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Int J Biol Sci 2022; 18(11):4400-4413. doi:10.7150/ijbs.72707 This issue Cite

Review

An Update on the Multifaceted Role of NF-kappaB in Endometriosis

Yuanmeng Liu¹, Jianzhang Wang¹, Xinmei Zhang^1,2,

1. Department of Gynecology, Women's Hospital, School of Medicine, Zhejiang University, Xueshi Road, Hangzhou 310006, China
2. Zhejiang Provincial Key Laboratory of Precision Diagnosis and Therapy for Major Gynecological Diseases, Women's Hospital, Zhejiang University School of Medicine, Hangzhou 310006, China

✉ Corresponding author: Department of Gynecology, Women's Hospital, School of Medicine, Zhejiang University, Xueshi Road, Hangzhou 310006, China. Zhejiang Provincial Key Laboratory of Precision Diagnosis and Therapy for Major Gynecological Diseases, Women's Hospital, Zhejiang University School of Medicine, Hangzhou 310006, China. Tel: 86-571-87061501-2131; E-mail: zhangxinmedu.cn More

Abstract

Endometriosis remains a common but challenging gynecological disease among reproductive-aged women with an unclear pathogenesis and limited therapeutic options. Numerous pieces of evidence suggest that NF-κB signaling, a major regulator of inflammatory responses, is overactive in endometriotic lesions and contributes to the onset, progression, and recurrence of endometriosis. Several factors, such as estrogen, progesterone, oxidative stress, and noncoding RNAs, can regulate NF-κB signaling in endometriosis. In the present review, we discuss the mechanisms by which these factors regulate NF-κB during endometriosis progression and provide an update on the role of NF-κB in affecting endometriotic cells, peritoneal macrophages (PMs) as well as endometriosis-related symptoms, such as pain and infertility. Furthermore, the preclinical drugs for blocking NF-κB signaling in endometriosis are summarized, including plant-derived medicines, NF-κB inhibitors, other known drugs, and the potential anti-NF-κB drugs predicted through the Drug-Gene Interaction Database. The present review discusses most of the studies concerning the multifaceted role of NF-κB signaling in endometriosis and provides a summary of NF-κB-targeted treatment in detail.

Keywords: NF-κB, endometriosis, peritoneal macrophage

Introduction

Endometriosis is a benign gynecological disease that affects 6%-10% of reproductive-aged women and 20%-50% of women with infertility [1, 2]. It is defined as the abnormal implantation of the endometrium outside the uterine cavity, particularly in the ovaries and pelvic peritoneum [3, 4]. The colonization and growth of ectopic endometrium can result in chronic pelvic pain, infertility, dysmenorrhea, and other clinical symptoms in endometriosis patients [3, 4]. Increased inflammatory responses in ectopic endometrial tissues are believed to be strongly associated with the pathogenesis of endometriosis, which is induced by the activation of proinflammatory factors and signaling pathways, as well as the increased infiltration of immune cells [5-7].

The activation of nuclear factor kappa B (NF-κB) in patients with endometriosis has been found to play a vital role in regulating disease progression through complex mechanisms [8]. As a superfamily of transcription factors, NF-κB has five members, including RelA (p65), RelB, c-Rel, NF-κB1 (p105/p50), and NF-κB2 (p100/p52) [9] (Figure 1A). All five members share a Rel homology domain (RHD), which is essential for homo or heterodimerization and binding to cognate DNA elements [9]. The resting state of NF-κB dimers is sequestered in the cytoplasm by a family of inhibitors of κB (IκB) proteins (such as IκBα, IκBβ, p105, and p100), which serve as inhibitors through their ankyrin repeats [10]. When NF-κB signaling is activated, IκB is phosphorylated by IκB kinases (IKKs) and degraded by the proteasome, which allows NF-κB dimers to enter the nucleus and elicit the transcriptional activity of downstream genes [8].

