Gene silencing of Tead3 abrogates radiation-induced adaptive response in cultured mouse limb bud cells

Transcription enhanced associate domain factor 1 (TEAD1) predicts liver regeneration outcome of ALPPS-treated patients

BACKGROUND

The two-stage surgical technique of associated liver partition and portal vein ligation for staged hepatectomy (ALPPS) enables extensive liver resection and promotes future liver remnant regeneration (FLR), in part by inhibiting the Hippo signalling pathway. Its main effector, Yes-associated protein (YAP), has low intrinsic transcriptional activity and requires the transcription enhanced associated domain factor (TEAD) family members as cofactors for target gene transcription. We evaluated the intracellular localization and expression of TEAD1-4, hypothesized to regulate the activity of YAP and, consequently, liver regeneration.

METHODS

The intracellular localization of TEAD1-4 was characterized in tumor-free liver (TFL) tissue samples from 44 ALPPS patients obtained during the two stages of ALPPS surgery. Expression levels were correlated with clinical and pathological data as well as liver regeneration metrics.

RESULTS

TEAD family members are simultaneously expressed in individual hepatocytes and show relations with liver regeneration, clinical outcome and outcome parameters when comparing TFL tissue obtained at different stages of ALPPS surgery. Furthermore, differences in TEAD expression and localization within hepatocytes appeared to be independent of global factors.

CONCLUSION

TEAD1-4 expression correlates with liver regeneration outcomes. Specifically, cytoplasmic and nuclear expression scores of TEAD1 serve as predictive markers for clinical outcomes following ALPPS.

TEAD4 exerts pro-metastatic effects and is negatively regulated by miR6839-3p in lung adenocarcinoma progression

Several studies have shown the tumorigenesis role of transcriptional enhancer associate domain (TEAD) proteins; here, we initially explored expression, function and signalling mechanisms of TEAD4 in lung adenocarcinoma (LAD). Both the mRNA and protein levels of TEAD4 were increased in LAD tissues than those in adjacent nontumourous tissues. Besides, database search indicated a poorer clinical outcome in LAD patients with higher TEAD4 expression, revealing its potential tumour-promoting role. Therefore, we conducted cellular experiments to further investigate its effect on tumour phenotypes. Accordingly, TEAD4 showed little impact on LAD cell cycle, proliferation, or apoptosis. However, silencing TEAD4 remarkably attenuated cell migration and invasion capacities. Consistently, several important epithelial-mesenchymal transition (EMT) markers such as E-cadherin and Slug were consequently altered by silencing TEAD4. Furthermore, we identified a novel TEAD4-targeted microRNA, namely miR6839-3p, and confirmed its function in suppressing TEAD4 expression. Finally, the impact of overexpressing miR6839-3p mimics on LAD progression was validated, which showed a similar pattern with TEAD4 knockdown cells. Taken together, our data not only revealed the significant role of TEAD4 in promoting LAD progression and predicting clinical outcome but also distinguished miR6839-3p mimics as a promising therapeutic direction.

The prognostic impacts of TEA domain (TEAD) transcription factor polymorphisms in Chinese hepatocellular carcinoma patients

TEA domain (TEAD) transcription factors play an important role in hepatocellular carcinoma (HCC) development and progression by regulating the expression of a number of genes. However, the association of their genetic variations with HCC prognosis remains elusive. Seven potentially functional single nucleotide polymorphisms in TEAD1-4 (rs2304733, rs10831923, rs12104362, rs3745305, rs11756089, rs2076173, rs7135838) were genotyped from 331 hepatitis B virus positive HCC patients using the Sequenom MassARRAY iPLEX platform. The TEAD3 rs2076173 C allele and rs11756089 T allele were identified as protective alleles as they were significantly associated with longer median overall survival time (MST). The T allele of rs2076173 was significantly associated with HCC survival independent of age, gender, smoking and drinking status, BCLC stage, and chemotherapy or TACE status (HR = 0.73, 95% CI = 0.56-0.93, P = 0.012). This protective effect was more prominent for patients who were non-drinkers (P for multiplicative interaction = 0.002). Patients had more than one of these protective alleles had significant longer MST of 19.25 months than those had none (MST=12.85 months, adjusted HR = 0.56, 95% CI = 0.33-0.95, P=0.030), especially for those non-drinkers (adjusted HR = 0.48, 95% CI = 0.32-0.74, P = 0.001). These findings suggested that rs2076173 and rs11756089 in TEAD3 gene could serve as genetic markers for favorable survival in the Chinese HCC patients.