TNF inhibitor

A TNF inhibitor is a pharmaceutical drug that suppresses the physiologic response to tumor necrosis factor (TNF), which is part of the inflammatory response. TNF is involved in autoimmune and immune-mediated disorders such as rheumatoid arthritis, ankylosing spondylitis, inflammatory bowel disease, psoriasis, hidradenitis suppurativa and refractory asthma, so TNF inhibitors may be used in their treatment. The important side effects of TNF inhibitors include lymphomas, infections (especially reactivation of latent tuberculosis), congestive heart failure, demyelinating disease, a lupus-like syndrome, induction of auto-antibodies, injection site reactions, and systemic side effects.[1]

The global market for TNF inhibitors in 2008 was $13.5 billion[2] and $22 billion in 2009.[3]

Examples

Inhibition of TNF effects can be achieved with a monoclonal antibody such as infliximab,[4] adalimumab, certolizumab pegol, and golimumab, or with a circulating receptor fusion protein such as etanercept.

Thalidomide and its derivatives lenalidomide and pomalidomide are also active against TNF.

While most clinically useful TNF inhibitors are monoclonal antibodies, some are simple molecules such as xanthine derivatives[5] (e.g. pentoxifylline)[6] and bupropion.[7]

Several 5-HT2A agonist hallucinogens including (R)-DOI, TCB-2, LSD and LA-SS-Az have unexpectedly also been found to act as potent inhibitors of TNF, with DOI being the most active, showing TNF inhibition in the picomolar range, an order of magnitude more potent than its action as a hallucinogen.[8][9][10]

Medical uses

Rheumatoid arthritis

The role of TNF as a key player in the development of rheumatoid arthritis was originally demonstrated by Kollias and colleagues in proof of principle studies in transgenic animal models.[11][12]

TNF levels have been shown to be raised in both the synovial fluid and synovium of patients with rheumatoid arthritis. This leads to local inflammation through the signalling of synovial cells to produce metalloproteinases and collagenase.[13]

Clinical application of anti-TNF drugs in rheumatoid arthritis was demonstrated by Marc Feldmann and Ravinder N. Maini, who won the 2003 Lasker Award for their work.[14] Anti-TNF compounds help eliminate abnormal B cell activity.[15][16]

Therapy which combines certain anti-TNF agents such as etanercept with DMARDs such as methotrexate has been shown to be more effective at restoring quality of life to sufferers of rheumatoid arthritis than using either drug alone.[13]

Skin disease

Clinical trials regarding the effectiveness of these drugs on hidradenitis suppurativa are ongoing.[17]

The National Institute of Clinical Excellence (NICE) has issued guidelines for the treatment of severe psoriasis using the anti-TNF drugs etanercept and adalimumab as well as the anti-IL12/23 biological treatment ustekinumab. In cases where more conventional systemic treatments such as psoralen combined with ultraviolet A treatment (PUVA), methotrexate, and ciclosporin have failed or can not be tolerated, these newer biological agents may be prescribed. Infliximab may be used to treat severe plaque psoriasis if aforementioned treatments fail or can not be tolerated.[18]

Gastrointestinal disease

In 2010 The National Institute of Clinical Excellence (NICE) in the UK issued guidelines for the treatment of severe Crohn's Disease with infliximab and adalimumab.[19]

Cancer

Anti-TNF therapy has shown only modest effects in cancer therapy. Treatment of renal cell carcinoma with infliximab resulted in prolonged disease stabilization in certain patients. Etanercept was tested for treating patients with breast cancer and ovarian cancer showing prolonged disease stabilization in certain patients via downregulation of IL-6 and CCL2. On the other hand, adding infliximab or etanercept to gemcitabine for treating patients with advanced pancreatic cancer was not associated with differences in efficacy when compared with placebo.[20]

Side effects

Cancer

The U.S. Food and Drug Administration continues to receive reports of a rare cancer of white blood cells (known as hepatosplenic T-cell lymphoma or HSTCL), primarily in adolescents and young adults being treated for Crohn's disease and ulcerative colitis with TNF blockers, as well as with azathioprine, and/or mercaptopurine.[21]

