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2015 ; 6
(40
): 42838-53
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
HOXB9 induction of mesenchymal-to-epithelial transition in gastric carcinoma is
negatively regulated by its hexapeptide motif
#MMPMID26536658
Chang Q
; Zhang L
; He C
; Zhang B
; Zhang J
; Liu B
; Zeng N
; Zhu Z
Oncotarget
2015[Dec]; 6
(40
): 42838-53
PMID26536658
show ga
HOXB9, a transcription factor, plays an important role in development. While
HOXB9 has been implicated in tumorigenesis and metastasis, its mechanisms are
variable and its role in gastric carcinoma (GC) remains unclear. In the present
study, we demonstrated that the expression of HOXB9 decreased in gastric
carcinoma and was associated with malignancy and metastasis. Re-expression of
HOXB9 in gastric cell lines resulted in the suppression of cell proliferation,
migration, and invasion, which was accompanied by the induction of
mesenchymal-to-epithelial transition (MET). Comparative sequence analysis and
examination of a HOXB9 structural model indicated that three sites might possibly
be involved in MET regulation. The in vitro study of HOXB9 mutants showed that
these were unable to inhibit MET induction. However, when overexpressing a HOXB9
mutant lacking the hexapeptide motif, a more potent MET induction and tumor
suppression was observed compared to that of the wild-type, indicating that the
presence of the hexapeptide motif reduced HOXB9 MET induction and tumor
suppression activity. Therefore, the results of the present study suggested that
HOXB9 is a tumor suppressor in gastric carcinoma, and its activity was controlled
by different regulatory mechanisms such as the hexapeptide motif as a "brake" in
this case. The results of these regulatory effects could lead to either oncogenic
or tumor suppressive roles of HOXB9, depending on the context of the particular
type of cancer involved.