehrlich tumor growth and macrophage activity in mice BJMBR
Quinteiro-Filho,W.M.; Righi,D.A.; Palermo-Neto,J..
Cyhalothrin, a pyrethroid insecticide, induces stress-like symptoms, increases c-fos immunoreactivity in the paraventricular nucleus of the hypothalamus, and decreases innate immune responses in laboratory animals. Macrophages are key elements in cellular immune responses and operate at the tumor-host interface. This study investigated the relationship among cyhalothrin effects on Ehrlich tumor growth, serum corticosterone levels and peritoneal macrophage activity in mice. Three experiments were done with 10 experimental (single gavage administration of 3.0 mg/kg cyhalothrin daily for 7 days) and 10 control (single gavage administration of 1.0 mL/kg vehicle of cyhalothrin preparation daily for 7 days) isogenic BALB/c mice in each experiment. Cyhalothrin i)...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cyhalothrin; Corticosterone; Macrophage; Ehrlich tumor; Innate immunity; HPA axis.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2009001000006
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Effect of PHA and LPS on the Activity of Nonspecific Cytotoxic Cells and Macrophages of Rainbow Trout (Oncorhynchus mykiss) Gayana
Gómez,Leonardo A; Cortés,Raúl; Smith,Carlos T.
This work studied the effect of the lectin phytohaemagglutinin (PHA) and bacterial lipopolysaccharide (LPS) on the activity of nonspecific cytotoxic cells (NCCs) and macrophages of peripheral blood in the rainbow trout. NCCs are cells of the innate immunity, homologues to Natural Killer (NK) cells of mammals, capable of eliminating cells infected with intracellular pathogens and also tumoral cells. Their lytic activity is mediated by the perforin/granzyme system and the Fas receptor-Fas ligand (FasR-FasL) system. Activity of NCCs was evaluated by their capacity to lyse HL-60 tumor cells. On the other hand, macrophages eliminate microorganisms by several mechanisms, including the production of reactive oxygen species (ROS) and nitric oxide (NO). Results...
Tipo: Journal article Palavras-chave: Interleukins; Innate immunity; FasR-FasL; Lectins; Leukocytes.
Ano: 2013 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382013000100007
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Endometrial transcription of microbial molecular patterns receptors in Gyr and F1 Holstein x Gyr postpartum cows Arq. Bras. Med. Vet. Zootec.
Martins,T.M.; Muniz,C.S.; Paixão,T.A.; Ruas,J.R.M.; Santos,R.L.; Borges,Á.M..
ABSTRACT Zebu and Holstein x Zebu crossbred have low incidence of uterine infection when compared to Holstein cows. Resistance to uterine infections may be associated with the ability to recognize invading microorganisms. Endometrial transcription of microbial molecular patterns receptors has been investigated in the postpartum period of Holstein cows, but it is completely unknown in Zebu or Holstein x Zebu cows. In this study, 9 Gyr and 12 F1 Holstein x Gyr cows were submitted to endometrial biopsies at the first and seventh days postpartum, with the objective to measure transcription levels of toll-like receptors (TLRs) 1/6, 2, 4, 5, and 9; nucleotide-binding oligomerization domain (NOD)-like receptors 1 and 2; and coreceptors cluster of differentiation...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Zebu cows; Endometrial biopsy; Innate immunity; Toll-like receptors.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352017000400835
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Expression, tissue localization and synergy of antimicrobial peptides and proteins in the immune response of the oyster Crassostrea gigas ArchiMer
Schmitt, Paulina; De Lorgeril, Julien; Gueguen, Yannick; Destoumieux-garzon, Delphine; Bachere, Evelyne.
