Treatment with HER-2 phosphorylation agonists enhance tumor ability to stimulate epitope specific CTL in vitro.

Abstract:

:The transmembrane (TM) receptor encoded by the HER-2 proto-oncogene (HER-2) is amplified in several types of human carcinomas and premalignant states and provides an important target for cancer therapy. While overexpression of HER-2 should lead to increased CTL epitope formation due to the attendant increase in higher protein turnover, breast tumors are poor stimulators of CTL. In this report, we show that treatment of SKBR3.A2 tumor cells with HER-2 receptor agonists (EGF and NDF) enhanced tumor ability to activate CTL from tumor associated lymphocytes (TAL) and from T cells from peripheral blood in vitro. The enhanced ability of tumor cells to stimulate CTL was paralleled by tyrosine phosphorylation of HER-2, and its oligo-ubiquitination compared with control untreated, or TPA-treated tumor cells. Our results demonstrate that HER-2 ligands used at concentrations which induce tyrosine phosphorylation but not downregulation of the receptor can be used to enhance the ability of tumor cells to activate CTL. This may have implications for overcoming Ag ignorance and tolerance in human cancers.

journal_name

Oncol Rep

journal_title

Oncology reports

authors

Castilleja A,Ward NE,Epstein RB,Kudelka AP,Gershenson DM,Efferson CL,O'Brian CA,Ioannides CG

keywords:

subject

Has Abstract

pub_date

2002-09-01 00:00:00

pages

929-35

issue

5

eissn

1021-335X

issn

1791-2431

journal_volume

9

pub_type

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