Nous remercions Britta Hoehn, Guihua Soleil, Harris Soifer et Lisa Scherer pour les discussions utiles. Ce travail a été soutenu par des subventions des National Institutes of Health et de AI29329 HL07470 attribué à JJR Les réactifs suivants ont été obtenus par la recherche des NIH sida et Référence Reagent Program, Division du sida, du NIAID, NIH: Le CHO-EE et CHO-gp160 cellulaire ligne; l&#39;pNL4-3 Luc vecteur; VIH-1 gp120 du DAIDS BaL, le NIAID.

<ol>
	<li>Tuerk, C., Gold, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Systematic+evolution+of+ligands+by+exponential+enrichment:+RNA+ligands+to+bacteriophage+T4+DNA+polymerase.">Systematic evolution of ligands by exponential enrichment: RNA ligands to bacteriophage T4 DNA polymerase.</a> Science. 249, 505-510 (1990).</li><li>Ellington, A. D., Szostak, J. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=In+vitro+selection+of+RNA+molecules+that+bind+specific+ligands.">In vitro selection of RNA molecules that bind specific ligands.</a> Nature. 346, 818-822 (1990).</li><li>Robertson, D. L., Joyce, G. F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Selection+in+vitro+of+an+RNA+enzyme+that+specifically+cleaves+single-stranded+DNA.">Selection in vitro of an RNA enzyme that specifically cleaves single-stranded DNA.</a> Nature. 344, 467-468 (1990).</li><li>Fitzwater, T., Polisky, B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+SELEX+primer.">A SELEX primer.</a> Methods Enzymol. 267, 275-301 (1996).</li><li>Weiss, C. D., White, J. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Characterization+of+stable+Chinese+hamster+ovary+cells+expressing+wild-type,+secreted,+and+glycosylphosphatidylinositol-anchored+human+immunodeficiency+virus+type+1+envelope+glycoprotein.">Characterization of stable Chinese hamster ovary cells expressing wild-type, secreted, and glycosylphosphatidylinositol-anchored human immunodeficiency virus type 1 envelope glycoprotein.</a> J Virol. 67, 7060-706 (1993).</li><li>Vodicka, M. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Indicator+cell+lines+for+detection+of+primary+strains+of+human+and+simian+immunodeficiency+viruses.">Indicator cell lines for detection of primary strains of human and simian immunodeficiency viruses.</a> Virology. 233, 193-198> (1997).</li><li>Zhou, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Selection,+characterization+and+application+of+new+RNA+HIV+gp+120+aptamers+for+facile+delivery+of+Dicer+substrate+siRNAs+into+HIV+infected+cells.">Selection, characterization and application of new RNA HIV gp 120 aptamers for facile delivery of Dicer substrate siRNAs into HIV infected cells.</a> Nucleic Acids Res. , (2009).</li><li>Mayer, G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+chemical+biology+of+aptamers.">The chemical biology of aptamers.</a> Angew Chem Int Ed Engl. 48, 2672-2689 (2009).</li><li>Famulok, M., Hartig, J. S., Mayer, G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Functional+aptamers+and+aptazymes+in+biotechnology,+diagnostics,+and+therapy.">Functional aptamers and aptazymes in biotechnology, diagnostics, and therapy.</a> Chem Rev. 107, 3715-3743 (2007).</li><li>Chu, T. C., Twu, K. Y., Ellington, A. D., Levy, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Aptamer+mediated+siRNA+delivery.">Aptamer mediated siRNA delivery.</a> Nucleic Acids Res. 34, e73-e73 (2006).</li><li>McNamara, J. O., 2nd, . <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cell+type-specific+delivery+of+siRNAs+with+aptamer-siRNA+chimeras.">Cell type-specific delivery of siRNAs with aptamer-siRNA chimeras.</a> Nat Biotechnol. 24, 1005-1015 (2006).</li><li>Dassie, J. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Systemic+administration+of+optimized+aptamer-siRNA+chimeras+promotes+regression+of+PSMA-expressing+tumors.">Systemic administration of optimized aptamer-siRNA chimeras promotes regression of PSMA-expressing tumors.</a> Nat Biotechnol. 27, 839-849 (2009).</li><li>Zhou, J., Rossi, J. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+therapeutic+potential+of+cell-internalizing+aptamers.">The therapeutic potential of cell-internalizing aptamers.</a> Curr Top Med Chem. 9, 1144-1157 (2009).</li><li>Zhou, J., Li, H., Li, S., Zaia, J., Rossi, J. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Novel+dual+inhibitory+function+aptamer-siRNA+delivery+system+for+HIV-1+therapy.">Novel dual inhibitory function aptamer-siRNA delivery system for HIV-1 therapy.</a> Mol Ther. 16, 1481-1489 (2008).</li></ol>

