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Exploring the dynamic interplay between exosomes and the immune tumor microenvironment: implications for breast cancer progression and therapeutic strategies

Breast Cancer Research volume 26, Article number: 57 (2024) Cite this article

Abstract

Breast cancer continues to pose a substantial worldwide health concern, demanding a thorough comprehension of the complex interaction between cancerous cells and the immune system. Recent studies have shown the significant function of exosomes in facilitating intercellular communication and their participation in the advancement of cancer. Tumor-derived exosomes have been identified as significant regulators in the context of breast cancer, playing a crucial role in modulating immune cell activity and contributing to the advancement of the illness. This study aims to investigate the many effects of tumor-derived exosomes on immune cells in the setting of breast cancer. Specifically, we will examine their role in influencing immune cell polarization, facilitating immunological evasion, and modifying the tumor microenvironment. Furthermore, we explore the nascent domain of exosomes produced from immune cells and their prospective involvement in the prevention of breast cancer. This paper focuses on new research that emphasizes the immunomodulatory characteristics of exosomes produced from immune cells. It also explores the possibility of these exosomes as therapeutic agents or biomarkers for the early identification and prevention of breast cancer. The exploration of the reciprocal connections between exosomes formed from tumors and immune cells, together with the rising significance of exosomes derived from immune cells, presents a potential avenue for the advancement of novel approaches in the field of breast cancer therapy and prevention.

Introduction

Breast cancer (BC) is the most common cancer among women in most countries, with the highest mortality and morbidity rates [1]. Despite the earlier detection and improved clinical management, there is still a high death rate among women because of treatment failure and metastasis [2]. BC can be divided based on its molecular characteristics into luminal A, luminal B, HER2, estrogen, and progesterone-positive receptors, and triple-negative BC (TNBC). Further subcategories of TNBC include basal-like 1 and 2, immunomodulatory, luminal androgen receptor, mesenchymal, and mesenchymal stem cell-like [3, 4]. TNBC and HER2-positive breast cancers are more likely to metastasize to other areas of the body, such as the brain, bone, lung, liver, and abdominal cavity [5, 6].

In recent decades, there has been a dramatic increase in the literature associated with the involvement of the immune system in BC [7]. It is well known that the immune system plays an important role in the development, progression, and control of BC [8]. The complex relationship between the immune system and cancer cells is characterized by the theory of “cancer immunoediting” (CI) [9], which was initially developed by Dunn et al. [10] CI postulates a dual role of the immune system in cancer: host-protective and tumor-promoting actions [11]. CI consists of “three Es”: elimination, equilibrium, and escape [12, 13]. In the ‘elimination’ phase, all tumor cells may be destroyed by the immune system [13]. During the second phase, the opposing forces remain balanced and cancer growth is still under control. Escape is the terminal stage of immunoediting, in which cancer cell variants effectively evade immune pressure, replicate progressively, and become clinically apparent [13]. In light of this, manipulating the immune system and boosting its defenses against cancer may be one of the keys to controlling cancer [14]. This idea is known as cancer immunotherapy [14]. Exosomes (Exo) have emerged as potential sources of biomarkers for early detection and prognosis in breast cancer. Several studies have identified specific molecules, such as proteins, nucleic acids, and microRNAs, within exosomes that show promise as diagnostic and prognostic markers. MiRNAs are small non-coding RNA molecules that regulate gene expression. For example, miRNA-21, miRNA-155, and miRNA-210 have been found to be upregulated in breast cancer-derived exosomes and are associated with tumor growth, metastasis, and poor prognosis [15,16,17]. In addition, Proteins such as human epidermal growth factor receptor 2 (HER2), and mucin 1 (MUC1) have been detected in exosomes isolated from breast cancer patients. Changes in the levels of these proteins in exosomes have been associated with tumor progression and can potentially serve as diagnostic and prognostic markers [18, 19]. The field of exosome research is rapidly evolving, and ongoing studies continue to identify new potential markers. The most common immunotherapy approaches in BC are non-specific immune stimulation, immune checkpoint blockade, adoptive cell transfer, and vaccination [20, 21]. Immune checkpoint inhibitors targeting programmed cell death 1 (PD-1), programmed cell death 1 ligand 1 (PD-L1), and cytotoxic T-lymphocyte-associated protein 4 (CTLA-4) have revolutionized cancer treatment by eliciting durable objective responses in multiple cancer types, often leading to improved overall survival [22, 23]. According to accumulating evidence, PD-1/PD-L1 inhibitors have the potential to induce durable clinical responses in some patients with metastatic TNBC and are likely to have clinically meaningful results in rare ER + HER2-BC patients as well [11]. Recent evidence has confirmed exosome-based immunotherapy as a potential new approach in the treatment of BC [24,25,26]. Exosomes are nano-sized small extracellular vesicles with endogenous origin and capacity to transport various types of proteins, lipids, RNA, microRNA (miR), and DNAs [27, 28]. Exosomes protect their cargo contents from degradation (especially RNA molecules) in systemic circulation [29]. In addition, their small size enables them to overcome the blood–brain barrier and penetrate deep into the tissues [29, 30].

