Clinical significance of HDAC1, -2 and -3 expression levels in esophageal squamous cell carcinoma
- Authors:
- Published online on: April 29, 2020 https://doi.org/10.3892/etm.2020.8697
- Pages: 315-324
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Copyright: © Li et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
Abstract
Introduction
Esophageal cancer is the sixth leading cause of cancer-related mortality. It caused the mortality of 440,000 people in 2013(1). It is the third deadliest cancer in Chinese males and the fifth deadliest malignance in Chinese females (2). In China and other Asian countries, 95% of the esophageal cancer is esophageal squamous cell carcinoma (ESCC) and the 5-year overall survival rate is ~10-20% (3). Therefore, it is important to identify the tumor-specific markers in ESCC (4).
Histone deacetylases (HDACs) are expressed in plants, animals, fungi, archaebacteria and eubacteria (5). HDACs are classified into Class I, II and IV or Class III (coenzyme-nicotinamide adenine dinucleotide). HDAC1, -2, -3 and -8 belong to Class I (6). HDACs together with histone acetylases can regulate gene transcription and carcinogenesis by modulating chromatin structure (7). Class I HDACs have been shown to be widely expressed in all kinds of solid cancers (8,9). HDAC1 expression in ESCC is higher compared with normal esophageal mucosa. When cancer cells invade the deep layer of the esophageal wall, the expression of HDAC 1 is significantly decreased compared with normal control samples (10). Nevertheless, the expression and role of HDAC2 and 3 in ESCC remain to be elucidated.
The relationship between histone deacetylation and cellular events, including cell proliferation, differentiation and cell cycle regulation has been demonstrated (11-13). For example, HDACs may inhibit target gene expression by binding to the transcriptional cofactor PC3/Tis21, thereby inhibiting cell proliferation (14). HDAC2 overexpression enhances the aggressiveness of gastric carcinoma cells and HDAC2 inhibition attenuates the carcinogenic potential of gastric carcinoma cells in xenotransplanted nude mice (13). In addition, several studies have shown that HDAC3 is over-expressed in various solid tumors and is closely associated with poor prognosis (14-16).
The present study investigated the expression levels of HDAC1, -2 and -3 and their clinical significance in ESCC. The association of HDAC1, -2 and -3 with clinicopathological characteristics of ESCC was also analyzed.
Materials and methods
Patient information and tissue specimens
Primary ESCC tissues and paired distal normal tissues (>5 cm away from the margin of tumor tissue) were collected from 88 patients (Kazak, n=40; Han, n=44). Esophagus excision was performed between December 2009 and September 2015 at the Xinjiang Medical University Affiliated Cancer Hospital. No patient received preoperative chemotherapy or radiotherapy. ESCC diagnosis was confirmed by pathology. Patient characteristics including sex, age, lymph node (LN) metastasis, differentiation and depth of invasion were recorded (Table I). The present study research was approved by the Ethics Committee of Xinjiang Medical University and all patients provided written informed consent.
Reverse transcription semi-quantified PCR
Total RNA was extracted with TRIzol (Invitrogen, Thermo Fisher Scientific, Inc.) from ESCC tissues and paired distal normal tissues. Reverse transcription of RNA was performed with avian myeloblastosis virus reverse transcriptase (Promega Corporation). Reverse transcription was performed under the following heat conditions: 55˚C for 90 min and 4˚C for 10 min. The cDNA products were identified on a 2% agarose gel with ethidium bromide. The PCR reaction system included 2 µl reverse-transcribed cDNA, 10 µl 2XPCR master mix, 1 µl of each primer (10 µM) and 6 µl ddH2O (Ready-to-Use PCR kit, Beijing Transgen Biotech Co., Ltd.). Amplification was performed on an iCycler™ Thermal Cycler (Bio-Rad Laboratories, Inc.). GAPDH was an internal control.
