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Overexpression of the opioid growth factor receptor downregulates cell proliferation of human squamous carcinoma cells of the head and neck.

Abstract：

:The opioid growth factor (OGF) is a constitutively expressed negative growth regulator whose action is mediated by the OGF receptor (OGFr). The OGF-OGFr axis tonically regulates the growth of human squamous cell carcinoma of the head and neck (SCCHN). To examine the repercussions of amplifying OGFr in SCCHN, constructs were prepared to overexpress OGFr in SCC-1 cells; six clonal lines were examined. OGFr binding assays of clonal cells revealed a 2.4- to 8.4-fold increase in binding capacity compared to wild-type (WT) and empty vector (EV) controls; binding affinity was comparable in all groups. OGFr protein expression, as measured by quantitative immunohistochemistry and Western blotting, was increased in clonal cell lines compared to controls. Under standard growth conditions the cell number of the OGFr clonal lines was reduced by 11 to 68% from the WT group, and doubling times were 7 to 67% longer. Addition of exogenous OGF further reduced (8 to 37%) cell growth of the clonal lines. Depletion of endogenous OGF with antibodies to this peptide increased growth 2-fold in cells amplifying OGFr relative to increases of 32 and 34% for the WT and EV groups, respectively. DNA synthesis of cells overexpressing OGFr was reduced from the WT group by 46 to 75%. These data indicate that the OGF receptor is integral to cell replication of SCCHN, and support treatment modalities that amplify OGFr in order to decrease the growth of these neoplasias.

journal_name

Int J Mol Med

journal_title

International journal of molecular medicine

authors

McLaughlin PJ,Verderame MF,Hankins JL,Zagon IS

subject

Has Abstract

pub_date

2007-03-01 00:00:00

pages

421-8

issue

3

eissn

1107-3756

issn

1791-244X

journal_volume

19

pub_type

杂志文章

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