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https://www.readbyqxmd.com/read/28340427/identification-and-characterization-of-a-%C3%AE-defensin-gene-involved-in-the-immune-defense-response-of-channel-catfish-ictalurus-punctatus
#1
Jieyao Zhu, Hong Wang, Jun Wang, Xingli Wang, Shuang Peng, Yi Geng, Kaiyu Wang, Pin Ouyang, Zhiqiong Li, Xiaoli Huang, Defang Chen
Antimicrobial peptides are small peptides that play important roles in a host's innate immune response. As an important antimicrobial peptide, β-defensin widely distribute in mammals, insects and plants with broad-spectrum antimicrobial activity. In this study, the β-defensin gene of the channel catfish, Ictalurus punctatus, was cloned, sequenced, and subjected to a bioinformatic analysis. The β-defensin gene of the channel catfish contains three exons and two introns, and encodes a precursor peptide consisting of two domains: a signal peptide of 24 amino acid residues and a mature peptide of 43 amino acid residues...
March 21, 2017: Molecular Immunology
https://www.readbyqxmd.com/read/28337639/the-impact-of-mangiferin-from-belamcanda-chinensis-on-experimental-colitis-in-rats
#2
Marta Szandruk, Anna Merwid-Ląd, Adam Szeląg
BACKGROUND: Inflammatory bowel disease (IBD) [including Crohn's disease (CD) and ulcerative colitis (UC)] constitutes an important clinical problem. The pathogenesis of IBD remains unclear. It is believed that immune dysfunction, inflammatory mediators and oxidative damage play crucial roles in development of IBD. The condition is clinically associated with symptoms ranging from mild to severe during relapses, depending on the affected segment of the gastrointestinal tract. Bloody diarrhea with mucus, abdominal pain, weight loss and anemia are initial symptoms of both CD and UC...
March 24, 2017: Inflammopharmacology
https://www.readbyqxmd.com/read/28337212/identification-of-norway-spruce-myb-bhlh-wdr-transcription-factor-complex-members-linked-to-regulation-of-the-flavonoid-pathway
#3
Miguel Nemesio-Gorriz, Peter B Blair, Kerstin Dalman, Almuth Hammerbacher, Jenny Arnerup, Jan Stenlid, Shahid M Mukhtar, Malin Elfstrand
Transcription factors (TFs) forming MYB-bHLH-WDR complexes are known to regulate the biosynthesis of specialized metabolites in angiosperms through an intricate network. These specialized metabolites participate in a wide range of biological processes including plant growth, development, reproduction as well as in plant immunity. Studying the regulation of their biosynthesis is thus essential. While MYB (TFs) have been previously shown to control specialized metabolism (SM) in gymnosperms, the identity of their partners, in particular bHLH or WDR members, has not yet been revealed...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28336271/helminth-secretomes-reflect-different-lifestyles-and-parasitized-hosts
#4
Yesid Cuesta-Astroz, Francislon Silva de Oliveira, Laila Alves Nahum, Guilherme Oliveira
Helminths cause a number of medical and agricultural problems and are a major cause of parasitic infections in humans, animals and plants. Comparative analysis of helminth genes and genomes are important to understand the genomic biodiversity and evolution of parasites and their hosts in terms of different selective pressures in their habitats. The interactions between the infective organisms and their hosts are mediated in large part by secreted proteins, known collectively as the "secretome". Proteins secreted by parasites are able to modify a host's environment and modulate their immune system...
March 20, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28335517/state-of-the-art-on-functional-virgin-olive-oils-enriched-with-bioactive-compounds-and-their-properties
#5
REVIEW
Patricia Reboredo-Rodríguez, María Figueiredo-González, Carmen González-Barreiro, Jesús Simal-Gándara, María Desamparados Salvador, Beatriz Cancho-Grande, Giuseppe Fregapane
Virgin olive oil, the main fat of the Mediterranean diet, is per se considered as a functional food-as stated by the European Food Safety Authority (EFSA)-due to its content in healthy compounds. The daily intake of endogenous bioactive phenolics from virgin olive oil is variable due to the influence of multiple agronomic and technological factors. Thus, a good strategy to ensure an optimal intake of polyphenols through habitual diet would be to produce enriched virgin olive oil with well-known bioactive polyphenols...
