| 摘要 |
(1) Leukoregulin (I) in pure form and its biological sub-units are new. It regulates the physiology and growth of malignant tumour cells without affecting the growth of normal cells. (I) directly lyses tumour cells; it suppresses tumour cell proliferation; it enhances the susceptibility of tumour cells to NK cell mediated lysis; it alters tumour cell surface conformation and permeability; and it inhibits the carcinogenic transformation of normal cells. (2) Isolated concd. human (I) having a molecular wt. of 120,000-140,000 and isoelectric focussing points at pH 4.8-5.5 and 7.5-8.3 is new. It is eluted on anion exchange chromatography at 0.07-0.12 M NaCl salt conc. It is partly digested by protease but not by neuraminidase and it produces subunits on dissociation of mol. wt. 30,000-35,000. (3) Biologically active compsn. comprising an effective amt. of (I) is new. (4) Cell producing human (I) and consisting of transformed B cells or hybridoma cells is new. It is obtd. from the peripheral blood of a cancer patient who has been inoculated with a vaccine comprising viable cells from the patient's own tumour, or a culture of the cells. (5) Cells producing human (I) transformed by a transfer vector contg. the gene for (I), or a biologically subunit of it, is new. (6) Monoclonal antibody specific for (I) cell surface receptor is new. (7) Hybridoma producing the monoclonal antibody defined above is new. (8) (I) or its subunit is used in a method for treating tumour cells in tissue, the method comprising the ex-vivo exposure of tumour cells. Esp. viable bone marrow cells for use in reconstituting a patient's bone marrow are first exposed to (I) or its subunit. |
