Abstract
Background
Immune escape, a process by which tumor cells evade immune surveillance, remains a challenge for cancer therapy. Tumor cells produce extracellular vesicles (EVs) that participate in immune escape by transferring bioactive molecules between cells.
The main body of the abstract
EVs refer to heterogeneous vesicles that participate in intercellular communication. EVs from tumor cells usually carry tumor antigens and have been considered a source of tumor antigens to induce anti-tumor immunity. However, evidence also suggests that these EVs can accelerate immune escape by carrying heat shock proteins (HSPs), programmed death-ligand 1 (PD-L1), etc. to immune cells, suppressing function and exhausting the immune cells pool. EVs are progressively being evaluated for therapeutic implementation in cancer therapies. EVs-based immunotherapies involve inhibiting EVs generation, using natural EVs, and harnessing engineering EVs. All approaches are associated with advantages and disadvantages. The EVs heterogeneity and diverse physicochemical properties are the main challenges to their clinical applications.
Short conclusion
Although EVs are criminal; they can be useful for overcoming immune escape. This review discusses the latest knowledge on EVs population and sheds light on the function of tumor-derived EVs in immune escape. It also describes EVs-based immunotherapies with a focus on engineered EVs, followed by challenges that hinder the clinical translation of EVs that are essential to be addressed in future investigations.
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Background
The term “Immune escape” or antigen escape refers to a process by which tumor cells evade immune cells' recognition and responses, therefore getting survival and developing into metastatic tumor [1]. The process of Immune escape involves the expression of ligands on tumors cells and the release of immunosuppression factors that block function and exhaust the immune cells pool [1]. The immunosuppressive microenvironment of a tumor has an imperative role in cancer development and even immunotherapy responses [2]. Since immune escape is a main factor for tumor growth, such immune checkpoint-associated proteins as programmed death-ligand 1 (PD-L1) and programmed death-1 (PD-1); and other molecules have become the topic of extreme examination [3, 4]. Cancer is a large group of diseases that influences human society and the healthcare system [5, 6]. Recent progress in tumor cell biology has revealed the key functions of extracellular vesicles (EVs) in regulating immune responses and the immune escape of cancer cells [7]. EVs are double-phospholipid vesicles released by various tumor cells participate in cell communication [8, 9]. They contain multiple ranges of biomolecules on the surface of their lumen, carrying between cells, and exchanging information [8, 9]. The term EVs is wide-ranging and can encompass numerous vesicles like exosomes, ectosomes, and other different types of vesicles that are released by various cells [10]. In this regard, the International Society for Extracellular Vesicles (ISEV) was established in 2011, which sponsored the improvement and application of different EVs. In 2014 and then in 2018, the paper ‘Minimal Information for Studies of EVs’ (MISEV) guidelines was released for the standardization of this field regarding terms, isolation methods, characterization methods, and applications in preclinical and clinical trials [11, 12]. Tumor-derived EVs function as a double-edged sword since they can promote cancer growth and metastasis by lessening cytotoxicity, causing remodeling, and conserving immunosuppressive tumor microenvironment as well as can make up anti-cancer immune responses by delivering tumor antigens and various heat shock proteins (HSPs) like HSP90 and HSP70 [13, 14]. PD-L1 has been reported on tumor derived EVs, which may act like those of cancer cells, inducing immune escape [15]. Although the immunosuppressive impact of EVs-PD-L1 is confirmed; however, EVs-PD-L1 have positive effects. For example, the inhibitory role of PD-L1 could support wound healing and tissue repair [16]. Because acute pro-inflammatory conditions after trauma may worsen tissue harm [17]. There are still several problems that need to be considered in cancer therapy, like the escapes of immune surveillance and immune cell suppression [18, 19]. In recent years, to overcome immune escape, EVs-based therapies have emerged, for example inhibiting EVs generation by tumor cells or using immune cells-derived natural EVs approaches [20, 21]. Along with the advance and success of EVs-based research, engineered EVs are appealing to growing attention, particularly in tumor cell escape, because of their loading and temporal targeting aptitude [22] (Table 1). Each of these methods is associated with advantages and disadvantages (Table 2). For clinical translation, many steps are needed because EVs are heterogeneous in size, function and physicochemical properties [10]. Besides, the process engineering requires optimal methods regarding the type of EVs and loading methods as well as the type of cargo (see reviews [23,24,25]). This review aims to weigh the potential of EVs in inducing immune escape and highlights the significance of EVs experiments for beneficial applications in immune escape. First, we define EVs biology and heterogeneity. Next, the function of tumor derived EVs that cause immune escape will be discussed. Further sections will describe possible application of EVs for immune escape, natural EVs and engineered EVs, highlighting challenges for promising clinical application.
