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Novel method to create personalized immunotherapy treatments
August 06, 2008Argos Therapeutics and Université de Montréal today announced the presentation of new information on Argos'process for developing dendritic cell-based immunotherapies for HIV. Results from the study demonstrate that loading monocyte-derived dendritic cells with combinations of HIV antigen RNA stimulates the expansion of HIV-specific T cells, which attack and kill HIV-infected cells. Argos' immunotherapies are generated by the Company's Arcelis™ technology, which is a platform for creating autologous, RNA-loaded dendritic cell-based therapies perfectly matched to each patient's unique virus. These data were presented in an oral poster discussion August 5, 2008 at the XVII International AIDS Conference in Mexico City.
"A key step in the durable control of HIV infection requires enhancing the development of memory immune responses and the stimulation of potent cytotoxic T cells through therapeutic vaccination," said Charles Nicolette, Ph.D., Chief Scientific Officer of Argos. "Working with our colleagues at the Université de Montréal, we have shown that Argos' approach of transfecting dendritic cells with autologous, HIV-specific antigens effectively activates dendritic cells and enhances the HIV-specific T cell response. We believe that these results support our methods of developing potent immunotherapies that help patients' immune systems more effectively fight HIV infection."
The inability of the immune system to effectively mount a response against HIV may be caused by a defect in the maturation of T cell memory. To explore this hypothesis, researchers from Dr. Rafick-Pierre Sékaly's laboratory at the Université de Montréal and Argos tested whether modified dendritic cells, derived from monocytes of HIV-infected individuals, could correct the defective maturation of HIV-specific CD8 T-cells responsible for virus eradication. To potentially improve the magnitude and quality of the anti-HIV T-cell response, maturing dendritic cells were transfected with mRNA-encoding autologous HIV sequences combined with mRNA encoding immune modulatory molecules. These modified dendritic cells were then tested for their ability to expand and mature T cell responses in vitro.
The results of these recent assessments, presented for the first time at the International AIDS Conference in Mexico, show that this novel product induces greater proliferation, maturation and differentiation of HIV-specific CD8 cells in vitro. These properties, especially expanding memory cells, required for long term protection against pathogens, may represent an improvement worthy of future of clinical development.
"We believe that this improvement may represent a significant step forward," said Dr. Sékaly, professor of immunology at the Université de Montréal. "The fact that we can stimulate a specific, long-term immune response gives us great hope that, with additional development, we will be able to give people infected with HIV a new option to battle the virus."
University of Montreal
The results of these recent assessments, presented for the first time at the International AIDS Conference in Mexico, show that this novel product induces greater proliferation, maturation and differentiation of HIV-specific CD8 cells in vitro. These properties, especially expanding memory cells, required for long term protection against pathogens, may represent an improvement worthy of future of clinical development.
"We believe that this improvement may represent a significant step forward," said Dr. Sékaly, professor of immunology at the Université de Montréal. "The fact that we can stimulate a specific, long-term immune response gives us great hope that, with additional development, we will be able to give people infected with HIV a new option to battle the virus."
University of Montreal
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Normal Human Dendritic Cells () by Cambrex NHDC Dendritic Cells Cryopreserved Test negative for HIV-I hepatitis-B and C mycoplasma bacteria yeast and fungi Isolated from peripheral blood by apheresis and density gradient centrifugation | |
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Handbook of Dendritic Cells: Biology, Diseases and Therapies (3 Volume ) by Manfred B. Lutz (Editor), Nikolaus Romani (Editor), Alexander Steinkasserer (Editor), Ralph M. Steinman (Editor) This is the most comprehensive handbook on dendritic cells, featuring an introduction by Ralph M. Steinman and written by top experts. In three volumes, it covers all aspects from molecular cell biology to clinical applications, highlighting the role of dendritic cells in fighting cancer, virus infections, and autoimmune diseases. The first section on cell biology looks at dendritic cell development, circulating cells, T cell priming, Th1 and Th2 decision and CTL priming. A second part on dendritic cells in disease deals with parasites, bacteria, viruses, autoimmunity, allergies, asthma and cancer. The final section on therapeutic applications includes viral infections and antigen delivery. |
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Dendritic Cells, Second Edition: Biology and Clinical Applications by Michael T. Lotze (Editor), Angus W. Thomson (Editor) Dendritic Cells, 2nd Edition is the new edition of the extremely successful book published in 1998. With the volume of literature on dendritic cells doubling every year, it is almost impossible to keep up. This book provides the most up-to-date synthesis of the literature, written by the very best authors. It is essential reading for any scientist working in immunology, cell biology, infectious diseases, cancer, transplantation, genetic engineering, or the pharmaceutical/biotechnology industry. * An entirely new section on DC biology is included in this edition. Also new to this edition are chapters on: * Imaging * Interaction of dendritic cells with viruses * Dendritic cells and dendrikines, chemokines and the endothelium *... |
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Dendritic Cell Protocols (Methods in Molecular Medicine) by Stephen P. Robinson (Editor), Andrew J. Stagg (Editor) Stephen P Robinson, MD, PhD, and Andrew Satgg, PhD, have brought together a wide range of time-proven methods for studying these dendritic cells. Many of these readily reproducible techniques deal with the problem of obtaining sufficient dendritic cells for analysis, whether by isolation from a wide vareity of tissues, or from various progenitor cell populations. Other methods describe in step-by-step fashion the techniques commonly used for analyzing aspects of dendritic cells, ranging from cell migration to antigen uptake and T cell stimulation. In addition, a few techniques explore the practical challenges involved in using dendritic cells in a clinical setting to develop novel immunotherapeueutics. |
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Dendritic Cells and Virus Infection by Alexander Steinkasserer (Editor) Dendritic cells are vital to induce potent anti-viral immune responses. It will become clear to the reader that dendritic cells often play a dual role during viral infections. On the one hand they are able to mount potent antiviral immune responses, and on the other hand several viruses, including HIV-1, use DC as a vector to be transferred from the periphery to the lymph nodes where they infect their prime target. |
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