This work was supported by BC Lung Association and Mitacs.

1. Bakteriyel soyun ve Gelişim Ortamı <ol><li> büyükbaş hayvan serum albümini, 25 g dekstroz, 10.0 g, deiyonize su, 460 mL sodyum klorür, 4.05 g çözündürülmesi ile albümin dekstroz ve tuz stok çözeltisi (ADS) konur. 4 ° C&#39;de ADS ve mağaza Filtre sterilize. </li><li> 7H9 toz, 4.7 g ve arıtılmış suyun 900 mL gliserol 2 ml ilave edilerek 7H9 suyu olun. 10 dakika boyunca 121 ° C &#39;de 7H9 suyu Otoklav ve devam etmeden önce, oda sıcaklığına kadar soğumaya bırakın. ADS 100 mL ve 7H9 suyu 900 mL Tween® 80, 0.5 mL ilave edilerek 7H9ADST olun. 4 ° C&#39;de saklayın. </li><li> kanamisin sülfat, 50 mg tartılır ve deiyonize su içinde 1 mL içinde çözülür; son konsantrasyon 50 mg / mL&#39;dir. Filtre ile sterilize edilir ve -20 ° C&#39;de saklayın. 7H9ADST 1 L başına stok solüsyonu kanamisin 0.5 mL ekleyin. Bu ortam, taze yapılmalıdır, bu nedenle kültür büyüklüğüne göre uygun hacimleri ölçek: NOT. </li><li> 7H&#39;da M. tuberculosis büyütün9ADST kültüründe kanamisin ile takviye edilmiştir. Günlük kültürünü çalkalayın ve OD600 kümelenmeyi önlemek 1,0 ulaşmadan önce seyreltin. NOT: Bu yöntemin geliştirilmesi için kullanılan, M. tuberculosis türü H37Rv pJAK2.A plazmid 12 ile transforme edilmiştir. pJAK2.A hsp60 promotörü &#39;dan ateş böceği lusiferaz geninin yüksek düzeyde ifade edilmesini sağlayan ve kanamisin kullanılarak seçilebilir pMV361 vektörü göre entegre bir plazmiddir. </li></ol> 2. THP-1 Orta ve Bakım <ol><li> RPMI tam olmayan ortam (yaklaşık% 10 FBS ve 2 mM glutamin) yapmak için ısı ile inaktive edilmiş fetal büyükbaş hayvan serumu (FBS) ve RPMI 1640, 500 mL, 200 mM L-glutamin, 5 mL, 50 mL ekleyin. </li><li> Standart protokol 13 uyarınca bir THP-1 hücre kültürünün muhafaza edin. pas arasındaki ortamın mL başına 1 milyon 0.2 bir hücre yoğunluğuna korurken Kısaca, RPMI tam olmayan bir ortam içinde, THP-1 hücreleri büyütmekBilgeler. </li></ol> 3. Yüksek verim Hücre içi Eleme Lusiferaz ifade eden M. tuberculosis H37Rv&#39;den kullanma <ol><li> 600 nm bir dalga boyunda bir spektrofotometre aktif olarak büyüyen bir bakteri süspansiyonu optik yoğunluk ölçülür. ML başına 0.1 OD600 = 3 x 10 7 bakteri dönüştürme faktörü kullanılarak bakteriyel yoğunluğa hesaplayın. </li><li> Yeni bir santrifüj tüpü içine 1: enfeksiyon, 10 (MOI) bir çokluğu için yeterli bakterileri Pipet. 10 dakika boyunca 3000 x g&#39;de Pelet ve sıvı aspire. RPMI1640 450 uL insan serumu, 50 uL ekleyin. Deney için değerleri uygun kaynaklarına hacmini Ölçek. </li><li> Bakteri opsonize için,% 10 insan serumu içeren RPMI1640 500 uL başına 1 x 10 8 bakteri yoğunluğunda pelletini. Karışım 30 dakika boyunca 37 ° C&#39;de kuluçkada bırakın. Bir hemasitometre ve ters mikroskobik ile sayma ile THP-1 hücre kültürü yoğunluğunun belirlemepe. </li><li> 100 xg steril santrifüj tüplerinde pelet hücreleri ve 10 dakika için 37 ° C. Süpernatant aspire ve eksik mL için 1 milyon hücre yoğunluğunda RPMI hücreleri tekrar süspansiyon. 