β-arrestin1 at the cross-road of endothelin-1 signaling in cancer
© The Author(s). 2016
Received: 5 July 2016
Accepted: 24 July 2016
Published: 29 July 2016
The advent of targeted therapeutics in human cancer has begun to find novel druggable targets and, in this context, the endothelin-1 receptor (ET-1R), namely ETA receptor (ETAR) and ETB receptor, among the GPCR family represents a class of highly druggable molecules in cancer. ET-1R are aberrantly expressed in human malignancies, potentially representing prognostic factors. Their activation by ligand stimulation initiate signaling cascades activating different downstream effectors, allowing precise control over multiple signaling pathways. ET-1R regulates cell proliferation, survival, motility, cytoskeletal changes, angiogenesis, metastasis as well as drug resistance. The molecular events underlying these responses are the activation of transcriptional factors and coactivators, and downstream genes, acting as key players in tumor growth and progression. ET-1R represent crucial cancer targets that have been exploited for ET-1R therapeutics. Importantly, efforts to explore new information of ETAR in cancer have uncovered that their functions are crucially regulated by multifunctional scaffold protein β-arrestins (β-arrs) which orchestrate the multidimensionality of ETAR signaling into highly regulated and distinct signaling complexes, a property that is highly advantageous for tumor signaling. Moreover, the role of β-arr1 in ET-1 signaling in cancer highlights why the pleiotropic effects of ET-1 and its dynamic signaling are more complex than previously recognized. In order to improve therapeutic strategies that interfere with the widespread effects of ET-1R, it is important to consider antagonists able to turn the receptors “off” selectively controlling β-arr1-dependent signaling, highlighting the possibility that targeting ETAR/β-arr1 may display a large therapeutic window in cancer.
The endothelin (ET) family comprises three isoforms of small peptides, ET-1, ET-2 and ET-3, products of different genes . ET-2 and ET-3 differ from ET-1 only in two and six amino acid residues, but are separate gene products, with tissue-specific expression. They are synthesized as precursor proteins of about 200 amino acid residues in size, pre-pro-ETs, and then cleaved by a neutral endopeptidase to form an inactive precursor of about 37–41 amino acids, big ETs. Finally, a family of ET-converting enzymes operates the conversion of big ET to the mature 21 amino acids peptides . The levels of prepro-ET-1 are modulated predominantly at the level of transcription, through the involvement of several transcription factors, including activator protein 1, nuclear factor kappa B (NFkB), forkhead box protein O1 (FOXO1), hypoxia-inducible factor 1α (HIF-1α), and GATA2, although both physical and chemical stimuli contribute to alterations in levels of preproET-1 mRNA in physiologic and pathophysiological conditions [1, 2]. In last years, a host of epigenetic modifications have been discovered that allow for precise tuning of DNA exposure and read-out in ET system regulation, also in cancer. Indeed, in colon cancer, hypermethylation of ET-2 and ET-3 genes results in the epigenetic inactivation of ET-2 and ET-3 mRNA and corresponding protein . Recent data highlighted a role of microRNAs (miRNA) to directly target the 3’UTR of ET-1 mRNA for turnover and subsequently to regulate its expression , and the list of miRNAs that may modulate ET-1 expression in different cancers, including hepatocarcinoma and gastric cancer, is growing [4, 5].
This review is divided into four parts. We first outline how ET-1/ET-1R axis actually underlies many features of cancers; in the second part, we review a large body of works on the specific role of β-arrs in different tumors; in the third part, we detailed the various β-arr-dependent signalings upon ET-1R activation in cancer. Finally, in the fourth part, we delineate the ET-1R cancer therapeutics capable to hamper β-arr-mediated signaling.
Role of endothelin-1 signaling in cancer
Accumulating evidences demonstrated that activation of autocrine or paracrine signalings by ET-1R in cancer are complex regulatory mechanisms, and dysregulation of the ET-1R signaling is crucial for the development and progression of several human cancers [2, 10]. Indeed, ET-1R activation, through a G-protein dependent or β-arr-dependent mechanism, modulates different cancer-associated signaling pathways, including MAPK, NF-kB, β-catenin, PI3K/Akt and Rho GTPase, representing one of the major mediators of cell survival and proliferation, drug resistance, angiogenesis, osteogenesis, immune modulation, invasion and metastasis. Moreover, the complexity of ET-1R-mediated signaling is illustrated by its integrative crosstalk with non-GPCR driven signaling cascades, such as the epidermal growth factor receptor (EGFR), vascular endothelial growth factor receptor (VEGFR-2) or c-Src, creating further opportunities for therapeutic intervention [2, 10] (Fig. 1).
