Abstract
Radiotherapy is instrumental in the treatment of inoperable non-small cell lung cancer (NSCLC). Studies have revealed that radiotherapy induces endoplasmic reticulum (ER) stress, which consequently induces apoptosis and sensitization of cancer cells. A recent study has revealed that long non-coding RNA (lncRNA) CASC2 is negatively correlated with the malignancy of NSCLC cells. The present study investigated the effects and molecular mechanisms of CASC2 on radiosensitivity and ER stress in NSCLC cells. The overexpression of CASC2 markedly decreased cell survival and increased apoptosis, expression of PERK, phosphorylated-eIF2α and CHOP in irradiated human NSCLC cells, whereas knocking down PERK reversed these effects. Moreover, CASC2 considerably promoted the stability of PERK mRNA, but had no effect on the activity of PERK gene promoter in irradiated NSCLC cells. Strikingly, CASC2 exhibited no apparent effect on non-irradiated NSCLC cells. This study demonstrated that lncRNA CASC2 increases the stability of PERK mRNA, which consequently triggers the PERK/eIF2α/CHOP ER stress pathway and promotes radiosensitivity or apoptosis in irradiated NSCLC cells. Results of the present study suggest that CASC2 can act as an effective therapeutic target to enhance the efficacy of radiotherapy in the treatment of NSCLC.
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Baldinu P et al (2004) Identification of a novel candidate gene, CASC2, in a region of common allelic loss at chromosome 10q26 in human endometrial cancer. Hum Mutation 23:318–326. https://doi.org/10.1002/humu.20015
Banerjee S, Zhang W (2018) Endoplasmic reticulum: target for next-generation cancer therapy. ChemBioChem 19:2341–2343. https://doi.org/10.1002/cbic.201800461
Bodensohn R, Corradini S, Ganswindt U, Hofmaier J, Schnell O, Belka C, Niyazi M (2016) A prospective study on neurocognitive effects after primary radiotherapy in high-grade glioma patients. Int J Clin Oncol 21:642–650. https://doi.org/10.1007/s10147-015-0941-1
Bray F, Ferlay J, Soerjomataram I, Siegel RL, Torre LA, Jemal A (2018) Global cancer statistics 2018: GLOBOCAN estimates of incidence and mortality worldwide for 36 cancers in 185 countries. CA Cancer J Clin 68:394–424. https://doi.org/10.3322/caac.21492
Carter R et al (2016) Radiosensitisation of human colorectal cancer cells by ruthenium(II) arene anticancer complexes. Sci Rep 6:20596. https://doi.org/10.1038/srep20596
Clarke HJ, Chambers JE, Liniker E, Marciniak SJ (2014) Endoplasmic reticulum stress in malignancy. Cancer Cell 25:563–573. https://doi.org/10.1016/j.ccr.2014.03.015
Colombo N et al (2016) ESMO-ESGO-ESTRO Consensus Conference on Endometrial Cancer: diagnosis, treatment and follow-up. Ann Oncol 27:16–41. https://doi.org/10.1093/annonc/mdv484
Feng Y et al (2017) Modulation of CASC2/miR-21/PTEN pathway sensitizes cervical cancer to cisplatin. Arch Biochem Biophys 623–624:20–30. https://doi.org/10.1016/j.abb.2017.05.001
Gao W et al. (2019) Long non-coding RNA CASC2 regulates Sprouty2 via functioning as a competing endogenous RNA for miR-183 to modulate the sensitivity of prostate cancer cells to docetaxel. Arch Biochem Biophys 665:69–78. htttps://doi.org/10.1016/j.abb.2018.01.013
He X et al (2016) Low expression of long noncoding RNA CASC2 indicates a poor prognosis and regulates cell proliferation in non-small cell lung cancer. Tumour Biol 37:9503–9510. https://doi.org/10.1007/s13277-016-4787-6
Hetz C, Martinon F, Rodriguez D, Glimcher LH (2011) The unfolded protein response: integrating stress signals through the stress sensor IRE1alpha. Physiol Rev 91:1219–1243. https://doi.org/10.1152/physrev.00001.2011
Hu W, Alvarez-Dominguez JR, Lodish HF (2012) Regulation of mammalian cell differentiation by long non-coding RNAs. EMBO Rep 13:971–983. https://doi.org/10.1038/embor.2012.145
Jiang P, Chen A, Wu X, Zhou M, Ul Haq I, Mariyam Z, Feng Q (2018) NEAT1 acts as an inducer of cancer stem cell-like phenotypes in NSCLC by inhibiting EGCG-upregulated CTR1. J Cell Physiol 233:4852–4863. https://doi.org/10.1002/jcp.26288
