IL-17: Balancing Protective Immunity and Pathogenesis

Sun, Lu; Wang, Lufei; Moore, Bethany B.; Zhang, Shaoping; Xiao, Peng; Decker, Ann M.; Wang, Hom-Lay

doi:https://doi.org/10.1155/2023/3360310

Journal of Immunology Research

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Abstract Introduction Conflicts of Interest Authors’ Contributions Acknowledgments References Copyright Related Articles

Review Article | Open Access

Volume 2023 | Article ID 3360310 | https://doi.org/10.1155/2023/3360310

IL-17: Balancing Protective Immunity and Pathogenesis

Lu Sun,¹Lufei Wang,²Bethany B. Moore,³Shaoping Zhang,⁴Peng Xiao,^5,6Ann M. Decker,¹and Hom-Lay Wang¹

Academic Editor: Baohui Xu

Received22 Mar 2023

Revised07 Jul 2023

Accepted17 Jul 2023

Published12 Aug 2023

Abstract

The biological role of interleukin 17 (IL-17) has been explored during recent decades and identified as a pivotal player in coordinating innate and adaptive immune responses. Notably, IL-17 functions as a double-edged sword with both destructive and protective immunological roles. While substantial progress has implicated unrestrained IL-17 in a variety of infectious diseases or autoimmune conditions, IL-17 plays an important role in protecting the host against pathogens and maintaining physiological homeostasis. In this review, we describe canonical IL-17 signaling mechanisms promoting neutrophils recruitment, antimicrobial peptide production, and maintaining the epithelium barrier integrity, as well as some noncanonical mechanisms involving IL-17 that elicit protective immunity.

1. Introduction

During the last few decades, understanding the pathophysiology of inflammatory diseases has been expanded by the discovery of the existence of different T cell subsets. Effector T helper (Th) cells are derived from naive CD4⁺ T cells triggered by the engagement of T cell receptor (TCR) and costimulatory molecules under the presence of specific cytokines. The main subsets of activated CD4⁺ T cells include specialized Th1/Th2 cells and Treg cells with distinct functional profiles [1, 2]. This aforementioned paradigm was challenged by the discovery of other T cell subsets including T helper 17 (Th17) cells, Th9, Th22, and T follicular helper (Tfh) cells [3–6]. Retinoic acid receptor-related orphan receptor-γt (RORγt) and signal transducer and activator of transcription 3 (STAT3) are the key transcription factors in activating the differentiation of the program of committed Th17 cells. Transforming growth factor-β (TGF-β) and proinflammatory cytokines such as interleukin 6 (IL-6) are critical cytokines for murine Th17 cell differentiation [7]. The signature cytokine, IL-17, of Th17 cells has pleiotropic roles targeting both nonhematopoietic cells, including fibroblasts and epithelial cells, and hematopoietic cells. IL-17 has emerged as having dichotomous roles due to both destructive and protective effects in various diseases, especially infectious diseases and autoimmune diseases. This review summarizes the basic pathogenic roles of IL-17 and particularly focuses on the protective role of IL-17 responses.

2. IL-17 Cytokine and Signaling

IL-17, the hallmark cytokine of Th17, was cloned and named as CTLA8 in 1993 [8]. The IL-17 cytokine family consists of six members based on sequence homology, called IL17-A, IL17-B, IL-17C, IL-17D, IL-17E (also known as IL-25), and IL-17F [9, 10]. IL-17A and IL-17F can form either heterodimers or homodimers, as they have closely related expression patterns and sequences [11]. IL-17A (also commonly called IL-17) has been the most studied member of the IL-17 cytokine family. Besides Th17 cells, various innate and acquired immune cells are also capable of producing IL-17 (Figure 1). The main non-Th17 cellular sources that can produce IL-17 cytokines include type 3 innate lymphoid cells (ILC3), γδ T cells, CD8⁺ T cells, and natural killer cells [12–16]. It has also been reported that neutrophils can produce IL-17 after stimulation with LPS or recombinant IL-6 and IL-23 [17, 18]. There are five different subunits of IL-17 receptors, IL-17RA, IL-17RB, IL-17 RC, IL-17 RD, and IL-17 RE [14]. IL-17 receptors are expressed widely in different cells and tissue types. IL-17 signals via a heterodimeric IL-17RA/IL-17RC complex [19, 20].