 Figure 1 

A simplified view of the structure and transduction process of NF-κB. (A) Structures of the members of the NF-κB signaling pathway. ① The NF-κB superfamily contains five members: RelA (p65), RelB, c-Rel, NF-κB1 (p105/p50), and NF-κB2 (p100/p52). p50 and p52 are shorter forms processed by p105 and p100, respectively. All members share a Rel homology domain (RHD), which contains two specific DNA-binding domains (DBDs) and a nuclear localization sequence. One of the DBDs is engaged in DNA recognition, and the other is involved in dimerization. ② The IκB family contains the three most important members: IKBα, IKBβ, and IKBγ. ③ The IKK complex contains the three most important members. GRR: glycine-rich region; ANK: ankyrin repeats; DD: death domain; TAD: transcription activation domain; LZ: leucine zipper domain; KD: kinase domain; HLH: helix-loop-helix domain; NBD: NEMO-binding domain; MOD/UBD: minimal oligomerization domain/ubiquitin-binding domain; ZF: zinc finger domain. (B) NF-κB signaling is activated in endometriotic cells. Stimuli, such as TNF-α and IL1, activate the IKK complex, triggering IKB phosphorylation and its subsequent proteasomal degradation. The RelA/p50 heterodimers then translocate to the nucleus and elicit transcriptional activity. Estrogen, progesterone, oxidative stress, and ncRNAs are the key regulators of NF-κB signaling, and the effects of estrogen on NF-κB signaling are controversial. Activation of the downstream genes of NF-κB signaling induces inflammatory responses and supports the survival, adhesion, migration, and invasion of endometriotic cells during endometriosis development.

In endometriotic cells, NK-κB signaling is activated by stimuli, such as tumor necrosis factor α (TNF-α) and interleukin-1β (IL-1β) [11-19]. The IKK complex, which contains two catalytic subunits (IKK-1 [IKK-α] and IKK-2 [IKK-β]) and a noncatalytic accessory protein NF-κB essential modulator (NEMO [IKKγ]), is activated under stimulation (Figure 1B) [20]. The IKK complex then phosphorylates IκB proteins, allowing the cytoplasmic RelA/p50 heterodimer to be released and translocated to the nucleus [20]. The transcriptional activity of several proinflammatory cytokines/chemokines, such as IL1, IL6, IL8, TNF-α, RANTES, MIF, and ICAM1, is activated by NF-κB signaling, indicating the key role of NF-κB in the inflammatory responses in endometriosis [11, 13, 14, 18, 19, 21-27].

NK-κB signaling has a close relationship with key regulatory factors for the onset and progression of endometriosis, including estrogen, progesterone, oxidative stress, and noncoding RNAs (ncRNAs). In addition, NK-κB signaling can regulate the cellular behaviors of endometriotic cells and peritoneal macrophages (PMs) in the endometriotic milieu, as well as contribute to endometriosis-induced pain and infertility. In this review, we discuss the role of NF-κB in endometriosis pathogenesis and the relevant molecular mechanisms. We also summarize and predict known and potential anti-NF-κB drugs for endometriosis treatment.

Regulation of NF-κB signaling in endometriosis

Estrogen

The effects of estrogen signaling on NF-κB in endometriosis are controversial (Figure 2). An early study first discovered that estrogen and/or its receptors, estrogen receptor (ER) α and ERβ, can increase NF-κB activity in ectopic endometrial cells, contrary to their effect in normal endometrial stromal cells [28]. Repressor of estrogen receptor activity (REA), a key ER corepressor in the female reproductive tract, is downregulated in ectopic endometriotic lesions, contributing to the activation of estrogen signaling and enhanced NF-κB activity [29]. Mechanistically, estrogen signaling induces NF-κB activation in endometriotic cells by activating several proinflammatory pathways, such as CXCL12/CXCR4, PI3K/Akt, and thymic stromal lymphopoietin (TSLP) signaling [25, 30, 31].

Estrogen-stimulated NF-κB activation can promote the viability and proliferation of endometriotic cells. Mechanistically, NF-κB signaling can restrict autophagy-related cell death, inhibit the expression of PTEN and activate the PI3K/Akt and MAPK/ERK pathways [30, 31]. In addition, estrogen-induced NF-κB activity can also affect the polarization of PMs in the endometriotic milieu (see the “Macrophage polarization” section) [32].

The treatment of endometriotic cells with GnRHa, a hormone therapy that induces the hypoestrogenic state of ectopic endometrium, reduces NF-κB activation in endometriotic cells and further suppresses the expression of the proinflammatory cytokine IL8 [22]. This finding indicates that hormone therapies may have the potential to inhibit NF-κB signaling and reduce inflammation in ectopic endometrial lesions [22].

However, some studies have reported the inhibitory effect of estrogen signaling on NF-κB in endometriosis [33-35]. Mechanistically, estrogen can reduce the expression of AGTR1, a gene that encodes the angiotensin II receptor, which is overexpressed and activates NF-κB signaling in endometriosis [34]. By applying a microarray-based technique, Han et al. found that TNFα/NF-κB signaling is downregulated by ERβ in the eutopic endometrium of a C57BL/6 mouse model [33]. In addition, NF-κB signaling can also be repressed by estrogen signaling in PMs [35]. Treating PMs with ERB-041, a selective ERβ agonist, inhibits NF-κB activation and its downstream inducible nitric oxide synthase (iNOS)/nitric oxide (NO) signaling during endometriosis progression [35].

