Abstract
Distant metastasis is the main cause of death for cancer patients. Recently, the newly discovered programmed cell death includes necroptosis, pyroptosis, and ferroptosis, which possesses an important role in the process of tumor metastasis. At the same time, it is widely reported that non-coding RNA precisely regulates programmed death and tumor metastasis. In the present review, we summarize the function and role of necroptosis, pyrolysis, and ferroptosis involving in cancer metastasis, as well as the regulatory factors, including non-coding RNAs, of necroptosis, pyroptosis, and ferroptosis in the process of tumor metastasis.
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Facts
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Programmed cell death has included apoptosis, autophagy-related cell death, necroptosis, ferroptosis, and pyroptosis.
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Induction of programmed death of tumor cells exerts a vital role in the clinical treatment of cancer metastasis.
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Non-coding RNA has participated in mediating multiple processes in tumor metastasis. At the same time, it has been found the non-coding RNAs have functions in regulating programmed death during cancer metastasis.
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The interaction of necroptosis, pyroptosis, and ferroptosis is mediated by several key proteins such as NEK7, Tom20, caspase 1, etc.
Open questions
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1.
How non-coding RNAs regulated the interactions between ferroptosis and necroptosis, ferroptosis, and pyroptosis?
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The role of miRNAs, lncRNAs, or circRNAs regulated programmed cell death was not clearly clarified in the metastasis of cancers.
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Is it a promising strategy in clinical cancer treatment to induce programmed cell death and identify the exact function of non-coding RNAs in the clinical therapy of cancers?
Introduction
The metastasis of malignant tumors is the main reason for the failure of tumor therapy. Metastasis promotes cancer progression by degrading the extracellular matrix (ECM), mediating epithelial-to-mesenchymal transition (EMT), promoting tumor angiogenesis, etc. [1, 2]. This process is a complex molecular event involving multiple steps, multiple genes, and multiple cells [3]. Programmed cell death is an autonomous and orderly death. Apoptosis is often considered to be the traditional method of cell death. Now, programmed cell death has included apoptosis, autophagy, necroptosis, ferroptosis, and pyroptosis. Induction of programmed death of tumor cells exerts a vital role in the clinical treatment of cancer metastasis.
Metastatic tumor cells normally spread from the primary site, through lymphatics, blood vessels, or body cavities, and then colonize remotely, establish a local living environment, and continue to grow and infiltrate [4]. In recent years, non-coding RNA has participated in mediating multiple processes in tumor metastasis, such as epithelial–mesenchymal cell transformation and tumor angiogenesis [5]. Non-coding RNA mainly includes small nuclear RNA (snRNA), micro-RNA (miRNA), small interfering RNA (siRNA), piwi-interacting RNA (piRNA), small nucleolar RNA (snoRNA), circular RNAs, and lncRNAs [6]. Coding RNAs regulate gene expression during tumor development and metastasis through different pathways. At the same time, it has been found the non-coding RNAs have functions in regulating programmed death during cancer metastasis.
As we have summarized the regulatory mechanism of apoptosis and autophagy on tumor metastasis previously, the role of these two kinds of programmed death in tumor metastasis will not be repeated. This article mainly summarizes the role and regulatory mechanism of necroptosis, pyroptosis and ferroptosis in progression of tumor metastasis, and the regulation process of non-coding RNA on necroptosis, pyroptosis, and ferroptosis. At the same time, the relationship among necroptosis, pyroptosis and ferroptosis and some unresolved problems in the process of cancer metastasis was discussed, hoping to provide reference information for more in-depth theoretical and applied research in this field in the future.
Necroptosis and cancer metastasis
Necroptosis signaling pathway
Necroptosis is a caspases-independent cell death mode discovered recently [7]. The morphological characteristics of necroptosis cells are including incomplete cell membranes, crisis of intracellular energy metabolism, and release of inflammatory factors. Necroptosis is important in the development of various inflammatory diseases, neurodegenerative diseases, ischemic cardiovascular, cerebrovascular diseases, etc., as well as the metastasis of cancers. Necroptosis has been proved to have a dual effect in cancer: firstly, the key regulators of the necroptosis can promote the metastasis and progression of cancer alone or in combination; on the other hand, necroptosis can also play as a kind of “insurance”, it can prevent tumor development and metastasis when apoptosis is damaged. Considering the key function of necroptosis in the development of cancers, necroptosis is considered to be a new cancer treatment. It is reported that more and more drugs and compounds are inducing necroptosis to resist cancer. Studies have found that necroptosis is closely regulated by intracellular signal factors, such as the tumor necrosis receptor factor (TNFR) superfamily, pattern recognition receptors (PRRs), T cell receptors (TCRs), various chemotherapy drugs, etc. [8]. Among them, kinase receptor-interacting protein kinase (RIP) 1 and RIP 3 are important regulatory factors [9]. In addition, necroptosis can also be specifically inhibited by necrostatin-1 (Nec-1) [10].
