Name: a protein microarray assay for serological determination of antigen-specific antibody responses following clostridium difficile infection
Uploaded: 2018-06-15T14:00:00
Description: Watch this Scientific Journal Video about A Protein Microarray Assay for Serological Determination of Antigen-specific Antibody Responses Following Clostridium difficile Infection at JoVE.com

Questa ricerca è stata sostenuta da una borsa di Hermes da Ola Negm e Tanya Monaghan e attraverso finanziamento separato dal centro di malattie Digestive di Nottingham e il NIHR Nottingham digestivi malattie Biomedical Research Centre.

1. preparazione di un piatto di Microarray
<ol><li>Diluire gli antigeni di c. difficile con un buffer di stampa [PBS-Tween-trealosio (50mm)] alla concentrazione ottima (che è stata predefinita prima di eseguire i sieri dei pazienti): tossina A (200 µ g/mL) e tossina B (100 µ g/mL), pCDTb (200 µ g/mL) e nativo purificato SLPs tutta derivata da ribotypes 001, 002 e 027 (200 µ g/mL). Nota: La tossina B è stata ottenuta da una tossina B-esprimendo ceppo CCUG 20309 (90 µ g/mL).<ol>
<li>Diluire i controlli...

<ol>
	<li>Negm, O. H., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Profiling+humoral+immune+responses+to+Clostridium+difficile.-specific+antigens+by+protein+microarray+analysis.">Profiling humoral immune responses to Clostridium difficile.-specific antigens by protein microarray analysis.</a> Clinical and Vaccine Immunology. 22 (9), 1033-1039 (2015).</li><li>Monaghan, T. M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=High+prevalence+of+subclass-specific+binding+and+neutralizing+antibodies+against+Clostridium+difficile.+toxins+in+adult+cystic+fibrosis+sera:+possible+mode+of+immunoprotection+against+symptomatic+C.+difficile+infection.">High prevalence of subclass-specific binding and neutralizing antibodies against Clostridium difficile. toxins in adult cystic fibrosis sera: possible mode of immunoprotection against symptomatic C. difficile infection.</a> Clinical and Experimental Gastroenterology. 10, 169-175 (2017).</li><li>Negm, O. H., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Protective+antibodies+against+Clostridium+difficile.+are+present+in+intravenous+immunoglobulin+and+are+retained+in+humans+following+its+administration.">Protective antibodies against Clostridium difficile. are present in intravenous immunoglobulin and are retained in humans following its administration.</a> Clinical &amp; Experimental Immunology. 188 (3), 437-443 (2017).</li><li>Monaghan, T., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=OC-058+A+protein+microarray+assay+for+predicting+severe+outcomes+in+Clostridium+difficile+infection.">OC-058 A protein microarray assay for predicting severe outcomes in Clostridium difficile infection.</a> Gut. 66, 31 (2017).</li><li>Bacon, A. 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A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Serum+anti-toxin+B+antibody+correlates+with+protection+from+recurrent+Clostridium+difficile+infection+(CDI).">Serum anti-toxin B antibody correlates with protection from recurrent Clostridium difficile infection (CDI).</a> Vaccine. 28 (4), 965-969 (2010).</li><li>Drudy, D., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Human+antibody+response+to+surface+layer+proteins+in+Clostridium+difficile+infection.">Human antibody response to surface layer proteins in Clostridium difficile infection.</a> FEMS Immunology and Medical Microbiology. 41 (3), 237-242 (2004).</li><li>Bauer, M. P., Nibbering, P. H., Poxton, I. R., Kuijper, E. J., van Dissel, J. 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H., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Bezlotoxumab+for+prevention+of+recurrent+Clostridium+difficile+infection.">Bezlotoxumab for prevention of recurrent Clostridium difficile infection.</a> The New England Journal of Medicine. 376 (4), 305-317 (2017).</li><li>Leuzzi, R., Adamo, R., Scarselli, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Vaccines+against+Clostridium+difficile.">Vaccines against Clostridium difficile.</a> Human Vaccines &amp; Immunotherapeutics. 10 (6), 1466-1477 (2014).</li><li>Ghose, C., Kelly, C. 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Z., Zhu, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Applications+in+high-content+functional+protein+microarrays.">Applications in high-content functional protein microarrays.</a> Current Opinion in Chemical Biology. 30, 21-27 (2016).</li><li>Crompton, P. D., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+prospective+analysis+of+the+Ab+response+to+Plasmodium+falciparum+before+and+after+a+malaria+season+by+protein+microarray.">A prospective analysis of the Ab response to Plasmodium falciparum before and after a malaria season by protein microarray.</a> Proceedings of the National Academy of Sciences of the United States of America. 107 (15), 6958-6963 (2010).</li><li>Khodakov, D. 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In questo protocollo, abbiamo dimostrato che microarray è una piattaforma adatta per definire le risposte immunitarie umorali agli antigeni della proteina c. difficile in sieri dei pazienti (figure 3 e 6) e preparazioni commerciali di IVIg (Figura 5). Abbiamo anche dimostrato che la tecnica di microarray esegue anche quando rispetto ai convenzionale ELISA (Figura 2) e Mostra eccellente riproducibilità, con variabilit?...