SR-16234 is a selective estrogen receptor modulator that has potent antagonistic activity on ERα with weak partial agonist activity against the ERβ receptor [36]. In a BALB/c mouse model of endometriosis, treatment with SR-16234 substantially decreased NF-κB p65 expression and reduced the growth of endometriotic lesions [36]. In an open-label single-arm clinical trial, the oral administration of SR-16234 substantially relieved the pain symptoms of patients with endometriosis [37]. These findings indicate that selectively inhibiting estrogen/ERα signaling while activating estrogen/ERβ signaling may serve as a potential therapeutic strategy for endometriosis treatment.

 Figure 2 

NF-κB and estrogen in endometriosis. In endometriotic cells, estrogen can activate NF-κB signaling by activating CXCL12/CXCR4, PI3K/Akt, and TSLP signaling, and low REA expression also contributes to the activation of the estrogen/NF-κB axis. Estrogen-stimulated NF-κB activity further activates Akt and ERK signaling, represses PTEN expression, and induces production of the proinflammatory cytokines CCL2 and IL8. In addition, estrogen can inhibit NF-κB signaling in endometriotic cells by repressing AGTR1 expression. In peritoneal macrophages, estrogen/ERβ signaling can inhibit NF-κB activation and further inhibit NOS production.

Progesterone

The p65 subunit of NF-κB and progesterone receptor (PR) can repress each other through direct contact. The mutual repression of p65 and PR in the endometrium is involved in endometrial biologic alterations during the menstrual cycle and pathophysiologic processes, such as irregular uterine bleeding [38-40]. In a study of 109 patients with endometriosis, increased p65 expression and decreased PRB (a PR isoform) expression jointly served as biomarkers for the recurrence of ovarian endometrioma [41]. However, another study with 104 patients drew the opposite conclusion that the recurrence of ovarian endometriosis is associated with decreased p65 expression and increased PRB expression [42]. The contradictory conclusions of the two reports may have been partially caused by clinical, immunological, histochemical, inflammatory, and genetic-epigenetic heterogeneity of endometriotic tissues [43-45]. In addition, other factors, such as the low reproducibility of immunohistochemistry analysis, and the different patterns between recurrent and initial endometriosis, may have also affected the results [42]. These findings indicate that the relationship between p65/PR expression and endometriosis recurrence needs to be re-evaluated.

As a commonly used hormone drug for treating endometriosis, progesterone inhibits the NF-κB-induced production of proinflammatory factors in endometriotic cells [46, 47], and the combined use of progesterone and NF-κB inhibitors can remarkably increase the efficacy of alleviating endometriosis-related pain [48]. However, a recent study revealed that progesterone resistance, a central element during endometriosis progression, may weaken the inhibitory effect of progesterone on NF-κB by inducing aberrant endoplasmic reticulum stress in endometriotic tissues [49]. The upregulation of endoplasmic reticulum stress in endometriotic cells by its activator can remarkably inhibit NF-κB-induced inflammation by upregulating the NF-κB-negative regulators A20 and C/EBPβ, indicating the potential anti-NF-κB value of endoplasmic reticulum stress in endometriosis [49].

Oxidative stress

The relationship between NF-κB and oxidative stress in endometriosis is shown in Figure 3. The imbalance between pro-oxidants (free radical species, such as reactive oxygen species [ROS] and nitric oxide synthase [NOS] and antioxidants is implicated in the pathophysiology of endometriosis [50]. The overproduction of ROS in the pelvic cavity of patients with endometriosis is an important inducer of chronic NF-κB-mediated inflammatory responses [51-53]. Extracellular high mobility group box-1 (HMGB-1), a prototypical molecule of damage-associated molecular patterns, activates NF-κB in endometriotic cells by binding to its receptor, Toll-like receptor 4 (TLR4), and induces inflammatory responses in the environment of endometriosis with sustained oxidative stress [52, 53]. In addition, the HMGB-1/TLR4/NF-κB axis can also induce the proliferation and invasion of endometriotic cells and contribute to endometriosis-induced pain [52-54].

