Xiaohong Xiang
Jianbo Gao
Danyang Su
Doudou Shi- 1Department of Radiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- 2Department of Geriatrics, The Ninth Hospital of Xi'an, Xi'an, Shaanxi, China
Ferroptosis is a type of regulated cell death caused by iron overload and lipid peroxidation, and its core is an imbalance of redox reactions. Recent studies showed that ferroptosis played a dual role in liver diseases, that was, as a therapeutic target and a pathogenic factor. Therefore, herein, we summarized the role of ferroptosis in liver diseases, reviewed the part of available targets, such as drugs, small molecules, and nanomaterials, that acted on ferroptosis in liver diseases, and discussed the current challenges and prospects.
Introduction
Liver disease is a general term for inflammatory and non-inflammatory diseases of the liver, including hepatitis, cirrhosis, steatosis, liver cancer, and others. It is a common and extremely harmful disease that adversely affects human health. Currently, the treatment of end-stage liver disease mainly consists of liver transplantation and symptomatic treatment. Although the quality of life of patients has been greatly improved, the survival rate is still unsatisfactory. Therefore, it is necessary to find more effective treatment strategies for liver diseases.
Ferroptosis is a type of regulated cell death caused by iron overload and lipid peroxidation, which is distinct from pyroptosis, necrosis, and apoptosis. It is involved in various metabolic pathways, including iron, glutathione (GSH), and coenzyme Q metabolism (1). And studies have shown that ferroptosis is associated with the occurrence and development of liver diseases, including cancer, liver fibrosis, and ischemia-reperfusion injury (IRI) (1) (Figure 1). The nuclear factor erythroid 2-related factor 2 (Nrf2)- glutathione peroxidase 4 (GPx4) axis was involved in carbon tetrachloride (CCl4)-mediated acute liver injury in mice (2). Furthermore, the acyl-CoA synthetase long chain family member 4 (ACSL4)-mediated ferroptosis showed a tumor-promoting role in the progression of hepatocellular carcinoma (HCC) from liver injury and a tumor-suppressing role in HCC treatment (3). However, there are still few clinical applications of ferroptosis targets in liver diseases. Therefore, an in-depth understanding of the ferroptosis mechanism will promote the development of therapeutics for ferroptosis in liver diseases. The molecular mechanisms related to ferroptosis have been reviewed by other studies. Thus, herein, we review the role of ferroptosis in liver diseases and summarize the part of available therapeutic targets for ferroptosis in liver diseases.
Figure 1. The role of ferroptosis in liver diseases (Some image elements came from Figdraw with permissions).
The role of ferroptosis in liver diseases
Ferroptosis and liver injury
Acute liver injury without any underlying liver diseases includes drug-induced liver injury, IRI, and liver injury caused by acute viral infection. Liver injury caused by acetaminophen (APAP) is a common drug-induced liver injury, and IR-induced liver injury mainly includes insufficient perfusion injury of the liver caused by liver transplantation and cardiovascular diseases. A study showed that ferroptosis initiated APAP-induced liver injury, and ferroptosis inhibitors, such as ferrostatin-1 and iron chelator deferoxamine, alleviated APAP-induced liver injury (4). In addition, ferroptosis involved in IRI-induced liver injury, and HECT, UBA and WWE domain containing E3 ubiquitin protein ligase 1 (HUWE1) could antagonize abnormal iron accumulation and ferroptosis to alleviate IRI-induced liver injury (5). Further research showed that ferroptosis-related liver injury employed a variety of regulatory mechanisms, such as exosomes. Mesenchymal stem cells attenuated ferroptosis in acute liver injury by promoting the stability of SLC7A11 via exosomes (6). Moreover, exosome-delivered miR-124-3p and miR-29a-3p from heme oxygenase-1-modified bone marrow mesenchymal stem cells inhibited ferroptosis to alleviate IRI in steatotic grafts (7, 8). Although research on liver injury and ferroptosis has shown promising results, it is mainly at the level of animal models, and there is a long way to go before clinical translation. In addition, studies showed that certain necrosis inhibitors, such as necrostatin-1 (nec1) could also partially inhibit ferroptosis. Therefore, the interaction between ferroptosis and other types of cell death needs to be further explored to better guide ferroptosis treatment strategies. Moreover, inflammatory cells involved in acute liver injury, and ferroptosis have been shown to affect the function of inflammatory cells. For example, the kinase complex mTORC2 promoted longevity of virus-specific memory CD4+ T cells by inhibiting ferroptosis (9) and ferroptosis could affect the ability of macrophages to kill intracellular bacteria (10). Thus, whether and how hepatocytes and inflammatory cells ferroptosis affect each other during liver injury requires further research.
