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2015 ; 15
(ä): 99
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The pluripotency factor LIN28B is involved in oral carcinogenesis and associates
with tumor aggressiveness and unfavorable prognosis
#MMPMID26478718
Wang D
; Zhu Y
; Wang Y
; Li Z
; Yuan C
; Zhang W
; Yuan H
; Ye J
; Yang J
; Jiang H
; Cheng J
Cancer Cell Int
2015[]; 15
(ä): 99
PMID26478718
show ga
OBJECTIVE: LIN28B is a conserved RNA-binding protein critically involved in
development, cellular metabolism and tumorigenesis. It is frequently
overexpressed in human cancers and correlates with tumor aggressiveness as well
as unfavorable prognosis. However, the expression pattern and oncogenic roles of
LIN28B during oral squamous cell carcinoma (OSCC) development and progression has
not been well established yet. Here, we sought to determine the expression of
LIN28B and its clinical significance using chemical-induced OSCC animal model,
cell lines and primary specimens. METHOD: The OSCC animal model was induced using
7,12-dimethyl-1,2-bezan-tracene (DMBA) painting in the hamster buccal pouch.
Buccal lesions from animals were obtained from different time points and
subjected to routine histological analyses and immunohistochemical staining of
LIN28B. The mRNA, protein abundance and subcellular localization of LIN28B was
determined in a panel of OSCC cell lines by real-time RT-PCR, western blot and
immunofluorescence. The expression levels of LIN28B in human primary OSCC samples
were further evaluated by immunohistochemical staining. Moreover, the
relationship between LIN28B and several clinicopathological parameters as well as
patients' prognosis were also assessed. RESULTS: Our results revealed that
negative or low LIN28B expression was commonly observed in normal epithelial,
whereas more LIN28B abundance was identified in epithelial dysplasia and invasive
SCC in the DMBA-induced OSCC animal model. Overexpression of LIN28B was
identified in a major fraction of OSCC samples(39/58) and significantly
associated with tumor size (P = 0.049) and advanced clinical stages (P = 0.0286).
Patients with increased LIN28B had markedly reduced overall survival as compared
to those with low LIN28B. Multivariate survival analyses further indicated that
LIN28B abundance served as an independent prognostic factor for patients' overall
survival. CONCLUSIONS: Our findings reveal that LIN28B is critically involved in
OSCC initiation and progression and aberrantly overexpressed in human OSCC. It
might represent a novel diagnostic and prognostic biomarker for oral cancer.