First, necroptosis is initiated by the interaction of TNF and TNFR1, which induces the structural changes and formation of TNFR1 trimer, leading to the combination of RIP1, TNF receptor-related death domain (TRADD), cIAP1 (intracellular apoptosis). Apoptosis protein inhibitor 1) and cIAP2, TNF receptor-related factor 2 (TRAF2), and TRAF5 recruitment, this multimeric protein complex bound to the cell membrane is called complex I. In this complex, RIP1 is a key factor in cell regulation, which can be ubiquitinated by cIAP1/2, which in turn induces the activation of the classic NF-κB pathway and promotes cell survival. At the same time, RIP1 can also be deubiquitinated by CYLD, the NF-κB pathway is restricted, and the trend toward cell death pathway. Therefore, a cell death-inducing signal complex composed of RIP1, TRADD, caspase-8, and FAS-related death domain (FADD) is formed, called complex II, also called “nucleosome”, the formation of caspase-8 can induce the activation of caspase-8. Complex II involves the activation of the apoptotic and the necroptotic pathway. In complex II, activated caspase-8 cleaves RIP1 and RIP3, thereby inactivating them and moving to the apoptotic pathway, causing the cells to perform the apoptosis program [11]. When the activity of caspase-8 is inhibited, the shearing of RIP1 is blocked, necrosis of the key complex of pyroptosis is formed, and the cell death pathway directly shifts to necroptosis [12]. RIP1 is activated by phosphorylation at its N-terminus through serine residue 161. Activated RIP1 interacts with RIP3 to form a necrosome. Necrosome is an important key molecule in necroptosis. RIP3 activates its substrate MLKL, translocates to the cell membrane for necroptosis, changes the permeability of the cell membrane, and ultimately leads to cell death.
Necroptosis in cancer metastasis
Necroptosis is important in the modulation of cancer metastasis, but the role of necroptosis is a dual role at different stages of cancer metastasis. In the early stage of distant colonization, the tumor cells spread via the circulatory system, in which tumor-cell-induced endothelial cell necroptosis promotes extravasation and metastasis [13] (Table 1). Another study showed that suppressing EMT was one effective way to inhibit invasion of radioresistant cancers, and inhibition of necroptosis such as depleting MLKL expression suppresses invasion of radioresistant nasopharyngeal carcinoma cells by suppressing EMT [14]. Moreover, knockdown aurora A-induced necroptosis which contributed to the increased survival times of mice with orthotopic KPC pancreatic ductal adenocarcinoma cancer (PDACs), and reduced tumor growth and metastasis [15]. Meanwhile, RIPK1 kinase inhibitors significantly repressed metastasis of both lung cancer cells and melanoma cells[16]. Additionally, it has been found RIP1 and MLKL are both positively associated with cancer parameters including N-cadherin, and suppressing necroptosis inhibited the metastasis of breast cancer [17]. Endothelial TGF-beta-activated kinase 1 (TAK1)-deficiency correlated with increased necroptosis and metastasis of endothelial cells. While others believe that the agents such as resibufogenin inhibit the occurrence and metastasis of colorectal cancer by RIP3-mediated necroptosis [18]. Additionally, sometimes, necroptosis of cancer cells possesses suppression in metastasis by activating anti-tumor immune responses to release damage-associated molecular patterns (DAMPs). While it also participates the adaptive immune suppression to promote tumor metastasis [19]. Thus, the role of necroptosis to regulate cancer metastasis appears to be controversial and highly dependent on the tumor stage.
ncRNAs regulate necroptosis
Recently, induction of necroptosis is thought to be an effective way to eliminate apoptosis-resistant cancer cells. Some compounds or natural products induce necroptosis and also inhibit the invasiveness of osteosarcoma cells [20]. Here, we mainly summarized the regulation process of non-coding RNA on necroptosis, hoping to provide a reference for researchers in cancer metastasis (Fig. 1).
