Review Article
Austin J Med Oncol. 2020; 7(1): 1048.
Functional Significance of miRNA-149 in Lung Cancer: Can it be Utilized as a Potential Biomarker or a Therapeutic Target?
Chauhan SJ, Thyagarajan A and Sahu RP*
Department of Pharmacology and Toxicology, Boonshoft School of Medicine, Wright State University, Dayton, USA
*Corresponding author: Sahu RP, Department of Pharmacology and Toxicology Boonshoft School of Medicine, Wright State University 3640 Colonel Glenn Hwy, Dayton, USA
Received: May 21, 2020; Accepted: June 10, 2020; Published: June 17, 2020
Abstract
Accumulating evidence has documented the significance of miR-149 as a promising tumor-suppressive non-coding RNA that plays critical roles in regulating genes involved in cancer growth and metastasis. Notably, the ability of miR-149 to be utilized as a potential biomarker in the diagnosis/prognosis or a therapeutic target has also been explored using various cellular and preclinical models, as well as in clinical settings of lung cancer. While the applicability of miR-149 in assessing tumor progression has been suggested, its potential in predicting treatment outcomes is needed to be verified in diverse settings of lung cancer patients. The current review presents an overview of the functional significance of miR-149 with ongoing challenges in non-small cell lung cancer.
Keywords: Lung cancer; miR-149; Cancer therapy
Abbreviations
NSCLC: Non-Small Cell Lung Cancer; SCLC: Small Cell Lung Cancer; miRs: MicroRNAs; UTR: 3’untranslated region; SOX2: SRY-Box Transcription Factor 2; GSK3a - Glycogen Synthase Kinase-3a; JunB - AP-1 Transcription Factor Subunit AKT1 - Protein kinase B; PARP-2: Poly [ADP-ribose] polymerase 2; GIT1: G-protein-Coupled Receptor Kinase Interacting Protein 1; ErbB3: Receptor Tyrosine-Protein Kinase-3; Rap1a: Ras-Related Protein Rap-1A Rap2b - Ras-Related Protein Rap-2B; NDST1: Bifunctional Heparan Sulfate N-Deacetylase/N-Sulfotransferase; 1 PPM1F: Protein Phosphatase Mg2+/Mn2+ Dependent 1F; ZBTB2: Zinc finger and BTB domain containing 2 Wnt-1: Proto-oncogene protein Wnt-1; E2F1: Transcription Factor E2F1; EMT: Epithelialto- Mesenchymal Transition; ECM - Extracellular Matrix; MMPs: Matrix Metalloproteinases; MMP-2: Matrix Metalloproteinase -2; POSTN: Periostin; VCAN: Versican; FOXM1: Forkhead Box Protein M1; LncRNAs: Long non-coding RNAs; HNF1A-AS1: Hepatocyte Nuclear Factor-1 homeobox A (HNF1A)-antisense RNA 1 (AS1); Cdk6: Cyclin-Dependent Kinase 6; PCAT-1: Prostate Cancer- Associated ncRNA Transcripts 1; LRIG2: Leucine-Rich Repeats and Immunoglobulin like domains 2; BcYrn1: Brain cytoplasmic RNA 1; LINC00472: Long Intergenic Non-Protein-Coding RNA 472; CSCs: Cancer stem cells; LINC00460: long intergenic non-proteincoding; RNA 460 SNPs: Single Nucleotide Polymorphisms; TOP1: Topoisomerases 1 pathway
Introduction
While prostate and breast cancers were estimated the most prevalent cancers in 2019 affecting both males and females, respectively, lung cancer was regarded as the second most predominant cancer accounting for up to 13% of all cancer cases diagnosed in the United States [1-6]. Also, lung cancer remains the leading cause of cancer-related deaths affecting both men and women with mortality rates of 23% and 24%, respectively [1-10]. Notably, the two main types of lung cancer, namely Small Cell Lung Carcinoma (SCLC), and Non-Small Cell Lung Carcinoma (NSCLC) majorly differ in their site of origin, and an overall prevalence of cancer cases (15% versus 85%), respectively [11-13]. Based upon their site of origin, NSCLC is further divided into 3 subtypes, namely, adenocarcinoma, squamous cell carcinoma, and large cell carcinoma [11-13]. While the cellular, molecular, and genetic modifications underlying the pathogenesis of lung cancer are becoming apparent, the exact mechanism governing the development of normal respiratory epithelium to neoplastic transformation is still not very well defined. This restricts the ability for early diagnosis or prognosis, as well as in overcoming chemoresistance induction of this cancer type, which continues to be the main wellness and socio-economic issues [7-9,14,15].