 Figure 3 

NF-κB and oxidative stress in endometriosis. Oxidative stress induces NF-κB activation in endometriotic cells through iron overload and by activating the HMGB-1/TLR4 and estrogen/ERα pathways. HNF1β, as a coactivator for NF-κB, can activate NF-κB to protect endometriotic cells against oxidative damage. NF-κB activation in endometriotic cells may also induce the production of pro-oxidants (iNOS and NO) and reduce antioxidant enzymes (SOD, GPx, HO, and CAT). In peritoneal macrophages, estrogen/ERβ signaling can inhibit the NF-κB/NOS/NO axis and may alleviate oxidative stress.

During retrograde menstruation, erythrocytes are carried into the pelvic cavity of patients with endometriosis, and the lysis of erythrocytes results in iron release, with free iron serving as a source of ROS [55]. Iron overload activates IKKβ and stimulates NF-κB signaling, conferring pro-endometriotic behaviors on endometrial stromal cells [27]. Hepatocyte nuclear factor-1 beta (HNF1β) is a homeobox transcription factor that is overexpressed in endometriotic cells [56]. It functions as a coactivator for NF-κB, and its activation can enhance the survivability of endometriotic cells in oxidative cellular environments [56].

NF-κB signaling may also contribute to oxidative stress overload in patients with endometriosis by promoting NOS production and decreasing the expression of antioxidant enzymes, such as superoxide dismutase (SOD), glutathione peroxidase (GPx), heme oxygenase (HO), and catalase (CAT) [35, 57, 58]. Notably, two estrogen receptors (ERα and ERβ) are engaged in the regulation of the NF-κB/NOS/NO axis; ERα activates this axis in endometrial stromal cells, and ERβ inhibits this axis in PMs [35, 57]. These findings indicate that estrogen signaling may have different effects on NF-κB-mediated oxidative stress in the ectopic endometrium and endometriotic milieu.

Noncoding RNAs

NcRNAs are a heterogeneous class of RNAs that do not encode proteins but participate in the pathophysiological processes of endometriosis by regulating gene expression [59]. MiRNAs are ncRNAs that are 19-25 nucleotides in length and negatively regulate gene expression by binding to the 3′-untranslated regions of target mRNAs [59]. Four types of miRNAs, namely, miR-16, miR-138, miR-182, and miR-199a, directly target the key NF-κB signaling-related genes IKKβ (targeted by miR-138 and miR-182) and p65 (targeted by miR-16 and miR-199a) to inhibit NF-κB signaling, and their expression is downregulated in ectopic endometrium [60-63]. In contrast, two miRNAs, namely, miR-9 and miR-22, indirectly activate NF-κB signaling by repressing the expression of sirtuin 1 (SIRT1), an NAD (+)-dependent deacetylase, to reduce inflammatory responses in the ectopic endometrium [64, 65]. The overexpression of miR-16, miR-138, miR-182, and miR-199a or the inhibition of miR-9 and miR-22 can block NF-κB signaling and further repress inflammatory responses and the survival, migration, and invasion abilities of endometriotic cells [60-65].

Long noncoding RNAs (lncRNAs) are another group of ncRNAs more than 200 nucleotides in length [59]. MALAT1, a lncRNA, is overexpressed in the ectopic endometrium and enhances the proliferation and invasion of endometriotic cells by activating the NF-κB/iNOS/MMP9 axis [58]. However, the mechanism by which MALAT1 activates NF-κB remains unclear.

Role of NF-κB in endometriosis pathogenesis

NF-κB regulates endometriotic cell behaviors

NF-κB signaling affects endometriosis progression by regulating the activities of endometriotic cells. The abnormal survivability of endometriotic cells is correlated with NF-κB-mediated activities, such as secretion of the proinflammatory cytokine IL8 and activation of the antiapoptotic molecules XIAP, Bcl-2, and Bcl-xL [18, 56, 66, 67]. In a Macaca fascicularis model of endometriosis, p65 knockdown by short hairpin RNA considerably reduced the expression of proliferating cell nuclear antigen (PCNA) and the microvessel density of ectopic lesions, indicating that NF-κB can be a therapeutic target for preventing the growth and angiogenesis of endometriotic lesions [68].

The aberrant adhesion of endometriotic cells is an initial step for the establishment of endometriosis [69]. Decoy receptor 3 (DcR3), a pleiotropic immunomodulator, can move retrograde to the ectopic endometrium with menstrual blood and subsequently induce upregulation of adhesion molecules in an NF-κB-dependent manner [70]. NF-κB signaling induces the high expression of key adhesion molecules in the ectopic endometrium, including homing cell adhesion molecule (CD44), ICAM-1, and vascular cell adhesion molecule-1 (VCAM-1). Inhibition of NF-κB can effectively reduce the adhesive ability of endometriotic cells [19, 70, 71].

