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Pediatric Endocrinology Diabetes and Metabolism
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3/2020
vol. 26
 
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Artykuł oryginalny

Terapia z zastosowaniem przeciwciał przeciwko czynnikowi martwicy nowotworów α – zwiększa ryzyko chorób tarczycy czy chroni przed ich rozwojem?

Aleksandra Furtak
1
,
Anna Wedrychowicz
1
,
Jerzy Starzyk
1

1.
Institute of Paediatrics, Department of Children and Youth Endocrinology, Jagiellonian University Me-dical College, Krakow, Poland
Pediatr Endocrinol Diabetes Metab 2020; 26 (3): 144–149
Data publikacji online: 2020/05/27
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- Anti-tumour necrosis.pdf  [0.42 MB]
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Introduction

Tumour necrosis factor  is an important cytokine of inflammatory and immunological reactions, it is involved in the pathogenesis of many diseases, including autoimmune diseases [1, 2]. This fact has become the basis for the search for new therapeutic options for patients suffering from diseases such as rheumatoid arthritis, psoriatic arthritis, ankylosing spondylitis, psoriasis, or inflammatory bowel diseases. Hence, anti-TNF- drugs were created, the main task of which is to reduce the concentration of TNF- and thereby inhibit the cascade of phenomena occurring in the course of its action, which can lead to the development of the disease. TNF- is also a key factor involved in the pathogenesis of thyroid disease, including AITD.
As is known from the available literature, the incidence of AITD in people with other autoimmune diseases, such as rheumatoid arthritis or inflammatory bowel disease, is increased compared to the general population. Therefore, it would be interesting to know if anti-TNF- therapy of other autoimmune diseases could have an influence on possible development or regression of thyroid gland dys-function, especially AITD.

Aim of the study

The main aim of the study is to assess the effect of anti-TNF- therapy used in inflammatory and autoimmunological diseases on thyroid function and the development of AITD.

