저자는 도움이 토론에 대한 각각 tdTomato와 사비의 발현을 허용 pTEC27과 pTEC15의 관대 한 선물을 사러 - 클로드과 L. 라마 크리슈를 제공하는 케이 Kissa에 감사드립니다. 프랑스 국립 연구 기관의 프로젝트 (ZebraFlam ANR-10-MIDI-009과 DIMYVIR ANR-13-BSV3-007-01) 및 유럽 공동체의 일곱 번째 프레임 워크 프로그램의이 작품의 일부를 형성 (FP7-사람들-2011-ITN) 부여 계약에 따라 NO. PITN-GA-2011-289209 마리 퀴리 초기 교육 네트워크 FishForPharma합니다. 우리는 CM 듀폰에 자금을 지원하기위한 협회 그레고리 Lemarchal 및 Vaincre 라 Mucoviscidose (RF20130500835)을 감사하는 것이 좋겠다.

The authors have nothing to disclose.

제브라 피쉬는 최근 실시간 (36)의 넓은 필드와 공 촛점 이미징을 사용하여 세균 감염의 역학을 공부하는 우수한 척추 동물 모델 시스템으로 떠오르고있다. 함께 마이크로 주입 방법 (프로토콜 4)와 분산 마이코 박테리아 현탁액 (프로토콜 2.2)의 조합은 재현 전신 감염, 후속 모니터링 및 호스트 식세포와 세균의 상호 작용에 특별한 초점을 맞춘 감염의 진행의 시각화 할 수 있습니다. 엠...