The high migration and invasion ability of endometriotic cells is considered the main cause of implantation and extension of the ectopic foci [72]. Studies have revealed that NF-κB signaling contributes to endometriotic cell migration and invasion through the transcriptional activation of matrix metalloproteinases (MMPs, especially MMP-2 and MMP-9), a family of zinc-dependent endopeptidases that are responsible for extracellular matrix degradation [71, 73-75]. Nasiri et al. exhibited potent inhibitory effects of the anti-NF-κB drugs aloe-emodin and aspirin on the invasion of endometriotic cells from patients with stage IV endometriosis [71]. In another study, IKKβ knockdown via short interfering RNA remarkably suppressed the migration and invasion of endometriotic cells, further indicating the critical role of NF-κB signaling in ectopic endometrial implantation [60].

NF-κB and macrophages in the endometriotic milieu

Activated PMs are involved in the pathological process of peritoneal endometriotic lesions [76]. In a study of 44 cases (22 with and 22 without endometriosis), a significantly higher proportion of NF-κB nuclear translocation was found in PMs from patients with endometriosis [77]. NF-κB activation contributes to the crosstalk between PMs and endometriotic cells and affects the polarization/differentiation of PMs in the ectopic milieu (Figure 4).

Crosstalk between PMs and endometriotic cells

Endometriotic cells can activate NF-κB signaling in PMs by secreting CCL17, and this process is dependent on JNK signaling [78]. NF-κB activation in PMs subsequently induces the secretion of IL6, which in turn activates the JNK/CCL17 axis in endometriotic cells, forming crosstalk between PMs and endometriotic cells [78].

PMs can also activate NF-κB signaling in endometriotic cells through different mechanisms. IL1β, a potent macrophage cytokine produced from activated PMs in the ectopic milieu, activates NF-κB in endometriotic cells, resulting in the production of proinflammatory cytokines/chemokines, such as RANTES and MIF [13, 14, 21]. In addition, PMs can release exosomes that deliver miR-22-3p, a miRNA that activates NF-κB signaling in endometriotic cells by suppressing SIRT1 expression [65].

 Figure 4 

NF-κB and macrophages in endometriosis. (A) NF-κB signaling contributes to the crosstalk between peritoneal macrophages (PMs) and endometriotic cells. The IL6/JNK/CCL17/CCR4 axis induces NF-κB activation in PMs, which then promotes IL6 production and forms a positive loop. In addition, IL1β and exosome-derived miR-22-3p secreted by PMs induce NF-κB activation in endometriotic cells, which may promote secretion of the proinflammatory cytokines RANTES and MIF. (B) NF-κB signaling affects PM polarization in the endometriotic milieu. Tregs and estrogen/ERβ signaling induce M2 macrophage polarization and endometriotic cell proliferation by repressing NF-κB in monocytes and activating NF-κB in endometriotic cells. Telocytes promote M1 macrophage polarization while inhibiting endometriotic cell proliferation and mitochondria-mediated PM apoptosis by activating NF-κB in PMs.

Macrophage polarization

Traditionally, macrophages differentiate into classical proinflammatory M1 macrophages or alternative anti-inflammatory M2 macrophages in response to different environmental stimuli. In the endometriotic milieu, M1 macrophages secrete multiple cytokines/chemokines for inflammatory responses, inhibiting endometriotic cell proliferation and promoting tissue damage, whereas M2 macrophages possess an immunosuppressive ability that supports the survival and invasiveness of endometriotic cells, stimulates the growth and vascularization of ectopic endometrial lesions, and induces pain generation [78-82]. During the progression of endometriosis, NF-κB suppression in monocytes/macrophages enhances M2 macrophage polarization and inhibits M1 macrophage polarization, developing a pro-repair environment for neovascularization in ectopic lesions [80, 81]. One mechanism is the binding of soluble fibrinogen-like protein 2 secreted by the increased regulatory T cells (Tregs) in the endometriotic milieu to its receptor CD32B expressed on PMs [81]. Tregs activated by PMs further suppress NF-κB signaling and induce an immune tolerance environment for endometriosis progression [81]. Telocytes, a type of mesenchymal/stromal cell, were recently identified to enhance M1 macrophage polarization in the endometriotic milieu by activating NF-κB signaling, which helps suppress the onset of endometriosis [80]. In addition, NF-κB activated by telocytes can also promote macrophage proliferation by inhibiting mitochondrion-dependent apoptosis [80].

