- 1Department of Medical Genetics, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
- 2Phytochemistry Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
- 3Department of Clinical Analysis, College of Pharmacy, Hawler Medical University, Erbil, Iraq
- 4Institute of Human Genetics, Jena University Hospital, Jena, Germany
- 5Urology and Nephrology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
- 6Skull Base Research Center, Loghman Hakim Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran
The long non-coding RNA (lncRNA) cancer susceptibility 11 (CASC11) is a newly identified lncRNA located on chromosome 8q24.21. The expression of lncRNA CASC11 has been found to be elevated in different cancer types and the prognosis of the tumor is inversely correlated with the high CASC11 expression. Moreover, lncRNA CASC11 has an oncogenic function in cancers. The biological characteristics of the tumors, such as proliferation, migration, invasion, autophagy, and apoptosis can be controlled by this lncRNA. In addition to interacting with miRNAs, proteins, transcription factors, and other molecules, the lncRNA CASC11 modulates signaling pathways including Wnt/β-catenin and epithelial-mesenchymal transition. In this review, we have summarized studies on the role of lncRNA CASC11 in the carcinogenesis from cell lines, in vivo, and clinical perspectives.
Introduction
According to the ENCODE project, although more than 80% of the human genome is transcribed, about 98% of these transcripts do not encode proteins (Harrow et al., 2012). A particular type of RNAs, called long non-coding RNAs (lncRNAs) lacks the ability to code for proteins but are involved in important cellular processes (Bridges et al., 2021). LncRNAs appear to play a variety of roles in the regulation of epigenetic modifications, transcription, post-transcriptional modifications, and translation, according to numerous studies that have been conducted up to now (Bhat et al., 2016; Peng et al., 2017). They can interact with proteins while still being linked to their transcriptional site or they can interact with chromatin-modifying complexes to regulate transcription of target genes in cis or trans, respectively (Rinn et al., 2007; Wang et al., 2008). In addition, the possibility of lncRNAs interacting with microRNAs (miRNAs) to carry out their biological functions has long been known (Jalali et al., 2013). Undeniably, lncRNAs are involved in the pathogenesis of many diseases, including various cancers (Chen F. et al., 2019).
Different functions of lncRNAs depend on their localization and their specific interfaces with DNA, RNA and proteins. Through these interactions, lncRNAs regulate chromatin function and modulate the establishment and function of membraneless nuclear bodies. Most notably, lncRNAs can change the stability and translation of mRNAs in the cytoplasm. Similar to protein coding genes, lncRNAs interfere with signaling pathways (Statello et al., 2021).
The coding gene of lncRNA cancer susceptibility 11 (CASC11) is an lncRNA encoded by a gene on chromosome 8q24.21 and has two transcript variants (https://www.ncbi.nlm.nih.gov/gene/100270680) (Figure 1). There are other CASC genes in the human genome such as CASC1 (chr 12p12.1), CASC2 (chr 10q26.11) and CAS3 (17q21.1). Notably, CASC8 is also affiliated with the lncRNA class.
FIGURE 1. The newly discovered lncRNA cancer susceptibility 11 (CASC11) has a coding gene with five exons and is located on chromosome 8q24.21.
The expression of lncRNA CASC11 has been found to be elevated in different cancer types and the prognosis of the tumor is inversely correlated with the high CASC11 expression. As a result, lncRNA CASC11 has an oncogenic function in cancers. The biological characteristics of malignant cells, such as proliferation, migration, invasion, autophagy, and apoptosis can be controlled by this lncRNA. In addition to interacting with miRNAs, proteins, transcription factors, and other molecules, the lncRNA CASC11 modulates signaling pathways including Wnt/β-catenin and epithelial-mesenchymal transition (EMT) to carry out these regulatory functions (Zheng et al., 2021; Wang et al., 2022).
In this review, we have summarized studies on the role of lncRNA CASC11 in the carcinogenesis from cell lines, in vivo, and clinical perspectives. The data summarized in this manuscript highlights the importance of CASC11 in the carcinogenesis and suggests this lncRNA as a putative target for anti-cancer therapies.
Role of CASC11 in cancers
Cell line studies
The role of CASC11 in the carcinogenesis has been evaluated in several cancer cell lines. In bladder cancer cell lines, upregulation of CASC11 has led to suppression of miR-150 expression. However, miR-150 overexpression could not affect expression of CASC11. Over-expression of CASC11 promotes, while miR-150 overexpression inhibits cancer cell proliferation. In addition, miR-150 could attenuate the increasing effect of CASC11 upregulation on proliferation of cancer cells. Conversely, upregulation of CASC11 could not affect migration and invasion of bladder cancer cells. Cumulatively, CASC11 has a role in regulation of proliferation of bladder cancer cells through modulation of miR-150 levels (Wang et al., 2019).