Figure 1

Schematic representation of the IL-17 signaling pathway: transduction and amplification. The IL-17RA and IL-17RC subunits bind to IL-17A, IL-17F, and IL-17AF ligands. The intracellular domains interact with adaptor Act1. Act1 additionally contains a TRAF-binding site that enables association with TRAF family proteins. Engagement with TRAF6 drives activation of the classical NF-κB, MAPK pathway. Act1 can also engage other TRAF family proteins to promote a post-transcriptional mRNA stabilization pathway. Th17, T helper-17 cells; γδ T cells, gamma delta T cells; ILC, innate lymphoid cells; NKT nature killer T cells; TRAF, TNF-receptor associated factor; MAPK, mitogen-activated protein kinase; NF-κB, nuclear factor κB; AP-1, activator protein; C/EBP, CCAAT enhancer-binding protein.

A conserved cytoplasmic motif known as the “similar expression of fibroblast growth factor and IL-17R” (SEFIR) domain was identified within the members of the IL17R family, which is closely related to Toll/interleukin-1 receptor (TIR) domains expressed in Toll-like receptor (TLR) and IL-1R family members [10, 21]. Adaptor for IL-17 receptor (Act1) (nuclear factor-kappa B (NF-κB) activator 1), also known as CIKS encoded by the gene TRAF3IP2 (TRAF3 interacting protein 2), also contains the SEFIR domain and is an indispensable component in the IL-17 signaling pathway [22, 23]. IL-17R/Act1 signaling activation is mediated through SEFIR domain–SEFIR domain interaction that recruits tumor necrosis factor-R-associated factor 6 (TRAF6), a critical upstream activator for transcription factor NF-κB, AP-1 (activator protein-1), and C/EBP (CCAAT/enhancer-binding protein) [10, 24–26], all of which induce a panel of inflammatory mediators to respond to pathogens (Figure 1). While IL-17-mediated responses involved in infection and inflammatory diseases, it is important to note that signaling through IL-17/IL-17R also plays a protective role through multiple mechanisms, such as regulating the recruitment and granulopoiesis of neutrophils, producing antimicrobial peptides and maintaining barrier integrity [27, 28]. The regulation of pathologic versus protective IL-17 responses involves a complex interplay of several factors. Transcriptional factors, including RORγt, STAT3, IRF4, and FoxP3, play critical roles in the differentiation, function, and balance of Th17 cells and Tregs, thereby influencing the outcome of IL-17-mediated immune responses. Specifically, RORγt is considered the master transcription factor for IL-17 production and promotes the differentiation of naïve CD4⁺ T cells into Th17 cells, which produce IL-17. Activated STAT3 plays a crucial role in promoting IL-17 production by enhancing its transctiption and IRF4 interacts with RORγt and collaborates in the regulation of IL-17 expression by binding to the IL-17 gene promoter. On the contrary, FoxP3 is a transcription factor that plays a crucial role in the development and function of regulatory T cells (Tregs). Dysregulation of these factors can contribute to the development of inflammatory diseases by either excessive IL-17 production or impaired regulatory mechanisms. Furthermore, the cytokine milieu and the local microenvironment, such as a balance between immune cell types, at the site of infection or inflammation also influence the balance between pathologic and protective IL-17 responses. Understanding these regulatory mechanisms is crucial for the development of targeted therapies that can modulate IL-17 responses in a beneficial way, promoting host defense while minimizing tissue damage and chronic inflammation in various infectious and inflammatory diseases.