In endometriotic cells, NF-κB signaling is activated by estrogen/ERβ signaling and can enhance M2 macrophage polarization [32]. Mechanistically, estrogen-stimulated NF-κB signaling promotes CCL2 production, which recruits PMs and induces macrophage M2 polarization, thus promoting the pathogenesis of endometriosis [32].

NF-κB contributes to endometriosis-associated pain and infertility

NF-κB and pain

The presence of TRPA1/TRPV1-expressing nerve fibers in ectopic endometrium is one of the key factors for pain generation [83]. In a C57BL/6 mouse model of endometriosis, Fattori et al. observed that endometriosis-induced NF-κB activation contributes to increased calcium influx in TRPA1/TRPV1-expressing dorsal root ganglion (DRG) neurons [84]. This pattern of neuronal activation coincides with peripheral sensitization detected in the activation of NF-κB [85, 86].

In an SD rat model of endometriosis, NF-κB overexpression was found in the DRG and spinal dorsal horn (SDH), which was induced by the HMGB-1/TLR4/MyD88 pathway and contributed to mechanical hyperalgesia at the graft site of ectopic endometrium [54]. Inhibiting the expression of TLR4 or MyD88 could decrease NF-κB p65 phosphorylation in the DRG, alleviating chronic endometriosis-induced pain [54].

Nobiletin and andrographolide, which are plant-derived anti-NF-κB drugs, can remarkably improve response latency in animal models of endometriosis, confirming the potential of NF-κB as a target for reducing endometriosis-induced pain [87, 88].

NF-κB and infertility

In a study of 35 cases (15 infertile patients with endometriosis, 10 infertile patients with nonendometriotic ovarian cysts, and 10 healthy fertile women), the mean expression of NF-κB1 was remarkably higher in the ectopic endometrium of infertile patients with endometriosis than in the endometria of patients with nonendometriotic cysts and fertile patients [89]. After the surgical removal of endometrioma, the expression of NF-κB1 markedly decreased in endometriosis patients, suggesting that the overexpression of NF-κB in eutopic endometrium may contribute to endometriosis-associated infertility [89]. According to the results of another genetic association study of 438 cases (172 infertile patients with endometriosis, 77 cases of idiopathic infertility, and 189 healthy women), the 94 insertion/deletion ATTG polymorphism in the NFKB1 gene was positively correlated with endometriosis and idiopathic infertility [90]. More investigations should be performed to explore the relationship between NF-κB activation and the high infertility risk of patients with endometriosis.

Preclinical drugs for blocking NF-κB signaling in endometriosis

Preclinical in vivo and/or in vitro experiments have discovered a large number of drugs that inhibit NF-κB signaling and thus alleviate the development of endometriosis (Table 1) [13, 14, 16, 18, 19, 36, 46, 67, 75, 87, 88, 91-119]. In this section, we discuss the effects of some of these drugs on endometriotic cells/endometriosis-like lesions and the relevant mechanisms. We also predicted potential drugs that may affect NF-κB signaling in endometriosis through the Drug-Gene Interaction Database (DGIdb) (http://www.dgidb.org/) [120] to provide more potential drug treatment options for researchers.

Plant-derived medicines

Numerous studies have shown that plant extracts are a source of novel therapeutic methods for endometriosis [121], and NF-κB signaling was identified as the target of some of these plant-derived medicines [13, 14, 16, 19, 67, 87, 88, 91-100, 117, 118]. Curcumin derived from the rhizomes of Curcuma plants can repress TNFα/IL1β-induced NF-κB activation in human endometriotic cells, resulting in the reduced secretion of proinflammatory cytokines, such as IL6, IL8, and MIF, and the reduced expression of chemokines, such as MCP-1, and cell adhesion molecules, such as ICAM-1 and VCAM-1 [13, 14, 19]. In addition, in vivo experiments revealed that curcumin can also inhibit MMP3-dependent FasL-induced local immune cell death in the endometriotic milieu partly by suppressing NF-κB activation, which prevents the formation of the immune-tolerant environment in initial endometriotic development [99].

Andrographolide, an active ingredient extracted from Andrographis paniculate, is a potent NF-κB inhibitor in endometriosis. Mechanistically, andrographolide attenuates the DNA-binding activity of NF-κB and the expression of its downstream genes COX-2, TF, and NGF, suppressing the proliferation of endometriotic cells and reducing the size of ectopic lesions [88]. A recent study also found that the perioperative use of β-blockers and/or andrographolide can effectively inhibit the growth of residual lesions in a BALB/c mouse model of endometriosis, indicating the potential value of andrographolide in reducing the recurrence risk of endometriosis [100].

