Abstract
Long non-coding RNAs have recently attracted considerable attention due to their aberrant expression in human diseases. LncMIR31HG is a novel lncRNA that is abnormally expressed in multiple diseases and implicated in various stages of disease progression. A large proportion of recent studies have indicated that MIR31HG has biological functions by triggering various signalling pathways in the pathogenesis of human diseases, especially cancers. More importantly, the abnormal expression of MIR31HG makes it a potential biomarker in diagnosis and prognosis, as well as a promising target for treatments. This review aims to systematically summarize the gene polymorphism, expression profiles, biological roles, underlying mechanisms, and clinical applications of MIR31HG in human diseases.
1 Introduction
Cancer is one of the leading causes of death worldwide with increasing incidence and mortality. Based on recent cancer statistics in 185 countries, 19.3 million new cases were diagnosed in 2021, and 10.0 million cancer patients died (Sung et al., 2021). In various types of cancers, abnormal expression of long non-coding RNAs (lncRNAs) can be detected, which is supposed to be related to proliferation, invasion, metastasis, and other biological aspects of cancer (Kopp and Mendell, 2018; Gyamfi et al., 2022; Vervoort et al., 2022). LncRNAs, more than 200 nucleotides in length, are non-coding RNA molecules that lack an open reading frame (Birney et al., 2007; Derrien et al., 2012). Unlike microRNAs(miRNAs), they cannot encode any protein but regulate chromatin dynamics, gene expression, growth, differentiation, and development due to their special length (Wang and Chang, 2011; Roberts et al., 2014). Several recent studies have indicated that lncRNAs play numerous roles in human malignant tumours (Cao et al., 2019; Zhou et al., 2021; Yang et al., 2022a).
LncRNA MIR31HG, also known as long non-coding HIF-1α coactivating RNA (LncHIFCAR) or LOC554202, is located in 9p21.3 with 2,166 bp in length and acts as a host gene for miR-31 in intron 2 (Augoff et al., 2012; Yan et al., 2018). We shed light on this recently-discovered lncRNA because several reports have shown that the lncRNA MIR31HG is aberrantly expressed in different cancers and affects numerous biological processes, including proliferation, metastasis, epithelial-mesenchymal transition (EMT), cellular senescence, and apoptosis in tumour development (Gupta et al., 2020; Tu et al., 2020). An increasing number of studies have also reported it can also participate in some signalling pathways (Zhang et al., 2021; Feng et al., 2022). Furthermore, the different functions performed by lncRNA MIR31HG depend on the tumour types and pathways involved. The complexity of these pathways presents great challenges but provides opportunities for the discovery of original cancer therapeutic targets and potential diagnostic biomarkers. Recently, more evidence has also shown that MIR31HG also participates in other diseases in addition to cancer, such as psoriasis, IgA nephropathy (IgAN), hirschsprung’s disease, rheumatoid arthritis (RA), and osteonecrosis of the femoral head (ONFH) (Cai et al., 2018; Gao et al., 2018; Yuan et al., 2020; Cao et al., 2021; Liu et al., 2022a).
This review aims to elaborate on the gene polymorphism, aberrant expression levels, biological roles, related mechanisms, and potential clinical applications of lncRNA MIR31HG in human diseases and concludes its function as a biomarker for the diagnosis, prediction, and treatment of human diseases.
2 MIR31HG gene polymorphisms
MIR31HG was first mentioned to participate in the translation process of mir31 and proved to be the host gene of mir31 in 2009 (Corcoran et al., 2009). MIR31HG contains four exons and three junctions, and mir31 is possibly located in intron2 (Augoff et al., 2012; Shih et al., 2017). A study in 2012 also assumed that there could be a large CPG island in its promoter, and showed the role of MIR31HG in promoting hypermethylation in human cancer (Augoff et al., 2012) (Figure 1).
FIGURE 1
Single nucleotide polymorphisms (SNPs) are involved in developing the role of specific genes in disease occurrence, and several recent analyses have revealed the supportive role of MIR31HG gene variations in the susceptibility of human diseases. Rs10965059, rs72703442, rs55683539, rs1332184, rs2181559, rs10965064, and rs2025327 were common SNPs used for MIR31HG polymorphism analyses (Daly et al., 2001). As an intronic variant of MIR31HG, rs10965059 is a crucial SNP because it was associated with susceptibility to various diseases including LDH, IgA nephropathy, steroid-induced osteonecrosis, and alcohol-induced osteonecrosis (Yuan et al., 2020; Liu et al., 2022a; Wang et al., 2022a; Hu et al., 2022). Aside from these non-cancers, MIR31HG polymorphisms also affect breast cancer (Wei et al., 2023). In Chinese women, three SNPS, rs72703442-AA, rs55683539-TT, and rs2181559-AA, were related to a lower risk of breast cancer (BC), while rs55683539 was considered the best risk-predictive single-locus model. According to estrogen receptor (ER) and progesterone receptor (PR) status analysis, rs79988146 was a relative gene variant for ER-positive and PR-positive breast cancer patients.
3 The expression level of MIR31HG in human diseases
Considerable research in recent years has continually investigated MIR31HG expression levels in cancer, including gastric cancer (Nie et al., 2016; Lin et al., 2018), breast cancer (Augoff et al., 2012; Shi et al., 2014; Xin et al., 2021), lung cancer (Qin et al., 2018; Dandan et al., 2019; Zheng et al., 2019), colorectal cancer (Ding et al., 2015; Yang et al., 2016a; Li et al., 2018; Eide et al., 2019), bladder cancer (He et al., 2016; Sveen et al., 2020), head and neck squamous cell carcinoma (Ren et al., 2017; Wang et al., 2018a; Chu et al., 2020), osteosarcoma (Sun et al., 2019), melanoma (Xu and Tian, 2020) and other cancer types (Yang et al., 2016b; Shih et al., 2017; Feng et al., 2020; Li, 2020; Chen et al., 2022; Ko et al., 2022; Tu et al., 2022). A pan-cancer analysis of gene expression was performed by the UALCAN database using The Cancer Genome Atlas (TCGA) data to determine the expression of MIR31HG in human cancers (Figure 2). Furthermore, MIR31HG expression seemed to share a strong relationship with clinical characteristics in a number of cancers, such as tumour node metastasis (TNM), differentiation, distant metastasis, disease-free survival (DFS), and overall survival (OS) (Table 1). In addition to human cancer, in specific human non-cancer MIR31HG overexpression was able to be found in psoriasis (Gao et al., 2018), IgAN (Yuan et al., 2020), RA, and ONFH (Cao et al., 2021). However, it is downregulated in hirschsprung’s disease (Cai et al., 2018). MIR31HG significantly influenced this human non-cancer with pathological progression and clinical traits (Table 2).