Exosomes may serve as a robust and feasible vehicle for delivering immune-modulatory agents into specific target cells to either stimulate antitumor immunity or exert immunosuppressive effects [31]. In addition, Exosomes can deliver factors involved in DNA repair pathways, enhancing the repair of DNA double-strand breaks and promoting cell survival and radioresistance [32]. They can also transfer anti-apoptotic proteins that protect cancer cells from radiation-induced cell death [33]. Exosomes secreted from HER2-positive cell lines, SKBR3 and BT-474, are reportedly enriched in antigen processing/presentation-related proteins, including HSPA5 (heat shock 70 kDa protein 5), CALR (calreticulin), and PSME2 (proteasomeactivator complex subunit 2), and glycolysis/gluconeogenesis-related proteins, such as TPI1 (triosephosphate isomerase 1) and PGAM1(phosphoglycerate mutase 1) [34]. Interestingly, it has also been shown that SKBR3 and BT-474 derived-exosomes contain a full-length HER2 active molecule which can bound to trastuzumab and inhibit drug’s activity [35].

In this review, we aim to highlight the potential of using exosomes in the field of BC immunotherapy. We describe the known functions of BC-derived exosomes and immune cell-derived exosomes in immune modulation. Next, we point out how exosome-based immunotherapy can have significant therapeutic effects on BC progression. And finally, we will discuss the current knowledge on the possible applications of exosome-based immunotherapy in BC and the future direction of these fascinating vesicles in cancer therapy.

Biogenesis of exosomes and their biological importance

Extracellular vesicles (EVs) are membrane-bound vesicles that are commonly classified into three main subtypes: exosomes, microvesicles (MVs), and apoptotic bodies [36]. For the first time, Johnstone et al. used the word “exosome” to describe small membrane vesicles formed in multivesicular bodies (MVBs) in the late 1980s [37]. Exosomes are generated by various cell types and loaded with a myriad of bioactive molecules, including nucleic acids, proteins, lipids, and other metabolites, which mediate cell–cell communication via their cargo contents [38]. They have a diameter of 30–150 nm, a typical “cup dish” shape, and a density of 1.13–1.19 g/mL [39].

The complex process that leads to the biogenesis of exosomes may be divided into three main steps: first, the early and late endosomes are formed; then, intraluminal vesicles (ILVs) are formed inside the late endosomes, which leads to the formation of MVBs; and finally, upon the fusion of MVBs with the plasma membrane, ILVs are secreted throughout body fluids (blood, saliva, urine, etc.) by exocytosis and are called exosomes [40, 41]. Exosomes can be released during normal and pathological states from a majority of cell types [42].

The process of cargo sorting into the ILVs is mediated via two opposing sorting systems namely, endosomal sorting complexes required for the transport (ESCRT) dependent and ESCRT-independent pathways [41]. Four ESCRT proteins (ESCRT-0, ESCRT-I, ESCRT-II, and ESCRT-III), tumor susceptibility gene 101 (TSG101), and ALIX are mainly involved in the transition of endosomes to exosomes [43, 44]. The ESCRT-I protein Tsg101, together with the ubiquitinated proteins, triggers activation of the ESCRT-II complex and mediates the oligomerization of the ESCRT-III complex [45]. ESCRT-III machinery contributes to vesicle release into the endosome and scission [40]. Vacuolar protein sorting associate protein 4 (VPS4) and ATPase degrade the ESCRT-III complex as the final step of exosome formation [40, 46]. However, under certain conditions, the biogenesis of exosomes can occur via an ESCRT-independent pathway. This process can be mediated by lipids such as ceramides and cholesterol [47].

Exosomes participate in several normal and pathological conditions, such as pregnancy, immune responses, cardiovascular disorders, viral pathogenesis, neurological disorders, and cancer [48]. According to the origin of the donor cell, exosomes play a variety of roles, including immune response, antigen presentation, programmed cell death, angiogenesis, inflammation, coagulation, etc. [27, 49] (Figure1).

