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Regulation of Aminopeptidase a Expression in Cervical Carcinoma: Role of Tumor–Stromal Interaction and Vascular Endothelial Growth Factor

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Regulation of Aminopeptidase a Expression in Cervical Carcinoma: Role of Tumor–Stromal Interaction and Vascular Endothelial Growth Factor Laboratory Investigation (2004) 84, 639–648 & 2004 USCAP, Inc All rights reserved 0023-6837/04 $25.00 www.laboratoryinvestigation.org Regulation of aminopeptidase A expression in cervical carcinoma: role of tumor–stromal interaction and vascular endothelial growth factor Takayasu Suganuma1, Kazuhiko Ino1, Kiyosumi Shibata1, Seiji Nomura1, Hiroaki Kajiyama1, Fumitaka Kikkawa1, Nobuo Tsuruoka2 and Shigehiko Mizutani1 1Department of Obstetrics and Gynecology, Nagoya University Graduate School of Medicine, Nagoya, Japan and 2Institute for Health Care Science, Suntory Ltd, Osaka, Japan We previously demonstrated that aminopeptidase A (APA), a membrane-bound metallopeptidase degrading bioactive peptides such as angiotensin II (Ang II), is expressed in neoplastic lesions of the uterine cervix, and that its expression is upregulated as the lesion progresses from cervical intraepithelial neoplasms (CIN) toward invasive squamous cell carcinomas (SCC). The present study investigated the regulatory mechanisms involved in APA expression and its potential role in cervical carcinoma. Immunohistochemical staining in high-grade CIN and SCC tissues showed that APA was strongly expressed at the edge of lesions adjacent to cervical stromal cells. Fluorescence-activated cell sorting analysis demonstrated that cell surface APA expression was extremely low in three human SCC cell lines, SiHa, TCS and CaSki, under basal conditions. However, both contact and noncontact cocultures with human cervical fibroblasts resulted in the induction of APA expression in these SCC cells. APA expression was also induced in vivo when TCS cells were subcutaneously inoculated into nude mice. Furthermore, APA expression and enzymatic activity were enhanced by addition of the conditioned medium (CM) from fibroblast culture, but not by heat-treated CM. Among the various cytokines tested, vascular endothelial growth factor (VEGF) significantly increased APA activity, and induction of APA by the fibroblast CM was partly inhibited by anti-VEGF neutralizing antibody. Finally, APA cDNA-transfected APA- overexpressing TCS cells significantly reduced the Ang II-induced cell invasion ability as compared with parental or control vector-transfected TCS cells, although there was no significant difference in cellular proliferation among them. These results suggested the importance of tumor–stromal interaction for the regulation of APA expression in the microenvironment of cervical carcinoma and the potential role for this peptidase in regulating tumor invasion through inactivation of Ang II activity. Laboratory Investigation (2004) 84, 639–648, advance online publication, 29 March 2004; doi:10.1038/labinvest.3700072 Keywords: aminopeptidase A; angiotensin II; cervical carcinoma; fibroblast; invasion; VEGF Cell surface peptidases play a key role in the control progression. Recent studies have demonstrated that of growth, differentiation and signal transduction of several membrane-bound peptidases, including neu- many cellular systems by modulating the activity of tral endopeptidase (NEP),3,4 dipeptidyl peptidase IV bioactive peptides and regulating their access to (DPPIV)5,6 and aminopeptidase N (APN),7,8 are receptors or adjacent cells.1,2 Thus, abnormal involved in tumor cell growth, differentiation and changes in expression pattern and catalytic function invasion in various human malignancies through of peptidases result in altered peptide activation, upregulation or downregulation of their expression which disrupts normal cellular homeostasis and may dependent on the types of malignancies. contribute to neoplastic transformation or tumor Aminopeptidase A (APA, angiotensinase, EC 3.4.11.7) is also a zinc-dependent membrane-bound peptidase, which specifically cleaves the amino- Correspondence: Dr Kazuhiko Ino, MD, Department of Obstetrics terminal glutamyl or aspartyl residue from peptide and Gynecology, Nagoya University Graduate School of Medicine, substrates such as angiotensin II (Ang II).9 APA has 65 Tsurumai-cho, Showa-ku, Nagoya 466-8550, Japan. recently been cloned and proven to be identical to E-mail: [email protected] 10 Received 2 October 2003; revised 20 December 2003; accepted 22 the mouse B-lymphocyte lineage marker BP-1 or December 2003; published online 29 March 2004 the human kidney differentiation antigen gp160.11 Regulation of APA expression in cervical carcinoma T Suganuma et al 640 Physiologically, APA is expressed in vascular USA). Anti-VEGF neutralizing antibody was pericytes12,13 and renal proximal tubules/glome- purchased from Santa Cruz Biotechnology (Santa ruli,14 and involved