The PCR primers were: HDAC1 forward, 5'-AGTGCGGTGGTCTTACAGTG-3', HDAC1 reverse, 5'-TCTCCCTCCTCTTCAGAATCG-3', HDAC2 forward, 5'-GCTGGTCTTGAACTCCTT-3', HDAC2 reverse, 5'-TACAACCCATCTGGCATC-3', HDAC3 forward, 5'-GGGACATTATTGGCAGTG-3', HDAC3 reverse, 5'-GGATTCAGGTGTTAGGGAG-3', GAPDH forward, 5'-GCGGGCTCTCCAGAACATCAT-3' and GAPDH reverse, 5'-CCAGCCCCAGCGTCAAAGGTG-3'. The thermocyling conditions were as follows: Initial denaturation at 95˚C for 5 min; 35 cycles of 95˚C for 30 sec, 58˚C for 20 sec for HDAC1. 54˚C for 20 sec for HDAC2, 58˚C for 30 sec for HDAC3 and 60˚C for 30 sec for GAPDH, 72˚C for 30s; and a final extension at 72˚C for 7 min. The PCR products were identified on a 1.5% agarose gel with ethidium bromide and analyzed with the Gel Doc XR System (Bio-Rad Laboratories, Inc.). The DNA ladder maker was purchased from Sangon Biotech Co., Ltd. The intensities of PCR product bands were quantified using Quantity One software version 4.5.2 (Bio-Rad Laboratories, Inc.). The quantity of each PCR product band was standardized to that of GAPDH. The presence or absence of bands was considered positive or negative. Grey scale ratio >2 was defined as high expression.
Statistical analysis
SPSS 17.0 software (SPSS Inc.) was used for data analysis. Experiments were performed in triplicate. Measurement data were presented as the mean ± SD. Count data were expressed as the number (%). Correlations among HDAC1, -2 and -3 expression were analyzed by the Pearson correlation test. Differences in gene expression were analyzed using a paired t-test and variances in clinicopathologic features were analyzed using χ2 test. P<0.05 was considered to indicate a statistically significant difference.
Results
Patient characteristics
First, the basic information of the patients was investigated (Table I). Of the 88 patients, 26 (29.5%) were women and 62 (70.5%) were men. Their mean age was 58.2 years, 37-84 years old. The most common tumor location was at the middle and lower esophagus (95.5%). There were 69 ESCC cases with moderate to high differentiation and 19 with poor differentiation. A total of 46 cases had LN metastasis and 42 did not have LN metastasis. There were 13 cases of T1+T2 and 75 cases of T3+T4.
Expression levels of HDAC1, -2 and -3 in human ESCC and distal normal tissues
To compare the expression levels of HDAC1, -2 and -3 in tumor issues and distal normal tissues, reverse transcription semi-quantified PCR analysis was performed. The representative amplification results of HDAC1, -2 and -3 are presented in Fig. 1A. It demonstrated that HDAC1 was 510 bp in length, HDAC2 was 187 bp, HDAC3 was 233 bp and GAPDH was 309 bp (Fig. 1A). Following quantification, expression of HDAC1, -2 and -3 mRNA was elevated in tumor tissues compared with distal normal tissue, although no significant difference was observed (Fig. 1B). The HDAC1 mRNAs were positive in 48.9% (43/88) of the tumor tissues, HDAC2 mRNAs were positive in 77.3 (68/88) of the tumor tissues and HDAC3 mRNAs were positive in 93.2% (82/88) of the tumor tissues. Their positive rate in distal normal tissues was 31.8% (28/88), 85.2% (75/88) and 87.5% (77/88), respectively. The expression of HDAC1, but not HDAC2 or HDAC3, was higher in ESCC samples than in distal normal samples (P<0.05; Table II). The expression of HDAC1, -2 and -3 in patients of different ethnicities was also analyzed. As shown in Table III, the expression of HDAC1 in tumor tissue and normal tissue of Kazak people was lower compared with Han people (P<0.05). The expression of HDAC2 in normal tissue of Kazak people was decreased compared with that in Han people. The expression of HDAC3 in tumor tissue of Kazak people was decreased compared with that in Han people (P<0.05).
Table IIIExpression of HDAC1, HDAC2 and HDAC3 mRNA in tumor and normal tissue of Han and Kazak people. |
Relationship of HDAC1, -2 and -3 expression with clinicopathological characteristics
Next the relationship of HDAC1, -2 and -3 expression with the clinicopathological characteristics of ESCC patients was detected. No significant differences were found in correlation analysis between HDAC1 expression and clinicopathological indexes (Table IV). The expression of HDAC2 was significantly related with invasion depth (P<0.05; Table V). However, there were no significant correlation between HDAC2 and age, sex, depth of invasion and tumor differentiation. Moreover, no significant differences were found between HDAC3 expression and clinicopathological indexes (Table VI). For the Kazak and Han ethnicities, the expression of HDAC1 in male patients, patients with well and moderate differentiated ESCC and T3 and T4 ESCC were significantly related with ethnicity (P<0.01; Table VII). The expression of HDAC1 in patients less than 60 years old was related with ethnicity (P<0.05; Table VII). The expression of HDAC2 in positive LN metastasis, well and moderate differentiation and T3 and T4 stages were significantly related with ethnicity (P<0.01; Table VIII). The expression of HDAC2 in female patients and negative LN metastasis were related with ethnicity (P<0.05; Table VIII). The expression of HDAC3 in male, negative LN metastasis and well and moderate differentiation was related with ethnicity (P<0.05; Table IX).