Fig. 1
figure 1

Exosome Biogenesis in the Source Cell, Uptake, and Cargo Transfer (a) Exosome Biogenesis in the Source Cell: The intracellular mechanisms involved in exosome biogenesis within the source cell are depicted in this area of the image. It displays the early endosome formation process, the sorting of different cargo molecules into the developing exosomes, and the inward budding of the endosomal membrane to generate multivesicular bodies (MVBs). Labeled cargo molecules consist of proteins, RNAs (miRNAs and mRNAs), lipids, and other bioactive compounds. (b) Exosome Uptake Routes by Target Cells: This portion of the diagram shows the various ways that target cells can absorb exosomes. It demonstrates a variety of exosome uptake processes, including as receptor-mediated interactions, membrane fusion, and endocytosis. (c) Cargo Transfer and Impacts in the Target Cell: The cargo transfer that occurs when exosomes enter the target cell and the ensuing impacts are the main topics of this portion of the picture. It shows how certain cellular processes are activated and how exosome cargo is released into the target cell’s cytoplasm

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TDEs effect on immune cells

Over the past 10 years, the study of exosomes has observed increasing attention, representing a high-potential area for their application in cancer as biomarkers and therapeutic tools [50]. Tumor-derived exosomes (TDEs) are important immune adjusters in the tumor milieu. TDEs reduce immune cell cytotoxicity in the microenvironment of tumor cells by transporting suppressive cargo to these cells, to facilitate tumorigenesis [51]. TDEs have been implicated in all stages of BC progression (tumor initiation, growth, dissemination, and metastatic spread) [2]. As part of their immunological functions, exosomes modulate antigen presentation, immune activation, immune surveillance, intercellular communication, and immune suppression [52, 53]. On the other hand, the expression of PD-1 on the surface of BC-derived exosomes can blunt T-cell activation, effectively enabling tumor cells to escape immune surveillance [54]. The functions of exosomes secreted from cancer cells are discussed in more detail in the following sections (Fig. 2).

Fig. 2
figure 2

Macrophages, T lymphocytes, natural killer (NK) cells, dendritic cells, neutrophils, and monocytes are all part of the intricate web of immune cells that surrounds tumour and impacts cancer development and outcome via their interactions with tumour cells. Important immune modifiers in the tumor environment are something called tumor-derived exosomes (TDEs) (a). TDEs enhance the development of tumors by lowering and suppressing the level of immune cells cytotoxicity and activities in the microenvironment around tumor cells. They do this by transferring suppressive cargo to these cells (b)

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NK cells

NK cells, a subset of innate effector lymphocytes, need constant renewal through bone marrow cells. It is well known that Natural killer (NK) cells are highly effective in attacking tumor cells. NK cells directly eradicate tumors using death receptors and cytolytic particles. There is evidence that Fas ligand (FasL) expressed on the surface of NK cell-derived exosomes is involved in killing Fas + tumor cells [55]. They defend against metastatic and initial tumor cells, and enhance adaptive immunity by releasing cytokines to inhibit target cell growth [56].

TDEs can integrate with the NK cell membrane, obstructing NK cells’ antitumor activity by carrying their cargo to NK cells [57, 58]. In addition, the interplay among receptors on NK cells and their TDE ligands excites multiple downstream inhibitory signaling pathways that suppress NK cells’ cytotoxic function [51]. Examples of NK cells activating receptors that TDEs downregulate include NKp46, NKG2C, NKp30, and NKG2D [59]. The exosomes-derived breast carcinoma cell line T47d, even in the presence of IL-15 stimulation, inhibits immunological functions via reducing NKG2D receptor expression [60]. The ratio of CD56dim and CD56bright NK cells in patients with breast cancer in relation to negative control was remarkably increased and decreased, respectively [61].

Stimulating NK cells by releasing (IFN-γ) and (TNF-α) promote the antitumor immune reaction. However, purified exosomes from mouse breast cancer cells debilitated the production of IFN-γ from IL-2– activated NK cells and, so impaired NK cell proliferative capacities. TDEs also significantly inhibited human NK cell proliferation in response to IL-2 through inhibiting Janus kinase 3(Jak3)-mediated signal transducers and activators of transcription 5(STAT 5) stimulation. Moreover, TDEs intensely decreased perforin release in IL-2 motivated NK cells [62]. Wen et al. demonstrated that breast cancer–derived exosomes reduced NK cells’ number and anticancer abilities [63] (Fig. 3).

