60 results about "Dna transfection" patented technology

The present invention is based on the development of a dual promoter system (preferably a RNA pol I-pol II system) for the efficient intracellular synthesis of viral RNA. The resultant minimal plasmid-based system may be used to synthesize any RNA virus, preferably viruses with a negative single stranded RNA genome. The viral product of the system is produced when the plasmids of the system are introduced into a suitable host cell. One application of the system is production of attenuated, reassortant influenza viruses for use as antigens in vaccines. The reassortant viruses generated by cotransfection of plasmids may comprise genes encoding the surface glycoproteins hemagglutinin and neuramimidase from an influenza virus currently infecting the population and the internal genes from an attenuated influenza virus. An advantageous property of the present invention is its versatility; the system may be quickly and easily adapted to synthesize an attenuated version of any RNA virus. Attenuated or inactivated RNA viruses produced by the present invention may be administered to a patient in need of vaccination by any of several routes including intranasally or intramuscularly.

The invention discloses high-strength photosensitive hydrogel as well as a preparation method and application thereof. The high-strength photosensitive hydrogel is formed by free radical polymerization copolymerization of polyethylene glycol methacrylic ester, 2-vinyl-4,6-diamino-1,3,5-triazine and a double-bond-containing monomer with a spiropyrane structure; the three monomers and an initiator are dissolved in a solvent, unsaturated bonds on the molecules of the monomers are initiated by the initiator, and the hydrogel is prepared through free radical polymerization reaction. The photosensitive hydrogel disclosed by the invention has higher stretching resistance and compression resistance, and has good biocompatibility. Moreover, the hydrogel has the capability of adsorbing DNA (Deoxyribonucleic Acid) transfection cells as well as adjusting attaching and un-attaching behaviors of the cells by illumination.

A process of producing a protein of interest by expression of said protein of interest from a sequence of interest in a plant or in plant leaves, comprising: (a) transfecting said plant or said plant leaves by infiltrating said plant or said plant leaves with an Agrobacterium strain in the presence of a complementing factor, said Agrobacterium strain containing in T-DNA a heterologous DNA sequence having a sequence portion encoding a replicon, wherein said sequence encoding a replicon contains sequences necessary for replicon function of said replicon, said sequences being derived from a plant virus, and said sequence of interest to be expressed from said replicon, (b) optionally isolating said protein of interest from said plant or said plant leaves infiltrated in step (a), wherein said Agrobacterium strain is provided with a first genetic modification rendering said Agrobacterium strain defective for transfecting organisms with said T-DNA in the absence of said complementing factor.

Human / human hybrid cells were made via fusion of human embryonic kidney cells (293S) and modified Burkitt's lymphoma cells (2B8). The fusion cells are useful as host cells for the recombinant expression of mammalian genes. The advantages of using these hybrid clones of human kidney- and B-cells, called HKBs, for mammalian gene expression, include (i) the cells are negative for immunoglobulin expression, (ii) the cells grow easily in plasma protein-free medium (with or without the addition of recombinant insulin) as suspension cultures in a shake flask or in a fermenter (iii) the cells are very susceptible for transfection of DNA, and (iv) the cells secrete high levels of heterologous recombinant proteins, such as recombinant monoclonal antibodies, soluble ICAM-1, rIL-4, and rFVIII.