March 20, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28335502/catechins-and-their-therapeutic-benefits-to-inflammatory-bowel-disease
#6
REVIEW
Fei-Yan Fan, Li-Xuan Sang, Min Jiang
Catechins are natural polyphenolic phytochemicals that exist in food and medicinal plants, such as tea, legume and rubiaceae. An increasing number of studies have associated the intake of catechins-rich foods with the prevention and treatment of chronic diseases in humans, such as inflammatory bowel disease (IBD). Some studies have demonstrated that catechins could significantly inhibit the excessive oxidative stress through direct or indirect antioxidant effects and promote the activation of the antioxidative substances such as glutathione peroxidases (GPO) and glutathione (GSH), reducing the oxidative damages to the colon...
March 19, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28333957/immune-response-of-rats-vaccinated-orally-with-various-plant-expressed-recombinant-cysteine-proteinase-constructs-when-challenged-with-fasciola-hepatica-metacercariae
#7
Malgorzata Kesik-Brodacka, Agnieszka Lipiec, Monika Kozak Ljunggren, Luiza Jedlina, Katarzyna Miedzinska, Magdalena Mikolajczak, Andrzej Plucienniczak, Andrzej B Legocki, Halina Wedrychowicz
BACKGROUND: Cysteine proteinases of Fasciola hepatica are important candidates for vaccine antigens because of their role in fluke biology and host-parasite relationships. In our previous experiments, we found that a recombinant cysteine proteinase cloned from adult F. hepatica (CPFhW) can protect rats against liver fluke infections when it is administered intramuscularly or intranasally in the form of cDNA. We also observed considerable protection upon challenge following mucosal vaccination with inclusion bodies containing recombinant CPFhW produced in Escherichia coli...
March 23, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28332603/the-arabidopsis-mir396-mediates-pathogen-associated-molecular-pattern-triggered-immune-responses-against-fungal-pathogens
#8
Mauricio Soto-Suárez, Patricia Baldrich, Detlef Weigel, Ignacio Rubio-Somoza, Blanca San Segundo
MicroRNAs (miRNAs) play a pivotal role in regulating gene expression during plant development. Although a substantial fraction of plant miRNAs has proven responsive to pathogen infection, their role in disease resistance remains largely unknown, especially during fungal infections. In this study, we screened Arabidopsis thaliana lines in which miRNA activity has been reduced using artificial miRNA target mimics (MIM lines) for their response to fungal pathogens. Reduced activity of miR396 (MIM396 plants) was found to confer broad resistance to necrotrophic and hemibiotrophic fungal pathogens...
March 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28331096/comprehensive-transcriptome-analyses-reveal-that-potato-spindle-tuber-viroid-triggers-genome-wide-changes-in-alternative-splicing-inducible-trans-acting-activity-of-phasirnas-and-immune-responses
#9
Yi Zheng, Ying Wang, Biao Ding, Zhangjun Fei
Many pathogens express non-coding RNAs (ncRNAs) during infection processes. In the most extreme case, pathogenic ncRNAs alone (such as viroids) can infect eukaryotic organisms leading to diseases. While a few of pathogenic ncRNAs have been implicated in regulating gene expression, functions of most pathogenic ncRNAs in host-pathogen interactions remain unclear. Here we employ potato spindle tuber viroid (PSTVd)-infecting tomato as a system to dissect host interactions with pathogenic ncRNAs, using comprehensive transcriptome analyses...
March 22, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28330936/biochemical-principles-and-functional-aspects-of-pipecolic-acid-biosynthesis-in-immunity
#10
Michael Hartmann, Denis Kim, Friederike Bernsdorff, Ziba Ajami-Rashidi, Nicola Scholten, Stefan Schreiber, Tatyana Zeier, Stefan Schuck, Vanessa Reichel-Deland, Jürgen Zeier
The non-protein amino acid pipecolic acid (Pip) regulates plant systemic acquired resistance (SAR) and basal immunity to bacterial pathogen infection. In Arabidopsis thaliana, the Lys aminotransferase AGD2-LIKE DEFENSE RESPONSE PROTEIN1 (ALD1) mediates the pathogen-induced accumulation of Pip in inoculated and distal leaf tissue. Here we show that ALD1 transfers the alpha-amino group of L-Lys to acceptor oxoacids. Combined mass spectrometric and infrared spectroscopic analyses of in vitro assays and plant extracts indicate that the final product of the ALD1-catalysed reaction is enaminic 2,3-dehydropipecolic acid (2,3-DP), whose formation involves consecutive transamination, cyclization and isomerization steps...