Discussion

TNF-, described for the first time by Carswell et al. in 1975, also known as cachectin, is an important cytokine of inflammatory and immunological reactions [1, 2]. The TNF- gene, located on chromosome 6p21.3, consists of four exons, and its promoter region shows very high variability, which determines the differentiated cytokine secretion in individuals [1]. Active TNF- consists of three polypeptide chains, and it is formed as a result of a metalloproteinase (TNF--converting enzyme) action on its precursor synthesised as a transmembrane protein. TNF- is mainly produced by monocytes and macrophages. Its source can also be lymphocytes, mast cells, fibroblasts, keratinocytes, endothelial cells, cardiomyocytes, or thyroid cells [1, 3–5].
The main stimulators of TNF- production are lipopolysaccharides (LPS) of bacterial cell wall. In addition, TNF- synthesis is stimulated by other cytokines such as INF- and IL-1. Also, TNF- in an autocrine manner stimulates its own synthesis. Glucocorti-costeroids, IL-4, IL-10, and PGE2 are inhibitors of TNF- production [1,6].
TNF- has affinity for two types of receptors: TNF-R1 (CD120a, p55 / 60) and TNF-R2 (CD120b, p75/80). They both, in their intracellular part, contain a so-called death domain. TNF-R1 is activated by both free and transmembrane forms of TNF-. TNF-R2 binds mainly to transmembrane forms of TNF-. TNF- receptors also differ in their location: TNF-R1 is located on nuclear cells, and TNF-R2 on immune cells, fibroblasts, and endothelial cells. In addition, expression of TNF- receptors is increased by interleukin 1 (IL-1), interferon  (INF-), IL-2, and TNF- alone [1]. After binding of TNF- to the TNF-R1 receptor, the protein inhibitor SODD (silencer of death domain) is disconnected from the intracellular death domain, which allows activation of the TRADD protein (TNF-R-associated death domain) and further signal transduction steps. These stages can be carried out in three ways, depending on the connec-tion of TRADD with subsequent relays. As a result of the attachment to the TNFR1-TRADD of the FADD (Fas-associated death do-main) adapter protein, the caspase cascade (mainly 8, 3, 7) is activated, which ultimately leads to cell apoptosis [7]. As a result of the attachment to TNFR1-TRADD of RIP (receptor-interacting protein) and/or TRAF2 (TNF receptor-associated factor 2) transmitters, a cascade of kinases is activated, including the B inhibitor kinase (IB), which is released by phosphorylation of IB NF-B cyto-plasm, and its further activities at the level of the cell nucleus primarily lead to cell activation and prevent apoptosis [7]. The third way is through attachment to the TNFR1-TRADD of the TRAF2 adapter protein and the activation of the MEKK1 (Mitogen activated protein kinase/ERK kinase 1) system, which induces the so-called JNK trail (c-Jun N-terminal kinase). The JNK pathway usually leads, through the transcription factor AP-1, to cell stimulation and proliferation. However, there is also evidence of a proapoptotic effect of JNK pathway activation [8].
TNF- is an extremely powerful mediator of inflammatory and immunological reactions. It can act independently or in combi-nation with a wide range of other cytokines, affecting almost all cells in the body. TNF- increases the cytotoxicity and phagocytic pro-perties of cells of the immune system, it affects the proliferation and differentiation of B lymphocytes, T lymphocytes, and NK cells, and increases the synthesis of cytokines. In addition, it induces the expression of MHC I, MHC II, and adhesive particles and chemokines necessary for the accumulation of immune cells at the site of inflammation [1].
The indisputable influence of TNF- on the immune system makes it a key factor in the pathogenesis of many diseases, inclu-ding autoimmune diseases. This fact has become the basis for seeking new therapeutic options for patients suffering from diseases such as rheumatoid arthritis, psoriatic arthritis, ankylosing spondylitis, psoriasis, or inflammatory bowel diseases. As a consequence of the knowledge of this phenomenon, anti-TNF- drugs were created, the main task of which is to directly reduce the concentration of TNF- and thereby inhibit the cascade of phenomena occurring in the course of its action.
TNF- inhibitors are monoclonal antibodies, antibody fragments, or fusion proteins. This group of biological drugs includes the following: infliximab (IFX), which is a monoclonal, chimeric, human-mouse (75%: 25% protein structure) IgG1-class antibody with a molecular weight of 149 kDa; adalimumab (ADA), which is a purely human class antibody; IgG1 with a molecular weight of 148 kDa; certolizumab (CER), which is a humanised Fab fragment (approximately 90% human) of polyethylene glycol conjugated monoc-lonal antibody (PEG); and etanercept (ETA), which is a fusion protein composed of the extracellular portion of the TNFR2/p75 receptor (this portion binds TNF-) fused to the IgG1 Fc fragment [9].
TNF- is also involved in the pathogenesis of thyroid dysfunction, including AITD. As many authors report, the concentration of TNF- and TNF- mRNA in the thyroid tissue in people with AITD and other thyroid gland disorders is definitely higher compared to people without those disorders. Thyroid infiltrating lymphocytes are a reliable source of TNF-; moreover, TNF- production by thyroid cells alone has been reported. Zheng et al. [5] proved that thyroid cells are capable of producing TNF-; Grubeck-Loebenstein et al. [10] did not show the presence of TNF- mRNA in thyroid cells; and Diez et al. [4] showed an increased concentration of TNF- in the thyroid tissue of people with AITD, but they did not specify its source (lymphocytes or thyreocytes). Thyroid cells have receptors for TNF- on their surface, and it is postulated that TNF- plays an essential role in cytotoxic mechanisms leading to the destruction of thyroid tissue in AITD [4]. This cytokine is responsible for the increase in the expression of MHC class I molecules on thyroid cells in Graves’ disease and, together with INF-, for the increase in MHC class II expression [11, 12]. TNF- has been shown to increase IL-6 production by thyroid cells [13]. TNF- affects the tightness of thyreocyte epithelium, which leads to a loss of its barrier function and an increase in the access of immune cells to intravesical antigens [14, 15]. In addition, TNF- inhibits the production of thyroglobulin [16], reduces TSH-induced iodine uptake by thyroid cells [17], reduces type 2 deiodinase activity, which leads to a decrease in periphe-ral production of triiodothyronine from thyroxine, and also reduces autocrine production of triiodothyronine in the thyroid alone [18,19]. TNF- also influences the function of the hypothalamus-pituitary-thyroid axis. TNF- inhibits TRH, which reduces the secretion of TSH [20]. The mechanisms described above are also involved in the pathogenesis of low T3 syndrome (euthyroid sick syndrome), which may accompany severe chronic diseases for which an increase in TNF- is typical [20].
