Invited reviewThe therapeutic potential of interleukin-10 in neuroimmune diseases
Introduction
Neuroimmune diseases are debilitating conditions, which involve substantial loss of quality of life. The key features of these diseases include ongoing inflammation, pain, fatigue, anxiety, and cognitive-impairments, although the etiologies and full range of symptoms of these diseases are quite diverse. Here, we will focus on four neuroimmune diseases as examples of the common etiologies of such pathologies [i.e. neuropathic pain (NP) (nerve trauma), osteoarthritis (OA) (peripheral inflammation), Parkinson's disease (PD) (neurodegeneration), and multiple sclerosis (MS) (autoimmune)]. Treatments for neuroimmune diseases have been developed, but notably, most patients remain either partially or fully refractory to treatment (Ali et al., 2013, Gutierrez et al., 2014, Tarazi et al., 2014b, Taruc-Uy and Lynch, 2013).
The purpose of this review is to explore the potential of interleukin-10 (IL-10)-based therapeutic strategies for the treatment of neuroimmune disease. IL-10 is a potent anti-inflammatory cytokine that is endogenously released by immune cells and glia as a process of negative feedback during inflammation (Kettenmann et al., 2011, Ledeboer et al., 2002, Moore et al., 2001). Importantly, insufficiencies in IL-10 signaling/bioavailability have been implicated in these disease states, and in animal studies, strategies aimed at increasing IL-10 have been effective in treating symptoms and pathology associated with neuroimmune diseases. The signaling pathways and function of IL-10, potential therapeutic benefits of IL-10 in neuroimmune disease, and various strategies aimed at increasing physiological levels of IL-10 will be discussed.
Section snippets
Cellular sources of IL-10
IL-10 was first described by Fiorentino et al. (1989) as a novel immune mediator secreted by T helper 2 (TH2) cells that could inhibit the synthesis of interleukin 2 (IL-2) and interferon-γ (IFN-γ) in TH1 cells. In the periphery, IL-10 is secreted by innate immune cells, including dendritic cells, macrophages, mast cells, natural killer cells, eosinophils and neutrophils, and by adaptive immune cells, including TH1, TH2, TH17 and regulatory T cells (Tregs), as well as B cell subsets (Moore
IL-10 receptor and consequences of IL-10 receptor signaling
As described above, IL-10 is produced in inflammatory cascades, together with classical proinflammatory cytokines, such as TNF and IL-1β. However, regulation of such proinflammatory processes is achieved as a consequence of subsequent IL-10 activity at its cognate receptor (summarized in Fig. 2).
IL-10 exerts its innate and adaptive immune effects through its cognate cell surface receptor complex, a heterotetramer consisting of two IL-10 receptor 1 (IL-10R1) chains and two IL-10 receptor 2
Neuropathic pain
Neuropathic pain (NP) is a debilitating disorder originating from mechanical/chemical tissue damage, infection, or disease to the peripheral and/or central nervous system (CNS), which affects approximately four million people in the United States alone (Taylor, 2006). The common features of NP involve sensory disturbances including spontaneous pain, increased sensitivity to painful stimuli (hyperalgesia), and painful sensitivity to innocuous stimuli (allodynia) (Jensen et al., 2007, Macleod
IL-10 protein
Systemic administration of IL-10 protein is generally not feasible due to the rapid breakdown of the protein and its large size, which renders it incapable of crossing the blood brain barrier (Kastin et al., 2003, Li et al., 1994). In contrast, studies involving direct IT or intranasal administration of IL-10 protein have been mostly successful. However, this route of administration still produces only transient effects due to the rapid clearance of IL-10 protein from intrathecal space
Conclusion
In conclusion, IL-10 is implicated in neuroimmune diseases of varying etiologies such as NP (nerve trauma), OA (peripheral inflammation), PD (neurodegeneration), and MS (autoimmune). A common feature of these disorders is an insufficiency in IL-10 signaling/bioavailability and ongoing inflammation. In animal studies, increasing physiological levels of IL-10 in the context of these diseases has generally been a successful strategy to reduce disease symptoms and associated inflammation. Various
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