Questo protocollo descrive lo sviluppo e la convalida di un'analisi di microarray della proteina di romanzo e su misura per il rilevamento e semi-quantificazione del ceppo batterico e le risposte specifiche dell'isotipo dell'anticorpo agli antigeni di c. difficile . Utilizziamo con successo la nostra difficile del c.-analisi di microarray specifici come un promettente nuovo strumento per la bioanalysis compositiva del contenuto di anticorpi specifici nei sieri dei pazienti1,2, preparazioni di IVIg3, e identificazione delle specificità dell'anticorpo che correlano con i risultati difficili in CDI4. Dimostriamo come campioni di siero biobanked e preparazioni commerciali di IVIg possono essere analizzate su diapositive di microarray, che permette alta qualità riproducibile profilatura delle risposte di agente patogeno specifico anticorpo di c. difficile in questo test.
Molti bambini sani e adulti hanno anticorpi IgG e IgA siero rilevabile c. difficile tossine A e B5,6. Questi sono pensati per risultare a seguito di esposizione transitoria durante l'infanzia e dopo esposizione a c. difficile in età adulta. Per questo motivo, policlonali IVIg è stato utilizzato off-label per il trattamento sia ricorrente e fulminante CDI7,8,9. Tuttavia, il suo ruolo definitivo e modalità di azione rimane poco chiaro. Parecchi studi hanno indicato che la risposta immunitaria umorale alle tossine di c. difficile svolge un ruolo nella presentazione della malattia e nel risultato. In particolare, i pazienti asintomatici mostrano una concentrazione aumentata del siero anti-tossina A IgG rispetto ai pazienti che sviluppano la malattia sintomatica10. Un'associazione dimostrabile è stata segnalata per i titoli di IgG A di mediano anti-tossina e mortalità per qualsiasi causa 30 giorni11. Parecchi rapporti hanno rivelato anche un'associazione con una protezione contro le risposte di ricorrenza e l'anticorpo per la tossina A, B e diversi antigeni non-tossina (Cwp66, Cwp84, FliC, FliD e proteine di strato di superficie (SLP))12,13 , 14 , 15. queste osservazioni hanno stimolato lo sviluppo del primo immunoterapia passiva drug targeting c. difficile tossina B (bezlotuxumab), che è stato recentemente approvato dalla US Food and Drug Administration e l'Agenzia europea dei Agenzia per la prevenzione di ricorrenti CDI16. Strategie vaccinali utilizzando le tossine inattivate o frammenti di tossina ricombinante sono inoltre attualmente in sviluppo17,18,19. Questi nuovi approcci terapeutici senza dubbio stimolerà il requisito per valutare le risposte immunitarie umorali agli antigeni multipli in campioni di grandi dimensioni.
Oggi, c'è una notevole mancanza di saggi ad alta velocità disponibile in commercio in grado di valutare contemporaneamente il ceppo batterico e le risposte specifiche dell'isotipo dell'anticorpo agli antigeni di c. difficile . C'è un bisogno insoddisfatto per sviluppare tali dosaggi per facilitare gli sforzi di ricerca futura e applicazioni cliniche. Microarrays della proteina sono un metodo per immobilizzare un numero elevato di proteine purificate individualmente come matrice spazialmente organizzata dei punti su una superficie basata su vetrino al microscopio utilizzando un sistema robotico, che può essere un contatto20 o un non-contatto stampa strumento21. Le macchie possono rappresentare miscele complesse come lisati cellulari, anticorpi, omogenati, proteine endogene o ricombinante o peptidi, fluidi corporei o farmaci22,23.
Tecnologia di microarray della proteina offre chiari vantaggi rispetto a standard in-House ELISA tecniche, che sono stati tradizionalmente usati per valutare le risposte di anticorpi di anti -c. difficile . Questi includono una maggiore capacità per la rilevazione di una gamma di multi-specifici anticorpi contro un pannello più ampio di bersagli proteici, requisiti di volume ridotto per gli antigeni, campioni e reagenti e una maggiore capacità di incorporare una più grande numero di repliche tecniche, oltre a controllo di qualità interno multiple (QC) misura1. I microarrays sono quindi più sensibile, accurato e riproducibile e hanno una maggiore gamma dinamica. Questi fattori rendono i microarrays un'alternativa più conveniente e potenzialmente favorevole a Elisa per la rilevazione su larga scala di proteine note. Tuttavia, gli svantaggi della tecnologia microarray dovuti principalmente i grandi costi iniziali associati che istituisce un pannello di antigeni altamente purificati e la creazione della piattaforma tecnologica.
Microarrays della proteina sono stati ampiamente utilizzati negli ultimi due decenni come strumento di ricerca diagnostica di base in applicazioni cliniche. Applicazioni specifiche includono l'espressione della proteina di profilatura, lo studio delle relazioni di enzima-substrato, lo screening biomarcatore, analisi delle interazioni ospite-microbo e profilatura anticorpo specificità23,24, 25,26,27,28. Molti nuovo agente patogeno/antigene della proteina microarrays sono stati stabiliti, tra cui la malaria (Plasmodium)29, HIV-130, riossidazione31, sindrome respiratoria acuta grave (SARS)32, febbre emorragica virale33 , herpesvirus34e35di tubercolosi.
Il presente protocollo si riferisce all'istituzione di un facile funzionamento C. difficile reattiva dosaggio dell'antigene microarray, che consente la quantificazione precisa e specifica di multi-isotipo e le risposte dell'anticorpo specifico ceppo di C. difficile antigeni nel siero e policlonale IVIg. Nel presente documento, includiamo risultati rappresentativi relativi ad una prestazione di analisi di microarray di accettabile rispetto a ELISA così come dosaggio precisione e riproducibilità profili. Questo test potrebbe essere ulteriormente sviluppato per profilare altri campioni clinici e stabilisce un nuovo standard per la ricerca della base molecolare della CDI.