J. R et JZ ont déposé un brevet sur &quot;Cell-type de système de livraison spécifique aptamère-siRNA pour le VIH-1 thérapie&quot;. USPTO, n °<strong&gt; 12/328994</strong&gt;, La date de publication: Juin 11, 2009.

Les aptamères sont des acides nucléiques in vitro évolué qui supposent spécifique et stable des formes tridimensionnelles, offrant ainsi très spécifique, obligatoire serré pour 8 molécules ciblées. La faible affinité nanomolaire liaison et la spécificité exquise d&#39;aptamères à leurs cibles en font des outils polyvalents pour le diagnostic, l&#39;imagerie in vivo, et de la thérapeutique 9. Avec l&#39;avènement de la technologie pour aptamère l...

<table border="1"><tbody><tr><th> Nom du réactif </th><th> Société </th><th> Numéro de catalogue </th><th> Commentaires (optionnel) </th></tr><tr><td> MF-Millipore filtre à membrane </td><td> Millipore </td><td> HAWP01300 </td><td> La taille des pores 0,45 pm </td></tr><tr><td> Swinnex Porte-filtre </td><td> Millipore </td><td> SX0001300 </td><td> 13 mm de diamètre </td></tr><tr><td> QIAquick Gel Extraction Kit </td><td> QIAGEN </td><td> 28706 </td><td> Purification d&#39;ADN </td></tr><tr><td> Microcon YM-30 colonne </td><td> Millipore </td><td> 42410 </td><td> Concentration d&#39;ARN </td></tr><tr><td> Bio-spin 30 colonnes </td><td> Bio-Rad </td><td> 732-6250 </td><td> Purification d&#39;ARN </td></tr><tr><td> Taq polymérase ADN PCR </td><td> Sigma-Aldrich </td><td> D1806 </td><td></td></tr><tr><td> ThermoScript RT-PCR </td><td> Invitrogen </td><td> 11146-024 </td><td></td></tr><tr><td> DuraScribe Kit de transcription T7 </td><td> EpiCentre </td><td> DS010925 </td><td></td></tr><tr><td> dNTP pour la PCR </td><td> Roche </td><td> 1 581 295 </td><td></td></tr><tr><td> L&#39;acide ribonucléique, le transfert de E.coli </td><td> Sigma-Aldrich </td><td> R1753 </td><td> compétiteur ARNt </td></tr><tr><td> VIH-1 Ba-L protéine gp120 </td><td> l&#39;AIDS Research and Référence Reagent Program </td><td> 4961 </td><td> Protéine cible </td></tr><tr><td> Kit de marquage Silencieux siARN - Cy3 </td><td> Ambion </td><td> 1632 </td><td></td></tr><tr><td> Acide phénol / chloroforme 5 / 1 solution (pH 4,5) </td><td> Ambion </td><td> AM9720 </td><td></td></tr><tr><td> Chloroforme / isopropanol 24 / 1 solution </td><td> Sigma </td><td> C0549 </td><td></td></tr><tr><td> Phosphatase intestinale de veau (CIP) </td><td> La Nouvelle-Angleterre BioLab </td><td> M0290L </td><td></td></tr><tr><td> T4 polynucléotide kinase </td><td> La Nouvelle-Angleterre BioLab </td><td> M0201L </td><td></td></tr><tr><td> Le glycogène </td><td> Roche </td><td> 10 901 393 001 </td><td> ARN précipitations </td></tr><tr><td> Gamma-P 32-ATP </td><td> MP Biomédical </td><td> 013502002 </td><td> Radiactivity </td></tr><tr><td> 40% AccuGel 19:01 </td><td> Diagnostic national </td><td> CE-850 </td><td></td></tr><tr><td> 10xTBE </td><td> Diagnostic national </td><td> CE-860 </td><td></td></tr><tr><td> N, N, N, N&#39;-tétraméthyléthylènediamine (TMEMD) </td><td> Sigma-Aldrich </td><td> T9281 </td><td></td></tr><tr><td> Le persulfate d&#39;ammonium (APS) </td><td> Sigma-Aldrich </td><td> A3678 </td><td></td></tr><tr><td> L-methioine sulfoximine </td><td> Sigma-Aldrich </td><td> M5379-250 mg </td><td></td></tr><tr><td> RPMI 1640 avec les médias </td><td> Invitrogen </td><td> 11835-030 </td><td></td></tr><tr><td> Une solution de bicarbonate de sodium, 7,5% p / v </td><td> Invitrogen </td><td> 25080-094 </td><td></td></tr><tr><td> Minimum Essential Medium (MEM) (10 ) </td><td> Invitrogen </td><td> 11430-030 </td><td></td></tr><tr><td> MEM non acides aminés essentiels (100 ) </td><td> Invitrogen </td><td> 11140-050 </td><td></td></tr><tr><td> TA cloning kit avec pCR 2.1 </td><td> Invitrogen </td><td> K2040-01 </td><td></td></tr></tbody></table>

