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FBXW7/Hcdc4 Is a General Tumor Suppressor in Human Cancer

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FBXW7/Hcdc4 Is a General Tumor Suppressor in Human Cancer Priority Report FBXW7/hCDC4 Is a General Tumor Suppressor in Human Cancer Shahab Akhoondi,1 Dahui Sun,2 Natalie von der Lehr,1 Sophia Apostolidou,3 Kathleen Klotz,2 Alena Maljukova,1 Diana Cepeda,1 Heidi Fiegl,3 Dimitra Dofou,3 Christian Marth,4 Elisabeth Mueller-Holzner,4 Martin Corcoran,1 Markus Dagnell,1 Sepideh Zabihi Nejad,5 Babak Noori Nayer,5 Mohammad Reza Zali,5 Johan Hansson,1 Susanne Egyhazi,1 Fredrik Petersson,1 Per Sangfelt,6 Hans Nordgren,6 Dan Grander,1 Steven I. Reed,7 Martin Widschwendter,3 Olle Sangfelt,1 and Charles Spruck2 1Cancer Center Karolinska, Karolinska Hospital, Stockholm, Sweden; 2Department of Tumor Cell Biology, Sidney Kimmel Cancer Center, San Diego, California; 3Department of Gynaecological Oncology, Institute for Women’s Health, University College London, London, United Kingdom; 4Department of Obstetrics and Gynecology, Medical University Innsbruck, Innsbruck, Austria; 5Research Center for Gastrointestinal and Liver Disease, Taleghani Hospital, Tehran, Iran; 6Department of Medical Sciences, Pathology, and Gastroenterology, Uppsala University Hospital, Uppsala, Sweden; and 7Department of Molecular Biology, The Scripps Research Institute, La Jolla, California Abstract cycle progression, and cellular division (1). The latter processes are The ubiquitin-proteasome system is a major regulatory primarily regulated by two ubiquitin ligases known as the pathway of protein degradation and plays an important role anaphase-promoting complex (APC) and SCF. SCF ubiquitin ligases in cellular division. Fbxw7 (or hCdc4), a member of the F-box are composed of Cul1, Rbx1 (also called Roc1 or Hrt1), and Skp1 family of proteins, which are substrate recognition compo- bound to a member of the F-box protein family, which provide substrate specificity. Approximately 65 F-box proteins exist in nents of the multisubunit ubiquitin ligase SCF (Skp1-Cdc53/ f Cullin-F-box-protein), has been shown to mediate the humans, each characterized by an 40-amino-acid F-box motif ubiquitin-dependent proteolysis of several oncoproteins in- that associates with the SCF complex through Skp1 (1). cluding cyclin E1, c-Myc, c-Jun, and Notch. The oncogenic In S. cerevisiae, the F-box protein Cdc4 plays a critical role in cell potential of Fbxw7 substrates, frequent allelic loss in human cycle control by mediating the ubiquitin-dependent proteolysis of cancers, and demonstration that mutation of FBXW7 cooper- DNA replication protein Cdc6 and cyclin-dependent kinase (Cdk) ates with p53 in mouse tumorigenesis have suggested that inhibitors Far1 and Sic1 (2, 3). Similarly, the orthologue of Cdc4 in Fbxw7 could function as a tumor suppressor in human cancer. humans, designated Fbxw7 (also known as hCdc4, Fbw7, or SEL-10), Here, we carry out an extensive genetic screen of primary mediates the ubiquitin-dependent proteolysis of several key regula- tumors to evaluate the role of FBXW7 as a tumor suppressor tory proteins involved in cell division and cell fate determination, in human tumorigenesis. Our results indicate that FBXW7 is including cyclin E1, c-Myc, c-Jun, Notch, and Aurora-A (2). Furthermore, FBXW7 deficiency in mice has been shown to result in inactivated by mutation in diverse human cancer types with f an overall mutation frequency of f6%. The highest mutation early embryonic lethality (day 10.5) with embryos exhibiting abnormalities in hematopoietic and vascular development (2). frequencies were found in tumors of the bile duct (cholangio- carcinomas, 35%), blood (T-cell acute lymphocytic leukemia, Several lines of evidence suggest that Fbxw7 is a putative tumor 31%), endometrium (9%), colon (9%), and stomach (6%). suppressor in human tumorigenesis, including (a) the well-defined Approximately 43% of all mutations occur at two mutational oncogenic potential of its putative substrates (described above); (b) 465 479 localization of FBXW7 to chromosome 4q31.3, which is deleted in ‘‘hotspots,’’ which alter Arg residues (Arg and Arg ) that f are critical for substrate recognition. Furthermore, we show 30% of human cancers; (c) the finding that allelic loss of FBXW7 that Fbxw7Arg465 hotspot mutant can abrogate wild-type cooperates with p53in tumorigenesis in mice (4); and ( d) demon- Fbxw7 function through a dominant negative mechanism. stration that targeted disruption of FBXW7 in cultured cells leads to Our study is the first comprehensive screen of FBXW7 an increase in genetic instability (5), a hallmark of human cancers. mutations in various human malignancies and shows that In this study, we carry out an extensive genetic analysis of FBXW7 in primary human tumors of diverse tissue origin to determine its FBXW7 is a general tumor suppressor