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			<td height="21" style="height:21px;width:399px;">BioRobotics MicroGrid II arrayer</td>
			<td style="width:296px;">Digilab, Malborough, MA, USA</td>
			<td style="width:296px;">N/A</td>
			<td style="width:836px;">Contact arrayer used to automated spotting of the antigens onto the slides.</td>
		</tr>
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			<td height="21" style="height:21px;">Scanner InnoScan 710.</td>
			<td>Innopsys</td>
			<td>N/A</td>
			<td>A fluorescent microarray slide scanner with a red (Cy5) laser to read the reaction.</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">MAPIX software version 7.2.0</td>
			<td>Innopsys</td>
			<td>N/A</td>
			<td>Measure signal intensities of the spots.</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Silicon contact pin</td>
			<td>Parallel Synthesis Technologies</td>
			<td>SMT-P75</td>
			<td>Print the samples onto the slides.</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Thermo Scientific Nalgene Desiccator</td>
			<td>Thermo Scientific</td>
			<td>41102426</td>
			<td>To store the new and printed slides.</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">384-well plate</td>
			<td>Genetix</td>
			<td>X7022UN</td>
			<td>To prepare the antigens.</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Plate cover</td>
			<td>Sigma Aldrich, UK</td>
			<td>CLS6570-100EA</td>
			<td>To reduce evaporation of the samples.</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Aminosilane slides</td>
			<td>Schott,&#160; Germany</td>
			<td>1064875</td>
			<td>The slide of choice for printing the antigens.</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Slide holders</td>
			<td>GraceBio Labs, USA</td>
			<td>204862</td>
			<td>Divide the slides into identical 16 subarrays. These holders are re-usable, removable, leak-proof wells .&#160;</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Candida albicans lysate</td>
			<td>NIBSC</td>
			<td>PR-BA117-S</td>
			<td>Positive control</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Tetanus Toxoid&#160;</td>
			<td>Athens Research and Technology</td>
			<td>04/150</td>
			<td>Positive control</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Immunoglobulin G (IgG), Normal Human Plasma</td>
			<td>&#160;Athens research and&#160; technology&#160;&#160;</td>
			<td>16-16-090707</td>
			<td>Purified Native Human Immunoglobulin G IgG, Human Plasma.&#160;</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Immunoglobulin G1 (IgG1), Normal Human Plasma</td>
			<td>&#160;Athens research and&#160; technology&#160;&#160;</td>
			<td>16-16-090707-1</td>
			<td>Purified Native Human Immunoglobulin G1 IgG1, Human Plasma.&#160;</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Immunoglobulin G2 (IgG2), Normal Human Plasma</td>
			<td>&#160;Athens research and&#160; technology&#160;&#160;</td>
			<td>16-16-090707-2</td>
			<td>Purified Native Human Immunoglobulin G2 IgG2, Human Plasma.&#160;</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Immunoglobulin G3 (IgG3), Normal Human Plasma</td>
			<td>&#160;Athens research and&#160; technology&#160;&#160;</td>
			<td>16-16-090707-3</td>
			<td>Purified Native Human Immunoglobulin G3 IgG3, Human Plasma.&#160;</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Immunoglobulin G4 (IgG4), Normal Human Plasma</td>
			<td>&#160;Athens research and&#160; technology&#160;&#160;</td>
			<td>16-16-090707-4</td>
			<td>Purified Native Human Immunoglobulin G4 IgG4, Human Plasma.&#160;</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Immunoglobulin A (IgA), Human Plasma</td>
			<td>&#160;Athens research and&#160; technology&#160;&#160;</td>
			<td>16-16-090701</td>
			<td>Purified Native Human Immunoglobulin A (IgA), Human Plasma.</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Immunoglobulin A1 (IgA1), Human Myeloma Plasma</td>
			<td>&#160;Athens research and&#160; technology&#160;&#160;</td>
			<td>16-16-090701-1M</td>
			<td>Purified Native Human Immunoglobulin A1 (IgA1), Human Plasma.</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Immunoglobulin A2 (IgA2), Human Myeloma Plasma</td>
			<td>&#160;Athens research and&#160; technology&#160;&#160;</td>
			<td>16-16-090701-2M</td>
			<td>Purified Native Human Immunoglobulin A2 (IgA2), Human Plasma.</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Immunoglobulin M (IgM), Human Plasma</td>
			<td>&#160;Athens research and&#160; technology&#160;&#160;</td>
			<td>16-16-090713</td>
