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Production of transferrin by human cell lines in a defined protein‐free system: Detection by ELISA
Author(s) -
KRIEGERBECKOVÁ K.,
KOVÁŘ J.,
NEUMANNOVÁ V.
Publication year - 1993
Publication title -
immunology and cell biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.999
H-Index - 104
eISSN - 1440-1711
pISSN - 0818-9641
DOI - 10.1038/icb.1993.35
Subject(s) - transferrin , cell culture , microbiology and biotechnology , polyclonal antibodies , raji cell , monoclonal antibody , immunoassay , chemistry , intracellular , biology , antibody , biochemistry , immunology , genetics
Summary A double sandwich enzyme immunoassay using a combination of two polyclonal and one monoclonal antibodies was developed to quantitate transferrin in various human cell lines (U 937, K 562, Jiyoye, Jurkat, Raji, THP‐1, HeLa) and transferrin secreted by these cells cultured in a defined protein‐free medium. In the developed assay the measurable range in our experimental system is 1 to 25 ng/mL of human transferrin and the interassay coefficient of variation ranged from 11.3 to 16.1%. The assay is specific for both transferrin and apotransferrin with the same sensitivity. Intracellular transferrin levels in all the cell lines tested were < 1 ng/10 6 cells. The highest level of transferrin was found in cells of the histiocytic line U 937 (0.84± 0.18 ng/10 6 cells). Only this cell line secreted transferrin in amounts > 1 ng/10 6 cells per day, i.e. 15.8 ± 2.3 ng/10 6 cells per day. Intracellular transferrin was also demonstrated by immunoblotting.