31 research outputs found

    Antitumor responses stimulated by dendritic cells are improved by triiodothyronine binding to the thyroid hormone receptor β

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    Bidirectional cross-talk between the neuroendocrine and immune systems orchestrates immune responses in both physiologic and pathologic settings. In this study, we provide in vivo evidence of a critical role for the thyroid hormone triiodothyronine (T3) in controlling the maturation and antitumor functions of dendritic cells (DC). We used a thyroid hormone receptor (TR) β mutant mouse (TRβPV) to establish the relevance of the T3-TRβ system in vivo. In this model, TRβ signaling endowed DCs with the ability to stimulate antigen-specific cytotoxic T-cell responses during tumor development. T3 binding to TRβ increased DC viability and augmented DC migration to lymph nodes. Moreover, T3 stimulated the ability of DCs to cross-present antigens and to stimulate cytotoxic T-cell responses. In a B16-OVA mouse model of melanoma, vaccination with T3-stimulated DCs inhibited tumor growth and prolonged host survival, in part by promoting the generation of IFNγ-producing CD8(+) T cells. Overall, our results establish an adjuvant effect of T3-TRβ signaling in DCs, suggesting an immediately translatable method to empower DC vaccination approaches for cancer immunotherapy.Fil: Alamino, Vanina Alejandra. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Centro de Investigaciones En Bioquímica Clínica E Inmunología; ArgentinaFil: Mascanfroni, Ivan Darío. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Centro de Investigaciones En Bioquímica Clínica E Inmunología; ArgentinaFil: Montesinos, Maria del Mar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Centro de Investigaciones En Bioquímica Clínica E Inmunología; ArgentinaFil: Gigena, Nicolás. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Centro de Investigaciones En Bioquímica Clínica E Inmunología; ArgentinaFil: Donadio, Ana Carolina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Centro de Investigaciones En Bioquímica Clínica E Inmunología; ArgentinaFil: Blidner, Ada Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); ArgentinaFil: Milotich, Sonia I.. Hospital Materno-Neonatal Ramon Carrillo; ArgentinaFil: Cheng, Sheue Yann. National Institutes Of Health. National Cancer Institute; Estados UnidosFil: Masini Repiso, Ana M.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Centro de Investigaciones En Bioquímica Clínica E Inmunología; ArgentinaFil: Rabinovich, Gabriel Adrian. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); ArgentinaFil: Pellizas, Claudia Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Centro de Investigaciones En Bioquímica Clínica E Inmunología; Argentin

    Galectin-1 Deactivates Classically Activated Microglia and Protects from Inflammation-Induced Neurodegeneration

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    SummaryInflammation-mediated neurodegeneration occurs in the acute and the chronic phases of multiple sclerosis (MS) and its animal model, experimental autoimmune encephalomyelitis (EAE). Classically activated (M1) microglia are key players mediating this process. Here, we identified Galectin-1 (Gal1), an endogenous glycan-binding protein, as a pivotal regulator of M1 microglial activation that targets the activation of p38MAPK-, CREB-, and NF-κB-dependent signaling pathways and hierarchically suppresses downstream proinflammatory mediators, such as iNOS, TNF, and CCL2. Gal1 bound to core 2 O-glycans on CD45, favoring retention of this glycoprotein on the microglial cell surface and augmenting its phosphatase activity and inhibitory function. Gal1 was highly expressed in the acute phase of EAE, and its targeted deletion resulted in pronounced inflammation-induced neurodegeneration. Adoptive transfer of Gal1-secreting astrocytes or administration of recombinant Gal1 suppressed EAE through mechanisms involving microglial deactivation. Thus, Gal1-glycan interactions are essential in tempering microglial activation, brain inflammation, and neurodegeneration, with critical therapeutic implications for MS

    Glicômica da resposta imune: o universo de glicanos e lectinas em microambientes inflamatórios e neoplásicos