development of cell-type specific anti-hiv gp120 aptamers for sirna delivery

L&#39;épidémie mondiale d&#39;infection par le VIH a créé un besoin urgent de nouvelles classes d&#39;agents antirétroviraux. La puissante capacité d&#39;interférents (SI) des ARN pour inhiber l&#39;expression des transcrits d&#39;ARN complémentaires est exploitée comme une nouvelle classe d&#39;agents thérapeutiques pour une variété de maladies dont le VIH. Beaucoup de rapports précédents ont montré que les nouvelles stratégies à base RNAi anti-VIH/SIDA thérapeutiques très prometteurs, mais un obstacle majeur à l&#39;application réussie thérapeutiques et la traduction clinique de siRNA est une livraison efficace. En particulier, compte tenu de la sécurité et l&#39;efficacité des traitements à base RNAi, il est hautement souhaitable de développer une approche ciblée intracellulaire livraison de siRNA à des populations spécifiques de cellules ou de tissus. Le VIH-1 protéine gp120, une glycoprotéine de l&#39;enveloppe sur la surface du VIH-1, joue un rôle important dans l&#39;entrée virale dans les cellules CD4. L&#39;interaction de la gp120 et du CD4 qui déclenche le VIH-1 entrée et initie la fusion cellulaire a été validé comme cliniquement pertinente anti-viraux stratégie de découverte de médicaments. Ici, nous avons d&#39;abord discuter de la sélection et l&#39;identification de la 2&#39;-F modifiés anti-VIH gp120 aptamères d&#39;ARN. En utilisant une méthode SELEX nitrocellulose filtre classique, plusieurs aptamères nouvelle avec une affinité nanomolaire ont été isolés à partir d&#39;un aléatoire 50 bibliothèques nt ARN. Pour réussir à obtenir des espèces lié avec une affinité plus élevée, la rigueur de sélection est soigneusement contrôlée en ajustant les conditions. Les aptamères sélectionnés peuvent se lier spécifiquement et rapidement être internalisés dans les cellules exprimant la protéine d&#39;enveloppe du VIH-1. De plus, les aptamères seul peut neutraliser le VIH-1 infectant. Sur la base des meilleures aptamère A-1, nous créons également un roman à double fonction inhibitrice anti-gp120 aptamère-siRNA chimère dans laquelle les deux l&#39;aptamère et les portions siARN ont une puissante activité anti-VIH. De plus, nous utilisons la gp120 aptamère-siRNA chimères pour un type de cellule spécifique de la livraison de siRNA sur le VIH-1 des cellules infectées. Cette double fonction chimère montre un potentiel considérable pour combiner divers agents acides nucléiques thérapeutiques (aptamère et de siRNA) à supprimer l&#39;infection VIH-1, ce qui rend les chimères aptamère-siRNA attrayants candidats thérapeutiques pour les patients en échec thérapie antirétrovirale hautement active (HAART).

