Thalidomide attenuates excessive inflammation without interrupting lipopolysaccharide-driven inflammatory cytokine production in chronic granulomatous disease

https://doi.org/10.1016/j.clim.2013.03.004Get rights and content

Highlights

  • Thalidomide suppressed TNFα-induced NF-κB activation in CGD monocytes.

  • Thalidomide did not interrupt LPS-driven cytokine production in CGD monocytes.

  • CGD monocytes released higher levels of IL-6 and TNF-α in response to LPS.

  • Thalidomide reduced serum level of inflammatory cytokines in CGD colitis patient.

  • Thalidomide did not impact immunity to pathogenic infections in CGD patient.

Abstract

Chronic granulomatous disease (CGD) is a rare inherited disorder characterized by an inability to produce reactive oxygen species, resulting in recurrent life-threatening infections. Curiously, half of the patients with CGD suffer from aseptic bowel inflammation (CGD colitis) due to dysregulated inflammation induced by TNF-α and IL-1β. Thus, developing therapies that regulate excessive inflammatory responses without interrupting antimicrobial immunity would benefit CGD colitis patients. Here, we show that thalidomide suppressed TNF-α-induced NF-κB activation and ATP-induced IL-1β secretion, but did not interrupt the production of IL-1β, IL-6, IL-8, and TNF-α in response to lipopolysaccharide in CGD monocytes. We report on a CGD colitis patient that showed decreased bowel inflammation characterized by reduced serum levels of inflammatory cytokines without evidence of progression of fungal and bacterial infections present at initiation of thalidomide therapy. Our results suggest that thalidomide could be an efficacious therapeutic option for patients with CGD colitis suffering from serious infections.

Introduction

Reactive oxygen species (ROS) generated by cellular nicotinamide adenine dinucleotide phosphate (NADPH) oxidase play an important role in killing microorganisms ingested by phagocytes. In addition, ROS function as pleiotropic signals in various inflammatory contexts. For example, ROS activate nuclear factor-κB (NF-κB), which produces inflammatory cytokines and facilitates formation of the inflammasome consisting of Nod-like receptor family, pyrin domain containing 3 (NLRP3), ASC, cardinal, and pro-caspase-1, which cleaves into caspase-1 and converts pro-interleukin-1β (IL-1β) to IL-1β [1], [2]. Chronic granulomatous disease (CGD) is a primary immunodeficiency resulting from the inability to produce ROS due to defects in NADPH oxidase activity [3]. CGD patients suffer from recurrent infection and frequently develop CGD-associated bowel inflammation (CGD colitis) in the absence of any demonstrable infection [4]. The underlying mechanism of CGD colitis is not fully understood; however, dysregulated inflammatory cytokine production, such as IL-1β and tumor necrosis factor-α (TNF-α), by monocytes and macrophages is thought to contribute to the disease [1], [5]. This concept is supported by many clinical reports that neutralizing anti-TNF-α or immunosuppressive drugs, such as steroids or azathioprine, effectively mitigate CGD colitis clinical symptoms. Notably, the use of these drugs results in an increased susceptibility to severe infections [4], [5].

Thalidomide, originally developed in the 1950s as a tranquilizer, was discontinued when its potent teratogenic effects resulted in catastrophic birth defects in the 1960s. It is recently being reconsidered for its unique and pleiotropic medical effects, such as immunomodulation and anti-inflammatory properties. Thalidomide potentially reduces inflammation by blocking nuclear localization of NF-κB and inhibiting inflammatory cytokine production in patients with chronic inflammatory diseases such as Behcet's disease, rheumatoid arthritis, and Crohn disease [4], [6], [7], [8]. So far, there are case reports regarding three patients with CGD colitis who were treated with thalidomide [4], [9], although the immunomodulatory effect of thalidomide on CGD monocytes has not been described. In this report we show that thalidomide suppressed TNF-α-induced NF-κB activation and adenosine triphosphate (ATP)-induced IL-1β secretion while not interrupting lipopolysaccharide (LPS)-driven inflammatory cytokine production in CGD monocytes. We also show that thalidomide treatment improved bowel inflammation by reducing serum TNF-α levels without increasing susceptibility to infection in a CGD colitis patient.

Section snippets

Monocyte isolation and stimulation

All experiments were performed following receipt of informed consent from patients with X-linked CGD or their parents as part of a protocol approved by the Institutional Review Board of the National Center for Child Health and Development. Monocytes isolated from peripheral blood by an antibody-mediated cell enrichment procedure from RossettSep (StemCell Technologies, Canada) were stimulated with serial concentrations of LPS and with carbonyl cyanide 3-chlorophenylhydrazone (CCCP)

Thalidomide does not block caspase-1 activation or IL-1β production following LPS stimulation in CGD monocytes

Monocytes are capable of activating caspase-1 to process and release IL-1β by LPS signaling through Toll-like receptor 4 (TLR4) [11]. In keeping with these results [12], LPS induced capase-1 activation and IL-1β production in a dose-dependent manner in CGD monocytes as well as in healthy control monocytes (Figs. 1a–c), suggesting that ROS generated by NADPH oxidase was dispensable for caspase-1 activation and conversion of pro-IL-1β to IL-1β. To assess the effect of thalidomide on caspase-1

Discussion

The paradoxical clinical manifestations of CGD, susceptibility to infection and excessive inflammation, make it difficult to choose an appropriate course of therapy for patients with CGD colitis that develops through dysregulated inflammatory cytokine production [19], [20], [21]. The reason for this may be attributed to our insufficient understanding of a role for ROS on inflammasome activation. CGD patient monocytes were predisposed to secrete IL-1β in response to LPS, while CGD patients

Conflict of interest

The authors declare that they have no conflicts of interest.

Acknowledgments

We are grateful to the CGD patients and blood donors for their participation in this study. This work was supported by a Grant-in-Aid for Young Scientists (B) and a Grant from the National Center for Child Health and Development.

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    Thalidomide regulates TNF-α-induced NF-κB activation, but does not interrupt lipopolysaccharide-driven inflammatory cytokine production in monocytes isolated from patients with chronic granulomatous disease.

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