摘要:
Double-stranded cDNA is prepared from polyadenylated RNA extracted from activated human peripheral blood adherent mononuclear cells. The cDNA is inserted within a plasmid vector and then the recombinant plasmid employed to transform an appropriate host. Transformed hosts are identified and grouped into pools. Plasmid DNA prepared from these pools is hybridized with total mRNA from human peripheral blood cells. Pools of host cells that provide a positive signal from the hybrid section method are subdivided and the procedure repeated until a single positive colony is isolated. Plasmid DNA is prepared from this colony and radiolabeled for use as a probe to rescreen the cDNA library for a larger clone. Also a radiolabeled, synthetic oligonucleotide probe corresponding to a portion of the initially isolated clone is used to further screen the cDNA library for additional clones. Portions of the additional clones are then employed as labeled probes to further screen the cDNA library. By this process, a single clone spanning the entire open reading frame of the IL-1 gene was isolated as well as several other clones composing a portion of the gene. The entire open reading frame and the coding region of the IL-1 gene was inserted into expression vectors for expression of functional IL-1.
摘要:
Interleukin 1 is purified to homogeneity by use of various techniques including ion exchange chromatography and dye-ligand affinity chromatography, thereby enabling the amino acid composition of this protein to be ascertained and its amino acid sequence to be partially determined. Double-stranded cDNA is prepared from polyadenylated RNA extracted from activated human peripheral blood adherent mononuclear cells. The cDNA is inserted within a plasmid vector and then the recombinant plasmid employed to transform an appropriate host. Plasmid DNA prepared from pools of transformed hosts is hybridized with a labeled, synthetic oligonucleotide probe corresponding to a portion of the ascertained amino acid sequence of the interleukin 1 protein. Pools of host cells that provide a positive signal to the probe are identified, plated out and then employed in direct bacterial colony hybridization with the same probe, thereby to isolate the particular positive colony. Plasmid DNA is prepared from this colony and characterized by restriction enzyme mapping and sequenced. The coding region for the IL-1 gene is inserted into a shuttle vector for amplification of the vector followed by expression of functional IL-1.
摘要:
Macrophages and precursor monocytes are activated to exhibit tumoricidal activity by stimulation solely with granulocyte-macrophage colony stimulating factor. A patient suffering from tumors can be treated by direct administration of therapeutically effective quantities of activated granulocyte-macrophage colony stimulating factor. Homogeneous granulocyte-macrophage colony stimulating factor for use in activating macrophages and monocyte precursors is prepared by recombinant DNA techniques. The gene coding for granulocyte-macrophage colony stimulating factor is isolated and then recombinant protein product expressed in an appropriate expression system. The granulocyte-macrophage colony stimulating factor recovered from the expression system is purified to homogeneity by reverse phase high-performance liquid chromatography.
摘要:
Interleukin-2 receptor derived from normal and malignant cells has been purified by use of various techniques including affinity chromatography in conjunction with a monoclonal antibody directed to the receptor. The purification process also includes reversed phased high performance liquid chromatography. By these techniques, interleukin-2 receptor has been purified to homogeneity. The high purification of the interleukin-2 receptor has made possible the sequencing of the amino acid residues at the N-terminal of this protein molecule. Double-stranded cDNA is prepared from polyadenylated RNA extracted from cell lines or other sources known to produce IL-2 receptor. The cDNA is inserted within a plasmid vector and then the recombinant plasmid employed to transform an appropriate host. Transformed hosts are identified and grouped into pools. Plasmid DNA prepared from these pools is hybridized with a labeled synthetic oligonucleotide probe corresponding to a portion of the amino acid sequence of the purified IL-2 receptor. The cDNA clone isolated with the probe is characterized by restriction enzyme mapping and sequenced by chain-termination method. The particular DNA clone that actually contains the gene coding for the functional IL-2 receptor is identified by expressing the clones in COS-7 monkey kidney cells and assaying for the expressed IL-2 receptor by its ability to bind IL-2 or a monoclonal antibody directed against the IL-2 receptor.
摘要:
Macrophages and precursor monocytes are activated to exhibit tumoricidal activity by stimulation solely with granulocyte-macrophage colony stimulating factor. A patient suffering from tumors can be treated by direct administration of therapeutically effective quantities of activated granulocyte-macrophage colony stimulating factor. Homogeneous granulocyte-macrophage colony stimulating factor for use in activating macrophages and monocyte precursors is prepared by recombinant DNA techniques. The gene coding for granulocyte-macrophage colony stimulating factor is isolated and then recombinant protein product expressed in an appropriate expression system. The granulocyte-macrophage colony stimulating factor recovered from the expression system is purified to homogeneity by reverse phase high-performance liquid chromatography.