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Muth, K.N.; Rech, J.; Losch, F.O.; Hoerning, A. Tumor Necrosis Factor-α Inhibitors. Encyclopedia. Available online: https://encyclopedia.pub/entry/47940 (accessed on 17 May 2024).
Muth KN, Rech J, Losch FO, Hoerning A. Tumor Necrosis Factor-α Inhibitors. Encyclopedia. Available at: https://encyclopedia.pub/entry/47940. Accessed May 17, 2024.
Muth, Katharina N., Juergen Rech, Florian O. Losch, André Hoerning. "Tumor Necrosis Factor-α Inhibitors" Encyclopedia, https://encyclopedia.pub/entry/47940 (accessed May 17, 2024).
Muth, K.N., Rech, J., Losch, F.O., & Hoerning, A. (2023, August 11). Tumor Necrosis Factor-α Inhibitors. In Encyclopedia. https://encyclopedia.pub/entry/47940
Muth, Katharina N., et al. "Tumor Necrosis Factor-α Inhibitors." Encyclopedia. Web. 11 August, 2023.
Tumor Necrosis Factor-α Inhibitors
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This entry is adapted from the peer-reviewed paper 10.3390/jcm12155039

Immune-mediated inflammatory diseases, such as rheumatoid arthritis, psoriatic arthritis, peripheral and/or axial spondyloarthritis, Crohn’s disease, and ulcerative colitis, are characterized by molecular and cellular changes in the immune system. Due to the systemic nature of these diseases, organs such as the liver or cardiovascular system are often affected by the inflammatory process. Tumor necrosis factor-α inhibitor therapy reduces the activation of pro-inflammatory signaling cascades, mitigates the chronic inflammatory process by restoring cellular balance, and alleviates clinical consequences, such as pain and tissue damage.

cytokines immune-mediated inflammatory diseases inflammation rheumatoid arthritis crohn's disease colitis ulcerosa tumor-necrosis alpha inhibitor

