Transmembrane TNF-alpha reverse signaling leading to TGF-beta production is selectively activated by TNF targeting molecules: Therapeutic implications

Tumor necrosis factor (TNF)-alpha is a potent pro-inflammatory cytokine exerting pleiotropic effects on various cell types. It is synthesized in a precursor form called transmembrane TNF-alpha (mTNF-alpha) which, after being processed by metalloproteinases, is released in a soluble form to mediate its biological activities through Type 1 and 2 TNF receptors in TNF receptor expressing cells. In addition to acting in soluble form, TNF-alpha also acts in the transmembrane form both as a ligand by activating TNF receptors, as well as a receptor that transmits outside-to-inside (reverse) signals back into mTNF-alpha bearing cells. Since the discovery that TNF-a plays a determining role in the pathogenesis of several chronic inflammatory diseases, anti-TNF agents are increasingly being used in the treatment of a rapidly expanding number of rheumatic and systemic autoimmune diseases, such as rheumatoid arthritis, Crohn's disease, psoriasis, psoriatic arthritis, ankyloting spondylitis, Wegener granulomatosis and sarcoidosis. There are 5 TNF antagonists currently available: etanercept, a soluble TNF receptor construct; infliximab, a chimeric monoclonal antibody; adalimumab and golimumab, fully human antibodies; and certolizumab pegol, an Fab' fragment of a humanized anti-TNF-alpha antibody. Though each compound can efficiently neutralize TNF-alpha, increasing evidence suggests that they show different efficacy in the treatment of these diseases. These observations indicate that in addition to neutralizing TNF-alpha, other biological effects induced by TNF-alpha targeting molecules dictate the success of the therapy. Recently, we found that mTNF-alpha reverse signaling leads to transforming growth factor (TGF)-beta production in macrophages and anti-TNF agents selectively trigger this pathway. In this review we will focus on the potential contribution of the activation of the mTNF-alpha signaling pathway to the success of the anti-TNF therapy. (C) 2016 Elsevier Ltd. All rights reserved.