New Insights into the Roles of the Hippo Signaling Pathway in Stem Cell Biology

Amirhossein Naghsh Nilchi; Fariba Dehghanian; Sheyda Khalilian; Seyedeh Zahra Hosseini Imani

doi:10.5812/jjcmb-136938

New Insights into the Roles of the Hippo Signaling Pathway in Stem Cell Biology

authors:

Amirhossein Naghsh Nilchi ¹ , Fariba Dehghanian ^{1
, *} , Sheyda Khalilian ¹ , Seyedeh Zahra Hosseini Imani ¹

1 Department of Cell and Molecular Biology and Microbiology, Faculty of Biological Science and Technology, University of Isfahan, Isfahan, Iran

Jentashapir Journal of Cellular and Molecular Biology: Vol.14, issue 3; e136938

published online: September 29, 2023

article type: Review Article

received: August 2, 2023

accepted: September 20, 2023

DOI: https://doi.org/10.5812/jjcmb-136938

how to cite: Naghsh Nilchi A, Dehghanian F, Khalilian S, Hosseini Imani S Z. New Insights into the Roles of the Hippo Signaling Pathway in Stem Cell Biology. Jentashapir J Cell Mol Biol. 2023;14(3):e136938. https://doi.org/10.5812/jjcmb-136938.

Abstract

A highly conserved kinase cascade, including mammalian STE20-like protein kinases (MSTs), large tumor suppressors (LATSs), and downstream transcription coactivators containing YES-associated protein (YAP) and transcriptional coactivator with PDZ-binding motif (TAZ) are involved in the Hippo signaling pathway. As two critical transcriptional coactivators, TAZ and YAP are adversely regulated by the Hippo signaling pathway. They lead to the induction of organ regeneration and the expression of cell growth and division-promoting genes through binding to transcription factors, especially TEA domain transcription factors (TEADs). Previous studies highlight the role of the Hippo pathway in organ size control, homeostasis, cell proliferation, and tumor development. Research has shown this pathway's vital role in cancer stem cell biology, including self-renewal and drug resistance. Improper activation of YAP and TAZ through the Hippo pathway dysregulation or its increased expression can accelerate tumorigenesis. Thus, pharmacological inhibition of YAP and TAZ is suggested as a promising approach in the treatment of tumors with high YAP/TAZ activity.

Keywords

Hippo Pathway Stem Cells Cancer YAP/TAZ

1. Context

The Hippo signaling pathway (HSP), a conserved signaling pathway through evolution, plays critical roles in controlling organ size, tissue regeneration, and tumor suppression (1, 2). The YES-associated protein (YAP) and transcriptional coactivator with PDZ-binding motif (TAZ) are involved in HSP as transcriptional coactivators (3). Upon activation, YAP and TAZ initiate a transcriptional program promoting cell proliferation and enhancing stem cell self-renewal, which are essential for tissue regeneration stimulation. However, aberrant-activated YAP and TAZ can lead to malignant tumor formation (4). Here, we review the updates of the HSP in stem cell biology and its potential therapeutic targets.