			<td>Purified Native Human Immunoglobulin M (IgM), Human Plasma.</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Biotinylated Goat Anti-Human IgG Antibody, gamma chain specific</td>
			<td>Vector Labs</td>
			<td>BA-3080</td>
			<td>Goat anti- human IgG (&#947;-chain specific)-biotin antibody reacts specifically with human IgG but not with other immunoglobulins.</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Mouse Anti-Human IgG1 Hinge-BIOT</td>
			<td>Southern Biotec</td>
			<td>9052-08&#160;</td>
			<td>Goat anti- human IgG1 biotin antibody reacts specifically with human IgG1 but not with other immunoglobulins.</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Mouse Anti-Human IgG2 Fc-BIOT</td>
			<td>Southern Biotec</td>
			<td>9060-08&#160;&#160;</td>
			<td>Goat anti- human IgG2 -biotin antibody reacts specifically with human IgG 2but not with other immunoglobulins.</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Mouse Anti-Human IgG3 Hinge-BIOT</td>
			<td>Southern Biotec</td>
			<td>9210-08&#160;&#160;&#160;</td>
			<td>Goat anti- human IgG3-biotin antibody reacts specifically with human IgG3 but not with other immunoglobulins.</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Mouse Anti-Human IgG4 pFc&#39;-BIOT</td>
			<td>Southern Biotec</td>
			<td>9190-08&#160;&#160;</td>
			<td>Goat anti- human IgG-biotin antibody reacts specifically with human IgG but not with other immunoglobulins.</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Anti-Human IgA, alpha chain specific, made in goat - Biotinylated</td>
			<td>Vector Labs</td>
			<td>BA-3030</td>
			<td>Goat anti- human IgG -biotin antibody reacts specifically with human IgG but not with other immunoglobulins.</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Mouse Anti-Human IgA1-BIOT</td>
			<td>Southern Biotec</td>
			<td>9130-08</td>
			<td>Goat anti- human IgG -biotin antibody reacts specifically with human IgG but not with other immunoglobulins.</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Mouse Anti-Human IgA2-BIOT</td>
			<td>Southern Biotec</td>
			<td>9140-08&#160;&#160;</td>
			<td>Goat anti- human IgG -biotin antibody reacts specifically with human IgG but not with other immunoglobulins.</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Mouse Anti-Human IgM-BIOT</td>
			<td>Southern Biotec</td>
			<td>9020-08&#160;</td>
			<td>Goat anti- human IgG-biotin antibody reacts specifically with human IgG but not with other immunoglobulins.</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">0.2 mm syringe filter</td>
			<td>Thermo scientific</td>
			<td>723-2520</td>
			<td>Filter the 5% BSA.</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Bovine Serum Albumin (BSA)</td>
			<td>Sigma Aldrich, UK</td>
			<td>A7284</td>
			<td>Use 5% BSA for blocking the slides.</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Antibody diluent</td>
			<td>Dako, UK</td>
			<td>S3022</td>
			<td>To dilute the serum and the secondary antibody.</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Streptavidin Cy5</td>
			<td>eBioscience</td>
			<td>SA1011</td>
			<td>Detection of the immune reaction.</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Purified whole C. difficile toxins A and B (toxinotype 0, strain VPI 10463, ribotype 087)</td>
			<td>Toxins Group, Public Health England</td>
			<td>NA</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Purified whole C. difficile toxin B (CCUG 20309 toxin B only expressing strain)</td>
			<td>Toxins Group, Public Health England</td>
			<td>NA</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Precursor form of B fragment of binary toxin, pCDTb</td>
			<td>University of Bath&#160;</td>
			<td>NA</td>
			<td>Produced in E. Coli from wholly synthetic recombinant gene construct. Amino acid sequence based on published sequence from 027 ribotype (http:www.uniprot.org/uniprot/A8DS70)</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Purified native whole ribotype-specific (001, 002, 027) surface layer proteins</td>
			<td>Dublin City University&#160;</td>
			<td>NA</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Vigam (IVIg preparation 1)</td>
			<td>Nottingham University Hospitals NHS Trust</td>
			<td>N/A</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Privigen (IVIg preparation 2)</td>
			<td>Nottingham University Hospitals NHS Trust</td>
			<td>N/A</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Intratect (IVIg preparation 3)</td>
			<td>Nottingham University Hospitals NHS Trust</td>
			<td>N/A</td>
			<td></td>
		</tr>
	</tbody>
</table>