FIGURE 2
TABLE 1
| NO | Cancer types | Regulation | Related functions | Clinical features | Related genes | Source of evidence | Ref |
|---|---|---|---|---|---|---|---|
| 1 | Gastric cancer | Up Down | Proliferation, migration | Poor prognosis | — | Cell line studies | Nie et al. (2016),Lin et al. (2018) |
| Cell line, animal, and clinical studies | |||||||
| 2 | Breast cancer | Up Down (TNBC) | Proliferation, migration | Tumour size, clinical stage | POLDIP2 | Cell line, animal, and clinical studies | Augoff et al. (2012),Shi et al. (2014),Xin et al. (2021) |
| 3 | Lung cancer | Up | Proliferation, migration, invasion, metastasis, apoptosis, EMT | Clinical stage, TNM and OS | Mir-31 Mir-214 | Cell line, animal, and clinical studies | Qin et al. (2018),Dandan et al. (2019),Zheng et al. (2019) |
| 4 | Colorectal cancer | Up Down | Proliferation, apoptosis, cell cycle, angiogenesis, glycolysis | OS and DSS Tumour size and pathologic stage | Mir-361-3p | Cell line, animal, and clinical studies | Ding et al. (2015),Yang et al. (2016a),Li et al. (2018),Eide et al. (2019) |
| 5 | Bladder cancer | Up Down | Proliferation, migration | TNM stage, OS and DFS | - | Cell line and clinical studies | He et al. (2016),Sveen et al. (2020) |
| 6 | ESCC | Up Down | Proliferation, migration, invasion | TNM, distant metastasis; differentiation, OS | Mir-34a/c-met | Cell line, animal, and clinical studies | Ren et al. (2017),Chu et al. (2020) |
| 7 | LSCC | Up | Proliferation, tumourigenesis, apoptosis | Advanced T category, OS, and RFS | Mir-31, RhoA HIF1A and P21 | Cell line, animal, and clinical studies | Wang et al. (2018a) |
| 8 | Osteosarcoma | Up | Proliferation, invasion, migration, apoptosis, EMT | Metastasis | — | Cell line, animal, and clinical studies | Sun et al. (2019) |
| 9 | Melanoma | Up | Proliferation, invasion, migration | Metastasis, TNM stage | — | Cell line and clinical studies | Xu and Tian (2020) |
| 10 | Thyroid cancer | Up | Proliferation, invasion, migration, and apoptosis | Tumour size, lymph node metastasis | Mir-761 | Cell line and clinical studies | Chen et al. (2022) |
| 11 | Cervical cancer | Up | Cell growth and invasion | Tumour size, lymph node metastasis and OS | Mir-361-3p,EMP1 | Cell line, animal, and clinical studies | Li (2020) |
| 12 | Oral cancer | Up | Proliferation, invasion, and wound healing | Poor survival in stage IV, node metastasis in stage I-III | Mir-31, HIF-1α | Cell line, animal, and clinical studies | Shih et al. (2017),Tu et al. (2022) |
| 13 | PDAC | Up | Proliferation, invasion, apoptosis and EMT | DFS | Mir-193b | Cell line, animal, and clinical studies | Yang et al. (2016b),Ko et al. (2022) |
| 14 | NPC | Up | Proliferation, migration, and invasion | - | Mir-31/hroA | Cell line study | Feng et al. (2020) |
The expression, related functions, clinical features and related genes of MIR31HG in cancers.
TABLE 2
| NO | 1 | 2 | 3 | 4 | 5 |
|---|---|---|---|---|---|
| Non-cancer types | Psoriasis | IgA nephropathy | Hirschsprung’s disease | Rheumatoid arthritis | Osteonecrosis of femoral head |
| Regulation | Up | Up | Down | Up | Up |
| Related functions | Proliferation and cell cycle | — | Proliferation and migration | Proliferation, migration, inflammation | — |
| Clinical features | Diagnosis | Susceptibility | — | Treatment | Susceptibility |
| Source of evidence | Cell line study | Silico analysis | Cell line study | Cell line study | Silico analyses |
| Ref | Gao et al. (2018) | Yuan et al. (2020) | Cai et al. (2018) | Cao et al. (2021) | Liu et al. (2022a),Wang et al. (2022a) |
The expression, related functions, clinical features of MIR31HG in non-cancers.
3.1 The expression of MIR31HG in cancers
3.1.1 Pan-cancer analysis of MIR31HG expression
First, to determine the expression of MIR31HG in human cancers, the UALCAN database was used to investigate the pancancer expression of MIR31HG (Chandrashekar et al., 2017). Based on the data from TCGA, overexpression of the lncRNA MIR31HG was discovered in breast invasive carcinoma (BRCA), cervical squamous cell carcinoma and endocervical adenocarcinoma (CESC), colon adenocarcinoma (COAD), head and neck squamous cell carcinoma (HNSC), lung adenocarcinoma (LUAD), pancreatic adenocarcinoma (PAAD) and thyroid carcinoma (THCA). On the contrary, lower MIR31HG expression was found in kidney renal clear cell carcinoma (KIRC) and uterine corpus endometrial carcinoma (UCEC). As this is a simple analysis only dependent on the database, we further examined the MIR31HG expression in various types of cancers by searching related experiments and clinical research.