미코 농양은 인간의 임상 증후군의 넓은 스펙트럼을 일으키는 새로운 병원균이다. 이러한 피부 감염뿐만 아니라 심각한 만성 폐 감염, 주로 면역 및 낭포 성 섬유증 환자 1,2,3,4에서 발생을 포함한다. M.를 농양은 인간의 원내 및 인성 감염을 담당하는 주요 빠르게 성장하는 마이코 박테리아 종으로 간주된다. 또한, 몇 가지 최근의 보고서는 가능성을 강조하는 M. 농양은 혈액 - 뇌 장벽을 통과하여 중추 신경계 (CNS) 5,6- 중요한 병변을 유도 할 수있다. 빠른 재배자, M.를 임에도 불구하고 또한 농양 전시 육아 종성 구조 내에서 년 동안 묵비권과 폐 7 caseous 병변을 생성 할 수있는 능력을 포함하여 결핵균의 그와 관련된 여러 가지 병원성 기능. 더 놀라운 낮은 센입니다엠의 sitivity 항생제에 농양, 상당한 치료 실패율 8,9로 이어지는 치료하기가 매우 어렵습니다 이러한 감염을 렌더링. 이 종의 중요한 위협은 주로 주요 공중 보건 기관 (10)에 관심과 폐 이식 (11)에 대한 금기 사항이다 항생제에 고유의 저항이다. M. 농양 표시 다른 임상 결과로 이어질 부드러운 (S) 또는 거친 (R) 식민지 형태 형. S 균주 달리, R 박테리아 로프 또는 끈형 구조 (12, 13)로 이어지는 단으로 성장하는 경향이있다. 세포 또는 동물 중 모델을 기반으로 여러 독립적 인 연구는 연구의 하이퍼 독성 표현형은 14, 15를 morphotype 밝혔다. 역학 연구, M.의 가장 심각한 경우 가입일 농양, 폐 감염이 연구와 관련이있는 것으로 나타납니다하는 유일한 변형 16 개의 변종이감염된 호스트 3 년 동안 지속하는 것으로 나타났습니다. morphotype 차이는 표면 관련 glycopeptidolipids (GPL) 12 (S)에 존재 또는 (R)에서 손실에 의존한다. 그러나, 현재 이용 가능한 셀룰러 / 동물 모델의 본질적인 한계는 M.에 의한 연구를 사용 농양 감염, R 또는 S 변종의 병태 생리 학적 사건에 대한 우리의 지식은 불분명 남아있다. 정맥 또는 에어로졸 경로를 통해 면역 능력이 쥐의 감염은 지속적 감염 및 생체 내 약물 감수성 검사 (17)에 대해 연구하는 마우스의 사용을 방해, 일시적 식민지로 연결됩니다. 따라서, 호스트 응답의 조작 의무가 동물 모델을 개발하는 것은 큰 도전이다. 이러한 맥락에서, 감염의 포유 동물 모델 비는 비용, 속도 및 윤리적 양호성 O 등 여러 가지 이점을 제공한다 (18)를 포함 초파리 melanogaster의 최근 개발되어왔다마우스 모델을 VER. 감염의 제브라 피쉬 (다니오 레 리오 (rerio)) 모델은 또한 비 침습적 영상, M.의 진행과 연대하여, 시각적으로 탐구하고있다 살아있는 동물 19 농양 감염. 중요한 개념의 증거는 엠에 대한 생체 내 항생제 평가에 대한 적합성을 입증하기 위해 설립되었다 17, 20 농양. 제브라 널리 다양한 병원균과 숙주 면역 시스템 (21) 사이의 상호 작용을 연구하기 위해 지난 수십 년 동안 사용되어왔다. 이 다른 척추 동물 모델의 증가 성공 동기 부여 및 다수의 바이러스와 세균 감염 19,22,23,24,25,26,27,28,29의 더 나은 이해를 위해 사용을 검증 주요 독특한 기회에 의존합니다. 대부분의 다른 동물 모델에 반해, 제브라 피쉬 배아는 비 침습적 형광 이미징 (30). 이는 헥타르 있도록 광학적으로 투명M. 공부를 LED에 농양은 세균의 형태 학적 가소성의 예를 나타내는 세포 외 cording의 설명과 남중, 전례없는 세부 제브라 피쉬 배아를 감염. Cording는 면역 체계의 파괴의 새로운 메커니즘 및 급성 엠의 발병을 촉진하는 핵심 메커니즘을 나타냅니다 농양 감염 (19). 이 보고서는 M.의 병태 생리 학적 특성을 해독하는 제브라 피쉬 배아를 사용하는 새로운 도구와 방법을 설명합니다 감염 농양과 간균과 선천성 면역 시스템 사이의 친밀한 상호 작용을 연구하는. 먼저, 그 자체 박테리아 접종원 배아 준비, 감염의 처리를 포함하는 마이크로 인젝션 상세한 프로토콜이 제시된다. 구체적 방법은 M.를 평가하도록 같은 호스트의 생존과 세균 부담 등의 다양한 매개 변수를 측정하여 농양 독성이되게됩니다. 특별한 초점은 방법에 기재되어 있습니다, 시공간 수준에서, 운명과 진행 감염과 엠에 호스트 면역 반응을 모니터링 비디오 현미경을 사용하여 농양. 또한, M. 동안의 기여와 대 식세포의 역할을 조사하기 위해 감염 농양, 방법 (genetically- 또는 화학적 기반 중 하나 방법을 사용) 대 식세포가 고갈 된 배아 설명되어 있습니다를 생성합니다. 마지막으로, 프로토콜은 고정 또는 생활 배아를 사용하여 대 식세포 나 호중구가 문서화와 특정 상호 작용을 시각화합니다. 이 보고서의 목적은 엠에 새로운 광명을 비춰하는 추가 연구를 자극하는 것입니다 농양 독성 메커니즘 및 제어되지 않은 급성 감염 프로세스의 확립에 cording 특히 역할.