2. Hippo Signaling Pathway

The HSP contains a highly conserved cascade of serine/threonine kinases, which negatively regulate the YAP and TAZ expression and activity. In mammals, the core members involved in the pathway include mammalian STE20-like protein kinase 1 (MST1) and MST2 and large tumor suppressor 1 (LATS1) and LATS2 (5, 6). These kinases' activity also depends on their interactions with different scaffolding proteins. Salvador homolog 1 (SAV1) forms complexes with MST1/2, while MOB kinase activator 1A (MOB1A) and MOB1B interact with LATS1/2 (7-9). After the HSP activation, MST1/2 phosphorylates and activates LATS1/2 and MOB1A/1B (10, 11). Then, the YAP and TAZ HXRXXS motifs are directly phosphorylated by LATS1/2 (12). Two main phosphorylation mechanisms inhibit YAP and TAZ activity. First, a binding site for 14-3-3 is created by phosphorylating YAP (on serine 127) and TAZ (on serine 89). The 14-3-3 complex promotes YAP and TAZ sequestration in the cytoplasm (13, 14). In the second mechanism, YAP serine 381 and TAZ serine 311 are phosphorylated, promoting casein kinase-1 mediated phosphorylation. The extra phosphorylation induces a motif targeted by β-transducin repeat-containing protein (β-TrCP), which results in YAP and TAZ degradation (15). In the nucleus, the accumulated YAP and TAZ promote the expression of specific genes when the HSP is deactivated (Figure 1). There is no DNA-binding domain in YAP and TAZ. They regulate the expression of the target genes by forming complexes with other transcription factors. In mammals, YAP and TAZ frequently bind to TEA domain transcription factors (TEAD1 to TEAD4). Studies reported interactions between other transcription factors, including p73, T-box transcription factor 5 (TBX5), and RUNT-related transcription factor 1 (RUNX1), RUNX2 with YAP/TAZ (16).

Figure 1.

Hippo signaling pathway. The schematic diagram for the Hippo pathway's core components and signal transduction. A, when Hippo signaling is on (in high cell density), unknown upstream signaling leads to the activation of mammalian STE20-like protein kinase 1 (MST1)/2. Activated MST1/2 phosphorylate Salvador homolog 1 (SAV1), which, in turn, phosphorylates large tumor suppressor (LATS) and MOB kinase activator 1 (MOB1). The activated LATS/MOB phosphorylates YES-associated protein (YAP)/transcriptional coactivator with PDZ-binding motif (TAZ), resulting in cytoplasmic retention by the 14-3-3 protein and proteasomal degradation of YAP/TAZ; B, when Hippo signaling is off (in low cell density), the kinases MST1/2 and LATS are inactive, which inhibits the phosphorylation of YAP and TAZ. The stabilized YAP/TAZ in nuclei interacts with TEA domain transcription factor (TEAD) and enhances the transcription of target genes related to anti-apoptosis and proliferation.

Recent evidence reported that the extracellular matrix and neighboring cells regulate YAP/TAZ through mechanical cues (17-19). Moreover, it was indicated that various extracellular hormones, including epinephrine, glucagon, lysophosphatidic acid (LPA), and thrombin, potently regulate the HSP (17, 20). It seems that the actin cytoskeleton mediates these mechanical and hormonal cues. Mechanically, F-actin stability results in YAP/TAZ activation, whereas F-actin disruption results in YAP/TAZ deactivation (21, 22). The transduction of extracellular hormonal cues through the actin cytoskeleton and RHO GTPases by G-protein-coupled receptors (GPCRs) modulates YAP/TAZ. The YAP/TAZ activity is simulated or inhibited by GPCR signaling. For example, YAP/TAZ is stimulated by G12/13 or Gq/11 activation and inhibited by Gs (20, 23, 24). Many other extra proteins have been reported to regulate the HSP beyond the main members of the HSP described above, including thousand-and-one amino acid protein kinases (TAOK1-3) (25), MAP/microtubule affinity-regulating kinases (MARK1-4) (26, 27), salt-inducible kinases (SIK1-3) (28), RAS association domain-containing family protein (RASSF) (29), multiple ankyrin repeats single KH domain-containing protein (MASK) (30), and homeodomain-interacting protein kinase 2 (HIPK2) (31).

