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ZFP91—A Newly Described Gene Potentially Involved in Prostate Pathology

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ZFP91—A Newly Described Gene Potentially Involved in Prostate Pathology Pathol. Oncol. Res. DOI 10.1007/s12253-013-9716-z RESEARCH ZFP91 —A Newly Described Gene Potentially Involved in Prostate Pathology Lukasz Paschke & Marcin Rucinski & Agnieszka Ziolkowska & Tomasz Zemleduch & Witold Malendowicz & Zbigniew Kwias & Ludwik K. Malendowicz Received: 26 May 2013 /Accepted: 18 October 2013 # The Author(s) 2013. This article is published with open access at Springerlink.com Abstract In search for novel molecular targets in benign pros- Keywords Benign prostate hyperplasia . Prostate cancer . tate hyperplasia (BPH), a PCR Array based screening of 84 Prostate cancer cell lines . ZFP91 genes was performed. Of those, expression of ZFP91 (ZFP91 zinc finger protein) was notably upregulated. Limited data concerning the function of ZFP91 product show that it is a Introduction potential transcription factor upregulated in human acute mye- logenous leukemia and most recently found to be the non- Several lines of evidence show that prostate health could be canonical NF-κB pathway regulator. In order to test this finding adversely affected by obesity [1]. Among other findings, it on a larger number of samples, prostate specimens were obtain- was proven that obesity increases the risk of more aggressive ed from patients undergoing adenomectomy for BPH (n =21), prostate cancer [2], prostate enlargement in men with local- and as a control, from patients undergoing radical cystectomy ized prostate cancer [3], and developing benign prostate hy- for bladder cancer (prostates unchanged pathologically, n =18). perplasia (BPH) [4]. Similar studies were performed on cultured human prostate The starting point for this study was to analyze expression cancer cell lines: LNCaP, DU145, 22Rv1, PC-3; as well as of obesity-related genes in BPH tissue specimens compared to normal prostate epithelial cells—PrEC. Methods employed control prostates. Using a PCR Array based screening of 84 included: Human Obesity PCR Array (Qiagen), QPCR and genes, three genes with significantly changed expression Western blotting. QPCR studies confirmed significant overex- levels were found: ZFP91 zinc finger protein (ZFP91), inter- pression of ZFP91 in BPH samples. On a protein level, how- leukin 1 receptor, type I (IL1R1)andtumornecrosisfactor ever, comparison between normal and BPH prostates revealed (TNF). However, after a conventional QPCR validation of the insignificant differences. As for prostate cell lines examined, all results on a larger number of samples, only ZFP91 emerged as expressed ZFP91 mRNA. Western blotting analysis showed potentially involved in prostate pathology. Surprisingly markedly higher protein levels of ZFP91 in all cancer cell lines enough, its presence on a “Human Obesity RT2 Profiler in comparison with normal (PrEC) cells. In conclusion, the PCR Array” was a coincidence, as until yet it has no known upregulated ZFP91 mRNA in BPH, not accompanied by par- association with obesity. Most probably it was because allel changes in ZFP91 protein levels, together with ZFP91 ZFP91 is situated adjacent to ciliary neurotrophic factor re- protein abundance in prostate cancer cell lines suggest ZFP91 ceptor (CNTFR, an anorectic gene) on a 11 chromosome and a involvement in these prostate diseases. co-transcribed mRNA of the two was found in testis, however this transcript is thought to be non-coding (Gene ID: 386607). ZFP91 encodes a 63.4 kDa nuclear protein with structural * : : : : L. Paschke ( ) M. Rucinski A. Ziolkowska T. Zemleduch motifs characteristic of transcription factor [5]. In mammals it L. K. Malendowicz Department of Histology and Embryology, Poznan University is expressed ubiquitously in various cell types and is known to of Medical Sciences, 6 Swiecicki St., 60-781 Poznan, Poland be highly conservative, e.g. according to NCBI human ZFP91 e-mail: [email protected] shares 92.6 % homology with mouse ZFP91 at DNA level and 90.8 % at protein level [6]. In 2003, Unoki et al. found ZFP91 W. Malendowicz : Z. Kwias Department of Urology and Urooncology, expression to be markedly upregulated in mononuclear cells Poznan University of Medical Sciences, Poznan, Poland from patients with acute myelogenous leukemia (AML) and in L. Paschke et al. many neoplastic blood cell lines. Moreover, it was shown that periurethral area. Material was conserved in RNALater suppression of ZFP91 expression could increase cell apopto- (Ambion, Austin, USA) and kept at −20 °C until used. sis rate [5]. To date, proteomic based studies showed ZFP91 interaction with a few proteins. Firstly, with ARF tumor Cell Culture suppressor (cyclin-dependent kinase inhibitor 2A, isoform 4), which is known for its induction of p53-dependent cell