Anti-cytokine autoantibodies in postherpetic neuralgia
- Ahmad Bayat†1,
- Peter D. Burbelo†2Email author,
- Sarah K. Browne3,
- Mark Quinlivan4,
- Bianca Martinez3,
- Steven M. Holland3,
- Asokumar Buvanendran5,
- Jeffrey S. Kroin5,
- Andrew J. Mannes1,
- Judith Breuer4,
- Jeffrey I. Cohen6 and
- Michael J. Iadarola1
© Bayat et al. 2015
Received: 11 August 2015
Accepted: 10 October 2015
Published: 20 October 2015
The mechanisms by which varicella zoster virus (VZV) reactivation causes postherpetic neuralgia (PHN), a debilitating chronic pain condition, have not been fully elucidated. Based on previous studies identifying a causative role for anti-cytokine autoantibodies in patients with opportunistic infections, we explored this possibility in PHN.
Sera from herpes zoster (HZ) patients without and with PHN (N = 115 and 83, respectively) were examined for the presence of autoantibodies against multiple cytokines, and other known autoantigens. In addition, a cohort of patients with complex regional pain syndrome or neuropathic pain was tested for autoantibodies against selected cytokines. Antibody levels against VZV, Epstein Barr virus, and herpes simplex virus-2 were also measured in the HZ and PHN patients. Patient sera with high levels of anti-cytokine autoantibodies were functionally tested for in vitro neutralizing activity.
Six PHN subjects demonstrated markedly elevated levels of single, autoantibodies against interferon-α, interferon-γ, GM-CSF, or interleukin-6. In contrast, the HZ and the pain control group showed low or no autoantibodies, respectively, against these four cytokines. Further analysis revealed that one PHN patient with high levels of anti-interleukin-6 autoantibodies had a markedly depressed antibody level to VZV, potentially reflecting poor T cell immunity against VZV. In vitro functional testing revealed that three of the five anti-cytokine autoantibody positive PHN subjects had neutralizing autoantibodies against interferon-α, GM-CSF or interleukin-6. In contrast, none of the HZ patients without PHN had neutralizing autoantibodies.
These results suggest the possibility that sporadic anti-cytokine autoantibodies in some subjects may cause an autoimmune immunodeficiency syndrome leading to uncontrolled VZV reactivation, nerve damage and subsequent PHN.
Varicella-zoster virus (VZV) is a member of the alpha-herpes virus subfamily that causes chickenpox early in life and then remains latent in neurons of sensory ganglia for the lifetime of the individual . In persons with immune deficiencies and in older individuals with a waning immune system, VZV can reactivate causing herpes zoster (HZ), also known as shingles . HZ patients have vesicular, unilateral, painful, dermatomally demarcated skin eruptions that typically resolve in less than 1 month. HZ is quite frequent, and approximately one third of the population may experience zoster once in their lifetime . Adults over the age of 50 are particularly susceptible to HZ , implicating a stronger role of acquired factors compared to genetic influences . One potential consequence of HZ is the development of postherpetic neuralgia (PHN), defined as pain that lasts for greater than 3 months and which originates in the same area as the HZ rash. The frequency of developing PHN has been reported to be approximately 10 % after zoster [5, 6]. Immunocompromised individuals are at higher risk of HZ [7, 8], suggesting an important role of immune surveillance in controlling VZV infection. The Shingles Prevention Study showed that vaccination of elderly persons with a live attenuated varicella-zoster virus vaccine reduced the rates of both zoster and PHN . In a follow-up study, Weinberg et al. showed higher cell-mediated immunity at HZ onset, which correlated with reduced HZ severity and less PHN; in contrast humoral immunity, as reflected by antibodies to VZV at onset of HZ did not correlate with severity of disease . These results indicate a critical function of T-cell-mediated immunity for protection against HZ and PHN.
