COLCIENCIAS ve Tropikal Hastalıklar karşı Ürünleri Geliştirme Merkezi - - CIDEPRO Bu çalışma Antioquia Üniversitesi (Codi), Fen ve Teknoloji Geliştirme Kolombiyalı Enstitüsü Araştırma Komitesi hibe ile desteklenmiştir.

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	<li>WHO. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Control+of+the+leishmaniasis.">Control of the leishmaniasis.</a> Report of a Meeting of the WHO Expert Committee on the Control of Leishmaniasis WHO. 949, (2010).</li><li>Titus, R. G., Marchand, M., Boon, T., Louis, J. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+limiting+dilution+assay+for+quantifying+Leishmania+major+in+tissues+of+infected+mice.">A limiting dilution assay for quantifying Leishmania major in tissues of infected mice.</a> Parasite Immunol. 7, 545-555 (1985).</li><li>Reynolds, K. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+Kodak+Ektachem+dry+layer+technology+for+clinical+chemistry.">The Kodak Ektachem dry layer technology for clinical chemistry.</a> Upsala. J. Med. Sci. 91, 143-146 (1986).</li><li>Handman, E., Ceredig, R., Mitchell, G. F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Murine+cutaneous+leishmaniasis:+disease+patterns+in+intact+and+nude+mice+of+various+genotypes+and+examination+of+some+differences+between+normal+and+infected+macrophages.">Murine cutaneous leishmaniasis: disease patterns in intact and nude mice of various genotypes and examination of some differences between normal and infected macrophages.</a> Australian J. Exp. Biol. Med. Sci. 57, 9-29 (1979).</li><li>Hanson, W., Chapman, W., Waits, V., Lovelace, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Development+of+Leishmania+(Viannia)+panamensis+lesions+and+relationship+of+numbers+of+amastigotes+to+lesion+area+antimony-treated+and+untreated+hamsters.">Development of Leishmania (Viannia) panamensis lesions and relationship of numbers of amastigotes to lesion area antimony-treated and untreated hamsters.</a> J. Parasitol. 77, 780-783 (1991).</li><li>Henao, H. H., Osorio, Y., Saravia, N. G., G&#243;mez, A., Travi, B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Efficacy+and+toxicity+of+pentavalentantimonials+(Glucantime+and+Pentostam)+in+an+American+cutaneous+leishmaniasis+animal+model:+luminometry+application.">Efficacy and toxicity of pentavalentantimonials (Glucantime and Pentostam) in an American cutaneous leishmaniasis animal model: luminometry application.</a> Biom&#233;dica. 24, 393-402 (2004).</li><li>Travi, B. L., Martinez, J. E., Zea, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Antimonial+treatment+of+hamsters+infected+with+Leishmania+(Viannia)+panamensis:+assessment+of+parasitological+cure+with+different+therapeutic+schedules.">Antimonial treatment of hamsters infected with Leishmania (Viannia) panamensis: assessment of parasitological cure with different therapeutic schedules.</a> Trans. R. Soc. Trop. Med. Hyg. 87, 567-569 (1993).</li><li>Hommel, M., jaffe, C. L., Travi, B., Milon, G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Experimental+models+for+leishmaniasis+and+for+testing+anti-leishmanial+vaccines.">Experimental models for leishmaniasis and for testing anti-leishmanial vaccines.</a> Ann. Trop. Med. Parasitol. 89, 55-73 (1995).</li><li>Travi, B. L., Osorio, Y., Saravia, N. G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+inflammatory+response+promotes+cutaneous+metastasis+in+hamsters+infected+with+Leishmania+(Viannia)+panamensis.">The inflammatory response promotes cutaneous metastasis in hamsters infected with Leishmania (Viannia) panamensis.</a> J. Parasitol. 82, 454-457 (1996).</li><li>Travi, B. L., Osorio, Y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Failure+of+Albendazole+as+an+alternative+treatment+of+cutaneous+Leishmaniasis+in+the+hamster+model.">Failure of Albendazole as an alternative treatment of cutaneous Leishmaniasis in the hamster model.</a> Memorias Instituto Oswaldo. 93, 515 (1998).</li><li>Travi, B. L., Osorio, Y., Melby, P. C., Chandrasekar, B., Arteaga, L., Saravia, N. G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Gender+is+a+major+determinant+of+the+clinical+evolution+and+immune+response+in+hamsters+infected+with+Leishmania+spp.">Gender is a major determinant of the clinical evolution and immune response in hamsters infected with Leishmania spp.</a> Infect Immun. 70, 2288-2296 (2002).</li><li>Osorio, Y., Melby, P. C., Pirmez, C., Chandrasekar, B., Guar&#237;n, N., Travi, B. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+site+of+cutaneous+infection+influences+the+immunological+response+and+clinical+outcome+of+hamsters+infected+with+Leishmania+panamensis.">The site of cutaneous infection influences the immunological response and clinical outcome of hamsters infected with Leishmania panamensis.</a> Parasite Immunol. 25, 139-148 (2003).</li><li>Osorio, Y., Bonilla, D. L., Peniche, A. G., Melby, P. C., Travi, B. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Pregnancy+enhances+the+innate+immune+response+in+experimental+cutaneous+leishmaniasis+through+hormone-modulated+nitric+oxide+production.">Pregnancy enhances the innate immune response in experimental cutaneous leishmaniasis through hormone-modulated nitric oxide production.</a> J. Leukoc. Biol. 83, 1413-1422 (2008).</li><li>Espitia, C. M., Zhao, W., Saldarriaga, O., Osorio, Y., Harrison, L. M., Cappello, M., Travi, B. L., Melby, P. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Duplex+real-time+reverse+transcriptase+PCR+to+determine+cytokine+mRNA+expression+in+a+hamster+model+of+New+World+cutaneous+leishmaniasis.">Duplex real-time reverse transcriptase PCR to determine cytokine mRNA expression in a hamster model of New World cutaneous leishmaniasis.</a> BMC Immunol. 22, 11-31 (2010).</li></ol>