March 22, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28330935/the-role-of-enhanced-responses-to-aba1-era1-in-arabidopsis-stomatal-responses-is-beyond-aba-signaling
#11
Pirko Jalakas, Yi-Chun Huang, Yu-Hung Yeh, Laurent Zimmerli, Ebe Merilo, Hannes Kollist, Mikael Brosche
Proper stomatal responses are essential for plant function in an altered environment. The core signaling pathway for abscisic acid (ABA)-induced stomatal closure involves perception of the hormone that leads to the activation of guard cell anion channels by the protein kinase OPEN STOMATA1 (OST1). Several other regulators are suggested to modulate the ABA signaling pathway, including the protein ENHANCED RESPONSE TO ABA 1 (ERA1), that encodes the farnesyl transferase beta subunit. The era1 mutant is hypersensitive to ABA during seed germination and shows a more closed stomata phenotype...
March 22, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28330129/the-recombinant-pea-defensin-drr230a-is-active-against-impacting-soybean-and-cotton-pathogenic-fungi-from-the-genera-fusarium-colletotrichum-and-phakopsora
#12
Ariane Ferreira Lacerda, Rafael Perseghini Del Sarto, Marilia Santos Silva, Erico Augusto Rosas de Vasconcelos, Roberta Ramos Coelho, Vanessa Olinto Dos Santos, Claudia Vieira Godoy, Claudine Dinali Santos Seixas, Maria Cristina Mattar da Silva, Maria Fatima Grossi-de-Sa
Plant defensins are antifungal peptides produced by the innate immune system plants developed to circumvent fungal infection. The defensin Drr230a, originally isolated from pea, has been previously shown to be active against various entomopathogenic and phytopathogenic fungi. In the present study, the activity of a yeast-expressed recombinant Drr230a protein (rDrr230a) was tested against impacting soybean and cotton fungi. First, the gene was subcloned into the yeast expression vector pPICZαA and expressed in Pichia pastoris...
June 2016: 3 Biotech
https://www.readbyqxmd.com/read/28326446/blastocystis-how-do-specific-diets-and-human-gut-microbiota-affect-its-development-and-pathogenicity
#13
REVIEW
M Lepczyńska, J Białkowska, E Dzika, K Piskorz-Ogórek, J Korycińska
Blastocystis is an enteric parasite that inhabits the gastrointestinal tract of humans and many animals. This emerging parasite has a worldwide distribution. It is often identified as the most common eukaryotic organism reported in human fecal samples. This parasite is recognized and diagnosed more often than ever before. Furthermore, some strains develop resistance against currently recommended drugs, such as metronidazole; therefore, the use of natural remedies or special diets has many positive aspects that may address this problem...
March 22, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28325765/caenorhabditis-elegans-rig-i-homolog-mediates-antiviral-rna-interference-downstream-of-dicer-dependent-biogenesis-of-viral-small-interfering-rnas
#14
Stephanie R Coffman, Jinfeng Lu, Xunyang Guo, Jing Zhong, Hongshan Jiang, Gina Broitman-Maduro, Wan-Xiang Li, Rui Lu, Morris Maduro, Shou-Wei Ding
Dicer enzymes process virus-specific double-stranded RNA (dsRNA) into small interfering RNAs (siRNAs) to initiate specific antiviral defense by related RNA interference (RNAi) pathways in plants, insects, nematodes, and mammals. Antiviral RNAi in Caenorhabditis elegans requires Dicer-related helicase 1 (DRH-1), not found in plants and insects but highly homologous to mammalian retinoic acid-inducible gene I (RIG-I)-like receptors (RLRs), intracellular viral RNA sensors that trigger innate immunity against RNA virus infection...
March 21, 2017: MBio
https://www.readbyqxmd.com/read/28323544/host-diet-affects-the-morphology-of-a-butterfly-parasite
#15
Kevin Ming-Kong Hoang, Leiling Tao, Jacobus C de Roode, Mark D Hunter
Understanding host-parasite interactions is essential for ecological research, wildlife conservation and health management. While most studies focus on numerical traits of parasite groups, such as changes in parasite load, less focus is placed on the traits of individual parasites, such as parasite size and shape (parasite morphology). Parasite morphology has significant effects on parasite fitness, such as initial colonization of hosts, avoidance of host immune defenses, and the availability of resources for parasite replication...
