Roles and regulatory mechanisms of miR‑30b in cancer, cardiovascular disease, and metabolic disorders (Review)
- Authors:
- Published online on: November 17, 2020 https://doi.org/10.3892/etm.2020.9475
- Article Number: 44
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Copyright: © Zhang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
Abstract
1. Introduction
MicroRNAs (miRNAs) are endogenous short-chain RNAs 21-23 nucleotides in length that regulate posttranscriptional gene expression (1). A series of biogenetic processes convert transcripts into mature miRNAs (2). Briefly, miRNA-encoding genes are first transcribed into pri-miRNAs that are digested by Drosha and Dicer enzymes to produce mature miRNAs (3,4). Subsequently, mature miRNAs are assembled into RNA-induced silencing complexes (RISC) (5). RISC recognize complementary bases, and either degrade the target mRNAs or inhibit their expression depending upon the degree of complementarity (6,7). miRNAs regulate translation through both direct and indirect mechanisms (8).
miRNAs serve important roles in cell proliferation, differentiation, apoptosis and other biological processes (2,9). Furthermore, miRNAs affect various metabolic pathways, including lipid, glucose and bone metabolism (10-12), and pathophysiological dysregulation of miRNAs may result in oncogenesis and tumor progression (13). miR-30b, a member of the miR-30 family, has been implicated in the pathogenesis of multiple diseases, including various types of cancer, diabetes, and cardiovascular, renal and neurological disorders (14-19). In the present review, the current body of literature regarding the role of miR-30b in diverse range of diseases, particularly cancer, cardiovascular diseases and metabolic disorders is summarized.
2. Biological function of miR-30b
In this section, the biological function of miR-30b in the physiology of cell differentiation and development, autophagy and inflammation is summarized. miR-30b is an important modulator of cell differentiation and development. miR-30b was shown to downregulate chondrogenic differentiation induced by TGF-β3 in murine embryonic stem cells (C3H10T1/2) by targeting SOX9(20) and promoted the growth of retinal ganglion axons by inhibiting the expression of Semaphorin3A in a murine model of optic nerve injury (21). During angiogenesis, miR-30b overexpression stimulated the TGF-β2 signaling pathway, thus inhibiting capillary formation; whereas miR-30b inhibition promoted angiogenesis (22).
Autophagy is a cellular recycling process that is highly conserved amongst eukaryotes (23). Vesicles transport cargos to lysosomes for degradation and recycling (24). The role of miR-30b in autophagy has been investigated in several studies. In a murine model of hepatic ischemia reperfusion injury (IRI), miR-30b inhibited autophagy and attenuated the consequent severity of IRI by reducing Atg12-Atg5 conjugates (25). miR-30b was also shown to regulate autophagy in vascular smooth muscle cells; overexpression reduced the expression of autophagy-related genes such as BECN1, ATG5 and LC3b, whereas miR-30b downregulation increased their expression (26). In an in vitro model of TNF-α-induced chondrocyte injury, miR-30b directly inhibited the expression of autophagy-related genes BECN1 and ATG5, whereas its reduced expression increased cell survival and attenuated cartilage degradation (27). In summary, miR-30b possesses significant functions in the physiology of autophagy that should be explored in additional diseases.
miR-30b also serves a critical role in inflammation. This includes regulation of the physiological function of macrophages/dendritic cells, Fc receptor-mediated phagocytosis, antigen processing, cytokine production and related innate immune responses (28-30); as well as the regulation of cell-mediated responses by mediating T cell expression of IL-10 and Toll-like receptor 4(31); and the control of humoral immunity by inhibitng B cell expression of kynurenine-regulated lipopolysaccharide by targeting the Bach2 gene (32). In a rat model, the upregulation of miR-30b was shown to directly impact peritoneal fibrosis through a BMP7-mediated pathway (33). Although miR-30b function has been studied in multiple immune effector cell subtypes as described above, its role in the regulation of immune response is only partially understood and requires further study.