Fig. 3
figure 3

TDEs can integrate with the membrane of NK cells, which may inhibit the antitumor activity of NK cells by transporting their payload to these cells. Furthermore, the interaction between receptors on NK cells and the TDE ligands that bind to them activates many downstream inhibitory signaling pathways, which in turn reduce the cytotoxic activity of NK cells

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T-CD8 + cells

A subpopulation of T cells known as T-CD8 + cells play a crucial role in the immunological tumor microenvironment of cancer patients because of their capacity for cytotoxicity. Through the use of major histocompatibility complex class I (MHC-I) molecules and the T cell receptor (TCR) found on T-CD8 + cells, they are able to identify tumor-associated antigens expressed on the surface of cancer cells. Tumor progression, invasion, and resistance to therapies are closely related to tumor microenvironment (TME) interactions. Cancer cells can evade antitumor immunity through packaging immunosuppressive mediators, such as FasL, TNF-associated apoptosis inducing ligand (TRAIL), transforming growth factor-β (TGF-β), and PD-L1 into their exosomes and affect T-CD8 + cell activity [64].

A high level of PD-L1 expression is associated with a poor prognosis in various types of tumors. PD-L1 binds to the PD-1 receptor which is expressed on almost all immune cells and inactivates their function. So, immune checkpoint inhibitors target the PD1/PD-L1 axis in cancer immunotherapy. However, anti-PD-L1 antibodies are inefficient at blocking exosomal PD-L1, so this phenomenon can promote immunotherapy resistance [65]. In head and neck squamous cell cancers (HNSCC) patients, the level of PD-L1 on exosomes, but not the level of soluble PD-L1, correlates with the progression of the disease and poor prognosis [66]. In a study, TNBC exosomes overexpressing PD-L1 reduced T-CD8 + numbers and inhibited their activities, whereas the differentiation of pro-tumorigenic cells including myeloid-derived suppressor cells (MDSCs) and M2 macrophages increased in TME [67]. T-CD8 + granzyme B secretion is also inhibited by exosomal PD-L1 in vivo, thereby protecting and promoting tumor growth [54]. Chatterjee et al. showed that high level of transforming growth factor beta (TGF-β) is correlated with secretion of PD-L1 carrying exosomes from BC cells [68]. Synergistic effects of TGF-β and TDEs expressing high PD-L1 impair T-CD8 + function by suppressing T cell receptor (TCR) signaling mediated phosphorylation (Fig. 4).

Fig. 4
figure 4

Interactions within the tumor microenvironment (TME) are directly connected to the growth of cancer, its ability to invade surrounding tissue, and resistance to treatment. Cancer cells can resist antitumor immunity by packing immunosuppressive mediators including FasL, TNF-associated apoptosis-inducing ligand (TRAIL), transforming growth factor- β (TGF- β), and PD-L1 into their exosomes. This allows the cancer cells to circumvent the immune system

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Tregs

Regulatory T cells (Tregs) assist tumor cells in evading immune system responses by secreting immunosuppressive cytokines including IL-10 and TGF-β1. The presence of Tregs within tumors is closely linked to cancer prognosis [69]. Studies have shown that exosomes obtained from tumor cells promote the production and proliferation of Tregs. CD25− CD4+ T cells can be transformed into FoxP3+ CD4+ CD25high T cells via coculture with exosomes derived from tumors. Exosomal microRNA-214, in terms of its mechanism, suppresses the expression of phosphatase and tensin homolog (PTEN) in T cells and induces regulatory T cells (Tregs) to secrete IL-10, which ultimately leads to the promotion of tumor growth [70]. Exosomes of mutant KRAS lung tumor cells promote the conversion of naïve T cells into Tregs, a phenomenon also seen following the cDNA transfection of mutant KRAS. DNA of exosomal mutant KRAS causes this transformation, as evidenced by the increased presence of FoxP3 + Tregs in cancer tissues of mutant KRAS patients compared to those with wild type (WT) KRAS [71]. Moreover, in breast cancer, exosomal long noncoding RNA (lncRNA) SNHG16 has been shown to promote the development of CD73 + γδ1 Treg cells in breast cancer by sequestering miR-16-4p, leading to the suppression of SMAD5, activation of the TGF-b1/SMAD5 pathway, and ultimately increasing CD73 expression [72].

MDSCs

Myeloid-derived suppressor cells (MDSCs) are immature myeloid-derived cells with various morphologies present in the tumor microenvironment, possessing potent immune suppressive capabilities [73]. The aggregation of MDSCs inhibits antigen processing and it’s presentation and releases several immunosuppressive substances that disrupt immune responses [74]. Several studies have indicated that the suppressive function of MDSCs on T cells can be potentiated by cancer exosomes. Exosomal HSP70 in renal carcinoma promotes cell growth and boosts the activity of MDSCs by activating TLR2 signaling [75]. Meanwile, miR-181a and miR-9 and from exosomes produced from breast cancer promote tumor development and immune escape by boosting the activity of MDSCs through activating the JAK/STAT signaling pathway. This is achieved by individually suppressing SOCS3 and PIAS3 [76]. In addition, Exosomes derived from breast cancer contain TGF-β1 and PGE2, which promote the aggregation of MDSCs and facilitate tumor progression [77].