3. Immunopathogenesis of IL-17

Even though IL-17 is produced in response to most infections, there is convincing evidence suggesting improperly regulated IL-17 and other Th17 cytokines can contribute to the pathogenesis of a variety of diseases [29]. Excessive IL-17 can be detrimental for many human inflammatory and autoimmune diseases including psoriasis, arthritis, Sjogren’s disease, and inflammatory bowel disease (IBD) [30–35] (Table 1). In rheumatoid arthritis (RA), for example, IL-17 induced proinflammatory pathogenesis partially by activating osteoclastogenesis that is closely associated with bone resorption in RA patients [36] (Table 1). Periodontitis is a common chronic inflammatory disease caused by microbial infection in the susceptible hosts and it has been documented that IL-17 plays both protective and destructive roles in the progression of periodontitis [37, 38]. Some studies have found that IL-17 dominated the inflammatory network associated with periodontitis traits [39, 40] (Table 1), which indicated that abnormal inflammatory responses induced by IL-17 may cause tissue damage. One potential mechanism is that IL-17 is able to amplify inflammation through excessive neutrophil recruitment by enhancing proinflammatory cytokine/chemokine production, which results in further osteoclast activation and bone resorption [41]. However, emerging evidence demonstrates the role of anti-inflammatory cytokines in regulating IL-17. For instance, IL-10 plays a key role in limiting IL-17-mediated pathology [39]. Furthermore, fibroblasts are one of the most abundant cell types that contribute to the formation of connective tissue. IL-17 not only mediates fibroblast proliferation [42] (Table 1), but also induces fibroblast cells to secrete the matrix metalloproteinase-1 (MMP-1) and MMP-3 causing connective tissue destruction [43]. It is also documented that the presence of bacterial dysbiosis and increased microbial load may be accompanied by hyperproduction of IL-17 in chronic and leukocyte adhesion deficiency I (LAD-I) periodontitis [44]. Notably, IL-17 signaling was critical for acute lung injury of influenza infection and S. pneumoniae coinfection with influenza virus elicits IL-17A response causing inflammation in the nasopharynx [45, 46] (Table 1). Targeting IL-17RA signaling or IL-17A could potentially be a therapeutic strategy to mitigate immunopathology associated with sever influenza infections.

IL-6 is both a signaling mediator that prominently contributes to maintenance of the Th17-cell population and a known pro-inflammatory target in downstream IL-17 signaling. Importantly, the IL-17-mediated positive feedback loop of IL-6 signaling through NF-κB and STAT3 contributes to enhanced autoimmune encephalomyelitis (EAE), whereas neutralizing IL-17 disrupts IL-17-sustaining, IL-6 self-reinforcing loop at the sites of inflammation [47] (Table 1). Regarding digestive disease, there is increased IL-17 expression and number of IL-17-producing T cells in the inflamed mucosa of active IBD patients [32, 48]. Furthermore, genome-wide association studies (GWAS) have identified several Th17/IL-17-associated genetic variants in Crohn’s disease and ulcerative colitis patients [49]. There is a clear need to understand how those genetic variants integrate with cells, microbes, and even metabolites in the intestinal microenvironment. Additionally, a recent study demonstrates that the Th17/RORγt⁺ regulatory T cell balance driven by IBD microbiota is reversible by a defined microbiota transplant in a set of gnotobiotic mouse experiments [50]. The interplay between Th17 cells and Treg cells in the context of intestinal microbiota engages in an extensive bidirectional communication. IL-10 produced by Tregs promotes immune homeostasis whereas expansion of Th17 cells may alter the configuration of the gut microbiome. Furthermore, intestinal microenvironmental factors, such as diet and antibiotic use, may lead to microbiome disturbance. However, the microbiome plays decisive roles in the training and shaping of the host immune system. The crosstalk between perturbations of the gut microbiome and immune dysregulation may finally lead to an inflammatory disorder of the gastrointestinal tract [51]. The studies to identify these alternations and understand them in complex networks may have either diagnostic or therapeutic potential. Indeed, insights into IL-17 studies have spurred efforts to explore and test targeted therapies via different clinical trials with IL-17 inhibitors. Psoriasis is a T cell-mediated inflammatory systemic disease that is characterized by proliferating keratinocytes and erythematous plaques on the skin. The clinical studies of Bimekizumab and Secukinumab have shown the remarkable efficacy of IL-17 inhibition for the treatment of plaque psoriasis [52, 53]. Moreover, IL-17 antagonist netakimab is effective and safe in the treatment of cytokine release syndrome in COVID-19 [54]. Collectively, emerging evidence indicates IL-17 is a key mediator in inflammatory pathogenesis but the mechanisms are complex and await further elucidation.

