Apoptosis and growth inhibition of head and neck tumor cell line induced by epidermal growth factor receptor tyrosine kinase inhibitor.

Abstract:

:Overexpression of the epidermal growth factor (EGF) receptor, a hallmark of aerodigestive squamous cell carcinoma of the head and neck (SCCHN), correlates with aggressive tumor behavior. There is evidence that SCCHN cells auto-activate their EGF receptors. The receptor has therefore attracted interest as a potential therapeutic target. We tested the in vitro therapeutic efficacy of PD153035--a potent, specific inhibitor of the tyrosine kinase intrinsic to the EGF receptor--by employing a well-characterized cell line derived from human gingival SCCHN. DNA-synthesis and cell number were assayed for growth-inhibitory effects, phosphorylation of the EGF receptor was quantitated by immunoblot, and cell apoptosis was detected by terminal deoxytransferase (TdT)-mediated deoxyuridine triphosphate (dUTP)-biotin nick end labeling (TUNEL) in situ assay. PD153035, at nanomolar concentrations, inhibited autophosphorylation of the EGF receptor induced by EGF stimulation and the inhibition occurred in a dose-dependent manner. Under the same conditions, PD153035 inhibited cell growth, and induced apoptosis of SCCHN cells in vitro. We conclude that selective inhibition of the EGF receptor tyrosine kinase completely abolishes EGF receptor phosphorylation resulting from receptor stimulation, and results in growth inhibition and apoptosis of SCCHN cells in vitro. By inducing cytostasis and apoptosis, this new class of inhibitors may be of therapeutic value against SCCHN.

journal_name

Oral Oncol

journal_title

Oral oncology

authors

Faust RA,Tawfic S,Davis AT,Ahmed K

doi

10.1016/s1368-8375(98)00118-3

subject

Has Abstract

pub_date

1999-05-01 00:00:00

pages

290-5

issue

3

eissn

1368-8375

issn

1879-0593

pii

S1368-8375(98)00118-3

journal_volume

35

pub_type

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