Non-immune cells

Exosomes play a significant role in modulating the tumor microenvironment by interacting with various stromal cell types, including cancer-associated fibroblasts (CAFs), endothelial cells, and adipocytes [78]. BC-Exos can educate and activate CAFs, leading to the secretion of growth factors, cytokines, and extracellular matrix components that promote tumor growth and invasion. Moreover, exosomes can transfer oncogenic signals, such as transforming growth factor-beta (TGF-β), to CAFs, further promoting tumor progression and epithelial-mesenchymal transition (EMT) [79]. In addition, BC-Exos stimulate angiogenesis by promoting endothelial cell migration, proliferation, and tube formation. These exosomes carry pro-angiogenic factors, including vascular endothelial growth factor (VEGF), fibroblast growth factor (FGF), and matrix metalloproteinases (MMPs), which enhance the formation of new blood vessels to support tumor growth and metastasis [80, 81].

In summary, exosomes have the ability to influence the composition and functions of the tumor microenvironment. By inducing phenotypic changes in cancer-associated fibroblasts and immune cells, they promote the secretion of factors that contribute to radioresistance or immunosuppression. This altered microenvironment provides a supportive niche for surviving cancer cells and contributes to treatment resistance [82].

Exosomes-based immunotherapy approaches for BC

Surgical resection, chemotherapy, radiotherapy, hormone therapy, and radiation therapy are currently available to breast cancer patients for treatment. However, drug resistance and toxicity to healthy tissues are two issues that plague all current treatments [83]. So, developing targeted, non-toxic, and non-immunogenic delivery technologies is crucial. Exosomes and the tumor microenvironment are becoming increasingly attractive targets for clinical applications. This is mainly because of their adaptable function in carcinogenesis in terms of cancer diagnosis and response to treatment [84].

Precision BC treatment has been significantly improved by nanoparticle-based technology. Exosomes are natural nanoparticles carrying chemotherapeutic drugs, photosensitizers or antitumor drugs. For cancer therapy, exosomes are particularly appealing drug delivery system due to their excellent biosafety, low immunogenicity, carrier properties, and nanoscale penetration effect [85] (Table 1). The exosomes primary advantage over other nanoparticles is inherent capacity to transport molecules of biological significance. This feature has prompted research in treatment choices drugs including the utilization of nucleic acid or enactment of the immune system.

Table 1 Overview of Exosome based immunotherapy approaches for BC
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Dendritic-based exosomes

Dendritic cells (DCs) play key role in the immune response by capturing, processing and presenting antigens (Ag) to immature T lymphocytes and activating them. This creates a crucial link between innate and adaptive immune responses. However, tumor-associated DC with immunosuppressive activity can induce T cell tolerance and progressive tumor growth. In order to take advantage of DC’s capacity to initiate and enhance anti-tumor immunity, novel DC-targeted therapies must be developed [93].

In recent years, DC-derived exosomes (Dex) have been gaining interest as an alternative delivery method for tumor antigens. Dex carry antigen presenting particles such as MHC-I and MHC-II, CD80, CD86 and Hsp 70 and 90 [94]. T cells can be stimulated both directly and indirectly by Dex. In a direct manner, T cells are induced by MHC and co-stimulatory molecules on the Dex membrane [95]. However, this mechanism is not effective in activation of naïve T cells due to insufficiency of TCR-cross linking and co-stimulation [96]. As opposed to direct mechanisms, indirect mechanisms produce more potent T-cell responses against antigens since bystander DCs efficiently activate antigen-specific T cells in response to antigen substances transferred by Dex. Dex can induce T cell responses against the tumor by transferring MHC-peptide complexes to the tumor cell surface. One study showed that Dex treated human breast adenocarcinoma cells, SK-BR-3, increased IFN-γ secretion by CD3 + primed T cells [97] (Fig. 5a).

NK derived exosome

In cancer immunotherapy, natural killer (NK) cells are being investigated for adoptive cell therapy as intrinsic lymphocytes that facilitate tumor immune surveillance [98]. It has also been demonstrated that NK cells control the immune response in other, non-cell activation-dependent ways, one of which is through exosomes [55]. NK derived exosomes (NK-Exos) containing NK cell’s prototype markers, e.g. CD56 and cytotoxic proteins such as FasL and perforin, enables them to direct their cytolytic activity into tumor tissue sites [99]. Zhu et al. developed exosome mimetics (NK-EM) by extruding NK cells through filters with increasingly smaller pores. NK-EM showed powerful tumor-killing activity against cancers such as glioblastoma and BC in mice as compared to NK-Exo at low and high doses [100]. Kaban and colleagues, transduced lentivirally NK cell line NK92MI to express and load BCL-2 siRNA (siBCL-2) into NK-Exos. siBCL-2 NK-Exos prompted intrinsic pathway of apoptosis in BC cells via targeting BCL-2, without influencing non-dangerous cells [101] (Fig. 5b).