Çıkar çatışması ilan etti.

Kutanöz leishmaniasis tropik ve neotropics endemiktir. Genellikle küçük olduğundan kütanöz nodüllerden gros mukozal doku tahribine arasındadır klinik belirtileri, bir değişken spektrumunun bir grup hastalığı olarak adlandırılır. En mevcut ilaçlar pahalı, uzun tedavi rejimleri gerektiren ve yeni ilaçların keşfi gerektiren, giderek etkisiz hale gelmektedir. Fare modelinde yaygın olarak kullanılan ama bazı dezavantajlara sahiptir. Oldukça BALB / c görüldüğü gibi ...

<table border="1"><tbody><tr><td> Reaktif Adı </td><td> Tip </td><td> Şirket </td><td> Katalog numarası </td></tr><tr><td> Ketamin </td><td> Reaktif </td><td> Holliday-Scott SA </td><td></td></tr><tr><td> Xilacine </td><td> Reaktif </td><td> Sentez </td><td></td></tr><tr><td> PBS </td><td> Reaktif </td><td> GIBCO </td><td> 14190-136 </td></tr><tr><td> Dijital kumpas </td><td> Ekipman </td><td> Balıkçı </td><td> 15-077-958 </td></tr><tr><td> Giemsa </td><td> Reaktif </td><td> SIGMA </td><td> GS1L-1L </td></tr><tr><td> Formalin </td><td> Reaktif </td><td> Nova laboratuvarı </td><td> 11273 </td></tr><tr><td> Parafin </td><td> Reaktif </td><td> PECHINEY Plastik Ambalaj </td><td> PM-996 </td></tr><tr><td> Haemotoxilin </td><td> Reaktif </td><td> Nova laboratuvarı </td><td&gt; 10870103 </td></tr><tr><td> Eosin </td><td></td><td> Nova laboratuvarı </td><td> 10870203 </td></tr><tr><td> Kodak Ektachem kuru kimya </td><td> Ekipman </td><td> Kodak Ektachem </td><td> DT-60 </td></tr><tr><td> meglumin antimoniate </td><td> Reaktif </td><td> Aventis </td><td></td></tr><tr><td> Mikroskopi </td><td> Ekipman </td><td> Nikon </td><td> YS2-T </td></tr></tbody></table>

cutaneous leishmaniasis in the dorsal skin of hamsters: a useful model for the screening of antileishmanial drugs

