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Spectrum of centrosome autoantibodies in childhood varicella and post-varicella acute cerebellar ataxia

BMC Pediatrics volume 3, Article number: 11 (2003) Cite this article

Abstract

Background

Sera from children with post-varicella infections have autoantibodies that react with centrosomes in brain and tissue culture cells. We investigated the sera of children with infections and post-varicella ataxia and related conditions for reactivity to five recombinant centrosome proteins: γγ-enolase, pericentrin, ninein, PCM-1, and Mob1.

Methods

Sera from 12 patients with acute post-varicella ataxia, 1 with post-Epstein Barr virus (EBV) ataxia, 5 with uncomplicated varicella infections, and other conditions were tested for reactivity to cryopreserved cerebellum tissue and recombinant centrosome proteins. The distribution of pericentrin in the cerebellum was studied by indirect immunofluorescence (IIF) using rabbit antibodies to the recombinant protein. Antibodies to phospholipids (APL) were detected by ELISA.

Results

Eleven of 12 children with post-varicella ataxia, 4/5 children with uncomplicated varicella infections, 1/1 with post-EBV ataxia, 2/2 with ADEM, 1/2 with neuroblastoma and ataxia, and 2/2 with cerebellitis had antibodies directed against 1 or more recombinant centrosome antigens. Antibodies to pericentrin were seen in 5/12 children with post-varicella ataxia but not in any of the other sera tested. IIF demonstrated that pericentrin is located in axons and centrosomes of cerebellar cells. APL were detected in 75% of the sera from children with post-varicella ataxia and 50% of children with varicella without ataxia and in none of the controls.

Conclusion

This is the first study to show the antigen specificity of anti-centrosome antibodies in children with varicella. Our data suggest that children with post-varicella ataxia have unique autoantibody reactivity to pericentrin.

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Background

There are 3 million cases of chicken pox each year in the United States and 90% of this infection occurs in children 1–14 years of age [1]. The sequelae of varicella infection in children includes a number of severe complications such as purpura fulminans and thromboembolism [2, 3]. In these conditions, autoantibodies to a variety of phospholipids and protein related to coagulation were reported and the related syndrome was referred to as The Varicella-Autoantibody Syndrome [3]. Encephalitis is another of sequelae of varicella in children that accounts for 20% of hospital admissions due to varicella [4]. A cerebellar syndrome associated with post-infectious and post-vaccinial states that usually begins abruptly 5 to 6 days following the subsidence of a rash, is manifest primarily as ataxia. This syndrome is common following varicella but also appears in measles, rubella and Epstein Barr virus (EBV) infections [1, 5–7]. The course is usually mild and most children recover, but it can progress in some children to more severe disease as manifested by vomiting, dehydration and drowsiness. Although central nervous system complications usually develop within a week after eruption, they may be delayed for up to 21 days.

The pathogenesis of post-varicella cerebellar ataxia is unknown. A number of autoantibodies have been described in other post-viral conditions, including antineuronal antibodies in a case of post-infectious cerebellar ataxia following EBV infection [6], antibodies to Purkinje cells in children with opsoclonus myoclonus associated with neuroblastoma or a prodromal viral illness [5], and antibodies to centrioles in 2 children with ataxia and other central nervous system manifestations following Mycoplasma pneumoniae infection [8]. In a recent study of children with post-varicella ataxia, we found antibodies to cerebral and cerebellar tissue [9].

A family of proteins located at the centrosome that react with human autoantibodies include pericentrin, ninein, enolase, PCM 1 and a newer autoantigen, Mob1 [10, 11]. These components are part of the pericentriolar material (PCM) that surrounds the centrioles and mediates functions such as microtubule organization and recruitment of proteins to the centrosome. Pericentrin in particular has been shown to be an important structural protein within the PCM [12] and exist as particles in the cytoskeleton. These particles transit to the centrosome via the motor protein dynein [12].

Antibodies directed against centrosomes have been described in a number of conditions including arthritis, Raynaud's phenomenon and systemic sclerosis [11, 13–18]. In addition, 'naturally' occurring antibodies to centrosomes have been described in laboratory rabbits [19]. The specific antigenic target of many of these autoantibodies remains undefined but with the identification of centrosome components and the availability of the cDNAs and respective recombinant proteins, systematic studies of autoantibody specificity can now be determined with more precision.

Most children with post-infectious ataxia have a mild course but some are more severely affected. If the mechanisms that lead to the development of post-infectious cerebellar ataxia are more completely understood, then a rational approach to treatment could be considered. We investigated the possibility that autoantibodies to specific centrosome proteins are associated with a subset of children with post-varicella acute cerebellar ataxia.

