TEAD Transcription Factor Family: From Developmental Regulation to Novel Therapeutic Targets in Cancer

Structural Features and Molecular Mechanisms of TEAD Proteins

The TEAD (TEA domain transcription factors) family comprises four highly conserved members (TEAD1-4) that play a central regulatory role in mammalian development and tissue homeostasis. The most distinctive structural feature of these proteins is the highly conserved TEA DNA-binding domain, which specifically recognizes regulatory sequences such as the MCAT element (5'-CATTCC-3'). X-ray crystallography studies have revealed that TEAD proteins adopt a unique "cloverleaf-like" three-dimensional structure, where the N-terminal TEA domain mediates DNA recognition, while the C-terminal transcriptional activation domain (YAP/TAZ-binding domain) facilitates interactions with coactivators. Notably, all TEAD family members require the formation of complexes with coactivators like YAP or TAZ to exert their full transcriptional regulatory functions, a dependency that provides a specific avenue for targeted intervention. At the molecular level, the TEAD-YAP/TAZ complex recruits histone acetyltransferases (e.g., p300) and chromatin remodeling complexes to open tightly packed chromatin and activate downstream target gene expression. Recent studies have also identified various post-translational modifications of TEAD proteins, including palmitoylation, phosphorylation, and ubiquitination, which finely regulate their stability, subcellular localization, and transcriptional activity.

Core Regulatory Role in the Hippo Signaling Pathway

TEAD transcription factors serve as the most downstream effectors of the Hippo signaling pathway, constituting a central hub in its regulatory network. In the canonical Hippo pathway, the upstream kinase cascade (MST1/2 and LATS1/2) inhibits YAP/TAZ nuclear localization through phosphorylation, thereby blocking their binding to TEAD. When the Hippo pathway is inactive, dephosphorylated YAP/TAZ translocate into the nucleus and form a transcriptional activation complex with TEAD, driving the expression of genes associated with cell proliferation and survival. This mechanism plays a critical role in organ size control and regeneration, and its dysregulation is closely linked to the development of various cancers. Recent studies have revealed that TEAD regulation is far more complex than initially thought: beyond the Hippo pathway, mechanical stress, cell polarity, energy status, and GPCR signaling can also influence TEAD activity. For example, extracellular matrix stiffness alters cytoskeletal tension, modulating TAZ nucleocytoplasmic distribution and thereby regulating TEAD-mediated transcriptional programs. Notably, certain cancer-associated mutations can structurally activate TEAD interactions with cofactors, completely bypassing upstream Hippo pathway regulation, offering new insights into tumorigenesis.

Physiological Functions in Embryonic Development and Tissue Homeostasis

TEAD family members exhibit both overlapping and distinct functional patterns during embryonic development. Gene knockout studies have shown that TEAD1 is indispensable for cardiomyocyte differentiation and heart morphogenesis, while TEAD2 plays a critical role in neural tube closure and early embryonic development. TEAD3 is prominent in placental development, and TEAD4 is essential for trophoblast cell lineage determination and embryo implantation. This functional specialization arises from differences in spatiotemporal expression patterns and the ability to recruit specific cofactors. In adult tissues, TEAD proteins are continuously expressed and contribute to maintaining homeostasis and regenerative capacity in various organs. Moderate activation of the TEAD-YAP signaling axis in the liver promotes hepatocyte proliferation and injury repair, whereas excessive activation leads to hepatomegaly or even hepatocellular carcinoma. In skin epithelium, mechanical tension regulates the balance between stem cell proliferation and differentiation via TEAD, maintaining tissue barrier function. Recent studies have also highlighted TEAD's roles in angiogenesis, bone remodeling, and immune regulation, indicating that its biological functions are far broader than initially recognized. Notably, different TEAD family members can compensate for one another in certain tissues, explaining why single-gene knockouts sometimes yield relatively mild phenotypes, whereas multiple knockouts often result in embryonic lethality.

Dual Roles in Cancer Development and Progression

Aberrant activation of TEAD transcription factors has become a hallmark of multiple malignancies, particularly in mesothelioma, hepatocellular carcinoma, and neurofibromatosis. Whole-genome analyses reveal that approximately 60% of human cancers exhibit genetic alterations in Hippo pathway components, ultimately leading to hyperactivation of the TEAD-YAP/TAZ signaling axis. TEAD-driven oncogenic transcriptional programs include promoting cell cycle progression (via upregulation of MYC, CCND1, etc.), inhibiting apoptosis (upregulating BCL2L1), maintaining stem cell properties (upregulating SOX9), and remodeling the tumor microenvironment (inducing stromal factors like CTGF and CYR61). Clinicopathological studies have shown that high TEAD4 expression is significantly associated with aggressive progression and poor prognosis in gastric, breast, and colorectal cancers. Interestingly, however, TEAD may also exert tumor-suppressive effects in specific contexts. For instance, TEAD1 has been found to inhibit androgen receptor signaling in prostate cancer, while TEAD3 suppresses tumor invasion in gliomas by regulating specific miRNA clusters. This duality underscores the tissue-specific functional differences of TEAD and presents challenges for designing targeted therapies.

Strategies and Challenges in TEAD-Targeted Therapy

Significant progress has been made in TEAD-targeted therapeutic strategies, primarily focusing on three approaches: direct inhibition of TEAD activity, disruption of TEAD-YAP/TAZ interactions, and interference with TEAD palmitoylation. The most established strategy involves developing small-molecule compounds that competitively bind to TEAD's palmitoylation pocket, such as VT103 and VT104, which have entered clinical trials. These compounds mimic natural palmitate binding to TEAD, inducing conformational changes that inhibit its transcriptional activity. Another promising approach involves designing peptide or small-molecule inhibitors to block TEAD-YAP/TAZ protein-protein interactions, such as the recently reported super-TDU peptide. Additionally, PROTAC technology has been employed to design TEAD-targeted degraders that selectively eliminate TEAD proteins via the ubiquitin-proteasome system. However, these strategies face major challenges: the high homology among TEAD family members makes subtype-selective inhibitor development exceptionally difficult; TEAD's physiological functions in normal tissues raise toxicity concerns; and acquired resistance mechanisms, such as YAP/TAZ overexpression or TEAD mutations, are emerging. To address these issues, next-generation drug design is exploring allosteric inhibitors and bifunctional molecules, alongside biomarker-guided patient stratification strategies.

Future Research Directions and Clinical Translation Prospects

The TEAD research field is advancing toward greater precision and depth, with several breakthroughs anticipated. Single-cell multi-omics technologies will help decipher cell-specific regulatory networks of TEAD activity in different tissues, informing the development of tissue-selective drugs. Advances in gene editing and epigenetic regulation enable precise correction of oncogenic TEAD signaling, as demonstrated by CRISPR-based strategies to modify YAP/TAZ-TEAD interaction interfaces in preclinical models. In drug delivery, nanocarriers and antibody-drug conjugate (ADC) technologies may enhance tumor targeting of TEAD inhibitors while reducing systemic toxicity. Clinically, over a dozen TEAD- or Hippo pathway-targeting drugs are in various stages of development, with TEAD palmitoylation inhibitors for malignant mesothelioma and NF2-deficient tumors progressing most rapidly (now in Phase II trials). Another key direction involves exploring combination strategies with conventional therapies (e.g., immune checkpoint inhibitors), as preliminary data suggest that inhibiting the YAP/TAZ-TEAD axis can remodel the tumor immune microenvironment and enhance PD-1 antibody efficacy. With these advancements, TEAD-targeted therapies are poised to become a vital treatment option for specific cancer subtypes within the next 5–10 years, adding a powerful tool to precision oncology.

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