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. 2017 Jul 19;16(15):1397–1403. doi: 10.1080/15384101.2017.1338987

GRWD1, a new player among oncogenesis-related ribosomal/nucleolar proteins

Takuya Takafuji 1, Kota Kayama 1, Nozomi Sugimoto 1, Masatoshi Fujita 1,✉
PMCID: PMC5553401  PMID: 28722511

ABSTRACT

Increasing attention has been paid to certain ribosomal or ribosome biosynthesis-related proteins involved in oncogenesis. Members of one group are classified as “tumor suppressive factors” represented by RPL5 and RPL11; loss of their functions leads to cancer predisposition. RPL5 and RPL11 prevent tumorigenesis by binding to and inhibiting the MDM2 ubiquitin ligase and thereby up-regulating p53. Many other candidate tumor suppressive ribosomal/nucleolar proteins have been suggested. However, it remains to be experimentally clarified whether many of these factors can actually prevent tumorigenesis and if so, how they do so. Conversely, some ribosomal/nucleolar proteins promote tumorigenesis. For example, PICT1 binds to and anchors RPL11 in nucleoli, down-regulating p53 and promoting tumorigenesis. GRWD1 was recently identified as another such factor. When overexpressed, GRWD1 suppresses p53 and transforms normal human cells, probably by binding to RPL11 and sequestrating it from MDM2. However, other pathways may also be involved.

KEYWORDS: GRWD1, nucleolar stress response, oncogene, p53, PICT1, RPL11, tumor suppressor

Introduction

Certain ribosomal or ribosome biosynthesis-related proteins (hereafter termed ribosomal/nucleolar proteins) have recently emerged as important oncogenesis-associated factors. Some act as tumor suppressors, whereas others act as tumor promoters (Tables 1 and 2). Tumor suppressive ribosomal/nucleolar proteins are characterized as those whose dysfunction by genetic mutations causes cancer-prone ribosomopathies such as Diamond-Blackfan anemia (DBA), 5q− syndrome, and T-cell acute lymphoblastic leukemia (T-ALL) (Table 1). Ribosomopathies are defined as disorders resulting from deficiencies in a ubiquitous and fundamental biochemical process, namely, ribosome biogenesis. Despite their common etiology, ribosomopathies show variable clinical manifestations with apparently tissue-specific phenotypes. Although the molecular mechanism underlying such heterogeneity is a very intriguing issue, it will not be discussed in this review (for reviews, see1,2). Interestingly, many ribosomopathies are accompanied by a predisposition to cancer.1,2 It remains unclear whether other ribosomopathies are truly not associated with cancer predisposition. This is partly due to difficulties in establishing genotype-phenotype correlation in ribosomopathies with many causative genes and variable phenotypes. The existence of many causative genes also makes it difficult to experimentally explore their biological functions. Nevertheless, the ribosomal protein-MDM2-p53 axis is one well-known and well-studied pathway that may account for the cancer predisposition seen with several ribosomopathies (Fig. 1A–D). For example, RPL5 (ribosomal protein L5) and RPL11, whose heterozygous mutation results in DBA, play a crucial role in this cascade.1 We will concisely describe this and other possible mechanisms underlying how certain ribosomal/nucleolar proteins act as tumor suppressive factors.

Table 1.

Examples of possible tumor suppressive ribosomal/nucleolar proteins.

Disease Gene Reference
Diamond-Blackfan anemia RPS7, RPS10, RPS17, RPS19, RPS24, RPS26, RPL5, RPL11, RPL15, RPL26, RPL35A 20-23,41,74,75
5q− syndrome RPS14 19
T cell acute lymphoblastic leukemia RPL5, RPL10, RPL22 34,35,76
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Table 2.

Examples of possible tumor-promoting ribosomal/nucleolar proteins.

Gene Types of cancers affected by the proteins Reference
GRWD1 Lung cancer, bladder cancer, glioma 4
PICT1 Gastric cancer, colorectal cancer, esophageal cancer, hepatocellular carcinoma, oligodendroglioma, non-small cell lung cancer 3,55-60
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Figure 1.