Methods

Patients & Sera

Children with chicken pox and subsequent cerebellar ataxia were included in this study [8, 9, 9]. Blood samples were obtained at the first visit and, in all but 4 patients, at a convalescent stage 2 weeks later. We also obtained acute blood samples from 5 siblings of those with post-varicella ataxia with chicken-pox but without ataxia, from 20 normal controls, 20 children with juvenile chronic arthritis, 1 child with post-EBV ataxia, 2 with acute disseminated encephalomyelitis (ADEM), and 1 with neuroblastoma and ataxia, and 1 with cerebellitis. Varicella serology to confirm the clinical diagnosis included an ELISA for IgG antibodies at onset and complement fixation titer at onset and at 2 weeks. Other control sera were from ongoing serological studies in the advanced Diagnostics Laboratory at the University of Calgary. All sera were stored at -20°C.

Indirect immunofluorescence (IIF)

Conventional IF was performed on commercially available HEp-2 cells (Immuno Concepts Inc., Sacramento, CA) and formalin-fixed HeLa cells using a fluorescein-conjugated goat anti-human IgG (light and heavy chain) as previously described [20]. Reactivity of patients' sera was also tested on cryopreserved sections of monkey cerebellum (Medica, Carlsbad, CA) by IIF. Rabbit antibodies to pericentrin (a gift from Dr. D.A. Compton, Dartmouth Medical School, Hanover, NH) and human antibodies to the Yo antigen [21] were used in co-localization experiments. In some experiments, DNA was stained with DAPI to allow for co-localization with centrosome staining. Slides were viewed on a Leitz or a Zeiss Universal microscope fitted with a TEC470 CCD video camera system (Optronics Engineering, Goleta, CA) and images were processed with a Sony Color Video Printer and recorded on Sony Type 1010 photography paper.

Immunoblotting recombinant centrosome proteins

Recombinant proteins were prepared from full-length cDNAs representing five different centrosome autoantigens using previously published protocols [11, 22, 23]. Briefly, cDNA inserts were amplified using standard polymerase chain reaction protocols, and subcloned in the Eco RI site of the expression vector pGEX-5X (Pharmacia Biotechnology, Uppsala, Sweden). Expression of recombinant protein fused to a 28 kDa glutathione S transferase (GST) leader sequence was induced with 0.1 mM IPTG. Bacteria were lysed by sonication, and insoluble material was removed by centrifugation. GST fusion proteins were purified directly from the bacterial lysates using the affinity matrix glutathione Sepharose 4B. After binding and washing, the fusion proteins were eluted under mild non-denaturing conditions using 10 mM reduced glutathione in 50 mM Tris HC1 (pH 8.0).

Bacterial lysates that expressed the recombinant proteins were resuspended in sodium dodecyl sulfate sample buffer and denatured by boiling for 5 minutes as previously described [23]. The proteins were separated on a 10% SIDS-polyacrylamide gel, transferred to nitrocellulose membranes (Bio-Rad, Hercules, CA), and incubated with a 1:1000 dilution of the appropriate serum. The recombinant proteins were produced from the SM-3 fragment for human ninein, a clone representing base pairs 45–1778 of pericentrin, a cDNA representing PCM-1 and designated 17A1 [24], two partial cDNAs (SM-1, SM-16) for Cep250, and ninein. Secondary antibodies were polyvalent horse radish peroxidase-conjugated goat anti-human IgG, anti-mouse (IgG) or anti-rabbit IgG, IgA, and IgM (Zymed, San Francisco, CA). Immunoreactive bands were visualized using the ECL Western blotting system (Amersham International, Princeton, NJ) [11].

Phospholipid ELISA

An anti-Phospholipid-8Pro-G EIA Kit (Alpco Diagnostics, Windham, NH) was used to test for the presence of antibodies against phospholipids: β2-glycoprotein I, β2-glycoprotein I combined with cardiolipin in the same well (β2-GP1 + CL), CL alone, phosphatidyl choline, phosphatidyl ethanolamine, phosphatidyl inositol, phosphatidyl serine, and sphingomyelin. Briefly, the serum samples were diluted to 1:101 and then incubated with the specific antigen in microtiter wells. The unbound antibodies were washed away as per the manufacturer's instructions. An anti-human immunoglobulin (IgG,A,M) secondary antibody conjugated to horseradish peroxidase was added and incubated for 15 minutes at room temperature. Unbound conjugate was washed off and the addition of TMB-substrate generated an enzymatic colormetric reaction, which was stopped by adding diluted acid. The reactivities were read at an absorbance of 450 nm on a Biomek 1000 (Beckman) and cutoffs based on graded control positive and negative control sera provided with the kit.

