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RIT1 suppresses esophageal squamous cell carcinoma growth and metastasis and predicts good prognosis.


ABSTRACT: Ras-like without CAAX1 (RIT1) protein is a member of Ras family, which plays critical roles in signaling pathways and cellular process regulation. However, the role of RIT1 in esophageal squamous cell carcinoma (ESCC) is unclear. In this study, we found that the expression of RIT1 is downregulated in ESCC compared to corresponding non-tumor tissues. The low-level expression of RIT1 was correlated with poorer prognosis. Then we showed that RIT1 inhibited proliferation, invasion, and migration of ESCC cells, and silencing RIT1 by shRNA promoted tumorigenicity and metastasis in nude mice. We further demonstrated that RIT1 inhibited the malignant behaviors of ESCC through inhibiting the PI3K/AKT and MAPK pathway and epithelial-mesenchymal transition in ESCC cells. Our study also revealed that RIT1 increased drug sensitivity to cisplatin (CDDP), and this function could be carried out through downregulating stemness of ESCC. In conclusion, our study indicates for the first time that RIT1 displays tumor-suppressing functions in ESCC, and these functions were carried out by inhibiting MAPK and PI3K/AKT signaling pathway, inhibiting EMT, and downregulating cancer stemness of ESCC cells.

SUBMITTER: Feng YF 

PROVIDER: S-EPMC6197279 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature

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RIT1 suppresses esophageal squamous cell carcinoma growth and metastasis and predicts good prognosis.

Feng Yan-Fen YF   Lei Yi-Yan YY   Lu Jia-Bin JB   Xi Shao-Yan SY   Zhang Yu Y   Huang Qi-Tao QT   Wu Qiu-Liang QL   Wang Fang F  

Cell death & disease 20181022 11


Ras-like without CAAX1 (RIT1) protein is a member of Ras family, which plays critical roles in signaling pathways and cellular process regulation. However, the role of RIT1 in esophageal squamous cell carcinoma (ESCC) is unclear. In this study, we found that the expression of RIT1 is downregulated in ESCC compared to corresponding non-tumor tissues. The low-level expression of RIT1 was correlated with poorer prognosis. Then we showed that RIT1 inhibited proliferation, invasion, and migration of  ...[more]

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