Chronic liver injury refers to long-term and chronic damage to liver function caused by multiple factors, and it is mainly seen in chronic viral hepatitis, long-term heavy drinking, and fatty liver. Hepatic stellate cells (HSCs) were rich in iron, which provided the basis for ferroptosis regulation in cirrhosis (11). The study also showed that ferroptosis was closely related to liver cirrhosis. Therefore, elastin and sorafenib treatment could alleviate liver fibrosis in mice by inducing ferroptosis. In addition, sorafenib, a well-known ferroptosis inducer, attenuated liver injury and extracellular matrix accumulation in CCl4-induced fibrotic livers by reducing SLC7A11 and GPX4 proteins (12). Ferroptosis affects multiple pathways in liver cirrhosis and is regulated in multiple ways. For instance, ferroptosis could regulate the autophagy signaling pathway in HSCs and dihydroartemisinin attenuated liver fibrosis via m6A methylation-involved ferroptosis in HSCs (13). The researchers also investigated ferroptosis in cirrhosis that develops from viral hepatitis. Chen et al. found that chronic hepatitis B virus and/or hepatitis C virus (HCV) infection altered iron metabolism and related genes in the liver (14), and ferroptosis could affect HCV replication and therapeutic efficacy (15). Moreover, hepatitis B virus X protein (HBx) could alleviate the cell death of HSCs by inhibiting ferroptosis, thereby promoting the progression of liver cirrhosis (16). In addition, steatosis and steatohepatitis have been confirmed to be related to ferroptosis, and ferroptosis inhibitors could alleviate liver injury (17), however, the underlying molecular mechanisms are not completely known. Therefore, further research is needed to reveal the role of ferroptosis in steatosis and steatohepatitis. In summary, although several potential ferroptosis targets, such as P53 and ELAVL1, have been identified, the associated studies used only cellular and animal models and the relevant molecular mechanisms are not completely clear. Therefore, further research efforts are needed.
Ferroptosis and HCC
HCC is one of the important causes of tumor-related deaths, and ferroptosis has been recognized as a tumor suppressor. Therefore, researchers investigated the induction of ferroptosis in HCC cells. Sorafenib is currently used as the first-line drug for the treatment of advanced HCC, and studies have shown that it could induce ferroptosis of HCC cells and thereby inhibit their proliferation (18). And the efficacy of sorafenib was affected by intracellular genetic status; for example, Rb-negative hepatoma cells were more sensitive to sorafenib-induced ferroptosis (19). Additionally, ferroptosis induced by sorafenib could be reversed by ferroptosis inhibitors, such as ferrostatin-1 and activation of p62-Keap1-Nrf2 axis (20, 21). Moreover, sorafenib-induced increase in metallothionein-1G (MT-1G) promoted the resistance of HCC cells to sorafenib (22). This suggests that secondary resistance to sorafenib and gene expression of HCC cells might affect the therapeutic effect of sorafenib; therefore, mechanisms underlying the resistance to sorafenib need to be further elucidated. In addition, ferroptosis-inducing nanoparticles, extracellular lactate levels, and antipsychotic drug haloperidol also participated in inducing ferroptosis of HCC cells (23–25). Taken together, seeking more effective ferroptosis therapeutic targets and strategies is beneficial for HCC.