ET-1 is now considered responsible for the proliferation activity of different human cancer cells, acting alone or in cooperation with other tumor-related growth factors, favoring the activation of survival pathways [2, 6, 10]. ET-1-induced tumor promoting activities is also devoted to control migration and invasion, as well as epithelial-to-mesenchymal transition (EMT) and metastatic growth, most likely as consequence of a precise control over multiple signals, ranging from β-catenin signaling, EMT-related factors, integrin signaling as well as gap junction intercellular communication disruption [2, 10]. To invade and colonize targeted tissues, an ET-1R-driven effect involves also upregulation of expression, secretion and activation of several matrix metalloproteinases (MMPs), leading to enhanced pericellular protease activity [2, 10]. More recently, new studies on the interactions of ET-1R-driven pro-invasive pathways have highlighted that the mechanism by which cancer cells migrate through the extracellular matrix (ECM) is related to formation of invadopodia, specialized protrusions of the cell membrane of invasive tumour cells, rich in MMPs, facilitating their movement through the basement membrane and hence promoting tumour intravasation and metastasis [11, 12].
Strictly related to cancer progression and challenge in therapeutics, ET-1R is now recognized critically involved also in drug resistance and in the adaptive changes, like cancer stem cell (CSC) traits that, together with EMT, exacerbate metastatic spread and drug resistance . In this context, in ovarian cancer ETAR overexpression correlates with platinum resistance, EMT marker expression and phenotypic changes consistent with stemness [13–16]. Similarly, high levels of ET-1 are expressed in CSC of colon cancer, thus underling the complex action exerted by ET-1R signaling in affording tumor cells invasive and metastatic properties, EMT, CSC-like phenotype, and drug resistance [2, 10].
Emerging data indicate also that ET-1R is capable of re-educating tumor-host environment, composed of immune cells, fibroblasts, and endothelial cells (EC), as well as growth factors, proangiogenic mediators, cytokines, chemokines, and other components of ECM, to form one that is “permissive”, in which multiple interactions between cancer cells and stroma determine not only tumor growth and metastasis but may also develop protective effects [2, 10]. The most studied and appreciated mechanism of ET-1 signaling in tumor microenvironment regards its involvement to direct angiogenesis and lymphangiogenesis through ETBR expressed on blood and lymphatic EC, and the critical interplay with hypoxia, maintaining constant angiogenic and pro-tumoral responses [2, 17–19]. Other studies demonstrated also integration between ET-1 axis signaling and cancer-associated fibroblasts or mesenchymal stromal cells in the formation of a supportive tumour stroma [2, 17, 18, 20]. An increased understanding of the mechanisms by which cancer cells escape the immune system recognizes now ET-1 axis as capable to mediate complex interactions between immune cells and malignant cells, acting on different subsets of immune effectors and regulatory cells, such as dendritic cells and tumor-associated macrophages [2, 10]. A critical interplay between ET-1 axis and T cell–infiltrated phenotype that might prevent T cell homing to tumor endothelium and hinders tumor immunotherapy has been shown in ovarian cancer and in gliomas [13, 21, 22], indicating that ET-1R has the potential to significantly change the ongoing immune response in the tumour microenvironment. In the bidirectional cross-talk between cancer cells and stromal cells, ET-1 signaling is implicated in a series of sequential and interrelated steps, also involved in chemoprotective signals [2, 23–25]. These findings extent previous findings regarding the role of ET-1 signaling in promoting metastasis [26–29], as recently reviewed [2, 10].
The role of ET-1R in the complexity of the tumor microenvironment interactions, and the importance of cell-cell interactions, led to evaluate its expression as potential biomarker in cancer diagnosis and treatment. Levels of ET-1 are higher in patients with bladder cancers, which are prone to metastasize, correlating with reduced patient survival, thus indicating ET-1 as a biomarker for lung metastasis . Analysis of human ovarian cancer tissues demonstrated that ETAR overexpression is associated with worse survival, in particular in advanced stages and in the subset of platinum resistant cases . However, many other studies need for optimizing the use of ET-1R to identify patients who are likely to respond to a given therapy, as well as for measuring patient response to therapy.
Role of β-arrestin in cancer
Roles of β-arrestins in human cancers
Role in cancer
Chemoresistance, angiogenesis, migration, invasion, metastasis
Cell growth, migration, metastasis, stemness, angiogenesis Poor prognosis
Cell viability and proliferation, chemoresistance, migration, metabolic alteration
Regulator of androgen receptor expression
Acute lymphoblastic leukemia.