Diverse families of antimicrobial peptides and proteins have been described in oysters. We investigated here how antimicrobials are involved in the immune response against a pathogenic strain of Vibrio splendidus. Oyster antimicrobials were shown to display a wide variety of expression profiles in hemocyte populations and tissues. Oyster defensins are constitutively expressed in specific tissues such as mantle (Cg-Defm) or hemocytes (Cg-Defhs), while Cg-BPI is inducible and Cg-Prp appears down-regulated in hemocytes upon infection. The migratory behavior of hemocytes that express the different antimicrobials was found to be involved in the oyster response to a pathogenic Vibrio infection. Indeed, it contributes to colocalize several antimicrobials that...
Tipo: Text Palavras-chave: Pacific oyster; Bivalve mollusk; Innate immunity; Bactericidal/permeability-increasing protein; Proline-rich peptide; Defensin; Vibrio.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00093/20382/18267.pdf
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First evidence for a Vibrio strain pathogenic to Mytilus edulis altering hemocyte immune capacities ArchiMer
Ben Cheikh, Yosra; Travers, Marie-agnes; Morga, Benjamin; Godfrin, Yoann; Rioult, Damien; Le Foll, Franck.
Bacterial isolates were obtained from mortality events affecting Mytilus edulis and reported by professionals in 2010-2013 or from mussel microflora. Experimental infections allowed the selection of two isolates affiliated to V. splendidus/V. hemicentroti type strains: a virulent 10/068 1T1 (76,6% and 90% mortalities in 24h and 96h) and an innocuous 12/056 M24T1 (0% and 23,3% in 24h and 96h). These two strains were GFP-tagged and validated for their growth characteristics and virulence as genuine models for exposure. Then, host cellular immune responses to the microbial invaders were assessed. In the presence of the virulent strain, hemocyte motility was instantaneously enhanced but markedly slowed down after 2h exposure. By contrast, hemocyte velocity...
Tipo: Text Palavras-chave: Innate immunity; Molluscs; Cell-mediated immune response; Bacterial infections; Green fluorescent protein.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00302/41336/40522.pdf
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Galectins and collectinis expression are increased in Haemonchus contortus-infected corriedale sheep. Repositório Alice
SOUZA, B. M. P. da S.; LAMBERT, S. M.; NISHI, S. M.; BENAVIDES, M. V.; BERNE, M. E. A.; MADRUGA, C. R.; ALMEIDA, M. A. O. de..
Galectins and collectins are proteins classi!ed in the lectin family that have the ability to recognize molecular patterns associated with pathogens. Studies on cattle have demonstrated high expression of these proteins during infection with gastrointestinal nematodes. "e aim of this study was to investigate whether the level of Haemonchus contortus infection would alter the expression of galectins (Gal11 and Gal14) and collectins (SPA and CGN) in sheep. Twelve Corriedale sheep exposed to natural infection with nematodes were divided into two groups: group 1 (G1, n = 7) and group 2 (G2, n = 5), with low and high parasite burdens, respectively, based on fecal egg counts and abomasal parasite counts. The fecal egg counts and abomasal parasite counts were...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Pequenos ruminantes; PCR; Lectina; Helminto; Imunidade; Ruminante; Ovelha; Innate immunity; Lectins; Helminths; Small ruminants; Sheep.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1037115
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Glabralysins, Potential New β-Pore-Forming Toxin Family Members from the Schistosomiasis Vector Snail Biomphalaria glabrata ArchiMer
Lassalle, Damien; Tetreau, Guillaume; Pinaud, Silvain; Galinier, Richard; Crickmore, Neil; Gourbal, Benjamain; Duval, David.
Biomphalaria glabrata is a freshwater Planorbidae snail. In its environment, this mollusk faces numerous microorganisms or pathogens, and has developed sophisticated innate immune mechanisms to survive. The mechanisms of recognition are quite well understood in Biomphalaria glabrata, but immune effectors have been seldom described. In this study, we analyzed a new family of potential immune effectors and characterized five new genes that were named Glabralysins. The five Glabralysin genes showed different genomic structures and the high degree of amino acid identity between the Glabralysins, and the presence of the conserved ETX/MTX2 domain, support the hypothesis that they are pore-forming toxins. In addition, tertiary structure prediction confirms that...