March 21, 2017: Journal of Parasitology
https://www.readbyqxmd.com/read/28323529/altered-expression-of-a-chloroplast-protein-affects-the-outcome-of-virus-and-nematode-infection
#16
Elena Ganusova, J Hollis Rice, Timothy Scott Carlew, Akshita Patel, Emmanuel Perrodin-Njoku, Tarek Hewezi, Tessa M Burch-Smith
The chloroplast-resident RNA helicase ISE2 (INCREASED SIZE EXCLUSION LIMIT 2) can modulate the formation and distribution of plasmodesmata and intercellular trafficking. We have determined that ISE2 expression is induced by viral infection. Therefore the responses of Nicotiana benthamiana plants with varying levels of ISE2 expression to infection by Tobacco mosaic virus (TMV) and Turnip mosaic virus (TuMV) were examined. Surprisingly, increased or decreased ISE2 expression led to faster viral systemic spread and is some cases enhanced systemic necrosis...
March 21, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28323528/plant-immunity-inducer-development-and-application
#17
Dewen Qiu, Yijie Dong, Yi Zhang, Shupeng Li, Fachao Shi
Plant immunity inducers represent a new and rapidly developing field in plant protection research. In this paper, we discuss recent research on plant immunity inducers and their development and applications in China. Plant immunity inducers include plant immunity-inducing proteins, chitosan oligosaccharides, and microbial inducers. These compounds and microorganisms can trigger defense responses and confer disease resistance in plants. We also describe the mechanisms of plant immunity inducers and how they promote plant health...
March 21, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28323017/whole-genome-sequencing-of-bacillus-velezensis-ls69-a-strain-with-a-broad-inhibitory-spectrum-against-pathogenic-bacteria
#18
Guoqiang Liu, Yingying Kong, Yajing Fan, Ce Geng, Donghai Peng, Ming Sun
Bacillus velezensis LS69 was found to exhibit antagonistic activity against a diverse spectrum of pathogenic bacteria. It has one circular chromosome of 3,917,761bp with 3,643 open reading frames. Genome analysis identified ten gene clusters involved in nonribosomal synthesis of polyketides (macrolactin, bacillaene and difficidin), lipopeptides (surfactin, fengycin, bacilysin and iturin A) and bacteriocins (amylolysin and amylocyclicin). In addition, B. velezensis LS69 was found to contain a series of genes involved in enhancing plant growth and triggering plant immunity...
March 17, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28318979/a-phytophthora-effector-manipulates-host-histone-acetylation-and-reprograms-defense-gene-expression-to-promote-infection
#19
Liang Kong, Xufang Qiu, Jiangang Kang, Yang Wang, Han Chen, Jie Huang, Min Qiu, Yao Zhao, Guanghui Kong, Zhenchuan Ma, Yan Wang, Wenwu Ye, Suomeng Dong, Wenbo Ma, Yuanchao Wang
Immune response during pathogen infection requires extensive transcription reprogramming. A fundamental mechanism of transcriptional regulation is histone acetylation. However, how pathogens interfere with this process to promote disease remains largely unknown. Here we demonstrate that the cytoplasmic effector PsAvh23 produced by the soybean pathogen Phytophthora sojae acts as a modulator of histone acetyltransferase (HAT) in plants. PsAvh23 binds to the ADA2 subunit of the HAT complex SAGA and disrupts its assembly by interfering with the association of ADA2 with the catalytic subunit GCN5...
March 11, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28317896/use-of-rna-seq-data-to-identify-and-validate-rt-qpcr-reference-genes-for-studying-the-tomato-pseudomonas-pathosystem
#20
Marina A Pombo, Yi Zheng, Zhangjun Fei, Gregory B Martin, Hernan G Rosli
The agronomical relevant tomato-Pseudomonas syringae pv. tomato pathosystem is widely used to explore and understand the underlying mechanisms of the plant immune response. Transcript abundance estimation, mainly through reverse transcription-quantitative PCR (RT-qPCR), is a common approach employed to investigate the possible role of a candidate gene in certain biological process under study. The accuracy of this technique relies heavily on the selection of adequate reference genes. Initially, genes derived from other techniques (such as Northern blots) were used as reference genes in RT-qPCR experiments, but recent studies in different systems suggest that many of these genes are not stably expressed...
March 20, 2017: Scientific Reports
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