Similarly, CASC11 has an oncogenic role in cervical cancer. In these cells, CASC11 silencing has inhibited proliferation, migratory potential and invasiveness and induced their apoptosis. Upregulation of CASC11 could facilitate cancer cell proliferation, migration and invasive abilities and suppress their apoptosis. Mechanistically, CASC11 promotes migration and invasion of cervical cancer cells through inducing activity of Wnt/β-catenin signaling (Hsu et al., 2019).
Similar to bladder cancer, CASC11 has been shown to sponge certain miRNAs in colorectal cancer cell. Experiments in colorectal cancer cells have shown the ability of CASC11 to bind with miR-646 and miR-381-3p in the cytoplasm. Besides, miR-646 and miR-381-3p inhibitors could reverse the inhibitory effects of CASC11 knock out on proliferation of colorectal cancer cells. Notably, RAB11FIP2 has been found to be a common target of miR-646 and miR-381-3p. Mechanistically, CASC11 regulates PI3K/AKT pathway through regulation of miR-646 and miR-381-3p/RAB11FIP2 axis (Zhang et al., 2021). CASC11 can also enhance proliferation of colorectal cancer cells through targeting hnRNP-K and activating WNT/β-catenin signaling (Figure 2). Moreover, c-Myc has been shown to directly bind to the promoter of CASC11 and increase histone acetylation to induce expression of CASC11 (Zhang et al., 2016). CASC11 knockdown in esophageal cancer cells has led to enhancement of cell apoptosis. Moreover, its silencing has resulted in upregulation of expression of KLF6 protein. Based on the results of recovery experiments, CASC11 and KLF6 have been shown to be mutually regulated (Chen SG. et al., 2019). Another study in gastric cancer cells has shown that expression of CASC11 is induced by overexpression of LINC01116. Similarly, CASC11 overexpression has resulted in up-regulation of LINC01116. Both lncRNAs have important roles in induction of invasion and migration of gastric cancer cells (Su et al., 2019). CASC11 can also promote malignant features in gastric cancer through regulation of cell cycle pathway (Zhang et al., 2018).
FIGURE 2. This diagram depicts the association between CASC11 and oncogenic signaling pathways in a variety of malignancies. CASC11 promotes tumor cell proliferation, invasion, migration, and survival by targeting specific genes like PTEN and YBX1 and sponging certain miRNAs. Some examples of these miRNAs are miR-381, miR-646, miR-676-3p, miR-340-5p, and miR-498.
In the glioma cells, CASC11 has been demonstrated to sponge miR-498 and increase expression of FOXK1 (Jin et al., 2019). Table 1 shows the results of cell line assays to determine function of CASC11 in various cancer types.
TABLE 1. Cell line assays to determine function of CASC11 in various cancer types (TCLs: tumor cell lines, NCL: normal cell line, ∆: knockdown or deletion, EMT: epithelial-mesenchymal transition).
Obtained from https://app.biorender.com/biorender-templates. BioRender was used in accordance with the terms of the Academic License.
Animal studies
Consistent with in vitro studies, animal studies have affirmed the oncogenic role of CASC11. In animal models of cervical cancer, CASC11 silencing has led to reduction of tumor volume and weight and downregulation of β-catenin (Hsu et al., 2019). Similarly, experiments in animal models of colorectal cancer have shown the role of CASC11 in enhancement of tumor growth. Moreover, miR-646 and miR-381-3p inhibitors have been shown to reverse the inhibitory effects of CASC11 silencing on tumor growth and metastasis (Zhang et al., 2021). Besides, CASC11 silencing has reduced Ki-67 expression and suppressed metastases of colorectal cancer to lung and liver (Zhang et al., 2016). Other studies in animal models of glioma, hepatocellular carcinoma, lung cancer and prostate cancer support oncogenic role of CASC11 (Table 2).