40 ng / ml nihai konsantrasyona, forbol-12-miristat-13-asetat (PMA) ekleyin. NOT: Bu farklılaşma karışımı olarak anılacaktır. </li><li> 10 MOI&#39;de THP-1 farklılaşma karışımı ile opsonize M. tuberculosis birleştirin: 1 ve bir 96-gözlü düz dipli beyaz plaka oyuk başına 100 uL nihai karışım kısım. Düzenli bütünlüğü sağlamak için karışım karıştırılır. Farklılaşma ve enfeksiyon,% 5 CO2 içeren nemli bir inkübatör içinde 37 ° C&#39;de gece boyunca devam izin verin. </li><li> RPMI her 100 uL kuyular iki kere yıkayın. Eksik RPMI içinde arzu edilen konsantrasyonlara kadar seyreltildi bileşikler ilave edin ve 3 gün inkübe edilir. </li><li> kuyu ortamı aspire. Her kuyuya lusiferaz deneme ayıracı 50 mcL ekleyin. t plakaları sızdırmazransparent yapışkan plaka ayırıcılar. 22 ° C&#39;de inkübasyondan 5 dakika bekleyin, daha sonra 1 saniye bir luminometrede bir okuma elde etmek ile sabitleştirilir. </li></ol> 4. Sitotoksisite Analizi: 3- (4,5-dimetiltiazol-2-il) -2,5-difeniltetrazolyum bromit (MTT) kullanılarak Deney 14 <ol><li> RPMI içinde, THP-1 hücreleri ayırt eksik açık 96 oyuklu plakalar içinde PMA 40 ng / ml ile takviye edilmiştir. Hücre mL başına 1 milyon yoğunluğu ve kısım oyuk başına 100 uL koruyun. Farklılaşma,% 5 CO2 içeren nemli bir inkübatör içinde 37 ° C&#39;de gece boyunca devam izin verin. </li><li> çukurlara eksik RPMI içinde seyreltilmiş bileşikler ekleme kuyulardan orta aspire edilmiş ve RPMI 1640 ile iki kez yıkayın. 3 gün boyunca inkübe. </li><li> 5 mg / mL&#39;lik bir stok çözelti yapmak için fosfat tamponlu tuzlu su (PBS) 100 mL MTT 0.5 g eritin. uzak ışık -20 ° C&#39;de steril filtre ve depolamak; Bu çözüm, taze hale getirmek için en iyisidir. </li><li> 2.5 saat beforE 3 günlük kuluçka süresinin sonunda, her bir göze MTT çözeltisi 25 mcL ve kuluçka dönemi doldurun. </li><li> % 50 N hazırlanması, N-dimetil formamid (DMF), deiyonize su, 250 mL DMF, 250 mL karıştırılarak. </li><li> aşağıdaki şekilde MTT ekstraksiyon tamponu hazırlayın: 500 mL&#39;lik bir şişe içinde SDS 100 g tartılır ve% 50 DMF ve 300 ml. SDS ile erimesi için düşük ısı uygulayın. Saf asetik asit içinde 10 mL 1 M HCI 12.5 mL ekleyin. % 50 DMF ile 500 ml işaretine kadar doldurmak; ekstraksiyon tamponu nihai bileşimin% 50 DMF,% 20 SDS,% 2.5 asetik asit ve% 2.5 1 M hidroklorik asittir. </li><li> Tedavi süresinin sonunda, her bir göze (herhangi bir kristallerin çözünmesi için 45 ° C&#39;ye kadar ısıtıldı), öz çıkarma tamponu içerisinde 100 uL ilave edin. Karışım, 37 ° C&#39;de gece boyunca inkübe izin verin % 5 CO2 içeren nemli bir inkübatör içinde ° C. 570 nm de absorbans okuyunuz. NOT: sitotoksisite deneyi iyi bir hücreler arası paralel olarak gerçekleştirilirTHP-1 hücrelerinin, aynı kesikli ve yaş ile ular ekranı. </li></ol> 5. In-suyu Aktivite Analizi Bir Resazurin Deney 3 kullanma <ol><li> Orta log fazı (- 0.8 OD 600 ~ 0.5) 7H9ADST M. tuberculosis büyütün. 0.01 OD 600 7H9ADST ile kültür seyreltin. her bir her bir seyreltilmiş bileşik test konsantrasyonları ve kısım 100 uL 2x 7H9ADST bileşikleri seyreltin. </li><li> Her kuyuya seyreltilmiş bakteri süspansiyonu 100 uL aktarın. Plakalar 5 gün için nemli bir inkübatör içinde 37 ° C&#39;de kuluçkada bırakın. iyonu giderilmiş su ve steril filtre 100 mL resazurin 10 mg çözülür. </li><li> 30 uL resazurin çözeltisi ekleyin ve 48 saat sonra renk değişikliği izlemek; Bakteri üremesi pembe mavi bir renk dönüşümü ile gösterilir. NOT: nicel analizi de 530 eksıtasyonla 590 nm&#39;de floresans, ya ölçülerek yapılabilir - 560nm ya da 570 nm &#39;de absorbans 600 nm ile 15 nm. </li></ol>