Cell growth, stemness
Chronic myeloid leukaemia
Cell growth, stemness
Cell growth, apoptosis, migration, invasion and metastasis
Proliferation and invasion
Cell proliferation, migration and invasion and metastsis
Besides cytoplasmic functions, so far unexpected nuclear activities of β-arr are recently reported . Thus, β-arr1 appears to regulate directly transcription causing nuclear interaction of β-arr1 with selected gene promoters and the recruitment of the histone acetyltransferase p300, thus enhancing local histone acetylation and gene transcription . Following studies identified nuclear β-arr1 as a critical mediator of nicotine-induced human non-small cell lung cancer progression (NSCLC). Indeed, nuclear β-arr1/E2F1 complex on promoters of specific target genes drives proliferation, survival and EMT, as well as stemness [40–42]. Recently, it has been shown that β-arr1 contributes also to endothelial dysfunction promoted by nicotine, by promoting its recruitment to the E-selectin promoter as well as E-selectin expression, thus facilitating adhesion of monocytes to EC and endothelial damage, revealing a novel role for nuclear β-arr1 in the growth and metastasis of NSCLC . Other studies depicted nuclear roles of β-arr1 in regulating the dynamic of gene expression in cancer cells by controlling the recruitment of epigenetic regulators, acting in histone modifications or DNA methylation [44–46]. More recently, it has been shown that nuclear β-arr1 play a critical role in facilitating adaptation of cancer cells to growth in conditions of metabolic alterations, called “pseudohypoxia”. Although it was already demonstrated that nuclear β-arr1 interacts with the primary factor mediating the response to low oxygen tension HIF-1α in breast cancer cells, a first genome wide-map of β-arr1 transcriptome in prostate cancer cells reported binding sites for β-arr1, p300 and HIF-1α on the regulatory regions of HIF-1α target gene promoter under hypoxic or pseudohypoxic conditions [47, 48]. This genomic landscape of β-arr1, revealing a partial overlap between β-arr1 and p300 binding sites, and the presence of non-overlapping sites, indicates that β-arr1 may also modulate transcription independently of p300, and also that exploring more in depth the nuclear function of β-arr1 might add one more layer of specialization of β-arr1 activities. The list of β-arr nuclear functions is growing very fast, and includes also new specific activities [49, 50]. Some of these specializations may also include an indirect way to control transcription, as demonstrated for a direct anti-apoptotic action of β-arr1 activated via β(2)-adrenoreceptors at the core of cell death machinery, in which nuclear β-arr1 facilitating activation of MDM2 and degradation of p53 promotes DNA damage accumulation . On the other hand, the localization of several β-arr binding partners, such as JNK3, NF-kB and MDM2, are also regulated by ability of β-arr2 to retain them in the cytosol, and to change interactions with ubiquitinating and deubiquitinating enzymes, thus controlling crucial factors, such as p53, Wnt/β-catenin and FOXO1 [52, 53].
Using data from the Cancer Genome Atlas (TCGA) portal for β-arr1 expression across various tumor datasets, it has been shown that β-arr1 is amplified in various tumors, especially in high-grade ovarian cancer . Interestingly, in patients with lung adenocarcinoma, the β-arr1 overexpression is an independent prognostic factor for tumor progression and unfavorable overall survival, suggesting a role of β-arr1 as promising biomarker to identify patients with poor prognosis . In agreement with these findings, it has been demonstrated that in lung adenocarcinoma patients, co-expression of nuclear β-arr1 and p65 represents a novel predictor for worse prognosis . Also, the higher expression of β-arr1 is positively correlated with clinical phases of chronic myeloid leukemia patients . Given that the multidimensionality of β-arr confer highly advantageous signals to cancer cells, investigating whether β-arr can represent a prognostic factor will certainly emerge as the next challenge in the future cancer research studies.