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    Las galectinas, una familia de lectinas que reconocen glico-conjugados específicos en la superficie celular y la matriz, participan en diversos procesos biológicos como reguladores de la ho-meostasis de la respuesta inmune y de la progresión tumoral. Considerando el papel inmunomodulador de Galectina-1 (Gal-1) en modelos de inflamación crónica y su contribución a la creación de microambientes tolerogénicos, durante los últimos años exploramos el impacto de esta proteína sobre el balance de células T y la funcionalidad de células dendríticas (CDs). Mientras las células Th1 y Th17 poseen el repertorio de glicanos necesarios para la unión de Gal-1, los linfocitos Th2 son resistentes a la unión de esta proteína, lo cual explicaría el incremento en la susceptibilidad de los linfocitos Th1 y Th17 a la apoptosis inducida por Gal-1 y la consecuente desviación en el balance de la respuesta inmune hacia un perfil Th2. Además, identificamos un circuito tolerogénico en el que Gal‐1 induce la diferenciación de CDs tolerogénicas productoras de IL‐27, la consecuente expansión de células T regulatorias productoras de IL‐10 y la supresión de la inflamación mediada por células Th1 y Th17. Postulamos un nuevo mecanismo de regulación homeostática de la respuesta inmune basado en la interacción entre Gal‐1 y sus gli-canos específicos, el cual permite anticipar nuevos horizontes terapéuticos, en los que la modulación de la expresión de Gal‐1 o sus glicanos nos permitiría regular la respuesta inmune.Galectins, a family of endogenous glycan-binding proteins able to recognize specific glycoconjugates on cell surface and extracellular matrix, control critical immunological processes involved in immune homeostasis and tumor progression. Given the immunosuppressive role of Galectin-1 (Gal-1) in different models of chronic inflammation and its contribution to the creation of tolerogenic microenvironments in cancer and pregnancy models, the impact of this protein on T helper cell balance and dendritic cells (DCs) functionality was explored. A novel mechanism, based on the differential glycosylation of T helper cell subsets, by which Gal-1 preferentially eliminates antigen-specific Th1 and Th17 cells, leading to a shift toward a Th2 profile was identified. While Th1- and Th-17-differentiated cells expressed the repertoire of cell surface glycans that are critical for Gal-1-induced cell death, Th2 cells are protected from Gal-1 through differential sialylation of cell surface glycoproteins. More recently, the ability of Gal-1 to trigger the differentiation of tolerogenic dendritic cells (DCs), which promote resolution of autoimmune inflammation, was demonstrated. A tolerogenic circuit linking Gal-1 signaling, IL-27-producing DCs and IL-10-secreting T cells was identified. It can be postulated that molecular interactions between endogenous galectins and specific glycans constitute a novel mechanism of homeostatic regulation of immune responses. Understanding the role of protein-glycan interactions in the establishment of tolerogenic or inflammatory programs will enable the design of more rational immunotherapeutic strategies with broad biomedical implications.As galectinas, uma família de lectinas que reconhecem gli-coconjugados específicos na superfície celular e a matriz, participam em diversos processos biológicos como reguladores da homeostase da resposta imune e da progressão tu-moral. Considerando o papel imunomodulador de Galec-tina-1 (Gal-1) em modelos de inflamação crônica e sua contribuição à criação de microambientes tolerogênicos, durante os últimos anos exploramos o impacto desta proteína sobre o balanço de células T e a funcionalidade de células dendríticas (CDs). Enquanto as células Th1 e Th17 possuem o repertório de glicanos necessários para a união de Gal-1, os linfócitos Th2 são resistentes à união desta proteína, o qual explicaria o incremento na suscetibilidade dos linfóci-tos Th1 e Th17 à apoptose induzida por Gal-1 e o conse-guinte desvio no balanço da resposta imune para um perfil Th2. Além disso, identificamos um circuito tolerogênico no qual Gal‐1 induz a diferenciação de CDs tolerogênicas pro-dutoras de IL‐27, a conseguinte expansão de células T re-gulatórias produtoras de IL‐10 e a supressão da inflamação mediada por células Th1 e Th17. Postulamos um novo mecanismo de regulação homeostática da resposta imune ba-seado na interação entre Gal‐1 e seus glicanos específicos, que permite antecipar novos horizontes terapêuticos, nos quais a modulação da expressão de Gal‐1 ou seus glicanos nos permitiria regular a resposta imune.Fil: Sundblad, Victoria. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); Argentina; ArgentinaFil: Cerliani, Juan Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); Argentina; ArgentinaFil: Compagno, Daniel Georges. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales; ArgentinaFil: Croci Russo, Diego Omar. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); Argentina; ArgentinaFil: D'alotto Moreno, Tomas. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); Argentina; ArgentinaFil: Dergan Dylon, Leonardo Sebastian. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); Argentina; ArgentinaFil: Di Lella, Santiago. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); Argentina; ArgentinaFil: Gatto, Claudia. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones en Ingeniería Genética y Biología Molecular; ArgentinaFil: Gentilini, Lucas Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); Argentina; ArgentinaFil: Giribaldi, María Laura. Universidad de Buenos Aires. Facultad de Cs.exactas y Naturales. Departamento de Quimica Biologica. Laboratorio de Analisis Biologicos E Inmunoquimica; ArgentinaFil: Guardia, Carlos Manuel Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); Argentina; ArgentinaFil: Ilarregui, Juan Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); Argentina; ArgentinaFil: Laderach, Diego Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales; ArgentinaFil: Martínez Allo, Verónica Candela. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); Argentina; ArgentinaFil: Mascanfroni, Ivan Darío. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); Argentina; ArgentinaFil: Mendez Huergo, Santiago Patricio. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); Argentina; ArgentinaFil: Salatino, Mariana. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); Argentina; ArgentinaFil: Stupirski, Juan Carlos. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); Argentina; ArgentinaFil: Toscano, Marta Alicia. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); Argentina; ArgentinaFil: Rabinovich, Gabriel Adrian. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); Argentina; Argentin