Watch this Scientific Journal Video about Development of Cell-type specific anti-HIV gp120 aptamers for siRNA delivery at JoVE.com

Development of Cell-type specific anti-HIV gp120 aptamers for siRNA delivery

Plusieurs 2&#39;-fluoro aptamères d&#39;ARN contre le VIH-1BA-L gp120 avec nanomole affinité sont isolées à partir d&#39;une bibliothèque d&#39;ARN en<em&gt; In vitro</em&gt; La procédure SELEX. Un nouveau double fonction inhibitrice anti-gp120 aptamère-siRNA chimère est créé et montre prometteur pour systémiques thérapie anti-VIH.

Développement d&#39;un type de cellule spécifique anti-VIH gp120 aptamères pour la livraison de siRNA

The global epidemic of infection by HIV has created an urgent need for new classes of antiretroviral agents. The potent ability of small interfering ...

development-cell-type-specific-anti-hiv-gp120-aptamers-for-sirna

Research

JoVE Journal

Immunology and Infection

19.4K vues.  Beckman Research Institute of City of Hope. Plusieurs 2'-fluoro aptamères d'ARN contre le VIH-1BA-L gp120 avec nanomole affinité sont isolées à partir d'une bibliothèque d'ARN en In vitro La procédure SELEX. Un nouveau double fonction inhibitrice anti-gp120 aptamère-siRNA chimère est créé et montre prometteur pour systémiques thérapie anti-VIH.

Vidéo: Development of Cell-type specific anti-HIV gp120 aptamers for siRNA delivery

Development of a Negative Selectable Marker for Entamoeba histolytica

Entamoeba histolytica is the causative agent of amebiasis and infects up to 10% of the world's population. The molecular techniques that have enabled the up- and down-regulation of gene expression rely on the transfection of stably maintained plasmids. While these have increased our understanding of Entamoeba virulence factors, the capacity to integrate exogenous DNA into genome, which would allow reverse genetics experiments, would be a significant advantage in the study of this parasite. The challenges presented by this organism include inability to select for homologous recombination events and difficulty to cure episomal plasmid DNA from transfected trophozoites. The later results in a high background of exogenous DNA, a major problem in the identification of trophozoites in which a bona fide genomic integration event has occurred. We report the development of a negative selection system based upon transgenic expression of a yeast cytosine deaminase and uracil phosphoribosyl transferase chimera (FCU1) and selection with prodrug 5-fluorocytosine (5-FC). The FCU1 enzyme converts non-toxic 5-FC into toxic 5-fluorouracil and 5-fluorouridine-5'-monophosphate. E. histolytica lines expressing FCU1 were found to be 30 fold more sensitive to the prodrug compared to the control strain.

Development of a Negative Selectable Marker for Entamoeba histolytica

We report development of a negative selection system in E. histolytica based upon transgenic expression of a chimeric protein (FCU1) and selection with the prodrug 5-fluorocytosine. The FCU1 protein is a fusion of yeast cytosine deaminase and uracil phosphoribosyltransferase. Expression of FCU1 resulted in increased E. histolytica sensitivity towards 5-fluorocytosine.

Développement d&#39;un marqueur sélectionnable négatif pour les Entamoeba histolytica</em

Entamoeba histolytica is the causative agent of amebiasis and infects up to 10% of the world's population. The molecular techniques that have enabled the ...