3. Hippo Signaling Pathway in Embryogenesis and Embryonic Stem Cells

The HSP is the critical pathway that limits tissue and organ growth (4). Human embryonic stem cells (hESCs) are characterized by their capacity to self-renew and maintain pluripotency in the culture and are derived from the inner cell mass of the blastocyst. The first cell fate specification occurs during development between the morula and blastocyst stages, before the embryo's implantation into the uterus (preimplantation). The morula's outer cells get apicobasal polarity and differentiate into a cyst-like epithelial tissue in the blastocyst known as trophectoderm (TE). The TE is necessary for implantation and builds the placental tissues afterward. The inner cell mass (ICM), a collection of cells adhering to one side of the TE, comprises the nonpolar inner cells. The embryo proper and various extraembryonic tissues are produced by the ICM (32, 33). The specification of TE and ICM cell fates is regulated by the HSP. In the outer cells, it is dormant, allowing YAP to build up in the nucleus. When TEAD4 and nuclear YAP bind together, TEAD4 becomes a transcriptional activator. Cdx2 and Gata3 are transcription factors specific to TEs activated by the TEAD4-YAP complex, driving TE development (34-37). Hippo signaling pathway is active in the inner cells, which prevents YAP from building up in the nucleus. Through TEAD4 inactivation, nuclear YAP deficiency limits the production of transcription factors unique to TE (38). This permits the high-level production of the transcription factors Oct3/4, Nanog, and Sox2, which encourage the differentiation of cells into the ICM and are likely auto-activation mechanisms (32) (Figure 2).

Figure 2.

Differential Hippo signaling specifies distinct cell fates in the preimplantation embryo cell. The inner cells activate Hippo signaling, allowing the inner cells to express inner cell mass (ICM)-specific transcription factors and adopt the ICM fate. Hippo signaling is suppressed in the outer cells, promoting the differentiation of outer cells to trophectoderm (TE).

Recent research on YAP and TAZ has revealed that transcriptional coactivators control embryonic stem cell (ESC) self-renewal and differentiation (39). A study relating HSP to ESC biology found that TAZ controls the location of transcriptional regulators SMAD2/3-4, which mediate tissue growth factor (TGF)-signaling. Transcriptional coactivator with PDZ-binding motif binds SMAD2/3-4 proteins to encourage nuclear agglomeration and coupling to the mediator complex, enhancing their transcriptional activity after TGF stimulation. According to two studies published more recently, YAP is inactivated during (mouse) mESC development, and YAP or TEAD knock-down results in loss of pluripotency (40, 41). On the other hand, when it is ectopically overexpressed in induced pluripotent stem cells (iPSCs), activated YAP improves reprogramming effectiveness and prevents differentiation in mESCs (40). These investigations also discovered that YAP-TEAD stimulates the transcription of recognized stemness genes in mESCs but not mature cells, including Oct3/4, Sox2, Nanog, BMP signaling, and LIF targets. These results are consistent with the hypothesis that YAP/TAZ mediates BMP/TGF transcriptional activity and directly increases the expression of essential stemness genes to maintain ESC pluripotency in vitro (42, 43).

4. Hippo Signaling and Somatic Stem Cells

4.1. Liver Progenitor Cells

The HSP has a crucial role in different somatic stem cells. The most significant metabolic organ, the liver, has an important capability for regeneration. Even a 70% hepatectomy can lead to regeneration. Hepatocytes, the primary cell type in the adult liver, do not undergo mitosis. The liver has oval cells (OCs) that can produce a transit precursor compartment, but hepatocyte proliferation is necessary for the liver to regenerate. Although liver regeneration has long been understood, the underlying mechanisms and the method by which the liver determines when it has grown back to its original size are still unknown (44, 45).

Historic studies verified the HSP's physiological significance in mammalian liver using mouse models that conditionally overexpress YAP in hepatocytes (46). The postnatal liver underwent significant but reversible liver hyperplasia due to YAP activation, which resulted in a four-fold increase in the total mass of the organ. The primary cellular factor in hyperplasia was the excessive proliferation of mature hepatocytes. These results provide evidence that a human homolog of the Drosophila HSP can affect tissue size and provide the foundation for further research along this line. Other HSP elements have recently been postulated to inhibit liver development (42). After Mst1/2 deletion, mice developed liver tumors that exhibited traits of both cholangiocarcinoma (CC) and hepatocellular carcinoma (HCC), proving that these tumors originated from bipotential liver progenitor cells (47, 48). Cell lines generated from MST1/2 null livers experienced growth inhibition and extensive apoptosis upon YAP depletion (49, 50). These findings support the theory that the primary cause of liver enlargement associated with MST1/2 deficiency is YAP activation. These results suggest that HSP components may significantly regulate organ size and hepatocyte quiescence in animals. However, their dysregulation can result in stem cell proliferation, enlargement, and cancer via several mechanisms. The phenotypes observed in mice models with conditional deletion of various HSP components differ. Consequently, more research is required to thoroughly understand the functions of these HSP components in the regulation of liver progenitor cells, as well as their modes of action.