3. Role of miR-30b in cancer
The role of miR-30b has been studied in various malignancies, including pancreatic, gastric, and lung cancer; where it is involved in the regulation of multiple processes such as cell proliferation, differentiation, apoptosis, invasion and metastasis (Fig. 1). In addition, miR-30b serves a pivotal role in epithelial-mesenchymal transition (EMT), a phenotypic conversion that is characterized by reduced expression of epithelial markers and upregulation of mesenchymal markers in cancer stem-like cells during carcinogenesis. miR-30b inhibits Snail-mediated EMT and the consequent migratory and invasive capacity of pancreatic cancer stem cells and hepatoma cells (34,35). Paradoxically, miR-30b can function as either an oncogene or tumor suppressor gene dependent on the type of cancer, as discussed in detail in further chapters (Table I).
Role of miR-30b in gastric cancer
Gastric cancer is one of the most common malignancies and is the second leading cause of cancer-related death worldwide (36). Invasion and metastasis are major causes of mortality (37). In a 2014 study, decreased expression of miR-30b-5p was observed in gastric cancer tissue and in 4 gastric cancer cell lines, and was shown to be correlated with lymph node metastasis (38). Zhu et al (15) suggested that miR-30b promoted apoptosis and inhibited tumorigenesis by downregulating plasminogen activator inhibitor-1 (PAI-1). Tian et al (39) showed that miR-30b inhibited tumor migration and invasion in AGS and MGC803 cells, two gastric cancer cell lines, by targeting the synthesis of EIF5A2, an oncogenic protein that serves a fundamental role in EMT. Xi et al (40) reported that upstream regulator of miR-30b, lncRNA MALAT1, enhanced autophagy and cisplatin resistance in the gastric cancer cell line AGS/CDDP by inhibiting the miR-30b/ATG5 axis. In summary, miR-30b may act as a tumor suppressor gene in gastric cancer.
Role of miR-30b in hepatocellular carcinoma
Numerous studies have shown an association between dysregulated miR-30b expression and hepatocellular carcinoma (HCC). Huang et al (41) demonstrated that miR-30b expression was significantly lower in HCC compared with the para-cancerous tissue. miR-30b was also shown to regulate the expression of CD90, resulting in inhibition of HCC progression. Sun et al (35) found that miR-30b inhibited EMT and metastasis in HCC. Qin et al (42) reported that miR-30b-5p inhibited proliferation and slowed cell cycle progression of HCC by targeting DNMT3A and USP37. In addition, miR-30b influenced HCC recurrence and prognosis. Huang et al (41) showed there was an association between high expression of miR-30b and relapse-free survival. miR-30b expression was shown to affect hepatic metastasis; Hur et al (43) reported that miR-30b was upregulated in liver metastases compared with primary tumors. In addition, miR-30b may serve as a prognostic biomarker (44). miR-30b expression can accurately predict metastasis-free and hepatic metastasis-free survival (45) and the risk of recurrence (46).
miR-30b may also mediate drug resistance in HCC, although its specific role is contested (47,48). Moreover, miR-30b-mediated pathways may serve as potential novel therapeutic targets. Yeh and Huang (49) used two methods (jetPEI/anti-miR-30b complexes and a miR-30b antagonist) to deliver anti-sense miR-30b in a murine J7 tumor xenograft model of HCC and found that both methods inhibited tumor growth when compared with the controls. However, the specific roles of miR-30b in oncogenesis and drug resistance require further study.
Role of miR-30b in colorectal cancer
Colorectal cancer (CRC) is one of the most prevalent types of cancer of the digestive system in western countries and is the third leading cause of cancer-related death worldwide (50). Yilmaz et al (51) found that miR-30b expression was decreased in CRC tissues, and Yoon et al (52) showed that miR-30b suppressed the invasiveness of CRC cell lines. The inhibitory role of miR-30b in CRC may be due to targeting of KITENIN, KRAS, PIK3CD, BCL2, SIX1 and Snail (43,53-56). Although these findings suggest a suppressor role of miR-30b in CRC, to the best of our knowledge, no studies have addressed the potential therapeutic value of miR-30b in CRC. Thus, studies investigating its therapeutic utility in CRC are required.