Recherche

Immunologie et infection

Peptide:MHC Tetramer-based Enrichment of Epitope-specific T cells

A basic necessity for researchers studying adaptive immunity with in vivo experimental models is an ability to identify T cells based on their T cell antigen receptor (TCR) specificity. Many indirect methods are available in which a bulk population of T cells is stimulated in vitro with a specific antigen and epitope-specific T cells are identified through the measurement of a functional response such as proliferation, cytokine production, or expression of activation markers1. However, these methods only identify epitope-specific T cells exhibiting one of many possible functions, and they are not sensitive enough to detect epitope-specific T cells at naive precursor frequencies. A popular alternative is the TCR transgenic adoptive transfer model, in which monoclonal T cells from a TCR transgenic mouse are seeded into histocompatible hosts to create a large precursor population of epitope-specific T cells that can be easily tracked with the use of a congenic marker antibody2,3. While powerful, this method suffers from experimental artifacts associated with the unphysiological frequency of T cells with specificity for a single epitope4,5. Moreover, this system cannot be used to investigate the functional heterogeneity of epitope-specific T cell clones within a polyclonal population.
	The ideal way to study adaptive immunity should involve the direct detection of epitope-specific T cells from the endogenous T cell repertoire using a method that distinguishes TCR specificity solely by its binding to cognate peptide:MHC (pMHC) complexes. The use of pMHC tetramers and flow cytometry accomplishes this6, but is limited to the detection of high frequency populations of epitope-specific T cells only found following antigen-induced clonal expansion. In this protocol, we describe a method that coordinates the use of pMHC tetramers and magnetic cell enrichment technology to enable detection of extremely low frequency epitope-specific T cells from mouse lymphoid tissues3,7. With this technique, one can comprehensively track entire epitope-specific populations of endogenous T cells in mice at all stages of the immune response.

This protocol describes the use of peptide:MHC tetramers and magnetic microbeads to isolate low frequency populations of epitope-specific T cells and analyze them by flow cytometry. This method enables the direct study of endogenous T cell populations of interest from in vivo experimental systems.

Peptide: CMH tétramère basée sur l&#39;enrichissement des cellules T spécifiques d&#39;épitopes

A  basic necessity for researchers studying adaptive immunity with in vivo experimental models is an  ability to identify T cells based on their T cell ...

Development of an IFN-&#947; ELISpot Assay to Assess Varicella-Zoster Virus-specific Cell-mediated Immunity Following Umbilical Cord Blood Transplantation

Varicella zoster virus (VZV) is a significant cause of morbidity and mortality following umbilical cord blood transplantation (UCBT). For this reason, antiherpetic prophylaxis is administrated systematically to pediatric UCBT recipients to prevent complications associated with VZV infection, but there is no strong, evidence based consensus that defines its optimal duration. Because T cell mediated immunity is responsible for the control of VZV infection, assessing the reconstitution of VZV specific T cell responses following UCBT could provide indications as to whether prophylaxis should be maintained or can be discontinued. To this end, a VZV specific gamma interferon (IFN-&#947;) enzyme-linked immunospot (ELISpot) assay was developed to characterize IFN-&#947; production by T lymphocytes in response to in vitro stimulation with irradiated live attenuated VZV vaccine. This assay provides a rapid, reproducible and sensitive measurement of VZV specific cell mediated immunity suitable for monitoring the reconstitution of VZV specific immunity in a clinical setting and assessing immune responsiveness to VZV antigens. &#160;

Development of an IFN-&amp;#947; ELISpot Assay to Assess Varicella-Zoster Virus-specific Cell-mediated Immunity Following Umbilical Cord Blood Transplantation

Novel generations of functional assays such as gamma interferon (IFN-&#947;) ELISpot, which detect cytokine production at the single cell level and provide both quantitative and qualitative characterization of T cell responses can be used to assess cell-mediated immune responses directed against varicella zoster virus (VZV).

Développement d&#39;une varicelle-zona immunité à médiation cellulaire spécifique-Virus IFN-γ ELISPOT pour évaluer la suite de cordon ombilical transplantation de sang

Varicella zoster virus (VZV) is a significant cause of morbidity and mortality following umbilical cord blood transplantation (UCBT). For this reason, ...

Applying Fluorescence Resonance Energy Transfer (FRET) to Examine Effector Translocation Efficiency by Coxiella burnetii during siRNA Silencing

Coxiella burnetii, the causative agent of Q fever, is an intracellular pathogen that relies on a Type IV Dot/Icm Secretion System to establish a replicative niche. A cohort of effectors are translocated through this system into the host cell to manipulate host processes and allow the establishment of a unique lysosome-derived vacuole for replication. The method presented here involves the combination of two well-established techniques: specific gene silencing using siRNA and measurement of effector translocation using a FRET-based substrate that relies on &#946;-lactamase activity. Applying these two approaches, we can begin to understand the role of host factors in bacterial secretion system function and effector translocation. In this study we examined the role of Rab5A and Rab7A, both important regulators of the endocytic trafficking pathway. We demonstrate that silencing the expression of either protein results in a decrease in effector translocation efficiency. These methods can be easily modified to examine other intracellular and extracellular pathogens that also utilize secretion systems. In this way, a global picture of host factors involved in bacterial effector translocation may be revealed.