Extracellular vesicles
Many eukaryotic cells communicate with other cells through the interchange of EVs [26]. EVs, a population of heterogeneous vesicles, contain phospholipid bilayer-membrane encircled different types of biomolecules that can be captured by recipient cells located either adjacent or distant [26]. However, it remains uncertain whether cells release EVs principally to evacuate cellular waste or unnecessary products, for intercellular communication, for cargo delivery, for spreading disease, or a combination of all [27,28,29]. Because EVs pathway shows crosstalk with other cellular signaling pathways [30]. However, EVs are broadly considered the most important factor in regulating physiological and pathological milieu. A growing body of literature has shown that EVs can affect target cells function in several ways including, internalization pathways, cargo delivery into the cytoplasm by direct fusion, and ligand-receptor interactions [31, 32]. The term EVs is general and comprise heterogeneous subpopulations of cell-derived particles with various size and morphologies [10]. The most famous subpopulations of EVs include exosomes and ectosomes [33, 34]. Exosomes can be divided into subpopulations; however, their range size is 30 to 150 nm, originating from endocytosis pathways within multivesicular bodies (MVBs) where several complexes and molecules are participating in forming intraluminal vesicles (ILVs) and loading biological cargo into ILVs. When ILVs within MVBs are released out of cell so-called exosomes, which process needs fusion of MVBs with the plasma membrane [35]. Not all ILVs culminate in to be exosomes, although ILVs are originators of exosomes. Alternatively, MVBs may fuse with lysosomes for degradation ILVs, even with autoghosomes [36]. A hybrid of exosomes and autophagosome form amphisomes, which also can release exosomes [37]. A growing body of evidence suggests that different MVB populations are present within a cell, proposing ILV subpopulations for degradation or elimination, then the regulation of this balance is not clear [8, 38, 39]. Interestingly, when degradation by lysosomes was inhibited, exosome production was increased, representing that these MVBs also have abilities to release ILVs as exosomes [40, 41]. Various ILV generation- and loading mechanisms have been suggested, which result in subpopulations of MVBs/exosomes. Besides, it was suggested that a single MVBs may contain different ILVs subpopulations [42]. It seems that exosome cargo loading is a regulated process and various mechanisms participate. Such markers as LAMP1/2, syntenin, various proteins from the ESCRT complex, CD81, CD9, and CD63 are often reported as specific markers for exosomes [43, 44]. Another EVs family is ectosomes, for example, microvesicles; which originate by blebbing of the plasma membrane, showing the composition of the plasma membrane [45]. Various ectosome subpopulations, produced via diverse biogenesis pathways, have been defined during several physiological cell stages or by many cell types [34] (Fig. 1). Ectosomes contain cell membrane markers and are very heterogeneous in size. Some typical markers such as SLC3A2, ARF6, annexin A1/2, and basigin, as well as CD9 and CD81, have been suggested to be the most specific [43]. Overall, because of the heterogeneous nature of EVs, they play a multipurpose function in physiological and pathological conditions [46,47,48]. EVs contribute to regulating different types of diseases such as cancers. EVs from Immune cells are also heterogeneous in route of biogenesis, size and cargo and are present in the blood, saliva, cerebrospinal fluid, and urine [49, 50], participating in different dimensions of tumors.
