| 摘要 |
Method of determining whether a substance is an inhibitor or activator of a protein whose prodn. by a cell evokes a responsive change in a phenotypic characteristic other than the level of the protein in the cell per se is claimed, which comprises (a) providing a first cell line (CLI) which produces the protein and exhibits the phenotypic response to the protein, (b) providing a second cell line (CLII) which produces the protein at a lower level than CLI or does not produce the protein at all and which exhibits the phenotypic response to the protein to a lesser degree or not at all, (c) incubating the substance with CLI and CLII and (d) comparing the phenotypic response of the CLI to the substance with the phenotypic response of the CLII to the substance. - Phenotypic changes which may be observed and compared are e.g. ability of the cells to grow in an anchorage-independent manner, to grow in soft agar, to form foci in cell culture and to take up selected strains. |