Figure 1.

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A model for p53 regulation by ribosomal/nucleolar proteins. (A) In unstressed cells, tumor suppressive ribosomal proteins (RPs) such as RPL11 localize in the nucleolus, and MDM2 binds to and ubiquitinates p53. As a result, the cellular p53 level is kept low. (B) Nucleolar stress disrupts the nucleolus and releases the RPs into the nucleoplasm, where they interact with MDM2 and inhibit its ubiquitin ligase activity, inducing p53. (C) Other stresses such as DNA double-strand breaks and hypergrowth stimuli (e.g., expression of activated RAS) are also suggested to induce release of the RPs into the nucleoplasm, contributing to p53 induction. It is unclear whether nucleolar breakdown occurs under such conditions. (D) In cancer-prone ribosomopathy cells, the levels of the RPs are decreased by heterozygous mutations (or homozygous mutations for some factors). As a result, the RP-MDM2-p53 pathway cannot function in stressed cells, leading to tumorigenesis. (E) When overexpressed, GRWD1 binds to and inhibits RPL11, thereby down-regulating p53. As a result, tumor formation is promoted. As detailed in the text, PICT1 similarly binds to RPL11 and thereby inhibits p53.

On the other hand, it was recently demonstrated that some ribosomal/nucleolar proteins conversely promote tumorigenesis by modulating the functions of tumor suppressive ribosomal proteins (Table 2). For example, PICT1 (protein interacting with C-terminus 1 of the tumor suppressor phosphatase and tensin homolog) binds to and anchors RPL11 in nucleoli, leading to p53 downregulation and promotion of tumorigenesis (Fig. 1E).3 We recently identified GRWD1 (glutamate-rich WD40 repeat-containing 1) as another such factor.4 When overexpressed, GRWD1 down-regulates p53 and transforms normal human cells in combination with activated mutant KRAS and human papilloma virus E7, which inhibits RB. Consistent with these findings, high expression of GRWD1 is associated with poor prognosis of patients having certain cancers. At least one critical pathway by which GRWD1 acts is binding to RPL11 and sequestrating it from MDM2 (Fig. 1E).4 We will focus on these newly identified players that function as tumor-promoting ribosomal/nucleolar proteins. Finally, some important unclarified issues in the field that should be addressed in the future will be discussed.

Tumor suppressive ribosomal proteins that bind to MDM2 and up-regulate p53

p53 is best known for its role as a tumor suppressor.1,5,6 Under unstressed conditions, the RING finger E3 ubiquitin ligase MDM2 negatively regulates p53 levels by promoting its polyubiquitination-mediated degradation (Fig. 1A).1,5,6 In addition, MDM2 can inhibit p53 transcriptional activity.1,5,6 Other ubiquitin ligases such as Pirh2,7 COP1,8 and Synoviolin-19 have been also implicated in proteolytic regulation of p53. When cells encounter various stresses such as DNA damage, oncogenic activation, and nucleolar stress, p53 is activated by escaping from these ubiquitin ligases and regulates transcription of many coding and noncoding target genes. Finally, activated p53 ensures cellular homeostasis by inducing cell cycle arrest, senescence, apoptosis, changes in metabolism, and DNA repair.5,6,10

Several lines of evidence clearly demonstrate the mechanism by which certain ribosomal proteins, such RPL5, RPL11, RPL23, RPL26, RPS3, RPS7, and RPS14, activate p53. When overexpressed, these proteins can bind to MDM2 and inhibit MDM2-mediated ubiquitination and subsequent degradation of p53 (Fig. 1B).1,11-18 Among them, RPL5, RPL11, RPL26, and RPS7 are causative genes for DBA, and RPS14 is a causative gene for 5q− syndrome.19-23 Under normal cell growth conditions, ribosomal proteins are assembled into nascent ribosomes. When ribosome biogenesis is perturbed, nucleolar disruption and passive diffusion of many ribosomal proteins, including RPL5 and RPL11, from the nucleolus to the nucleoplasm occurs, where they bind to MDM2 and inhibit its ubiquitination activity toward p53, leading to p53 upregulation (Fig. 1B).1,10,24,25