The available targets for ferroptosis in liver diseases
The present therapeutic strategies for ferroptosis mainly include genes, RNAs, proteins, small-molecule compounds and nanomaterials. Ferroptosis related nanomaterials consisted of both iron-based and non-iron-based nanomaterials, and they induced ferroptosis by scavenging GSH and inducing the degradation of GPx4 (26). Currently, targets for ferroptosis are mainly divided into ferroptosis inducers and inhibitors. There are four types of ferroptosis-inducing compounds, including those: inhibiting the cysteine (Cys)/glutamate (Glu) reverse exchange (Xc−) system, directly or indirectly inactivating GPX4, causing iron overload and activating heme oxygenase 1 (HMOX1) (27). At present, ferroptosis was often regarded as a detrimental factor in certain liver diseases, ferroptosis-inducing agents were mainly used to treat HCC and liver fibrosis (28). Table 1 lists the part of available ferroptosis inducers in liver diseases.
Table 1. The part of available ferroptosis inducers and inhibitors in liver disease.
Ferroptosis inhibitors work by reducing iron overload and peroxidation levels and scavenging peroxidation products (81). Of these, the prominent ones are iron chelators that reduce iron overloads, such as deferoxamine and deferiprone. A small number of iron chelators are used in the clinic or clinical trials. And the library of novel deferoxamine compounds is created and updated regularly (40). Table 1 lists the part of available ferroptosis inhibitors in liver diseases. Furthermore, nec1 inhibited necrosis and ferroptosis in primary renal tubular and mouse heart transplantation models (82), but its use in liver disease is not reported. So far, the role of ferroptosis inhibitors in liver diseases has mainly been reported in animal models, and there are only a few reports about its clinical application. Therefore, additional research is needed to provide evidence for targeted ferroptosis in liver diseases. And although nanomaterials targeting ferroptosis have improved their targeting properties through special modifications such as biofilm and PUFA modification (83), their safety for in vivo application has not been effectively demonstrated.
Discussion
Ferroptosis plays an important role in the occurrence, development, and treatment of liver diseases. Researchers have screened and identified several ferroptosis inducers and inhibitors using animal experiments and small molecule compound libraries. However, evidence regarding the distribution, metabolism, excretion and use of these targets is lacking. Secondly, the role of these targets in the progression of chronic liver disease to HCC may be variable, and the underlying mechanisms are unknown. Additionally, how can targets be adjusted at different stages of liver diseases is not clear. Thirdly, the targeting of these agents needs to be improved. Studies have shown that these targets promote or inhibit ferroptosis of inflammation cells and thus affect their immune function. At present, there is little relevant evidence and the underlying mechanism needs to be elucidated. Finally, current nanomedicine technologies enable highly specific targeting of these agents, and nanomaterial-related ferroptosis promoters and inhibitors have been studied in cancers. There is a long way to go before we can effectively target ferroptosis to treat liver diseases, but we believe that combining efforts from over the world will help us realize the therapeutic strategy.
Author contributions
XX and JG designed the study. DSu, XX, and DSh revised the manuscript. All authors contributed to the article and approved the submitted version.
Acknowledgments
Thanks to the He'nan Key Laboratory of Digestive Organ Transplantation and Medicial 3D printing center of He'nan province supporting this work. In addition, we thank Bullet Edits Limited for the linguistic editing and proofreading of the manuscript.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher's note
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Keywords: ferroptosis, targets, application, advancement, liver diseases
Citation: Xiang X, Gao J, Su D and Shi D (2023) The advancements in targets for ferroptosis in liver diseases. Front. Med. 10:1084479. doi: 10.3389/fmed.2023.1084479
Received: 30 October 2022; Accepted: 27 February 2023;
Published: 14 March 2023.
Edited by:
Han Wu, Eastern Hepatobiliary Surgery Hospital, ChinaReviewed by:
Feng Zhang, Nanjing University of Chinese Medicine, ChinaCopyright © 2023 Xiang, Gao, Su and Shi. 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: Xiaohong Xiang, 1615706214@qq.com