Recently, we explored the role of anti-cytokine autoantibodies in several diseases by screening patient sera with a panel of recombinant Renilla luciferase cytokine fusion proteins as antigenic probes using the Luciferase Immunoprecipitation Systems (LIPS) technology [11–13]. Using this approach, thymoma patients with opportunistic infections, including some with disseminated VZV infection, demonstrated autoantibodies against interferon-α (IFN-α), interleukin 12p35 (IL-12p35), and several other cytokines . High levels of neutralizing anti-IFN-γ autoantibodies were also detected in patients with disseminated nontuberculous mycobacteria and other opportunistic infections, including both with localized and disseminated VZV reactivation [14, 15]. Based on the late age of onset of PHN, we explored in this study whether anti-cytokine and other autoantibodies, might be associated with PHN. From screening a cohort of HZ patients with and without PHN, high levels of autoantibodies against several different cytokines were detected in six PHN patients. Further analysis revealed that three of the PHN patients had neutralizing anti-cytokine autoantibodies. In one PHN patient with high level anti-IL-6 autoantibodies, antibody responses against VZV were completely absent. The finding that several patients each harbored single, neutralizing autoantibodies against interferon-α, GM-CSF or IL-6 suggests that anti-cytokine immunodeficiency may contribute to development of PHN.
Demographic information for the different study groups
Age (mean ± SD)
On inhaled steroids
47 ± 18.8
61 ± 16.9
39 ± 18.0
60 ± 8.1
LIPS antigens and screening
The antigen targets used for LIPS testing have been previously described [12–14]. An initial autoantibody screen of twenty-four potential autoantigens was performed with a pilot set of 33 PHN patients and 8 healthy controls. These included 13 cytokines (GM-CSF, IL-6, IFN-α, IL-12-p35, IFN-γ, IFN-ω, IFN- λ, IL-12-p40, IL-10, TNF-α, TNF-β, IL-17 and IL-1α), six known autoantigens (Ro52, Ro60, La, RNP-A, Sm-D3 and RNP-70), four neuro-glial proteins, glutamic acid decarboxylase (GAD-65), tyrosine hydroxylase, S100-β, and aquaporin-4, and TRIM-15. Based on the results of the pilot study, 168 additional HZ patients with and without PHN were tested against the most informative targets (Ro52, Ro60, IFN-α, IFN-γ, IL-6, and GM-CSF). All the subjects in the cohort also were evaluated for antibodies against BLRF2 of EBV (p23 capsid), the gE glycoprotein of VZV  and the gG-2 glycoprotein of HSV-2 .
For LIPS autoantibody testing, serum samples were diluted 1:10 in assay buffer A (20 mM Tris, pH 7.5, 150 mM NaCl, 5 mM MgCl2, 1 % Triton X-100), arrayed in 96 deep well microtiter plates, and tested as described . Buffer blanks were used to monitor the performance and background binding activity of the assays. Light units (LU) were measured using a Berthold luminometer and all LU data were obtained from the average of at least two separate experiments.
Detection of neutralization activity for anti-cytokine autoantibodies
To evaluate the neutralizing capacity of anti-cytokine autoantibodies, control PBMCs from individual, healthy blood donors, that were distinct from the 8 controls used for antibody analysis, were incubated in the presence of 10 % healthy control or patient sera and left unstimulated or stimulated with the cytokine recognized by the autoantibodies in that particular patient sample. The PBMC were fixed, permeabilized and stained for an increase in phosphorylation of the specific downstream Signal Transducer and Activator of Transcription (pSTAT) molecules by flow cytometry as described previously . Thus, for patients with anti-IFN-α autoantibodies, cells were stimulated with IFN-α (1000 U/mL) and assessed for IFN-α-induced pSTAT-1 in CD14 + monocytes; those with anti-IFNγ-autoantibodies were stimulated with IFN-γ (1000 U/mL) induced pSTAT-1 in CD14 + monocytes; those with anti-GM-CSF autoantibodies for GM-CSF (10 ng/mL)-induced pSTAT-5 in CD14+ monocytes; those with anti-IL-6 autoantibodies for IL-6 (10 ng/mL) induced pSTAT-3 in CD3+ lymphocytes. Antibodies for flow cytometry were purchased from BD Biosciences. Data were collected using FACSCanto (BD Biosciences) and analyzed using FlowJo Version 9.1 (TreeStar). Using this approach as described [12, 14, 18, 19], the magnitude of pSTAT production due to cytokine stimulation is extremely reproducible and sensitive to incremental changes in the amount of cytokine added and sera was categorized as not neutralizing, partially neutralizing and neutralizing.
GraphPad Prism software (San Diego, CA, USA) was used for analyzing the antibody levels in this study. Geometric mean antibody levels, expressed as mean log (10) LU and 95 % confidence intervals (CI), were calculated and presented as antilog values. The non-parametric Mann–Whitney U statistical test was used for comparison of antibody levels in the control and patient groups. The Fischer exact test was used to evaluate the statistical significance of the prevalence of anti-cytokine autoantibodies in the HZ and PHN subjects.