Jin X et al (2018) CASC2/miR-24/miR-221 modulates the TRAIL resistance of hepatocellular carcinoma cell through caspase-8/caspase-3. Cell Death Dis 9:318. https://doi.org/10.1038/s41419-018-0350-2
Joo H et al (2016) c-Jun N-terminal kinase-dependent endoplasmic reticulum stress pathway is critically involved in arjunic acid induced apoptosis in non-small cell lung cancer. Cells Phytother Res (PTR) 30:596–603. Htttps://doi.org/10.1002/ptr.5563
Kapranov P et al (2007) RNA maps reveal new RNA classes and a possible function for pervasive transcription. Science 316:1484–1488. https://doi.org/10.1126/science.1138341
Koh PK, Faivre-Finn C, Blackhall FH, De Ruysscher D (2012) Targeted agents in non-small cell lung cancer (NSCLC): clinical developments and rationale for the combination with thoracic radiotherapy. Cancer Treat Rev 38:626–640. https://doi.org/10.1016/j.ctrv.2011.11.003
Li H et al (2018) Long non-coding RNA 1308 promotes cell invasion by regulating the miR-124/ADAM 15 axis in non-small-cell lung cancer cells. Cancer Manag Res 10:6599–6609. https://doi.org/10.2147/CMAR.S187973
Lin Y, Wang Y, Liu X, Yan J, Su L (2016) A novel derivative of tetrandrine (H1) induces endoplasmic reticulum stress-mediated apoptosis and prosurvival autophagy in human non-small cell lung cancer cells. Tumour Biol 37:10403–10413. https://doi.org/10.1007/s13277-016-4950-0
Liu X, Guo S, Su L (2015) Chaetocin induces endoplasmic reticulum stress response and leads to death receptor 5-dependent apoptosis in human non-small cell lung cancer cells. Apoptosis 20:1499–1507. https://doi.org/10.1007/s10495-015-1167-4
Livak KJ, Schmittgen TD (2001) Analysis of relative gene expression data using real-time quantitative PCR and the 2(-Delta Delta C(T)) method. Methods 25:402–408. https://doi.org/10.1006/meth.2001.1262
Lu W et al (2017) Long non-coding RNA linc00673 regulated non-small cell lung cancer proliferation, migration, invasion and epithelial mesenchymal transition by sponging miR-150-5p. Mol Cancer 16:118. https://doi.org/10.1186/s12943-017-0685-9
Ma L et al (2011) An integrated analysis of miRNA and mRNA expressions in non-small cell lung cancers. PLoS ONE 6:e26502. https://doi.org/10.1371/journal.pone.0026502
Miao WJ, Yuan DJ, Zhang GZ, Liu Q, Ma HM, Jin QQ (2019) lncRNA CASC2/miR18a5p axis regulates the malignant potential of nasopharyngeal carcinoma by targeting RBBP8. Oncol Rep 41:1797–1806. https://doi.org/10.3892/or.2018.6941
Nam SM, Jeon YJ (2019) Proteostasis in the endoplasmic reticulum: road to cure. Cancers 11. https://doi.org/10.3390/cancers11111793
Nishitoh H (2012) CHOP is a multifunctional transcription factor in the ER stress response. J Biochem 151:217–219. https://doi.org/10.1093/jb/mvr143
Ricciuti B, Mencaroni C, Paglialunga L, Paciullo F, Crino L, Chiari R, Metro G (2016) Long noncoding RNAs: new insights into non-small cell lung cancer biology, diagnosis and therapy. Med Oncol 33:18. https://doi.org/10.1007/s12032-016-0731-2
Saglar E, Unlu S, Babalioglu I, Gokce SC, Mergen H (2014) Assessment of ER stress and autophagy induced by ionizing radiation in both radiotherapy patients and ex vivo irradiated samples. J Biochem Mol Toxicol 28:413–417. https://doi.org/10.1002/jbt.21579
Shi X et al (2018) Long noncoding RNA PCAT6 functions as an oncogene by binding to EZH2 and suppressing LATS2 in non-small-cell lung cancer. EBioMedicine 37:177–187. https://doi.org/10.1016/j.ebiom.2018.10.004
Tang Y et al (2016) Radiation-induced miR-208a increases the proliferation and radioresistance by targeting p21 in human lung cancer cells. J Exp Clin Cancer Res (CR) 35:7. https://doi.org/10.1186/s13046-016-0285-3
Walter P, Ron D (2011) The unfolded protein response: from stress pathway to homeostatic regulation. Science 334:1081–1086. https://doi.org/10.1126/science.1209038
Wang P, Liu YH, Yao YL, Li Z, Li ZQ, Ma J, Xue YX (2015) Long non-coding RNA CASC2 suppresses malignancy in human gliomas by miR-21. Cell Signal 27:275–282. https://doi.org/10.1016/j.cellsig.2014.11.011