Prostate cancer cell lines: LNCaP, DU145, PC-3 and 22Rv1 death or growth arrest in response to activated oncogenes [7]. were obtained from American Type Culture Collection Secondly, with mitogen-activated protein kinase kinase kinase (ATCC, Manassas, USA) and maintained in RPMI-1640 14 (MAP3K14) also known as NF-κB-inducing kinase Medium (LNCaP and 22Rv1), F12K Medium (PC-3) and (NIK)—a key kinase of the non-canonical (alternative) Eagle’s Minimum Essential Medium (DU145). Media were NF-κB activation pathway [8]. Lastly, with the von Hippel– purchased from ATCC and supplemented with 10 % fetal Lindau tumor suppressor (pVHL) and the hypoxia inducible bovine serum and antibiotic/antimycotic solution. Normal factor-1α (HIF-1α)—playing an important role in cancer prostate epithelial cells (PrEC) were obtained from Lonza malignancy and metastasis [9]. As for ZFP91 function, it is (Walkersville, USA) and cultured in serum-free PrEGM recognized as an atypical E3 ubiquitin-protein ligase. It medi- (Lonza). The cells were grown in 75 cm2 flasks at 37 °C in ates a K63-linked ubiquitination of MAP3K14, leading to its ahumidifiedatmosphereof5%CO2. The culture medium stabilization and activation of the non-canonical NF-κBpath- was changed every day for PrEC cells and every 2 days for way, serving as a selective regulator of this pathway target other cell lines. When cells reached approximately 80 % genes expression [8, 10]. confluence, they were either subcultured or harvested by In 2008 Lee et al. patented potential therapeutic methods 0.25 % trypsin–EDTA. Harvested cells were frozen in employing ZFP91 functioning modifications. Their invention −80 °C for further analyses. was based on several novel findings regarding ZFP91 signif- icance. Among them, finding that ZFP91 expression is up- Total RNA and Protein Extraction regulated by NF-κB binding to its promoter sequences in ZFP91 5′ upstream region. On the other hand, ZFP91 over- Total RNA was extracted by means of TRI reagent, using expression results in increased NF-κB activity, which is dose additional Dounce homogenization for tissues, followed by a dependent and dependent on MAP3K14 presence. Moreover, standard procedure combined with RNA purification using ZFP91 possesses potent oncogenic properties confirmed in NucleoSpin RNA II kit (Macherey-Nagel Ltd., Oensingen, several experiments [9]. Switzerland). RNA concentration and purity was determined The present study aimed to investigate ZFP91 expression spectrophotometrically (NanoDrop, Thermo Scientific, on mRNA and protein levels in specimens from human nor- Waltham, USA). For each sample 1 μgoftotalRNAwas mal prostate and BPH. Furthermore, we analyzed pattern of reversely transcribed using MMLV reverse transcriptase kit expression of studied mRNA and protein in prostate cancer (Novazym, Poznan, Poland) using Oligo dT (PE Biosystems, cell lines and normal prostate epithelial cells. Warrington, UK) as primers. The reaction was performed at 42.8 °C for 60 min (UNO II thermocycler, Biometra, Goettingen, Germany). Materials and Methods Total protein was extracted using homogenization in an ice-cold RIPA buffer with addition of Complete Mini Prostate Tissue Specimens Protease Inhibitor Cocktail Tablets (Roche Diagnostics Corporation, Indianapolis, USA). Afterwards, samples Studies were performed on patients from the Department of were incubated with an agitation for an hour and cen- Urology and Urooncology, Poznan University of Medical trifuged at 20,000× g for 30 min to remove cell debris Sciences. Bioethical Committee of the University provided (all at 4 °C). Protein concentration was determined by consent for the study protocol and each participant signed an Bradford method. informed consent form. Prostate tissue specimens were ob- tained from patients undergoing adenomectomy for BPH, and Quantitative PCR Array as a control, from patients undergoing radical cystectomy for bladder cancer (prostate tissue unchanged pathologically). Human Obesity RT2 Profiler PCR Array was purchased from Tissue samples from control prostates were taken from the SuperArray Bioscience (SABioscience, Frederick, USA). regions adjacent to the colliculus seminalis (in a preliminary PCR was performed on 7900HT Fast RT Real-Time PCR study no differences in studied genes expression were found System (Applied Biosystems), according to the manufac- between this region and region adjacent to connective tissue turer’s instructions. For data analysis, the ΔΔCt method was capsule). BPH samples were taken from the anterior used with the aid of a Microsoft Excel spreadsheet containing ZFP91 gene in prostate pathology algorithms provided by the manufacturer. Fold-changes were gene profiling studies of prostate tissues, both malignant then calculated and expressed as log-normalized ratios of and not [15]. values from BPH/control tissues. PCR efficiency
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