Applying Fluorescence Resonance Energy Transfer FRET to Examine Effector Translocation Efficiency by Coxiella burnetii during siRNA Silencing

Investigating the interactions between bacterial pathogens and their hosts is an important area of biological research. Here, we describe the necessary techniques to measure effector translocation by Coxiella burnetii during siRNA gene silencing using BlaM substrate.

Application Fluorescence Resonance Energy Transfer (FRET) pour examiner effecteur translocation efficacité par<em&gt; Coxiella burnetii</em&gt; Pendant siRNA Silencing

Coxiella burnetii, the causative agent of Q fever, is an intracellular pathogen that relies on a Type IV Dot/Icm Secretion System to establish a ...

Development of a More Sensitive and Specific Chromogenic Agar Medium for the Detection of Vibrio parahaemolyticus and Other Vibrio Species

Foodborne infections in the US caused by Vibrio species have shown an upward trend. In the genus Vibrio, V. parahaemolyticus is responsible for the majority of Vibrio-associated infections. Thus, accurate differentiation among Vibrio spp. and detection of V. parahaemolyticus is critically important to ensure the safety of our food supply. Although molecular techniques are increasingly common, culture-depending methods are still routinely done and they are considered standard methods in certain circumstances. Hence, a novel chromogenic agar medium was tested with the goal of providing a better method for isolation and differentiation of clinically relevant Vibrio spp. The protocol compared the sensitivity, specificity and detection limit for the detection of V. parahaemolyticus between the new chromogenic medium and a conventional medium. Various V. parahaemolyticus strains (n=22) representing diverse serotypes and source of origins were used. They were previously identified by Food and Drug Administration (FDA) and Centers for Disease Control and Prevention (CDC), and further verified in our laboratory by tlh-PCR. In at least four separate trials, these strains were inoculated on the chromogenic agar and thiosulfate-citrate-bile salts-sucrose (TCBS) agar, which is the recommended medium for culturing this species, followed by incubation at 35-37 &#176;C for 24-96 hr. Three V. parahaemolyticus strains (13.6%) did not grow optimally on TCBS, nonetheless exhibited green colonies if there was growth. Two strains (9.1%) did not yield the expected cyan colonies on the chromogenic agar. Non-V. parahaemolyticus strains (n=32) were also tested to determine the specificity of the chromogenic agar. Among these strains, 31 did not grow or exhibited other colony morphologies. The mean recovery of V. parahaemolyticus on the chromogenic agar was ~96.4% relative to tryptic soy agar supplemented with 2% NaCl. In conclusion, the new chromogenic agar is an effective medium to detect V. parahaemolyticus and to differentiate it from other vibrios.

Development of a More Sensitive and Specific Chromogenic Agar Medium for the Detection of Vibrio parahaemolyticus and Other Vibrio Species

Detection and isolation of clinically relevant Vibrio species require selective and differential culture media. This study evaluated the ability of a new chromogenic medium to detect and identify V. parahaemolyticus and other related species. The new medium was found to have better sensitivity and specificity than the conventional medium.

Développement d&#39;un plus sensible et spécifique chromogénique Agar moyen pour la détection de<em&gt; Vibrio parahaemolyticus</em&gt; Et autres<em&gt; Vibrio</em&gt; espèces

Foodborne infections in the US caused by Vibrio species have shown an upward trend. In the genus Vibrio, V. parahaemolyticus is responsible for the ...