Geleneksel olarak, hamster deneysel burun veya haydut olarak aşılanır. Ancak bu sitelerde bir ülser her zaman gerçekleşir değil, lezyon büyüklüğü ölçümü zor bir işlemdir ve hayvanlar nedeniyle lezyonun, yemek nefes ve hareket zorluğu gösterir. Kutanöz leishmaniasis, genç erişkin erkek ve kadın için altın hamster hamster modeli optimize etmek için (Mesocricetus auratus) 1 ile 1,5 x l0 7 Leishmania türlerinin promastigotları ve daha sonraki lezyonların ilerlemesi ile sırt derisine intradermal enjekte edildi kadar değerlendirildi 16 hafta sonrası enfeksiyon. Farklı türleri tarafından enfeksiyona duyarlı olarak Leishmania karşı ilaçları değerlendirmek için biyo-modeli yeterli kabul edilir çünkü altın hamsteri seçildi. Kronik fakat kontrollü lezyonlar ve insanlarda görülen benzer bulguları ile klinik bir evrim hamster sonuçlarının deri enfeksiyonu. Bu nedenle, o kurulmasısertleştirmek ve ülserlerin alanına göre lezyonun boyutu ölçerek enfeksiyon f ölçüde mümkündür. Bu yaklaşım, aşılama sırasında, çok yönlülüğü ve kolay yönetim kanıtlamış, farklı tedavilerden sonra klinik örneklerin farklı yolları ve alınması yoluyla Tipik lezyonlar (ülserler), tedavilerin uygulama takip ve karakterizasyonu. Bu yöntem hareket ile ilgili hayvan yaşam kalitesi, gıda ve su, oyun ve isalso korunmuş sosyal faaliyetler için arama kullanarak.

Watch this Scientific Journal Video about Cutaneous Leishmaniasis in the Dorsal Skin of Hamsters: a Useful Model for the Screening of Antileishmanial Drugs at JoVE.com

Cutaneous Leishmaniasis in the Dorsal Skin of Hamsters: a Useful Model for the Screening of Antileishmanial Drugs

Intradermal enjeksiyonu ile kutanöz leishmaniasis için deneysel Hamster model Optimizasyonu<em&gt; Leishmania</em&gt; Dorsal deriyi promastigotları. Bu yaklaşım, aşılama sırasında, takip, lezyon karakterizasyonu, tedavilerin uygulama ve klinik örneklerin alınması yararlıdır. Yiyecek ve su için harekettir, arama, oyun ve sosyal aktiviteler korunur.

Hamsterlar ve Dorsal Skin Kutanöz Leishmaniasis: Antileishmanial Uyuşturucu Tarama için Faydalı Model

Traditionally, hamsters are experimentally inoculated in the snout or the footpad. However in these sites an ulcer not always occurs, measurement of ...

cutaneous-leishmaniasis-dorsal-skin-hamsters-useful-model-for

Research

JoVE Journal

Immunology and Infection

21.9K Görüntüleme.  University of Antioquia. Intradermal enjeksiyonu ile kutanöz leishmaniasis için deneysel Hamster model Optimizasyonu Leishmania Dorsal deriyi promastigotları. Bu yaklaşım, aşılama sırasında, takip, lezyon karakterizasyonu, tedavilerin uygulama ve klinik örneklerin alınması yararlıdır. Yiyecek ve su için harekettir, arama, oyun ve sosyal aktiviteler korunur.

Video: Cutaneous Leishmaniasis in the Dorsal Skin of Hamsters: a Useful Model for the Screening of Antileishmanial Drugs

Induction of Graft-versus-host Disease and In Vivo T Cell Monitoring Using an MHC-matched Murine Model

Graft-versus-host disease (GVHD) is the limiting barrier to the broad use of bone marrow transplant as a curative therapy for a variety of hematological deficiencies. GVHD is caused by mature alloreactive T cells present in the bone marrow graft that are infused into the recipient and cause damage to host organs. However, in mice, T cells must be added to the bone marrow inoculum to cause GVHD. Although extensive work has been done to characterize T cell responses post transplant, bioluminescent imaging technology is a non-invasive method to monitor T cell trafficking patterns in vivo. 
Following lethal irradiation, recipient mice are transplanted with bone marrow cells and splenocytes from donor mice. T cell subsets from L2G85.B6 (transgenic mice that constitutively express luciferase) are included in the transplant. By only transplanting certain T cell subsets, one is able to track specific T cell subsets in vivo, and based on their location, develop hypotheses regarding the role of specific T cell subsets in promoting GVHD at various time points. At predetermined intervals post transplant, recipient mice are imaged using a Xenogen IVIS CCD camera. Light intensity can be quantified using Living Image software to generate a pseudo-color image based on photon intensity (red = high intensity, violet = low intensity). 
Between 4-7 days post transplant, recipient mice begin to show clinical signs of GVHD. Cooke et al.1 developed a scoring system to quantitate disease progression based on the recipient mice fur texture, skin integrity, activity, weight loss, and posture. Mice are scored daily, and euthanized when they become moribund. Recipient mice generally become moribund 20-30 days post transplant. 
Murine models are valuable tools for studying the immunology of GVHD. Selectively transplanting particular T cell subsets allows for careful identification of the roles each subset plays. Non-invasively tracking T cell responses in vivo adds another layer of value to murine GVHD models.