3.1.2 MIR31HG dysregulation in gastric cancer
Gastric cancer is the third most prevalent cancer all over the world, and its incidence and mortality have remained high in recent years (Thrift and El-Serag, 2020; Ajani et al., 2022; Yeoh and Tan, 2022). According to Nie’s research, a low expression level of MIR31HG was discovered in gastric cancer tissues compared with adjacent normal tissues. Its downregulated expression level was associated with larger tumour size, advanced pathological stage, and relatively poor prognosis (Nie et al., 2016). In contrast, MIR31HG was found to be overexpressed in gastric cancer in Lin’s study, especially in HGC27 and MGC-803 cell lines (Lin et al., 2018). On the one hand, MIR31HG played an important role in promoting cell proliferation and migration in MGC-803. On the other hand, in HGC27 cells, MIR31HG inhibited cell proliferation and migration, demonstrating the diverse functions of MIR31HG in different gastric cancer cell lines.
3.1.3 MIR31HG dysregulation in breast cancer
Breast cancer accounts for nearly 25% of cancers in women and is currently the most lethal cancer in females worldwide (Bray et al., 2018; Wang et al., 2021a). The expression of lncRNA MIR31HG was upregulated in various types of breast cancers (Shi et al., 2014; Xin et al., 2021), while MIR31HG was downregulated in triple-negative breast cancer (Augoff et al., 2012). For the first time, Shi et al. (2014) showed that MIR31HG knockdown could result in diminished cell proliferation by modulating the G1–S checkpoint and apoptosis in breast cancer. Experimental evidence from another study also indicated that silencing MIR31HG can suppress breast cancer proliferation migration, and invasion by targeting polymerase (DNA-directed), delta interacting protein 2(POLDIP2) (Xin et al., 2021). MIR31HG expression was notably upregulated in 20 breast cancer tissues in two cell lines (MDA-MB-231 and MDA-MB435S) collected from BC patients who received surgical resection, contrasting with the former result in 2012 (Augoff et al., 2012). Functionally, executed as an oncogene, MIR31HG influences the apoptotic, proliferative, and invasive capabilities, as well as tumour size and clinical stage in breast cancer (Shi et al., 2014).
3.1.4 MIR31HG dysregulation in lung cancer (LC)
It was estimated that nearly 2 million new lung cancer cases occurred and caused 1.76 million deaths in the past year, proposing the severity of LC worldwide (Brody, 2020; Thai et al., 2021). A great number of studies have demonstrated that MIR31HG overexpression in lung cancer tissues and related cell lines (A549, H2228, H1975, H1229) (Qin et al., 2018; Tu et al., 2020). A study on 152 tissue samples consisting of both lung adenocarcinoma and adjacent normal samples revealed that MIR31HG was related to advanced clinical staging and TNM stage (Qin et al., 2018). Zheng et al. (2019) performed research with 88 patients and demonstrated that the expression of MIR31HG also exhibited a close relationship with histological differentiation grade and lymph node metastasis in non-small cell lung cancer (NSCLC). In agreement with Zheng’s result, patients with MIR31HG overexpression are likely to have unfavourable OS (Dandan et al., 2019).
3.1.5 MIR31HG dysregulation in colorectal cancer (CRC)
Colorectal cancer is the third most prevalent malignant tumour and the second most common cause of cancer deaths worldwide (Ciardiello et al., 2022; Sinicrope, 2022). For the first time, a study revealed that MIR31HG expression was lower than that in non-cancerous colorectal tissues, and another study from Yang et al. involving 178 samples also supported this finding (Ding et al., 2015; Yang et al., 2016a). Patients with lower MIR31HG appeared to have a worse outcome of OS and DFS in colorectal cancer (Yang et al., 2016a). Contrary to the former study, emerging evidence has shown an elevated level of MIR31HG in CRC tissues compared with adjacent tissues (Li et al., 2018; Wang et al., 2022b). Moreover, in association with miR-31-5p, patients with MIR31HG outlier status had shorter relapse-free survival (RFS), highlighting the prognostic role of MIR31HG in colorectal cancer (Eide et al., 2019). Furthermore, in an experiment on 221 patients treated with oxaliplatin, the high performance of MIR31HG was also associated with high DFS and OS rates (Li et al., 2018).
3.1.6 MIR31HG dysregulation in bladder cancer
As the fourth most common malignancy in men and the most common malignancy in women, bladder cancer has been associated with high mortality and morbidity (Lenis et al., 2020). Growing evidence shows that MIR31HG expression is suppressed in bladder cancer and was consistent with the pan-cancer analysis (He et al., 2016). This study on 55 samples revealed that a lower level of MIR31HG was linked with advanced TNM stage, while another study indicated that in patients with the basal subtype, MIR31HG overexpression was discovered and correlated with poor OS and DFS (Sveen et al., 2020). The differentiation may be caused by different subtypes of bladder cancer in those studies.
3.1.7 MIR31HG dysregulation in head and neck squamous cell carcinoma (HNSCC)
As one of the most lethal cancers in the world, esophageal squamous cell carcinoma (ESCC) accounts for nearly 90% of new esophageal cancer cases per year (Abnet et al., 2018; Yang et al., 2020). Based on research including 185 samples, lower MIR31HG expression was detected in ESCC tissues from patients with ESCC compared with the control. A lower MIR31HG level was associated with worse differentiation, advanced lymph node metastasis, positive distant metastasis, and poorer OS (Ren et al., 2017). In the other two studies, MIR31HG expression was found to be upregulated in ESCC (Sun et al., 2018; Chu et al., 2020). Fifty-three blood samples from ESCC patients and 39 blood samples from healthy people were collected in Sun’s study which proposed that higher expression of MIR31HG was positively related to advanced TNM stage and lymphatic metastasis. Moreover, they discovered that MIR31HG could distinguish ESCC patients from healthy individuals through ROC curve analysis in plasma, indicating the role of MIR31HG in diagnosis (Sun et al., 2018).
Laryngeal squamous cell carcinoma (LSCC) remains one of the most common HNSCCs and leads to approximately 20% of all cases (Mody et al., 2021). Indeed, MIR31HG expression was reported to be upregulated in LSCC. One study in vitro and in vivo revealed that combined with HIF1α (hypoxia-inducible factor 1α) and P21, MIR31HG significantly accelerated cell growth and impaired apoptosis. Furthermore, in this experiment, sixty LSCC patients were divided into two groups according to diverse expression levels, and patients with lower MIR31HG expression had significantly better OS and RFS. Therefore, more research with a larger sample size is demanded to clarify the function of MIR31HG in HNSCC (Wang et al., 2018a).