Anti-cytokine autoantibodies in subjects with HZ and PHN
An initial autoantibody screen of twenty-four potential autoantigens was performed with a pilot set of 33 PHN patients and 8 healthy controls. Seropositivity was observed as follows: 15 % (5/33) for Ro52 and La and 12 % (4/33) for anti Ro60 autoantibodies. Antibody levels for these three autoantigens were often 1000-fold higher than the buffer blanks or other seronegative samples. We also observed that four PHN patients showed unusually high levels of autoantibodies against single cytokines including IFN-γ, GM-CSF and IL-6. Additional weak positive autoantibodies were detected against IFN-ω and AQP-4 in several healthy controls and PHN samples. Autoantibodies against RNP-70, Sm-D3, IFN-λ, TNF-α, TNF-β, IL-17, IL-10, IL-12-p35, IL-12-p40, S100β and GAD-65 were not found in the pilot cohort.
Levels of antibodies against VZV and other herpesviruses in the cohort
Detection of neutralizing anti-cytokine autoantibodies in a few PHN patients
Neutralizing activity of anti-cytokine autoantibodies in HZ and PHN
Ab level (LU)a
Other samplesa (95 % CI)
1388 ± 89 (LU)
1388 ± 89 (LU)
2943 ± 535 (LU)
2943 ± 535 (LU)
2943 ± 535 (LU)
1555 ± 419 (LU)
2079 ± 252 (LU)
2079 ± 252 (LU)
Chronic pain conditions are frequently life-long problems that are difficult to treat, in part, because the underlying factors that contribute to human pain disorders are unclear. For PHN, the mechanisms that contribute to the transition from zoster to PHN remain nebulous. While animal models of PHN have been explored they have many limitations in reproducing the multiple factors encountered in the human disease . Thus, clinical research efforts based directly in human subjects are needed to obtain mechanistic insights into PHN. Based on our earlier work [12, 14, 18, 19], the potential contributions of humoral immune processes to HZ and PHN were investigated with a focus on autoantibodies against cytokines and several known neural and non-neural autoantigens. We further hypothesized that damage to the central or peripheral nervous systems may expose autoantigenic epitopes thereby provoking an autoimmune response . Several reports have appeared examining the presence of autoantigens to peripheral nerve in complex regional pain syndrome [22, 23] and to central nervous system proteins in disorders such multiple sclerosis, although results for some antigens are controversial . In PHN, significant shrinkage in the dorsal horn of the spinal cord has been observed that might be attributable to injury and potential autoimmune attack . Using LIPS, no autoantibodies were detected against two neural antigens, GAD-65 and tyrosine hydroxylase, or two astrocyte antigens S100-β and aquaporin-4 in any of the groups examined. While autoantibodies to four of the six Sjögren’s/systemic lupus erythematosus antigens tested (RNP-A, RNP-70, Sm-D3, and La), were also seronegative, a few patients exhibited elevated autoantibodies against Ro52 and Ro60. These data suggest that PHN, while a painful, stressful sequelae to an infectious disease process, does not induce an autoimmune state to the proteins tested. Previously, the induction of autoantibodies in acute respiratory distress syndrome (ARDS) and septic shock, conditions characterized by severe inflammation and cytokine storm were observed . We hypothesized that the autoantibody induction was due to the ongoing systemic inflammation and associated tissue destruction that may mediate a break in tolerance against these self-proteins. In the ARDS study the levels of autoantibodies were substantially lower than those seen in the anti-cytokine positive patients identified here. This quantitative difference implies that in the PHN patients these anti-cytokine autoantibodies may be pathogenic rather than biomarkers for inflammation. Moreover, the antiviral humoral response against VZV and other HSVs was similar between the HZ and PHN patients. With the LIPS fluid-phase immunoassay used, our data indicate that the humoral response to VZV is intact in most subjects with HZ and PHN.