<table border="0" cellpadding="0" cellspacing="0">
	<tbody>
		<tr>
			<td>BBL MGIT PANTA</td>
			<td>BD Biosciences</td>
			<td>245114</td>
			<td></td>
		</tr>
		<tr>
			<td>Bovine Serum Albumin&#160;</td>
			<td>Euromedex</td>
			<td>04-100-811-E</td>
			<td></td>
		</tr>
		<tr>
			<td>Catalase from Bovine Liver&#160;</td>
			<td>Sigma-Aldrich</td>
			<td>C40</td>
			<td></td>
		</tr>
		<tr>
			<td>Difco Middlebrook 7H10 Agar</td>
			<td>BD Biosciences</td>
			<td>262710</td>
			<td></td>
		</tr>
		<tr>
			<td>Difco Middlebrook 7H9 Broth</td>
			<td>BD Biosciences</td>
			<td>271310</td>
			<td></td>
		</tr>
		<tr>
			<td>Ethyl 3-aminobenzoate methanesulfonate salt (Tricaine)</td>
			<td>Sigma-Aldrich</td>
			<td>A5040</td>
			<td></td>
		</tr>
		<tr>
			<td>Oleic Acid</td>
			<td>Sigma-Aldrich</td>
			<td>O1008</td>
			<td></td>
		</tr>
		<tr>
			<td>Paraformaldehyde</td>
			<td>Delta Microscopie</td>
			<td>15710</td>
			<td></td>
		</tr>
		<tr>
			<td>Phenol Red</td>
			<td>Sigma-Aldrich</td>
			<td>319244</td>
			<td></td>
		</tr>
		<tr>
			<td>Tween 80</td>
			<td>Sigma-Aldrich</td>
			<td>P4780</td>
			<td></td>
		</tr>
		<tr>
			<td>Agar</td>
			<td>Gibco Life Technologie</td>
			<td>30391-023</td>
			<td></td>
		</tr>
		<tr>
			<td>Low melting agarose</td>
			<td>Sigma-Aldrich</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Instant Ocean Sea Salts&#160;</td>
			<td>Aquarium Systems Inc</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Borosilicate glass capillaries&#160;</td>
			<td>Sutter instrument Inc</td>
			<td>BF100-78-10</td>
			<td>1mm O.D. X 0.78 mm I.D.</td>
		</tr>
		<tr>
			<td>Micropipette puller device&#160;</td>
			<td>Sutter Instrument Inc</td>
			<td></td>
			<td>Flamming/Brown Micropipette Puller p-87</td>
		</tr>
		<tr>
			<td>Microinjector</td>
			<td>Tritech Research&#160;</td>
			<td></td>
			<td>Digital microINJECTOR, MINJ-D</td>
		</tr>
		<tr>
			<td>Tweezers</td>
			<td>Sciences Tools inc</td>
			<td></td>
			<td>Dumont # M5S&#160;</td>
		</tr>
		<tr>
			<td>Microloader Tips</td>
			<td>Eppendorf</td>
			<td></td>
			<td></td>
		</tr>
	</tbody>
</table>

deciphering and imaging pathogenesis and cording of mycobacterium abscessus in zebrafish embryos

Zebrafish (Danio rerio) embryos are increasingly used as an infection model to study the function of the vertebrate innate immune system in host-pathogen interactions.&#160;The ease of obtaining large numbers of embryos, their accessibility due to external development, their optical transparency as well as the availability of a wide panoply of genetic/immunological tools and transgenic reporter line collections, contribute to the versatility of this model.&#160;In this respect, the present manuscript describes the use of zebrafish as an&#160;in vivo&#160;model system to investigate the chronology of Mycobacterium abscessus infection. This human pathogen can exist either as smooth (S) or rough (R) variants, depending on cell wall composition, and their respective virulence can be imaged and compared in zebrafish embryos and larvae. Micro-injection of either S or R fluorescent variants directly in the blood circulation via the caudal vein, leads to chronic or acute/lethal infections, respectively. This biological system allows high resolution visualization and analysis of the role of mycobacterial cording in promoting abscess formation. In addition, the use of fluorescent bacteria along with transgenic zebrafish lines harbouring fluorescent macrophages produces a unique opportunity for multi-color imaging of the host-pathogen interactions. This article describes detailed protocols for the preparation of homogenous M. abscessus inoculum and for intravenous injection of zebrafish embryos for subsequent fluorescence imaging of the interaction with macrophages. These techniques open the avenue to future investigations involving mutants defective in cord formation and are dedicated to understand how this impacts on M. abscessus pathogenicity in a whole vertebrate.

다양한 해부학 적 부위 (32)를 주입 할 수 있지만, 꼬리 정맥 주사는 종종 생존 실험 세균 부담 결정, 식세포 작용 활성 또는 코드를 포함하여 형성 후속 분석을위한 전신 감염을 생성하는 데 사용된다. 꼬리 근육 주사 주입 (그림 3A)의 사이트에있는 대 식세포의 모집을 평가하는 데 사용됩니다. 조사 엠의 R과 S 변종의 독성을 비교하려면 농양, 형광 박테리아 현탁?...