4.2. Neural Progenitor Cells

Neural progenitor cells are distributed throughout the ventricular zone of the neural tube in developing vertebrates. They produce several cell types that constitute the mature central nervous system (CNS) (51, 52). The YAP protein colocalizes with Sox2 and is expressed in mouse, frog, and chick neural tube progenitor zones (53). A significant increase in neural progenitors is caused by Mst1/2 or Lats1/2 loss, or YAP-TEAD activation, partly due to the overexpression of cell cycle re-entry and stemness genes and a barrier to differentiation by inhibiting critical genes. On the other hand, YAP deficiency increases cell death and premature neuronal differentiation (42, 54). In the perivascular niche of the cerebellum, endogenous YAP is present in high concentrations in cerebellar granule neural precursors (CGNPs) and tumor-repopulating cancer SCs (55, 56). High levels of YAP are also expressed in this area of the brain by an increase in cells with an undifferentiated CGNP phenotype, such as medulloblastomas, which are common in children (57, 58). Since the sonic hedgehog (Shh) pathway is activated in human medulloblastomas and CGNPs depend on Shh signaling to proliferate, the relationship between the Hippo and Shh pathways was investigated (59, 60). Shh signaling in CGNPs causes the expression and nuclear localization of YAP, and YAP then encourages the development of these cells. Recent research points to a new model of the brain in which YAP acts as a nexus between neural stem cell (NSC) proliferative pathways, including Notch and Shh (and maybe others), which were previously believed to cooperate to regulate brain development, to enhance NSC proliferation (61).

4.3. Skin Stem Cells

Animals' largest organ, the skin, is a barrier against environmental dangers and maintains the body's moisture. The self-renewal ability of epidermal SCs (eSCs) at the basal layer allows the skin to regenerate and continuously maintain its structural and functional integrity. Short-lived progenitor cells that stratify leave the basal layer and ascend upward via the suprabasal layers to the organ's surface are the product of asymmetric divisions in this SC compartment during terminal development (60, 62). In recent investigations, the significance of YAP in epidermal development and SC homeostasis has been emphasized (62-64). Two research groups demonstrated that YAP activation significantly thickens the epidermal layer using a mouse model with skin-inducible YAP expression. Surprisingly, this hyperplasia is fueled by the expansion of undifferentiated interfollicular stem and progenitor cells (65). Colony-formation tests showed that larger cells exhibited higher levels of clonogenic activity and a longer self-renewal period. However, skin-specific YAP deletion or genetic ablation of the YAP-TEAD interaction during epidermal development resulted in epidermal hypoplasia and failure of skin growth (65). Unexpectedly, a genetic investigation found that the classical Hippo kinases do not control the skin's YAP. A downstream negative regulator of YAP was shown to be -catenin, a part of adherens junctions (AJs). Based on the massive overgrowth symptoms produced by -catenin loss in the developing brain and skin, it was hypothesized that AJs could function as molecular biosensors of cell density and position (66, 67). This notion is confirmed and expanded upon by genetic and functional findings relating to YAP and -catenin, suggesting that YAP is a significant mediator of density regulation in the epidermis. In this paradigm, increased cellular density prevents SC expansion by inactivating YAP. When this molecular network is disturbed, hyperproliferation and cancer might develop.