In particular, RPL5 and RPL11 are regarded as crucial p53 regulators in the nucleolar stress response. RPL5 and RPL11, but not RPL23, RPL26, or RPS7, accumulate in non-ribosomal fractions upon impairment of ribosome biogenesis, where they bind to MDM2.26 In addition, depletion of RPL5 or RPL11, but not of RPL23, RPL26, or RPS7, dramatically inhibits p53 induction by actinomycin D, an inducer of nucleolar stress.11,26-29 The importance of the RPL5/RPL11-MDM2-p53 pathway in cancer prevention is convincingly supported by an in vivo mouse model. Knock-in mice that express a MDM2 mutant, MDM2 C305F, which cannot interact with RPL5 or RPL11, exhibit impaired p53 activation upon disruption of ribosome biogenesis and promotion of tumorigenesis.30 RPL5 and RPL11 also play an important role in p53 induction by DNA double-strand breaks or hypergrowth stimuli such as activated RAS or c-myc overexpression (Fig. 1C).26,30-32

In addition, RPS14 may also be a critical regulator of the p53 response. It binds to MDM2 via the central acidic domain and inhibits MDM2-mediated p53 ubiquitination and degradation. Moreover, siRNA-mediated depletion of RPS14 disturbs p53 activation induced by ribosomal stress, but not by DNA damage.17 While RPL26 is reported to bind to and inhibit MDM2 as described above, it may also regulate p53 mRNA translation.33 In particular, RPL26 can affect p53 regulation upon irradiation.33

RPL22, a lineage-specific tumor suppressive ribosomal protein

RPL22 is inactivated in less than 10% of human T-ALL cases. It is a widely expressed component of the 60S large ribosome subunit, but is not essential for core ribosome function. Moreover, germline ablation of the RPL22 gene is not lethal, and RPL22-deficient mice are of normal size, fertile, and healthy.34 However, RPL22 inactivation accelerates the development of thymic lymphoma in a mouse model and also enhances the transformation of both primary and immortalized murine embryonic fibroblasts. Therefore, RPL22 may function as a haploinsufficient tumor suppressor.35 As a possible mechanism underlying the transformation, RPL22 inactivation is suggested to induce the stemness factor Lin28B.35

RPL22 may directly bind to p53 mRNA and down-regulate its protein synthesis in thymic double-negative cells.36 RPL22 interacts with RNA targets via recognition of a stem loop structure with a G-C-U sequence at the neck of the stem.37 RPL22 deficiency up-regulates p53 selectively in thymic αβ T lineage progenitors.38 However, the molecular mechanism(s) underlying this selectivity and the biological relevance of such p53 regulation in tumor prevention remain to be determined.

Which candidate tumor suppressive ribosomal proteins actually suppress tumorigenesis in experimental models?

DBA is characterized by macrocytic anemia with reduced numbers of progenitors in bone marrow. In addition to anemia, DBA patients are also characterized by increased cancer susceptibility.20–23,39 This is caused by mutations in genes encoding components of either the small or large ribosomal subunits, including RPS7, RPS10, RPS17, RPS19, RPS24, RPS26, RPL5, RPL11, RPL26, and RPL35A.1,2,20-23 Among the causative factors, RPL5, RPL11, RPL26, and RPS7 can bind to and inhibit MDM2, as described above. This could explain the cancer-prone phenotype of DBA caused by these factors (Fig. 1D). It will be interesting to investigate whether other DBA factors such as RPS19, a major causative factor of DBA, affect the MDM2-p53 pathway.

Unfortunately, it remains largely unclear whether the DBA factors actually function as tumor suppressors in experimental models. Morgado-Palacin et al. generated a mouse knockout model and showed that homozygous deletion of RPL11 is lethal and that its heterozygous deletion results in chronic anemia. Interestingly, heterozygous RPL11 mutant mice are also highly susceptible to radiation-induced lymphoma.32 On the other hand, the cancer-prone phenotype has not been observed in heterozygous RPS7 mutant mice.40

The RPS19 gene is most frequently mutated (about 25%) in DBA.20,41,42 It remains unclear whether RPS19 can affect the MDM2-p53 pathway. In transgenic mice expressing shRNA against RPS19 under the control of an inducible promotor, RPS19 deficiency induces bone marrow failure, which is rescued by p53 inactivation.43 On the other hand, Matsson et al. reported that embryos with heterozygous RPS19 deletion develop normally, showing no feature of human DBA later in life.44 Thus, it remains unclear whether RPS19 plays a role in tumor suppression in experimental models.