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The authors declare no competing financial interests for this work.

Bu çalışmanın amacı, M. tuberculosis için bir insan hücre içi enfeksiyon modeli kullanılarak basit ve düşük maliyetli HTS yöntemini yaratmaktı. Tüberküloz, M. tuberculosis ile alveoler makrofajların enfeksiyonu ile karakterize edilen bir insan hastalıktır. Nedeniyle bio, bakteri ve konak hücrelerin hem biyolojik modellerini kapsayan araştırma, geçmişte kullanılmıştır. Ancak, vekil bakteri ve insan olmayan modellerin kullanımı ilaç tarama iyi M. tuberculosis <sup ...

Mycobacterium tuberculosis, Tüberküloz (TB) neden olan madde, dünyada morbidite ve mortalitenin başlıca nedenidir. İlaç duyarlı TBC 6 aylık bir süre için birden fazla antibiyotik gerektiren tedavi edilebilir bir hastalıktır. Tedavi edilebilen bir hastalık olmasına rağmen, TBC ölüm 2015 1 1.5 milyon olarak tahmin edilmiştir. Geçtiğimiz 10 yıl içinde, ilaca dirençli M. tuberculosis yaygınlığı kaygıları var artmaktadır. Ilaca dirençli TB (MDR-TB), en azından isoniazid (INH) ve Rifampisin (RMP), ve en çok MDR-TB kökler böylece tedavi seçenekleri sınırlayıcı ikinci satırı TBC ilaçların seçilmesi de dirençlidir dirençli TB olarak tanımlanmaktadır . ilaç direnci etkilerini İnsan İmmün Yetmezlik Virüsü (HIV) ile ko-enfekte hastaların tedavisi için daha büyük bir sorun oluşturabilir; 400.000 kadar hasta 2015 1 &#39;de HIV ile ilişkili TB öldü. Hayal kırıklığıyla, ABD Gıda ve İlaç Dairesi&#39;ninrasyon Son 40 yılda 2, MDR-TB, Bedaquiline karşı tek yeni TB ilacı onayladı. Daha iyi ve daha kısa TB terapileri bulmakta gelişmeler acilen TB ve MDR-TB ile mücadelede önde kalabilmek için ihtiyaç vardır. Geleneksel olarak, TB ilaç ekranlar bileşiklerin artan bir kültüre ilave edilmiştir ve mikroorganizmalar yok etmek etkinlikleri katı ortam üzerinde koloni oluşturan birim (CFU) sayımı ile tespit edilir ve böylece büyüme ortamında in vitro büyüme koşulları altında gerçekleştirilir. CFU sayımları emek yoğun, zaman tüketen ve masraflı olduğu için, çeşitli dolaylı yöntemler bu sorunu hafifletmek için geliştirilmiştir. Bu yöntemler, Alamar Mavisi canlılığı deneyi 3, yeşil floresan protein (GFP) veya lusiferaz sentezleyen bakterilerden lüminesans 5&#39;ten floresan 4 belirlenmesini ve toplam adenozin trifosfat tahmin (A içerirTP) 6, 7. Tipik TB bakterileri bulunan ve alveoler makrofajlar 8 fagozomların içinde replike akciğer, bir M. tuberculosis enfeksiyonuna ile karakterize edilir. basit-et suyu fenotipik ekran hücre dışı patojenlerin uygun olabilir; Ancak tarihsel perspektifte, bu yöntem kullanılarak tespit M. tuberculosis bileşikler genellikle enfeksiyon modellerinde mansap doğrulama adımları sırasında beklentileri yaşamak için başarısız çarptı. Biz TB ilaç iyi bir intraselüler konakçı hücresi enfeksiyon modelinde yapılır öneriyoruz. Bununla birlikte, hücre içi modeller yüksek verimli tarama (HTS) gelişimine birçok teknolojik ve biyolojik engelleri sahiptirler. Büyük bir engel sayıda adımları ve yıkama-arasında hücre dışı bakteri ayrıntılı çıkarılması ile örneklenen, enfeksiyon süreci karmaşıklığıdır. İkinci büyük engel uzun zaman yeniden olduğunugerekliliklerine göre çıkarılabilirdir normal CFU kültür levhaları üzerinde sayılarak yapılır büyüme tespiti olarak tamamlamak için üzerinde 3 hafta süren bir işlemdir. CFU sayımları yerine bir çözüm floresan bakteri ile birlikte otomatik floresan mikroskobu tarafından sağlanmıştır. Ancak bu çözüm birçok araştırma laboratuvarları için ulaşamayacağı bir başlangıç ​​ekipman yatırım gerektirir. Basit, düşük maliyetli ve hastalığa ilgili HTS yöntemi büyük ölçüde ilaç keşif sürecini artıracak. Bu çalışmada, hücre içi M. tuberculosis bileşiklerin aktivitesini belirlemek için uygun bir hızlı ve yüksek ölçekli, ancak ekonomik, tahlil sağlamayı hedefleyen yeni modüler HTS sistemi bildirmektedir. (I), hücre içi, (ii) sitotoksisite, ve (iii) &#39;de-et suyu çorbası deneyleri: Bu sistem üç modülden oluşmaktadır. Birleştirilen Nihai sonuç işlevinin potansiyel modu için ek bilgi ile, bileşik özelliklerinin geniş kapsamlı bir açıklama sağlar. Bu scsistem reening ilaç sinerji 9 analizi de dahil olmak üzere etki modu hedef çeşitli bileşik kütüphaneleri, çeşitli projelerde kullanılmıştır, otofajinin 10 stimülasyonu ve M. tuberculosis inhibisyonu, hastalık oluşturma faktörü (yayınlanmamış) tarafından salgılanan. Eylem bilinmeyen modu bileşikleri ayrıca 11 incelenmiştir. Bu yöntemin bir tadil edilmiş bir versiyonu da, hücre içi, M. tuberculosis 11 karşı yeni bileşiklerin belirlenmesi için birinci tarama yöntemi olarak endüstriyel ortak tarafından kabul edilmiştir.

