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Analyse von Vorgängen der Hypertrophie und Apoptose in JDP2 überexprimierenden Mäusen /Meyering, Bettina. January 2008 (has links)
Zugl.: Giessen, Universiẗat, Diss., 2008.
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Determination of Immunomodulatory Bioactivity Biomarkers and Mechanistic Insights in Umbilical Cord Mesenchymal Stromal CellsSiriwardena, Dylan 28 November 2018 (has links)
Detrimental immune and inflammatory responses contribute to the pathogenesis of various conditions, including Crohn’s disease, Lupus, and sepsis.1,2,3 Unfortunately, novel treatments for detrimental immune and inflammatory responses have been met with little success. Mesenchymal stromal cells (MSCs) represent a promising cellular therapy to treat immune and inflammatory disorders due to their ability to suppress the immune system. However, despite their promise, clinical trials that have employed MSC cellular therapies have produced varying and sometimes conflicting results. These discrepancies have been partially attributed to the cellular heterogeneity within MSC populations. To address these discrepancies, I performed transcriptomic and proteomic analysis of MSCs with varying immunomodulatory capacity to identify robust immunomodulatory biomarkers and gain better mechanistic insights into MSC immunomodulatory function. In this study, MSCs with differing immunomodulatory function were identified and the effect of in vitro passaging and proinflammatory induction on immunomodulatory ability was characterized. To characterize MSC immunomodulatory control mechanisms, RNA sequencing and proteomic analyses were performed on MSCs with different immunomodulatory capabilities. These analyses enabled the identification of potential immunomodulatory biomarkers and regulatory mechanisms. Finally, to test the therapeutic efficacy of immunomodulatory MSC subpopulations, I developed a humanize mouse model for sepsis. Overall, this work contributes to our understanding of MSC immunomodulation and to the development of a robust MSC cellular therapeutics.
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Human-specific adaptations in Vpu conferring anti-tetherin activity are critical for efficient early HIV-1 replication in vivo / In vivoでVpuの抗Tetherin活性はHIV-1複製の初期に重要であるYamada, Eri 26 March 2018 (has links)
京都大学 / 0048 / 新制・課程博士 / 博士(医学) / 甲第21022号 / 医博第4368号 / 新制||医||1028(附属図書館) / 京都大学大学院医学研究科医学専攻 / (主査)教授 朝長 啓造, 教授 萩原 正敏, 教授 髙折 晃史 / 学位規則第4条第1項該当 / Doctor of Medical Science / Kyoto University / DFAM
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COMBATING THE HIV/TB CO-INFECTION SYNDEMIC: TESTING A NOVEL RESPIRATORY MUCOSAL ADENOVIRAL TUBERCULOSIS VACCINE IN NAÏVE AND HIV-INFECTED HUMANIZED MICE / TESTING A TB VACCINE IN HUMANIZED MICE IN THE CONTEXT OF HIVChacon, Alexis January 2023 (has links)
HIV and Tuberculosis (TB) co-infection place an immense burden on health care systems as they act in synergy to worsen disease prognoses. TB is the most common cause of death in people living with HIV (PLWH) and in turn, HIV is the most significant risk factor for progressing from latent to active TB disease. While HIV and TB are endemic in sub-Saharan Africa, they also disproportionately affect marginalized populations in Canada. Unfortunately, the only licensed TB vaccine, BCG, does not protect from adult pulmonary TB and is not recommended for PLWH. Thus, the development of novel TB vaccines, which are safe and effective in PLWH, remains an urgent global necessity. We have found that humanized mice (hu-mice) are ideal models to research this as they can be successfully infected with HIV, TB and HIV/TB and recapitulate human disease pathology. A next-generation respiratory mucosal (RM) trivalent chimpanzee adenoviral-vectored vaccine (Tri:ChAd68) was developed and tested in our naïve and HIV-infected hu-mice. When immunizing naïve hu-mice, a trend of increased M.tb-specific CD4+ T cells producing IFNγ and TNFα in the lungs and spleen was observed. After subsequent M.tb infection, the vaccinated naïve hu-mice also exhibited significantly reduced lung mycobacterial burden, tissue dissemination and lung pathology. We then investigated the vaccine immunogenicity and ability to protect from TB in the context of HIV. Our immunized HIV-infected hu-mice were also able to produce M.tb-specific T cells and when challenged with M.tb, we observed a decreased trend in mycobacterial load in the lungs, indicating that the vaccine may be able to offer protection against TB when a prior HIV infection is present. These findings demonstrate the protective potential of the RM Tri:ChAd68 vaccine against TB disease for PLWH. In the future, we will test this vaccine in antiretroviral treated HIV-infected hu-mice to increase clinical significance. / Thesis / Master of Science in Medical Sciences (MSMS) / HIV and TB are major diseases that can occur together, severely worsening patients’ health and challenging global healthcare systems. The current TB vaccine, BCG, isn’t ideal for people living with HIV (PLWH), causing this vulnerable population to be at greater risk of getting TB infection. Therefore, developing a new TB vaccine that is safe and effective in PLWH is an urgent global issue. We used humanized mice that develop human immune cells to test a novel TB vaccine delivered to the lungs (Tri:ChAd68) to see if it could protect against TB and overcome immune challenges from HIV. We saw increased immune responses and lower TB infection in our vaccinated humanized mice and the vaccine appeared to also be beneficial in the mice that had prior HIV infection. This suggests the Tri:ChAd68 vaccine may be able to offer protection against TB in PLWH; however, more studies are needed to conclude this.