Role of EVs in immune escape
EVs carrying PD-L1
The roles of different EVs from various cancer cells in inducing immune responses have been reported. Tumour cells escape immune identification by increasing the expression levels of PD-L1 that binds to PD-1 receptors on T cells to provoke the immune checkpoint response [51]. This action induces tumor growth. The PD-1/PD-L1 interaction are far more complex. PD-1 have two ligands PD-L1 and PD-L2. PD-L1 is mainly expressed on different cells such as tumor-associated dendritic cells (DCs) [52], macrophages [52], neutrophils [53], monocyte-derived myeloid DCs [54], mast cells [55], fibroblasts [56], and other non-cancerous cells [57]. PD-L2 is expressed in DCs [58] and macrophages [59]. Both PD-L1 and PD-L2 are present in several tumor cells. Recent studies have indicated that EVs-PD-L1 can be more effective than tumor cell-associated PD-L1 in expediting escape from antitumor immunity since EVs can be prevalent in body fluids and may bind to their recipient cells more simply than tumor cells [60]. In glioblastoma cancer, interferon-γ (IFN-γ) stimulated PD-L1 expression on EVs, which inhibited T cell activation. In addition, circulating EVs of glioblastoma patients contain PD-L1 DNA that is correlated with tumor size [61]. EVs from metastatic melanomas have been shown to express PD-L1 on their surface. Several cell culture and animal models showed that exposure to IFN-γ up-regulated the amount of PD-L1 EVs, which inhibited the function of CD8 + T cells and promoted tumor growth. In metastatic melanoma patients, the amount of circulating EVs-PD-L1 is positively associated with that of IFN-γ, and differs following anti-PD-1 therapy [62], Inhibiting the cystine/glutamate transporter cystine-glutamate exchange resulted in higher PD-L1 levels in melanoma and increased EVs-PD-L1 secretion, which in turn induced M2 macrophage polarization and prevented the efficiency of anti-PD-1/PD-L1 therapy in melanoma [63]. The presence of PD-L1 in EVs of human and mouse breast cancer has been described in vitro and in vivo [64]. These EVs repressed the T-cell activation proteins for example CD3/CD28-driven ERK phosphorylation and NF-κB signaling, along with IL-2 secretion. The authors concluded that these EVs could bind to PD-1 and destroy T-cell function, thus inhibiting tumor growth in animal models [64]. The result reported by Chatterjee and co-workers found that TGF-β up-regulated PD-L1 on EVs from breast cancer cells that participated in CD8 T-cell dysfunction by weakening phosphorylation of T-cell receptor (TCR) signaling [65]. Furthermore, in the xenograft mouse model of oral squamous cell carcinoma, mitochondrial Lon-induced EVs containing PD-L1 (EVs-PD-L1) could induce the production of IFN and IL-6 from M2 macrophages, which promoted T-cell dysfunction and tumor progression [66]. Chemotherapies have been shown to induce the production of EVs-PD-L1, which contributes to immunosuppression responses in gastric cancer via the miR-940/Cbl-b/STAT5A axis [67]. In addition, radiotherapy can increase EVs-PDL-1 which promotes immune escape and increases tumor growth [68]. In prostate cancer, Poggio et al. declared that the genetic block of EVs-PD-L1 prolonged survival by endorsing anti-tumor immunity. These EVs suppressed T cell activity in the draining lymph node. They reported that the systemically administration of EVs-PD-L1 rescued the progress of tumors unable to produce their own [69]. Stem cell-derived EVs may participate in immune scape. For example, EVs from mesenchymal stem cells (MSCs) of cancerous mice carry PD-L1 that prevented CD8 + T cells proliferation and activation in experimental models, a role tumor immunosuppression [70] (Fig. 2).
The distinct roles of other tumor derived EVs in immune escape have been prepared in Table 3.
Other molecules
EVs from metastatic oral cancer loaded with HSP90 could induce tumor-associated macrophage (TAM) polarization to an M2 phenotype that promotes tumor development [81]. Head and neck squamous cell carcinoma-derived EVs carry CD73, which supports cancer progression and causes immune evasion [82]. These EVs promoted the activity of NF-κB pathway in TAMs, thus preventing immune responses by promoting cytokines production like TNF-α, IL-10, IL-6, and TGF-β1 [82]. EVs derived from melanoma cells can reach draining lymph nodes and macrophages. These EVs contain tumor antigens that lead to apoptosis in antigen-specific CD8 + T cells and tumor immune inhibition [83]. Melanoma cell-derived EVs stimulate the immunosuppressive functions of MDSCs in regulating T cells. For instance, Andreola et al. found that FasL-bearing EVs could stimulate MDSC differentiation through prostaglandin E2 and TGF-β signaling, which lessened MDSC-mediated immunosuppression [84]. They showed that these EVs up-regulated the expression of Cox2, arginase-1, and VEGF in the MDSCs. EVs from two mouse tumor cell lines (the melanoma line MO5 and the thymoma line EG7) expressing the OVA antigen. Participated in prompting tumor antigen-specific immunosuppression, probably by inhibiting DC maturation and modulating the APCs function [85]. EVs from the cerebrospinal fluid of glioblastoma patients carry LGALS9, which could inhibit DCs antigen presentation and T-cell immunity [86]. For hepatocellular carcinoma (HCC), Ye et al. reported that HMGB1 from tumor cells promotes immune avoidance of HCC by stimulating TIM-1 + regulatory B cell growth [87]. Recently, it was demonstrated that circGSE1 cargo of EVs of HCC cells increased the development of HCC by prompting Tregs development via inducing the miR-324-5p/TGFBR1/Smad3 signaling. Authors concluded that these EVs can serve as a hopeful biomarker for HCC immunotherapy [88]. TGF-β1 cargo of EVs from pancreatic ductal adenocarcinoma contain molecules that hurt NK cell function by lessening expression of CD107a, NKG2D, INF-γ, and TNF-α, also revealed to damage glucose uptake capacity by NK cells [89]. We presented other studies in Table 4.