<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
	<tbody>
		<tr>
			<td>RPMI 1640</td>
			<td>Sigma-Aldrich</td>
			<td>R5886</td>
			<td></td>
		</tr>
		<tr>
			<td>L-glutamine</td>
			<td>Sigma-Aldrich</td>
			<td>G7513</td>
			<td></td>
		</tr>
		<tr>
			<td>Fetal bovine serum (FBS)</td>
			<td>Thermo Fisher Scientific</td>
			<td>12483020</td>
			<td></td>
		</tr>
		<tr>
			<td>Middlebrook 7H9</td>
			<td>Becton, Dickinson and Company</td>
			<td>271210</td>
			<td></td>
		</tr>
		<tr>
			<td>Tween80</td>
			<td>Fisher Scientific</td>
			<td>T164</td>
			<td></td>
		</tr>
		<tr>
			<td>Albumin, Bovine pH7</td>
			<td>Affymetrix</td>
			<td>10857</td>
			<td></td>
		</tr>
		<tr>
			<td>Dextrose</td>
			<td>Fisher Scientific</td>
			<td>BP350</td>
			<td></td>
		</tr>
		<tr>
			<td>Sodium Chloride</td>
			<td>Fisher Scientific</td>
			<td>BP358</td>
			<td></td>
		</tr>
		<tr>
			<td>kanamycin sulfate</td>
			<td>Fisher Scientific</td>
			<td>BP906</td>
			<td></td>
		</tr>
		<tr>
			<td>PMA</td>
			<td>Sigma-Aldrich</td>
			<td>P8139</td>
			<td></td>
		</tr>
		<tr>
			<td>MTT</td>
			<td>Sigma-Aldrich</td>
			<td>M2128</td>
			<td></td>
		</tr>
		<tr>
			<td>N,N-Dimethylformamide (DMF)</td>
			<td>Fisher Scientific</td>
			<td>D131</td>
			<td></td>
		</tr>
		<tr>
			<td>1M Hydrocholoric acid (HCl)</td>
			<td>Fisher Scientific</td>
			<td>351279212</td>
			<td></td>
		</tr>
		<tr>
			<td>Acetic acid</td>
			<td>Fisher Scientific</td>
			<td>351269</td>
			<td></td>
		</tr>
		<tr>
			<td>SDS</td>
			<td>Fisher Scientific</td>
			<td>BP166</td>
			<td></td>
		</tr>
		<tr>
			<td>Resazurin</td>
			<td>Alfa Aesar</td>
			<td>B21187</td>
			<td></td>
		</tr>
		<tr>
			<td>DMSO</td>
			<td>Sigma-Aldrich</td>
			<td>D5879</td>
			<td></td>
		</tr>
		<tr>
			<td>Glycerol</td>
			<td>Fisher Scientific</td>
			<td>BP229</td>
			<td></td>
		</tr>
		<tr>
			<td></td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>THP-1</td>
			<td>American Type Culture Collection</td>
			<td>TIB-202</td>
			<td></td>
		</tr>
		<tr>
			<td>M. tuberculosis H37Rv</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td></td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>96-well flat bottom white plate</td>
			<td>Corning</td>
			<td>3917</td>
			<td></td>
		</tr>
		<tr>
			<td>95-well flat bottom clear plate</td>
			<td>Corning</td>
			<td>3595</td>
			<td></td>
		</tr>
		<tr>
			<td>Transparent plate sealer</td>
			<td>Thermo Fisher Scientific</td>
			<td>AB-0580</td>
			<td></td>
		</tr>
		<tr>
			<td></td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Spectrophotometer</td>
			<td>Thermo Fisher Scientific</td>
			<td>Biomate 3</td>
			<td></td>
		</tr>
		<tr>
			<td>Microplate spectrophotometer</td>
			<td>Biotek</td>
			<td>Epoch</td>
			<td></td>
		</tr>
		<tr>
			<td>luminometer</td>
			<td>Applied Biosystems</td>
			<td>Tropix TR717</td>
			<td></td>
		</tr>
	</tbody>
</table>

system for efficacy and cytotoxicity screening of inhibitors targeting intracellular mycobacterium tuberculosis

Mycobacterium tuberculosis, the causative agent of tuberculosis (TB), is a leading cause of morbidity and mortality worldwide. With the increased spread of multi drug-resistant TB (MDR-TB), there is a real urgency to develop new therapeutic strategies against M. tuberculosis infections. Traditionally, compounds are evaluated based on their antibacterial activity under in vitro growth conditions in broth; however, results are often misleading for intracellular pathogens like M. tuberculosis since in-broth phenotypic screening conditions are significantly different from the actual disease conditions within the human body. Screening for inhibitors that work inside macrophages has been traditionally difficult due to the complexity, variability in infection, and slow replication rate of M. tuberculosis. In this study, we report a new approach to rapidly assess the effectiveness of compounds on the viability of M. tuberculosis in a macrophage infection model. Using a combination of a cytotoxicity assay and an in-broth M. tuberculosis viability assay, we were able to create a screening system that generates a comprehensive analysis of compounds of interest. This system is capable of producing quantitative data at a low cost that is within reach of most labs and yet is highly scalable to fit large industrial settings.

Lüsiferaz genini M. tüberküloz kullanan yüksek çıktılı hücre içi tarama Şekil 2A ve Tablo 1 luminometre ile toplanmış ham veriler, THP-1 hücreleri içinde M. tuberculosis ile TB ilaç rifampisin artan konsantrasyonunun etkisini gösteren, nispi ışık saçan birimleri (RLU) olarak ifade içerir. Şekil 2A, rifampisin, çeşitli konsantrasyonları ...

Watch this Scientific Journal Video about System for Efficacy and Cytotoxicity Screening of Inhibitors Targeting Intracellular Mycobacterium tuberculosis at JoVE.com

System for Efficacy and Cytotoxicity Screening of Inhibitors Targeting Intracellular Mycobacterium tuberculosis

Bu hücre içi, Mycobacterium tuberculosis karşısında roman bileşiklerin bulunması hedefleme için ve in suyu memeli konakçı hücreye karşı bakteri hem de sitotoksisite büyüyen modüler yüksek verimli bir tarama sistemini geliştirdik.