3.1.8 MIR31HG dysregulation in osteosarcoma
Osteosarcoma, the most frequent type of primary malignant bone tumour, occurs mostly in adolescents and young adults (Kansara et al., 2014). With the development of curative therapy, wide resection surgery combined with chemo radiotherapy was applied and significantly improved the 5-year survival rate, but remains insufficient (Gill and Gorlick, 2021; Meltzer and Helman, 2021). An elevated level of MIR31HG was discovered in osteosarcoma samples. In detail, high expression of MIR31HG was associated with poor tumour stages and distant metastasis. Loss of MIR31HG further inhibited miR-361, which is a tumour suppressor that inhibits cell proliferation and migration. Except for miR-361, its downstream genes, such as vascular endothelial growth factor (VEGF), forkhead box protein 1(FOXM1), and Twist, were also suppressed in osteosarcoma cells, resulting in EMT and tumour growth (Sun et al., 2019). In summary, MIR31HG exerted oncogenic function by directly regulating miR-361 for tumour growth.
3.1.9 MIR31HG dysregulation in melanoma
Malignant melanoma (MM) is known as a fatal malignant tumour caused by mutant melanocyte proliferation (Nassar and Tan, 2020). One study demonstrated that the expression of MIR31HG was significantly upregulated in melanoma. Abundant expression of MIR31HG was significantly correlated with lymph node metastasis, distal metastasis, and TNM stage, and served as a prognostic biomarker for MM (Xu and Tian, 2020).
3.1.10 MIR31HG and other cancers
Based on research containing 57 papillary thyroid cancer (PTC) with a reference sample and four relative adjacent normal thyroid tissues, MIR31HG expression was correlated with M stage, N stage, and lymph nodes. For the first time, the research presented that higher expression of MIR31HG was connected with a higher level of immune infiltration in thyroid cancer (Chen et al., 2022). In cervical cancer, Li (2020) verified that MIR31HG silencing inhibited cervical cancer cell proliferation and invasion, whereas anti-miR-361-3p or overexpression of epithelial membrane protein 1 (EMP1) led to the opposite effect. Higher expression of MIR31HG can also be found in oral carcinoma, pancreatic ductal adenocarcinoma (PDAC), and nasopharyngeal carcinoma (NPC). The upregulated MIR31HG level in oral carcinoma was related to poor clinical outcomes and contributed to cancer progression (Shih et al., 2017). MIR31HG functions as an oncogene in PDAC, and the overexpression of MIR31HG is closely associated with poorer DFS in PDAC patients (Yang et al., 2016b; Ko et al., 2022). Increasing levels of MIR31HG enhanced NPC cell growth and metastasis, and could be inhibited by the regulation of mir-31 (Feng et al., 2020).
3.2 The expression of MIR31HG in non-cancers
3.2.1 Psoriasis
Psoriasis is commonly regarded as a chronic immune-related papulosquamous skin disease and negatively affects the life quality of patients (Griffiths and Barker, 2007; Walter, 2022). Previous research indicated that interleukin-17A (IL-17A), interleukin-22(IL-22), tumor necrosis factor-α (TNF-α), and interleukin-1α (IL-1α) were pro-inflammatory cytokines in psoriasis and linked with NF-κB signalling activation (Guilloteau et al., 2010; De Simone et al., 2015). In psoriasis, MIR31HG was found to be elevated in psoriasis lesions and the upregulation of MIR31HG required IL-17A, IL-22, TNF-α, and IL-1α stimulation, demonstrating that nuclear factor kappa B inhibitor (NF-κB) signalling could be crucial crosstalk in psoriasis. Moreover, p65 targeted by specific small interfering RMA (siRNA) suppressed MIR31HG overexpression in human immortalized keratinocytes (HaCaT), consistent with the effect of BAY11-7082 (BAY, NF-κB) on cytokine-induced MIR31HG expression. Additionally, the inhibition of MIR31HG also dampened HaCaT cell proliferation (Gao et al., 2018).
3.2.2 IgA nephropathy
IgA nephropathy (IgAN) is a chronic disease characterized by the deposition of IgA in the glomerular mesangium and is the most common glomerulonephritis worldwide (Saha et al., 2018; Pattrapornpisut et al., 2021). Expressed in human kidneys and participating in autoimmune diseases, more attention has been given to MIR31HG in recent years (Gupta et al., 2020). Through a study including 413 Chinese IgAN patients and 423 healthy people, several single nucleotide polymorphisms (SNPs) in MIR31HG, such as rs1332184 and rs55683539, were significantly associated with an increased risk of IgA nephropathy, creatively indicating that individuals with MIR31HG overexpression were likely to be more susceptible to IgAN (Yuan et al., 2020).
3.2.3 Hirschsprung’s disease (HSCR)
Known as a congenital disease with a disorder of the enteric nervous system, HSCR commonly occurs among children (Langer, 2013; Das and Mohanty, 2017). Cai et al. (2018) made a hypothesis that miR-31, miR-31*, and their host gene MIR31HG may participate in the pathogenesis of hirschsprung’s disease. Then, they found that the downregulation of MIR31HG could suppress cell migration and proliferation through the MIR31HG-miR31/31*-ITIH5/PIK3CG pathway. While the downregulation of MIR31HG, miR-31, and miR-31* is not associated with the cell cycle and apoptosis.