Induction of Graft-versus-host Disease and In Vivo T Cell Monitoring Using an MHC-matched Murine Model

Murine bone marrow transplantation is a widely used technique to study immunological mechanisms governing graft-versus-host disease in humans. The ability to monitor T cell trafficking patterns in vivo allows for detailed analysis of the development and perpetuation of T cell responses during graft-versus-host disease.

Graft-versus-host hastalığı indüksiyonu ve<em&gt; In Vivo</emBir MHC-eşlemeli murin Model Kullanma&gt; T Hücre İzleme

Graft-versus-host disease (GVHD) is the limiting barrier to the broad use of bone marrow transplant as a curative therapy for a variety of hematological ...

İmmünoloji ve Enfeksiyon

A Parasite Rescue and Transformation Assay for Antileishmanial Screening Against Intracellular Leishmania donovani Amastigotes in THP1 Human Acute Monocytic Leukemia Cell Line

Leishmaniasis is one of the world's most neglected diseases, largely affecting the poorest of the poor, mainly in developing countries. Over 350 million people are considered at risk of contracting leishmaniasis, and approximately 2 million new cases occur yearly1. Leishmania donovani is the causative agent for visceral leishmaniasis (VL), the most fatal form of the disease. The choice of drugs available to treat leishmaniasis is limited 2;current treatments provide limited efficacy and many are toxic at therapeutic doses. In addition, most of the first line treatment drugs have already lost their utility due to increasing multiple drug resistance 3. The current pipeline of anti-leishmanial drugs is also severely depleted. Sustained efforts are needed to enrich a new anti-leishmanial drug discovery pipeline, and this endeavor relies on the availability of suitable in vitro screening models.
In vitro promastigotes 4 and axenic amastigotes assays5 are primarily used for anti-leishmanial drug screening however, may not be appropriate due to significant cellular, physiological, biochemical and molecular differences in comparison to intracellular amastigotes. Assays with macrophage-amastigotes models are considered closest to the pathophysiological conditions of leishmaniasis, and are therefore the most appropriate for in vitro screening. Differentiated, non-dividing human acute monocytic leukemia cells (THP1) (make an attractive) alternative to isolated primary macrophages and can be used for assaying anti-leishmanial activity of different compounds against intracellular amastigotes.
Here, we present a parasite-rescue and transformation assay with differentiated THP1 cells infected in vitro with Leishmania donovani for screening pure compounds and natural products extracts and determining the efficacy against the intracellular Leishmania amastigotes. The assay involves the following steps: (1) differentiation of THP1 cells to non-dividing macrophages, (2) infection of macrophages with L. donovani metacyclic promastigotes, (3) treatment of infected cells with test drugs, (4) controlled lysis of infected macrophages, (5) release/rescue of amastigotes and (6) transformation of live amastigotes to promastigotes. The assay was optimized using detergent treatment for controlled lysis of Leishmania-infected THP1 cells to achieve almost complete rescue of viable intracellular amastigotes with minimal effect on their ability to transform to promastigotes. Different macrophage:promastigotes ratios were tested to achieve maximum infection. Quantification of the infection was performed through transformation of live, rescued Leishmania amastigotes to promastigotes and evaluation of their growth by an alamarBlue fluorometric assay in 96-well microplates. This assay is comparable to the currently-used microscopic, transgenic reporter gene and digital-image analysis assays. This assay is robust and measures only the live intracellular amastigotes compared to reporter gene and image analysis assays, which may not differentiate between live and dead amastigotes. Also, the assay has been validated with a current panel of anti-leishmanial drugs and has been successfully applied to large-scale screening of pure compounds and a library of natural products fractions (Tekwani et al. unpublished).

A Parasite Rescue and Transformation Assay for Antileishmanial Screening Against Intracellular Leishmania donovani Amastigotes in THP1 Human Acute Monocytic Leukemia Cell Line

A parasite-rescue and transformation assay with THP1 cells infected in vitro with Leishmania donovani has been optimized for anti-leishmanial drug screening. The assay involves differentiation of THP1 cells, infection with promastigotes, treatment with test drugs, controlled lysis of the infected macrophages, rescue of amastigotes, transformation to promastigotes and monitoring promastigote growth and proliferation with a fluorometric assay.

Hücre içi Karşı Antileishmanial Tarama için Parasite Kurtarma ve Dönüşüm Testi<em&gt; Leishmania donovani</emTHP1 İnsan Akut Monositik Lösemi Hücre Hattı&gt; Amastigotes

Leishmaniasis is  one of the world's most neglected diseases, largely affecting the  poorest of the poor, mainly in developing countries. Over 350 million ...

