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Ferroptosis, Necroptosis, and Pyroptosis in Anticancer Immunity

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Ferroptosis, Necroptosis, and Pyroptosis in Anticancer Immunity Tang et al. Journal of Hematology & Oncology (2020) 13:110 https://doi.org/10.1186/s13045-020-00946-7 REVIEW Open Access Ferroptosis, necroptosis, and pyroptosis in anticancer immunity Rong Tang1,2,3,4†, Jin Xu1,2,3,4†, Bo Zhang1,2,3,4†, Jiang Liu1,2,3,4, Chen Liang1,2,3,4, Jie Hua1,2,3,4, Qingcai Meng1,2,3,4, Xianjun Yu1,2,3,4* and Si Shi1,2,3,4* Abstract In recent years, cancer immunotherapy based on immune checkpoint inhibitors (ICIs) has achieved considerable success in the clinic. However, ICIs are significantly limited by the fact that only one third of patients with most types of cancer respond to these agents. The induction of cell death mechanisms other than apoptosis has gradually emerged as a new cancer treatment strategy because most tumors harbor innate resistance to apoptosis. However, to date, the possibility of combining these two modalities has not been discussed systematically. Recently, a few studies revealed crosstalk between distinct cell death mechanisms and antitumor immunity. The induction of pyroptosis, ferroptosis, and necroptosis combined with ICIs showed synergistically enhanced antitumor activity, even in ICI-resistant tumors. Immunotherapy-activated CD8+ T cells are traditionally believed to induce tumor cell death via the following two main pathways: (i) perforin-granzyme and (ii) Fas-FasL. However, recent studies identified a new mechanism by which CD8+ T cells suppress tumor growth by inducing ferroptosis and pyroptosis, which provoked a review of the relationship between tumor cell death mechanisms and immune system activation. Hence, in this review, we summarize knowledge of the reciprocal interaction between antitumor immunity and distinct cell death mechanisms, particularly necroptosis, ferroptosis, and pyroptosis, which are the three potentially novel mechanisms of immunogenic cell death. Because most evidence is derived from studies using animal and cell models, we also reviewed related bioinformatics data available for human tissues in public databases, which partially confirmed the presence of interactions between tumor cell death and the activation of antitumor immunity. Keywords: Necroptosis, Ferroptosis, Pyroptosis, Anticancer immunity Introduction some treatment modalities, such as chemotherapy and The mechanism by which the host immune system rec- radiotherapy, endow cancer cells with the ability to pro- ognizes and kills tumor cells has not been well estab- mote potent anticancer immunity [2, 3]. However, these lished. Whether dead tumor cells have immunogenic findings were not widely acknowledged due to the lack potential to elicit effective antitumor responses remains of direct molecular evidence of tumor-associated antigen controversial because only nonself antigens are able to (TAA) involvement in antitumor immunity. In the 1990s induce an immune response according to the “self/non- and 2000s, several studies gradually elaborated TAA- self” model that emerged in the 19th century [1]. Be- directed antitumor immunity, ranging from how TAA- tween the 1960s and 1980s, many studies reported that specific T cells survive negative selection in the thymus to how these T cells in the tumor microenvironment kill * Correspondence: [email protected]; [email protected] † cancer cells [4, 5]. Rong Tang, Jin Xu and Bo Zhang contributed equally to this work. “ ” 1Department of Pancreatic Surgery, Fudan University Shanghai Cancer The danger model of immunity, which emerged in Center, No. 270 Dong’An Road, Shanghai, China the 1990s, partially attributes the activation of the anti- Full list of author information is available at the end of the article tumor immune response to nonphysiological cell death © The Author(s). 