Fig. 5
figure 5

As an alternate delivery mechanism for tumor antigens, DC-derived exosomes, also known as Dex, have been attracting a lot of attention recently. Antigen-presenting particles like MHC-I and MHC-II, CD80 and CD86, and Hsp 70 and 90 are carried by dex in the body. This enables the DC to increase Tcell activity towards tumor tissue areas (a). NK-derived exosomes, also known as NK-Exos, are vesicles that include NK cells’ prototype markers, such as CD56, together with cytotoxic proteins like FasL and perforin. This enables the NK cells to guide their cytolytic activity towards tumor tissue areas (b)

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Exosome based vaccines

Cancer immunotherapy mainly relies on CD8 + T cells to promote Cytotoxic T-lymphocyte (CTL) activity, initiate tumor-specific CTLs in lymphoid organs, and establish lasting anti-cancer immunity [102]. Utilizing an EXO-based vaccine by activating the immune response is a promising cancer treatment option because the immune system avoids tumors. Wang et al. used HER2/neu-specific Neu-T cell derived exosome (TEXO) and HER2-TEXO vaccines by transfecting DCs to stimulate HER2/neu-specific CTLs and study anti-tumor activity. They demonstrated that novel T cell-based exosome vaccine was effective in inducing protective immunity against tumor cells and may be an alternative therapeutic method for HER2 + breast cancer, especially for women with trastuzumab-resistant HER2 + breast cancer [103]. Additionally, vaccination with exosome-loaded T cells (exosome-T) has the capacity to reverse CD4 + CD25 + Treg cell-mediated immunosuppression and initiate long-term CTL memory, making it an appealing method for generating immune responses against human cancers [104, 105]. Also, the HER2-specific exosome-T vaccine was just recently industrialized to effectively boost the immune system of the patient against HER2-positive breast cancer [106]. By utilizing the transmembrane domain of the human platelet-derived growth factor receptor to demonstration two distinct kinds of monoclonal antibodies on the external of an exosome, the brand-new synthetic poly valent antibody redirected exosome (SMART-EXO) was created. SMART-EXOs with the breast cancer-related HER2 and EGFR receptors can activate CTLs by targeting the CD3 receptor on the surface of T cells. CTLs then display highly effective and specific anti-tumor activity in vitro and in vivo [107, 108]. On the other hand, CAR-T exosomes have high safety and efficiency, which could enhance BC immunotherapy [109]. MSLN-positive TNBC cells and xenograft tumors growth were effectively inhibited by CAR-T cell exosomes secreting granzyme B and perforin without any overt side effects [110].

Macrophage-based exosomes

Macrophages are one of the innate immune cells that play a critical role in TME. Macrophages have to major subtypes: M1 and M2. M1 macrophages have pro-inflammatory function and their polarization is due to several factors including Th1 cytokines, lipopolysaccharide (LPS), and Toll-like receptor (TLR) agonists. However, Th2 cytokines including IL-4 and IL-13, polarize macrophages to M2 phenotype that exert anti-inflammatory function and has involved in tissue repair and hemostasis [111]. Tumor-associated macrophages (TAMs) are one of the M2 subtypes that polarize from macrophages in the TME and facilitate tumor growth and angiogenesis. IL-6 signaling through signal transducer and activator of transcription 3 (STAT3) transcription factor phosphorylation, induce TAMs development and tumorigenesis. Ham et al. revealed that BC-derived exosomes render IL-6Rβ (gp130) to macrophages and stimulate STAT3 signaling, thereby enhancing pro-tumorigenic microenvironment [112].

Suppressing the M2 phenotype or promoting the M1 phenotype in macrophages may be a therapeutic approach for the treatment of cancer. A number of strategies are available to inhibit M2 macrophage attraction and differentiation, including blocking the prostaglandin E2, IL-6, and STAT3 activation loops and preventing tumors from releasing growth factors [111]. Interferon-gamma (IFN-γ) administration or Notch signaling activation are two other approaches for polarizing M2 macrophages to M1 phenotype. Additionally, it has been established that miRNAs play a crucial role in controlling macrophage polarization. For instance, mir-155 inhibited M2/Th2 responses by suppressing CCAAT/enhancer-binding protein beta (C/EBPβ) and interleukin 13 receptor (IL-13R) [113]. MiR-125b by downregulating of IFN regulatory factor 4 proved the potential to activate M1 polarization [114]. Moreover, by transfecting exosomes of MDA-MB-231 cells with miR-130 and miR-33, macrophages were polarized to the M1 phenotype that inhibited tumor growth [115]. MiR-130 was transported via tumor-derived exosomes to M2 macrophages, suppressed tumor cells growth, migration, or invasion [116] (Fig. 6).