Importantly, several risk factors have been identified to be associated with lung carcinogenesis including environmental factors, and pollutants such as cigarette smoking, arsenic exposure, etc., as well as genetic modifications [7,8]. In the United States, cigarette smoking continues to be the major risk factor for lung cancer, which accounts for 80% to 90% of lung cancer deaths [10]. Several of these risk factors can contribute to lung carcinogenesis via their abilities to induce alterations in cellular signaling pathways, and their regulations, etc. Thus, to understand the whole cellular events involved in lung tumorigenesis has been complex and challenging, which necessitates the identification of biomarkers to aid in the diagnosis and/or prognosis. Of significance, cancer-specific microRNA expression signatures have been explored to understand several clinicopathological variables including tumor stages and metastasis, disease reoccurrence and treatment resistance, as well as patient survival [16-29].
MicroRNAs (miRs) are conserved single-stranded non-coding RNA molecules comprising of 19-22 nucleotides, which play important roles in essentially all the biological and pathophysiological processes including cancer [16-17]. The common biogenesis of miRs is a multi-step process. This involves various RNAse and RNA polymerase enzymes such as Drosha and Dicer, as well as helicase resulting in the conversion of primary miRs to precursor miRs, and finally to mature miRs [18-20]. miRs regulate gene expression via forming base pairing to the target mRNAs sequences within the 3’Untranslated Region (UTR), which results in either translation repression, direct mRNA degradation, or miR-mediated mRNA degradation [21-22]. Notably, several miRs have been identified to be expressed endogenously in any given cancer types, which can target hundreds of miRs. Therefore, miRs’ expression signatures were primarily utilized to characterize the highly up- and down-regulated miRs, to then determine their mechanisms in cancer growth and metastasis and efficacy of cancer therapies.
To date, miRs are aberrantly expressed in human malignancies, and their up- or downregulation has been implicated to either promote or suppress cancer growth [23-25]. Importantly, genetic and epigenetic alterations have also been demonstrated to dysregulate the functions of miRs [26-47]. Contrary to most of the miRs that have been reported for their oncogenic effects, miR-149 has been identified to play dual roles (i.e., oncogenic and tumor-suppressive) depending upon the types of cancer. Of note, due to their translational significance, miRs including miR-149 have been explored for their therapeutic implications as well as biomarkers applicability in cancer models including lung cancer. In this review, we will discuss the functional significance of miR-149 as a promising therapeutic target and a potential biomarker in lung cancer.
miR-149 has been identified to be located on chromosomes 2 at 2q37.3 [30]. Multiple studies have demonstrated that miR-149 plays critical roles in regulating various activities of tumor cells including cell proliferation and apoptosis. Notably, in glioblastoma multiforme, melanoma, prostate, and liver cancer models, miR- 149 plays oncogenic roles, which are mediated by the upregulation of its target genes such as SRY-Box Transcription Factor 2 (SOX2), Glycogen synthase kinase-3a (GSK3-a), AP-1 transcription factor subunit (JunB), etc. [31,33,36]. However, in other cancer models such as neuroblastoma, hepatic, renal cell, breast, gastric, and pancreatic carcinomas, miR-149 functions as a regulator of tumor progression. This miR-149-induced effect was mediated via its ability to downregulate the target genes such as protein kinase B (AKT1), Poly [ADP-ribose] polymerase 2 (PARP-2), G-Protein-Coupled Receptor Kinase Interacting Protein 1 (GIT1), receptor tyrosine-protein kinase-3 (ErbB3), Ras-Related Protein Rap-1A (Rap1a), Ras-Related Protein Rap-1B (Rap2b), bifunctional heparan sulfate N-deacetylase/ N-sulfotransferase 1 (NDST1), protein phosphatase Mg2+/Mn2+ dependent 1F (PPM1F), zinc finger and BTB domain containing 2 (ZBTB2), proto- oncogene protein Wnt-1 (Wnt-1), transcription factor E2F1 (E2F1), etc. [31-41]. Particularly, in lung cancer models, miR-149 has been shown to function as a tumor suppressor via its ability to induce apoptosis [42,43].