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Development of innovative liposome-based constructs for non-invasive cancer immunotherapy in humans / Développement de constructions liposomiques innovantes pour l’immunothérapie humaineSaliba, Hanadi 27 September 2017 (has links)
La voie d’administration d’un vaccin et le modèle préclinique dans le lequel il est évalué sont des facteurs majeurs qui contribuent à son succès chez l’homme. Dans ce contexte, la découverte que la voie transcutanée (TC) induit une réponse immunitaire puissante a fait de la vaccination antitumorale TC une stratégie prometteuse. Une évaluation complémentaire du candidat vaccin dans un modèle de souris humanisée (Hu-SPL-NSG), plus prédictif de la réponse humaine, est aussi nécessaire. L’objectif de cette thèse est i) d'optimiser des constructions liposomiques peptidiques incorporant un agoniste de TLR pour la voie TC et ii) d’évaluer leur immunogénicité dans le modèle Hu-SPL-NSG. Ainsi, nous avons fait varier la nature de l’agoniste de TLR et la déformabilité de la vésicule liposomique, et avons rajouté une molécule de ciblage des cellules dendritiques. L’immunogenicité de ces formulations par voie TC a ensuite été évaluée chez la souris. Enfin, nous avons testé la capacité d’une construction liposomique modèle à induire une réponse cellulaire et humorale dans le modèle Hu-SPL-NSG. L’ensemble de ces travaux a fourni une première preuve de concept sur la faisabilité de la vaccination antitumorale TC par des liposomes et de son applicabilité chez l’homme. / A vaccine administration route and the preclinical model in which it is evaluated are major factors that contribute to its success in humans. In this context, the discovery that the transcutaneous (TC) route induces a powerful immune response has made the TC tumor-specific vaccination a promising strategy. Further evaluation of candidate vaccines in a humanized mouse model (Hu-SPL-NSG), more predictive of the human response, is also needed. The objective of this thesis is to (i) optimize liposomal constructs incorporating peptides and a TLR agonist for the TC pathway and (ii) evaluate their immunogenicity in the Hu-SPL-NSG model. Thus, we have varied the nature of the TLR agonist and the deformability of the liposomal vesicle, and have added a dendritic cell targeting molecule. Immunogenicity of these formulations by the TC route was then evaluated in mice. Finally, we tested the ability of a model liposomal construct to induce a cellular and humoral response in the Hu-SPL-NSG model.All of this work provided a first proof of concept on the feasibility of TC tumor-specific vaccination by liposomes and its applicability in humans.
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Étude du rôle de la membrane basale spécialisée dans la maturation de l'émailViegas Costa, Luiz Claudio 05 1900 (has links)
Les cellules épithéliales qui produisent l’émail, les améloblastes, sont séparées de l'émail au
niveau de la zone de maturation par une membrane basale spécialisée (MBS) enrichie en
laminine 332 (LM-332). Cette protéine hétérotrimérique (composée des chaînes α3, ß3 et γ2)
assure l'intégrité structurelle des membranes basales (MB) et influence divers processus
cellulaires épithéliaux tels que l'adhésion et la différenciation cellulaire.