Hücre içi Hedefleme İnhibitörleri Etkinliği ve Sitotoksisite Taraması için sistem<em&gt; Mycobacterium tuberculosis</em

Mycobacterium tuberculosis, the causative agent of tuberculosis (TB), is a leading cause of morbidity and mortality worldwide. With the increased spread ...

system-for-efficacy-cytotoxicity-screening-inhibitors-targeting

Universidad de Cartagena UDEC

Research

JoVE Journal

Immunology and Infection

System for Efficacy and Cytotoxicity Screening of Inhibitors Targeting Intracellular Mycobacterium tuberculosis

8.5K Görüntüleme.  University of British Columbia.  Bu hücre içi, Mycobacterium tuberculosis karşısında roman bileşiklerin bulunması hedefleme için ve in suyu memeli konakçı hücreye karşı bakteri hem de sitotoksisite büyüyen modüler yüksek verimli bir tarama sistemini geliştirdik. 

Video: System for Efficacy and Cytotoxicity Screening of Inhibitors Targeting Intracellular Mycobacterium tuberculosis

Sample Preparation of Mycobacterium tuberculosis Extracts for Nuclear Magnetic Resonance Metabolomic Studies

Mycobacterium tuberculosis is a major cause of mortality in human beings on a global scale. The emergence of both multi- (MDR) and extensively-(XDR) drug-resistant strains threatens to derail current disease control efforts. Thus, there is an urgent need to develop drugs and vaccines that are more effective than those currently available. The genome of M. tuberculosis has been known for more than 10 years, yet there are important gaps in our knowledge of gene function and essentiality. Many studies have since used gene expression analysis at both the transcriptomic and proteomic levels to determine the effects of drugs, oxidants, and growth conditions on the global patterns of gene expression. Ultimately, the final response of these changes is reflected in the metabolic composition of the bacterium including a few thousand small molecular weight chemicals. Comparing the metabolic profiles of wild type and mutant strains, either untreated or treated with a particular drug, can effectively allow target identification and may lead to the development of novel inhibitors with anti-tubercular activity. Likewise, the effects of two or more conditions on the metabolome can also be assessed. Nuclear magnetic resonance (NMR) is a powerful technology that is used to identify and quantify metabolic intermediates. In this protocol, procedures for the preparation of M. tuberculosis cell extracts for NMR metabolomic analysis are described. Cell cultures are grown under appropriate conditions and required Biosafety Level 3 containment,1 harvested, and subjected to mechanical lysis while maintaining cold temperatures to maximize preservation of metabolites. Cell lysates are recovered, filtered sterilized, and stored at ultra-low temperatures. Aliquots from these cell extracts are plated on Middlebrook 7H9 agar for colony-forming units to verify absence of viable cells. Upon two months of incubation at 37 &deg;C, if no viable colonies are observed, samples are removed from the containment facility for downstream processing. Extracts are lyophilized, resuspended in deuterated buffer and injected in the NMR instrument, capturing spectroscopic data that is then subjected to statistical analysis. The procedures described can be applied for both one-dimensional (1D) 1H NMR and two-dimensional (2D) 1H-13C NMR analyses. This methodology provides more reliable small molecular weight metabolite identification and more reliable and sensitive quantitative analyses of cell extract metabolic compositions than chromatographic methods. Variations of the procedure described following the cell lysis step can also be adapted for parallel proteomic analysis.

Sample Preparation of Mycobacterium tuberculosis Extracts for Nuclear Magnetic Resonance Metabolomic Studies

The metabolomic profile of Mycobacterium tuberculosis is determined after growth in broth cultures. Conditions can be varied to test the effects of nutritional supplements, oxidants, and anti-tuberculosis agents on the metabolic profile of this microorganism. Procedure for extract preparation is applicable for both 1D 1H and 2D 1H-13C NMR analyses.

Numune Hazırlama<em&gt; Mycobacterium tuberculosis</emNükleer Manyetik Rezonans metabolomik Araştırmaları&gt; özler

Mycobacterium tuberculosis is a major cause of mortality in human beings on a global scale. The emergence of both multi- (MDR) and extensively-(XDR) ...

İmmünoloji ve Enfeksiyon

Growth of Mycobacterium tuberculosis Biofilms

Mycobacterium tuberculosis, the etiologic agent of human tuberculosis, has an extraordinary ability to survive against environmental stresses including antibiotics. Although stress tolerance of M. tuberculosis is one of the likely contributors to the 6-month long chemotherapy of tuberculosis 1, the molecular mechanisms underlying this characteristic phenotype of the pathogen remain unclear. Many microbial species have evolved to survive in stressful environments by self-assembling in highly organized, surface attached, and matrix encapsulated structures called biofilms 2-4. Growth in communities appears to be a preferred survival strategy of microbes, and is achieved through genetic components that regulate surface attachment, intercellular communications, and synthesis of extracellular polymeric substances (EPS) 5,6. The tolerance to environmental stress is likely facilitated by EPS, and perhaps by the physiological adaptation of individual bacilli to heterogeneous microenvironments within the complex architecture of biofilms 7.
In a series of recent papers we established that M. tuberculosis and Mycobacterium smegmatis have a strong propensity to grow in organized multicellular structures, called biofilms, which can tolerate more than 50 times the minimal inhibitory concentrations of the anti-tuberculosis drugs isoniazid and rifampicin 8-10. M. tuberculosis, however, intriguingly requires specific conditions to form mature biofilms, in particular 9:1 ratio of headspace: media as well as limited exchange of air with the atmosphere 9. Requirements of specialized environmental conditions could possibly be linked to the fact that M. tuberculosis is an obligate human pathogen and thus has adapted to tissue environments. In this publication we demonstrate methods for culturing M. tuberculosis biofilms in a bottle and a 12-well plate format, which is convenient for bacteriological as well as genetic studies. We have described the protocol for an attenuated strain of M. tuberculosis, mc27000, with deletion in the two loci, panCD and RD1, that are critical for in vivo growth of the pathogen 9. This strain can be safely used in a BSL-2 containment for understanding the basic biology of the tuberculosis pathogen thus avoiding the requirement of an expensive BSL-3 facility. The method can be extended, with appropriate modification in media, to grow biofilm of other culturable mycobacterial species.
Overall, a uniform protocol of culturing mycobacterial biofilms will help the investigators interested in studying the basic resilient characteristics of mycobacteria. In addition, a clear and concise method of growing mycobacterial biofilms will also help the clinical and pharmaceutical investigators to test the efficacy of a potential drug.