3.2.4 Rheumatoid arthritis
Rheumatoid arthritis (RA) is a chronic autoimmune disorder affected by multiple factors and mostly damages the joints (Smolen et al., 2016; Deane and Holers, 2021). Fibroblast-like synoviocytes (FLSs) the most abundant cell type in the joint synovium become inflamed and even invade bones in RA (Tu et al., 2018). Using specific siRNA to downregulate MIR31HG expression promoted cell proliferation, migration, and inflammation in RA-FLS. For clinical applications, tocilizumab could suppress RA-FLSs inflammation by targeting MIR31HG, indicating the protective role of MIR31HG in RA (Cao et al., 2021)
3.2.5 Osteonecrosis of the femoral head (ONFH)
Osteonecrosis of the femoral head is a complicated hip disability characterized by bone necrosis and usually occurs in young adults with an average age of 30–50 years old (Petek et al., 2019). Steroid use, alcohol abuse, and smoking are defined as common non-traumatic leading causes of ONFH (Wang et al., 2018b). Since previous studies have discovered that abnormal lncMIR31HG expression can affect osteogenic differentiation and that its polymorphism is correlated with radius bone mineral content in boys (Chesi et al., 2015). Two studies further investigated the MIR31HG gene variant in steroid-induced and alcohol-induced osteonecrosis. In one study including 708 Chinese Han volunteers, both age and sex were related to MIR31HG polymorphisms, and MIR31HG-rs10965059 was associated with a lower risk of bilateral steroid-induced osteonecrosis (Wang et al., 2022a). MIR31HG-rs10965059 and MIR31HG-rs10965064 were strongly associated with a lower risk of disease occurrence especially in patients over 40 years old and rs10965059 served as a protective gene in alcohol-induced osteonecrosis (Liu et al., 2022a). However, the precise mechanism by which MIR31HG participates in pathogenesis remains unclear.
4 The biological role of MIR31HG in human diseases
4.1 MIR31HG and the cell cycle
LncRNA MIR31HG has been revealed to control the cell cycle during human disease development. For instance, Ding et al. (2015) indicated that overexpression of MIR31HG may promote colorectal cancer cell arrest in the G0/G1 phase and induce apoptosis through the activation of specific caspase cleavage cascades. A study performed by Yang et al. (2016b) demonstrated that the knockdown of MIR31HG significantly induced G1/S arrest in pancreatic ductal adenocarcinoma (PDAC), whereas enhanced expression of MIR31HG had the opposite effects. Qin et al. (2018) also showed that downregulation of MIR31HG inhibited the proliferation of lung adenocarcinoma cells and blocked the G0/G1 to S-phase transition in cell cycle progression, but had no effect on cell apoptosis. In psoriasis, the silencing of lncRNA MIR31HG induced cell cycle arrest in the G2/M phase potentially via the mediation of siRNA (Gao et al., 2018).
4.2 MIR31HG and the EMT
Epithelial-to-mesenchymal transition (EMT) is a biological process by which polarized epithelial cells are transformed into highly motile mesenchymal cells (Thiery and Sleeman, 2006). Numerous types of research have proven that EMT plays an essential role in tumour progression and metastasis (Thiery, 2002; Hugo et al., 2007). Moreover, lncRNAs including HOTAIR, H19, ATB, and MIR100HG are commonly known as regulators that are involved in the EMT process (Dhamija and Diederichs, 2016). In particular, the lncRNA MIR100HG also acts as a host gene for miRNAs like MIR31HG, and a recent study emphasized its function as a positive regulator in EMT to advance colorectal cancer cell evasion and metastasis (Liu et al., 2022b).
Recent advances in sequencing technology have revealed that the lncRNA MIR31HG may serve as an oncogenic regulator in PDAC by promoting EMT. Transforming growth factor β (TGFβ) signalling plays dual roles in cancer progression, especially in the later stages of tumourigenesis. The high amounts of TGFβ secreted by cancer cells promote tumour progression by inducing EMT (Zhang et al., 2017a). Thus, Ko et al. (2022) found that the enrichment of TGFβ signalling in PDAC and the presence of MIR31HG enhanced TGFβ-induced EMT, suggesting that MIR31HG could serve as an oncogene in PDAC. Furthermore, as an epithelial marker, E-cadherin levels were found to be elevated, while mesenchymal signs such as Vimentin and transcription factors like Twist1 were remarkably downregulated in NSCLC cells through the silencing of MIR31HG (35). Patients with MIR31HG overexpression tend to share higher TGFβ and EMT gene expression in colorectal cancer, implying a potential relationship between MIR31HG and the EMT gene signature in other cancer types (Eide et al., 2019).
4.3 MIR31HG and senescence
Cellular senescence is an irreversible arrest of cell proliferation that occurs when cells experience potentially oncogenic stress. Because of its limitation on cellular fission, it is regarded as an anticancer mechanism (Kuilman et al., 2010; Storer et al., 2013). Cellular senescence mainly relies on two tumour suppressor pathways: p14ARF/p53 and p16INK4A/pRB. Several lncRNAs are involved in cellular senescence. By modulating SAFA-PANDA-PRC communication, lncRNA PANDA restricted the cell proliferative state and dampened cellular senescence. Conversely, the loss of PANDA promoted senescence, serving as an opportunity for dropping out of senescence (Kotake et al., 2011; Puvvula et al., 2014). Recent research has shown that the lncRNA MIR31HG is associated with oncogene-induced senescence (OIS) through various targets.
From Marta Montes’s study in 2015, MIR31HG was upregulated in OIS, and the knockdown of MIR31HG could induce a senescence phenotype. Moreover, this research has also demonstrated that the role of nuclear MIR31HG in senescence relies on p16INK4A since depleting p16INK4A can eliminate these effects. On the contrary, no evidence suggests that MIR31HG has a relationship with the p14ARF/p53 pathway in modulating senescence. The senescence-associated secretory phenotype (SASP) has been shown to either restrain or enhance tumour progression. Therefore, it is promising to find certain factors that could affect SASP without influencing the tumour-suppressive effects related to senescence at the same time for advanced therapies (Montes et al., 2015). In 2021, Marta Montes further discovered that cytoplasmic MIR31HG modulated the expression and secretion of SASP-related components by interacting with YBX1 to induce IL1A translation. In conclusion, the lncRNA MIR31HG both promotes and suppresses senescence, and these different effects mainly rely on MIR31HG localization, further indicating that inhibition of MIR31HG could potentially be used in senescence-related pathology therapies (Montes et al., 2021).
4.4 MIR31HG and cell differentiation
Numerous studies have shown the relevance of lncRNAs in cell differentiation (Richart et al., 2022; Wu et al., 2022). For example, the overexpression of lncRNA Snhg6 was found in tumour-derived myeloid-derived suppressor cells (MDSCs) and contributed to MDSC differentiation by inhibiting the ubiquitination of EZH2 (Lu et al., 2021). Recent studies have explored whether lncRNA MIR31HG participates in cell differentiation, especially in adipocyte and osteogenic differentiation.