4. IL-17 Canonical Protective Effects

4.1. IL-17 Increases the Generation and Recruitment of Neutrophils

While the presence of IL-17 has been implicated in inflammatory pathogenesis, it exerts protective functions in clearing pathogens and maintaining tissue homeostasis through diverse mechanisms that have also been documented. The most well-known function of IL-17 is its ability to initiate an inflammatory response inducing neutrophil-specific chemokines [(CXCL1, CXCL2, CXCL5, and IL-8) that attract neutrophils from the bloodstream to sites of infection, the expression of adhesion molecules to facilitate the firm attachment and extravasation [10], and granulocyte colony-stimulating factors (G-CSF) that promotes neutrophil generation and migration to the site of infection at surfaces of the skin and mucosa [55]. IL-17 was also reported to induce the expression of granulocyte-macrophage colony-stimulating factor (GM-CSF) in NK cells [56]. Additionally, induced G-CSF and GM-CSF from IL-17 will in turn enhance the expansion and survival of neutrophils [57]. Furthermore, IL-17 plays a role in neutrophil recruitment in limiting pathogens [58–60] (Figure 2). Disruption of IL-17 signaling resulted in bacterial dysbiosis accompanied by earlier autoimmune disease onset in the gut and worsened severity associated with increased G-CSF expression in the intestine and systemic GM-CSF expression in one study [61]. These data might be interpreted as showing neutrophils serve critical protective roles in host defense processes. It has also been reported that IL-17RA-deletion abrogated the increase of splenic neutrophil progenitors [62] and IL-17 signaling played a nonredundant role in neutrophil recruitment in human lung tissue through elaborated G-CSF [63]. Moreover, IL-17RA-deficient mice exhibited increased susceptibility to additional pathogens due to a lack of neutrophil recruitment [64–67].

Figure 2

Role of IL-17 in protective immunity versus immunopathology. Protective immunity: IL-17 activates the production of chemokines for neutrophil recruitment and triggers neutrophil extracellular traps (NETs) for pathogen clearance. IL-17 promotes the production of antimicrobial peptides (AMPs) with antibacterial properties through skin or mucosal surfaces. IL-17 also enhances epithelial barrier function to prevent dissemination of pathogens to amplify immune response. Immunopathology: IL-17 mediates tissue inflammation and damage that leads to different inflammatory and autoimmune diseases.

In addition, IL-17 can synergistically raise IL-1β-mediated cellular mRNA induction and protein release of IL-8 via activation of AP-1 and NF-κB [68]. IL-1β can also functionally synergize to enhance CCL20 production in human gingival fibroblasts to recruit Th17 cells [69]. Thus, IL-17 can cooperate with IL-1β to promote a Th17 laden environment, which in turn may cause a protective situation. Apart from upregulating chemokine expression in epithelial and endothelial cells, the formation of the IL-17 signalosome driven by IL-17-induced dimerization of IL-17RA potentiates CXCL1 mRNA expression in keratinocytes [70] and CXCL1 recruits neutrophils. Furthermore, IL-17 also induces MAPK activation and prolongs the half-life of CXCL1 mRNA [71] and regulates the stability of CXCL1 mRNA transcripts [72]. Zhang et al. [73] further demonstrated that IL-17 potentiates its immunosuppressive effects through tumor-associated neutrophil recruitment and pathogen clearance by neutrophil extracellular traps (NETs). NETosis is increased in severe COVID-19 patients [74] and a potential mechanism that has been suggested is that the cytokine storm might be perpetuated by IL17-induced systemic NETs. Altogether, these studies point out that IL-17 is a key component for neutrophil homeostasis, which is fine-tuned by a balance among granulopoiesis, extravasation of neutrophils into local infected sites, as well as prolonged longevity of neutrophil-specific chemokines.

