Inhibition of growth and induction of enzyme activities in a clonal human hepatoma cell line (Li-7A): comparison of the effects of epidermal growth factor and an anti-epidermal growth factor receptor antibody.

Abstract:

:A cloned human hepatoma cell line (Li-7A), possessing epidermal growth factor (EGF) receptors numbering in the range of 10-20 pmol/10(6) cells, was inhibited in its growth by EGF as well as an antagonist monoclonal antibody (MoAb) to the EGF receptor. The mode of action of the two ligands of EGF receptors appeared to be different as indicated by the following results: 1) EGF induced marked alteration in cell morphology, whereas the antibody did not; 2) cellular protein accumulated in the EGF-treated cells but not in the antibody treated cells; and 3) ectoATPase activities were greatly enhanced in Li-7A cells treated with EGF and cholera toxin but were unaffected in cells treated with antibody and cholera toxin. The last result also suggests that expression of ectoATPase activities is under the regulation of both EGF and cholera toxin. Li-7A cells provide an additional valuable experimental system for the study of EGF action, as well as the interactive effects of EGF and cholera toxin. The enrichment of the ATPase activities in the EGF-cholera toxin-treated cells can be exploited for the detailed study and isolation of these enzymes and elucidation of their physiological functions.

journal_name

J Cell Physiol

authors

Knowles AF

doi

10.1002/jcp.1041340113

subject

Has Abstract

pub_date

1988-01-01 00:00:00

pages

109-16

issue

1

eissn

0021-9541

issn

1097-4652

journal_volume

134

pub_type

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