The novel finding of our study was the presence of sporadic anti-cytokine autoantibodies that were associated with PHN but not with HZ per se. We found six patients with PHN who had high levels (>100,000 LU) of anti-cytokine autoantibodies, but only two patients with HZ and none with CRPS/NP. In neutralization assays, only three subjects had serum antibodies that blocked cytokine signaling, all of whom had PHN. Two additional subjects, one with HZ and one with PHN, had partially neutralizing activities. The anti-IFN-α and anti-GM-CSF autoantibodies observed in two PHN patients may be associated with inflammation, as previously observed in ARDS and septic shock . If the neutralizing levels of autoantibodies against these cytokines were present before or at the time of initial reactivation, then one might expect that they predispose to more severe VZV infection. Consistent with this hypothesis, patients with thymoma have both neutralizing anti-cytokine autoantibodies against IFN-α and a predisposition to both localized and disseminated varicella reactivation, raising the possibility that anti-cytokine autoantibodies might contribute to VZV reactivation in some cases . The potential role of anti-GMCSF autoantibodies in generation of PHN is intriguing. Up until recently, anti-GMCSF autoantibodies were only thought to cause pulmonary alveolar proteinosis . However, in the last several years, anti-GMCSF autoantibodies have been found in patients with cryptococcal meningitis [18, 28] and CNS infections with Nocardia bacteria . In light of the finding of two subjects with VZV reactivation having elevated GMCSF autoantibodies, further investigations of the relationships between GMCSF and VZV infection are warranted.
The one PHN patient with very high levels of anti-IL-6 autoantibodies (i.e., 2,300,000 light units) that were neutralizing is potentially instructive. The presence of IL-6 autoantibodies in the general population, based on sampling of over 300 samples [12, 14] is quite rare. Consistent with a potential role for anti-IL-6 autoantibodies in promoting VZV reactivation, this PHN patient lacked antibodies against VZV, but showed normal humoral responses to EBV. It is possible that impaired IL-6 signaling blunts the inflammatory T-cell reaction and impairs adequate signaling to the relevant plasma cells for anti-VZV antibody production. High levels of anti-IL-6 autoantibodies were also noted in a child who developed an acute VZV infection complicated by multiple cellulitis lesions and subcutaneous Staphylococcus aureus abscesses . Together these two patients implicate IL-6 autoantibodies in the modulation of primary and reactivation VZV infection. IL-6 is secreted by T cells and macrophages to stimulate the immune response and is known to be increased in the serum of HZ . Mechanistically, VZV signals through Toll-like receptor-2-dependent activation of NF-kappa B to induce an efficient inflammatory response . Low levels of IL-6 may lead to impaired anti-VZV immune responses, causing ineffective containment of VZV, more tissue damage and a stronger “peripheral generator” that then drives stronger central sensitization, all of which can contribute to PHN pain. Additional studies in more subjects with PHN are warranted to examine the possibility that IL-6 and other cytokine autoantibodies contribute to PHN.
There are several clinical implications of our findings. First, in sporadic cases, anti-cytokine autoantibodies may potentially contribute to PHN, highlighting the complex interactions between humoral immunity, T-cell immunity and cytokines. Based on the time line for the development of PHN from initial VZV reactivation, screening for anti-cytokine autoantibodies is theoretically possible, yet it is not clear how this might impact the course of treatment. The finding that the IL-6 cytokine might be involved in controlling VZV reactivation and thereby might be useful for early stage treatment of immunocompromised individuals warrants further investigation.
It is likely that the development of PHN is a highly complex, multifactorial process driven by many subtle genetic, environmental and acquired factors. Based on the present observations, one such acquired factor is the presence of anti-cytokine autoantibodies, which could act as potential drivers of PHN by creating deficits in immune signaling. While the frequency of PHN patients harboring anti-cytokine autoantibodies found in our study was small, it is important to point out that PHN is quite common in adults over 60 and these findings would translate into explaining potentially many cases per year. Since autoantibodies and decline in immune system function are known to occur more commonly in older subjects [32–34], the present observations suggest the likelihood that there may be additional, unrecognized pathogenic autoantibodies against other immune components in older subjects that may increase susceptibility to PHN.
PDB, AJM, JIC and MJI were involved in study design. AB and PDB were involved in LIPS testing, data analysis, and manuscript drafting and editing. AB and JK collected and provided the CRPS/NP cohort. SKB, BM and SMH were involved in the neutralization experiments. MQ and JB provided HZ and PHN patient samples and clinical data. All authors read and approved final manuscript.
This work was supported by the intramural research programs of the National Institutes of Health Clinical Center, National Institute of Dental and Craniofacial Research, the National Institute of Allergy and Infectious Diseases, and the VZV Research Foundation. JB receives funding from the UK National Institutes for Health Research UCL/UCLH Biomedical Research Centre. The authors declare no financial interests that may represent a competing interest.
The authors declare that they have no competing interests.
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