Des modèles de souris « knockout » (KO), où les gènes codant pour LM-332 ont été supprimés,
meurent peu après la naissance. Néanmoins, ce phénotype létal peut être contourné en
substituant chez la souris le gène produisant la chaîne γ2 de la laminine (LAMC2) par sa forme
humaine, sous le contrôle de l’expression du promoteur-rtTA, de la cytokératine 14, inductible
par la prise de doxycycline (Dox) - (Tet-on).
Le but de ce projet est d’examiner si l’utilisation de cette protéine humaine chez la souris a un
effet sur la structuration de la MBS ainsi que sur la maturation de l'émail.
La phase de maturation de l’organe de l’émail chez la souris transgénique a été sévèrement
altérée par rapport à une souris normale (WT). La MBS n’est plus visible, une matrice
dystrophique s’est formée dans la couche d'émail dans la phase de maturation, et la présence
d’une matrice résiduelle de l'émail est observée durant la phase tardive de maturation. Des
micro-analyses tomographiques ont révélé une usure excessive des surfaces occlusales des
molaires, un écroulement de l'émail sur les pointes des incisives et une hypominéralisation de
l'émail.
Cependant, aucune altération structurale due à cette recombinaison transgénique n’a été
observée dans d'autres sites épithéliaux, tels que la peau, le palais et la langue.
Ces résultats indiquent que, bien que ce modèle de souris humanisée soit capable de rétablir ses
fonctions dans divers tissus épithéliaux, il est incapable de soutenir la structuration d'une MBS
à l'interface entre les améloblastes et l’émail en maturation. Cet échec peut être lié à la
composition spécifique de la MBS dans la phase de maturation et supporte l’hypothèse que la
MBS est essentielle pour la maturation adéquate de l'émail. / The epithelial ameloblasts are separated from the maturing enamel by an atypical basement
membrane (BM) that is enriched in laminin 332 (LM-332). This heterotrimeric protein (α3, ß3
and γ2 chains) provides structural integrity to BMs and influences various epithelial cell
processes including cell adhesion and differentiation.
Mouse models that lack expression of individual LM-332 chains die shortly after birth. The
lethal phenotype of laminin γ2 knockout mice can be rescued by human laminin γ2 (LAMC2)
expressed using a doxycycline-inducible (Tet-on) cytokeratin 14 promoter-rtTA. These
otherwise normal-looking rescued mice exhibit white spot lesions on incisors.
We therefore investigated the effect of rescue with human LAMC2 on enamel maturation and
structuring of the atypical BM. The maturation stage enamel organ in transgenic mice was
severely altered as compared to wild type controls, a structured BM was no longer discernible,
dystrophic matrix appeared in the maturing enamel layer, and there was residual enamel matrix
late into the maturation stage. Microtomographic scans revealed excessive wear of occlusal
surfaces on molars, chipping of enamel on incisor tips, and hypomineralization of the enamel
layer. No structural alterations were observed at other epithelial sites, such as skin, palate and
tongue. These results indicate that while this humanized mouse model is capable of rescue in
various epithelial tissues, it is unable to sustain structuring of a proper BM at the interface
between ameloblasts and maturing enamel. This failure may be related to the atypical
composition of the BM in the maturation stage and reaffirms that the atypical BM is essential
for enamel maturation.