Tipo: Text Palavras-chave: Pore-forming toxin; Cry toxin; Invertebrate; Biomphalaria glabrata; Host; Pathogen; Vector snail; Innate immunity.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00601/71267/69655.pdf
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Histological Observation and Expression Patterns of antimicrobial peptides during Fungal Infection in Musca domestica (Diptera: Muscidae) Larvae BABT
Jiangfan,Xiu; Tao,Wang; Yu,Wang; Jianwei,Wu; Guo,Guo; Yingchun,Zhang; Xiaoli,Shang.
ABSTRACT Housefly, Musca domestica, has a complicated immune system. However, its underlying operating mechanism remains elusive. Candida albicans is a major pathogen affecting humans by causing deep infection fungous disease, but it is non-symbiotic in houseflies. To investigate the C. albicans infection process in housefly, the changes in morphological and histological and expression patterns of antimicrobial peptide were monitored to indicate the insect's response to fungal infection. The results showed that scattered brown spots were comprising melanized encapsulation and encapsulated fungal cells were initially observed at the inner side of larvae's body wall 3 h post-infection (PI). Between 6 and 36 h PI, the whole body of larvae was densely covered...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Musca domestica; Larvae; Candida albicans; Infection; Innate immunity.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132016000100340
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Immune response elicited by the oral administration of an intermediate strain of IBDV in chickens BJM
Carballeda,Juan Manuel; Zoth,Silvina Chimeno; Gómez,Evangelina; Lucero,María Soledad; Gravisaco,María José; Berinstein,Analía.
The immune response elicited by the oral inoculation of an intermediate strain of infectious bursal disease virus was studied in chickens. A strong over expression of IL-6, IL-8, IFNα and IFNγ was observed in bursa at 3 days post inoculation together with an increase in splenic NO2 release. An influx of T-lymphocytes was also detected.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Infectious Bursal Disease virus; Innate immunity; Avian cytokines; Flow cytometry; RT-qPCR.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822014000400049
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Immune System Dysfunction in the Elderly Anais da ABC (AABC)
FUENTES,EDUARDO; FUENTES,MANUEL; ALARCÓN,MARCELO; PALOMO,IVÁN.
ABSTRACT Human aging is characterized by both physical and physiological frailty that profoundly affects the immune system. In this context aging is associated with declines in adaptive and innate immunity established as immunosenescence. Immunosenescence is a new concept that reflects the age-associated restructuring changes of innate and adaptive immune functions. Thus elderly individuals usually present chronic low-level inflammation, higher infection rates and chronic diseases. A study of alterations in the immune system during aging could provide a potentially useful biomarker for the evaluation of immune senescence treatment. The immune system is the result of the interplay between innate and adaptive immunity, yet the impact of aging on this...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aging; Immunosenescence; Adaptive immunity; Innate immunity; Inflammation..
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100285
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Immunotherapeutic potential of Crotoxin: anti-inflammatory and immunosuppressive properties J. Venom. Anim. Toxins incl. Trop. Dis.
Sartim,Marco Aurélio; Menaldo,Danilo Luccas; Sampaio,Suely Vilela.
Abstract For the past 80 years, Crotoxin has become one of the most investigated isolated toxins from snake venoms, partially due to its major role as the main toxic component in the venom of the South American rattlesnake Crotalus durissus terrificus. However, in the past decades, progressive studies have led researchers to shift their focus on Crotoxin, opening novel perspectives and applications as a therapeutic approach. Although this toxin acts on a wide variety of biological events, the modulation of immune responses is considered as one of its most relevant behaviors. Therefore, the present review describes the scientific investigations on the capacity of Crotoxin to modulate anti-inflammatory and immunosuppressive responses, and its application as...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Crotalus durissus terrificus; Crotoxin; Innate immunity; Adaptative immunity; Inflammation.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992018000100329
Registros recuperados: 38
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