According to Huang’s research, inhibition of MIR31HG suppressed adipocyte differentiation of human adipose-derived stem cells (hASCs) via histone modification of fatty acid binding protein 4 (FABP4) (Huang et al., 2017). FABP4 is a kind of protein that is highly expressed in adipose tissue and can be targeted for metabolic disease treatment (Haunerland and Spener, 2004). This research suggests potential determinants of the applications of MIR31HG in obesity and other disorders. Apart from participating in adipocyte differentiation, MIR31HG may play an important role in osteogenic differentiation. HASCs are a type of mesenchymal stem cell (MSC) capable of bone regeneration and repair, making them attractive in bone tissue engineering (Tapp et al., 2009). Upregulated by inflammatory cytokines such as TNF-α and IL-17 by the NF-κB Signalling pathway, MIR31HG inhibited osteoblast differentiation of hASCs. In contrast, the knockdown of MIR31HG could promote bone formation, demonstrating that the inhibition of MIR31HG benefits bone regeneration and relieves inflammation (Jin et al., 2016).
5 Mechanism of MIR31HG-mediated biological function in human diseases
5.1 The Wnt/β-catenin signalling pathway
Wnt/β-catenin is a family of proteins that play an important role in controlling embryonic and organ development, as well as cancer progression (Clevers and Nusse, 2012). The Wnt/β-catenin pathway is able to confine the transcription of downstream genes by activating the expression of β-catenin (Chatterjee et al., 2022). It was reported that a high level of MIR31HG contributes to the progression of a variety of cancers by activating canonical Wnt signaling, which is also recognized as the Wnt/β-catenin signalling pathway.
In contrast to some lncRNAs, MIR31HG is located mainly in the cytoplasm (Montes et al., 2015). Zheng et al. elucidated that the downregulation of MIR31HG depressed the Wnt/β-catenin signalling pathway via the inhibition of GSK3β and β-catenin expression levels but induced p-GSK3β overexpression in NSCLC cells. On the contrary, MIR31HG was demonstrated to enhance cell proliferation and invasion by activating this pathway in NSCLC (Zheng et al., 2019). The activation of the Wnt/β-catenin pathway was also found in glioblastoma (GBM) progression (Zhang et al., 2021). Triggered by STAT1, MIR31HG could transcribe β-catenin from the cytoplasm into the nucleus, and the Wnt/β-catenin pathway activator LiCl was utilized to invert both the ability to inhibit proliferation and impress apoptosis caused by MIR31HG knockdown in glioblastoma (Zhang et al., 2021). Therefore, we can safely conclude that the activation of the Wnt/β-catenin signaling pathway regulated by MIR31HG enhances cell growth in glioblastoma (Figure 3).
FIGURE 3
5.2 The AKT pathway
AKT kinases which are also called protein kinase B(PKB), are signalling molecules of cell growth and differentiation and the AKT pathway is commonly involved in inhibiting cell apoptosis and stimulating cell proliferation (Mundi et al., 2016; Stratikopoulos and Parsons, 2016). Among those AKT pathways, the PI3K (phosphatidylinositol 3-kinase)/AKT signaling pathway is one of the most prevalent and distinctive pathways related to growth, which modifies biological mechanisms in human diseases. For instance, the PI3K/AKT/mTOR (mammalian target of rapamycin) signalling pathway exerts an essential role in the tumourigenesis of malignant cancers (Barrett et al., 2012; Alzahrani, 2019). Moreover, phosphatase and tensin homolog (PTEN) is an important tumour suppressor that can dephosphorylate phosphatidylinositol (Birney et al., 2007; Gyamfi et al., 2022; Vervoort et al., 2022)-triphosphate (PIP3) to phosphatidylinositol 4,5-biphosphate (PIP2) and suppress the PI3K/AKT signalling pathway in various cancers (Bonneau and Longy, 2000). Many lncRNAs employ a cooperative effect as fine-tuners on both tumour inhibition and oncogenesis (Ghafouri-Fard et al., 2021). LncRNA FER1L4 evokes cell cycle arrest and AB073614 stimulates proliferation and hampers apoptosis; both of these processes are regulated by the AKT signalling pathway (Wang et al., 2019). Recently, several types of research have shown that the lncRNA MIR31HG may have a relationship with the AKT signalling pathway in various diseases (Figure 3).
In the case of NSCLC, Wang discovered that the overexpression of MIR31HG could not directly modify all epidermal growth factor receptor (EGFR), PI3K, or AKT levels but could affect the expression levels of P-EGFR, P-PIP3 and P-AKT. Research has elucidated that MIR31HG influences NSCLC cell proliferation, apoptosis, and the cell cycle by driving the EGFR/PI3K/AKT pathway, and even contributing to gefitinib resistance (Wang et al., 2017). The downregulation of P-PIP3 and P-AKT can also be seen in nasopharyngeal carcinoma (NPC) through MIR31HG silencing. In this study, silencing of MIR31HG decreased cell proliferation but promoted apoptosis; however, 740Y-P, a PI3K agonist successfully reversed this process. A positive correlation between MIR31HG and AKT expression levels was further demonstrated, suggesting that MIR31HG enhanced cell proliferation and induced apoptosis in NPC at the same time through the PI3K/AKT signalling pathway (Feng et al., 2022). RA-FLSs share several tumour cell-like characteristics with cancers, and a number of studies have demonstrated that PTEN may participate in RA-FLS formation. According to Cao’s study, MIR31HG and PTEN played roles as suppressive targets in RA-FLS inflammation regulated by mir214 and further motivated the AKT signalling pathway. Furthermore, the attachment of the PI3K inhibitor LY294002 remedied RA-FLS hyperinflammation induced by the loss of MIR31HG, suggesting that MIR31HG may serve as an upstream target for the AKT signalling pathway (Cao et al., 2021). In conclusion, MIR31HG inhibited proliferation, migration, and inflammation via regulation of the downstream miR-214-PTEN-AKT pathway. According to the gene set enrichment analysis (GSEA), MIR31HG may also contribute to colorectal cancer invasion and metastasis by modulating the PI3K-AKT-mTOR-signalling pathway (Wang et al., 2022b).