1. Tumor Necrosis Factor-α Inhibitor Therapy Restores Cytokine Balance and Normalizes Organ Function

TNF-α inhibitors can counteract the entire disease process in patients with chronic inflammatory diseases (e.g., RA, psoriatic arthritis (PsA), CD, and ulcerative colitis (UC)) by fundamentally modulating the molecular and cellular changes of several inflammatory networks of the innate immune system [1][2][3][4][5][6][7]. The focus is on the reduction of TNF-α due to TNF-α inhibitors and the subsequent pro-inflammatory cytokines, such as IL-1, IL-6, or IFN-γ [3][5][6][7], and, thus, the restoration of cellular homeostasis. The decrease in these pro-inflammatory cytokines leads to the normalized differentiation of T cell subtypes, which increases the number of anti-inflammatory cells (e.g., Treg cells and anti-inflammatory TH17 cells) and reduces the number of pathogenic TH17.1 cells [3][8][9]. Treg cells can now exert their suppressing function by releasing the anti-inflammatory cytokines IL-10 and TGF-β, which subsequently influence cytokine release by effector T cells (Figure 1). In IBD patients, it has been shown that therapy with a TNF-α inhibitor can also exert a modulating effect on specific subtypes of B lymphocytes (CD24hiCD38hi-B cells). The inhibition of TNF-α leads not only to a numeric reconstitution of B cellular subset distribution, but also achieves a normalization of IL-10 production. This observation reflects at least a reconstitution of the immune system [10]. Further studies have shown that a restoration of B cell numbers correlated with the biological response to the TNF-α inhibitor therapy [11][12]. Regarding the reconstituting effect, earlier studies have provided evidence that infliximab exerts its anti-inflammatory effects by modifying the IBD-characteristic cytokine networks. Ringheanu and colleagues found that infliximab downregulated the production of inflammatory cytokines by showing that monocytes produced less TNF-α, IL-1β, IL-6, and IL-8 mRNA, as measured at the RNA and protein level [13]. In addition, activated T cells isolated from colonic biopsies of patients with CD cultured in the presence of infliximab were found to decrease their expression of IFN-γ [14].
Jcm 12 05039 g003 550
Figure 1. Therapy with a TNF-α inhibitor restores the cytokine balance in chronic inflammatory diseases and, thus, also the cellular balance. Abbreviations: IFN, interferon; IL, interleukin; TGF, tumor necrosis growth factor; TH, T helper cell; TNF, tumor necrosis factor; Treg, regulatory T cell. The size of the cytokines depicted schematically represents their released amount.
Further findings indicate that in IBD, TNF-α blockage has been shown to result in reduced intestinal permeability through decreased endothelial cell apoptosis and decreased permeability of tight junctions, increased Treg cell activity, reduced activity of various inflammatory mediators and T cells, and a reduction in inflammation-mediated mucosal angiogenesis by preventing the production of vascular endothelial growth factor A from intestinal fibroblasts [15][16].
Following the treatment of RA patients with infliximab, a restored population of Treg cells expressing low levels of CD62L was identified that mediates the suppression of T effector cells via TGF-β and IL-10, resulting in reduced IFN-γ production [17]. Patients clinically responding to the fully humanized anti-TNF-α antibody adalimumab also showed an increased percentage of FoxP3+ cells with restored regulatory function, as these cells suppress and resist conversion to TH17 cells [18].
Studies investigating the effects of anti-TNF-α therapy for B cell subsets in RA are scarce and yielded, in part, similar results when compared to the IBD setting. The frequency and the absolute number of mature/memory (CD24hiCD27+) cells, of immature (CD24hiCD38hi) transitional B cells, and of IL-10-producing Breg cells have been shown to be decreased in RA versus healthy controls, and increased after therapy with MTX together with the anti-TNF-α inhibitors, adalimumab or etanercept [19][20][21][22].
Consequently, the inhibition of TNF-α attenuates inflammatory reactions and allows anti-inflammatory signaling pathways to prevail again, giving the chance for a restoration of the homeostatic immunological balance [3][5][6][8][9][23]. TNF-α inhibitors also reduce the expression of molecules involved in chemotaxis, invasion, and the adhesion of immune cells at the site of inflammation, thereby reducing local inflammatory processes [6][8][24].
Therapy with TNF-α inhibitors can thus be used to break the vicious cycle of chronic inflammation early and effectively [25][26], since TNF-α blockade weakens several inflammatory networks and promotes anti-inflammatory processes [5][6][7][8][9][10][27]. Consequently, the blockade of TNF-α has a systemic effect and is not restricted to a specific inflammatory disease, which is why the development of further organic manifestations can be prevented and chronic comorbidities can be treated efficiently [1][2][28][29][30][31]. In contrast, the therapeutic inhibition of other pro-inflammatory cytokines, such as IL-1, IL-6, or IL-17/23, only affects downstream networks and, therefore, has a narrowly defined mode of action in the inflammatory process [2].
In the case of the liver, therapy with a TNF-α inhibitor can thus be associated with the normalization of liver function and lead to an improvement in hepatic cytochrome activity, since lower concentrations of inhibitory cytokines, such as IL-6 and IL-1Ra, are present [6][32][33][34][35][36][37][38]. In addition, TNF-α inhibitors cause a reduction in acute-phase proteins, such as fibrinogen, haptoglobin, hepcidin, and serum amyloid A in the liver [30][39][40].
Therapy with TNF-α inhibitors can reduce the risk of overall cardiovascular events, myocardial infarction, and serious venous thrombotic events (VTE) in RA patients [41]. The normalization of fibrinogen and thrombocytosis and the reduction of the expression of vascular endothelial growth factor, as well as of oxidative stress and endothelial dysfunction, by TNF-α inhibitors may reduce the relevant risk factors for atherosclerosis and cardiovascular events in patients with chronic inflammatory disease and increased cardiovascular risk, such as in RA [23][39][41][42][43]. Patients with IBD are at increased risk of thrombotic events. Thus, the epidemiological aspects and drug-related risks of venous (VTE) and arterial thrombotic events (ATE) were summarized in the Evidence-Based Guideline in order to provide recommendations for the optimized medical treatment of IBD patients. The Evidence-Based Guideline concluded that TNF-α inhibitors are associated with a decreased risk of VTE and arterial events, implicating a potentially protective role of TNF-α inhibitors against VTE in IBD patients [44]. In this regard, csDMARDs and JAK-inhibitors indicated for the treatment of chronic inflammatory diseases are associated with increased risks of cardiovascular events and VTE in comparison to TNF-α inhibitors [45][46].
CD is also associated with an increased risk of osteoporosis. A retrospective analysis suspected that TNF-α inhibitor therapy in post-menopausal/estrogen-deficient patients could prevent osteoporosis but further studies are needed for clarification of the impact of TNF-α inhibitors [47]. Therefore, organ functions and the general clinical condition of the patient improve due to the balance of pro-inflammatory and anti-inflammatory factors restored by therapy with a TNF-α inhibitor [35][36][39][40]. Notably, the comorbidities of patients with chronic inflammatory diseases need to be considered in treatment decision-making. Expert recommendations for the detection and monitoring of comorbidities in the treatment of psoriasis, PsA, and RA patients were developed to provide further guidance on achieving improved disease outcomes [48][49].