Role of miR-30b in non-small cell lung cancer (NSCLC)
Lung cancer is the leading cause of cancer death worldwide (57). Previous studies have suggested that miR-30b expression is downregulated in non-small cell lung cancer primary tumors (58) and that it inhibits proliferation, invasion and migration of NSCLC cells by targeting Cthrc1, Rab18 and EGFR (59,60). These findings suggest that miR-30b upregulation may serve as a therapeutic strategy, and this has been attempted using radiation therapy; low-dose pretreatment was used to increase miR-30b expression, thereby inhibiting PAI-1 activity and improving the clinical response to full-dose radiation (61).
In contrast to its reduced expression in lung tumors, miR-30b levels are increased in circulating extracellular vesicles in patients with NSCLC (62), highlighting its potential use as a diagnostic and prognostic biomarker. High serum concentrations of miR-30b and miR-30c are associated with a reduction in both progression-free and overall survival (63). In addition, miR-30b expression is a useful predictor of a patient's response to first-line tyrosine-kinase inhibitors (TKIs) (64).
The role of miR-30b in drug resistance in patients with lung cancer is less clear. The targeting of the epidermal growth factor receptor (EFGR) pathway by miR-30b enhanced the in vitro sensitivity of NSCLC cells to EGFR-TKIs (65). However, Garofalo et al (66) showed an association between increased expression of EGF and hepatocyte growth factor receptors with upregulated miR-30b expression and resistance to the EGFR-TKI gefitinib. Silencing of Dicer downregulated miR-30b/c and miR-221/222 expression, increased capsase-3 expression and restored gefitinib sensitivity (67). miR-30 also serves a fundamental role in cisplatin resistance. miR-30 inhibition reduces the clonogenic survival of CisR cells in vitro when treated with cisplatin (68).
Role of miR-30b in bladder cancer
Bladder cancer is a common urogenital malignancy, with high mortality rates and a 70% recurrence rate (69). Wszolek et al (70) found that the expression of miR-30b in invasive bladder cancer was downregulated compared with normal tissues. However, Mahdavinezhad et al (71,72) found that 64% of bladder cancer tissues possess high levels of miR-30b compared with normal tissues. A study in the USA showed elevated expression of miR-30b in the urine of patients with high-grade urothelial carcinoma (73), whereas two other studies from the USA and the Czech Republic showed significantly reduced urine miR-30b levels in patients with bladder cancer (70,74). Therefore, the role of miR-30b in bladder cancer is unclear and should be investigated further. However, miRNAs may possess potential value as biomarkers for the early diagnosis of bladder cancer, and can also supplement histopathological diagnosis (75), and urine samples may serve as an easily accessible clinical specimen to study this biomarker (76).
Role of miR-30b in breast cancer
Breast cancer is the most commonly diagnosed cancer and the leading cause of cancer-related death in women (77). The expression of miR-30b is lower in breast cancer tissues than in normal tissues (78). However, Zhang et al (79) found that miR-30b levels were upregulated in the blood of patients with breast cancer, even during the very early-stages of the disease. In 2015, Ribas et al (80) studied 1,302 subjects from the European genomic archives and found that miR-30b expression was lower in younger patients (<35 years old) compared with the older group. miR-30b may also inhibit bone metastasis by targeting numerous genes related to osteoclast stimulation (such as IL-8 and IL-11), osteoblast inhibition (DDK-1), tumor cell osteogenesis (RUNX2 and CDH11) and invasion (CTGF, ITGA5 and ITGB3) (81).
Luo et al (82) developed an assay for the early diagnosis of breast cancer that measured levels of four downregulated miRNAs (miR-451, miR-148a, miR-27a and mi-R-30b) and was able to distinguish patients with breast cancer from the healthy controls based on the expression of these four miRNAs.
A miRNA-mediated PI3K pathway serves a central role in trastuzumab resistance (83). PI3K pathway inhibitors resulted in reduced miR30b expression and re-sensitization to trastuzumab in the trastuzumab resistant HCC1954 cells (84).
Role of miR-30b in other types of cancer
miR-30b has been shown to serve as a regulatory factor in other malignancies, including pancreatic (85), esophageal (86,87) and renal cell carcinomas (88), lymphoma (89,90), glioma (91-94) and parathyroid (95), laryngeal (96) and gallbladder carcinoma (97). The role of miR-30b in these types of cancer has been evaluated in a relatively small number of studies, and the results are summarized in Table I.
