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Critical role of SOX2-IGF2 signaling in aggressiveness of bladder cancer.


ABSTRACT: Signaling elicited by the stem cell factors SOX2, OCT4, KLF4, and MYC not only mediates reprogramming of differentiated cells to pluripotency but has also been correlated with tumor malignancy. In this study, we found SOX2 expression signifies poor recurrence-free survival and correlates with advanced pathological grade in bladder cancer. SOX2 silencing attenuated bladder cancer cell growth, while its expression promoted cancer cell survival and proliferation. Under low-serum stress, SOX2 expression promoted AKT phosphorylation and bladder cancer cells' spheroid-forming capability. Furthermore, pharmacological inhibition of AKT phosphorylation, using MK2206, inhibited the SOX2-mediated spheroid formation of bladder cancer cells. Gene expression profiling showed that SOX2 expression, in turn, induced IGF2 expression, while SOX2 silencing inhibited IGF2 expression. Moreover, knocking down IGF2 and IGF1R diminished bladder cancer cell growth. Lastly, pharmacological inhibition of IGF1R, using linsitinib, also inhibited the SOX2-mediated spheroid formation of bladder cancer cells under low-serum stress. Our findings indicate the SOX2-IGF2 signaling affects the aggressiveness of bladder cancer cell growth. This signaling could be a promising biomarker and therapeutic target for bladder cancer intervention.

SUBMITTER: Chiu YF 

PROVIDER: S-EPMC7237425 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature

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Critical role of SOX2-IGF2 signaling in aggressiveness of bladder cancer.

Chiu Yu-Fan YF   Wu Chia-Chang CC   Kuo Ming-Han MH   Miao Chia-Cheng CC   Zheng Ming-Yi MY   Chen Pei-Yu PY   Lin Sheng-Chieh SC   Chang Junn-Liang JL   Wang Yuan-Hung YH   Chou Yu-Ting YT  

Scientific reports 20200519 1


Signaling elicited by the stem cell factors SOX2, OCT4, KLF4, and MYC not only mediates reprogramming of differentiated cells to pluripotency but has also been correlated with tumor malignancy. In this study, we found SOX2 expression signifies poor recurrence-free survival and correlates with advanced pathological grade in bladder cancer. SOX2 silencing attenuated bladder cancer cell growth, while its expression promoted cancer cell survival and proliferation. Under low-serum stress, SOX2 expres  ...[more]

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