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ARTICLE IN PRESS Pharmacological Research xxx (2015) xxx–xxx

Contents lists available at ScienceDirect

Pharmacological Research journal homepage: www.elsevier.com/locate/yphrs

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Editorial

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Novel therapies for T1D on the horizon

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Keywords:

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Type 1 diabetes NOD mice Immunotherapy Stem cells Immunosuppression

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Although many progresses have been made in the treatment of hyperglycemia and management of diabetic complications, a feasible and safe cures capable of normalizing hyperglycemia in individuals with type 1 diabetes (T1D) is needed [1–4]. Being conceived as a progressive autoimmune disease [5], T1D is characterized by an autoreactive T cells-mediated autoimmune and selective destruction of insulin producing ␤-cells [6]. The prevalence of T1D has increased by 2–5% worldwide and reached approximately one every 300 in US by 18 years of age [7]. Recent studies conducted by different and independent groups suggested that T1D is still associated with an increased mortality risk [8], albeit an overall improvement of quality of life was observed after the introduction of more accurate insulin therapy regimen and of new insulin analogues, as revealed by a significant decrease of diabetic ketoacidosis-associated mortality [9]. The introduction of intensive insulin therapy in large clinical trials (e.g.; the DCCT study), established the proof-of-concept that a better and strict management of T1D-associated hyperglycemia leads to the reduction of major diabetic complications, with a decrease of the risk of developing diabetic retinopathy by 76%, nephropathy by 50% and neuropathy by 60% [10]. Yet, whether mortality in T1D is improved by intensive insulin therapy remains still controversial, since numerous studies claimed recently that the mortality rate associated to T1D is still high despite the whole progress in the management of glycometabolic control and in the treatment of cardiovascular risk factors [11]. This striving point was nicely pointed out in a recent published study by Lind and colleagues, in which the relationship between all-cause and cardiovascular associated mortality and improved glycemic levels was analyzed in individuals with T1D compared to their peers controls without T1D [8]. Authors reported that T1D individuals with an excellent glycemic control (as revealed by HbA1c < 6.9%) were exposed to a two fold increased risk of overall mortality and a threefold CVD-associated mortality risk [8,11]. This surprising finding ascertains that improving glycemic control is not enough, and that in order to achieve the best possible option in the management of the disease, we must identify other risk factors, search for biomarkers of disease progression and potentially

look for therapy capable of inducing the complete remission of T1D [12,13]. Recently, Livingstone and his collaborators published new data regarding life expectancy for adults with T1D and revealed that women and men at the age of 20 years old may expect to live 12.9 and 11.1 years respectively fewer than their corresponding healthy controls. Even those T1D individuals with a preserved renal function may face an estimated 8-year reduction of life expectancy [14]; this was partially corrected by Orchard and colleagues, that reported a similar mortality rate in T1D with no renal associated disease and individuals free from T1D. Furthermore, Orchard et al. [15] showed that the overall mortality associated risk in the intensive insulin therapy-treated group was only modestly reduced as compared with the conventional therapy-treated group in an observational long-term follow up of a selective North American cohort who participated in the DCCT and EDIC study. Authors observed a modestly lower all-cause mortality rate with a small absolute reduction risk as about 1/100 patient-years after 6.5 years of initial intensive diabetes therapy [15]. All together, these results underscore the big challenge that still remains in order to strive against T1D, the improvement of glycometabolic control through intensification of insulin therapy is one of the targets of the fight against T1D and may actually result in the increase in life threatening events due to the augmented incidence of hypoglycemia [16]. In this special issue of Pharmacological research we are exploring the state-of-the-art of novel therapies currently under evaluation for T1D individuals. Nowadays therapeutic options for T1D include islet and pancreas transplantation [17,18], which could restore normoglycemia at different degrees and for a different period of time without any resurgent risk of hypoglycemia [17,19] and may prevent, halt, or reverse the development or progression of secondary diabetes complications [18,20,21]. However, the high rate of immunological graft failure with both procedure, the shortage of donors [22], the absence of reliable and strong markers of rejection [23] and the risk of chronic long-term immosuppressive regimen, limited the establishment of pancreas and islet transplantation as alternatives options for diabetes’ treatments [18,24]. The hype related to the successful preclinical studies in the NOD mice, was unfortunately accompanied by the failure to translate these immunotherapies to humans [2]. The main differences reside in the heterogeneity of the disease in humans, the need for a better optimization of the dosing and issues related with the timing of intervention which needs to be better explored [2,25]. Novel pathways involved in the onset of T1D have been identified thanks to the use of NOD mice [26–29], that led to the creation of few approaches capable of reverting hyperglycemia in NOD mice [30–35]. Novel

http://dx.doi.org/10.1016/j.phrs.2015.03.019 1043-6618/© 2015 Published by Elsevier Ltd.

Please cite this article in press as: M. Ben Nasr, P. Fiorina, Novel therapies for T1D on the horizon, Pharmacol Res (2015), http://dx.doi.org/10.1016/j.phrs.2015.03.019

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and unexpected pathways are under investigation for their role either in alloimmune response or in inflammation [30,36–38]. The use of stem cells recently held great promise for the cure of T1D; indeed stem-cell-based therapy in T1D can halt the autoimmune response generated against insulin-producing cells [31,39,40] and potentially can sustain ␤-cell replenishment [41,42]. The use of regulatory T cells, may appear another exciting field to be explore as well, once solved the issue of poor half-life and stability [43,44]. This special issue focuses on the different approaches tested so far for the modulation of the immune response in patients with T1D, shedding a light of hope into the future of this devastating disease.

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Moufida Ben Nasr a,b Q1 Paolo Fiorina a,b,∗ a Nephrology Division, Boston Children’s Hospital, Harvard Medical School, Boston, MA, United States Q2 b Transplant Medicine, San Raffaele Hospital, Milan, Italy ∗ Corresponding

author at: Nephrology Division, Boston Children’s Hospital, Harvard Medical School, Enders Building 5th floor, Room EN511, 300 Longwood Ave., Boston, MA 02115, United States. Tel.: +1 617 919 2624; fax: +1 617 730 0365. E-mail address: paolo.fi[email protected] (P. Fiorina) Available online xxx

Please cite this article in press as: M. Ben Nasr, P. Fiorina, Novel therapies for T1D on the horizon, Pharmacol Res (2015), http://dx.doi.org/10.1016/j.phrs.2015.03.019

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