4. Role of miR-30b in cardiovascular disease
Cardiovascular disease remains the leading cause of morbidity and mortality worldwide (98). In rat models, miR-30b expression was shown to be downregulated in myocardial IRI, whereas upregulation attenuated cardiomyocyte apoptosis (14,99) by targeting KRAS and activating the Ras/Akt pathway (14). Li et al (100) suggested that miR-30b reduced homocysteine-induced apoptosis in coronary endothelial cells by downregulating the expression of caspase-3. miR-30b expression was decreased in the peripheral blood of patients with acute myocardial ischemia (AMI) and in the peripheral blood and myocardial tissue in an AMI murine model (99). Based on the murine model, it was also suggested that miR-30b exerted a myocardial protective effect by targeting PAI-1(101).
By contrast, Shen et al (102) reported that miR-30b expression was upregulated in a murine model of myocardial infarction and primary cardiomyocyte hypoxia models and was associated with ischemic injury. A study in the USA reported that miR-30b may promote cardiomyocyte death by targeting Bcl-2, and that inhibiting miR-30b reduced Ang II-induced myocardial cell apoptosis (103). A role for miR-30b in atherosclerosis was suggested based on the levels of miR-30b in the blood of patients with coronary artery disease (92). miR-30b may inhibit the proliferation and apoptosis of human coronary endothelial cells by targeting ITGA4(104).
5. Role of miR-30b in metabolic disease
Numerous studies have shown an association between miR-30b and several metabolic diseases, such as obesity, diabetes and non-alcoholic fatty liver disease (NAFLD). Kim et al (105) found that miR-30b levels were reduced in the serum and visceral adipose tissue of obese subjects. miR-30b was downregulated in subcutaneous adipose tissue of subjects with insulin resistance (106). Stepien et al (107) found that miR-30b was upregulated in circulating exosomes of patients with type 2 diabetes mellitus (T2DM). Zang et al (108) showed reduced expression of miR-30b in the urinary exosomes of patients with T2DM and diabetic kidney disease (DKD) compared with subjects with T2DM without DKD (108). miR-30b was shown to regulate insulin sensitivity in a rat model of NAFLD by targeting SERCA2b and the serum levels of miR-30b were also positively correlated with hepatic steatosis and insulin resistance in a cohort of 165 Chinese individuals (109). A Spanish study found that hepatic miR-30b levels were upregulated in obese patients with NAFLD compared with patients with uncomplicated obesity (110). Further research is required to clarify the roles and mechanisms of miR30b in metabolic diseases, and to explore its potential clinical utility as a diagnostic analyte and drug target.
6. Conclusion
A growing body of research has shown that a range of functions are mediated by miR-30b in the pathogenesis of numerous diseases, including cancer, cardiovascular disease and metabolic disorders. These include the modulation of cell proliferation, autophagy, invasion, migration and EMT in cancer; apoptosis in myocardial ischemia, and NAFLD in insulin insensitivity. Although progress has been made, the current state of knowledge of the functions of miR-30b is still incomplete. Studies of the roles of miR-30b have yielded inconsistent results that may be related to different sample types and the demographics of the study subjects. The current body of literature suggests that miR-30b offers significant clinical potential as a diagnostic and/or prognostic biomarker, therapeutic agent and drug target. Further research is required to elucidate its role in health and disease and to harness its potential clinical utility.
Acknowledgements
The authors thank Ms Jie Tan of Weifang Medical University, Weifang, China for her assistance with literature collection for this study.
Funding
This study was supported by a grant from the National Natural Science Foundation of China (grant no. 31770837).
Availability of data and materials
Not applicable.
Authors' contributions
Study concept and design: YNX. Acquisition and analysis of data: QZ, SSL, JZ, XFM, MZD and BKS. The drafting and writing of the manuscript: QZ and SSL. The revision of the manuscript: YNX. All authors read and approved the final manuscript.
Ethics approval and consent to participate
Not applicable.
Patient consent for publication
Not applicable.
Competing interests
The authors declare that they have no competing interests.
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