Table IVCorrelation of HDAC1 expression with clinicopathologic characteristics of esophageal squamous cell carcinoma patients (n=88). |
Table VCorrelation of HDAC2 expression with clinicopathologic characteristics of esophageal squamous cell carcinoma patients (n=88). |
Table VICorrelation of HDAC3 expression with clinicopathologic characteristics of esophageal squamous cell carcinoma patients (n=88). |
Table VIICorrelation of HDAC1 expression with clinicopathologic characteristics of esophageal squamous cell carcinoma in Han and Kazak patients (n=88). |
Table VIIICorrelation of HDAC2 expression with clinicopathologic characteristics of esophageal squamous cell carcinoma in Han and Kazaks patients (n=88). |
Table IXCorrelation of HDA3 expressions with clinicopathologic characteristics of esophageal squamous cell carcinoma in Han and Kazak patients (n=88). |
Correlation among HDAC1, -2 and -3 expression in human ESCC tissues
The correlation among HDAC1, -2 and -3 was obtained by using Pearson's correlation test. The result showed that there were no significant correlations between HDAC1 and HDAC2 (r=-0.042, P=0.694), HDAC1 and HDAC3 (r=-0.084, P=0.430), or HDAC2 and HDAC3 (r=-0.176, P=0.099) in ESCC tissues (Fig. 2). These results indicated that there was no correlation among the three HDACs.
Discussion
ESCC is a common malignant cancer, which can easily invade adjacent areas and metastasize to lymph nodes and distant tissues (15,16). It has a high degree of prevalence and a low survival rate. Thus, it is urgent to develop molecular markers that can facilitate the early detection of ESCC.
HDAC1 contains 482 amino acids, identified in 1996 by Taunton et al (17). HDAC1 regulates genes involved in cell differentiation and the cell cycle, and participates in the development of various diseases such as viral infectious diseases, degenerative diseases and cancer (18-20). HDAC1 can mediate site-specific DNA-binding transcriptional repression and a high level of HDAC1 is observed in tumor invasion and metastasis (21). Burdelski et al (22) identified that a high level of HDAC1 was associated with high Gleason grade, advanced pathological tumor stage, positive LN metastasis, elevated preoperative prostate specific antigen level and cell proliferation; therefore, HDAC1 expression detection may have clinical significance for the risk stratification of prostate cancer. Huang et al (23), demonstrated high expression of HDACs in cervical cancer and cervical intraepithelial neoplasia tissues. Mutze et al (24), identified high levels of HDAC1 and HDAC2 in gastric carcinomas and they were not related to the response to platinum/5-fluorouracil. High HDAC1 level is related to lower overall survival (25). There is a significant association between HDAC1 high expression and advanced age (26). High levels of HDAC1 expression are associated with a poor histological differentiation and prognosis in liver cell carcinoma (27). There is higher expression of HDAC1 in gastrointestinal malignant tumor, particularly in colorectal cancer and HDAC1 expression is closely related to clinical characteristics of gastrointestinal cancer (8). Zhong et al (28), noted that the high expression of HDAC1 may serve as a potential therapeutic target for ESCC. Miyashita et al (29), reported that the expression of HDAC1 may be involved in duodenoesophageal reflux-induced neoplastic transformation of the esophageal mucosa into cancer cells with squamous and adeno differentiation. By contrast, Langer et al (30) stated HDAC1 expression is not changed based on pT, pN category or esophageal adenocarcinoma differentiation level. Xu et al (31), noted that HERG1 contributes to poor prognosis of ESCC and suggest that targeting HERG1 may have potential diagnostic and therapeutic value for ESCC treatment. In the present study, the positive rate of HDAC1 expression in ESCC was increased compared with normal tissues. However, the expression did not change according to sex, age, metastasis, differentiation degree and invasion depth.
