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Independent Amplification of Two Gene Clusters on Chromosome 4 in Rat Endometrial Cancer: Identification and Molecular Characterization1

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Independent Amplification of Two Gene Clusters on Chromosome 4 in Rat Endometrial Cancer: Identification and Molecular Characterization1 [CANCER RESEARCH 61, 8263–8273, November 15, 2001] Independent Amplification of Two Gene Clusters on Chromosome 4 in Rat Endometrial Cancer: Identification and Molecular Characterization1 Anna Walentinsson,2 Khalil Helou, Ville Wallenius, Hans J. Hedrich, Claude Szpirer, and Go¨ran Levan Department of Cell and Molecular Biology–Genetics, Go¨teborg University, SE-40530 Gothenburg, Sweden [A. W., K. H., G. L.]; Research Centre for Endocrinology and Metabolism, Department of Internal Medicine, Sahlgrenska University Hospital, Go¨teborg University, S-413 45 Gothenburg, Sweden [V. W.]; Laboratory of Animal Science, Medizinische Hochschule, DE-30623 Hannover, Germany [H. J. H.]; and IBMM, Universite´Libre de Bruxelles, BE-6041 Gosselies, Belgium [C. S.] ABSTRACT sequences has been found to be quite simple and consisting of con- tinuous repeats of not much more than the target gene (6, 7). However, The BDII rat is genetically predisposed to hormone-dependent endo- a more common situation is that the amplified sequences are struc- metrial adenocarcinoma and was used to model human cancer. Tumors turally rather complex and sometimes also internally rearranged, arising spontaneously in strain crosses involving BDII rats were analyzed by means of comparative genome hybridization. The most common aber- encompassing two or more coamplified genes, including the target ration was amplification of the proximal region of rat chromosome 4, gene (8, 9). Hence, the prevalence of gene amplification in diverse centered around bands q12-q22. The copy numbers of 15 cancer-related tumor types, as well as its biological and clinical significance in genes from the region were examined in tissue cultures of 11 endometrial neoplastic development, makes amplified chromosomal regions inter- carcinomas (10 endometrial adenocarcinomas and 1 endometrial squa- esting targets for detailed genetic analysis. Identification and charac- mous cell carcinoma) and one peritoneal mesothelioma. Amplification in terization of the amplified genes can provide valuable insights into the rat chromosome 4 was detected in six tumors (50%), five of which carried pathogenesis of cancer and may also yield molecular markers for the two separate amplified regions, situated at 4q12-q13 and 4q21-q22, inter- evaluation of prognosis and therapy. rupted by a nonamplified segment at 4q13-q21.1. The genes Cdk6 (cyclin- Carcinoma of the uterine corpus, also known as endometrial carci- dependent kinase 6) and Met (hepatocyte growth factor receptor) were noma, is the most frequently diagnosed malignancy of the female located in the core of each amplified region and were amplified most reproductive tract and the fourth most common cancer among women recurrently and at the highest levels among the genes tested. Using fluo- 3 rescence in situ hybridization on tumor metaphases, it was observed that (10). Still, the molecular genetic features of this tumor have yet to be the amplified Cdk6 and Met sequences were situated on typical homoge- described in significant detail. The inbred BDII rat strain is genetically 4 neously staining regions (HSRs). In three tumors, both genes were ampli- prone to spontaneous hormone-dependent EAC (11) and may serve fied in the same HSRs, whereas in two tumors, the amplified sequences of as a genetic model system of this tumor type. In a series of uterine each gene were situated in separate HSRs. In addition, Cdk6 and Met tumors (mostly EACs) developed in F1, F2, and backcross progeny amplification was consistently associated with a corresponding increase in from crosses between BDII rats and rats of either of two nonsuscep- gene expression, suggesting that the two genes might represent the targets tible strains (BN and SPRD), a previous cytogenetic investigation for the amplifications. In the sixth tumor, which carried amplified se- disclosed repeatedly occurring manifestations of gene amplification in quences of Met but not of Cdk6, coexpression of Met and the normally the form of HSRs. By using CGH, we could conclude that most silent hepatocyte growth factor gene (Hgf; the ligand of Met) was ob- served. This finding suggests that an autocrine signaling circuit might be commonly, the amplified sequences originated from a region in prox- operating in this particular tumor. Taken together, our findings suggest imal RNO4, centered around bands q12-q22 (12). Similar amplifica- that up-regulation of Cdk6 and/or Met may contribute to the development tion in the proximal part of RNO4 has been detected previously in a of endometrial cancers in the BDII rat. subset of 7, 12-dimethylbenz[a]anthracene-induced