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Tsukuba, Japan

Isshiki M.,Hokkaido University | Zhang X.,Hokkaido University | Sato H.,Hokkaido University | Sato H.,RIKEN | And 3 more authors.
Vaccine | Year: 2014

Previously, we developed a vaccination regimen that involves priming with recombinant vaccinia virus LC16m8δ (rm8δ) strain followed by boosting with a Sendai virus-containing vector. This protocol induced both humoral and cellular immune responses against the HIV-1 envelope protein. The current study aims to optimize this regimen by comparing the immunogenicity and safety of two rm8δ strains that express HIV-1 Env under the control of a moderate promoter, p7.5, or a strong promoter, pSFJ1-10. m8δ-p7.5-JRCSFenv synthesized less gp160 but showed significantly higher growth potential than m8δ-pSFJ-JRCSFenv. The two different rm8δ strains induced antigen-specific immunity; however, m8δ-pSFJ-JRCSFenv elicited a stronger anti-Env antibody response whereas m8δ-p7.5-JRCSFenv induced a stronger Env-specific cytotoxic T lymphocyte response. Both strains were less virulent than the parental m8δ strain, suggesting that they would be safe for use in humans. These findings indicate the vaccine can be optimized to induce favorable immune responses (either cellular or humoral), and forms the basis for the rational design of an AIDS vaccine using recombinant vaccinia as the delivery vector. © 2013 Elsevier Ltd.

Ye L.,University of California at San Francisco | Muench M.O.,University of California at San Francisco | Muench M.O.,Blood Systems Research Institute | Fusaki N.,DNAVEC Corporation | And 7 more authors.
Stem Cells Translational Medicine | Year: 2013

The discovery of induced pluripotent stem cells (iPSCs) holds great promise for regenerative medicine since it is possible to produce patient-specific pluripotent stem cells from affected individuals for potential autologous treatment. Using nonintegrating cytoplasmic Sendai viral vectors, we generated iPSCs efficiently from adult mobilized CD34+ and peripheral blood mononuclear cells. After 5-8 passages, the Sendai viral genome could not be detected by real-time quantitative reverse transcription-polymerase chain reaction. Using the spin embryoid body method, we showed that these blood cell-derived iPSCs could efficiently be differentiated into hematopoietic stem and progenitor cells without the need of coculture with either mouse or human stromal cells. We obtained up to 40% CD34+ of which ~25% were CD34+/CD43+ hematopoietic precursors that could readily be differentiated into mature blood cells. Our study demonstrated a reproducible protocol for reprogramming blood cells into transgene-free iPSCs by the Sendai viral vector method. Maintenance of the genomic integrity of iPSCs without integration of exogenous DNA should allow the development of therapeutic-grade stem cells for regenerative medicine. © AlphaMed Press 2013.

DNAVEC Corporation | Date: 2011-08-30

The present invention provides Sendai virus vectors in which genes that encode reprograming factors for inducing pluripotent stem cells are incorporated in a specific order, compositions comprising these vectors for gene delivery to be used in the induction of pluripotent stem cells, and uses thereof. Incorporation of the KLF gene, OCT gene, and SOX gene in a specific order into a single Sendai virus vector successfully and significantly increased the efficiency of pluripotent stem cell induction. Loading multiple reprogramming factors into a single vector can further increase the induction efficiency of pluripotent stem cells while reducing the number of necessary vectors.

An objective of the present invention is to provide vectors for conveniently and efficiently producing ES-like cells in which foreign genes are not integrated into the chromosome. The present inventors discovered methods for producing ES-like cells from somatic cells using chromosomally non-integrating viral vectors. Since no foreign gene is integrated into the chromosome of the produced ES-like cells, they are advantageous in tests and research, and immunological rejection and ethical problems can be avoided in disease treatments.

Dnavec Corporation and Keio University | Date: 2011-04-15

An object of the present invention is to provide methods for producing iPS cells with low invasivity and high efficiency. The iPS cells can be produced with high efficiency using a method comprising the steps of culturing mononuclear cells derived from peripheral blood for 3 to 14 days in the presence of anti-CD3 antibody, and subjecting the cultured mononuclear cells to dedifferentiation.

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