A New Screening Method for the Directed Evolution of Thermostable Bacteriolytic Enzymes

Directed evolution is defined as a method to harness natural selection in order to engineer proteins to acquire particular properties that are not associated with the protein in nature. Literature has provided numerous examples regarding the implementation of directed evolution to successfully alter molecular specificity and catalysis1. The primary advantage of utilizing directed evolution instead of more rational-based approaches for molecular engineering relates to the volume and diversity of variants that can be screened2. One possible application of directed evolution involves improving structural stability of bacteriolytic enzymes, such as endolysins. Bacteriophage encode and express endolysins to hydrolyze a critical covalent bond in the peptidoglycan (i.e. cell wall) of bacteria, resulting in host cell lysis and liberation of progeny virions. Notably, these enzymes possess the ability to extrinsically induce lysis to susceptible bacteria in the absence of phage and furthermore have been validated both in vitro and in vivo for their therapeutic potential3-5. The subject of our directed evolution study involves the PlyC endolysin, which is composed of PlyCA and PlyCB subunits6. When purified and added extrinsically, the PlyC holoenzyme lyses group A streptococci (GAS) as well as other streptococcal groups in a matter of seconds and furthermore has been validated in vivo against GAS7. Significantly, monitoring residual enzyme kinetics after elevated temperature incubation provides distinct evidence that PlyC loses lytic activity abruptly at 45 &deg;C, suggesting a short therapeutic shelf life, which may limit additional development of this enzyme. Further studies reveal the lack of thermal stability is only observed for the PlyCA subunit, whereas the PlyCB subunit is stable up to ~90 &deg;C (unpublished observation). In addition to PlyC, there are several examples in literature that describe the thermolabile nature of endolysins. For example, the Staphylococcus aureus endolysin LysK and Streptococcus pneumoniae endolysins Cpl-1 and Pal lose activity spontaneously at 42 &deg;C, 43.5 &deg;C and 50.2 &deg;C, respectively8-10. According to the Arrhenius equation, which relates the rate of a chemical reaction to the temperature present in the particular system, an increase in thermostability will correlate with an increase in shelf life expectancy11. Toward this end, directed evolution has been shown to be a useful tool for altering the thermal activity of various molecules in nature, but never has this particular technology been exploited successfully for the study of bacteriolytic enzymes. Likewise, successful accounts of progressing the structural stability of this particular class of antimicrobials altogether are nonexistent. In this video, we employ a novel methodology that uses an error-prone DNA polymerase followed by an optimized screening process using a 96 well microtiter plate format to identify mutations to the PlyCA subunit of the PlyC streptococcal endolysin that correlate to an increase in enzyme kinetic stability (Figure 1). Results after just one round of random mutagenesis suggest the methodology is generating PlyC variants that retain more than twice the residual activity when compared to wild-type (WT) PlyC after elevated temperature treatment.

A novel directed evolution method specific to the field of thermostability engineering was developed and consequently validated for bacteriolytic enzymes. After only one round of random mutagenesis, an evolved bacteriolytic enzyme, PlyC 29C3, displayed greater than twice the residual activity when compared to the wild-type protein after elevated temperature incubation.

Termostabil Bacteriolytic Enzimlerin yönlendirilmiş evrimi için Yeni Tarama Yöntemi

Directed evolution is defined as a method to harness natural selection in order to engineer proteins to acquire particular properties that are not ...

VIGS-Mediated Forward Genetics Screening for Identification of Genes Involved in Nonhost Resistance

Nonhost disease resistance of plants against bacterial pathogens is controlled by complex defense pathways. Understanding this mechanism is important for developing durable disease-resistant plants against wide range of pathogens. Virus-induced gene silencing (VIGS)-based forward genetics screening is a useful approach for identification of plant defense genes imparting nonhost resistance. Tobacco rattle virus (TRV)-based VIGS vector is the most efficient VIGS vector to date and has been efficiently used to silence endogenous target genes in Nicotiana benthamiana.

	In this manuscript, we demonstrate a forward genetics screening approach for silencing of individual clones from a cDNA library in N. benthamiana and assessing the response of gene silenced plants for compromised nonhost resistance against nonhost pathogens, Pseudomonas syringae pv. tomato T1, P. syringae pv. glycinea, and X. campestris pv. vesicatoria. These bacterial pathogens are engineered to express GFPuv protein and their green fluorescing colonies can be seen by naked eye under UV light in the nonhost pathogen inoculated plants if the silenced target gene is involved in imparting nonhost resistance. This facilitates reliable and faster identification of gene silenced plants susceptible to nonhost pathogens. Further, promising candidate gene information can be known by sequencing the plant gene insert in TRV vector. Here we demonstrate the high throughput capability of VIGS-mediated forward genetics to identify genes involved in nonhost resistance. Approximately, 100 cDNAs can be individually silenced in about two to three weeks and their relevance in nonhost resistance against several nonhost bacterial pathogens can be studied in a week thereafter. In this manuscript, we enumerate the detailed steps involved in this screening. VIGS-mediated forward genetics screening approach can be extended not only to identifying genes involved in nonhost resistance but also to studying genes imparting several biotic and abiotic stress tolerances in various plant species.