rat sarcomas (13– 15), suggesting that involvement of this chromosome region repre- sents a major pathway in a variety of tumor types. In the present INTRODUCTION investigation, we have undertaken a detailed qualitative and quanti- tative characterization of the amplification of RNO4-derived se- Lines of evidence suggest that the development of neoplastic dis- quences. Our findings suggest that at least two subregions are in- ease requires multiple genetic lesions, ranging from single nucleotide volved in independent amplifications in these tumors. Each of the alterations to gross chromosomal changes, occurring sequentially in a regions contains cancer-related genes, which may interact in the cell lineage (1). DNA amplification represents one major molecular development of endometrial cancers. pathway that is thought to play a pivotal role in tumor development, in view of the fact that it provides a mechanism by which tumor cells can trigger enhanced expression of genes whose products are involved MATERIALS AND METHODS in cell proliferation (2). In human cancers, the number of reports on gene amplification, often in relation to progressive tumor growth and Tumor Material. Females of the inbred rat strain BDII/Han are predis- posed to cancer in the endometrium of the uterus (EAC; Refs. 11 and 16). poor prognosis, is continually growing (3–5). In the majority of cases Virgin females (Ͼ90%) will develop this neoplasm, usually before 24 months in which the amplified chromosome region has been identified and of age. When BDII/Han rats were interbred with rats from the two nonsus- characterized, a proto-oncogene appears to be the target on which ceptible strains BN/Han and SPRD-Cu3/Han, a large fraction of the F1, F2, selection acts (4). In some tumors, the architecture of the amplified and backcross animals spontaneously developed tumors. Most of these tumors were pathologically characterized as EAC, but in addition, some other types of Received 6/22/01; accepted 9/19/01. uterine and nonuterine tumors were present (see Ref. 12). The main material The costs of publication of this article were defrayed in part by the payment of page for the present investigation was 12 tissue cultures derived from 11 endome- charges. This article must therefore be hereby marked advertisement in accordance with 18 U.S.C. Section 1734 solely to indicate this fact. 1 Supported by grants from the European Commission (contract ERBBio4CT960562), 3 Internet address: http://www.cancer.org. the Swedish Cancer Society, the Nilsson-Ehle Foundation, and the IngaBritt and Arne 4 The abbreviations used are: EAC, endometrial adenocarcinoma; HSR, homoge- Lundberg Research Foundation. neously staining region; CGH, comparative genome hybridization; RNO4, rat chromo- 2 To whom requests for reprints should be addressed, at Department of Cell and some 4; ESCC, endometrial squamous cell carcinoma; FISH, fluorescence in situ hybrid- Molecular Biology–Genetics, Go¨teborg Univeristy, Box 462, S-405 30 Gothenburg, ization; PAC, P1 artificial chromosome; RT-PCR, reverse transcription-PCR; HGF, Sweden. Phone: 46-31-7733298; Fax: 46-31-7732599; E-mail: anna.walentinsson@ hepatocyte growth factor; MET, HGF receptor; HSA7, human chromosome 7; DCSE, gen.gu.se. diploid chromosome set equivalent; CDK, cyclin-dependent kinase; SF, scatter factor. 8263 Downloaded from cancerres.aacrjournals.org on October 1, 2021. © 2001 American Association for Cancer Research. GENE AMPLIFICATION IN RAT ENDOMETRIAL CANCER Table 1 Oligonucleotide sequences of primer pairs used in RT-PCR and size in bps of corresponding amplified fragmentsa PCR fragment Gene symbol Gene description Forward primer Reverse primer size (bp) Cdk5 Cyclin-dependent kinase 5 ggaaggtaatggaaccacga gcagggagaatctgccataa 419 Hgf Hepatocyte growth factor (scatter factor) cccaaatgtgacgtgtcaag tgttttgttttggcacagga 335 Dmtf1 Cyclin D binding myb-like transcription factor 1 aggatacctgcaacacaggg gcaatttgccttttgatggt 373 Abcb1 ATP-binding cassette, subfamily B (MDR/TAP/PGY), member 1 catcgacagcttctcaacca actcagaggcaccagtgtca 836 Cyp51 Cytochrome P450, 51 (lanosterol 14-␣-demethylase) ccttcacgcttagccttgtc gtatgcaactcccttcccaa 332 Cdk6 Cyclin-dependent kinase 6 gcctatgggaaggtgttcaa tgaagaaagtccagacctcg 344 Tac1 Tachykinin, precursor 1 (substance K, substance P) gtttgcagaggaaatcggtg gcgcttctttcataagccac 312 Asns Asparagine synthetase ctttccgtgcagtgtctgag tccaggcctcctgataaaag 746 Cav1 Caveolin 1 agattgatctggtcaaccgc atctcttcctgcgtgctgat 392 Met Hepatocyte growth factor receptor (MET proto-oncogene) aaagccaatgtgtcaggagg tcgggagggtaggaagagtt 317 Wnt2 Wingless-type MMTV integration site family member 2 tccttccagctctgttgttg gcctttgtttacgccatctc 262 Cftr Cystic fibrosis transmembrane conductance regulator tgagggcagcagctattttt ttgttccaggtggtagaggc 180 Smoh Smoothened (Drosophila) homolog cacttaccagcctctctcgg ctgaaggtgatgagcacgaa 360 Braf V-raf murine sarcoma viral oncogene homolog B1
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