Watch this Scientific Journal Video about Deciphering and Imaging Pathogenesis and Cording of Mycobacterium abscessus in Zebrafish Embryos at JoVE.com

Deciphering and Imaging Pathogenesis and Cording of Mycobacterium abscessus in Zebrafish Embryos

Optically transparent zebrafish embryos are widely used to study and visualize in real time the interactions between pathogenic microorganisms and the innate immune cells. Micro-injection of Mycobacterium abscessus, combined with fluorescence imaging, is used to scrutinize essential pathogenic features such as cord formation in zebrafish embryos.

영상 병인과의 Cording를 해독하고<em&gt; 미코 농양</em&gt; Zebrafish의 배아에서

Zebrafish (Danio rerio) embryos are increasingly used as an infection model to study the function of the vertebrate innate immune system in host-pathogen ...

deciphering-imaging-pathogenesis-cording-mycobacterium-abscessus

Universidad de Cartagena UDEC

Research

JoVE Journal

Immunology and Infection

Deciphering and Imaging Pathogenesis and Cording of Mycobacterium abscessus in Zebrafish Embryos

10.1K 조회수.  Université Montpellier. Optically transparent zebrafish embryos are widely used to study and visualize in real time the interactions between pathogenic microorganisms and the innate immune cells. Micro-injection of Mycobacterium abscessus, combined with fluorescence imaging, is used to scrutinize essential pathogenic features such as cord formation in zebrafish embryos. 

비디오: Deciphering and Imaging Pathogenesis and Cording of Mycobacterium abscessus in Zebrafish Embryos

Imaging of HIV-1 Envelope-induced Virological Synapse and Signaling on Synthetic Lipid Bilayers

Human immunodeficiency virus type 1 (HIV-1) infection occurs most efficiently via cell to cell transmission2,10,11. This cell to cell transfer between CD4+ T cells involves the formation of a virological synapse (VS), which is an F-actin-dependent cell-cell junction formed upon the engagement of HIV-1 envelope gp120 on the infected cell with CD4 and the chemokine receptor (CKR) CCR5 or CXCR4 on the target cell 8. In addition to gp120 and its receptors, other membrane proteins, particularly the adhesion molecule LFA-1 and its ligands, the ICAM family, play a major role in VS formation and virus transmission as they are present on the surface of virus-infected donor cells and target cells, as well as on the envelope of HIV-1 virions1,4,5,6,7,13. VS formation is also accompanied by intracellular signaling events that are transduced as a result of gp120-engagement of its receptors. Indeed, we have recently showed that CD4+ T cell interaction with gp120 induces recruitment and phosphorylation of signaling molecules associated with the TCR signalosome including Lck, CD3&zeta;, ZAP70, LAT, SLP-76, Itk, and PLC&gamma;15.
In this article, we present a method to visualize supramolecular arrangement and membrane-proximal signaling events taking place during VS formation. We take advantage of the glass-supported planar bi-layer system as a reductionist model to represent the surface of HIV-infected cells bearing the viral envelope gp120 and the cellular adhesion molecule ICAM-1. The protocol describes general procedures for monitoring HIV-1 gp120-induced VS assembly and signal activation events that include i) bi-layer preparation and assembly in a flow cell, ii) injection of cells and immunofluorescence staining to detect intracellular signaling molecules on cells interacting with HIV-1 gp120 and ICAM-1 on bi-layers, iii) image acquisition by TIRF microscopy, and iv) data analysis. This system generates high-resolution images of VS interface beyond that achieved with the conventional cell-cell system as it allows detection of distinct clusters of individual molecular components of VS along with specific signaling molecules recruited to these sub-domains.

This article describes a method to visualize formation of an HIV-1 envelope-induced virological synapse on glass supported planar bilayers by total internal reflection fluorescence (TIRF) microscopy. The method can also be combined with immunofluorescence staining to detect activation and redistribution of signaling molecules that occur during HIV-1 envelope-induced virological synapse formation.

의 이미징 HIV-1 봉투 유발 Virological 시냅스와 합성 지질 Bilayers에 신호

Human immunodeficiency virus type 1 (HIV-1) infection occurs most efficiently via cell to cell transmission2,10,11. This cell to cell transfer between ...