In addition to curcumin and andrographolide, other plant-derived medicines, such as ginsenoside Rg3, baicalein, costunolide, imperatorin, 6-shogaol, octyl gallate, parthenolide, HEABG, nobiletin, Artemisia princeps extract, glycyrrhizin, and Cypri rhizoma extract, also inhibit inflammation and endometriotic cell proliferation by suppressing NF-κB signaling [16, 67, 87, 91-97, 117, 118]. However, the exact mechanisms need further exploration.

NF-κB inhibitors

BAY 11-7085 is a synthetic compound that suppresses IκBα phosphorylation and prevents the release and nuclear translocation of NF-κB [122]. BAY 11-7085 treatment can remarkably inhibit DNA synthesis and the proliferation of endometriotic cells and induce cell apoptosis by activating caspase-mediated apoptosis [101]. SN50, a cell-permeable NF-κB inhibitory peptide, consists of a membrane-translocating motif and a nuclear localization sequence derived from the NF-κB p50 subunit, which specifically inhibits the nuclear translocation of NF-κB [123]. NF-κB inhibition through BAY 11-7085 or SN50 treatment reduced endometriotic lesions and diminished the initial development of endometriosis in a nude mouse model of endometriosis [102].

Pyrrolidine dithiocarbamate (PDTC), a diethyl derivative of dithiocarbamates, is another potent NF-κB inhibitor. It inhibits NF-κB signaling by repressing IκBα phosphorylation, nuclear p65 protein expression, and the DNA-binding activity of NF-κB subunits in endometriotic cells [105]. The expression of NF-κB target genes/molecules in endometriotic cells is also inhibited by PDTC treatment, which may suppress the proliferation (PCNA, CD31, CD34, Ki67, and survivin), angiogenesis (VEGF), adhesion (CD44), and migration/invasion (MMP2, MMP9) of endometriotic cells and reduce inflammatory responses (COX-2, PGE2) [75, 103-105].

Other known drugs

Pioglitazone is a peroxisome proliferator-activated receptor γ ligand that can inhibit TNFα-induced IL-8 expression and endometriotic cell proliferation by suppressing NF-κB signaling [18]. Notably, activation of the TNFα/NF-κB/IL8 pathway in endometriotic cells can also be inhibited by hormone or thalidomide treatment, providing other choices for blocking NF-κB signaling in endometriosis [46, 108, 109]. BV6 is a small-molecule antagonist of inhibitors of apoptosis proteins (IAPs) that are activated by NF-κB signaling in endometriosis. BV6 causes the proteasomal degradation of IAPs and suppresses their expression; thus, it inhibits endometriotic cell proliferation in vitro and the growth and inflammation of murine endometriosis-like lesions in vivo [110, 111].

Niclosamide is an antihelminthic drug used to treat parasitic infections. Recent studies have demonstrated that niclosamide can suppress macrophage-dependent endometriotic cell viability and cytokine/chemokine secretion through STAT3 and NF-κB signaling, but its therapeutic effect needs to be verified in animal models of endometriosis [114, 115].

Potential drugs

The druggability of NF-κB signaling-related genes was described using DGIdb, and potential drug-gene interactions were visualized using Cytoscape [124]. The results showed that RELA and NFKB1, two key NF-κB signaling-related genes, were theoretically regulated by 25 and 16 drugs, respectively (Figure 5). Among these drugs, four NF-κB inhibitors, namely, isoliquiritigenin, isorhamnetin, parthenolide, and rutin, prevented inflammatory responses and inhibited the development of endometriosis in preclinical studies [97, 125-127]. Other drugs, including dehydroxymethylepoxyquinomicin, edasalonexent, acacetin, artesunate, chrysoeriol, cudraflavone B, cynaropicrin, N-(3-oxododecanoyl) homoserine lactone, quercetagetin, sorbinil, tamarixetin, diosmetin, laquinimod, and triptolide, also have inhibitory effects on the NF-κB signaling-induced inflammatory response; thus, their effects on endometriosis need further exploration [128-136].

Discussion and Conclusion

Stimulated by proinflammatory factors, such as IL1β and TNFα, NF-κB signaling is overactive in ectopic endometrial tissues and enhances the proliferation, adhesion, migration, and invasion abilities of endometriotic cells. In addition, NF-κB signaling is involved in the crosstalk between endometriotic cells and PMs, as well as the regulation of PM polarization to affect endometriosis progression.