Virus-induced gene silencing is an useful tool for identifying genes involved in nonhost resistance of plants. We demonstrate the use of bacterial pathogens expressing GFPuv in identifying gene silenced plants susceptible to nonhost pathogens. This approach is easy, fast and facilitates large scale screening and similar protocol can be applied to studying various other plant-microbe interactions.

Genler belirlenmesi için VIGS-aracılığı ile İleri Genetik Tarama konakçı olmayan Direnç ilgilendim


	Nonhost disease resistance of plants against bacterial pathogens is controlled by complex defense pathways. Understanding this mechanism is important ...

Loop-mediated Isothermal Amplification (LAMP) Assays for the Species-specific Detection of Eimeria that Infect Chickens

Eimeria species parasites, protozoa which cause the enteric disease coccidiosis, pose a serious threat to the production and welfare of chickens. In the absence of effective control clinical coccidiosis can be devastating. Resistance to the chemoprophylactics frequently used to control Eimeria is common and sub-clinical infection is widespread, influencing feed conversion ratios and susceptibility to other pathogens such as Clostridium perfringens. Despite the availability of polymerase chain reaction (PCR)-based tools, diagnosis of Eimeria infection still relies almost entirely on traditional approaches such as lesion scoring and oocyst morphology, but neither is straightforward. Limitations of the existing molecular tools include the requirement for specialist equipment and difficulties accessing DNA as template. In response a simple field DNA preparation protocol and a panel of species-specific loop-mediated isothermal amplification (LAMP) assays have been developed for the seven Eimeria recognised to infect the chicken. We now provide a detailed protocol describing the preparation of genomic DNA from intestinal tissue collected post-mortem, followed by setup and readout of the LAMP assays. Eimeria species-specific LAMP can be used to monitor parasite occurrence, assessing the efficacy of a farm&#8217;s anticoccidial strategy, and to diagnose sub-clinical infection or clinical disease with particular value when expert surveillance is unavailable.

Loop-mediated Isothermal Amplification LAMP Assays for the Species-specific Detection of Eimeria that Infect Chickens

Diagnosis of Eimeria infection in chickens remains demanding. Parasite morphology- and host pathology-led approaches are commonly inconclusive, while molecular approaches based on PCR have proven demanding in cost and expertise. The aim of this protocol is to establish loop-mediated isothermal amplification (LAMP) as a straightforward molecular diagnostic for eimerian infection.

Türler özgü Algılama Loop-aracılı İzotermal Amplifikasyon (LAMP) Tahliller<em&gt; Eimeria</em&gt; Tavuklar bulaştırmak ki

Eimeria species parasites, protozoa which cause the enteric disease coccidiosis, pose a serious threat to the production and welfare of chickens. In the ...

Visualizing the Effects of Sputum on Biofilm Development Using a Chambered Coverglass Model

Biofilms consist of groups of bacteria encased in a self-secreted matrix. They play an important role in industrial contamination as well as in the development and persistence of many health related infections. One of the most well described and studied biofilms in human disease occurs in chronic pulmonary infection of cystic fibrosis patients. When studying biofilms in the context of the host, many factors can impact biofilm formation and development. In order to identify how host factors may affect biofilm formation and development, we used a static chambered coverglass method to grow biofilms in the presence of host-derived factors in the form of sputum supernatants. Bacteria are seeded into chambers and exposed to sputum filtrates. Following 48 hr of growth, biofilms are stained with a commercial biofilm viability kit prior to confocal microscopy and analysis. Following image acquisition, biofilm properties can be assessed using different software platforms. This method allows us to visualize key properties of biofilm growth in presence of different substances including antibiotics.

This protocol describes the visualization of biofilm development following exposure to host-factors using a slide chamber model. This model allows for direct visualization of biofilm development as well as analysis of biofilm parameters using computer software programs.

Bir odacıklı coverglass Modeli Kullanılarak Biyofilm Kalkınma Sputum Etkilerinin görselleştirme

Biofilms consist of groups of bacteria encased in a self-secreted matrix. They play an important role in industrial contamination as well as in the ...