4.2. IL-17 Promotes the Production of Antimicrobial Peptides

The protective mechanisms of IL-17-mediated immunity are not only limited to neutrophil orchestration but also related to antimicrobial peptide (AMP) production, such as S100 proteins, cathelicidin (LL-37 in humans and mCRAMP in mice), β-defensins, C-type lectins, and lactoferrins to clear pathogens (Figure 2). AMPs are well recognized as important proteins in innate immunity, especially on the skin and mucosal surface. Strikingly, the host defense peptide cathelicidin is a potentiator for Th17 differentiation and mice lacking cathelicidin cannot increase IL-17 production in response to inflammation [75]. β-Defensins are key components of innate immunity, which directly kill or inhibit the growth of some Gram-positive as well as Gram-negative microorganisms. IL-17 enhances antimicrobial peptides produced by human keratinocytes or epithelial cells [76, 77] and IL-17 acts synergistically with IL-22 produced by ILC3s to induce AMP secretion by epithelial cells, such as β-defensin 2, β-defensin 3, and lipocalins, which play indispensable roles in limiting dissemination of pathogens [78, 79]. Given the synergistic effect of IL-17 and IL-22, it is not surprising that the IL-17/IL-22 alliance functions as an essential component of mucosal immunity to pathogens. TNF-α can have an additional synergistic effect with IL-17 to increase the production of AMPs, such as β-defensin 2 and S100A7 by keratinocytes [80, 81]. In the past decade, murine studies have provided clues to elucidate the complexity of the intestinal microbiota and the host defense against microbiota to maintain mucosal barrier function and homeostasis through complicated molecular mechanisms. Ivanov et al. [82] reported that the presence of segmented filamentous bacteria (SFB), a single commensal microbe, is sufficient to induce IL-17-producing cells in the small intestine and colonization of SFB reduces the growth of the intestinal pathogen Citrobacter rodentium and correlated with antimicrobial peptide secretion. However, the induction of the Th17 population not only depends on the intestinal microbiota, but also depends on constant exposure of the intestine to diet and metabolism as highlighted by multiple studies with distinct metabolic mechanisms impacting different Th17 cell phenotypes [83]. The mechanisms that regulate heterogenous nonpathogenic Th17 cells (npTh17) and pathogenic Th17 cells (pTh17) were further dissected by single-cell ATAC-seq integrated with single-cell RNA-seq showing differences in the chromatin landscape of each [84]. Moreover, IL-17-induced antimicrobial protein regenerating family member 3Alpha (REG3A) in keratinocytes can promote skin proliferation after injury [85]. Taken together, the mounting evidence suggests that another hallmark protective function of IL-17 is stimulating AMP production. However, further studies are needed to fully unravel the regulatory mechanisms surrounding the role of IL-17 in AMP production.