Growth of Mycobacterium tuberculosis Biofilms

Mycobacterium tuberculosis forms drug tolerant biofilms when cultured in certain conditions. Here we describe methods for culturing M. tuberculosis biofilms and determining the frequency of drug tolerant persisters. These protocols will be useful for further studies into the mechanisms of drug tolerance in M. tuberculosis.

Büyüme Mycobacterium tuberculosis Biyofilmler

Mycobacterium tuberculosis, the etiologic agent of human tuberculosis, has an extraordinary ability to survive against environmental stresses including ...

An Experimental Model to Study Tuberculosis-Malaria Coinfection upon Natural Transmission of Mycobacterium tuberculosis and Plasmodium berghei

Coinfections naturally occur due to the geographic overlap of distinct types of pathogenic organisms. Concurrent infections most likely modulate the respective immune response to each single pathogen and may thereby affect pathogenesis and disease outcome. Coinfected patients may also respond differentially to anti-infective interventions. Coinfection between tuberculosis as caused by mycobacteria and the malaria parasite Plasmodium, both of which are coendemic in many parts of sub-Saharan Africa, has not been studied in detail. In order to approach the challenging but scientifically and clinically highly relevant question how malaria-tuberculosis coinfection modulate host immunity and the course of each disease, we established an experimental mouse model that allows us to dissect the elicited immune responses to both pathogens in the coinfected host. Of note, in order to most precisely mimic naturally acquired human infections, we perform experimental infections of mice with both pathogens by their natural routes of infection, i.e. aerosol and mosquito bite, respectively.

An Experimental Model to Study Tuberculosis-Malaria Coinfection upon Natural Transmission of Mycobacterium tuberculosis and Plasmodium berghei

Tuberculosis and malaria are two of the most prevalent infections in humans and major causes of morbidity and mortality in impoverished populations in the tropics. We established an experimental model system to study outcome of malaria-tuberculosis coinfection in mice after challenge with both pathogens via their natural route of infection.

Doğal İletim üzerine Tüberküloz-Sıtma Koenfeksiyonu Çalışması için Deneysel Bir Model Mycobacterium tuberculosis Ve Plasmodium berghei</i

Coinfections naturally occur due to the geographic overlap of distinct types of pathogenic organisms. Concurrent infections most likely modulate the ...

High-throughput Screening for Broad-spectrum Chemical Inhibitors of RNA Viruses

RNA viruses are responsible for major human diseases such as flu, bronchitis, dengue, Hepatitis C or measles. They also represent an emerging threat because of increased worldwide exchanges and human populations penetrating more and more natural ecosystems. A good example of such an emerging situation is chikungunya virus epidemics of 2005-2006 in the Indian Ocean. Recent progresses in our understanding of cellular pathways controlling viral replication suggest that compounds targeting host cell functions, rather than the virus itself, could inhibit a large panel of RNA viruses. Some broad-spectrum antiviral compounds have been identified with host target-oriented assays. However, measuring the inhibition of viral replication in cell cultures using reduction of cytopathic effects as a readout still represents a paramount screening strategy. Such functional screens have been greatly improved by the development of recombinant viruses expressing reporter enzymes capable of bioluminescence such as luciferase. In the present report, we detail a high-throughput screening pipeline, which combines recombinant measles and chikungunya viruses with cellular viability assays, to identify compounds with a broad-spectrum antiviral profile.

In vitro assays to measure virus replication have been greatly improved by the development of recombinant RNA viruses expressing luciferase or other enzymes capable of bioluminescence. Here we detail a high-throughput screening pipeline that combines such recombinant strains of measles and chikungunya viruses to isolate broad-spectrum antivirals from chemical libraries.

RNA Virüslerinin geniş spektrumlu Kimyasal Önleyicileri için yüksek verimli tarama

RNA viruses are responsible for major human diseases such as flu, bronchitis, dengue, Hepatitis C or measles. They also represent an emerging threat ...

Demonstrating a Multi-drug Resistant Mycobacterium tuberculosis Amplification Microarray

Simplifying microarray workflow is a necessary first step for creating MDR-TB microarray-based diagnostics that can be routinely used in lower-resource environments. An amplification microarray combines asymmetric PCR amplification, target size selection, target labeling, and microarray hybridization within a single solution and into a single microfluidic chamber. A batch processing method is demonstrated with a 9-plex asymmetric master mix and low-density gel element microarray for genotyping multi-drug resistant Mycobacterium tuberculosis (MDR-TB). The protocol described here can be completed in 6 hr and provide correct genotyping with at least 1,000 cell equivalents of genomic DNA. Incorporating on-chip wash steps is feasible, which will result in an entirely closed amplicon method and system. The extent of multiplexing with an amplification microarray is ultimately constrained by the number of primer pairs that can be combined into a single master mix and still achieve desired sensitivity and specificity performance metrics, rather than the number of probes that are immobilized on the array. Likewise, the total analysis time can be shortened or lengthened depending on the specific intended use, research question, and desired limits of detection. Nevertheless, the general approach significantly streamlines microarray workflow for the end user by reducing the number of manually intensive and time-consuming processing steps, and provides a simplified biochemical and microfluidic path for translating microarray-based diagnostics into routine clinical practice.