Estrogen plays a key role in regulating NF-κB signaling in endometriosis and has promoting and inhibitory effects. Progesterone has a clear inhibitory effect on NF-κB activity, and hormone therapies, such as GnRHa and progesterone treatment, can remarkably inhibit NF-κB-related inflammatory responses in endometriotic cells.

Oxidative stress is a key inducer of NF-κB signaling in endometriotic cells by activating the HMGB-1/TLR4/NF-κB axis and inducing iron overload. NF-κB signaling can in turn contribute to oxidative stress by activating NOS/NO signaling and decreasing the expression of antioxidant enzymes. NcRNAs, such as miRNAs and lncRNAs, are abundantly found in the human endometrium and were recently identified to regulate the expression of NF-κB-related genes in endometriotic cells.

In patients with endometriosis, the activation of NF-κB signaling is associated with endometriosis-related pain and infertility. In preclinical studies of endometriosis, plant-derived drugs, NF-κB inhibitors, and other known drugs have been widely evaluated and have shown potent anti-NF-κB effects that alleviate disease progression. Other drugs that have the potential to target NF-κB-related molecules are predicted in this review using DGIdb.

Notably, most NF-κB-related endometriosis studies chose normal/ectopic endometrial stromal cells for subsequent experiments. However, several studies also revealed that the role of NF-κB in endometrial epithelial cells shares several similarities with its role in endometrial stromal cells, such as the regulation by TNFα, estrogen signaling, and ncRNAs [24, 31, 61]; the promotion of cell proliferation, migration, invasion, and adhesion [56, 73, 74]; and the contribution to the resistance of ROS stress-induced cell apoptosis [56]. In addition, several drugs exert anti-endometriotic effects by downregulating NF-κB expression in endometrial epithelial cells [67, 93, 117-119].

 Figure 5 

Potential interactions between drugs and key NF-κB signal-related genes, RELA and NFKB1. Drugs with an interaction score ≥ 0.2 were screened out. Triangles with sizes from small to large and colors from light to dark represent interaction scores from low to high.

In conclusion, aberrant NF-κB signaling is involved in several aspects of endometriosis pathogenesis. Future studies should discover and develop more drugs that inhibit NF-κB signaling and further test their efficacy in clinical trials.

Abbreviations

NF-κB: nuclear factor-kappa B; IL1: interleukin1; IL6: interleukin 6; IL8: interleukin 8; RANTES: regulated on activation normal T cell expressed and secreted; MIF: macrophage migration inhibitory factor; ER: estrogen receptor; CXCL12: C-X-C motif chemokine 12; CXCR4: C-X-C chemokine receptor type 4; PI3K/Akt: phosphoinositide 3-kinase/ protein kinase B; PTEN: phosphatase and tensin homolog; MAPK/ERK: mitogen-activated protein kinases/extracellular signal-regulated kinase; GnRHa: gonadotrophin-releasing hormone analogues; NAD: nicotinamide adenine dinucleotide; XIAP: X-linked inhibitor of apoptosis; Bcl-2: B-cell lymphoma 2; Bcl-xL: B-cell lymphoma-extra-large; JNK: jun N-terminal kinase; CCL17: C-C motif chemokine 17; CCL 2: C-C motif chemokine 2; TRPA1: transient receptor potential ankyrin 1; TRPV1: transient receptor potential vanilloid-1; MYD88: myeloid differentiation factor-88 adaptor protein; MCP1: monocyte chemoattractant protein 1; TF: tissue factor; NGF: nerve growth factor; COX2: cyclooxygenase-2.

Acknowledgements

Funding

This work was supported by the National Key R&D Program of China (grant number 2017YFC1001202) and the National Natural Science Foundation of China (grant numbers 81974225 and 82171636).

Author contributions

YML took part in the conception of this review, drafted the manuscript and prepared the figures. JZW and XMZ revised the article and performed the final approval of the version to be submitted.

Competing Interests

The authors have declared that no competing interest exists.

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Author contact

Corresponding author: Department of Gynecology, Women's Hospital, School of Medicine, Zhejiang University, Xueshi Road, Hangzhou 310006, China. Zhejiang Provincial Key Laboratory of Precision Diagnosis and Therapy for Major Gynecological Diseases, Women's Hospital, Zhejiang University School of Medicine, Hangzhou 310006, China. Tel: 86-571-87061501-2131; E-mail: zhangxinmedu.cn

Received 2022-3-8
Accepted 2022-6-12
Published 2022-7-4

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