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data. Tang et al. Journal of Hematology & Oncology (2020) 13:110 Page 2 of 18 and the subsequent release of specific molecules, which is significant for the development of complicated neuronal are referred to as damage-associated molecular patterns circuits, modulating membrane fluidity, and cell adapta- (DAMPs). These DAMPs bind receptors in various im- tion to environments with different temperatures [16]. mune cells and trigger a series of immune responses, in- The accumulation of PUFAs in membranes creates a vul- cluding the activation of innate and adaptive immune nerability to lethal lipid peroxidation due to their ability to cells [6], opsonization or phagocytosis of dying cancer form stabilized radicals, and many reactive electrophiles cells [7], and maturation of dendritic cells (DCs) [8]. targeting nucleophilic sites in vital proteins are generated Over a long period, the cell death mechanisms have in this process. Hence, one possible physiological function been inaccurately classified in a dichotomized manner as of ferroptosis is the elimination of cells with the excessive follows: (i) apoptosis regulated by intrinsic pathways and production of electrophilic intermediates [17]. Another extrinsic intervention and (ii) accidental necrosis. How- thought-provoking question relates to the identification of ever, apoptosis is usually regarded as an immune- the factors that switch the cell death pattern from apop- tolerogenic process. In 2014, two studies reported a po- tosis to nonapoptotic cell death. Existing evidence sug- tential mechanism by which apoptotic cells maintain im- gests that necroptosis is a backup cell death mechanism mune silence [9, 10]; the authors postulated that triggered when apoptosis is hindered, which is highlighted apoptotic caspases play a key role in the immune- by caspase-8 inhibition of lethal necroptotic signaling [18]. tolerogenic process despite the lack of a clear molecular Acyl-CoA synthetase long-chain family member 4 mechanism. Five years later, Jiang et al. elucidated that (ACSL4) is a key factor that controls the sensitivity of cells caspase 3/6/7 activation causes the downregulation of to ferroptosis induction by regulating pro-ferroptotic lipid. cGAS, MAVS, and IRF3, which are essential proteins for Researchers unveiled ACSL4 as a target of caspase cleav- the activation of innate immunity [11]. Similarly, age during bortezomib-induced apoptosis [19]. Therefore, necrosis-induced inflammation facilitates only tissue re- it is biologically plausible that the inactivation of ACSL4 pair responses (which are largely immunoregulatory) but during apoptosis may inhibit the insertion of PUFAs into not effective anticancer immunity [1]. In this context, re- the membrane, thereby limiting the capability of cells to searchers introduced a novel concept, i.e., immunogenic undergo ferroptosis. In contrast, cells that undergo ferrop- cell death (ICD), which might be elicited by tumor vac- tosis because of cysteine deprivation have approximately cination, radiotherapy, and some types of chemotherapy 10% the normal level of intracellular GSH [20]. The redu- [12]. For a long time, ICD was also referred to as im- cing power of GSH may be required for the processing munogenic apoptosis (IA) because most types of ICD and activation of caspases 3 and 8 [21, 22]; hence, cells de- occur via apoptosis. In recent years, with the increasing pleted of GSH could be unable to activate caspases. The awareness of cell death mechanisms, many nonapoptotic main signal pathways of these nonapoptotic cell deaths cell deaths have been defined. Necroptosis, pyroptosis, are shown as Fig. 1. Many studies found that these cell and ferroptosis are three widely studied nonapoptotic cell death modalities were widely involved in cancer clearance. deaths, all of which harbor unique molecular characteris- For example, genetically enhanced tumor-selective ferrop- tics. Functionally, their role under physiological conditions tosis sensitivity obviously inhibited the formation and de- in mammals has not been well-defined. According to pre- velopment of pancreatic cancer in genetically engineered vious studies, mammalian necroptosis and pyroptosis pri- mice [23]. This phenomenon was replicated through the marily exist to counteract pathogen infections and trigger administration of cyst(e)inase, which is a drug that de- an inflammatory anti-microbial response through the re- pletes cysteine and cystine, suggesting a translatable lease of DAMPs. Interestingly, several lines of evidence means to inducing ferroptosis in pancreatic cancer [23]. suggest that crosstalk exists between necroptosis and pyr- Similarly, inducing necroptosis could dramatically increase optosis [13–15]. Activated necroptosis by the induction of the survival times
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