in the regulation of blood Cruz, CA, USA). pressure by converting Ang II to Ang III in the catabolic pathway of the renin–angiotensin sys- tem.15 We purified APA from the human placenta16 Cell Lines and Culture and demonstrated the role of this enzyme in Human cervical cancer (SCC) cell lines, SiHa, TCS regulating blood pressure during pregnancy.17 and CaSki, were used. SiHa and CaSki were However, there have been few reports on APA purchased from ATCC (Manassas, VA, USA). TCS expression and its functional significance in was a generous gift from RIKEN (Saitama, Japan). tumor cells.18–20 Human choriocarcinoma cell line BeWo was also We have recently demonstrated that APA was purchased from ATCC. All cell lines were main- expressed in neoplastic lesions of the uterine cervix, tained in DMEM or RPMI medium supplemented and its expression was upregulated as the lesion with 10% fetal calf serum (FCS) and penicillin/ progresses from cervical intraepithelial neoplasms streptomycin and incubated at 371C in a humidified (CIN) toward invasive squamous cell carcinomas atmosphere of 5% CO . (SCC).21 However, the regulatory mechanisms for 2 Human fibroblasts were obtained from tissue APA expression and its functional role in the specimens of the uterine cervix, which were progression of cervical carcinoma remain to be surgically resected from patients with benign clarified. It has been suggested that tumor–stromal gynecologic diseases under informed consent. interaction is a critical factor in both tumor invasion Primary cultures of fibroblasts were established and proliferation, and the stromal cells play a key as previously described22 with minor modifica- role in tumor cell invasion by providing specific tions. Briefly, cervical stromal tissues were finely soluble factors and extracellular matrix (ECM) minced and digested with collagenase and molecules.22,23 In fact, induction of matrix metallo- trypsin. Then the suspension was passed through a proteinases (MMPs) and their activation, which are 200 mm pore nylon mesh to remove undigested essential for ECM degradation, are demonstrated by fragments. The collected cells were washed with contact with stromal fibroblasts or macrophages.24,25 phosphate-buffered saline (PBS) and cultured in Based on these findings, in the present study, DMEM with 10% FCS. Fibroblasts were confirmed we cocultured cervical cancer cells with cervical by immunostaining with monoclonal antibodies to fibroblasts in vitro under contact or noncontact cytokeratin 14 and vimentin (Dako, Carpintaria, CA, conditions, mimicking in vivo tumor–stromal inter- USA) as previously described.22 Fibroblasts were actions. Using these systems, we examined the APA cultured up to 10 passages and were used at expression levels and attempted to identify factors passages three to five. The conditioned medium responsible for APA induction in cervical carcino- (CM) was collected from subconfluent cultures ma. Furthermore, we transfected APA cDNA into of the fibroblasts after incubation in six-well cervical cancer cells to obtain APA-overexpressing culture plates (1 Â 105 cells/well) in serum-free cells, and attempted to clarify the role for APA in the medium for 24 h. invasiveness and proliferation of cervical cancer cells in the presence or absence of its specific peptide substrate Ang II. Co-culture Experiments In contact co-culture experiments, cervical cancer cells (1 Â 104 cells/well) alone or fibroblasts Materials and methods (2 Â 104 cells/well) alone or in combination were Reagents and Antibodies seeded in four-well chamber glass slides (LabTek, Nunc Inc., Naperville, IL, USA), and cultured for Human Ang II was purchased from the Peptide 24 h in serum-free medium. The cells were washed Institute (Osaka, Japan). Human recombinant vas- with PBS and fixed with 4% paraformaldehyde, cular endothelial growth factor (VEGF), transform- and immunocytochemical staining was performed ing growth factor (TGF)-b1, tumor necrosis factor as described below. Noncontact co-culture experi- (TNF)-a, interferon (IFN)-g, and interleukin (IL)-1b ments were performed using 24-well transwell were all purchased from Sigma-Aldrich (St Louis, chambers with a 0.4 mm pore membrane (Corning, MO, USA). NY, USA). Different numbers of fibroblasts (1 Â 104 Rabbit anti-APA polyclonal antibody was raised or 1 Â 105 cells) were seeded in the upper compart- against a synthetic peptide composed of the 18- ments, while cervical cancer cells (5 Â 104 cells) amino-acid sequence from Ser257 to Thr274 were seeded in the lower compartments. After (SNMPVAKEESVDDKWTRT) in human APA as incubation in serum-free medium for 24 h, APA previously described.20 Mouse monoclonal anti- activity in cervical cancer cells was measured. In body S4 (URO-2) specific to human APA was negative controls, medium alone (no fibroblast) was obtained from Signet Laboratories (Dedham, MA, added to the upper compartments. Laboratory Investigation
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