EVs-based therapies for overcome immune escape: further directions
As mentioned above, EVs released from tumor cells participate in immune escape and immunosuppression, therefore, inhibiting EVs biogenesis, secretion, and internalization may be a possible mechanism for preventing immune evade (for further study see literature [104]) (Fig. 3). Different agents or pharmacological inhibitors may block EVs kinetics [105, 106]. For example, in our recent study, we found that Gallic acid inhibited exosomes biogenesis from two breast cancer cells. We concluded that Gallic acid may serve as an antitumor agent [107]. Reversely, in another study, we found that metformin, an ant-diabetic drug, increased exosomes secretion from glioblastoma cells, suggesting a resistance against therapy [108]. In a study, it was demonstrated that iron death inducer and GW4869 decreased the production of EVs from tumor cells and declined the immunosuppressive impact of EVs-PD-L1 that encouraged anti-cancer immune response of melanoma cells and induced CD + 8 T cells and immune memory [109]. Thus, the evidence from these studies suggests that inhibiting EVs may be a useful approach to overcome immune evade, however, some limitations may remain to be solved. For instance, many of these studies were conducted in vitro comprising cell lines and a low number of animal studies. Therefore, the side effects and systematic toxicity may be associated with these agents. In addition, these agents must only block EVs from cancer cells not from stem or healthy cells. As well, the pharmaceutics of these agents should be determined because EVs biogenesis is cross-talked with other signaling pathways. An inhibition in EVs biogenesis may be compensated with other pathways, causing cancer resistance and bystander effects.
In the exploration for innovative therapeutics, EVs therapies may stand star for overcoming immune escape. The most famous method is using DCs-derived EVs like exosomes for immunotherapy. This method was intensively reviewed in the literature [110, 111], where authors indicated that antigen-loaded exosomes can induce potent antitumor immunity. DCs-derived EVs can both directly and indirectly activate CD + 8 T cells, CD + 4 T cells, NKs, and even B cells for anticancer immunity. Furthermore, DCs-EVs based cancer immunotherapy has been studied in clinical trials [112, 113]. The idea of engaging DC-EVs as an antitumor vaccine approach is using nature’s antigen delivery system for vaccination. Nevertheless, the low clinical efficiency of these vaccines in the stimulation of adaptive immune responses remains a challenge and needs further studies because it seems that the stage of disease and chemotherapy regime are involved in immunotherapy efficacy (Fig. 3).