Fig. 6
figure 6

Th2 cytokines, such as IL-4, IL-13, and IL-10 polarize macrophages to the M2 phenotype, which is known to have an anti-inflammatory effect and to play a role in tissue repair and hemostasis. the M2 subtypes, which originate from macrophages in the tumor microenvironment and promote tumor development as well as angiogenesis (a). Other methods for polarizing M2 macrophages to the M1 phenotype include the infusion of cytokines and drugs. Additionally, it has been shown that microRNAs are an essential component in the regulation of the polarization of macrophages. For example, mir-155 was able to suppress M2/Th2 responses (b)

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Exosome-coated targeting substance

A new class of tumor-targeting drugs and vector models that target tumor cells within breast cells involves mesenchymal stem cell (MSC) exosomes expressing suicide or tumor-killing genes [117]. In the field of cancer treatment, mesenchymal stem cells are increasingly being sought after because of their ability to differentiate into a wide range of cell types and their powerful immunomodulatory and regenerative potentials [118]. Due to the lack of MHC-II and co-stimulatory ligands, MSCs exhibit poor immunogenicity. They also have good biosafety and are capable of homing to several organs thanks to the production of unique surface molecules [119]. Gene edited MSC-derived exosomes can overexpress a therapeutic RNA or protein to suppress tumors. The treatment of breast cancer can be achieved using MSC exosomes that express suicide or tumor-killing genes [117]. Generally modified MSC exosomes can be effective targeting delivery systems for killing HER2 + tumor cells [120]. O’Brien et al. demonstrated that EVs containing miR-379 suppressed breast tumor through regulation of cyclooxygenase-2 (COX-2) expression [121]. Vakhshiteh et al. harnessed the migration and invasion of MDA-MB-231 cells through exosome secreted by genetically modified dental pulp MSCs (DPSCs) that overexpress miR-34a [122]. Furthermore, LNA-antimir 142-3p was transported effectively by MSCs-Exo and reduced miR-142-3p and miR-150 expression in breast CSC-like cells [123].

Wang et al. targeted HER2 + ve human breast cancer cells via EVs loaded with HChrR6-encoding mRNA and expressing anti-HER2 scFv antibody batch on their surface called “EXO-DEPT”. HChrR6 is a bacterial enzyme that converts 6-chloro-9-nitro-5-oxo-5 H-benzo-(a)-phenoxazine (CNOB) into the cytotoxic drug 9-p amino-6-chloro-5 H-benzo[a]phenoxazine-5-one (MCHB). After treatment, EXO-DEPTs, but not undirected EVs, plus CNOB inhibited almost complete growth of orthotopic BT474 xenografts in vivo [124]. Similarly, Forterre et al. successfully delivered functional HChrR6 mRNA via EVs to HER2 + ve human breast cancer cells. When combined with the prodrug CB1954, they stopped the growth of HER2 + human breast cancer xenografts in athymic mice by activating the prodrug [125]. Overall, these systems are developing, and the successful implementation of them will also contribute to breast cancer treatment.

Drug delivery carriers

Exosomes can be utilized to transfer conventional clinical chemotherapy drugs to targeted sites, thus reducing their toxicity and improving their enrichment effect [126]. Tran et al. loaded aspirin, as an anti-cancer agent, into exosomes that enhanced drug dissolution and homing targeting effect. Aspirin-loaded exosomes exerts cytotoxicity effects on breast and colorectal cancers [127]. Yu et al. showed that erastin-loaded exosomes labeled with folic acid suppressed the proliferation and migration of MDA-MB-231 cells and induced ferroptosis through the depletion of intracellular glutathione and activation of ROS [88]. In another study, exosomes loaded with paclitaxel (PTX) inhibited tumor progression of MDA-MB-231 cells and were considered an effective drug delivery carrier for BC [128].

