KMID : 0620920210530061055
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Experimental & Molecular Medicine 2021 Volume.53 No. 6 p.1055 ~ p.1067
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YAP inactivation in estrogen receptor alpha-positive hepatocellular carcinoma with less aggressive behavior
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Jeon Young-Sic
Yoo Jeong-Eun Rhee Hyung-Jin Kim Young-Joo Kim Gwang-Il Chung Taek Yoon Sa-Rah Shin Bo-Ram Woo Hyun-Goo Park Young-Nyun
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Abstract
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The expression of estrogen receptor alpha (ER¥á, encoded by ESR1) has been shown to be associated with the prognostic outcomes of patients in various cancers; however, its prognostic and mechanistic significance in hepatocellular carcinoma (HCC) remain unclear. Here, we evaluated the expression of ER¥á and its association with clinicopathological features in 339 HCC patients. ER¥á was expressed in 9.4% (32/339) of HCCs and was related to better overall survival (OS; hazard ratio [HR]?=?0.11, p?=?0.009, 95% C.I.?=?0.016?0.82) and disease-free survival (DFS, HR?=?0.4, p?=?0.013, 95% C.I.?=?0.18?0.85). ER¥á expression was also associated with features related to more favorable prognosis, such as older age, lower serum alpha-fetoprotein level, and less microvascular invasion (p?0.05). In addition, to obtain mechanistic insights into the role of ER¥á in HCC progression, we performed integrative transcriptome data analyses, which revealed that yes-associated protein (YAP) pathway was significantly suppressed in ESR1-expressing HCCs. By performing cell culture experiments, we validated that ER¥á expression enhanced YAP phosphorylation, attenuating its nuclear translocation, which in turn suppressed the downstream signaling pathways and cancer cell growth. In conclusion, we suggest that ER¥á expression is an indicator of more favorable prognosis in HCC and that this effect is mediated by inactivation of YAP signaling. Our results provide new clinical and pathobiological insights into ER¥á and YAP signaling in HCC.
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KEYWORD
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Gene ontology, Liver cancer, Prognostic markers
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