4.4. Cancer Stem Cells

The HSP is crucial in controlling organ size and carcinogenesis by inhibiting cell proliferation, inducing apoptosis, and controlling the growth of stem/progenitor cells (57, 58, 68). The nucleus contains unphosphorylated YAP/TAZ, encouraging tumor and cell proliferation. The cytoplasm is the central location of phosphorylated YAP/TAZ, which prevents tumor growth. Numerous malignant cancers are associated with elevated YAP/TAZ expression and activity (69-71). Breast cancer stem cells (CSCs) have also been discovered to be significantly regulated by TAZ (72). Additionally, highly expressed in medulloblastoma CSCs are YAP and TEAD (73). CSCs, a tiny subset of tumor cells that can self-renew, differentiate into different tumor cell types, and cause tumor growth, have recently been associated with tumor development. It is believed that CSCs resistant to chemotherapeutic agents are to blame for cancer spread and recurrence. Numerous human malignancies, including liver, lung, colorectal, ovarian, and prostate cancers, have been linked to HSP dysregulation (74-78). Studies have shown that higher expression and nuclear localization of YAP results in enhanced activity in human tumor tissues. This is in line with the inhibition of the HSP, which is known to restrict the function of YAP and TAZ by encouraging their cytoplasm localization and eventual degradation by ubiquitin. In numerous mouse and human tumor models, the YAP gene has also been found to be amplified (58, 79-81). These results suggest that unchecked YAP activation can circumvent conventional tumor suppressor checkpoints. Compared to other well-known carcinogenic signaling pathways, the direct mutation of an HSP component has only occasionally been associated with malignancies (4). According to numerous investigations, the HSP is crucial in human cancer. Inhibiting YAP/TAZ could be a potential treatment strategy for malignancies with imbalanced HSP. According to a recent study, HSP controls the YAP and TAZ transcriptional networks in mammalian systems. YAP1/TAZ transcriptional output downregulation revealed that prostate-derived ETS factor (PDEF), a tumor metastasis suppressor, positively regulates HSP. These results might provide a fresh avenue for treating prostate cancer (Figure 3) (8, 82).

Figure 3.

Role of the Hippo signaling pathway in somatic stem cells

5. Drug Resistance

The most prevalent cancer treatments at present are chemotherapy and targeted therapy. Sadly, traditional treatments frequently fail to eradicate cancer cells that develop into CSCs, allowing for clinical recurrence caused by CSCs. Chemotherapeutic resistance is present in tumor cells with increased YAP/TAZ activity, partly due to the CSC characteristics brought on by YAP/TAZ activation. Prostate epithelial cells are transformed in vivo by YAP activation into androgen-insensitive cells with castration resistance (83). Recent research has revealed that miR-302/367-mediated LATS2 inhibition causes YAP activation and confers CSC status in prostate cancer cells (84). Metastatic activity and drug resistance to chemotherapeutic drugs, such as paclitaxel and doxorubicin, have been linked to YAP/TAZ activation in breast CSCs (72, 85). Numerous studies have shown that blocking the HSP or activating YAP/TAZ in various tumor types increases cancer cell survival against DNA-damaging medicines, including cisplatin, taxol, and fluorouracil (5-FU) (86-88). Additionally, YAP/TAZ promotes resistance to targeted therapy. A severe clinical issue is that YAP increases treatment resistance to agents that target RAF and MEK in tumor cells with BRAF, KRAS, or NRAS mutations (89). Actin remodeling is one way YAP becomes resistant to BRAF inhibitors in melanoma cells (90). Importantly, the YAP/TAZ-TEAD target genes of the secreted ligands play a role in drug resistance. Connective tissue growth factor (CTGF) promotes chemotherapeutic drug resistance in glioblastoma multiforme (GBM), breast cancer, and osteosarcoma (91). These results imply that non-cell autonomous processes may target YAP/TAZ-induced secreted ligands more effectively.

6. Pharmacological Interventions

A leading cause of death worldwide is cancer. Cancer stem cells that have undergone EMT can metastasize and pass on drug resistance. The Hippo-YAP/TAZ pathway has become a potent oncogenic driver in cancer cells with CSC characteristics. For small-molecule treatments, protein kinases, which function as oncogenes, are an excellent target. Sadly, because MST1/2 and LATS1/2 (the Hippo core kinases) are tumor suppressors, researchers have been seeking other therapeutic modalities (Figure 4). The most significant inhibitors of the Hippo-YAP/TAZ pathway are covered below.