연구

면역학 및 감염병학

Infection of Zebrafish Embryos with Intracellular Bacterial Pathogens

Zebrafish (Danio rerio) embryos are increasingly used as a model for studying the function of the vertebrate innate immune system in host-pathogen interactions 1. The major cell types of the innate immune system, macrophages and neutrophils, develop during the first days of embryogenesis prior to the maturation of lymphocytes that are required for adaptive immune responses. The ease of obtaining large numbers of embryos, their accessibility due to external development, the optical transparency of embryonic and larval stages, a wide range of genetic tools, extensive mutant resources and collections of transgenic reporter lines, all add to the versatility of the zebrafish model. Salmonella enterica serovar Typhimurium (S. typhimurium) and Mycobacterium marinum can reside intracellularly in macrophages and are frequently used to study host-pathogen interactions in zebrafish embryos. The infection processes of these two bacterial pathogens are interesting to compare because S. typhimurium infection is acute and lethal within one day, whereas M. marinum infection is chronic and can be imaged up to the larval stage 2, 3. The site of micro-injection of bacteria into the embryo (Figure 1) determines whether the infection will rapidly become systemic or will initially remain localized. A rapid systemic infection can be established by micro-injecting bacteria directly into the blood circulation via the caudal vein at the posterior blood island or via the Duct of Cuvier, a wide circulation channel on the yolk sac connecting the heart to the trunk vasculature. At 1 dpf, when embryos at this stage have phagocytically active macrophages but neutrophils have not yet matured, injecting into the blood island is preferred. For injections at 2-3 dpf, when embryos also have developed functional (myeloperoxidase-producing) neutrophils, the Duct of Cuvier is preferred as the injection site. To study directed migration of myeloid cells towards local infections, bacteria can be injected into the tail muscle, otic vesicle, or hindbrain ventricle 4-6. In addition, the notochord, a structure that appears to be normally inaccessible to myeloid cells, is highly susceptible to local infection 7. A useful alternative for high-throughput applications is the injection of bacteria into the yolk of embryos within the first hours after fertilization 8. Combining fluorescent bacteria and transgenic zebrafish lines with fluorescent macrophages or neutrophils creates ideal circumstances for multi-color imaging of host-pathogen interactions. This video article will describe detailed protocols for intravenous and local infection of zebrafish embryos with S. typhimurium or M. marinum bacteria and for subsequent fluorescence imaging of the interaction with cells of the innate immune system.

Transparent zebrafish embryos have proved useful model hosts to visualize and functionally study interactions between innate immune cells and intracellular bacterial pathogens, such as Salmonella typhimurium and Mycobacterium marinum. Micro-injection of bacteria and multi-color fluorescence imaging are essential techniques involved in the application of zebrafish embryo infection models.

세포내 세균성 병원균과 Zebrafish 태아의 감염

Zebrafish (Danio rerio) embryos are increasingly used as a model for studying the function of the vertebrate innate immune system in host-pathogen ...

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.

의 성장 결핵은 Mycobacterium Biofilms

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

Non-invasive Imaging of Disseminated Candidiasis in Zebrafish Larvae

Disseminated candidiasis caused by the pathogen Candida albicans is a clinically important problem in hospitalized individuals and is associated with a 30 to 40% attributable mortality6. Systemic candidiasis is normally controlled by innate immunity, and individuals with genetic defects in innate immune cell components such as phagocyte NADPH oxidase are more susceptible to candidemia7-9. Very little is known about the dynamics of C. albicans interaction with innate immune cells in vivo. Extensive in vitro studies have established that outside of the host C. albicans germinates inside of macrophages, and is quickly destroyed by neutrophils10-14. In vitro studies, though useful, cannot recapitulate the complex in vivo environment, which includes time-dependent dynamics of cytokine levels, extracellular matrix attachments, and intercellular contacts10, 15-18. To probe the contribution of these factors in host-pathogen interaction, it is critical to find a model organism to visualize these aspects of infection non-invasively in a live intact host. 
The zebrafish larva offers a unique and versatile vertebrate host for the study of infection. For the first 30 days of development zebrafish larvae have only innate immune defenses2, 19-21, simplifying the study of diseases such as disseminated candidiasis that are highly dependent on innate immunity. The small size and transparency of zebrafish larvae enable imaging of infection dynamics at the cellular level for both host and pathogen. Transgenic larvae with fluorescing innate immune cells can be used to identify specific cells types involved in infection22-24. Modified anti-sense oligonucleotides (Morpholinos) can be used to knock down various immune components such as phagocyte NADPH oxidase and study the changes in response to fungal infection5. In addition to the ethical and practical advantages of using a small lower vertebrate, the zebrafish larvae offers the unique possibility to image the pitched battle between pathogen and host both intravitally and in color. 
The zebrafish has been used to model infection for a number of human pathogenic bacteria, and has been instrumental in major advances in our understanding of mycobacterial infection3, 25. However, only recently have much larger pathogens such as fungi been used to infect larva5, 23, 26, and to date there has not been a detailed visual description of the infection methodology. Here we present our techniques for hindbrain ventricle microinjection of prim25 zebrafish, including our modifications to previous protocols. Our findings using the larval zebrafish model for fungal infection diverge from in vitro studies and reinforce the need to examine the host-pathogen interaction in the complex environment of the host rather than the simplified system of the Petri dish5.