Vasodilation of Isolated Vessels and the Isolation of the Extracellular Matrix of Tight-skin Mice

The interferon regulatory factor 5 (IRF5) is crucial for cells to determine if they respond in a pro-inflammatory or anti-inflammatory fashion. IRF5's ability to switch cells from one pathway to another is highly attractive as a therapeutic target. We designed a decoy peptide IRF5D with a molecular modeling software for designing small molecules and peptides.
IRF5D inhibited IRF5, reduced alterations in extracellular matrix, and improved endothelial vasodilation in the tight-skin mouse (Tsk/+). The Kd of IRF5D for recombinant IRF5 is 3.72 &plusmn; 0.74 x 10-6 M as determined by binding experiments using biolayer interferometry experiments. Endothelial cells (EC) proliferation and apoptosis were unchanged using increasing concentrations of IRF5D (0 to 100 &#181;g/mL, 24 h). Tsk/+ mice were treated with IRF5D (1 mg/kg/d subcutaneously, 21 d). IRF5 and ICAM expressions were decreased after IRF5D treatment. Endothelial function was improved as assessed by vasodilation of facialis arteries from Tsk/+ mice treated with IRF5D compared to Tsk/+ mice without IRF5D treatment. As a transcription factor, IRF5 traffics from the cytosol to the nucleus. Translocation was assessed by immunohistochemistry on cardiac myocytes cultured on the different cardiac extracellular matrices. IRF5D treatment of the Tsk/+ mouse resulted in a reduced number of IRF5 positive nuclei in comparison to the animals without IRF5D treatment (50 &#181;g/mL, 24 h). These findings demonstrate the important role that IRF5 plays in inflammation and fibrosis in Tsk/+ mice.

We describe the isolation of cardiac extracellular matrix from C57Bl/6J control mice, tight-skin mice, and tight-skin mice treated with the IRF5 inhibitory peptide. We also describe the vasodilation studies on the isolated vessels from C57Bl/6J, tight-skin mice and tight-skin mice treated with the IRF5 inhibitory peptide.

İzole Kapların vazodilatasyon ve Sıkı cilt Fare Ekstraselüler Matrix İzolasyonu

The interferon regulatory factor 5 (IRF5) is crucial for cells to determine if they respond in a pro-inflammatory or anti-inflammatory fashion. IRF5's ...

Arbovirus Infections As Screening Tools for the Identification of Viral Immunomodulators and Host Antiviral Factors

RNA interference- and genome editing-based screening platforms have been widely used to identify host cell factors that restrict virus replication. However, these screens are typically conducted in cells that are naturally permissive to the viral pathogen under study. Therefore, the robust replication of viruses in control conditions may limit the dynamic range of these screens. Furthermore, these screens may be unable to easily identify cellular defense pathways that restrict virus replication if the virus is well-adapted to the host and capable of countering antiviral defenses. In this article, we describe a new paradigm for exploring virus-host interactions through the use of screens that center on naturally abortive infections by arboviruses such as vesicular stomatitis virus (VSV). Despite the ability of VSV to replicate in a wide range of dipteran insect and mammalian hosts, VSV undergoes a post-entry, abortive infection in a variety of cell lines derived from lepidopteran insects, such as the gypsy moth (Lymantria dispar). However, these abortive VSV infections can be &#34;rescued&#34; when host cell antiviral defenses are compromised. We describe how VSV strains encoding convenient reporter genes and restrictive L. dispar cell lines can be paired to set-up screens to identify host factors involved in arbovirus restriction. Furthermore, we also show the utility of these screening tools in the identification of virally encoded factors that rescue VSV replication during coinfection or through ectopic expression, including those encoded by mammalian viruses. The natural restriction of VSV replication in L. dispar cells provides a high signal-to-noise ratio when screening for the conditions that promote VSV rescue, thus enabling the use of simplistic luminescence- and fluorescence-based assays to monitor the changes in VSV replication. These methodologies are valuable for understanding the interplay between host antiviral responses and viral immune evasion factors.

Here, we present the protocols to identify 1) virus-encoded immunomodulators that promote arbovirus replication and 2) eukaryotic host factors that restrict arbovirus replication. These fluorescence- and luminescence-based methods allow researchers to rapidly obtain quantitative readouts of arbovirus replication in simplistic assays with low signal-to-noise ratios.

Araçlar Viral Immunomodulators ve ana bilgisayar Antiviral faktörler tanımlanması için eleme olarak Abdovirüs enfeksiyonlar

RNA interference- and genome editing-based screening platforms have been widely used to identify host cell factors that restrict virus replication. ...