2. Tumor Necrosis Factor-α Inhibitor Therapy and Its Clinical Impact

With infliximab as the first biologic agent approved for the therapy of CD in 1998, TNF-α inhibitors have a long history regarding the treatment of chronic inflammatory diseases. By gaining approval in increasing numbers of indications, TNF-α inhibitors soon became an attractive treatment option for numerous chronic inflammatory diseases. TNF-α is involved at each stage of the pathogenesis of autoinflammation through its control of multiple cytokine networks and their activity. Hence, the blockade of TNF-α crucially results in the omission of subsequent pro-inflammatory signaling pathways regulated by subordinate cytokines. TNF-α inhibitors interrupt the cycle of inflammation early and effectively, thus, preventing the formation of comorbidities. For example, the development of extra-intestinal manifestations in pediatric CD patients could be significantly reduced, or even prevented, by the early use of infliximab [29][30][50].
Currently, five different TNF-α inhibitors of chronic inflammatory diseases are available: infliximab, etanercept, adalimumab, certolizumab pegol, and golimumab. Although all TNF-α inhibitors are designed to bind TNF-α, they have different molecular structures, which translate into different pharmacokinetic properties, binding affinities, as well as dosage regimens (Supplementary Table S1) [51]. Precisely, infliximab, adalimumab, and golimumab are anti-TNF-α monoclonal antibodies (mAbs), whereas certolizumab pegol is a pegylated single Fab’ antibody fragment and etanercept is a fusion protein, in which TNF receptor 2 is fused to the human IgG1-Fc domain. Adalimumab has the broadest spectrum of therapeutic approvals, ranging from uveitis and IBD to hidradenitis suppurativa; thus, patients with chronic inflammation manifested in various organ systems, such as PsA patients, could be treated with only one drug. Here, adalimumab demonstrates efficacy in several domains, i.e. peripheral arthritis, axial involvement, enthesitis, and dactylitis, as well as extra-articular manifestations [52].
Because TNF-α inhibitors have been on the market for a long time, their safety profiles for vulnerable patient populations, such as pediatric patients, can also be extensively established. Importantly, as chronic diseases mainly last for the whole lifetime, the effect of TNF-α treatment on the further course of the disease, and also with regard to the total health of pediatric patients, is of great relevance. It is therefore worth mentioning that TNF-α inhibitors are currently the only biologic drug approved for the anti-inflammatory therapy of pediatric patients suffering from IBD.
Furthermore, the early application of biologic agents significantly prevents treatment failure in pediatric IBD [29]. In 2020, a randomized trial directly comparing first-line infliximab with exclusive enteral nutrition or corticosteroids as a first-line treatment in pediatric patients with moderate-to-severe CD was provided by Jongsma and colleagues [25]. Of the patients treated with first-line anti-TNF-α therapy, a significantly higher percentage achieved clinical and endoscopic remission. In addition, first-line TNF-α-blocker therapy needed less dose escalation while achieving mucosal healing [25]. In addition, the probability of continued clinical remission at week 52 with azathioprine monotherapy was higher in children who received infliximab as a first-line remission-inducing therapy. Comparable results were shown for adalimumab [26].
TNF-α inhibitors have long been established for the treatment of JIA, and data for treatment duration of more than 10 years is available confirming its effectiveness and tolerability in children and adolescents [53]. This understanding and practical experience, especially for the treatment of children, is missing for other biological treatments that have recently been developed and approved, such as Janus kinase (JAK) inhibitors, where data collection on efficacy and safety is still ongoing.
Therapeutic strategies such as “hit hard and early” and “treat-to-target”, especially with TNF-α inhibitors, can modulate the course of the disease enormously, as they have been shown to lead to drug-free remission, lower disease activity, and higher functional status, which ultimately leads to an improvement in patients’ quality of life [54][55][56].
In CD, the early and effective use of TNF-α inhibitors has also been shown to prevent the development of disease complications, for example, strictures or penetrating ulcerations and disease progression, which led to a lower risk of surgery during disease progression and significantly reduced the risk of penetrating complications, but not stenosing complications [50].
The current research data provide evidence that treating patients with inflammatory diseases, such as CD or juvenile idiopathic arthritis (JIA), early after diagnosis with TNF-α inhibitors prevents not only disease progression, but also the loss of structural functioning and other disease complications [50][57]. Especially in young patients, an effective therapy with rapid onset is necessary to prevent growth retardation and structural damage. For pediatric patients with IBD, data from the RISK study demonstrates that patients treated early with TNF-α blockers regain weight and body growth is facilitated [31]. TNF-α inhibitors were shown to induce disease remission within three months, thus, being superior to other immunomodulators [58].