lncRNA
Compared with normal tissues of the same source, the expression of IncRNAs in a large number of tumor cells has changed. Recently, IncRNAs are reported to involve in tumor EMT and metastasis. Different IncRNAs regulate individual gene expression programs through epigenetic regulation or changes in transcription mechanisms. For example, in breast cancer cells, miR-495 was the target of SNHG20, and HER2 was regulated by SNHG20 via miR-495 to increase the ability of invasion and migration of tumor cells [21]. HER2 levels were also regulated by lncRNA HOTAIR by targeting at miR-331-3p in gastric cancer [22]. As necroptosis has totally different role in various tumor progression and metastasis [23], which functions as pro- or anti-tumoral role in cancer metastasis. However, there are only a few reports on the lncRNA in regulating cancer metastasis. Till now, several IncRNAs were reported to regulate necroptosis by function as competitive RNAs to increase or decrease the expression of target genes by interacting with miRNA. For instance, after treatment with hydrogen sulfide, necroptosis was induced and accompanied by decreased levels of lncRNA3037 and up-regulation of miR-15a in tracheal tissue. BCL2 and A20 were indirectly regulated by lncRNA3037, which directly bound to miR-15a and negatively regulate the level of miR-15a in the broiler trachea [24]. Moreover, lncRNA-107053293 regulated chicken tracheal cell necroptosis by function as a ceRNA of miR-148a-3p [25]. It was reported that decreased levels of miR-148a-3p suppressed the cell death of osteosarcoma [26]. Additionally, Fas-associated factor 1 (FAF1) was reported to activate the cell death machinery in the cytosol in Parkinson’s disease (PD) [27, 28].
miRNA
Mounts of miRNAs regulate necroptosis in disease development and cancer metastasis. miR-7-5p (miR-7) is reported to possess the antitumor role. MiR-7-5p was reported to inhibit tumor metastasis by targeting NOVA2 in NSCLC cancers [29], RELA in breast cancer stem cells [30] and HOXB13 in esophageal squamous cell carcinoma [31]. In rhabdomyosarcoma (RMS), miR-7 showed the anti-tumor effect to induce necroptosis by targeting mitochondrial proteins SLC25A37 and TIMM50 [32]. SLC25A37 was significantly over-expressed in high cytotoxicity patients [33] and loss of TIM50 suppressed tumor cell growth and induced apoptosis in breast cancer [34] and loss of TIM50 suppressed tumor cell growth and induced apoptosis in breast cancer [35]. Several miRNAs were reported to regulate necroptosis by targeting and regulating RIP-1. For example, the effects of miR-141-3p were explored on intestinal epithelial cells, as well as the underlying molecular mechanism. The results showed that miR-141-3p suppressed upregulation of necroptosis-related molecules and interaction of receptor-interacting protein kinase 1 (RIPK1) and RIPK3 in LPS-treated Caco-2 cells by direct interacting with RIPK1 [36]. However, the role of miR-141-3p was inconsistent on the metastasis of different cancers. miR-141-3p promoted metastasis by targeting NME1in nasopharyngeal carcinoma [37], and also regulated osteoblast activity to increase the metastasis of prostate cancer [38]. While other researchers found that miR-141-3p suppressed metastasis of papillary thyroid cancer by targeting Yin Yang 1 [39] and the decreased miR-141-3p-promoted metastasis of prostate cancer by activating NF-kB pathway [40].
miR-425-5p was reported to negatively regulate the RIP1-mediated necroptosis by direct targeting the 3′UTR of RIP1 mRNA to decrease the expression of RIP1. Thus, miR-425-5p improved inflammation response and septic liver injury by down-regulating the occurrence of necroptosis [41]. Moreover, the cellular mechanism Parkinson’s disease was related to necroptosis promotion by miR-425 deficiency, for miR-425 targeted RIPK1 transcripts and promoted the MLKL phosphorylation [42].
RIP1 and RIP3 are necessary for necroptosis, and the complex regulates death receptor-induced necroptosis [43]. Especially, knockdown of RIP1 increases RIP3-mediated necroptosis at a special circumstance [44]. Several miRNAs were reported to regulate necroptosis by interacting and regulating RIP3. For instance, high levels of miR-200a-5p triggered RIP3-dependent necroptosis in vivo and in vitro [45]. In chemoresistant tumors, co-treatment with Kras-derived exosomes and carboplatin induced RIP3/TNFa-mediated necroptosis accompanied by miR-146/miR-210 modulation in metastatic lung cancer patients [46]. In acute kidney injury (AKI) models, miR-223-3p was obviously increased during 3-MCPD-dipalmitate-induced AKI, which inhibited RIPK3 expression by targeting the 3′ un-translated region of RIPK3 [47]. Furthermore, several other miRNAs were also reported to regulate necroptosis by regulating the different targets in the necroptosis signaling pathway. According to the analysis results by TargetScan software, several miRNAs had MLKL biding sites, including miR-194-5P, miR-338-3P, miR-500a-3P, and miR-577. The expression of these miRNAs is decreased in AKI, but only has-miR-500a-3P was obviously decreased in cisplatin-treated human tubular epithelial (HK2) cells, which significantly alleviated kidney injury by regulating MLKL-mediated necroptosis[48]. In hypoxic and cancer cells, HIF-1alpha (Hypoxia-Inducible Factor-1alpha) promoted necroptosis of macrophages by upregulating miR-210 and downregulating miR-383 levels in lesional macrophages and inflammatory bone marrow-derived macrophages. Among them, miR-210 was due to targeting 2,4-dienoyl-CoA reductase and contributed to the beta-oxidation of unsaturated fatty acids. miR-383 targeted with poly(ADP-ribose)-glycohydrolase (Parg) and affected the DNA damage repair pathway in bone marrow-derived macrophages and increased cell survival [49]. Atrazine promoted necroptosis by negatively regulating miR-181-5p and upregulating inflammation and glycometabolism in carp lymphocytes [50]. Additionally, Se deficiency regulated the miR-16-5p-PI3K/AKT pathway and exacerbated LPS-induced necroptosis in chicken tracheal epithelial cells by activating necroptosis-related genes [51].