Figure 4.

Therapeutic targeting of the Hippo pathway. This figure shows the targeting strategies of YES-associated protein (YAP)/transcriptional coactivator with PDZ-binding motif (TAZ) activity in the Hippo pathway. Dasatinib, ROCK inhibitors, and statins represent substances that inhibit the activity of YAP/TAZ by activating large tumor suppressor (LATS). Rapamycin and metformin inhibit LATS-independent YAP/TAZ activity. Verteporfins represent substances that inhibit the interaction between YAP/TAZ and TEA domain transcription factor (TEAD).

7. Verteporfin

Verteporfin, a US Food and Drug Administration (FDA)-approved photosensitizer for macular degeneration, is the most often utilized YAP inhibitor in research institutions (92, 93). It reduces YAP-TEAD-induced target gene transcription by blocking YAP-TEAD binding or increasing 14-3-3 expression (94). Verteporfin suppresses YAP-induced liver carcinogenesis and uveal melanoma in living organisms, pointing to the therapeutic benefit of cutting off the YAP/TAZ-TEAD linkages in cancer cells (67, 95). It works against tumors by directly attaching to YAP. It also has a cytotoxic effect independent of YAP, suggesting that its impact on YAP activity should be examined cautiously (96).

8. Statins

Through FDA-approved drug library screening for drugs that result in YAP/TAZ cytoplasmic translocation in breast cancer cells, statins were found to be potent YAP inhibitors (97, 98). By blocking 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase, statins help people with hypercholesterolemia lower their cholesterol levels. Geranylgeranyl pyrophosphate synthesis, vital for appropriate Rho GTPase activity, is decreased when the HMG-CoA to mevalonate conversion is inhibited. Therefore, statin medication inhibits Rho GTPases, which reduces YAP/TAZ (97, 99).

9. LATS Kinase Inhibitors

In mouse models and human cell lines, the knocking-out of NF2, Sav1, MST1/2, and Mob1 causes cancer development, demonstrating the tumor-suppressive function of the Hippo core kinases (1). Due to the lack of small-molecule kinase activators, Hippo kinases are still challenging to target. The LATS1/2 kinase, however, was recently found to serve an unexpected role in obstructing anti-tumor immunity (100). By inhibiting type I interferon response mediated by the toll-like receptors-MYD88/TRIF pathway, LATS1/2 lowers the antitumor immune response. Inhibition of upstream Hippo kinases, either alone or in combination with immune checkpoint drugs, maybe a potential strategy for suppressing tumor growth. Drugs that target the HSP may aid in tissue regeneration and wound repair in addition to having anticancer properties.

10. Conclusions

Although most HSP components were initially identified in Drosophila, recent human and animal model studies have demonstrated the pathway's crucial function in stem cell development, cancer genesis, and tissue homeostasis. As essential downstream effectors of the HSP, YAP/TAZ is involved in embryonic stem cells, tissue-specific stem cell self-renewal, tissue regeneration, and homeostasis in the liver, colon, pancreas, heart, skin, and CNS. There is also strong evidence that YAP/TAZ contributes to developing cancer stem cell traits. Therefore, elements of the HSP might be promising therapeutic targets for diseases such as cancer and degeneration. Oncogenic driver mutations in the main parts of the HSP are infrequent despite their significance in cancer development. Finding the CSC-specific YAP/TAZ oncogenic signaling network will, therefore, open up new avenues for eliminating CSCs and treating cancer progression.

Footnotes

Authors' Contribution: FD: Drafting the manuscript, writing some parts of the manuscript, and critical revision for important intellectual content; AN: Writing some parts of the manuscript, figure organization, and revision; SK: Writing some parts of the manuscript; SZH: Writing some parts of the manuscript and figure organization.
Conflict of Interests: The authors have no conflict of interest.
Funding/Support: No funding was received.

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