Lncrna DNAJC3-AS1 Functions As Oncogene in Renal Cell Carcinoma Via Regulation of the Mir-27A-3P/PRDM14 Axis
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European Review for Medical and Pharmacological Sciences 2021; 25: 1291-1301 LncRNA DNAJC3-AS1 functions as oncogene in renal cell carcinoma via regulation of the miR-27a-3p/PRDM14 axis X.-Y. NA, X.-Q. HU, Y. ZHAO, C.-H. HU, X.-S. SHANG Department of Neurology, People’s Hospital of Zhenhai District, Ningbo, China (testis-associated highly conserved oncogenic long Abstract. – OBJECTIVE: Renal cell carcino- ma (RCC) is one of the most common urologi- non-coding RNA); DNAJC3-AS1 (DNAJ/HSP40 homo- cal malignancies worldwide. Although great ad- log, subfamily C, member 3, anti-sense 1); RPDM14 vances have been made in the diagnosis and (PR domain-containing membrane 14); SNHG12 (small management of RCC, its prognosis remains un- nucleolar RNA host gene 12); CCK-8 (Cell Count Kit- satisfactory. Long noncoding RNAs (lncRNAs) 8) ZEB1-AS1 (zinc-finger E-box binding homeobox 1, have been found to be essential factors in the anti-sense 1); FBS (Fetal Bovine Serum); DMEM (Dul- initiation and development of cancer. The cur- becco’s Modified Eagle’s Medium); DEVD-pNA (Asp- rent study aimed to measure the expression and Glu-Val-Asp-chromophore p-nitroanilide); ELISA (en- functions of lncRNA DNAJC3-AS1 in the pro- zyme-linked immunosorbent assay); SDS-PAGE (sodi- gression of clear cell RCC (ccRCC). um dodecyl sulfate-polyacrylamide gel electrophoresis); PATIENTS AND METHODS: The expression RIPA buffer (Radio-Immunoprecipitation assay buffer); of lncRNA DNAJC3-AS1 was detected in 30 PVDF (Polyvinylidene fluoride). pairs of ccRCC tissues and in cell lines by RT- PCR, and its prognostic association with ccRCC was evaluated by the Kaplan-Meier method. The proliferation, migration, invasion and apopto- Introduction sis of ccRCC cells were measured after silenc- ing DNAJC3-AS1. The interaction between DNA- Renal cell carcinoma (RCC) is a common kid- JC3-AS1, miR-27a-3p and PRDM14 was identi- ney carcinoma that accounts for 80-90% of adult fied by Dual-Luciferase reporter assay. The pro- 1 tein levels were measured by Western blotting. renal malignant tumors . Worldwide, approxima- RESULTS: The expression of DNAJC3-AS1 tely 270,000 new cases of RCC are diagnosed and was upregulated in ccRCC tissues and cell lines over ten thousand RCC patients die each year2. compared to their normal counterparts. In vi- Clear cell RCC (ccRCC) accounts for approxi- tro, silencing DNAJC3-AS1 reduced the prolif- mately 90% of all RCCs in terms of histological eration, migration and invasion of ccRCC cells. subtype; therefore, it is one of the most lethal Downregulation of DNAJC3-AS1 also led to the apoptosis of ccRCC cells. Moreover, we also urological malignancies. Currently, the diagnosis found that DNAJC3-AS1 acted as a sponge of of ccRCC primarily depends on computed tomo- miR-27a-3p and identified PRDM14 as a target of graphy scans and magnetic resonance imaging. miR-27a-3p. Because RCC is insensitive to radiotherapy or CONCLUSIONS: LncRNA DNAJC3-AS1 acts chemotherapy, the treatment of early RCC mainly as an oncogene and plays an essential role in relies on surgery. Although the treatment of RCC the tumorigenesis of ccRCC, possibly via the has greatly improved in the last two decades, the regulation of the miR-27a-3p/PRDM14 axis. prognosis of RCC remains poor. Moreover, there Key Words: is still a lack of effective biomarkers for predi- Renal cell carcinoma, LncRNA DNAJC3-AS1, MiR- cting clinical progression and outcome in ccRCC 27a-3p, PRDM14. patients. Thus, it is urgent to identify effective biomarkers and unveil the molecular mechanisms of ccRCC progression. Abbreviations In recent years, long noncoding RNA (lncR- RCC (renal cell carcinoma); ccRCC (clear cell renal NA), which was initially considered the “junk” of cell carcinoma); RT-PCR (real-time reverse transcrip- the genome, has been found to play an essential tion PCR); lncRNA (long non coding RNA); THOR role in various biological activities3. Some stu- Corresponding Author: Shang Xiaosong, MD; e-mail: [email protected] 1291 X.-Y. Na, X.-Q. Hu, Y. Zhao, C.-H. Hu, X.