Engineered EVs to overcome immune escape
The harnessing of EVs in cancer therapy as a drug delivery system is now being recognized. In this context, EVs are either modified or loaded with optional cargo to overcome tumor expansion and even immune escape. Besides reinforcement, the efficacy of anticancer therapies, engineered EVs, as a novel drug delivery tool, might improve the unwanted effects and side effects of therapies including, radiotherapy and chemotherapy. EVs may genetically be modified or exogenously loaded with therapeutic drugs. However, a survey of literature shows a heterogeneity in both EVs source and engineering methods. However, each engineering technique has its benefits and difficulties and the ‘one-size-fits-all’ engineering method has not been approved yet. For example, recently researchers genetically modified macrophages to overexpress hsa_circ_0004658, which was also carried by their exosomes. When these exosomes co-cultured with HCC cells profoundly inhibited cell growth via miR-499b-5p/JAM3 signaling [33]. Recently, Chen et al. engineered an MDA-MB-231 cell line to express a high-affinity mutant human PD-1 protein (havPD-1) and suppress endogenous β-2 microglobulin and PD-L1. These EVs decreased the growth of PD-L1 overexpressed tumor cells and prompted cell death, suggesting a potential for immunotherapy [114]. In pancreatic ductal adenocarcinoma, MSCs-derived EVs were used to carry siRNA and drugs to cancer cells. MSCs-derived EVs containing oxaliplatin (OXA) and galectin-9 siRNA could prompt cell death, and inverse the suppressive tumor immune microenvironment, for instance, preventing polarization of M2 macrophage and the enrolment of T cells, therefore enhancing immunotherapy effectiveness in vitro and in vivo [115]. In an HCC study, EVs were isolated from mouse H22 cells co-cultured with PIONs@E6 and then incubated with macrophages. Findings showed that these EVs promoted immunity against HCC via inducing M1 macrophage polarization and ROS production. Furthermore, PIONs-contained EVs could suppress tumor development in HCC animal model [116]. In pancreatic cancer, Panc-1 cells were loaded with miR-125b2 and miRNA-155 and then EVs were isolated. EVs contain both miRNAs, which could alter the macrophage polarization from M2 to M1 phenotype, favorable for cancer therapy [117]. Table 5 presents the immunological-engineered EVs for cancers. These findings suggest that harnessing engineered EVs showed a hopeful outcome in inducing immune responses and overcoming the immune escape of tumor cells. For clinical translation of these results, further studies are essential.
Conclusion
Immune escape is a hallmark for tumor development and growth, and may also elucidate the failure of immunotherapy. Tumor cells recruit different mechanism to escape from immune cells, for example, they express PD-L1, which bind to PD-1 on immune cells, thus preventing the T cells function. PD-L1 and other molecules can be transferred by EVs of cancer cells through the biological fluids and cause immunosuppression. Several studies including cell culture and tumor models have shown that EVs from tumor cells containing cargoes like PD-L1 or other molecules play an important function in the immune escape of numerous cancers. These EVs can directly or indirectly suppress several immune cells such as macrophages and T cells. Due to a heterogeneity in EVs types and cargoes, it seems that immune escape elicited by EVs is not simple and different pathways may be involved. EVs-based therapies for overcoming immune escape have been suggested, for example, inhibiting EVs biogenesis and actions. In addition, EVs from immune cells such as DCs or lymphocytes may potent immune responses against tumor cells. Natural EVs may not do effectively on immune responses and even suppress immune cells. EVs could serve as a drug delivery platform for cancer therapy. EVs can be modified or loaded with therapeutic molecules on their cargo or/and on the surface to interact with tumor and immune cells, causing profound antitumor immunity. Several molecules are conjugated into different EVs, which induce T cells and macrophage responses and inhibit tumor growth in preclinical experiments. All EVs-based therapies have several advantages and disadvantages regarding either technical or outcomes. EVs-based clinical application is hindered by the heterogeneity of EVs and the lack of optimized engineering methods.
Availability of data and materials
None.
Abbreviations
- EVs:
-
Extracellular vesicles
- HSPs:
-
Heat shock proteins
- PD-L1:
-
Programmed death-ligand 1
- PD-1:
-
Programmed death-1
- ISEV:
-
International Society for Extracellular Vesicles
- MISEV:
-
Minimal Information for Studies of Extracellular vesicles
- T-EVs:
-
Tumor-derived extracellular vesicles
- MVB:
-
Multivesicular bodies
- ILVs:
-
Intraluminal vesicles
- DCs:
-
Dendritic cells
- IFN-γ:
-
Interferon-γ
- TCR:
-
T-cell receptor
- MSCs:
-
Mesenchymal stem cells
- MHC- 1:
-
Major histocompatibility complex 1
- HMGB1:
-
High mobility group box 1
- HCC:
-
Hepatocellular carcinoma
- TAM:
-
Tumor-associated macrophage
- MDSCs:
-
Myeloid-derived suppressor cells
- TGF-β:
-
Transforming Growth Factor β
- OVA:
-
Ovalbumin
- VEGF:
-
Vascular Endothelial Growth Factor
- APCs:
-
Antigen-presenting cells
- LGALS9:
-
Galectin9
- ICD:
-
Immunogenic cell death
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Ahmadi, M., Abbasi, R. & Rezaie, J. Tumor immune escape: extracellular vesicles roles and therapeutics application. Cell Commun Signal 22, 9 (2024). https://doi.org/10.1186/s12964-023-01370-3
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DOI: https://doi.org/10.1186/s12964-023-01370-3