4.3. IL-17 Maintaining Barrier Integrity

The fundamental role of the epithelium of the gastrointestinal tract and skin, which combined are the largest human body surface area exposed to the external environment, is developing barrier integrity to resist diverse hostile pathogens. Several diseases have been associated with compromised epithelial barrier function, such as IBD, psoriasis, and atopic dermatitis [86, 87]. A plethora of past studies have implicated IL-17-producing cells or IL-17’s role in maintaining homeostasis of barrier integrity and preventing pathogens from invasion [12] (Figure 2). Neutralization of IL-17 aggravates the development of dextran sulfate sodium- (DSS-) induced colitis in mice due to downregulated claudin expression resulting from IL-17 neutralization, resulting in decreased or even compromised mucosal barrier integrity [88]. γδ T cells have differential TCR expression and distinct functions such as producing either IFNγ or IL-17 [89], which could alter barrier integrity. Interestingly, IL-17 also regulates the tight junction protein occludin during epithelial injury, and the protective effects of IL-17 produced by γδ T cells, independent of IL-23 signaling, remains intact in a DSS-induced colitis model [90]. Moreover, inhibition of IL-17 signaling exacerbates colitis that was associated with severe intestinal epithelial barrier dysfunction [91]. These studies are a strong endorsement of the protective effects of IL-17 in forming and maintaining the intestinal mucosa fence. Loss of epithelial barrier function could result in the dissemination of pathogens or commensal bacteria allowing easy access to macrophages and dendritic cells residing below the mucosal barrier, which in turn amplifies the subsequent innate and adaptive immune activation and causes disease development.

Epithelial integrity can also be enhanced by inducing tight junction correlated proteins, such as upregulating claudin gene expression, through the IL-17-mediated ERK MAPK pathway [92]. Kallikrein 1 expression can also be driven by IL-17 in renal epithelial cells to confer protection against Candida albicans dissemination and expression of kallikrein is impaired in IL-17RA^−/− mice following C. albicans infection [93]. Taken together, the commensal organisms or pathogens from the lumen can be kept from passing through tight junction proteins between epithelial cells by IL-17-mediated barrier tightening. It is true that IL-17 also plays a pathogenic role during protective surveillance, thus leading to the paradox of IL-17; tissue-damaging potential is weighed against its protective role in maintaining barrier integrity [90, 94]. Further work will be required to unravel more about the regulation of IL-17 in epithelial barrier function as well as the regulation of IL-17 production from either Th17 cells or other cell types.

5. IL-17 Noncanonical Protective Effects

IL-17 has blossomed during the past 30 years and has gained much attention for context-dependent roles in switching between friend and foe. This review largely highlights the beneficial aspects and it is evident that IL-17/IL-17R signaling results in neutrophils recruitment, AMP secretion, and tight junction maintenance.

In addition to the mechanisms mentioned above, IL-17 signaling can also affect T and B cell functions. Act1 is necessary for IL-17-mediated inflammatory responses and functions as a negative regulator in T and B cells via direct inhibition of STAT3 [95]. Majumder et al. [96] recently found a novel role of IL-17 in driving the activation of fibroblastic reticular cells in secondary lymphoid organs through metabolic reprograming, which potentiates the proliferation and survival of these cells as well as promotes B cell responses. Additionally, IL-17 is also known to govern hypoxic adaptation of injured epithelium. [97]. Moreover, proper control of IL-17 might decrease short-term memory deficit and delay mild cognitive impairment in Alzheimer’s disease [98, 99]. More research efforts are needed to explore how IL-17 controls central nervous system autoimmunity as well as regulates neuron communication before clinical trials for therapy can be designed.

Finally, the compelling future direction of IL-17 research will investigate proper brakes to control the level and capacity of IL-17 signaling. Future studies may unveil fine-tuned mechanisms for regulating inflammation and maintaining successful immunity with minimal immunopathology. Furthermore, gaining an in-depth understanding of these mechanisms may facilitate discovering and providing new therapeutic drugs. There is no doubt that more context- and tissue-dependent functions of IL-17 in human diseases and homeostasis will be revealed in the following decade.

Conflicts of Interest

The authors declare that they have no conflicts of interest.

Authors’ Contributions

LS and LW contributed to the study design, data acquisition, and drafted the manuscript. BM and SZ provided intellectual input and PX drew the diagram and table. LS, LW, BM, SZ, AD, and HW revised the manuscript. All authors approved the submitted version. LS and LW contributed equally to this work.

Acknowledgments

This study is supported by University of Michigan School of Dentistry, Department of Periodontics and Oral Medicine. Open access funding enabled and organized by BTAA 2023.

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