5.3 The lncRNA-miRNA-mRNA ceRNA network
Apart from the two pathways described above, MIR31HG also acts on a series of targets and participates in other pathways. The competing endogenous RNA (ceRNA) regulatory network is the main mechanism of MIR31HG in cancer development (Li and Zhan, 2019). Through ceRNA mechanisms, MIR31HG could act as a miRNA sponge to regulate the expression of downstream messenger RNAs (mRNAs), and affect tumour progression (Figure 1).
MIR31HG serves as an oncogene in cervical carcinoma by acting as a sponge for miR-361-3p to modulate the miRNA target EMP1 (Li, 2020). In colorectal cancer, miR-361-3p was inhibited by MIR31HG which thereby increased the YY1 level, contributing to tumour progression (Guo et al., 2021). By sponging miR-34a, MIR31HG enhances the expression of c-Met and promotes the development of ESCC (Chu et al., 2020). In hepatocellular carcinoma, FOX3-induced lncRNA LOC554202 upregulated BSG by competitively binding to miR-485-5p and promoted tumour progression (Yang et al., 2022b). In addition, MIR31HG inhibited hepatocellular carcinoma (HCC) proliferation and metastasis by directly binding miR-575 to positively modulate the expression of ST7L (Yan et al., 2018). MiR-31 is suppressed by the lncRNA MIR31HG in various cancers, including chordoma and LSCC. MIR31HG plays a crucial role in the progression of chordoma by indirectly promoting RNF144B via miR-31 (Ma et al., 2017). In LSCC, MIR31HG acted as an oncogene directly by inhibiting miR-31 expression and promoting its target gene RhoA expression (Yang et al., 2018). The modulation function of MIR31HG in regulating MAPK1 expression was completed by competitively sponging miR-761 in thyroid cancer (Peng et al., 2022). Furthermore, overexpression of MIR31HG promoted tumour growth in osteosarcoma cells by downregulating miR-361 expression and elevating the expression of VEGF, FOXM1 and Twist, which are target genes of miR-361 (Sun et al., 2019). Sp1-activated-MIR31HG advanced cell migration and invasion by directly binding to miR-214 in NSCLC (Dandan et al., 2019). According to the latest research from Mo’s team, MIR31HG serves as an oncogene by targeting mir-193a-3p and positively enhances recombinant tumor necrosis factor receptor superfamily, member 21 (TNFRSF21) expression in lung adenocarcinoma (Mo et al., 2022). In pancreatic ductal adenocarcinoma, lncMIR31HG exhibited oncogenic properties through the downregulation of miR-193b (Yang et al., 2016b).
5.4 Interaction with hypoxia-inducible factor 1α (HIF-1α)
Hypoxia-inducible factor 1α (HIF-1α) is the HIF-1 transcription factor and can modulate the expression of hypothetical genes (LaGory and Giaccia, 2016). As hypoxia induction can cause tumour metastasis and lead to worse prognosis, a number of studies have demonstrated the role of the HIF-1α pathway in cancer development in recent years (Zhou et al., 2015; Wu et al., 2017). In a recent review, upregulated lncRNAs including HOTAIR, H19, and MALAT1 were found and concluded to be hypoxia-responsive lncRNAs in cancers (Wang et al., 2021b). Similar to LncH19, lncMIR31HG was also induced by hypoxia and was subsequently named lncHIFCAR (long non-coding HIF-1α coactivating RNA) (Shih et al., 2017).
Through a previous integrated analysis of the expression of lncRNA-mRNA in advanced LSCC, lncMIR31HG was positively related to HIF-1α (Wang et al., 2018a). Western blotting further proved that the knockdown of MIR31HG inhibited HIF-1α expression and increased P21 expression. Moreover, in oral cancer, MIR31HG directly binds with HIF-1α and forms a special complex (Shih et al., 2017). This complex recruits HIF-1α and its coactivator p300, contributing to the overexpression of MIR31HG and activation of the HIF-1α pathway. Surprisingly, even under normoxic conditions, MIR31HG still enhanced the target genes of HIF-1α, indicating that MIR31HG could serve as a HIF-1α coactivator. Unfortunately, studies on lncMIR31HG and HIF-1α were only conducted before 2020 and the specific mechanisms were unclear.
6 MIR31HG as a potential biomarker in human diseases
6.1 MIR31HG as a diagnostic biomarker
Multiple kinds of research have elucidated that long non-coding RNAs participate in human diseases (Yang et al., 2022a; Hao et al., 2023). In view of the aberrant expression level, wide functions and gradually displayed underlying mechanisms, we will further discuss that lncRNA MIR31HG acts as a potential diagnostic biomarker in human cancer and non-cancers.
Differential expression of MIR31HG in specific tissues in cancers helps to distinguish diseased tissues from normal tissues, indicating that MIR31HG could be a potential biomarker for early cancer diagnosis (Ren et al., 2017; Yan et al., 2018). Apart from cancer diagnosis, the latest research focuses on the diagnostic role of MIR31HG in human non-cancers. Genetic factors play a crucial role in the development of lumbar disc herniation (LDH), which is a common spinal disease that poses a great threat to human health both worldwide and in China (Deyo and Mirza, 2016; Zhang et al., 2017b). By performing a multifactor dimensionality reduction (MDR) analysis, individuals with the MIR31HG polymorphism rs10965059 were found to be at great risk of LDH providing the possibility for early screening, prevention and diagnosis of Chinese Han LDH high-risk populations (Hu et al., 2022).