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Nouveaux modèles d’étude de la Granulomatose Septique Chronique grâce aux cellules souches pluripotentes induites – Application au développement de la thérapie protéique / New study models of Chronic Granulomatous Disease using the induced pluripotent stem cells - Application to the development of protein therapyBrault, Julie 17 December 2015 (has links)
La Granulomatose Septique Chronique (CGD) est une maladie génétique rare de l’immunodéficience innée affectant les cellules phagocytaires (neutrophiles, macrophages). Elle est causée par des mutations dans les sous-unités du complexe NADPH oxydase formé du cytochrome b558 membranaire (NOX2 associé à p22phox) et de facteurs cytosoliques (p47phox, p67phox et p40phox). La déficience de ce complexe enzymatique va conduire à l’absence de formation de formes réactives de l’oxygène (FRO) microbicides et donc à l’apparition d’infections graves et récurrentes très tôt dans l’enfance. La chimioprophylaxie à vie permet de protéger ces patients mais peut être responsable d’effets indésirables. La seule thérapie curative est la transplantation de moelle osseuse mais tous les patients ne peuvent en bénéficier, et la thérapie génique n’est pas encore envisageable. Il y a donc un manque réel de nouvelles thérapies pour cette maladie. Cependant pour développer de nouveaux traitements, il faut disposer de modèles physiopathologiques pertinents. Or, les modèles existants sont imparfaits ou manquants. Le but de notre travail est donc de produire des modèles cellulaires et animaux de la CGD pour développer dans un second temps, une nouvelle approche thérapeutique basée sur l’utilisation de protéoliposomes.Grâce à leurs propriétés de pluripotence et d’auto-renouvellement à l’infini, les cellules souches pluripotentes induites (iPS) sont un outil puissant pour la modélisation physiopathologique. Ainsi, à partir de fibroblastes de patients atteints de CGD reprogrammés en cellules iPS, nous avons mis au point un protocole efficace de différenciation hématopoïétique in vitro en neutrophiles et macrophages. Nous avons montré que ces cellules phagocytaires sont matures et reproduisent parfaitement le phénotype déficient en FRO des patients CGD. Nous avons donc obtenu des modèles cellulaires pertinent modélisant trois formes génétiques de CGD, la CGD liée à l’X et deux formes autosomiques récessives, CGDAR22 et CGDAR47.Nous avons ensuite réalisé la preuve du concept de l’efficacité de protéoliposomes thérapeutiques sur les macrophages modélisés de la forme CGDX, la forme génétique la plus fréquente (70 % des cas) due à l’absence du cytochrome b558 membranaire (NOX2/p22phox). Grâce à une collaboration avec la start-up Synthelis SAS, des liposomes contenant le cytochrome b558 au niveau de la membrane lipidique ont été produits dans un système d’expression acellulaire basé sur l’utilisation d’extraits d’Escherichia coli. Ces liposomes NOX2/p22phox sont capables de reconstituer une enzyme NADPH oxydase fonctionnelle in vitro et de délivrer le cytochrome b558 à la membrane plasmique des macrophages CGDX qui présentent alors une restauration de l’activité NADPH oxydase avec la production de FRO.Enfin, nous nous sommes proposés de générer des souris dites « humanisées » par transplantation de cellules souches hématopoïétiques CD34+ capables de prise de greffe et de reconstitution hématopoïétique dans des souris immunodéficientes. A partir de cellules iPS saines, nous avons réussi à produire des cellules hématopoïétiques CD34+ possédant un potentiel hématopoïétique in vitro. Cependant, malgré des résultats encourageants, aucune prise de greffe in vivo n’a pu être réellement confirmée à ce jour.Pour conclure, nous avons donc montré au cours de ce projet, la production de modèles cellulaires de trois formes génétiques de CGD à partir de cellules iPS. Puis le modèle de macrophages CGDX nous a permis de faire la preuve de l’efficacité d’une nouvelle thérapie in vitro, une « enzymothérapie substitutive liposomale », qui pourrait à terme, offrir une alternative thérapeutique pour le traitement des infections aigües pulmonaires des patients CGD réfractaires aux traitements antibiotiques et antifongiques conventionnels. / Chronic Granulomatous Disease (CGD) is a rare inherited pathology of the innate immune system that affects the phagocytic cells (neutrophils, macrophages). This disease is caused by mutations in the subunits of the NADPH oxidase complex composed of the membrane cytochrome b558 (NOX2 associated with p22phox) and the cytosolic components (p47phox, p67phox et p40phox). Dysfunction in this enzymatic complex leads to the absence of microbicidal reactive oxygen species (ROS) and therefore to the development of recurrent and life-threatening infections in early childhood. Life-long prophylaxis is used to protect these patients but it may be responsible for side effects. Bone marrow transplantation is the only curative treatment but it can not be proposed to all the patients. In addition, gene therapy is not possible up to now. So there is a real lack of new therapies for this disease. However, to develop new therapeutic approaches, relevant physiopathological models must be available. Actually, existing models are imperfect or missing. Thus, the goal of our work is to produce cellular and animal models of CGD to develop a new proteoliposome-based therapy.Induced pluripotent stem cells (iPSCs) are a powerful tool for physiopathologic modeling due to their pluripotency and