    Expanding the universe of cytokines and pattern recognition receptors: galectins and glycans in innate immunity

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    Effective immunity relies on the recognition of pathogens and tumors by innate immune cells through diverse pattern recognition receptors (PRRs) that lead to initiation of signaling processes and secretion of pro- and anti-inflammatory cytokines. Galectins, a family of endogenous lectins widely expressed in infected and neoplastic tissues have emerged as part of the portfolio of soluble mediators and pattern recognition receptors responsible for eliciting and controlling innate immunity. These highly conserved glycan-binding proteins can control immune cell processes through binding to specific glycan structures on pathogens and tumors or by acting intracellularly via modulation of selective signaling pathways. Recent findings demonstrate that various galectin family members influence the fate and physiology of different innate immune cells including polymorphonuclear neutrophils, mast cells, macrophages, and dendritic cells. Moreover, several pathogens may actually utilize galectins as a mechanism of host invasion. In this review, we aim to highlight and integrate recent discoveries that have led to our current understanding of the role of galectins in host-pathogen interactions and innate immunity. Challenges for the future will embrace the rational manipulation of galectin-glycan interactions to instruct and shape innate immunity during microbial infections, inflammation, and cancer.Fil: Cerliani, Juan Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); Argentina; ArgentinaFil: Stowel, Sean R.. University Of Emory; Estados UnidosFil: Mascanfroni, Ivan Darío. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); Argentina; ArgentinaFil: Arthur, Connie M.. University Of Emory; Estados UnidosFil: Cummings, Richard D.. University Of Emory; Estados UnidosFil: Rabinovich, Gabriel Adrian. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); Argentina; Argentin

    Differential response of myeloid-derived suppressor cells to the nonsteroidal anti-inflammatory agent indomethacin in tumor-associated and tumor-free microenvironments

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    Myeloid-derived suppressor cells (MDSCs) are key regulatory cells that control inflammation and promote tumor-immune escape. To date, no specific immunomodulatory drug has proven efficacy in targeting the expansion and/or function of these cells in different pathophysiologic settings. In this study, we identified a context-dependent effect of the nonsteroidal anti-inflammatory drug indomethacin (IND) on MDSCs, depending on whether they were derived from tumor microenvironments (TME) or from tumor-free microenvironments (TFME). Treatment of mice bearing the LP07 lung adenocarcinoma with IND inhibited the suppressive activity of splenic MDSCs, which restrained tumor growth through mechanisms involving CD8(+) T cells. The same effect was observed when MDSCs were treated with IND and conditioned media from LP07 tumor cells in vitro. However, in the absence of a tumor context, IND enhanced the intrinsic suppressive function of MDSCs and amplified their protumoral activity. In a model of autoimmune neuroinflammation, IND-treated MDSCs differentiated in TFME attenuated inflammation, whereas IND-treated MDSCs differentiated in TME aggravated clinical symptoms and delayed resolution of the disease. Mechanistically, IND reduced arginase activity as well as NO and reactive oxygen species production in MDSCs differentiated in TME but not in TFME. Moreover, expression of the C/EBP-â transcription factor isoforms correlated with the suppressive activity of IND-treated MDSCs. Our study unveils the dual and context-dependent action of IND, a drug that serves both as an anti-inflammatory and anticancer agent, which differentially affects MDSC activity whether these cells are derived from TME or TFME. These results have broad clinical implication in cancer, chronic inflammation and autoimmunityFil: Blidner, Ada Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; Argentina. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Oncología "Ángel H. Roffo"; ArgentinaFil: Salatino, Mariana. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; ArgentinaFil: Mascanfroni, Ivan Darío. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; ArgentinaFil: Diament, Miriam. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Oncología "Ángel H. Roffo"; ArgentinaFil: Bal, Elisa Dora. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Oncología "Ángel H. Roffo"; ArgentinaFil: Maria A. Jasnis. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Oncología "Ángel H. Roffo"; ArgentinaFil: Slobodanka M. Klein. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Oncología "Ángel H. Roffo"; ArgentinaFil: Rabinovich, Gabriel Adrián. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentin

    Endogenous lectins shape the function of dendritic cells and tailor adaptive immunity: Mechanisms and biomedical applications

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    In spite of their central role in orchestrating immunity, dendritic cells (DCs) can also limit harmful reactions and promote immune tolerance by inducing T cell anergy or favoring the differentiation of T regulatory (Treg) cells. Several factors may influence the ‘decision’ of DCs to become immunogenic or tolerogenic including the nature of antigenic challenge, the engagement of selective pathogen recognition receptors (PRRs) and the balance of cytokines and growth factors. In addition, mounting evidence indicates a key role of endogenous lectins including C-type lectins, siglecs and galectins in shaping DC immunogenicity and tailoring adaptive immune responses, through recognition of specific ‘glycan signatures’ on invading pathogens or host cells. While galectins are in general secreted proteins that act in a paracrine or autocrine manner, all known siglecs and most C-type lectins are membrane-bound receptors that convey glycan-containing information into DC differentiation or maturation programs. Yet, some of the signaling pathways triggered by endogenous lectins converge in similar functional outcomes regardless of divergences in their structure, homology or glycanbinding specificity. To gain a more complete understanding on the role of protein–glycan interactions in DC biology, here we will integrate scattered information on these structurally-divergent but functionally-related lectins and their potential biomedical applications.Fil: Mascanfroni, Ivan Darío. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); ArgentinaFil: Cerliani, Juan Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); ArgentinaFil: Dergan Dylon, Leonardo Sebastian. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); ArgentinaFil: Croci Russo, Diego Omar. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); ArgentinaFil: Ilarregui, Juan Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); ArgentinaFil: Rabinovich, Gabriel Adrian. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Química Biológica; Argentin

    Dexamethasone counteracts the immunostimulatory effects of triiodothyronine (T3) on dendritic cells

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    Glucocorticoids (GCs) are widely used as anti-inflammatory and immunosuppressive agents. Several studies have indicated the important role of dendritic cells (DCs), highly specialized antigen-presenting and immunomodulatory cells, in GC-mediated suppression of adaptive immune responses. Recently, we demonstrated that triiodothyronine (T3) has potent immunostimulatory effects on bone marrow-derived mouse DCs through a mechanism involving T3 binding to cytosolic thyroid hormone receptor (TR) betha 1,rapid and sustained Akt activation and IL-12 production. Here we explored the impact of GCs on T3-mediated DC maturation and function and the intracellular events underlying these effects. Dexamethasone(Dex), a synthetic GC, potently inhibited T3-induced stimulation of DCs by preventing the augmented expression of maturation markers and the enhanced IL-12 secretion through mechanisms involving the GC receptor. These effects were accompanied by increased IL-10 levels following exposure of T3-conditioned DCs to Dex. Accordingly, Dex inhibited the immunostimulatory capacity of T3-matured DCs on naive T-cell proliferation and IFN-gamma production while increased IL-10 synthesis by allogeneic T cell cultures. A mechanistic analysis revealed the ability of Dex to dampen T3 responses through modulation of Akt phosphorylation and cytoplasmic-nuclear shuttling of nuclear factor-kB (NF-kB). In addition,Dex decreased TRb1 expression in both immature and T3-maturated DCs through mechanisms involving the GC receptor. Thus GCs, which are increased during the resolution of inflammatory responses, counteract the immunostimulatory effects of T3 on DCs and their ability to polarize adaptive immune responses toward a T helper (Th)-1-type through mechanisms involving, at least in part, NF-kB- and TRb1-dependent pathways. Our data provide an alternative mechanism for the anti-inflammatory effects of GCs with critical implications in immunopathology at the cross-roads of the immune-endocrine circuits.Fil: Montesinos, Maria del Mar. Universidad Nacional de Córdoba; ArgentinaFil: Alamino, Vanina Alejandra. Universidad Nacional de Córdoba; ArgentinaFil: Mascanfroni, Ivan Darío. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; Argentina. Universidad Nacional de Córdoba; ArgentinaFil: Susperreguy, Sebastian. Universidad Nacional de Córdoba; ArgentinaFil: Gigena, Nicolás. Universidad Nacional de Córdoba; ArgentinaFil: Masini, Ana María. Universidad Nacional de Córdoba; ArgentinaFil: Rabinovich, Gabriel Adrián. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; Argentina. Universidad de Buenos Aires; ArgentinaFil: Pellizas, Claudia Gabriela. Universidad Nacional de Córdoba; Argentin
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