Demonstrating a Multi-drug Resistant Mycobacterium tuberculosis Amplification Microarray

An amplification microarray combines asymmetric PCR amplification and microarray hybridization into a single chamber, which significantly streamlines microarray workflow for the end user. Simplifying microarray workflow is a necessary first step for creating microarray-based diagnostics that can be routinely used in lower-resource environments.

Çok ilaca dirençli Demonstrating<em&gt; Mycobacterium tuberculosis</em&gt; Amplifikasyon Microarray

Simplifying microarray workflow is a necessary first step for creating MDR-TB microarray-based diagnostics that can be routinely used in lower-resource ...

Rapid Screening of HIV Reverse Transcriptase and Integrase Inhibitors

Although a number of anti HIV drugs have been approved, there are still problems with toxicity and drug resistance. This demonstrates a need to identify new compounds that can inhibit infection by the common drug resistant HIV-1 strains with minimal toxicity. Here we describe an efficient assay that can be used to rapidly determine the cellular cytotoxicity and efficacy of a compound against WT and mutant viral strains.
The desired target cell line is seeded in a 96-well plate and, after a 24 hr incubation, serially dilutions of the compounds to be tested are added. No further manipulations are necessary for cellular cytotoxicity assays; for anti HIV assays a predetermined amount of either a WT or drug resistant HIV-1 vector that expresses luciferase is added to the cells. Cytotoxicity is measured by using an ATP dependent luminescence assay and the impact of the compounds on infectivity is measured by determining the amount of luciferase in the presence or the absence of the putative inhibitors.
This screening assay takes 4 days to complete and multiple compounds can be screened in parallel. Compounds are screened in triplicate and the data are normalized to the infectivity/ATP levels in absence of target compounds. This technique provides a quick and accurate measurement of the efficacy and toxicity of potential anti HIV compounds.

Here we describe cellular cytotoxicity and single round infectivity assays that allow for the rapid and accurate screening of compounds to determine their cellular cytotoxicity (CC50) and IC50 values against WT and drug resistant HIV-1.

HIV ters transkriptaz ve integraz inhibitörleri hızlı taranması

Although a number of anti HIV drugs have been approved, there are still problems with toxicity and drug resistance. This demonstrates a need to identify ...

A 3D Human Lung Tissue Model for Functional Studies on Mycobacterium tuberculosis Infection

Tuberculosis (TB) still holds a major threat to the health of people worldwide, and there is a need for cost-efficient but reliable models to help us understand the disease mechanisms and advance the discoveries of new treatment options. In vitro cell cultures of monolayers or co-cultures lack the three-dimensional (3D) environment and tissue responses. Herein, we describe an innovative in vitro model of a human lung tissue, which holds promise to be an effective tool for studying the complex events that occur during infection with Mycobacterium tuberculosis (M. tuberculosis). The 3D tissue model consists of tissue-specific epithelial cells and fibroblasts, which are cultured in a matrix of collagen on top of a porous membrane. Upon air exposure, the epithelial cells stratify and secrete mucus at the apical side. By introducing human primary macrophages infected with M. tuberculosis to the tissue model, we have shown that immune cells migrate into the infected-tissue and form early stages of TB granuloma. These structures recapitulate the distinct feature of human TB, the granuloma, which is fundamentally different or not commonly observed in widely used experimental animal models. This organotypic culture method enables the 3D visualization and robust quantitative analysis that provides pivotal information on spatial and temporal features of host cell-pathogen interactions. Taken together, the lung tissue model provides a physiologically relevant tissue micro-environment for studies on TB. Thus, the lung tissue model has potential implications for both basic mechanistic and applied studies. Importantly, the model allows addition or manipulation of individual cell types, which thereby widens its use for modelling a variety of infectious diseases that affect the lungs.

A 3D Human Lung Tissue Model for Functional Studies on Mycobacterium tuberculosis Infection

Human tuberculosis infection is a complex process, which is difficult to model in vitro. Here we describe a novel 3D human lung tissue model that recapitulates the dynamics that occur during infection, including the migration of immune cells and early granuloma formation in a physiological environment.

Fonksiyonel Araştırmaları 3D İnsan Akciğer Doku Modeli<em&gt; Mycobacterium tuberculosis</em&gt; Enfeksiyon

Tuberculosis (TB) still holds a major threat to the health of people worldwide, and there is a need for cost-efficient but reliable models to help us ...

A High-throughput Compatible Assay to Evaluate Drug Efficacy against Macrophage Passaged Mycobacterium tuberculosis

The early drug development process for anti-tuberculosis drugs is hindered by the inefficient translation of compounds with in vitro activity to effectiveness in the clinical setting. This is likely due to a lack of consideration for the physiologically relevant cellular penetration barriers that exist in the infected host. We recently established an alternative infection model that generates large macrophage aggregate structures containing densely packed M. tuberculosis (Mtb) at its core, which was suitable for drug susceptibility testing. This infection model is inexpensive, rapid, and most importantly BSL-2 compatible. Here, we describe the experimental procedures to generate Mtb/macrophage aggregate structures that would produce macrophage-passaged Mtb for drug susceptibility testing. In particular, we demonstrate how this infection system could be directly adapted to the 96-well plate format showing throughput capability for the screening of compound libraries against Mtb. Overall, this assay is a valuable addition to the currently available Mtb drug discovery toolbox due to its simplicity, cost effectiveness, and scalability.