5q− syndrome is caused by a somatically acquired deletion in the long arm of chromosome 5 and is characterized by macrocytic anemia with decreased erythroid progenitors in bone marrow and an increased risk of developing acute myeloid leukemia, similar to DBA.45 RPS14 is thought to be a causative agent of 5q− syndrome.19,45-49 As described above, RPS14 can bind to and inhibit MDM2.17 However, RPS14 haploinsufficiency induces macrocytic anemia but not cancer predisposition in mouse models.50,51

The oncogenic ribosomal/nucleolar protein PICT1 down-regulates RPL11-mediated p53 activation

A recent study suggests that PICT1, also known as GLTSCR2, down-regulates RPL11-mediated p53 activation.3 Because PICT1 stabilizes phosphatase and tensin homolog, a tumor suppressor,52 and its low expression in diffuse glioma and ovarian cancer is correlated with poor prognosis,52-54 it was originally proposed to be a tumor suppressor. In addition, PICT1 overexpression induces apoptosis in cultured glioma cells. On the other hand, individuals with gastric, colorectal, esophageal, and hepatocellular carcinoma, low PICT1 expression, and wild-type p53 have a better prognosis.3,55,56 Moreover, patients having oligodendrogliomas with PICT1 haploinsufficiency have a better prognosis than other patients.57–59 In addition, high expression of PICT1 is associated with poor prognosis in non-small cell lung cancer.60 These findings suggest that PICT1 rather functions as an oncogene.

Sasaki et al. showed that PICT1 inhibits p53 via the RPL11-MDM2-p53 pathway (Fig. 1E). In normal cells, PICT1 binds to and retains RPL11 in the nucleolus, and its deficiency induces RPL11 translocation to the nucleoplasm. The released RPL11 then binds to and inhibits MDM2, leading to p53 activation.3,55,61 A recent study suggests that PICT1 directly binds to 5S rRNA in nucleoli and plays an essential role in 5S RNP (the complex of 5S rRNA, RPL5, and RPL11) integration into ribosomes.62 Furthermore, Maehama et al. reported that nucleolar stress induces proteasome-mediated PICT1 degradation, probably to allow RPL11 to bind to MDM2.63 Although detailed molecular mechanism(s) remains elusive, the PICT1 degradation appears to occur in a polyubiquitination-independent manner.63 In addition, PICT1 is also suggested to be phosphorylated by ATM in response to DNA damage and then degraded. Because PICT1 downregulation leads to p53 activation as described above, this pathway could contribute to the cellular DNA damage response.64 Taken together, these results demonstrate that PICT1 is a negative regulator of the p53 response and a potential oncogene. However, it is still unclear whether PICT1 overexpression actually transforms cells in any experimental models.

The novel oncogenic ribosomal/nucleolar protein GRWD1 down-regulates p53 and promotes tumorigenesis

GRWD1, a WD40 protein that is highly conserved among eukaryotes, has been functionally implicated in ribosome biogenesis.65–67 We identified GRWD1 as a novel Cdt1-binding protein68 and later found that it possesses histone-binding and nucleosome assembly activities and promotes MCM loading, probably by maintaining chromatin openness at replication origins.69 Cdt1 and MCM are essential proteins that form pre-replication complexes required for DNA replication initiation.70 Furthermore, we recently reported that GRWD1 may promote chromatin fluidity by influencing nucleosome structures, e.g., by transient eviction of H2A-H2B.71 On the other hand, GRWD1 is one of the DDB1-interacting WD40 proteins, which are predicted to function as substrate receptors of the Cul4-DDB1 ubiquitin ligase.72,73

