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Pin1 facilitates NF-?B activation and promotes tumour progression in human hepatocellular carcinoma.

ABSTRACT: NF-?B promotes HCC progression; however, therapies targeting NF-?B are not used due to severe adverse reactions. Pin1 is reported to induce tumour progression in vitro. However, the role of Pin1 in HCC is unclear. Moreover, little is known about the mechanism of Pin1-mediated NF-?B activation.Fresh surgical specimens were collected from 144 HCC patients. Pin1 and NF-?B-p65 expression was evaluated by immunohistochemistry and western blotting. NF-?B activation was assessed by EMSA.Pin1 was increased in HCC compared to adjacent liver tissue. The multivariate analysis revealed that high Pin1 expression was an independent factor for poor prognosis. In HCC with high Pin1 expression, tumour size was larger and portal vein invasion was increased. Pin1 expression was correlated with phosphorylated (p-) NF-?B-p65(Thr254) and p-NF-?B-p65(Ser276), and thereby NF-?B activation. Pin1-induced NF-?B activation accelerated cell cycle progression, induced angiogenesis, and inhibited apoptosis. Pin1 knockdown in HCC cells inhibited the phosphorylation of NF-?B-p65(Ser276), and reduced NF-?B activation, which resulted in inhibiting tumour cell progression. When HCC cells were treated with the Pin1 inhibitors, p-NF-?B-p65(Ser276) expression and NF-?B activation was reduced, and cell proliferation was inhibited.Pin1 is associated with aggressive tumour progression and poor prognosis in HCC by mediating NF-?B activation.

SUBMITTER: Shinoda K

PROVIDER: S-EPMC4815797 | biostudies-other | 2015 Nov

REPOSITORIES: biostudies-other

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Pin1 facilitates NF-κB activation and promotes tumour progression in human hepatocellular carcinoma.

Shinoda Kimio K Kuboki Satoshi S Shimizu Hiroaki H Ohtsuka Masayuki M Kato Atsushi A Yoshitomi Hideyuki H Furukawa Katsunori K Miyazaki Masaru M

British journal of cancer 20151013 9

<h4>Background</h4>NF-κB promotes HCC progression; however, therapies targeting NF-κB are not used due to severe adverse reactions. Pin1 is reported to induce tumour progression in vitro. However, the role of Pin1 in HCC is unclear. Moreover, little is known about the mechanism of Pin1-mediated NF-κB activation.<h4>Methods</h4>Fresh surgical specimens were collected from 144 HCC patients. Pin1 and NF-κB-p65 expression was evaluated by immunohistochemistry and western blotting. NF-κB activation w ...[more]

PMID: 26461058

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Project description:Background:Hepatocellular carcinoma (HCC) is still the most common cause of cancer-related mortality worldwide and accumulating studies report that HCC is frequently linked to chronic inflammation. G-protein alpha-subunit (GNAS)-activating mutations have recently been reported to form a rare subgroup of inflammatory liver tumors. In this study, we investigated the roles of GNAS in inflammation-related HCC progression and its underlying mechanism. Methods:Lipopolysaccharides (LPS) and diethylnitrosamine were employed to stimulate HCC cells to an induced inflammatory response. qRT-PCR, immunohistochemistry and immunoblotting were performed to detect the expression of GNAS in HCC tissues and cell lines. Expression levels of proinflammatory cytokines were detected by qRT-PCR and ELISA. N6-methyladenosine (m6A) methylation of GNAS mRNA was detected by RNA-binding protein immunoprecipitation (RIP). Transcription factors activation profiling plate array was performed to investigate the underlying mechanism in GNAS promoting interleukin-6 (IL-6) expression in HCC cells. HCC cell invasion was determined by transwell assay in vitro, and tumorigenesis was assessed with a subcutaneous xenograft mouse model of HCC. Results:We found that LPS stimulation promotes GNAS expression in HCC cells through increasing m6A methylation of GNAS mRNA. The high expression level of GNAS promotes LPS-induced HCC cell growth and invasion by interacting with signal transducer and activator of transcription 3 (STAT3). Furthermore, GNAS knockdown inhibits LPS induced-IL-6 expression in HCC cells by suppressing STAT3 activation. Moreover, we found that GNAS promotes LPS-induced STAT3 activation in HCC cells through inhibiting long non-coding RNA TPTEP1 interacting with STAT3. In addition, GNAS expression promotes HCC development in mice and is related to poor survival. Conclusions:Our findings for the first time indicate a tumor-promoting role of GNAS in inflammation-related HCC progression and provide a novel potential target for HCC therapy.

Project description:Olfactomedin 4 (OLFM4) induces signal transducer and activator of transcription 3 (STAT3) activation by inhibiting gene associated with retinoid-interferon-induced mortality 19 (GRIM19), a strong STAT3 suppressor gene; however, the mechanisms of OLFM4 for regulating GRIM19-STAT3 cascade in hepatocellular carcinoma (HCC) remain unclear. The functions and regulations of OLFM4, GRIM19, and STAT3 activation in HCC progression were evaluated using surgical specimens collected from 111 HCC patients or 2 HCC cell lines in vitro. Moreover, the cancer stem cell-like property of OLFM4 mediated by leucine-rich repeat-containing G protein-coupled receptor 5 (LGR5), known as an intestinal stem cell marker, was investigated. OLFM4 was increased in HCC compared with adjacent liver tissue. The multivariate analysis revealed that high OLFM4 expression was an independent factor for poor prognosis. OLFM4 expression was negatively correlated with GRIM19 expression and positively correlated with STAT3 activation in HCC, thereby increasing cell cycle progression. OLFM4 knockdown in HCC cells increased GRIM19 expression and inhibited STAT3 activation; however, after double knockdown of GRIM19 and OLFM4, STAT3 activation decreased by OLFM4 knockdown was increased again. OLFM4 knockdown increased cell apoptosis, inhibited cell proliferation, and suppressed cancer stem cell-like property in HCC cells. The incidence of hematogenous recurrence was higher in HCC patients with high OLFM4 expression, suggesting that anoikis resistance of HCC was enhanced by OLFM4. In clinical cases, LGR5 expression and CD133 expression was correlated with OLFM4 expression in HCC, leading to poor patient prognosis. In vitro, LGR5 enhanced cancer stem cell-like property by up-regulating OLFM4 through the Wnt signaling pathway. Conclusion: OLFM4 is induced by the LGR5-Wnt signaling pathway and is strongly associated with aggressive tumor progression and poor prognosis in HCC by regulating STAT3-induced tumor cell proliferation and cancer stem cell-like property. Therefore, OLFM4 is a novel prognostic predictor and a potential therapeutic target for patients with HCC.

Dataset Information

Pin1 facilitates NF-?B activation and promotes tumour progression in human hepatocellular carcinoma.

Publications

Pin1 facilitates NF-κB activation and promotes tumour progression in human hepatocellular carcinoma.

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