Pyroptosis in cancer metastasis
Pyroptosis signaling pathway
Pyroptosis is a newly discovered form of programmed cell death characterized by a pro-inflammatory response, and it has both the characteristics of apoptosis and necrosis in morphology [52]. Pyroptosis mainly mediates the activation of a variety of Caspases including Caspase-1 through inflammasomes, causing shearing and multimerization of a variety of Gasdermin family members including GSDMD, causing cell proliferation and cell death [53, 54]. The inflammatory reaction occurs, accompanied by the release of contents and interleukins. The release of interleukin 1-β (IL-1β) and interleukin 18 (IL-18) can further expand the inflammatory response and recruit inflammatory cells [55]. At present, there are two main pyrolysis pathways that have been discovered, namely the classic pyrolysis pathway and the non-classical pyrolysis pathway. The former is mediated by caspase1-dependent inflammasomes, and the latter is mediated by caspase 4, 5, 11, and lipopolysaccharide (LPS) [56]. In recent years, researchers have discovered that pyrolysis is closely related to a variety of human diseases, such as infectious diseases, cardiovascular and cerebrovascular diseases, immune system defects, and tumors [57, 58]. In the study of tumor pathogenesis, researchers found that pyrolysis can affect tumor cell proliferation, migration and invasion ability.
Pyroptosis is a double-edged sword for tumor progression and metastasis [58] (Table 2). Firstly, pyrolysis can inhibit the development of the tumors as an innate immune mechanism. For example, alpinumisoflavone (AIF) inhibited hepatocellular carcinoma (HCC) cell metastasis by promoting NLRP3 inflammasome-mediated pyroptosis, suggesting pyroptosis inhibited cell metastasis in AIF-treated HCC cells [59]. FL118 activated NLRP3-ASC-Caspase-1-mediated pyroptosis, which suppressed the metastasis of colorectal cancer cells [60]. Moreover, resibufogenin triggers caspase-1-dependent pyroptosis through ROS-mediated NF-kappaB suppression to inhibit metastasis of non-small cell lung cancer [61]. Secondly, pyroptosis provides a suitable microenvironment for tumor growth to exert the role of pro-inflammatory cell death. The key components of the pyrolysis pathway: inflammasome, gasdermin protein, and pro-inflammatory cytokines are all related to tumor occurrence and metastasis. For instance, in the early steps of metastasis, inflammation response recruited distant MDSCs to induce metastasis of breast cancer partly by pyroptosis-induced IL-1beta generation and downstream CCL2, CCL5, and CXCL5-related signal pathway [62]. The other paper reported that the higher expression of pyroptosis signaling pathway effectors caspase-1, IL-1beta, and GSDMD was negatively related to tumor size and lymph node metastasis [63]. The levels of pyroptosis signaling pathway effectors caspase-1, IL-1beta, and GSDMD involve in the invasion and metastasis of breast cancer. By testing 108 cases of breast cancer tissues and 23 cases of para-cancerous benign tissues, the results showed the higher expression level of caspase-1, IL-1beta, and GSDMD were associated with the lower histopathologic grade of breast cancer, the smaller of tumor size, the lower possibility of metastasis, and the better the prognosis of breast cancer [63]. Thus, it is important to clear out the regulatory mechanism of pyroptosis in the process of tumor metastasis, which has important reference significance for the therapy of cancer (Fig. 2).
lncRNAs regulate pyroptosis in cancer metastasis
In liver cancers, SNHG7 worked as a ceRNA of miR-34a, and SIRT1 was proved to be a direct target of miR-34a. Interference with SNHG7 down-regulated the expression of SIRT1, but up-regulated the levels of NLRP3, caspase-1, and interleukin-1beta, which induced pyroptosis, suggesting NLRP3-dependent pyroptosis was induced through SNHG7/miR-34a/SIRT1 signaling pathway during liver cancer [64]. Kcnq1ot1 regulated the level of caspase-1 by working as a sponge of miR-214-3p. Interference with the level of Kcnq1ot1 suppressed gasdermin D cleavage and the secretion of IL-1beta to promote pyroptosis in high glucose-treated cardiac fibroblasts [65]. Deletion of Kcnq1ot1 inhibited pyroptosis by regulating miR-214-3p and caspase-1 in diabetic cardiomyopathy [66]. Long non-coding RNA growth arrest-specific transcript 5 (lncRNA GAS5) was obviously down-regulated in ovarian cancer tissues, which was proved to be associated with inflammasome formation and pyroptosis [67]. Lnc MEG3 promoted pyroptosis and induced inflammation, which down-regulated the levels of miR-485 and up-regulated the levels of AIM2 inflammasome [68]. It has been reported MEG3 inhibited tumor metastasis by regulating the Wnt/beta-catenin pathway in oral squamous cell carcinoma [69], regulating the expression of miR-21 in gastric cancer (GC) [70], and miR-183 expression in human pancreatic cancers [71]. However, MEG3 promoted metastasis of melanoma via modulating the miR21/E-cadherin pathway [72].