The rapid development, small size and transparency of zebrafish are tremendous advantages for the study of innate immune control of infection1-4. Here we demonstrate techniques for infecting zebrafish larvae using the fungal pathogen Candida albicans by microinjection, methodology recently used to implicate phagocyte NADPH oxidase activity in control of fungal dimorphism5.

Zebrafish 애벌레의 분해해 칸디다 증의 비침습 이미징

Disseminated candidiasis caused by the pathogen Candida albicans is a clinically important problem in hospitalized individuals and is associated with a 30 ...

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.

기자 효소 형광와 쥐에서 이미징 결핵균

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.

식 세포에서 세포내 복제에 대 한의 진 균 abscessus 독성 마커의 식별

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

Modeling Tuberculosis in Mycobacterium marinum Infected Adult Zebrafish

Mycobacterium tuberculosis is currently the deadliest human pathogen causing 1.7 million deaths and 10.4 million infections every year. Exposure to this bacterium causes a wide disease spectrum in humans ranging from a sterilized infection to an actively progressing deadly disease. The most common form is the latent tuberculosis, which is asymptomatic, but has the potential to reactivate into a fulminant disease. Adult zebrafish and its natural pathogen Mycobacterium marinum have recently proven to be an applicable model to study the wide disease spectrum of tuberculosis. Importantly, spontaneous latency and reactivation as well as adaptive immune responses in the context of mycobacterial infection can be studied in this model. In this article, we describe methods for the experimental infection of adult zebrafish, the collection of internal organs for the extraction of nucleic acids for the measurement of mycobacterial loads and host immune responses by quantitative PCR. The in-house-developed, M. marinum-specific qPCR assay is more sensitive than the traditional plating methods as it also detects DNA from non-dividing, dormant or recently dead mycobacteria. As both DNA and RNA are extracted from the same individual, it is possible to study the relationships between the diseased state, and the host and pathogen gene-expression. The adult zebrafish model for tuberculosis thus presents itself as a highly applicable, non-mammalian in vivo system to study host-pathogen interactions.

Modeling Tuberculosis in Mycobacterium marinum Infected Adult Zebrafish

Here, we present a protocol to model human tuberculosis in an adult zebrafish using its natural pathogen Mycobacterium marinum. Extracted DNA and RNA from the internal organs of infected zebrafish can be used to reveal the total mycobacterial loads in the fish and the host&#39;s immune responses with qPCR.

진 균 marinum 감염 성인 Zebrafish에 모델링 결핵

Mycobacterium tuberculosis is currently the deadliest human pathogen causing 1.7 million deaths and 10.4 million infections every year. Exposure to this ...

Evaluating Virulence and Pathogenesis of Aeromonas Infection in a Caenorhabditis elegans Model

The human pathogen Aeromonas has been clinically shown to cause gastroenteritis, wound infections, septicemia, and urinary tract infections. Most human diseases have been reported to be associated with four species of bacteria: Aeromonas dhakensis, Aeromonas hydrophila, Aeromonas veronii, and Aeromonas caviae. The model organism Caenorhabditis elegans is a bacterivore that provides an excellent infection model by which to study the bacterial pathogenesis of Aeromonas. Here, we introduce three different experiments to study Aeromonas infection using a C. elegans model, including survival, liquid toxicity, and muscle necrosis assays. The results of the three methods determining the virulence of Aeromonas were consistent. A. dhakensis was shown to be the most toxic among the 4 major Aeromonas species causing clinical infections. These methods are shown to be a convenient way to evaluate the toxicity among and within Aeromonas species and contribute to our understanding of the pathogenesis of Aeromonas infection.