A High-throughput Compatible Assay to Evaluate Drug Efficacy against Macrophage Passaged Mycobacterium tuberculosis

New models and assays that would improve the early drug development process for next-generation anti-tuberculosis drugs are highly desirable. Here, we describe a quick, inexpensive, and BSL-2 compatible assay to evaluate drug efficacy against Mycobacterium tuberculosis that can be easily adapted for high-throughput screening.

Bir Yüksek verim Uyumlu Deneyi Makrofaj, pasajlamaya karşı ilaç etkinliğini değerlendirmektir<em&gt; Mycobacterium tuberculosis</em

The early drug development process for anti-tuberculosis drugs is hindered by the inefficient translation of compounds with in vitro activity to ...

Imaging Mycobacterium tuberculosis in Mice with Reporter Enzyme Fluorescence

Reporter enzyme fluorescence (REF) utilizes substrates that are specific for enzymes present in target organisms of interest for imaging or detection by fluorescence or bioluminescence. We utilize BlaC, an enzyme expressed constitutively by all M. tuberculosis strains. REF allows rapid quantification of bacteria in lungs of infected mice. The same group of mice can be imaged at many time points, greatly reducing costs, enumerating bacteria more quickly, allowing novel observations in host-pathogen interactions, and increasing statistical power, since more animals per group are readily maintained. REF is extremely sensitive due to the catalytic nature of the BlaC enzymatic reporter and specific due to the custom flourescence resonance energy transfer (FRET) or fluorogenic substrates used. REF does not require recombinant strains, ensuring normal host-pathogen interactions. We describe the imaging of M. tuberculosis infection using a FRET substrate with maximal emission at 800 nm. The wavelength of the substrate allows sensitive deep tissue imaging in mammals. We will outline aerosol infection of mice with M. tuberculosis, anesthesia of mice, administration of the REF substrate, and optical imaging. This method has been successfully applied to evaluating host-pathogen interactions and efficacy of antibiotics targeting M. tuberculosis.

Imaging Mycobacterium tuberculosis in Mice with Reporter Enzyme Fluorescence

We describe the optical imaging of mice infected with Mycobacterium tuberculosis (M. tuberculosis) using reporter enzyme fluorescence (REF). This protocol facilitates the sensitive and specific detection of M. tuberculosis in pre-clinical animal models for pathogenesis, therapeutics and vaccine research.

Mycobacterium tüberküloz ile muhabir enzim Floresans farelerde görüntüleme

Reporter enzyme fluorescence (REF) utilizes substrates that are specific for enzymes present in target organisms of interest for imaging or detection by ...

Identification of Virulence Markers of Mycobacterium abscessus for Intracellular Replication in Phagocytes

What differentiates Mycobacterium abscessus from other saprophytic mycobacteria is the ability to resist phagocytosis by human macrophages and the ability to multiply inside such cells. These virulence traits render M. abscessus pathogenic, especially in vulnerable hosts with underlying structural lung disease, such as cystic fibrosis, bronchiectasis or tuberculosis. How patients become infected with M. abscessus remains unclear. Unlike many mycobacteria, M. abscessus is not found in the environment but might reside inside amoebae, environmental phagocytes that represent a potential reservoir for M. abscessus. Indeed, M. abscessus is resistant to amoebal phagocytosis and the intra-amoeba life seems to increase M. abscessus virulence in an experimental model of infection. However, little is known about M. abscessus virulence in itself. To decipher the genes conferring an advantage to M. abscessus intracellular life, a screening of a M. abscessus transposon mutant library was developed. In parallel, a method of RNA extraction from intracellular Mycobacteria after co-culture with amoebae was developed. This method was validated and allowed the sequencing of whole M. abscessus transcriptomes inside the cells; providing, for the first time, a global view on M. abscessus adaptation to intracellular life. Both approaches give us an insight into M. abscessus virulence factors that enable M. abscessus to colonize the airways in humans.

Identification of Virulence Markers of Mycobacterium abscessus for Intracellular Replication in Phagocytes

Here, we present two protocols to study Phagocyte-Mycobacterium abscessus interactions: the screening of a transposon mutant library for bacterial intracellular deficiency and the determination of bacterial intracellular transcriptome from RNA sequencing. Both approaches provide insight into the genomic advantages and transcriptomic adaptations enhancing intracellular bacteria fitness.

Mycobacterium abscessus virülans işaretleri tanımlaması fagositler hücre içi çoğaltma için

What differentiates Mycobacterium abscessus from other saprophytic mycobacteria is the ability to resist phagocytosis by human macrophages and the ability ...

Hücre içi Hedefleme İnhibitörleri Etkinliği ve Sitotoksisite Taraması için sistem

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Bir Yüksek verim Uyumlu Deneyi Makrofaj, pasajlamaya karşı ilaç etkinliğini değerlendirmektir

Mycobacterium tüberküloz ile muhabir enzim Floresans farelerde görüntüleme

Mycobacterium abscessus virülans işaretleri tanımlaması fagositler hücre içi çoğaltma için