in human cancer. role as a putative tumor suppressor. We find that FBXW7 is mutated [Cancer Res 2007;67(19):9006–12] in a variety of human tumor types with an overall mutation frequency of f6%. Furthermore, we show that expression of an Introduction Fbxw7 mutant corresponding to one of the major mutational The ubiquitin-proteasome system regulates important cellular hotspots in primary tumors interferes with wild-type Fbxw7 processes including differentiation and development, apoptosis, function, suggesting a potential dominant negative mechanism of protein trafficking, the immune and inflammatory responses, cell Fbxw7 inactivation. Our results show that FBXW7 is a general tumor suppressor in human tumorigenesis and provide insight into how Fbxw7 function is inactivated during tumorigenesis. Note: Supplementary data for this article are available at Cancer Research Online (http://cancerres.aacrjournals.org/). Requests for reprints: Charles Spruck, Sidney Kimmel Cancer Center, 10905 Road Materials and Methods to the Cure, San Diego, CA 92121. Phone: 858-450-5990; Fax: 858-450-3251; E-mail: Tumor specimens. Primary tumor specimens (534 in total) were [email protected]. I2007 American Association for Cancer Research. obtained from (a) Department of Obstetrics and Gynecology, Innsbruck doi:10.1158/0008-5472.CAN-07-1320 Medical University, Innsbruck, Austria (breast and ovarian tumor specimens); Cancer Res 2007; 67: (19). October 1, 2007 9006 www.aacrjournals.org Downloaded from cancerres.aacrjournals.org on September 26, 2021. © 2007 American Association for Cancer Research. The FBXW7 Gene Is Mutated in a Variety of Human Tumors (b) Sidney Kimmel Cancer Center, San Diego, CA (lung and prostate); (c) 26% induced a premature termination of translation (nonsense; Department of Pathology and Gastroenterology, Uppsala University Table 1). FBXW7 mutations were found to occur throughout the Hospital, Uppsala, Sweden (bile duct and liver); (d) Department of coding region, including the F-box motif, WD40 repeats, and two of Oncology/Pathology, Karolinska Hospital, Stockholm, Sweden (hematologic three unique 5¶ exons that determine the Fbxw7 isoforms (Fig. 1). malignancies and melanomas); and (e) Research Center for Gastrointestinal Interestingly, isoform-specific mutations were found to represent and Liver Disease, Talghani Hospital, Tehran, Iran (stomach, bladder, colon, f and esophagus). This project was approved by the research ethics 6% of FBXW7 mutations. Approximately 43% of all FBXW7 committees at the Karolinska Institute, Uppsala University Hospital, and mutations occurred at two mutational hotspots positioned at 465 479 Shahid Beheshti University of Medical Sciences. A total of 1,556 primary codons Arg (nucleotides 1,393–1,394; 29%) and Arg (nucleo- tumor specimens (our results pooled with previously published data) are tides 1,435–1,436; 14%). Additional minor mutational hotspots were included in our final analysis. detected at nucleotides 670 (Arg224; 3%), 832 (Arg278; 4%), 1,177 FBXW7 mutation screening. Screening for FBXW7 mutations was done (Arg393; 3%), and 1,745 (Ser582; 4%). Molecular modeling revealed as previously described (6). that codons Arg465, Arg479, and Ser582 are localized to the surface or Methylation analysis. Methylation status of mutational hotspot 1435-6 lumen of the h-propeller structure of Fbxw7; Arg393 is at the rear of was determined by bisulfite sequencing as described (7). PCR amplifications the h-propeller structure; and Arg278 is situated close to the were done with primers 5¶-TGTGGAATGTAGAGATTGGAGAATGTATA-3¶ ¶ ¶ isoform-specific NH2 terminus of Fbxw7. and 5 -AAAAAATCCCAACCATAACAAAATTT-3 . FBXW7 Antibodies. Antibodies used in this study include anti-Flag (Sigma), Mutation hotspots in correspond to methylated CG ¶ anti-Skp1 (Lab Vision), anti–cyclin E1 (HE12, Santa Cruz Biotechnology), anti– dinucleotides with signatures of deaminations of 5 -methyl- phospho-T380 cyclin E1 (Santa Cruz Biotechnology), anti-Myc (9E10, Santa cytosine. Investigation of the mutational hotspots of FBXW7 Cruz Biotechnology), anti–glutathione S-transferase (GST; Santa Cruz revealed that all seven are centered on CG dinucleotides, potential Biotechnology), anti-actin (Santa Cruz Biotechnology), anti-p53(DO-1, Santa sites of DNA methylation in humans. Interestingly, the prominent Cruz Biotechnology), and anti-p21 (Ab-1, Calbiochem). Precipitation experi- mutation type that occurs at each mutational hotspot was either a ments were done using anti-Flag agarose (Sigma) or Glutathione-Sepharose C!TorG!A transition within the CG dinuclotide, consistent with (GE Healthcare). Immunohistochemical analysis of p21 and p53was done as the spontaneous deamination of 5¶-methylcytosine!thymine in described (8). Analysis of ploidy was determined by Feulgen staining of DNA (18). Because 5¶-methylcytosine has
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