Development of Stem Cell-derived Antigen-specific Regulatory T Cells Against Autoimmunity

Autoimmune diseases arise due to the loss of immunological self-tolerance. Regulatory T cells (Tregs) are important mediators of immunologic self-tolerance. Tregs represent about 5 - 10% of the mature CD4+ T cell subpopulation in mice and humans, with about 1 - 2% of those Tregs circulating in the peripheral blood. Induced pluripotent stem cells (iPSCs) can be differentiated into functional Tregs, which have a potential to be used for cell-based therapies of autoimmune diseases. Here, we present a method to develop antigen (Ag)-specific Tregs from iPSCs (i.e., iPSC-Tregs). The method is based on incorporating the transcription factor FoxP3 and an Ag-specific T cell receptor (TCR) into iPSCs and then differentiating on OP9 stromal cells expressing Notch ligands delta-like (DL) 1 and DL4. Following in vitro differentiation, the iPSC-Tregs express CD4, CD8, CD3, CD25, FoxP3, and Ag-specific TCR and are able to respond to Ag stimulation. This method has been successfully applied to cell-based therapy of autoimmune arthritis in a murine model. Adoptive transfer of these Ag-specific iPSC-Tregs into Ag-induced arthritis (AIA)-bearing mice has the ability to reduce joint inflammation and swelling and to prevent bone loss.

We present here a method to develop functional antigen (Ag)-specific regulatory T cells (Tregs) from induced pluripotent stem cells (iPSCs) for immunotherapy of autoimmune arthritis in a murine model.

Développement de cellules souches dérivées de cellules T régulatrices spécifiques de l&#39;antigène contre Autoimmunité

Autoimmune diseases arise due to the loss of immunological self-tolerance. Regulatory T cells (Tregs) are important mediators of immunologic ...

Development of an Economical DNA Delivery System by "Acufection" and its Application to Skin Research

Dysregulation of immune response in skin is associated with numerous human skin disorders. Direct transfer of immune-related genes into skin tissue is a fascinating approach to investigate immune modulation of cutaneous inflammation in mouse models of human diseases. Here we present a cost-effective protocol that delivered naked DNA in mouse skin and leads to transgene expression. The method is coined &#34;acufection&#34;, denoting acupuncture-mediated DNA transfection. To perform acufection, mouse skin was first infused with DNA in phosphate-buffered saline (PBS) and then pricked lightly with a bundle of acupuncture needles to facilitate the absorption of DNA and transfection into cells. The plasmid DNA is presumably taken up by the keratinocyte and dendritic cells (DCs) in the skin and expressed into protein. Mechanical prick with the needles per se did not cause skin damage or induce keratinocyte activation. The expression of the transfected genes was detected in the skin at both transcriptional and translational levels following acufection for 2 days and maintained up to 7 days. The primary goal for the development of this acufection method was to investigate a previously undefined isoform of IL-15. Using this method, an alternatively spliced IL-15 isoform with partially deleted exon 7 (IL-15&#916;E7) was expressed in the skin and subsequently treated with a Toll-like receptor 7 (TLR7) agonist, imiquimod (IMQ), to induce inflammation. Acufection-delivered IL-15&#916;E7 in skin suppressed keratinocyte proliferation, epidermal thickness and neutrophil recruitment in IMQ-induced cutaneous inflammation. With increasing interest in identifying the regulatory mechanisms of cutaneous inflammation, the protocol described here provides a cost effective and versatile alternative to the gene gun system or microseeding for DNA delivery in vivo. It may potentially allow discovery of the function of a novel gene in the skin or for investigating new treatment for cutaneous diseases.

Development of an Economical DNA Delivery System by &quot;Acufection&quot; and its Application to Skin Research

This protocol is a cost-effective alternative for expressing naked plasmid DNA in mouse skin. The overall goal of the protocol is to deliver immune-related genes into skin tissue to delineate the functional role of a specific gene in cutaneous inflammation.

Développement d&#39;un ADN Système économique Livraison par « Acufection » et son application à la recherche de la peau

Dysregulation of immune response in skin is associated with numerous human skin disorders. Direct transfer of immune-related genes into skin tissue is a ...