LncRNA X inactive-specific transcript (XIST) promoted metastasis of glioma by miR-133a/SOX4 [73]. LncRNA XIST promoted metastasis of glioma by miR-133a/SOX4 [74]. And XIST promoted metastasis of bladder cancers via miR-139-5p-mediated Wnt/β-catenin pathway [75] and induced metastasis of melanoma by sponging miR-217 [76]. Silencing XIST promoted pyroptosis and suppressed NSCLC development by stimulating ROS production and activating the NLRP3 inflammasome. Moreover, inhibiting the expression of XIST inhibited NSCLC progression by activating miR-335/SOD2/ROS pathway mediated pyroptosis [77]. The lncRNA Neat1 induced the stabilization of mature caspase-1 leading to the higher secretion of interleukin-1β and activation of inflammasomes in macrophages, suggesting lncRNA Neat1 promoted the pyroptosis [78]. The level of XIST was decreased in several types of tumors. Silencing of lncRNA XIST suppressed the cell proliferation of NSCLC and promoted chemosensitivity to cisplatin partly by its binding to the TGF-beta effector SMAD2 and stimulating pyroptosis [79]. Intracellular LPS-induced pyroptosis of innate immune cells. Secretoglobin (SCGB)3A2, triggered pyroptosis of the RAW264.7 cells and inhibited the tumor cell growth in vitro. The results showed that LPS triggered pyroptosis of the immune cells, which clarified the direct effects of LPS on tumor cells [80].
For the endothelial cells under high-glucose stress, lncRNA MALAT1 promoted pyroptosis as the ceRNA to competitively bind miR-22, which led to the levels of NLRP3 was affected. This might be a new way in the clinical therapy for atherosclerosis (AS) [81]. The DLX6-AS1 expression increased in AKI patients, and DLX6-AS1 worked as the sponge of miR-223-3p, which led to the repressing expression of miR-223-3p in HK-2 cells. Silencing DLX6-AS1 suppressed the pyroptosis of HK-2 cells through miR-223-3p/NLRP3 signaling in LPS-induced AKI [82]. Ischemia-reperfusion (I/R) promoted lncRNA-H19 expression, which led to the significant imbalance of NLRP3/6 inflammasome, as well as the high level of cytokines and microglial pyroptosis. Actually, lncRNA-H19 functioned as the sponge of miR-21 to stimulate PDCD4 expression and formed a ceRNA in an ischemic cascade [83].
Upregulation of lncRNA NEAT1 was accompanied by the increased level of pyroptosis in the diabetic nephropathy (DN) model. Cell pyroptosis was regulated by NEAT1 and miR-34c, the target gene of NEAT1, by mediating NLRP3 in DN, caspase-1, and IL-1β [84]. Decreased expression of lncRNA MALAT1 inhibited renal tubular epithelial pyroptosis by upregulating miR-23c and down-regulating the levels of ELAVL1, NLRP3, Caspase-1, and the IL-1beta in DN [85]. LncRNA MALAT1 promoted the pyroptosis of HK-2 cells by suppressing the interaction between miR-30c and its target gene NLRP3 [86]. Atorvastatin upregulated NEXN-AS1 and the levels of NEXN, which suppressed pyroptosis by down-regulating the endogenous levels of the canonical inflammatory biomarkers NLRP3, caspase-1, GSDMD, IL-1beta, and IL-18. Thus, atorvastatin inhibited pyroptosis via NEXN-AS1/NEXN pathway in vascular endothelial cells [87].
Silencing KCNQ1OT1 obviously suppressed H2O2-induced SRA01/04 cell pyroptosis, which led to increased expression of miR-214 and down-regulated the level of caspase-1. Thus, pyroptosis is regulated by the KCNQ1OT1-miR-214-caspase-1 pathway [88]. Melatonin inhibited the pyroptosis of endothelial cells by regulating the lncRNA MEG3/miR-223/NLRP3 pathway during AS process [89]. Here, MEG3 worked as a sponge by complementarily suppressing the role of miR-223, increasing the NLRP3 level, and enhancing the pyroptosis of endothelial cells. The expression of MEG3 was promoted in lung tissues under the condition of hyperoxia. Silencing MEG3 inhibited pyroptosis to alleviate hyperoxia lung injury by suppressing NLRP3 inflammasome and caspase-1-related signaling via regulating miR-18a-thioredoxin-interacting protein (TXNIP) signaling [90].