Doxorubicin (DOX), a common chemotherapeutic remedy for breast cancer, has been shown to decrease the risk of relapse by up to 8% and death by 6.5%. However, the side effects of congestive heart failure and medicine resistance necessitate switching patients taking doxorubicin to fewer effective therapies. Tian et al. engineered immature DCs (imDCs) expressing Lamp2b, an exosomal membrane protein, fused to αv integrin-specific iRGD peptide. Exosome derived from imDCs loaded with DOX and targeted to αv integrin- positive BC cells. iRGD exosomes efficiently inhibited tumor growth without noticeable toxicity [129]. Li et al. introduced milk exosomes containing DOX to the BC cells with specifically CD44-targeting hyaluronic acid (HA). The HA-mExo-Dox effectively targeted CD44-expressed BC cells and induced apoptosis in vitro [130]. Additionally, Hadla and colleagues confirmed that, in comparison to the free drug, DOX-encapsulated exosomes had less of an impact on cardiac toxicity and other tissues. As a result, the dose of DOX can be enhanced, resulting in a targeted cytotoxic effect on breast cancer cells [126].

Clinical implications

Achieving an optimal balance between maximal effectiveness and minimum side effects for conventional drugs used to combat tumors is often difficult due to tumor heterogeneity and biological barriers. Many anti-cancer agents in clinical practice have poor bioavailability and little in vivo stability, causing adverse damage to normal cells. Technologies based on exosomes offer exciting approaches to diagnosing and treating BC. Therapeutic agents can be delivered more efficiently using nanoplatforms, which are innovative dosage forms. Besides uploading drugs, nanoplatforms have the ability to target active molecules as well [131].

Nanoplatforms are mainly used to target tumors by enhancing the permeability and retention (EPR) of tumor internals or by interacting with antigens overexpressed on tumor surfaces. A unique carrier property and biosafety make exosomes ideal for developing precisely targeted approaches. In this review, current methods of exosomes in BC treatment are discussed specifically, but there are several challenges to overcome. The production and isolation methods need optimization to obtain sufficient quantities of exosomes with consistent quality and purity. Standardization of isolation, characterization, and quality control methods is crucial for safety and reproducibility. Determining the best administration route is challenging, and different routes need evaluation for effectiveness and safety. Achieving targeted delivery to specific tissues or cells is difficult, but strategies like engineering exosomes with specific ligands are being explored. Loading therapeutic cargo into exosomes is challenging due to limited capacity, and efficient methods are needed for stability and preservation. Exosomes from different cell sources may have varying immunogenicity profiles, so minimizing immune responses is important. Lastly, long-term safety and potential off-target effects or accumulation concerns require careful evaluation [132, 133].

However, through genetic editing, researchers can precisely manipulate specific genes to increase or decrease their expression, thus enhancing anti-tumor exosome production. Exosome surface modification during nanocarrier production can improve exosome recruitment and abundance at tumor locations as well as the recognition of a specific target. Additionally, chemotherapeutics and other therapeutic chemicals like phototherapy and photothermal therapy can be delivered using exosomes as a delivery vehicle. On the other hand, the majority of the current studies involve cell and animal research, and are now in the preclinical stage. It is required to do extensive research on the creation of exosome carriers, how they actually work in the human body, and the management of side effects to establish the combination of both the efficacy and safety of exosome delivery as a way to finally achieve clinical use.

Data availability

Not applicable.

References

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Acknowledgements

The authors would like to thank all the staff of the Immunology Research Center of Tabriz University of Medical Sciences for the sincere collaboration and support during the period of conducting this study.

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Authors and Affiliations

  1. Immunology Research Center, Tabriz University of Medical Sciences, Gholghasht Ave, Tabriz, Iran

    Sahar Safaei, Manouchehr Fadaee, Omid Rahbar Farzam, Amirhossein Yari, Dariush Shanehbandi, Behzad Baradaran & Tohid Kazemi

  2. Department of Biology, Tabriz Branch, Islamic Azad University, Tabriz, Iran

    Amirhossein Yari

  3. Biotechnology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran

    Elham Poursaei

  4. Research Center for Integrative Medicine in Aging, Tabriz University of Medical Sciences, Tabriz, Iran

    Cynthia Aslan

  5. Department of Immunology, Tabriz University of Medical Sciences, Tabriz, Iran

    Sahar Samemaleki

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  1. Sahar Safaei
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Contributions

T.K., B.B. and D.Sh. designed the manuscript. S.S., E.P., C.A. and S.S. wrote the main manuscript textM.F. and O.R.F. revised the manuscript.A.Y. prepared Figs. 1, 2, 3, 4, 5 and 6. All authors reviewed the manuscript.

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Correspondence to Tohid Kazemi.

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Safaei, S., Fadaee, M., Farzam, O.R. et al. Exploring the dynamic interplay between exosomes and the immune tumor microenvironment: implications for breast cancer progression and therapeutic strategies. Breast Cancer Res 26, 57 (2024). https://doi.org/10.1186/s13058-024-01810-z

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  • DOI: https://doi.org/10.1186/s13058-024-01810-z

Keywords

Breast Cancer Research

ISSN: 1465-542X

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