Evaluating Virulence and Pathogenesis of Aeromonas Infection in a Caenorhabditis elegans Model

Here, we introduce three different experiments to study Aeromonas infection in C. elegans. Using these convenient methods, it is easy to evaluate the toxicity among and within Aeromonas species.

꼬마 선 충 모델에서 Aeromonas 감염의 병 인 및 독성 평가

The human pathogen Aeromonas has been clinically shown to cause gastroenteritis, wound infections, septicemia, and urinary tract infections. Most human ...

Flow Cytometric Measurement Of ROS Production In Macrophages In Response To Fc&#947;R Cross-linking

The oxidative or respiratory burst is used to describe the rapid consumption of oxygen and generation of reactive oxygen species (ROS) by phagocytes in response to various immune stimuli. ROS generated during immune activation exerts potent antimicrobial activity primarily through the ability of ROS to damage DNA and proteins, causing death of microorganisms. Being able to measure ROS production reproducibly and with ease is necessary in order to assess the contribution of various pathways and molecules to this mechanism of host defense. In this paper, we demonstrate the use of fluorescent probes and flow cytometry to detect ROS production. Although widely used, fluorescent measurement of ROS is notoriously problematic, especially with regards to measurement of ROS induced by specific and not mitogenic stimuli. We present a detailed methodology to detect ROS generated as a result of specific Fc&#947;R stimulation beginning with macrophage generation, priming, staining, Fc&#947;R cross-linking, and ending with flow cytometric analysis.

This study demonstrates the use of flow cytometry to detect reactive oxygen species (ROS) production resulting from activation of the Fc&#947;R. This method can be used to assess changes in the antimicrobial and redox signaling function of phagocytes in response to immune complexes, opsonized microorganisms, or direct Fc&#947;R cross-linking.

선생님 FcγR Cross-linking에 대 식 세포에서 생산의 흐름 Cytometric 측정

The oxidative or respiratory burst is used to describe the rapid consumption of oxygen and generation of reactive oxygen species (ROS) by phagocytes in ...

Adoptive Immunotherapy of iNKT Cells in Glucose-6-Phosphate Isomerase (G6PI)-Induced RA Mice

Rheumatoid arthritis (RA) is a complex chronic inflammatory autoimmune disease. The pathogenesis of the disease is related to invariant natural killer T (iNKT) cells. Patients with active RA present fewer iNKT cells, defective cell function, and excessive polarization of Th1. In this study, an RA animal model was established using a mixture of hGPI325-339 and hGPI469-483 peptides. The iNKT cells were obtained by in vivo induction and in vitro purification, followed by infusion into RA mice for adoptive immunotherapy. The in vivo imaging system (IVIS) tracking revealed that iNKT cells were mainly distributed in the spleen and liver. On day 12 after cell therapy, the disease progression slowed down significantly, the clinical symptoms were alleviated, the abundance of iNKT cells in the thymus increased, the proportion of iNKT1 in the thymus decreased, and the levels of TNF-&#945;, IFN-&#947;, and IL-6 in the serum decreased. Adoptive immunotherapy of iNKT cells restored the balance of immune cells and corrected the excessive inflammation of the body.

Adoptive Immunotherapy of iNKT Cells in Glucose-6-Phosphate Isomerase G6PI-Induced RA Mice

This protocol uses G6PI mixed peptides to construct rheumatoid arthritis models that are closer to that of human rheumatoid arthritis in CD4+ T cells and cytokines. High purity invariant natural killer T cells (mainly iNKT2) with specific phenotypes and functions were obtained by in vivo induction and in vitro purification for adoptive immunotherapy.

포도당-6-인산염 이사머라제(G6PI)-유도 RA 마우스에서 iNKT 세포의 입양 면역 요법

Rheumatoid arthritis (RA) is a complex chronic inflammatory autoimmune disease. The pathogenesis of the disease is related to invariant natural killer T ...

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