Assessment of Acute Wound Healing using the Dorsal Subcutaneous Polyvinyl Alcohol Sponge Implantation and Excisional Tail Skin Wound Models.

Wound healing is a complex process that requires the orderly progression of inflammation, granulation tissue formation, fibrosis, and resolution. Murine models provide valuable mechanistic insight into these processes; however, no single model fully addresses all aspects of the wound healing response. Instead, it is ideal to use multiple models to address the different aspects of wound healing. Here, two different methods that address diverse aspects of the wound healing response are described. In the first model, polyvinyl alcohol sponges are subcutaneously implanted along the mouse dorsum. Following sponge retrieval, cells can be isolated by mechanical disruption, and fluids can be extracted by centrifugation, thus allowing for a detailed characterization of cellular and cytokine responses in the acute wound environment. A limitation of this model is the inability to assess the rate of wound closure. For this, a tail skin excision model is utilized. In this model, a 10 mm x 3 mm rectangular piece of tail skin is excised along the dorsal surface, near the base of the tail. This model can be easily photographed for planimetric analysis to determine healing rates and can be excised for histological analysis. Both described methods can be utilized in genetically altered mouse strains, or in conjunction with models of comorbid conditions, such as diabetes, aging, or secondary infection, in order to elucidate wound healing mechanisms.

Here, two murine wound healing models are described, one designed to assess cellular and cytokine wound healing responses and the other to quantify the rate of wound closure. These methods can be used with complex disease models such as diabetes to determine mechanisms of various aspects of poor wound healing.

Dorsal Subkutan Polivinil Alkol Sünger İmplantasyonu ve Eksizyonal Kuyruk Deri Yara Modelleri kullanılarak Akut Yara İyileşmesinin Değerlendirilmesi.

Wound healing is a complex process that requires the orderly progression of inflammation, granulation tissue formation, fibrosis, and resolution. Murine ...

Antibiotic Efficacy Testing in an Ex vivo Model of Pseudomonas aeruginosa and Staphylococcus aureus Biofilms in the Cystic Fibrosis Lung

The effective prescription of antibiotics for the bacterial biofilms present within the lungs of individuals with cystic fibrosis (CF) is limited by a poor correlation between antibiotic susceptibility testing (AST) results using standard diagnostic methods (e.g., broth microdilution, disk diffusion, or Etest) and clinical outcomes after antibiotic treatment. Attempts to improve AST by the use of off-the-shelf biofilm growth platforms show little improvement in results. The limited ability of in vitro biofilm systems to mimic the physicochemical environment of the CF lung and, therefore bacterial physiology and biofilm architecture, also acts as a brake on the discovery of novel therapies for CF infection. Here, we present a protocol to perform AST of CF pathogens grown as mature, in vivo-like biofilms in an ex vivo CF lung model comprised of pig bronchiolar tissue and synthetic CF sputum (ex vivo&#160;pig lung, EVPL).
Several in vitro&#160;assays exist for biofilm susceptibility testing, using either standard laboratory medium or various formulations of synthetic CF sputum in microtiter plates. Both growth medium and biofilm substrate (polystyrene plate vs. bronchiolar tissue) are likely to affect biofilm antibiotic tolerance. We show enhanced tolerance of clinical Pseudomonas aeruginosa and Staphylococcus aureus isolates in the ex vivo model; the effects of antibiotic treatment of biofilms is not correlated with the minimum inhibitory concentration (MIC) in standard microdilution assays or a sensitive/resistant classification in disk diffusion assays.
The ex vivo platform could be used for bespoke biofilm AST of patient samples and as an enhanced testing platform for potential antibiofilm agents during pharmaceutical research and development. Improving the prescription or acceleration of antibiofilm drug discovery through the use of more in vivo-like testing platforms could drastically improve health outcomes for individuals with CF, as well as reduce the costs of clinical treatment and discovery research.

Antibiotic Efficacy Testing in an Ex vivo Model of Pseudomonas aeruginosa and Staphylococcus aureus Biofilms in the Cystic Fibrosis Lung

This workflow can be used to perform antibiotic susceptibility testing using an established&#160;ex vivo model of bacterial biofilm in the lungs of individuals with cystic fibrosis. Use of this model could enhance the clinical validity of MBEC (minimal biofilm eradication concentration) assays.

Kistik Fibrozis Akciğerinde Pseudomonas aeruginosa ve Staphylococcus aureus Biofilms Ex vivo Modelinde Antibiyotik Etkinliği Testi

The effective prescription of antibiotics for the bacterial biofilms present within the lungs of individuals with cystic fibrosis (CF) is limited by a ...