Wang Y et al (2017) Long non-coding RNA CASC2 suppresses epithelial-mesenchymal transition of hepatocellular carcinoma cells through CASC2/miR-367/FBXW7 axis. Mol Cancer 16:123. https://doi.org/10.1186/s12943-017-0702-z
Wang A et al (2019) Long noncoding RNA EGFR-AS1 promotes cell growth and metastasis via affecting HuR mediated mRNA stability of EGFR in renal cancer. Cell Death Dis 10:154. https://doi.org/10.1038/s41419-019-1331-9
Wu D, Li Y, Zhang H, Hu X (2017) Knockdown of Lncrna PVT1 enhances radiosensitivity in non-small cell lung cancer by sponging Mir-195. Cell Physiol Biochem 42:2453–2466. https://doi.org/10.1159/000480209
Yamamori T, Meike S, Nagane M, Yasui H, Inanami O (2013) ER stress suppresses DNA double-strand break repair and sensitizes tumor cells to ionizing radiation by stimulating proteasomal degradation of Rad51. FEBS Lett 587:3348–3353. https://doi.org/10.1016/j.febslet.2013.08.030
Yao RW, Wang Y, Chen LL (2019) Cellular functions of long noncoding RNAs. Nat Cell Biol 21:542–551. https://doi.org/10.1038/s41556-019-0311-8
Yeo SG, Kim ES (2013) Efficient approach for determining four-dimensional computed tomography-based internal target volume in stereotactic radiotherapy of lung cancer. Radiat Oncol J 31:247–251. https://doi.org/10.3857/roj.2013.31.4.247
Yu Y, Liang S, Zhou Y, Li S, Li Y, Liao W (2019) HNF1A/CASC2 regulates pancreatic cancer cell proliferation through PTEN/Akt signaling. J Cell Biochem 120:2816–2827. https://doi.org/10.1002/jcb.26395
Zhang S, Leng T, Zhang Q, Zhao Q, Nie X, Yang L (2018) Sanguinarine inhibits epithelial ovarian cancer development via regulating long non-coding RNA CASC2-EIF4A3 axis and/or inhibiting NF-kappaB signaling or PI3K/AKT/mTOR pathway. Biomed Pharmacother Biomed Pharmacother 102:302–308. https://doi.org/10.1016/j.biopha.2018.03.071
Zhang Y, Zhu M, Sun Y, Li W, Wang Y, Yu W (2019) Upregulation of lncRNA CASC2 suppresses cell proliferation and metastasis of breast cancer via inactivation of the TGF-beta. Signal Pathway Oncol Res 27:379–387. htttps://doi.org/10.3727/096504018X15199531937158
Zhang H et al (2019) Long non-coding RNA CASC2 upregulates PTEN to suppress pancreatic carcinoma cell metastasis by downregulating miR-21. Cancer Cell Int 19:18. https://doi.org/10.1186/s12935-019-0728-y
Zhang Q, Chen M, Cao L, Ren Y, Guo X, Wu X, Xu K (2020a) Phenethyl isothiocyanate synergistically induces apoptosis with Gefitinib in non-small cell lung cancer cells via endoplasmic reticulum stress-mediated degradation of Mcl-1. Mol Carcinogen 59:590–603. https://doi.org/10.1002/mc.23184
Zhang SR et al (2020b) Chalcomoracin inhibits cell proliferation and increases sensitivity to radiotherapy in human non-small cell lung cancer cells via inducing endoplasmic reticulum stress-mediated paraptosis. Acta Pharmacol Sin 41:825–834. https://doi.org/10.1038/s41401-019-0351-4
Zhu H, Abulimiti M, Liu H, Su XJ, Liu CH, Pei HP (2015) RITA enhances irradiation-induced apoptosis in p53-defective cervical cancer cells via upregulation of IRE1alpha/XBP1 signaling. Oncol Rep 34:1279–1288. https://doi.org/10.3892/or.2015.4083
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The present study was supported by Natural Science Foundation of Hunan Province (grants #15A0106), Changsha, Hunan, People’s Republic of China.
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All authors participated in the design, interpretation of the studies and analysis of the data and review of the manuscript. YY, ZD and JK conducted the experiments, YY supplied critical reagents, ZD carried out the data collection, analysis and interpretation, wrote the manuscript. JK participated in the experiment process, data collection and analysis.
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Ding, Z., Kang, J. & Yang, Y. Long non-coding RNA CASC2 enhances irradiation-induced endoplasmic reticulum stress in NSCLC cells through PERK signaling. 3 Biotech 10, 449 (2020). https://doi.org/10.1007/s13205-020-02443-7
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DOI: https://doi.org/10.1007/s13205-020-02443-7