HDAC2 can promote tumorigenesis through several mechanisms, including promoting the degradation of β-catenin and decreasing epigenetic modification (15,32). In addition, HDAC2 can inhibit the expression of tumor suppressor p53 and p21 while promoting expression of oncogene Myc (33,34). HDAC2 participates in chronic obstructive pulmonary disease (35,36). It is also over expressed in lung cancer (37-39). Huang et al (40), demonstrated that HDAC2 affects chromatin remodeling following DNA damage in ovarian cancer cells. It is also reported that high HDAC2 expression indicates high aggressive behavior in esophageal adenocarcinoma (30). Wang et al (41), noted that the level of HDAC2 increases dramatically in ESCC compared with adjacent non-tumor tissues. Li et al (42) reported that the HDAC2 protein level in ESCC tissues was significantly increased and was closely associated with the histological grade, invasion depth and lymph node metastasis. Göder et al (43) noted that HDAC1 and HDAC2 regulate checkpoint kinase phosphorylation through suppression of PR130. HDACi, as well as an elimination of HDAC1/HDAC2, induces PR130-dependent mechanisms that inhibit checkpoint kinase phosphorylation. However, the present study failed to detect notable changes in HDAC2 expression between ESCC and normal tissues. However, the expression of HDAC2 was related to the invasion depth.
HDAC3 is also an essential factor for cell survival and proliferation in tumors and in maintaining the structure of chromatin and the stability of genome (44). HDAC3 can form large corepressor complexes with N-CoR and SMRT (45). High HDAC3 expression has been found in colon or gastric tumor cells and it has an antiapoptotic function (46,47). High expression of HDAC3 is also noted in gastric cancer, where it is associated with poor prognosis (14). HDAC3 stimulates cell migration of ovarian carcinoma and high HDAC3 expression indicates poor prognosis of lung adenocarcinoma patients (48,49). Jiao et al (50) found that increased HDAC3 level in the nucleus, but not in the cytoplasm, was related with LN metastasis and advanced clinical staging of pancreatic cancer. It has also been reported that HDAC3 is a risk factor of ESCC and may be used to evaluate the grade of malignancy and prognosis of ESCC (51). The present study found no significant difference in the expression of HDAC3 in ESCC tissue compared with normal tissue and identified that the expression of HDAC3 was not associated with sex, age, metastasis, degree of esophageal tissue differentiation or the depth of invasion. It was hypothesized that perhaps regional differences and ethnic specificity lead to the discrepancy between the present results and a previous study (51). These results indicate that the expression of HDAC3 has no relationship with the development of ESCC.
Additionally, the present study found that the expression of HDACs in tumor tissue from Kazak people was lower compared with Han people. In ESCC, the positive rate of HDAC1 expression in ESCC tissues was increased compared with normal tissue. The expression of HDAC2 varied according to the invasion depth of ESCC patients. However, HDAC3 showed no significant expression changes in ESCC and was not correlated with the clinicopathological characteristics of ESCC patients. The expression of HDACs in tumor tissue of Kazak people was lower compared with Han people. Additionally, it was noted that the expression of HDAC1, -2 and -3 had ethnic differences.
As for treatment, Ahrens et al (52) proposed that targeting epigenetic modifiers in esophageal cancers may represent a potential future therapeutic approach. Kano et al (53) found that CHAP31 sensitized SCC cells to carbon-ion radiotherapy and this combination treatment may be a potentially useful therapeutic strategy for ESCC. Hoshino et al (54) suggested that HDACi-FK228 has a potent ability to augment the effect of adenovirus-mediated p53 gene therapy in ESCC. Thus, targeting HDACs may be an effective approach for treatment of ESCC.
In summary, HDAC1 may be used as a risk factor for ESCC and HDAC2 may be used to predict ESCC invasion. The different clinical parameter expression is related to ethnic differences. Future research should focus on the effect of HDAC inhibitors on ESCC treatment in Xinjiang, China.
Acknowledgements
Not applicable.
Funding
The present study was supported by the Nature Science Foundation of China (grant nos. 81460419 and 81460359).
Availability of data and materials
All data generated or analyzed during the present study are included in this published article.
Authors' contributions
LL designed the study. HuiwL, HuiL and YW performed data collection. HuiwL and HuiL performed statistical analysis. HuiwL provided data interpretation. YinL and YikL participated in data collection of patient information. YC and LY provided help in RT-qPCR assay. All authors read and approved the final manuscript.
Ethics approval and consent to participate
This study was approved by the Ethics Committee of the Xinjiang Medical University and informed consent was obtained from all patients.
Patient consent for publication
Not applicable.
Competing interests
All authors declare that they have no competing interests.
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