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Transferrin Receptors on Mitogen‐Stimulated Human Thymus‐Derived Lymphocytes
Author(s) -
HAMMARSTRÖM M.L.,
AXELSSON B.,
IVANSEN M.,
HAMMARSTRÖM S.,
PERLMANN P.
Publication year - 1982
Publication title -
scandinavian journal of immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.934
H-Index - 88
eISSN - 1365-3083
pISSN - 0300-9475
DOI - 10.1111/j.1365-3083.1982.tb00735.x
Subject(s) - transferrin , transferrin receptor , receptor , concanavalin a , biology , microbiology and biotechnology , antibody , cell surface receptor , biochemistry , in vitro , immunology
The appearance of transferrin receptors on mitogen‐stimulated human thymus‐derived (T) lymphocytes was studied. When indirect immunofluorescence with immunoadsorbent‐purified antitransferrin antibodies was used, ∼ 10% of resting T cells were stained. This proportion increased to 50–80% of the cells 3–4 days after stimulation with the mitogenic lectins concanavalin A (Con A) and leucoagglutinin (La) from Phaseolus vulgaris . Almost all blast cells (≥90%) were positive. Cell binding experiments with 125 I‐labelled transferrin indicated the piesence of 1–5×10 5 transferrin receptor molecules/cell with high avidity for transferrin ( K =2–12 × 10 8 1/mol). Analysis by sodium dodecyl sulphate polyacrylamide gel electrophoresis and autoradiography of cell lysates containing 125 I‐labelled T‐cell surface components revealed two surface peptides (90 kdaltons and 80 kdaltons, reducing conditions), which selectively bound to insolubilized antitransferrin antibodies. The 90‐kdalton peptide also bound to insolubilized transferrin. The 80‐kdalton peptide is most probably transferrin and the 90‐kdalton peptide the transferrin receptor. Unreduced transferrin receptor had a molecular weight of 180 kdakon. It is probably a glycoprotein, since it reacted with wheat germ agglutinin, La, and probably also Con A. The properties of the lymphocyte transferrin receptor are similar to those described for transferrin receptors on various in‐vitro‐grown transformed cells. This speaks in favour of a common receptor present on all proliferating human cells.