self-renewal properties. Using CGD patient-specific iPSCs regrogrammed from fibroblasts, we developped an efficient protocol for in vitro hematopoietic differentiation into neutrophils and macrophages. We showed that the phagocytic cells produced are mature and reproduce the ROS-deficient phenotype found in CGD patients. Thus, we obtained relevant cellular models for three genetic forms of CGD: X-linked CGD and the two autosomal recessive forms AR22CGD and AR47CGD.Then, we demonstrated the proof-of-concept of the efficacy of therapeutic proteoliposomes on X-CGD iPS-derived macrophages. Indeed, X-CGD is the main form of the disease (70% of cases) and is caused by the absence of the membrane cytochrome b558 (NOX2/p22phox). Thanks to a collaboration with the start-up Synthelis SAS, liposomes integrating the cytochrome b558 into lipid bilayers were produced in an E. coli-based cell-free protein expression system. These NOX2/p22phox liposomes were able to reconstitute a functional NADPH oxidase enzyme in vitro and to deliver the cytochrome b558 at the plasma membrane of X-CGD macrophages, leading to restore the NADPH oxidase activity with a ROS production.Finally, we proposed to generate « humanized » mice models with a human immune system after transplantation of CD34+ hematopoietic stem cells able to engraft and reconstitute long-term hematopoiesis in immunodeficient mice. Using healthy iPSCs, we successfuly produced CD34+ hematopoietic cells with in vitro hematopoietic potential. However, no in vivo engraftment was really confirmed yet.In conclusion, during this project, we produced cellular models of three genetic forms of CGD using patient-specific iPSCs. Then, X-CGD macrophages were used to demonstrate in vitro the efficacy of a new therapy. This « liposomal replacement enzymotherapy » could, in the future, represents a curative alternative against life-threatening lung infections refractory to conventional antibiotic and antifungal therapy.
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La souris humanisée : modèle d'étude in vivo du processus leucémogène induit par HTLV-1 / The humanized mouse : an in vivo model for the leukemogenic process induced by HTLV-1Pérès, Eléonore 29 September 2017 (has links)
La leucémie T de l’adulte (ATL), caractérisée par une prolifération dérégulée de lymphocytesT CD4+ activés, se développe chez des individus infectés par le virus T-lymphotropehumain (HTLV-1). Une période asymptomatique de plusieurs décennies sépare l’infection del’apparition des symptômes cliniques de l’ATL, rendant complexe la compréhension des étapesinitiales de la leucémogenèse. Le modèle de la souris humanisée dans laquelle est reconstituéun système hémato-lymphoïde humain est pertinent pour étudier ces étapes, depuis l’infectionpar HTLV-1 jusqu’à l’apparition de la lymphoprolifération. Grâce à ce modèle, mes travaux dethèse ont aidé à mieux comprendre deux mécanismes importants. D’abord, le rôle du chimiotactisme dans le contact cellule infectée-cellule non infectée in vivo. En inhibant la sécrétion de leukotriène B4, un chimioattractant, dans des souris humanisées et infectées, la charge proviraleest plus faible que celle des souris témoins et la prolifération des CD4+ activés est égalementréduite, soulignant le rôle du leukotriène B4 dans la primo-infection. Ensuite, j’ai étudié l’implicationdes protéines PDZ dans le processus leucémogène in vivo. En effet, certaines de cesprotéines, dont Scribble, interagissent avec le PBM (PDZ-domain Binding Motif) de la protéinevirale Tax. Des souris humanisées ont été infectées avec un provirus soit sauvage soit muté auniveau du PBM et j’ai montré, dès 5 semaines après infection, que l’interaction de ce domaineavec des protéines PDZ augmente la prolifération des CD4+ activés et perturbe l’expression degènes impliqués dans la prolifération, l’organisation du cytosquelette et des voies de l’apoptose.Ces résultats attestent du rôle du PBM de Tax dans le soutien de la lymphoprolifération in vivo. / Human T-Cell Leukemia Virus 1 (HTLV-1) is the causative agent of Adult T-cell Leukemia(ATL) characterized by a deregulated proliferation of activated CD4+ T cells. An asymptomaticperiod of several decades separates the infection and the onset of the leukemia, complicating thestudy of the initial leukemogenic steps. Humanized mouse models are relevant to study thosesteps as these mice harbor human hemato-lymphoid cells that can be infected by HTLV-1.I used this animal model to better characterized two biological mecanisms during my thesis.First, the role of chemotaxis in infected-non infected cell contact in vivo. Inhibiting the secretionof leukotriene B4, a potent chemoattractant, in HTLV-1-infected humanized mice reduces theproviral load and the proliferation of activated CD4+ T cells. Those results establish the importanceof leukotriene B4 in HTLV-1 primo-infection. Next, I focused on the importance of thePDZ proteins in the leukemogenic process in vivo. The PDZ-domain Binding Motif (PBM) ofthe Tax viral protein interacts with several cellular PDZ proteins including Scribble. I infectedhumanized mice either with a wild-type or a PBM-mutated provirus of HTLV-1. I showed thatinteraction of the Tax PBM with PDZ proteins enhances activated CD4+ T cells proliferationfrom 5 weeks after infection and disrupts expression of genes implicated in cell proliferation,apoptotic processes and cytoskeleton organization. This study indicated that the PBM of Taxis important for sustaining the lymphoproliferation in vivo.