6.2 MIR31HG as a prognostic biomarker
Numerous studies have revealed that MIR31HG is positively related to clinicopathological features, including tumour size, clinical stage, TNM stage, advanced T category, lymph node metastasis, distant metastasis, overall survival, and progression-free survival (Table1). These clinical features elucidate the possibility that MIR31HG could serve as a prognostic biomarker in human cancer. For example, downregulation of MIR31HG in colorectal cancer was significantly associated with TNM stage, histologic grade, and lymph node metastasis, indicating that MIR31HG expression was linked with poor prognosis in CRC (Yang et al., 2016a). In oral squamous cell carcinoma, MIR31HG overexpression is related to a worse survival tendency in stage IV diseases (Tu et al., 2022). Furthermore, we conducted a survival analysis of MIR31HG in 21 kinds of human cancers using the Oncolnc database (http://www.oncolnc.org) (Figure 4). All data used for analysis in this database came from TCGA, and a log-rank p-value less than 0.05 was viewed as a great difference. LncRNA MIR31HG has a relationship with the OS of patients with breast invasive carcinoma (BRCA), lung cancer, colorectal cancer, glioblastoma, kidney renal clear cell carcinoma (KIRC) and uterine corpus endometrial carcinoma (UCEC). In breast cancer, a higher level of MIR31HG was associated with longer OS, while in other cancers, its overexpression was related to a worse outcome. This analysis suggested the potential role of MIR31HG in predicting cancer prognosis. Nevertheless, research has yet to systematically investigate the association between MIR31HG and human non-cancer.
FIGURE 4
6.3 MIR31HG as a therapeutic reagent
Drug resistance is a leading obstacle to human disease treatment (Vasan et al., 2019). With further research on the mechanisms involved in lncRNA-related disease pathogenesis, lncMIR31HG could be a promising biomarker for specific disease treatments. In NSCLC patients with EGFR mutations, LOC554202 reduced the sensitivity of NSCLC cells to gefitinib and promoted gefitinib resistance by regulating mir31 expression (He et al., 2019). For colorectal patients who have been treated with oxaliplatin-based chemotherapy, higher expression levels of LOC554202 were associated with DFS and OS rates. This result suggested that LOC554202 may be a potential marker for evaluating the outcome of colorectal cancer therapy (Li et al., 2018).
Tissue inflammation is one of the classic symptoms of RA (Buch et al., 2021). For treating moderate to severe RA in adults, either utilizing tocilizumab alone or in combination with other doses was viewed as a common therapy. MIR31HG, targeted by tocilizumab, was indicated to suppress RA-FLS inflammation and become a potential therapeutic target for RA in Cao’s study (Cao et al., 2021).
7 Conclusion and perspective
Plenty of existing evidence shows that lncRNA play an important role in the pathogenesis of human diseases. With further study of lncRNAs in human cancer, it is worth exploring and concluding the role of lncRNAs in tumour development. In this review, we summarize the current research on the role of MIR31HG in human cancer and non-cancer. MIR31HG gene polymorphism is associated with susceptibility to several diseases and plays an oncogenic role or acts as a tumour suppressor by regulating tumour cell proliferation, apoptosis, the cell cycle, EMT, and senescence. MIR31HG also participated in the differentiation of hASCs in non-cancer. These effects are realized by diverse mechanisims, such as the Wnt/β pathway, the AKT pathway, the lncRNA-miRNA-mRNA ceRNA network and interaction with HIF-1α (Figure 3).
MIR31HG, upregulation or downregulation, may act as a biomarker for the prognosis and diagnosis of cancer. Moreover, the dysregulation of MIR31HG in various cancers is significantly related to important clinical features including tumour size, TNM staging, histological grade, OS, and DFS (Table1). For human disease treatment, MIR31HG also serves as a therapeutic target for different diseases including NSCLC, colorectal cancer, and RA.
In conclusion, the lncRNA MIR31HG participates in the pathogenesis of human diseases and has great potential for clinical application by functioning as a diagnostic or prognostic biomarker and therapeutic target in human diseases.
However, there are some limitations in those studies. First, controversy still exists regarding the specific MIR31HG expression level in certain cancers, such as breast cancer, colorectal cancer, bladder cancer and ESCC. These expression differences may be the consequence of the diverse cell lines used and the specific patients selected. Second, in cancers such as PDAC and NPC, only one or two studies have depicted the role of MIR31HG in their development. The lack of multiple experiments can mislead our cognitions and obtain controversial results.
Although it has been shown that MIR31HG is also dysregulated in non-cancers, those studies are merely limited to cell line studies and in silico analysis. More animal experiments and clinical research are needed in the future. To date, MIR31HG has been shown to participate in only five human non-cancers, far less than its participation in cancers. Whether lncMIR31HG plays an important role in human non-cancer pathogenesis needs more solid support in wider types of diseases.
Functional experiments show that lncMIR31HG affects human diseases through four main mechanisms. However, the related mechanistic pathways remain in their primary stage, especially in the WNT pathway. Moreover, current studies mostly focus on the investigation of MIR31HG downstream regulators, and other studies on its upstream genes or regulators should be performed in the future. In addition, the lncRNA MIR31HG is correlated with drug resistance and treatment outcomes in cancers. However, its clinical value in non-cancers is not clear. Consequently, further high-equality experiments and credible clinical research are required to explore the latent value underlying MIR31HG in disease pathogenesis and treatment.
Statements
Author contributions
QZ and JW provided ideas for this review. LR wrote the manuscript. YY and JL drew the tables and figures. HL and HY revised this manuscript. All authors contributed to the article and approved the submitted version.
Funding
This work was funded by the Graduate Research and Innovation Projects of Jiangsu Province (SJCX22_0657).
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
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.
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Summary
Keywords
MIR31HG, long non-coding RNA, expression, biological function, signalling pathways
Citation
Ruan L, Lei J, Yuan Y, Li H, Yang H, Wang J and Zhang Q (2023) MIR31HG, a potential lncRNA in human cancers and non-cancers. Front. Genet. 14:1145454. doi: 10.3389/fgene.2023.1145454
Received
16 January 2023
Accepted
31 July 2023
Published
10 August 2023
Volume
14 - 2023
Edited by
Yujing Li, Emory University, United States
Reviewed by
Hsifeng Tu, National Yang-Ming University, Taiwan
Feng Wang, Emory University, United States
Cuida Meng, Jilin University, China
Updates
Copyright
© 2023 Ruan, Lei, Yuan, Li, Yang, Wang and Zhang.
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: Quanan Zhang, quananzhang_doctor@163.com
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