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2017 ; 14
(5
): 6203-6209
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JAB1-STAT3 activation loop is associated with recurrence following
5-fluorouracil-based adjuvant chemotherapy in human colorectal cancer
#MMPMID29113268
Kugimiya N
; Nishimoto A
; Hosoyama T
; Ueno K
; Takemoto Y
; Harada E
; Enoki T
; Hamano K
Oncol Lett
2017[Nov]; 14
(5
): 6203-6209
PMID29113268
show ga
Jun activation domain-binding protein 1 (JAB1) has been shown to have multiple
roles in tumorigenesis, including the degradation of tumor suppressor proteins
such as p53, Smad7, Runx3 and the cyclin-dependent kinase inhibitor p27(Kip1),
and the activation of oncogenic transcription factors, such as c-Jun and
hypoxia-inducible factor-1?. In addition, our previous study revealed that JAB1
positively regulates signal transducer and activator of transcription 3 (STAT3)
DNA-binding activity in human colon cancer cells. In turn, the oncogenic
transcription factor STAT3 positively regulates JAB1 expression, indicative of a
positive feedback loop. Furthermore, high JAB1 expression is associated with a
poor prognosis in numerous malignant carcinomas. However, the association between
JAB1 expression and prognosis in colorectal cancer remains unclear. The aim of
the present study was to elucidate the association between JAB1 and STAT3
expression and recurrence in colorectal cancer. In the present study, it was
found that high JAB1 expression in primary colorectal cancer tissues is an
independent predictor of recurrence following 5-fluorouracil (5-FU)-based
adjuvant chemotherapy in colorectal cancer patients, and that high expression of
both JAB1 and STAT3 in primary colorectal cancer tissues is associated with a
lower recurrence-free survival rate following 5-FU-based adjuvant chemotherapy
compared to high expression of only JAB1 or STAT3. Overall, these results suggest
that JAB1 is a novel predictive marker of recurrence following 5-FU-based
adjuvant chemotherapy in colorectal cancer patients, and that the JAB1-STAT3
activation loop may be a potential therapeutic target in recurrent colorectal
cancer following 5-FU-based adjuvant chemotherapy.