Studies in clinical samples
Plasma levels of CASC11 has been found to be up-regulated, while levels of miR-150 has been down-regulated in early stages bladder cancer compared with their levels in healthy controls. Notably, altered expressions of these two transcripts could separate patients with bladder cancer from healthy subjects. Moreover, CASC11 expression has been inversely correlated with miR-150 expression in patients with bladder cancer but not in cancer-free subjects (Wang et al., 2019). In patients with cervical cancer, CASC11 expression has been positively associated with tumor size and FIGO staging and negatively correlated to the survival of patients (Hsu et al., 2019). CASC11 has also been found to be up-regulated in colorectal cancer tissues in association with tumor dimension, serosal invasion, metastasis to lymph node, and TNM stage (Zhang et al., 2016). Besides, expression of CASC11 in the esophageal carcinoma tissues has been remarkably higher than its expression in adjacent normal tissues. Up-regulation of CASC11 has been associated with higher pathological stage and lower overall survival rate in this cancer (Chen SG. et al., 2019). In gastric cancer tissues, expression of CASC11 has been found to be increased parallel with up-regulation of another lncRNA, namely, LINC01116. Expression levels of both lncRNAs have been higher in tissue samples with higher clinical stages (Su et al., 2019). Other studies that reported up-regulation of CASC11 in tumor tissues are shown in Table 3.
TABLE 3. CASC11 expression in clinical samples of cancer (PTTA: pairs of tumor tissues and adjacent normal tissues, TNM: tumor-node-metastasis, T stage: tumor stage, OS: overall survival, DFS: disease-free survival, FIGO: international federation of gynecology and obstetrics, TCGA: the cancer genome atlas, GEO: gene expression omnibus).
Discussion
CASC11 is an lncRNA participating in the pathoetiology of diverse cancers as well as atherosclerosis, coronary artery disease and postmenopausal osteoporosis. It is universally up-regulated in malignant tissues and cancer cell lines compared with controls. Therefore, CASC11 can be regarded as an oncogenic lncRNA. This observation has also been affirmed in xenograft models of different cancers. Mechanistical studies have shown the sponging effect of CASC11 on miR-150, miR-646, miR-381-3p, miR-340-5p, miR-498, miR-21, miR-188-5p, miR-302, miR-676-3p, miR-498, miR-182, and miR-145. Moreover, expression of CASC11 has been shown to be regulated by c-Myc, STAT3, YY1, and FOXO3. Therefore, a complex network exists between cancer-related transcription factors, CASC11 and miRNAs. Identification of further molecules being involved in this network would facilitate design of novel therapeutic options for cancer.
Since this lncRNA can be tracked in plasma, it is a possible novel biomarker for detection of cancer recurrence after accomplishment of appropriate therapies.
Moreover, up-regulation of CASC11 in tumor tissues has been related with poor prognosis and adverse clinicopathological characteristics such as metastasis, lymph node involvement, higher grades and advanced stages. Thus, CASC11 is a putative prognostic marker for diverse cancers.
Taken together, CASC11 is an oncogenic lncRNA with possible application as diagnostic and prognostic marker in cancer. Yet, three are several unsolved questions about the underlying mechanism of CASC11 up-regulation in cancers, possible impact of genetic polymorphisms on its function and activity, the role of epigenetic factors in its regulation and the interactions between CASC11 and other regulatory biomolecules. Finding the answers to these questions might facilitate design of novel therapeutic modalities for cancers.
Author contributions
SG-F wrote the draft and revised it. MT designed and supervised the study. AH, BH, and GS collected the data and designed the figures and tables. All authors contributed to the article and approved the submitted version.
Acknowledgments
The authors would like to thank the clinical Research Development Unit (CRDU) of Loghman Hakim Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran for their support, cooperation and assistance throughout the period of study.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher’s note
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Keywords: CASC11, lncRNA, cancer, expression, biomarker
Citation: Ghafouri-Fard S, Harsij A, Hussen BM, Taheri M and Sharifi G (2023) A review on the role of CASC11 in cancers. Front. Cell Dev. Biol. 11:1131199. doi: 10.3389/fcell.2023.1131199
Received: 24 December 2022; Accepted: 16 June 2023;
Published: 23 June 2023.
Edited by:
Chandrama Mukherjee, Presidency University, IndiaReviewed by:
Md Afjalus Siraj, Yale University, United StatesYuen Gao, Michigan State University, United States
Copyright © 2023 Ghafouri-Fard, Harsij, Hussen, Taheri and Sharifi. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Mohammad Taheri, TW9oYW1tYWQudGFoZXJpQHVuaS1qZW5hLmRl; Guive Sharifi, Z2libm93QHlhaG9vLmNvbQ==