Characteristics and expression of binding sites specific for ferritin H-chain on human cell lines.

Abstract:

:Purified recombinant human ferritin composed solely of H subunit was radiolabeled and incubated with proerythroleukemic K562 human cells. A specific binding was detected, and it could be displaced only by ferritins, natural or recombinant, containing large proportion of the H subunit. The specific ferritin H-chain binding was saturable, and cells showed 17,000 to 23,000 binding sites per cell. The affinity constant measured at 37 degrees C was of 3 x 10(8) M-1. Treatment with pronase eliminated the specific binding. The binding sites were expressed in a high number during the cellular exponential phase of growth and progressively decreased to disappear when cells reached the plateau phase. Treatment of the cells with desferrioxamine increased recombinant H-ferritin binding, while iron had little effect. K562 cells induced to differentiate by hemin failed to bind ferritin H. Ferritin H-chain binding capacity is present on various cell lines such as HL60, lung cancer, and hepatoma cells. Analysis of the binding sites by western blotting showed a peptide with apparent mol wt of about 100 kd.

journal_name

Blood

journal_title

Blood

authors

Fargion S,Arosio P,Fracanzani AL,Cislaghi V,Levi S,Cozzi A,Piperno A,Fiorelli G

subject

Has Abstract

pub_date

1988-03-01 00:00:00

pages

753-7

issue

3

eissn

0006-4971

issn

1528-0020

journal_volume

71

pub_type

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