miR-149 as a therapeutic target
In most cases, the cancer-related deaths occur because patients are usually diagnosed at an advanced and/or metastatic stage of the disease [48,49]. Therefore, the exploration of the link between tumor cells and its microenvironment is necessary to understand the underlying mechanisms of cancer metastasis to improve the treatment outcomes. In the initiation phase of metastasis, cancer progression requires the invasive potential of primary tumor cells, which is enabled through the Epithelial-To-Mesenchymal Transition (EMT). This process is characterized by the loss of E- cadherin mediated cell adhesion, and an increase in cell motility, which facilitates tumor invasion and metastasis to distant organs [48-50]. Importantly, the Extracellular Matrix (ECM) has been shown to be crucial in tumor tissue formation via its ability to regulate tumor cell adhesion, proliferation, differentiation, invasion, and migration [51,52]. Notably, several ECM components and proteins including matrix metalloproteinases (MMPs) such as MMP-1, MMP- 2, MMP- 9, and proteins such as Periostin (POSTN), and Versican (VCAN) are associated with the induction of EMT process and involved in favoring the metastatic potential of cancer cells [51, 53-57].
Since highly aggressive metastatic cancers such as colon, kidney, breast, and sarcoma often spread to the lungs, multiple studies have explored the significance of miRs to delineate the mechanism between lung cancer metastases and the manipulation of the EMT process [24,57]. In a study, Yang and colleagues observed that the expression of miR-149 is downregulated and was inversely correlated with the invasive potential of NSCLC cell lines. Further studies demonstrated that overexpression of miR-149 increased protein expression of E-cadherin and decreased protein expression of vimentin (involve in regulating EMT phenotype) in NSCLC cells. These findings indicate that miR-149 inhibits the EMT process, which is suggestive of its tumor-suppressive activity [24,57].
Importantly, the forkhead family of transcription factors such as Forkhead Box Protein M1 (FOXM1) has been identified to function as an oncogene and shown to promote tumor progression, invasion, and chemoresistance via its ability to target cell cycle proteins such as cyclin D1, and MMPs [23,24,57-63]. Notably, FOXM1 has also been found to be the target of several miRs in the NSCLC model. A study demonstrated that miR-149 efficiently inhibits the EMT process in human A549 and H1299 NSCLC cell lines by targeting FOXM1 [57]. These findings indicated that miR-149 restoration could be used as a possible therapeutic approach for NSCLC treatment. Another study by Zhao and colleagues have shown that miR-149 overexpression inhibits cell proliferation, migration, invasion, and induces apoptosis in human HCC827 and A549 cell lines. Importantly, miR-149 inhibition reverses these processes [61]. Further studies demonstrated that FOXM1 is a downstream target of miR-149 and downregulates cyclin D1 and MMP- 2 expression. The overexpression of miR-149 also inhibited the NSCLC tumor growth and metastasis in vivo [61]. Of significance, the clinical data suggested that miR-149 expression is downregulated in NSCLC patients, and was also correlated with patients’ overall survival rate [61]. Together this evidence suggested that miR-149 functions as a potential tumor suppressor, and thus can be considered as a target to assess lung cancer progression, invasion, and metastasis.