Ferroptosis
In recent years, the influence of free radicals on the body and cytotoxicity have received more and more attention. Ferroptosis is a newly discovered iron-dependent programmed cell death (PCD) [91]. Its morphological characteristics are shrinkage of cell volume and increase of mitochondrial membrane density. The main feature of this process is the accumulation of iron-dependent lethal lipid ROS rather than cell death in the form of apoptosis [92]. Specifically, ferroptosis is due to the failure of the membrane lipid repair enzyme-glutathione peroxidase (GPX4), resulting in the accumulation of reactive oxygen radicals (ROS) on membrane lipids, and this accumulation process requires the participation of ions [93]. It regulates cell death in many diseases such as tissue I/R injury, acute renal failure, neurodegenerative disease, and cancer progression.
The main mechanism of ferroptosis is that under the action of divalent iron or ester oxygenase, it catalyzes the unsaturated fatty acids highly expressed on the cell membrane to cause liposome peroxidation, thereby inducing cell death; in addition, it is also manifested in the antioxidant system (Glutathione GSH and GPX4) expression is decreased [94]. The ferroptosis pathway was including the induction of ferroptosis by inhibiting the cystine-glutamate transport receptor (systemXC-), p53-mediated ferroptosis, and direct inhibition of GPX4-induced ferroptosis [95]. Although the signaling pathways are different, the upstream pathways ultimately affect the activity of glutathione peroxidase (GPXs) directly or indirectly, reducing the antioxidant capacity of cells and increasing the lipid peroxidation reaction. Lipid active oxygen increases, causing ferroptosis [96]. Ferroptosis inducers can be divided into two categories: the first category of inducers includes erastin, sulfasalazine, and sulfoximine, etc. This category of inducers inhibits system Xc- (glutamate and cystine The antiporter) function and reduces the content of glutathione (GSH) in the cell to induce cell redox imbalance; the second type of inducer includes RSL3, DPI7, DPI10, DPI12, DPI13, etc. Synthetic compounds, these inducers directly inhibit GPX4 and also cause the accumulation of peroxide in the cell. Ultimately, depending on the abnormal metabolism of iron ions in cells, the accumulation of reactive oxygen species (ROS) leads to ferroptosis [97].
There are many genes and enzymes involved in the regulation of ferroptosis, including P53, GPX4, ACSL4, SCL7A11, and so on. In recent years, more and more non-coding RNAs have been shown to regulate ferroptosis in tumor cells, such as miR-9 and miR-137 (Table 3). Ferroptosis plays the opposite role either inhibition or promotion in tumor metastasis by regulating multiple signaling molecules in the tumor microenvironment [98]. It might be a promising strategy to induce ferroptosis to overcome chemotherapeutic drug resistance and inhibit cancer metastasis in clinical anti-cancer therapy. Therefore, this article summarizes the regulation process of non-coding RNAs on ferroptosis during tumor development and metastasis and provides references for further elucidating the mechanism of ferroptosis in tumor metastasis (Fig. 3).
LncRNAs regulate ferroptosis in cancer metastasis
Recently, lncRNAs play an important role to regulate ferroptosis by targeting miRNAs in cancer progression. For example, treatment with XAV939 decreased the expression of lncRNA MIR503HG, which obviously suppressed NSCLC progression by sponging miR-1273c and regulating SOX4 level. The XAV939 decreased the expression of SLC7A11, which suppressed NSCLC progression through the ferroptosis pathway [99]. Overexpression of lncRNA metallothionein 1D pseudogene (MT1DP) promoted malondialdehyde (MDA) production and ROS levels and sensitized A549 and H1299 cells to erastin-induced ferroptosis by regulating the level of NRF2 via stabilizing miR-365a-3p [100]. miR-365a-3p suppressed metastasis of colorectal cancer by regulating the ADAM10–JAK–STAT pathway [101]. Lnc RNA PVT1 promoted ferroptosis in vivo by down-regulating miR-214 and upregulating the expression of TFR1 and TP53. It could be exsisted a positive feedback loop of lncRNA PVT1/miR-214/p53 [102]. Silencing lncRNA ZFAS1 attenuated ferroptosis by sponging miR-150-5p to down-regulate the expression of SLC38A1 [103].
