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Alteration of PAFAH1B1 in Human Lung Cancer and Its Roles in Tumor Progression and Poor Survival

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Alteration of PAFAH1B1 in Human Lung Cancer and Its Roles in Tumor Progression and Poor Survival BioFormosa（2010）45(2): 63-69 Alteration of PAFAH1B1 in Human Lung Cancer and Its Roles in Tumor Progression and Poor Survival Fang-Yi Lo1,2, Hsiung-Ting Chen2, Han-Shui Hsu3,4, Tsu-Wei Wang1*, Guey-Jen Lee-Chen1* Yi-Ching Wang2,5* 1Department of Life Science, National Taiwan Normal University Taipei, Taiwan 2Department of Pharmacology, College of Medicine, National Cheng Kung University Tainan, Taiwan 3Institute of Emergency and Critical Care Medicine, National Yang Ming University Taipei, Taiwan 4Division of Thoracic Surgery, Taipei Veterans General Hospital Taipei, Taiwan 5Institute of Basic Medical Science, College of Medicine, National Cheng Kung University Tainan, Taiwan. (Received: 7 April 2011, accepted: 6 May 2011) ABSTRACT Rationale and Objectives: Genomic DNA copy number variation is a hallmark of cancer. In our previous array-comparative genomic hybridization (array-CGH) study, we showed that PAFAH1B1 was amplified in lung cancer patients, suggesting that PAFAH1B1 is a potential oncogene in lung cancer. Methods: In this study, we have determined the mRNA and protein expression level of PAFAH1B1 in 91 lung cancer patients using quantitative reverse transcription polymerase chain reaction (qRT-PCR) and immunohistochemistry (IHC). Main Results: The PAFAH1B1 mRNA and protein overexpression frequency were 61.5% (56/91) and 56% (51/91) in lung cancer patients. The results indicated that mRNA and protein overexpression level of PAFAH1B1 was significantly associated with late stage (mRNA: P=0.001, protein: P=0.05) and poor survival in lung adenocarcinoma (P=0.049). Conclusions: The results revealed the roles of overexpressed PAFAH1B1 in tumor progression and poor survival in lung cancer. Key words: PAFAH1B1, lung cancer, progression, oncogene Introduction that PA FA H1 B 1 is a potential oncogene in lung cancer. Genomic DNA copy number variation is a The PA FA H1 B 1 (also named LIS1) gene was hallmark of cancer and can lead to alteration in first cloned in patients with Miller-Dieker expression and functions of genes residing within lissencephaly syndrome (MDLS), a disorder of the affected chromosomal region (Davies et al., neural development characterized by agyria and 2005; Schwab, 1999). In our previous study, we facial abnormalities, and classic lissencephaly (type generated a non-gapped array-comparative genomic I, LIS1), a disorder of isolated agyria (Ledbetter et hybridization (array-CGH) microarray representing al., 1992). PA FA H1 B 1 is composed 11 exons (Fig. 18 human chromosome imbalance hotspot regions. 1A) and encodes the 45K non-catalytic subunit of Our study involved a large cohort of cancer patients the brain isoform of platelet activating factor (PAF) including 40 Asian and 20 Caucasian lung cancer acetylhydrolase, a PAF-inactivating enzyme patients, and revealed one of the novel lung (Hattori et al., 1994; Lo Nigro et al., 1997). cancer-related genes, PA FA H 1 B 1 , which was PAFAH1B1 is a predicted microtubule-associated amplified in both Asian and Caucasian lung cancer protein with N-terminal coiled-coil domain, one patients (GEO: GSE21276). The results suggested Lissencephaly type-1-like homology (LisH) motif *Corresponding author: Yi-Ching Wang; FAX: 886-6-2749296; E-mail: [email protected] Guey-Jen Lee-Chen; FAX: 886-2-29312904; E-mail: [email protected] Tsu-Wei Wang; FAX: 886-2-29312904; E-mail: [email protected] Fang-Yi Lo, Hsiung-Ting Chen, Han-Shui Hsu, Tsu-Wei Wang, Guey-Jen Lee-Chen, Yi-Ching Wang Figure 1. Schematic representation of PAFAH1B1 gene structure and predicted protein domain (not drawn to scale). (A) Exons are depicted as boxes and numbered with Roman numerals. Filled-in regions indicate translated portions of the gene. This schematic representation was modified from Lo Nigro et al (1997). (B) The SMART diagram of the predicted protein domains. PAFAH1B1 protein was predicted to contain one LisH domain, one coiled-coil domain, and eight repeat WD40 domains. domain and eight WD40-repeat domains (Fig. 1B). TRIzol reagent (Invitrogen, Carlsbad, CA). cDNA It was reported that PAFAH1B1 may enhance was generated using SuperScript reverse neuronal migration by acting as a transcriptase (Invitrogen). microtubule-associated protein (Cardoso et al., 2000). PAFAH1B1 was suggested to play some Quantitative reverse transcription polymerase roles in invasion of human neuroblastoma (Messi et chain reaction (qRT-PCR) al., 2008; Suzuki et al., 2007). qRT-PCR was used to measure the mRNA Here, we sought to extend our previous finding expression of four candidate genes in 91 NSCLC that PAFAH1B1 was amplified in lung cancer tumor and the corresponding normal samples. patients by evaluating the mRNA and protein qRT-PCR was conducted using the ABI 7900 expression level of PAFAH1B1 in 91 lung cancer Sequence Detection System (PE Applied patients. In addition, the roles of PAFAH1B1 in Biosystems). Total RNA (4 μg) from tumors and