Multiple studies have also reported that miR-149 effects are modulated by long non-coding RNAs (lncRNAs). LncRNAs consist of 200 nucleotides and are implicated in regulating gene expression at the transcriptional level by recruiting chromatin-modifying complexes, and at the posttranscriptional level through interacting with miRs, mRNAs, and proteins [64-72]. While lncRNAs are unable to translate the protein [64-69], they play critical roles in cancer by dysregulating miRs function (66-72). To that end, a study by Liu et al., have demonstrated that lncRNA Hepatocyte Nuclear Factor-1 homeobox A (HNF1A)-antisense RNA 1 (AS1) (i.e., lncRNA HNF1A-AS1) directly binds to miR-149 and inhibits its expression via regulating cyclin-dependent kinase 6 (Cdk6) [65]. These findings indicate that lncRNA HNF1A-AS1 exerts oncogenic effect through its sponging effect on miR-149 in favoring NSCLC progression [65]. Along similar lines, another report has shown that lncRNA prostate cancer-associated ncRNA transcripts 1 (i.e., PCAT-1) mediate its effects by regulating miR-149 expression via leucine-rich repeats and immunoglobulin-like domains 2 (LRIG2) to modulate lung cancer progression [64].
Given that aerobic glycolysis converts glucose into pyruvate, which is then oxidized into lactate, resulting in the destruction of the ECM, and favoring cancer cells in acquiring the metastatic potential that leads to the augmentation of cell proliferation, and apoptotic resistance [73-86]. Studies have also hypothesized that lncRNAs may target the glycolysis process in cancer and found that lncRNA brain cytoplasmic RNA 1 (i.e., BcYrn1) regulates glycolysis in NSCLC [68]. This fact was also supported by studies demonstrating that miR-149 expression was significantly downregulated in A549 cells following lncRNA BcYrn1 overexpression via targeting Pyruvate Kinase M2 (PKM2) (68). In contrast, another study performed by Zou and colleagues have demonstrated that overexpression of long intergenic non-protein-coding RNA 472 (i.e., LINC00472) inhibits NSCLC growth via killin (KLLN)/p53 signaling by targeting miR-149 [66]. This evidence suggested that lncRNAs can modulate the tumorsuppressive action of miR-149 in promoting the growth of NSCLC. Thus, miR-149 could be targeted to circumvent these lncRNAsinduced effects in lung cancer. The studies suggesting miR-149 as a promising therapeutic target are summarized in Table 1.
No.
Research tools
miR-149 expression level
Targets
Findings
Refs.
1
NSCLC cell lines - A549,Calu3, Calu1, H1299
Downregulated
EMT process and FOXM1
Functions as a suppressor of EMT
57
2
NSCLC patients, cell line – 293T, BEAS-2B, A549, H1299, H1975, HCC827 and in vivo
Downregulated
FOXM1
Attenuates lung cancer growth and metastasis
61
3
NSCLC patients, cell line – BEAS-2B, A549, H1299, H1563, SKMES1, H1437, H2023 and in vivo
Downregulated
lncRNA HNF1A-AS1 and Cdk6
Modulate lung cancer growth by sponging miR- 149 effects
65
4
NSCLC patients, cell lines – 16HBE, H460, SK-MES-1, SPC-A-1, H1299
Downregulated
lncRNA PCAT-1 and LRIG2
Augments cancer growth by sponging the miR-149 effects
64
5
NSCLC patients, cell lines – 16HBE, A549, H1299, H460
Upregulated
lncRNA BCYRN1, PKM2 and glycolysis
Promotes tumor progression by regulating miR-149
68
6
NSCLC patients, cell lines – BEAS-2B, H838, H1975, H157, H358, H1299 and in vivo
Upregulated
LINC00472, KLLN and p53 signaling pathway
lncRNA downregulate miR-149 effect and suppresses tumor growth
66
Table 1: Summary of studies indicating miR-149 as a promising therapeutic target.