Opportunistic infections

TNF inhibitors put patients at increased risk of certain opportunistic infections. The FDA has warned about the risk of infection from two bacterial pathogens, Legionella and Listeria. People taking TNF blockers are at increased risk for developing serious infections that may lead to hospitalization or death due to certain bacterial, mycobacterial, fungal, viral, and parasitic opportunistic pathogens.[22]

Tuberculosis

In patients with latent Mycobacterium tuberculosis infection, active tuberculosis (TB) may develop soon after the initiation of treatment with infliximab.[23] Before prescribing a TNF inhibitor, physicians should screen patients for latent tuberculosis. The anti-TNF monoclonal antibody biologics infliximab, golimumab, certolizumab and adalimumab, and the fusion protein etanercept, which are all currently approved by the FDA for human use, have warnings which state that patients should be evaluated for latent TB infection, and if it is detected, preventive treatment should be initiated prior to starting therapy with these medications.

Fungal infections

The FDA issued a warning on September 4, 2008, that patients on TNF inhibitors are at increased risk of opportunistic fungal infections such as pulmonary and disseminated histoplasmosis, coccidioidomycosis, and blastomycosis. They encourage clinicians to consider empiric antifungal therapy in certain circumstances to all patients at risk until the pathogen is identified.[24] A recent review showed that anti-TNFα agents associate with increased infection risks for both endemic and opportunistic invasive fungal infections, particularly when given late in the overall course of treatment of the underlying disease, and in young patients receiving concomitant cytotoxic or augmented immunosuppressive therapy.[25]

Multiple sclerosis

In 1999 a randomized control trial was conducted testing a TNF-alpha inhibitor prototype, Lenercept, for the treatment of multiple sclerosis (MS). However, the patients in the study who received the drug had significantly more exacerbations and earlier exacerbations of their disease than those who did not.[26]

Case reports have also come out suggesting that anti-TNF agents not only worsen, but cause new-onset multiple sclerosis in some patients. Most recently, a 2018 case report described an Italian man with plaque psoriasis who developed MS after starting entanercept. Their literature review at that time identified 34 other cases of demyelinating disease developing after the initiation of an anti-TNF drug.[27] Thus, anti-TNF drugs are contraindicated in patients with MS, and the American Academy of Dermatology recommends avoiding their use in those with a first degree relative with MS.[28]

Several anti-TNF drugs are commonly prescribed by a number of autoimmune conditions. Some of them have been reported to produce a CNS-demyelination compatible with, and by current knowledge indistinguishable from, standard MS.[29][30]

Several other monoclonal antibodies like adalimumab,[31][32] pembrolizumab,[33] nivolumab,[34] and infliximab[35] have been reported to produce MS artificially.

The risk of anti-TNF-associated demyelination is not associated with genetic variants of multiple sclerosis. In some studies, there were clinical differences to multiple sclerosis as 70% of the patients with anti-TNF-induced demyelination. The symptoms of demyelination do not resolve with corticosteroids, intravenous immunoglobulin or plasma exchange, and is not clear whether MS therapies are effective in anti-TNF-induced demyelination.[36]

Anti-TNF agents in nature

TNF or its effects are inhibited by several natural compounds, including curcumin[37][38][39][40] (a compound present in turmeric), and catechins (in green tea). Cannabidiol[41] and Echinacea purpurea also seem to have anti-inflammatory properties through inhibition of TNF-α production, although this effect may be mediated through cannabinoid CB1 or CB2 receptor-independent effects.[42]

History

Early experiments associated TNF with the pathogenesis of bacterial sepsis. Thus, the first preclinical studies using polyclonal antibodies against TNF-alpha were performed in animal models of sepsis in 1985 and showed that anti-TNF antibodies protected mice from sepsis.[43][44] However, subsequent clinical trials in patients with sepsis showed no significant benefit. It wasn't until 1991 that studies in a transgenic mouse model of overexpressed human TNF provided the pre-clinical rationale for a causal role of TNF in the development of polyarthritis and that anti-TNF treatments could be effective against human arthritides.[45] This was later confirmed in clinical trials[46] and led to the development of the first biological therapies for rheumatoid arthritis.

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