Recently, we demonstrated that GRWD1 is a novel oncogene (Fig. 1E).4 We previously found that GRWD1 is overexpressed in cancer cells.69 In a recent paper, we further found that GRWD1 depletion enhances p53 stabilization induced by various stresses, and its overexpression conversely down-regulates p53. Interestingly, in a soft agar colony formation assay and a tumorigenicity assay in nude mice, GRWD1 overexpression, in combination with E7 and activated KRAS, promotes oncogenic transformation of human normal fibroblasts, probably by repressing p53. Furthermore, high expression of GRWD1 is highly associated with poor prognosis in lower-grade brain glioma patients with wild-type p53, but not in those with mutated p53.4 Together with the other functions described above, GRWD1 is a multifunctional protein involved in multiple cellular regulatory pathways, particularly those associated with cell growth control.

GRWD1 down-regulates p53 by binding to RPL11 and sequestrating it from MDM2

How does GRWD1 inhibit p53 and promote tumorigenesis? We identified RPL11 as a novel GRWD1 interactor and further found that GRWD1 interferes with the p53 activation pathway via the RPL11-MDM2 axis by interacting with RPL11 and sequestering it from MDM2 (Fig. 1E).4 As described above, GRWD1 overexpression can confer a tumorigenic capacity in normal human cells. Importantly, this activity is lost with a GRWD1 mutant that cannot interact with RPL11, suggesting that the oncogenic activity of GRWD1 is mediated, at least partly, by its binding to and inhibition of RPL11.4 Therefore, it will be possible to recapitulate cellular transformation by depleting tumor suppressive ribosomal proteins such as RPL11 (in combination with E7 and activated KRAS) using this experimental system.

Concluding remarks and perspective

As summarized above, increasing attention has been paid to many ribosomal/nucleolar proteins as new regulators of oncogenesis. For tumor suppressive ribosomal proteins whose mutations lead to cancer-prone disorders, it is clear that p53 is a critical target molecule. However, it is not yet completely understood how these various factors actually prevent tumorigenesis. For example, it remains unclear how RPS19, a major DBA factor, functions in cancer prevention. A more critical problem is that the tumor suppressive activities of most factors have not been experimentally observed, as discussed above. Extensive generation of the relevant knockout mice would be useful, but is too time-consuming and expensive. In addition, despite the apparent p53 inhibitory activity of RPS14, a causative factor of cancer-prone 5q− syndrome, its haploinsufficiency has not recapitulated cancer predisposition in mouse models to date. In this regard, it will be intriguing to test whether (partial) inhibition of these factors in combination with E7 and activated KRAS can transform normal human cells. This relatively simple assay would be applicable to comprehensive investigation of candidate tumor suppressive (or tumor-promoting) ribosomal/nucleolar proteins.

On the other hand, PICT1 and GRWD1 have emerged as novel oncogenic ribosomal/nucleolar proteins. The oncogenic potential of both factors may be mainly mediated by binding to the tumor suppressive protein RPL11 and sequestering it from MDM2. Clinical data indicate that high expression of these factors is associated with poor prognosis in patients with wild-type p53, at least in certain cancer types. However, the possible relationship between PICT1 and GRWD1 has not been uncovered and should be investigated in the future.

Although the oncogenic ability of GRWD1 is mainly executed by its binding to RPL11, the possibility that GRWD1 overexpression up-regulates ribosome biogenesis and/or DNA replication, contributing to its oncogenic activity, cannot be excluded. Finally, given that GRWD1 also interacts with other growth regulatory factors including RPL23 (ref. 4 and our unpublished data), it remains possible that another pathway(s) also contributes to the oncogenic activity of GRWD1. It will also be interesting to address this issue in the future.

Disclosure of potential conflicts of interest

The authors declare no conflicts of interest in relation to this article.

Acknowledgment

We thank all members of our research group for helpful discussions and critical reading of the manuscript.

Funding

This work was supported in part by grants to Nozomi Sugimoto and Masatoshi Fujita from the Ministry of Education, Science, Sports, Technology and Culture of Japan.

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