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The rs5743836 polymorphism in TLR9 confers a population-based increased risk of...
Carvalho, Agostinho; Cunha, Cristina; Almeida, A. J.; Osório, Nuno S.; Saraiva, Margarida; Coelho, Maria Teixeira; Pedreiro, Susana; Torrado, EgídioWe are grateful to Paulo Vieira, Cecília Leão, Manuel T. Silva, Nuno Sousa, Jorge Correia- Pinto, Joana Palha, Margarida Correia-Neves, Margarida Lima and Matthew Berry for all their input throughout these studies and critical reading of the manuscript. We are grateful to the patients who joint this study as well as to all members of the Life and Health Sciences Research Institute and School of Health Sciences,...
Cellular immunity confers transient protection in experimental buruli ulcer fol...
Fraga, Alexandra G.; Martins, Teresa G.; Torrado, Egídio; Huygen, Kris; Portaels, Françoise; Silva, Manuel T.; Castro, António G.; Pedrosa, JorgeThe authors would like to thank Luís Martins and Miguel Carneiro for laboratory assistance. Author Contributions Conceived and designed the experiments: AGF AGC JP. Performed the experiments: AGF TGM ET. Analyzed the data: AGF. Contributed reagents/materials/analysis tools: FP. Wrote the paper: AGF KH FP MTS AGC JP. ; BACKGROUND: Buruli ulcer (BU) is an emerging infectious disease caused by Mycobacterium ulcer...
Mycobacterium ulcerans Triggers T-cell immunity followed by local and regional ...
Fraga, Alexandra G.; Cruz, Andrea; Martins, Teresa G.; Torrado, Egídio; Saraiva, Margarida; Pereira, Daniela Maria Ramos; Meyers, Wayne M.Buruli ulcer (BU) is a neglected infectious disease caused by Mycobacterium ulcerans, characterized by necrotic cutaneous lesions induced by the exotoxin mycolactone. Despite evidence of Th1-mediated protective immunity, M. ulcerans infection has been associated with systemic immunosuppression. We show that early during mouse infection with either mycolactone-positive or negative strains, pathogen-specific IFN-...
Dextrin nanoparticles : studies on the interaction with murine macrophages and ...
Gonçalves, Catarina; Torrado, Egídio; Martins, Teresa G.; Pereira, Paula; Pedrosa, Jorge; Gama, F. M.The uptake of nanoparticles by cells of the mononuclear phagocytic system limits its use as colloidal drug carriers, reducing the blood circulation time and the ability to reach biological targets. In this work, the interaction between dextrin nanoparticles – recently developed in our laboratory – and murine bone marrow-derived macrophages was evaluated. Cytotoxicity and nitric oxide production were studied, us...
First cultivation and characterization of mycobacterium ulcerans from the envir...
Portaels, Françoise; Meyers, Wayne M.; Ablordey, Anthony; Castro, António G.; Chemlal, Karim; Rijk, Pim de; Elsen, Pierre; Fissette, KristaBackground: Mycobacterium ulcerans disease, or Buruli ulcer (BU), is an indolent, necrotizing infection of skin, subcutaneous tissue and, occasionally, bones. It is the third most common human mycobacteriosis worldwide, after tuberculosis and leprosy. There is evidence that M. ulcerans is an environmental pathogen transmitted to humans from aquatic niches; however, well-characterized pure cultures of M. ulceran...
Cellular immune response to experimental infections with mycobacteria with diff...
Torrado, EgídioTese de doutoramento em Ciências da Saúde – Ciências Biológicas e Biomédicas. ; Mycobacterium ulcerans is the etiological agent of Buruli ulcer (BU), a serious tropical, necrotizing skin disease that can cause terrible deformities and disabilities if not treated at early stages. This pathogen was first identified in 1948 by MacCallum and colleagues in Australia; however, until the last decade, BU has received ...
Cutting edge : IFN-γ regulates the induction and expansion of IL-17-producing C...
Cruz, Andrea; Khader, Shabaana A.; Torrado, Egídio; Fraga, Alexandra G.; Pearl, John E.; Pedrosa, Jorge; Cooper, Andrea M.; Castro, António G.T cell responses are important to the control of infection but are deleterious if not regulated. IFN-γ-deficient mice infected with mycobacteria exhibit enhanced accumulation of activated effector T cells and neutrophils within granulomatous lesions. These cells do not control bacterial growth and compromise the integrity of the infected tissue. We show that IFN-γ-deficient mice have increased numbers of IL-17-...
Infection with Mycobacterium ulcerans induces persistent inflammatory responses...
Oliveira, Martinha S.; Fraga, Alexandra G.; Torrado, Egídio; Castro, António G.; Pereira, João P.; Longatto Filho, Adhemar; Milanezi, FernandaBuruli ulcer (BU) is a devastating, necrotizing, tropical skin disease caused by infections with Mycobacterium ulcerans. In contrast to other mycobacterioses, BU has been associated with minimal or absent inflammation. However, here we show that in the mouse M. ulcerans induces persistent inflammatory responses with viru-lence- dependent patterns. Mycolactone-positive, cytotoxic strains are virulent for mice an...
Protection against systemic candidiasis in mice immunized with secreted asparti...
Vilanova, Manuel; Teixeira, Luzia; Caramalho, Íris; Torrado, Egídio; Marques, Andreia; Madureira, Pedro; Ribeiro, Adília; Ferreira, Paula; Gama, F. M.Secreted aspartic proteinases (Sap) have been described as virulence factors implicated in the mechanisms of host colonization by the yeast Candida albicans in different types of candidiasis. Intraperitoneal inoculation of C. albicans into BALB/c mice rapidly leads to systemic candidiasis, with significant colonization of the kidneys measurable in the following week. In this study we assessed the potential of v...
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