a protein microarray assay for serological determination of antigen-specific antibody responses following clostridium difficile infection

Forniamo una panoramica dettagliata di un'analisi di microarray di romanzo della proteina ad alta produttività per la determinazione di anti -Clostridium difficile livelli di anticorpi nel siero umano e in preparazioni separate di policlonale dell'immunoglobulina endovenosa (IVIg). Il protocollo descrive i passaggi metodologici coinvolti nella preparazione del campione, stampa delle matrici, procedura di dosaggio e analisi dei dati. Inoltre, questo protocollo potrebbe essere ulteriormente sviluppato per incorporare diversi campioni clinici tra cui plasma e surnatanti di cella. Vi mostriamo come microarray della proteina può essere utilizzato per determinare una combinazione di isotipo (IgG, IgA, IgM), sottoclasse (IgG1, IgG2, IgG3, IgG4, IgA1, IgA2) e ceppo-specifici anticorpi altamente purificato tutta c. difficile tossine A e B (toxinotype 0, ceppo VPI 10463, ribotipo 087), la tossina B da un c. difficile tossina B-sola espressione ceppo (CCUG 20309), una forma di precursore di un frammento di B della tossina binaria, pCDTb, proteine di tutta la superficie strato ribotipo-specifico (SLPs; 001, 002, 027) e proteine (tetano di controllo tossoide tetanico e Candida albicans). Durante l'esperimento, microarrays sono sondati con i sieri da individui con l'infezione di c. difficile (CDI), gli individui con fibrosi cistica (CF) senza diarrea, controlli sani (HC) e da individui pre- e post-IVIg terapia per la trattamento di CDI, immunodeficienza combinata disordine e Poliradicolite demielinizzante infiammatoria cronica. Incontriamo differenze significative nei livelli di anticorpo specifico multi-isotipo di efficacies di neutralizzazione della tossina e tra gruppi di pazienti, preparazioni commerciali di IVIg e la sera prima e dopo somministrazione di IVIg. Inoltre, c'è una correlazione significativa tra microarray e analisi enzima-collegata dell'immunosorbente (ELISA) per i livelli di IgG antitossina in campioni di siero. Questi risultati indicano che microarray potrebbe diventare uno strumento promettente per profilatura risposte anticorpali agli antigeni di C.difficile in esseri umani infettati o vaccinati. Con ulteriore affinamento dei pannelli di antigene e una riduzione dei costi di produzione, possiamo anticipare che la tecnologia microarray può aiutare ottimizzare e selezionare i più clinicamente utile immunoterapie per infezione da c. difficile in modo specifico per ogni paziente.