Due to the fact that diseases in which anti-TNF- therapy is used are associated with a higher risk of developing AITD compa-red to the general population [21, 22] and that TNF- plays a role in the aetiopathogenesis of thyroid dysfunction, one would expect that anti-TNF- therapy would have a protective effect against the possible development of AITD, and would be therapeutic if it is present.
There are few reports in the available literature about the development of thyroid dysfunction during anti-TNF- therapy. In addition, it provides very diverse data (Table I). Cerniglia et al. reported the development of hypothyroidism in a 47-year-old patient treated with infliximab for sarcoidosis. The ultrasound image of the thyroid gland corresponded to autoimmune thyroid disease. The authors postulated that the cause of AITD in the patient was the formation of autoantibodies (against infliximab) that induced autoimmu-ne thyroiditis [23]. Lahita et al. described a 55-year-old patient who developed autoimmune thyroiditis during long-term anti-TNF- therapy for psoriatic arthritis. Based on elevated TSH levels before starting anti-TNF- therapy, the authors suggested that autoimmune thyroiditis may have occurred before treatment. Nonetheless, anti-TNF- therapy led to the progression of autoimmune thyroiditis [24]. Van Lieshout et al. are the authors of a report on the development of Graves’ disease in a patient treated with anti-TNF- for rheumatoid arthritis [25]. Similarly, Allanore et al. reported a transient hyperthyroidism lasting one month in a patient after six months of treatment with etanercept [26]. Caramaschi et al. described a group of 54 patients with rheumatoid arthritis, among whom six changed the titre of anti-thyroid peroxidase antibodies (ATPO) or anti-thyroglobulin antibodies (aTG) from negative to positive, and four from positive to negative, after 12 months of therapy with infliximab or etanercept [27]. Atzeni et al., in a study of 20 patients (including six with posi-tive ATPO and eight with positive aTG) with rheumatoid arthritis, showed a change in ATPO from positive to negative in one of the patients after six months of treatment with adalimumab [28]. Pascart et al. examining patients treated with anti-TNF- due to rheumato-logical diseases in their centre, described 11 cases of development of AITD, including six cases of Graves’ disease, three cases of Has-himoto’s disease, and two cases of subacute thyroiditis [29]. Raterman et al., in a group of 138 patients with rheumatoid arthritis, after six months of treatment with adalimumab, described a change in the ATPO titre from positive to negative in one of 21 patients with a positive ATPO at baseline. They also indicated a lower average ATPO concentration after therapy (267 to 201 IU/ml). In addition, two patients with hypothyroidism reported a return to euthyroidism. They also showed a decrease in TSH (from 12.5 mU/l [6.7–18.4] to 7.1 mU/l [4.9–13.8]) in patients with hypothyreosis, who were ATPO positive and not receiving levothyroxine [30]. Elkayam et al., in a study group of 26 patients with rheumatoid arthritis, described a negative ATPO titre in all patients before and after 14 weeks of treat-ment with infliximab [31]. Tarhan et al., in a study of 108 patients with ankylosing arthritis spine (44 received anti-TNF-, 64 received other drugs), reported a positive ATPO titre in 23 patients not treated with anti-TNF- (mean ATPO 86.69 ± 65.28 U/ml), compared to nine patients receiving anti-TNF- (mean TPO 36.61 ±14.02 U/ml) [32]. Paschou et al. studied a group of 41 patients (18 treated with anti-TNF-, 12 treated with other drugs followed by anti-TNF-, 11 treated only with other drugs) with Crohn’s disease or ulcerative enteritis. They found overt or subclinical hyperthyroidism in two patients in the untreated anti-TNF- group and no thyroid dysfunction or AITD in patients receiving anti-TNF-. In addition, they showed the presence of thyroid antibodies in 5.6% of patients treated with anti-TNF- and in 17.4% of those treated with other drugs [33].
Analysing the impact of anti-TNF- therapy on thyroid function and the development of autoimmune thyroid disease, it is also worth paying attention to the role of TNF- and anti-TNF- therapy in thyroid-associated ophthalmopathy (TAO). According to the data, TNF- is involved in the pathogenesis of TAO [34]. For this reason, anti-TNF- therapy is increasingly being used to treat TAO. Paridaens et al., in their pilot study, presented 10 patients with mild to moderate Graves’ ophthalmopathy treated with etanercept for 12 weeks. In this study, 60% of patients had moderate to marked improvement of TAO after this treatment [35]. Boskovic et al. presented a female patient with both Graves’ ophthalmopathy and rheumatoid arthritis, who was treated with etanercept. This treatment led to an improvement of eye symptoms [36]. Komorowski et al. found a positive effect of Infliximab administration on active TAO in a 58-year-old woman with Graves’ disease [37]. These findings suggest that anti-TNF- therapy may benefit patients with TAO, but all of the mentioned authors point out the necessity of larger studies to confirm its efficacy and safety [38].

Conclusions

Research on biological anti-TNF- drugs dates back to the 1990s. According to the cited data, despite the relatively long observation time, the question about the impact of anti-TNF- therapy on the development or regression of AITD remains open. In addition, accor-ding to our knowledge, all available studies concern the adult population. Due to the increasing use of anti-TNF- therapy also in the paediatric population, it seems reasonable to evaluate this group of patients regarding this subject.
In our clinical centre, anti-TNF- treatment of children and adolescents with inflammatory bowel diseases is carried out. We are currently in the process of investigating the effect of anti-TNF- therapy on thyroid gland function and morphology in children and adolescents with Crohn’s disease treated with infliximab. The first preliminary results are promising. They indicate that anti-TNF- treatment may reduce the incidence of AITD in paediatric patients with Crohn’s disease compared to non-biological patients.

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