This concept of a “window of opportunity”, meaning that early treatment with TNF-α inhibitors can impact the further disease course, is also established in adult patients suffering from RA, PsA, and CD [59]. In PsA, TNF-α inhibitor treatment can decrease the rate of radiographic progression, thus, reducing structural damage, such as erosion and joint space narrowing [56]. The preservation of structural functions and, consequently, of physical activities is associated with a better quality of life of patients treated with TNF-α inhibitors, as reported by real-world data from PsA patients [55]. In this non-interventional study, TNF-α inhibitors resulted in significant improvements in disease activity indicators, i.e., DAS28-CRP and DAPSA28; in patient-reported outcomes; as well as in the improved working ability of patients [55]. This effect on structural preservation was also shown for etanercept in early RA, where it not only slowed the rate, but even halted the radiographic progression of the disease in most of the patients [55]. The prevention of the further functional disability of the patients allows them to participate in social life and to work, leading to improved well-being and quality of life. Consistently, early therapeutical intervention with biologics, i.e., TNF-α inhibitors, is supported by national and international guidelines for the treatment of patients with moderate-to-severe disabling CD. In a retrospective study, this therapy regimen was shown to positively affect the disease course as more patients achieved endoscopic remission while observing a reduced number of structural behavior issues and surgeries [57]. Thus, TNF-α inhibitors also indirectly contribute to cost savings, as fewer complications and lower hospitalization rates also reduce the burden on the healthcare system [60]. Currently, therapeutic drug monitoring (TDM) is being debated in terms of the management of TNF-α inhibitor therapy for inflammatory diseases, such as RA or IBD. It enables the physician to proactively adapt the therapy algorithm if the patient experiences no clinical response. This precise and individual therapy adjustment can also lead to cost savings in the long term, as the exact amount of biologics can be determined with the avoidance of overtreatment [61].
At present, research is being performed in order to find the most suitable treatment options for the individual patient in clinical practice. As direct head-to-head studies are scarce, several network meta-analyses have compared the various agents approved for their therapeutic utility in treating several inflammatory diseases, i.e., IBD, ankylosing spondylitis (AS), RA, and PsA.
TNF-α inhibitors have proved that they continue to have an enormous relevance in the therapeutic landscape and are still established as therapeutics to control chronic inflammatory diseases despite, the era of newly developed types of treatment. This becomes evident when the different mechanisms of action are examined and compared with regard to their safety profiles and effectiveness.
The observational cohort JAK-pot study analyzed the real world data of four classes (JAK-inhibitors, TNF-α inhibitors, IL-6 inhibitor, abatacept) of second-line treatment approved for RA [62]. Their effectiveness was compared by evaluating the time of and reasoning for drug discontinuation, as well as Clinical Disease Activity Index (CDAI) response rates at 1 year. The key finding was the comparable clinical effectiveness among those four therapeutic agent groups. However, there were differences in the reasons for drug discontinuation, as JAK inhibitors were mainly stopped for safety reasons and less commonly as a result of their ineffectiveness.
As such, a recent study highlighted the importance of TNF-α inhibitors in AS therapy, showing that TNF-α inhibitors were superior to IL-6, -17, -23, and JAK inhibitors regarding efficacy and safety and should be used as the preferred replacement for conventional drug therapy in patients suffering from a rapid disease progression and physical functional limitations [63]. For the treatment of radiographic axSpA (r-axSpA), a direct comparison of the TNF-α blocker adalimumab with the IL-17 inhibitor secukinumab revealed that both biologic agents were comparably efficient in reducing radiographic progression over 2 years [64].

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Subjects: Rheumatology
Contributors MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register :
Katharina N. Muth
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Juergen Rech
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Florian O. Losch
,
André Hoerning
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Revisions: 4 times (View History)
Update Date: 14 Aug 2023
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