Zika Virus Specific Diagnostic Epitope Discovery

High-density peptide microarrays allow screening of more than six thousand peptides on a single standard microscopy slide. This method can be applied for drug discovery, therapeutic target identification, and developing of diagnostics. Here, we present a protocol to discover specific Zika virus (ZIKV) diagnostic peptides using a high-density peptide microarray. A human serum sample validated for ZIKV infection was incubated with a high-density peptide microarray containing the entire ZIKV protein translated into 3,423 unique 15 linear amino acid (aa) residues with a 14-aa residue overlap printed in duplicate. Staining with different secondary antibodies within the same array, we detected peptides that bind to Immunoglobulin M (IgM) and Immunoglobulin G (IgG) antibodies present in serum. These peptides were selected for further validation experiments. In this protocol, we describe the strategy followed to design, process, and analyze a high-density peptide microarray.

In this protocol, we describe a technique to discover Zika virus specific diagnostic peptides using a high-density peptide microarray. This protocol can readly be adapted for other emerging infectious diseases.

Zika Virus spécifique Diagnostic épitope découverte

High-density peptide microarrays allow screening of more than six thousand peptides on a single standard microscopy slide. This method can be applied for ...

Quantitative PCR of T7 Bacteriophage from Biopanning

This protocol describes the use of quantitative PCR (qPCR) to enumerate T7 phages from phage selection experiments (i.e., &#34;biopanning&#34;). qPCR is a fluorescence-based approach to quantify DNA, and here, it is adapted to quantify phage genomes as a proxy for phage particles. In this protocol, a facile phage DNA preparation method is described using high-temperature heating without additional DNA purification. The method only needs small volumes of heat-treated phages and small volumes of the qPCR reaction. qPCR is high-throughput and fast, able to process and obtain data from a 96-well plate of reactions in 2&#8211;4 h. Compared to other phage enumeration approaches, qPCR is more time-efficient. Here, qPCR is used to enumerate T7 phages identified from biopanning against in vitro cystic fibrosis-like mucus model. The qPCR method can be extended to quantify T7 phages from other experiments, including other types of biopanning (e.g.,&#160;immobilized protein binding, in vivo phage screening) and other sources (e.g., water systems or body fluids). In summary, this protocol can be modified to quantify any DNA-encapsulated viruses.

A reproducible, accurate, and time efficient quantitative PCR (qPCR) method to enumerate T7 bacteriophage is described here. The protocol clearly describes phage genomic DNA preparation, PCR reaction preparation, qPCR cycling conditions, and qPCR data analysis.

PCR quantitative du bactériophage T7 de criblage

This protocol describes the use of quantitative PCR (qPCR) to enumerate T7 phages from phage selection experiments (i.e., &#34;biopanning&#34;). qPCR is a ...

Antigenic Liposomes for Generation of Disease-specific Antibodies

Antibody responses provide critical protective immunity to a wide array of pathogens. There remains a high interest in generating robust antibodies for vaccination as well as understand how pathogenic antibody responses develop in allergies and autoimmune disease. Generating robust antigen-specific antibody responses is not always trivial. In mouse models, it often requires multiple rounds of immunizations with adjuvant that leads to a great deal of variability in the levels of induced antibodies. One example is in mouse models of peanut allergies where more robust and reproducible models that minimize mouse numbers and the use of adjuvant would be beneficial. Presented here is a highly reproducible mouse model of peanut allergy anaphylaxis. This new model relies on two key factors: (1) antigen-specific splenocytes are adoptively transferred from a peanut-sensitized mouse into a na&#239;ve recipient mouse, normalizing the number of antigen-specific memory B- and T-cells across a large number of mice; and (2) recipient mice are subsequently boosted with a strong multivalent immunogen in the form of liposomal nanoparticles displaying the major peanut allergen (Ara h 2). The major advantage of this model is its reproducibility, which ultimately lowers the number of animals used in each study, while minimizing the number of animals receiving multiple injections of adjuvant. The modular assembly of these immunogenic liposomes provides relatively facile adaptability to other allergic or autoimmune models that involve pathogenic antibodies.

Described is the preparation of antigenic liposomal nanoparticles and their use in stimulating B-cell activation in vitro and in vivo. Consistent and robust antibody responses led to the development of a new peanut allergy model. The protocol for generating antigenic liposomes can be extended to different antigens and immunization models.

Liposomes antigéniques pour la production d’anticorps spécifiques à certaines maladies

Antibody responses provide critical protective immunity to a wide array of pathogens. There remains a high interest in generating robust antibodies for ...