Multifunctional role of β-arrestin in ET-1 signaling in cancer
It has been shown that different GPCR signal through parallel pathways or support ligand bias to stimulate or promote different cellular responses, based on the ability of ligands to selectively activate G-protein- or β-arr-dependent signaling pathways. Considerable amount of data have been accumulated showing that β-arr1 plays a major role in tumor-promoting effects of ET-1R signaling in cancer [2, 10]. These studies highlighted the formation of new ET-1R-driven β-arr-mediated multiprotein signaling complexes, known as a “signalosomes,” in which β-arr acts as cytosolic or nuclear scaffold, adaptor, and signal transducer, orchestrating a variety of fine-tuned intracellular signaling pathways than culminate in sequential steps of tumor progression. Recently, new roles for β-arr1 have emerged in ET-1 signaling, sequestering and bringing the right players for actin assembly activities and upstream regulators at the leading edge to drive local invasion and metastasis [11, 56]. Thus, ETAR/β-arr1 signaling represents a novel driver of cytoskeletal organization and Rho GTPase activity supporting cell motility. In ovarian cancer cells, ET-1 through β-arr1 activates RhoA GTPase and, downstream, Rho-associated coiled coil-forming kinase 1 (ROCK1) kinase activity, leading to enhanced cell migration and protrusion formation. Most importantly, it has been revealed that β-arr1 acts as signal-integrating module of Rho GTPase activity for specific formation and maturation of invadopodia, small invasive protrusions of localized protease activity, which are formed in response to signaling events leading to dynamic branched actin assembly at membrane sites and are cellular hotspots for secretion of proteinases degrading ECM. This is accomplished by the direct interaction of β-arr1 with a Rho guanine nucleotide exchange factor (GEF), PDZ-RhoGEF, which activates Rho GTPase proteins by catalyzing the exchange of GDP for GTP. Interestingly, β-arr1/PDZ-RhoGEF interaction mediates ETAR-driven ROCK-cofilin pathway through the control of RhoC activity. This novel interaction is functional to invadopodia formation and activation of key invadopodia proteins, cortactin, cofilin and membrane type I (MT1)-MMP. Collectively, these data unveiled a noncanonical activation of the RhoC/ROCK pathway through the β-arr1/PDZ-RhoGEF complex, establishing ET-1R/β-arr1 axis as a novel regulator of invadopodia protrusions during tumor invasion . These results are in line with previous findings demonstrating the role of β-arr in controlling the cofilin pathway localizing actin to the leading edge of cells to promote invasive protrusions during tumor cell migration [12, 35, 57].
More recently, a novel mechanism of β-arr1 nuclear function in ET-1R signaling involving HIF-1α activity has been described (Fig. 2). In ovarian cancer cells, activation of ETAR, by mimicking hypoxia, induces the nuclear β-arr1/HIF-1α interaction and the recruitment of p300 to hypoxia response elements of gene targets, resulting in enhanced histone acetylation, transcription and thus release of HIF-1α targets, such as ET-1 and VEGF, required for tumor cell invasion and pro-angiogenic effects in ECs . These results highlight the presence of a self-amplifying HIF-1α-mediated transcription of ET-1 sustaining a regulatory circuit involved in invasive and angiogenic behaviours. These findings broaden previous data in prostate and breast cancer [47, 48]. The intriguing role of nuclear β-arr1 was further amplified by other findings revealing a previously unrecognized pathway that depends on β-arr1 to sustain NF-kB signaling in response to ETAR activation . Collectively, these multiple lines of evidence underscore more appealing aspects of β-arr1 as transducer of ET-1 signaling during cancer progression, including cytoskeletal organization.
All these findings suggest that further investigations are required to elucidate the role and regulation of these metastatic promoting functions driven ET-1R signaling, to determine the degree of which is dictated by the G-protein-dependent and β-arr dependent signaling as well as the involvement of β-arr isoforms, that will aid in the identification of new targets for the design of novel therapeutics against cancer. In this regard, in ovarian cancer model it has been clearly depicted the functional selectively of β-arr-dependent signaling driven by ET-1R [10, 60], that promotes biological responses differing quantitatively and qualitatively in promoting tumor progression. Thus, β-arr1 responds to ET-1R activation reflecting changes in the dynamic of actin cytoskeleton, which appears to be crucial to integrate multiple signals, setting β-arr functions as an absolute requirement for cancer signaling.