Circ RNAs regulate ferroptosis in cancer progression
Circular RNAs works as a sponge of miRNAs to regulate cancer progression. Here, we summarized several circRNAs regulated ferroptosis and contributed to promote or inhibit cancer progression. Circular RNAs Circ_0008035, acting as a sponge of miR-599, Circ_0008035 was up-regulated in GC tissues, which contributes to tumorigenesis and represses apoptosis and ferroptosis in GC via miR-599/eukaryotic initiation factor 4A1 (EIF4A1) axis [104]. Interference with circABCB10 suppressed the cell ferroptosis by regulating the miR-326/C–C motif chemokine ligand 5 (CCL5) axis in rectal cancer [105]. CircABCB10 and CCL5 were upregulated but miR-326 was downregulated in rectal cancer. Circ-interleukin-4 receptor (circIL4R) was abnormally overexpressed in hepatocellular carcinoma (HCC). CircIL4R knockdown impeded oncogenesis and expedited ferroptosis of HCC cells by the miR-541-3p/GPX4 network [106]. Circular RNA Tau tubulin kinase 2 (circ-TTBK2) is a cancer-associated gene. circ-TTBK2 knockdown suppressed invasion, and promoted ferroptosis via targeting ITGB8 by sponging miR-761 in glioma [107].
miRNAs regulate ferroptosis in cancer progression
Triggering ferroptosis is useful to inhibit cancer progression, such as inhibition of iron–sulfur cluster biosynthetic enzyme NFS1 inhibited lung adenocarcinoma by triggering ferroptosis [108]. Sometimes, ferroptosis contributed to the antitumour effects of the tumor suppressors such as p53 and BAP1. During this process, more and more miRNAs are reported to involve in ferroptosis during cancer metastasis. For example, in acute myeloid leukemia, differentially expressed GPXs were involved in cell proliferation, cancer progression, apoptosis, and cell cycle pathways involving cancer-related miRNAs (such as miR-202 and miR-181) [109]. Physcion 8-O-beta-glucopyranoside (PG) exerted an anti-tumor role in GC by downregulating inhibitory effect of miR-103a-3p on glutaminase 2 (GLS2) expression, and the upregulating ROS level, intracellular Fe(2+) level, and malondialdehyde (MDA) generation [110]. MicroRNA-214-3p promoted ferroptosis in hepatoma cells partly by decreased the expression of ATF4, which obviously decreased the size and weight of xenografted tumors [111]. miR-137 negatively regulates ferroptosis by directly targeting SLC1A5 in melanoma cells. However, interference with miR-137 increased the antitumor effects of erastin by promoting ferroptosis, suggesting promotion of ferroptosis was a potential treatment for melanoma [112]. miRNA-17-92 is an oncogenic miRNA that has a vital role in tumor development. Overexpression of miR-17-92 suppressed the cell death of endothelial HUVEC cells and reduced ROS generation. Moreover, miR-17-92 suppressed the erastin-induced ferroptosis by regulating the A20–ACSL4 pathway [113]. High expression of miR-9 down-regulated erastin- and RSL3-induced ferroptosis through regulating glutamic-oxaloacetic transaminase GOT1 in melanoma cells [114]. While, miR-4715-3p were methylated in upper gastrointestinal adenocarcinoma (UGC). Knockdown of miR-4715-3p in UGCs inhibited GPX4 and induced cell death [115]. Additionally, several miRNAs were reported to regulate ferroptosis, but how the miRNAs regulated ferroptosis to regulate cancer metastasis was not clearly reported. For instance, lipoxygenase 15 (ALOX15) was associated to lipid-ROS production in human GC, and exosome-miR-522 worked as a potential inhibitor of ALOX15 [116]. miR-212-5p attenuated ferroptosis neuronal death by targeting Ptgs2 [117]. HUCB-MSCs-exosomes inhibited DMT1, the target gene of miR-23a-3p to suppress ferroptosis and decrease myocardial injury [118]. HUCB-MSCs-exosomes inhibited DMT1, the target gene of miR-23a-3p to suppress ferroptosis and decrease myocardial injury [119]. While in rat models, down-regulating the expression of miR-30b-5p and coadministration with ferroptosis inhibitors decreased the preeclampsia (PE) symptoms [120]. Overexpression of miR-30b-5p in PE models had a key function in ferroptosis, by decreasing the expression of Cys2/glutamate antiporter, PAX3, and ferroportin 1 (an iron exporter), leading to decreased GSH and increased labile Fe(2+), which revealed miR-30b-5p is a potential therapeutic target for PE [120]. However, the role and regulation of miR-30 family-involved ferroptosis in cancer metastasis was not still clarified, which was an interesting question till now.