-S. Shang dies4-6 have shown that lncRNAs are associated obtained from all patients. The Ethics Commit- with the development of various cancers, such as tee of the hospital reviewed and approved this lung cancer, breast cancer, colorectal cancer and study. gastric cancer. It has been reported that various lncRNAs are involved in the tumorigenesis of Cell Culture and Transfection RCC. For instance, lncRNA THOR is upregu- ccRCC cell lines (769-P, ACHN, Caki-1, 786- lated in RCC tissues and cell lines. Silencing of O) and a normal renal proximal tubular epithelial THOR inhibited the growth, migration and inva- cell line (HK-2) were purchased from Shanghai sion of RCC cells7. LncRNA SNHG12 was also Bank of Cells (Shanghai, China). Cells were cul- overexpressed in ccRCC tissues and cell lines. tured in DMEM (HyClone, South-Logan, UT, Inhibition of SNHG12 repressed the viability and USA) supplemented with 10% FBS (fetal bovine mobility of ccRCC cells8. serum, penicillin; 100 U/ml) and streptomycin Notably, antisense partners of protein-coding (100 μg/mL; Gibco, Carlsbad, CA, USA). All cel- genes are one type of lncRNA; these include ls were cultured in a humidified atmosphere of 9-11 DLX6-AS1, ZEB1-AS1 and TP73-AS1 . LncR- 5% CO2 at 37°C. The siRNAs for DNAJC3-AS1 NA DNAJC3-AS1 is a relatively novel lncRNA (si-DNAJC3-AS1 #1, si-DNAJC3-AS1 #2, si-D- that is located on chromosome 13q32.1 and has NAJC3-AS1 #3) and PRDM14 (si-PRDM14), and 2 exons. DNAJC3, also known as P58, belongs miR-27a-3p mimics, miR-27a-3p inhibitors, con- to the heat shock protein family, which is a very trol siRNA (si-NC), and miR-NC mimics were conserved protein that is widely expressed in hu- synthesized by GenePharma Ltd (Suzhou, Chi- man and animal cells12. It is well documented that na). The coding region of PRDM14 was ampli- DNAJC3 can provide protective effects against fied from cDNA and cloned into pcDNA3.1 (pc- various kinds of damage in cells12,13. Howe- DNA3.1 PRDM14). Transfection was performed ver, there is little investigation about the role of using Lipofectamine 3000 (Life Technologies, DNAJC3-AS1 in ccRCC. Carlsbad, CA, USA) according to the manufactu- In the present study, the correlation between rer’s instructions. DNAJC3-AS1 and clinical data in RCC patients was investigated. Furthermore, we studied the in Cell Proliferation Assay vitro effects of DNAJC3-AS1 on ccRCC cells and The proliferation of cells was measured by the elucidated its underlying mechanisms. Cell Counting Kit-8 (CCK-8; Solarbio, Beijing, China) assay according to the manufacturer’s in- structions. Briefly, cells were plated in 96-well Patients and Methods culture plates at a density of 1 ×104 cells/well and cultured in fresh medium mixed with CCK-8 at a Patients and Tissues Collection ratio of 10:1 for 2 h. The cell density was measu- In total, 30 pairs of ccRCC and adjacent nor- red with a microplate reader (Biotek, Winooski, mal tissues were collected during nephrectomy VT, USA) at 490 nm. of ccRCC patients who did not receive any preo- perative treatment at the hospital. The inclusion RNA Purification and RT-PCR criteria were as follows: no history of other ma- RNA was extracted from cells or tissues using lignant tumors, no history of anticancer therapy, TRIzol (Life Technologies, Carlsbad, CA, USA). pathologically proven ccRCC and radical or par- The concentration and quality of RNA were as- tial nephrectomy as the treatment. The exclusion sayed using a NanoDrop 2000 Spectrophotometer criteria were as follows: mixed histological type (Thermo Scientific, Waltham, MA, USA). One of primary renal cancer, larger area of necro- microgram of total RNA was reverse transcribed sis and hemorrhage influencing the collection into cDNA using the High Capacity cDNA Rever- of representative area in samples, and death of se Transcriptase Kit (Life Technologies, Carlsbad, the patient within the first month after surgery. CA, USA). qRT-PCR was carried out using SYBR The diagnosis was histologically and pathologi- GreenTM qPCR SuperMix Universal (Life Techno- cally confirmed by 2 experienced pathologists. logies, Carlsbad, CA, USA) on an Applied Biosy- All tumors were staged according to the AJCC stems 7500 Detection System (Applied Biosystems, 7th system14. All samples were instantly frozen Foster City, CA, USA) to measure the expres- in liquid nitrogen after resection and then main- sion of DNAJC3-AS1, miR-27a-3p, PRDM14, U6 tained in storage. Written informed consent was and GAPDH. The following primers were used: 1292 LncRNA DNAJC3-AS1 functions as oncogene in RCC via regulation of the miR-27a-3p/PRDM14 axis DNAJC3-AS1 forward: 5′-AGCGATTGTG- for caspase-3 activity was performed in a 96-well GAAGACCCTG-3′ and reverse: 5′-ATTTCCC- plate. After transfection for 24 h, cells were col- CTGGTAAGCGCAA-3′; miR-27a-3p forward: lected and lysed. Fifty microliters of lysates were 5′-TTCACAGTGGCTAAGTTCCGC-3′ and 5′- added into each well. A 50 μl aliquot of 2× re- AGGG CTTAGCTGCTTGTGAGCA-3′; PRDM14 action buffer was added to each sample. Then, forward: 5’-TGAGCCTTCAGGTCACAGAG-3’ 200 μM DEVD-pNA was added as the caspase-3 and reverse 5’-ATTTCCTATCGCCCTTGTCC-3’; substrate. The reaction mixtures were mixed and U6 forward: 5′-CTCGCTTCGGCAGCACA-3′ and incubated at 37°C for 2 h. Then, the absorbance reverse 5′-AACGCTTCACGAATTTGCGT-3′; was measured by a microplate reader (Biotek, and GAPDH forward: 5′-GGTGAAGGTCGGA- Winooski, VT, USA) at 405 nm. GTCAACG-3′ and reverse: 5′-CAAAGTTGTCA- TGGATGTACC-3′. The PCR conditions were as Apoptosis Assay follows: 95°C for 10 min, 40 cycles of 95°C for 15 The apoptosis of cells was performed with s, and 60°C for 60 s.