Clinical potential of ET-1R therapeutics controlling β-arrestin signaling
ET-1R is now considered one of the most attractive therapeutic targets in cancer, representing one of the best-characterized systems with respect to functional consequences of GPCR–β-arr interactions. Different findings reveal that ETAR/β-arr interaction is fully engaged in transmitting signals from the membrane to nucleus, promoting early and late events leading to tumor progression. These data illustrate also the utility in the translation of the concept of seeking antagonists with functional selectivity respect to G-protein-independent and β-arr-dependent ET-1 signaling to block cellular responses associated with tumor progression . Considering the effects of β-arr as both cytoplasmic and nuclear messengers in tumor invasion and metastasis as well as in chemoresistance, the translation from basic biology to clinical drug development might consider that disruption of the ETAR/β-arr interaction can impair EMT, invasion, metastasis and chemoresistance, suggesting a possible avenue for therapeutic intervention. A plethora of studies in different human cancer highlighted the efficacy of targeting ETAR in vitro and in preclinical models, in which ETAR blockade with different ETAR-selective antagonists (atrasentan and zibotentan) results in antitumour activity, by concomitant growth inhibition and apoptosis induction, an effect that can be potentiated from combined treatment of chemotherapeutics or targeted therapy [2, 10]. The efficacy of this target therapy is extended to control also drug-resistance and metastasis, as shown in different tumor models [2, 10]. However, the failure of clinical trials using selective antagonists and the screening of antagonists tested for their ability to alter ET-1-driven cancer cell growth and progression, uncovered the dual ETAR/ETBR antagonist as a promising drug for treatment of ET-1R-driven tumors. Macitentan is a non-selective and dual ETAR/ETBR antagonist, approved for the treatment of pulmonary hypertension . Preclinical data in different tumor models showed drug efficacy in controlling tumor growth and metastasis, in monotherapy or in combination with others drugs, such as chemotherapeutic drugs, predicting clinical success [2, 10]. According with a recurring theme in the utilization of molecularly targeting therapeutics that should target both tumor cells and microenvironment where tumor cells thrive, macitentan simultaneously targets cancer cells, which typically express ETAR, and stromal elements through ETBR, enhancing antitumour immune and anti-angiogenic mechanisms. Moreover, considering the decisive role of ET-1 signaling in the physical interactions of cancer cells and tumor-associated stromal cells, to sustain cancer metastasis as well as to act as chemoprotective mediator, this kind of drug represent a promising therapeutic opportunity [15, 24–27]. Mounting evidence suggests that drugs, like macitentan, serve as effective tools for cancer therapy also for the ability to selectively targeting specific β-arr-dependent downstream signaling . In ovarian cancer, where it has been dissected the role of β-arr in ET-1 signaling, in vivo, silencing of β-arr1 or macitentan treatment, impairing the signaling pathways involved in cell survival, EMT, and invasion, reduces tumor growth, vascularization, intravasation, and metastatic progression, and potentiates the cytotoxic effects of cisplatinum [15, 16]. Continuing efforts to fully understand the biological functions and associated mechanisms of ET-1R will likely facilitate the development of new targets and innovative pharmacological strategies for treating cancer patients. Further investigations will hopefully drive preclinical validated antagonists into clinical studies where their true therapeutic efficacies against cancer vulnerability can be evaluated.
β-arr is a well-known primary effector of GPCR pathway, crucial in tumor growth and progression. Increasing evidences have provided insights into the regulation of this protein and its mechanism of action. The findings highlighted in this review offer a broad overview of the biological activity elicited by ET-1R/β-arr in tumorigenesis and metastasis progression. The above information indicates that ET-1/ET-1R axis activates through β-arr1 many signals on epigenetic inputs that sustain ET-1R activities in cancer and tumor microenvironment. Cancer cells may use different cytoplasmic and nuclear roles of β-arr1 in a manner that may change between different tumors and even into tumoral lesions. Thus an important aspect that deserves attention is the mechanism by which nuclear β-arr1 selects transcriptional partners, revealing new players by which ET-1R/β-arr orchestrate cancer cell behaviour and outcomes. A better understanding of these events may suggest therapeutic antitumoral strategies, for example focusing on the ET-1R antagonist currently used in clinical practice, allowing precise control over signaling pathways. Clearly, being able to block ET-1R and turn-out the β-arr functions would represent a new era for ET-1-therapeutics to be exploited for cancer treatment.
CLL, chronic lymphocytic leukemia; CSC, cancer stem cell; EC, endothelial cells; ECM, extracellular matrix; EGFR, epidermal growth factor receptor; EMT, epithelial-to-mesenchymal transition; ET, Endothelin; ET-1R, endothelin-1 receptor; ETAR, ETA receptor; ETBR, ETB receptor; FOXO1, forkhead box protein O1; GEF, Rho guanine nucleotide exchange factor; GPCR, G protein-coupled receptors; HIF-1, hypoxia-inducible factor; miRNA, microRNAs; MMPs, matrix metalloproteinases; MT1-MMP, membrane type I; NFkB, nuclear factor kappa B; NSCLC, non-small cell lung cancer progression; ROCK1, Rho-associated coiled coil-forming kinase 1; TCGA, The Cancer Genome Atlas; VEGFR-2, vascular endothelial growth factor receptor-2; β-arr1, β-arrestin1
We gratefully acknowledge all members of the laboratory for their constant support and enthusiasm, and Maria Vincenza Sarcone for secretarial assistance.
This work was supported by Associazione Italiana Ricerca sul Cancro (AIRC) to A.B. (AIRC 14199) and L.R. (AIRC 16965).
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LR and AB conceived of the study, and participated in its design and coordination and drafted the manuscript. Both authors read and approved the final manuscript.
The authors declare that they have no competing interests.
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