miR-149 as a potential biomarker
In addition to the miR-149 potential to be used as a therapeutic target, multiple studies have also supported its applicability as a biomarker because chemoresistance remains an exciting and challenging area of therapeutic invention. Given that the induction of drug resistance could either be intrinsic or acquired and developed during the course of the treatment or post-treatment via various mechanisms, several studies have shown that miR-149 plays an important role in modulating the drug sensitivity as well as chemoresistance [31,41]. In the NSCLC model, an inhibitor of miR- 149 has been shown to increase the sensitivity of tyrosine kinases (i.e., gefitinib drug) whereas overexpression of miR-149 was found to result in acquired drug resistance [73]. As Cancer Stem Cells (CSCs) play critical roles in drug resistance, agents to target CSCs have been postulated to increase the drug sensitivity through modulating miRs against NSCLC [84]. In a study, Chen and colleagues demonstrated that the stemness of NSCLC cells is related to the levels of miR- 149 expression and drug resistance. The authors demonstrated that miR-149 overexpression can induce stemness in A549 cells whereas its inhibition can reduce the stemness of paclitaxel-resistant A549 cells. However, ursolic acid possessing anticancer effect was found to reduce the stemness of A549 resistant cells by its ability to increase miR-149 expression that overcomes the resistance of NSCLC cells via Myeloid differentiation primary response 88 (MyD88) [84]. Of importance, studies by Nakano and colleagues have shown that overexpression of long intergenic non-protein-coding RNA 460 (i.e., LINC00460) was associated with poor responses to osimertinib, gefitinib, and erlotinib treatments, and resulted in the induction of resistance mediated by decreasing miR-149 expression [67]. Taken together, these studies indicate that miR-149 can be considered as a potential biomarker for predicting the sensitivity or drug-resistance of lung cancer to therapeutic agents.
Of significance, several studies have discovered a correlation between Single Nucleotide Polymorphisms (SNPs) or mutations in miRs and the risk or susceptibility to lung cancer. SNPs represent an alternative type of genetic variation, which was suggestive to be associated with stimulating the risks and/or outcomes of human diseases. SNPs in pre- miRNAs have been shown to alter miRs expression that could influence the prognosis of lung cancer [74- 83]. Studies by Lingzi and colleagues conducted a prospective cohort study in the Chinese female population and found that NSCLC patients having a C allele expresses a high level of miR-149, which resulted in decreased cell proliferation and increased drug sensitivity via targeting topoisomerases 1 (TOP1) pathway [74]. These findings indicated that polymorphisms in miR-149 may be associated with the overall survival of NSCLC patients [74]. However, a case- control study conducted by Li and colleagues has reported that miR-149 rs2292832 polymorphism is not associated with lung cancer risk [75]. In contrast, another report by Fang and colleagues indicated that miR-149 rs71428439 polymorphism correlates with lung cancer susceptibility, and thus, may be beneficial in predicting the risk of occurrence of lung cancer [76]. Altogether these data suggest that genetic variations in miR-149 can be considered as a potential biomarker in the diagnosis or prognosis of lung cancer. The studies indicating the applicability of miR-149 as a potential biomarker are summarized in Table 2.
No.
Research tools
miR-149 expression level
Targets
Findings
Refs.
1
NSCLC cell lines – HCC827
Downregulation
-
Increases drug sensitivity
73
Upregulation
Leads to acquired drug resistance
2
NSCLC cell lines – A549 and A549-PR and in vivo
Upregulation
MyD88 and NSCLC cell stemness
Increases NSCLC cell stemness and leads to chemoresistance of cells
84
3
NSCLC patients
Downregulated
lncRNA LINC00460
Induction of resistance
67
4
NSCLC patients
Upregulation
TOP1 signaling pathway
Reduces cell proliferation and increases drug sensitivity
74
5
NSCLC patients
miR-149 rs2292832
-
Not associated with lung cancer risk
75
6
NSCLC patients
miR-149 rs2292832
-
Correlates with lung cancer susceptibility
76
Table 2: Summary of studies suggesting miR-149 as a potential biomarker.
Conclusion
While several studies have suggested the current applicability of miR-149 in assessing tumor progression, invasion, metastasis, etc., using in vitro and in vivo model systems, as well as human samples, blinded case-controlled studies in diverse settings of lung cancer patients, are needed to confirm its implication as a therapeutic target or a biomarker. Moreover, the potential of miR-149 in predicting treatment outcomes is warranted.
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