the tumor progression and poor survival in lung cancer corresponding normal tissues were reverse were examined. transcribed into cDNA and amplified using the SYBR Green PCR Master Mix (Roche) and specific Materials and methods primers for each candidate genes. The primer sequences for PA FA H1 B 1 are: forward ATG GGT Clinical samples preparation and DNA/RNA CGT AGC AAC AAA GG and reverse TCT TCA extraction TGC ATC GCT TGT TC. The annealing Tissues were collected after obtaining temperature was 58oC. The relative amount of appropriate institutional review board permission PA FA H1 B 1 amplification products was calculated and informed consent from the recruited patients. using the standard curve-based method and then Surgically resected tumor tissue and corresponding normalized to the relative amount of ß-actin as normal tissue were collected from 91 patients detected in the same run. The primer sequences for diagnosed with primary non-small cell lung cancer ß-actin are: forward GGC GGC ACC ACC ATG (NSCLC) admitted to Taipei Veterans General TAC CCT and reverse AGG GGC CGG ACT CGT Hospital, Taiwan. Histological classification was CAT ACT. The annealing temperature was 58 oC. determined according to the WHO classification Cutoff value for overexpression was the mean of system and the tumor-node-metastasis system. normal lung tissue expression. Information on the age, sex, tumor type, tumor stage and smoking history of the patients was Immunohistochemistry (IHC) obtained from hospital records. Total RNA from The protein expression level of PAFAH1B1 tumors and normal lung tissues was prepared using was evaluated by IHC in 91 NSCLC samples. 64 PAFAH1B1 Is a Metastasis-related Gene in Lung Cancer Paraffin blocks of tumors were cut into 5-μm slices and then processed using standard deparaffinization and rehydration techniques. Polyclonal antibody against PAFAH1B1 (1:800; Novus, Littleton, CO) was used as the primary antibody to detect the protein expression. The evaluation of the IHC was conducted blindly without knowledge of the clinical and pathologic characteristics of the cases. The samples were graded high expression when >50% tumor cells were stained positive using adequate staining in surrounding normal stromal and epithelial cells. Figure 2. The mRNA expression level of PAFAH1B1 in lung cancer. qRT-PCR was performed in normal and Statistical analysis tumor tissues from 91 lung cancer patients. The Y-axis is A two-tailed t test was used to determine the the mean mRNA expression ratio between candidate statistical significance of difference in mRNA gene and the internal control gene in all samples expression level of PA FA H1 B 1 in clinical samples. analyzed. The P values of comparison between normal Chi-square test was conducted to examine the (N) and tumor (T) samples for PAFAH1B1 mRNA association between overexpression of candidate expression is <0.0001 labeled with asterisk (***). genes and clinico-pathological parameters, Table 1. Association between mRNA expression level of including sex, age, tumor type, tumor stage, and PAFAH1B1 and lung cancer clinicopathological smoking. Survival curves were calculated according parameter. * to the Kaplan-Meier method, and comparison was performed using the log-rank test. A P < 0.05 was PAFAH1B1 mRNA considered to be statistically significant. Characteristics Total † Over-expression Normal n n (%) n (%) Results Overall 91 56 (61.5) 35 (38.5) PAFAH1B1 mRNA is overexpressed in lung cancer, Age ＜65 35 23 (65.7) 12 (34.3) and is significantly associated with late stage lung ≧65 56 33 (58.9) 23 (41.1) cancer patients. Sex Male 58 35 (60.3) 23 (39.7) To determine the mRNA expression level of Female 33 21 (63.6) 12 (36.4) the PAFAH1B1 gene in lung cancer, qRT-PCR of PA FA H1 B 1 was conducted with cDNA from tumors Smoker Yes 33 21 (63.3) 12 (36.4) No 29 16 (55.2) 13 (44.8) and corresponding normal tissues of 91 lung cancer Tumor type patients. The mean mRNA expression level of ADC 58 32 (55.2) 26 (44.8) PAFAH1B1 analyzed in the tumor tissues was SCC 31 22 (71) 9 (29) significantly higher than in the corresponding Tumor stage I + II 54 29 (53.7) 25 (46.3) normal tissues in lung cancer patients (P < 0.001) III + IV 35 26 (74.3)0.05 9 (25.7) (Fig. 2). The PA FA H1 B 1 mRNA overexpression * The P values with significance are shown as was defined using the mean mRNA expression of superscripts. normal lung tissue as a cutoff value. The † Total number of samples in some categories is less PAFAH1B1 mRNA overexpression frequency was than the overall number analyzed because clinical 61.5% (Table 1). To determine the statistical data or molecular data was not available for these significance of difference in mRNA expression samples. level of PA FA H1 B 1 in clinical samples. Chi-square test was conducted to examine the association significant correlation of PA FA H1 B 1 mRNA between mRNA overexpression of PAFA H1 B 1 and expressions was detected in these clinico- clinico-pathological parameters of 91 lung cancer pathological parameter, except that PAFAH1B1 patients, including age, sex, smoking, tumor type, mRNA overexpression was significantly associated and tumor stage.
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