La figura 1 illustra un diagramma di flusso che descrive i passaggi principali del protocollo descritto. La figura 2 Mostra il test di correlazione di Spearman dimostrando significativo accordo tra microarray ed ELISA per IgG e IgA anti-tossina A e B livelli in sieri paziente. La figura 3 Mostra differenziale IgG e IgA anticorpi-classe risposte anticorpali specifici per la tossina A, B, binario tossi...

Watch this Scientific Journal Video about A Protein Microarray Assay for Serological Determination of Antigen-specific Antibody Responses Following Clostridium difficile Infection at JoVE.com

A Protein Microarray Assay for Serological Determination of Antigen-specific Antibody Responses Following Clostridium difficile Infection

Questo articolo viene descritto un metodo di microarray della proteina semplice per profilatura risposte immunitarie umorali a un panel 7-plex di altamente purificata antigeni di Clostridium difficile in sieri umani. Il protocollo può essere esteso per la determinazione della risposta di anticorpo specifico nelle preparazioni a base di immunoglobuline policlonali.

Un'analisi di Microarray della proteina per determinazione sierologica dell'infezione di Clostridium difficile anticorpo seguenti risposte antigene-specifiche

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A Protein Microarray Assay for Serological Determination of Antigen-specific Antibody Responses Following Clostridium difficile Infection

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