The crosstalk between necroptosispyroptosis and ferroptosis
Enormous studies discovered crosstalk between these programmed cell deaths. The interaction of necroptosis, pyroptosis, and ferroptosis is mediated by several key proteins such as NEK7, Tom20, caspase 1, etc. (Fig. 4). For example, necroptosis and pyroptosis is both able to induce lytic cell death. NEK7 interacted with NLRP3 to regulate pyroptosis [121]. Knockdown of lncRNA Lfar1 inhibited NLRP3 inflammasome-mediated pyroptosis in hepatic stellate cells [122]. ZBP1 works as the sensor of fungal infection to activate pyroptosis and necroptosis [123]. Bcl-2 is found to regulate pyroptosis and necroptosis by targeting BH3-like domains in GSDMD and MLKL [124]. Caspase-8 is an important protein to work as a switch for necroptosis and pyroptosis [125]. Moreover, iron is reported to induce oxidative stress by increasing ROS levels and regulate ferroptosis and necroptosis. Tom20 is oxidized by iron-activated ROS signaling and triggers pyroptosis of melanoma cells by inducing GSDME cleavages [126]. Mixed-lineage kinase 3 (MLK3) regulated pyroptosis through NF-kB/NLRP3 signaling and ferroptosis via JNK/p53 pathway during myocardial fibrosis [127]. Transcription Factor p53 prompted pyroptosis to suppress tumor growth in NSCLC patients [128, 129]. Ferroptosis is also induced which is dependent on P53 in liver fibrosis and effectively inhibit HSC activation [130]. This demonstrates p53 is a key factor to induce both pyroptosis and ferroptosis. Undoubtedly, enormous noncoding RNAs are involved in the regulation of the crosstalk between these programmed cell deaths. However, there are few reports on the regulation of noncoding RNAs in the crosstalk between necroptosis, ferroptosis, and pyroptosis.
Conclusion and perspectives
Tumor metastasis is the main course of death from nearly all types of cancers. Recently, programmed cell death included several other types of cell death besides apoptosis and cell autophagy-induced cell death, such as necroptosis, ferroptosis, or pyroptosis, which has been reported to play different role in tumor progression. Induction of programmed cell death of tumors exerts a vital role in the clinical treatment of cancer metastasis. It is important to clearly elucidate the detailed regulatory mechanism of programmed cell death (PCD) during cancer development, in this review, we have summarized and discussed how non-coding RNAs regulate necroptosis, pyroptosis and ferroptosis, as well as their roles in cancer metastasis. However, a few important questions remain to be answered. (1) We found that there was an interaction between ferroptosis and necroptosis. As we known, iron is reported to induce oxidative stress by increasing ROS level and iron involves in various kinds of programmed cell death, such as ferroptosis and necroptosis. Iron activates ROS for GSDME-dependent pyroptosis through a Tom20–caspase–GSDME pathway in melanoma cells. Iron supplementation at a specific dosage in iron-deficient patients is effective to suppress xenograft tumor metastasis combined with clinical ROS-inducing drugs [126]. However, limited studies clarified how non-coding RNAs regulated the interactions between ferroptosis and necroptosis, ferroptosis, and pyroptosis. Thus, it is helpful to clear out the crosstalk between these different regulatory mechanisms. (2) The programmed death including ferroptosis, necroptosis and pyroptosis possessed a key role in regulation of cancer metastasis, but the role of miRNAs, lncRNAs, or circRNAs regulated programmed cell death was not clearly clarified in the metastasis of cancers. (3) It is a promising strategy in clinical cancer treatment to induce programmed cell death and identify the exact function of non-coding RNAs in the clinical therapy of cancers.
Change history
31 August 2021
A Correction to this paper has been published: https://doi.org/10.1038/s41420-021-00617-7
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Acknowledgements
This work was financially funded by the National Science Foundation of China (Nos. U1702283, 81972764, 81960488), the Joint Special Funds for the Department of Science and Technology of Yunnan Province-Kunming Medical University (Nos. 2019FE001-152, 2019FE001-074, 202001AY070001-244), the Basic Research Special Funds for the Department of Science and Technology of Yunnan Province (No. 202101AT070005), the Scientific Research Projects of Internal Research Institutions of Medicine (No. 2018NS069), The China Postdoctoral Science Foundation (Nos. 2018M643798XB, 2021M693842), the Medical Reserve Talents of Yunnan Province (Nos. D-201603, H-2019072), Provincial Key clinical specialty construction project of Yunnan Province, Training program for 100 Young and middle-aged Academic and technical backbones of Kunming Medical University.
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YL and QYC collected and analyzed relevant literature and wrote the manuscript. YNZ and TYW participated in the literature collection and collation. LJY and ZHY conceived the structure of the article and summarized the table. LH and YL helped with figures and analysis. LH created the images. ZZY designed the study, supervised and revised the manuscript. All authors read and approved the final manuscript.
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Liu, Y., Chen, Q., Zhu, Y. et al. Non-coding RNAs in necroptosis, pyroptosis and ferroptosis in cancer metastasis. Cell Death Discov. 7, 210 (2021). https://doi.org/10.1038/s41420-021-00596-9
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DOI: https://doi.org/10.1038/s41420-021-00596-9
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