Overexpression of the LKB1 gene inhibits lung carcinoma cell proliferation partly through degradation of c-myc protein.

Abstract:

:LKB1 encodes a serine/threonine kinase generally inactivated in human lung cancers, which mediates cancer cell proliferation, migration and differentiation, but its biological function has not been completely elucidated. In this study, we demonstrated that LKB1 was associated with a substantial reduction of c-myc expression by using an inducible LKB1 expression system in the LKB1-null lung cell line A549. Nevertheless, the reduction of the c-Myc gene expression was not accompanied by corresponding reduction of mRNAs but protein, which can be abrogated by a proteosome inhibitor (MG132), suggesting that the reduction was associated with their increased degradation rather than transcriptional controls. Our results implied that the expression of c-Myc protein decreased by LKB1 in transfected cells may be a contributory factor in the process of cell proliferation. Overexpression of the LKB1 gene could inhibit the activation of ERK1/2 and STAT3 signaling pathways involved in the cell proliferation. Thus, LKB1-induced functional operation on c-Myc in promoting cell proliferation may occur in a novel mechanism, which may be regulated by ERK1/2 and/or STAT3 signal pathways in human lung carcinoma cells. Furthermore, our results give some insights into the understanding of how LKB1 inactivation contributes to lung carcinogenesis and emphasizes the central role played by LKB1 in lung cancer development.

journal_name

Oncol Rep

journal_title

Oncology reports

authors

Liang X,Nan KJ,Li ZL,Xu QZ

doi

10.3892/or_00000305

subject

Has Abstract

pub_date

2009-04-01 00:00:00

pages

925-31

issue

4

eissn

1021-335X

issn

1791-2431

journal_volume

21

pub_type

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