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Développement d'un nouveau modèle de souris humanisée de sclérose en plaquesRebillard, Rose-Marie 04 1900 (has links)
No description available.
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Investigating Immune Responses and Pathology During HIV/Mtb Co-Infection Within Humanized MiceYang, Jack (Xiaozhi) January 2022 (has links)
There are an estimated 2 billion individuals infected with Mtb, and 37.7 million people living with HIV (PLWH) worldwide. HIV/Mtb co-infection increases the risk of developing active tuberculosis by over 20-fold, and 210,000 of 1.5 million deaths from TB were among co-infected PLWH in 2020. Therefore, development of effective TB vaccination, particularly within the vulnerable PLWH population, is an urgent global issue. With limited in vivo models to study co-infection, humanized NRG (huNRG) mice and humanized DRAG-A2 mice (a next-generation of huNRG mice expressing HLA class I and II transgenes with improved human immune reconstitution, huDRAG-A2) are promising tools for HIV and TB reserach as they develop robust human immune cell populations and recapitulate many aspects of HIV or TB clinical disease. HIV/Mtb co-infection was investigated using huNRG and hu-DRAG-A2 mice in separate experiments where intravaginal (with DMPA pre-treatment) or intraperitoneal HIV-1 infection was administered, respectively, and intranasal infection of Mtb was administered 3.5 weeks later. Both huNRG and huDRAG-A2 mice recapitulated hallmark features of HIV/Mtb co-infection such as severe granuloma pathology, hCD4+ T cell depletion in lung and spleen tissue, and human like lung pathology such as Mtb-infected foamy macrophages in the granuloma. Co-infected huDRAG-A2 mice also displayed significantly higher bacterial burden in the lungs, increased extrapulmonary dissemination into spleen and liver, and significantly lower hCD4+ T cells in the peripheral blood post-Mtb infection when compared to the Mtb-only infected group. To investigate TB vaccine immunogenicity, huNRG and huDRAG-A2 mice were immunized with a novel trivalent vaccine, AdCh68MV. Upon intranasal immunization, both models showed trends of developing higher Mtb antigen-specific hCD4+ T cell responses in the lung and spleen. Overall, this project sets the initial stages of a pre-clinical HIV/Mtb co-infection model in huNRG and huDRAG-A2 mice appropriate for immune investigations, therapeutic and vaccination development. / Thesis / Master of Science in Medical Sciences (MSMS) / There are over 2 billion individuals infected with TB and 37.7 million people living with HIV (PLWH) worldwide. When someone is co-infected with both diseases, the risk of death is greatly increased. Research in co-infection and developing effective TB vaccination for PLWH are urgent global issues. Animal studies are currently limited because studying HIV requires human immune cells. Our lab has established humanized mice (hu-mice) that develop many different human immune cells and are useful for HIV/Mtb co-infection research. When hu-mice were co-infected, they showed more dying lung tissue, immune cell loss, and bacteria in the lungs. Hu-mice were also used to study human immune responses to a novel TB vaccine delivered to the lungs. Trends of higher immune responses towards TB were observed in the lung and spleen of immunized hu-mice. Overall, this project shows the utility of hu-mice as pre-clinical models of HIV/Mtb co-infection and Mtb vaccine studies.
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