Results and discussion

Eleven of 12 sera from children with post-varicella ataxia had IgG antibodies that reacted with the centrosome of formalin-fixed HeLa cells in an IIF assay (Figure 1). We observed that commercially prepared substrates, such as HEp-2 cells, were not sensitive for the detection of centrosome autoantibodies but that the formalin-fixed HeLa cells are a more reliable and sensitive substrate. When the sera were tested for IgG antibodies by immunoblotting (Figure 2), 10/12 reacted with at least one of the five centrosome proteins: ninein, PCM 1, γγ-enolase, Mob-1, or pericentrin (Table 1). Thus, one serum had autoantibodies to a centrosome antigen that was not included in the proteins listed above. Specifically, 5/12 (42%) reacted with pericentrin (Figure 2), 3/12 (25%) with ninein, 6/12 (50%) with PCM 1, 3/12 (25%) with Mob-1, and 3/11 (27%) with γγ-enolase. By comparison, 3/5 siblings with varicella infections but no ataxia, 1/1 with post-EBV ataxia, 2/2 with ADEM, 1/2 with neuroblastoma and ataxia, and 2/2 with cerebellitis had antibodies directed against at least one of the centrosome proteins. None of the 12 sera from other disease groups, including 20 children with juvenile chronic arthritis, or 20 normal controls reacted with pericentrin, although they did react with other recombinant centrosome proteins. When convalescent sera were tested, the frequency of anti-centrosome antibodies as detected by IIF and anti-pericentrin as detected by immunoblotting decreased to 4/12 (33%) of children with post-varicella ataxia, and none of the other children sustained detectable reactivity at two weeks follow-up. The number of sera from children with ataxia that was not associated with varicella is admittedly small and validation of our data would require multi-center studies or access to large neurological or infectious diseases serum banks.

Figure 1
figure 1

Autoantibodies to centrosomes Indirect immunofluorescence illustrating antibodies to centrosomes as seen in sera of children with post-varicella ataxia on formalin fixed HeLa cell substrate. The cells are counterstained with DAPI to identify the nucleus (a) and the pattern of staining and localization of centrosomes (arrows) is shown in panel b. Original magnification ×400.

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Figure 2
figure 2

Immunoblot of purified recombinant pericentrin Immunoblot of recombinant GST-pericentrin with sera from children with post-varicella ataxia (lanes c-j), an adult with idiopathic ataxia (lane k), and sera from a patient with scleroderma and anti-centrosome antibodies (lanes l). Controls included rabbit antibodies directed to recombinant pericentrin (lane a), murine antibodies to GST (lane b), and the index human anti-centrosome serum (lane m).

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Table 1 Reactivity of sera from ataxia patients with centrosome proteins
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The demographics, clinical profile and outcome of our patients with post-varicella ataxia has been reported elsewhere [9]. We are aware of only one report of virus or viral antigen identification in varicella-associated cerebellar ataxia [25]. A number of autoantibodies have been reported in other post-infectious cerebellar syndromes. Ito and his colleagues reported IgG and IgM anti-neuronal antibodies that reacted with both nuclear and cytoplasmic elements of Purkinje cells in acute cerebellar ataxia following infection [6]. In this study, the IgM reactivity gradually decreased and the ataxia gradually improved. Sera from 9 children with opsoclonus-myoclonus syndrome (3 associated with neuroblastoma and six with a prodromal illness) had IgM and IgG binding to the cytoplasm of cerebellar Purkinje cells and to some axons in white matter. Western blot analysis showed a distinctive pattern of binding to several neural proteins, including a 210 kDa antigen identified as the high molecular weight subunit of neurofilament [7]. Last, two children with central nervous system manifestations (including ataxia) following Mycoplasma pneumoniae infection were reported to develop anti-centriole antibodies [8].

Autoantibodies to centrosomes have also been associated with systemic sclerosis and other conditions [10, 11, 26–28]. These observations suggest that autoantibodies to centrosomes as detected by IIF are not disease specific. Studies of specific antibodies directed against pericentrin showed that they are found in 27% of systemic sclerosis sera [17]. Although ataxia or central nervous system involvement is unusual in systemic sclerosis, these patients, as well as patients with an autoimmune paraneoplastic syndrome are known to have autonomic nervous system dysfunction that is associated with antibodies directed against antigens in the myenteric complex [29–31].

Since unique reactivity with pericentrin was noted, we proceeded to determine the distribution of pericentrin in cerebellum tissue by IIF. We observed that pericentrin is expressed in cerebellum as evidenced by intense staining of centrosomes and less intense staining of neuronal axons (Figures 3,4). Cells stained by human sera and rabbit antibodies to pericentrin were found throughout the cerebellum including those in the nuclear and granular layers. This observation is consistent with evidence that, in addition to it being a component of centrosomes, pericentrin exists as particles in the cytoplasm [12]. We observed that some cells, particularly certain Purkinje cells, contain numerous particles and more than one centrosome (Figure 3) and strong reactivity was also found in adjacent cells that were consistent with the location and appearance of Bergman glial cells (Figure 4). These observations are consistent with earlier observations that Purkinje cells are polyploidy [32, 33]. The observation that children with ataxia produce antibodies to centrosome proteins, including pericentrin, and that Purkinje cells are polyploid raises the question of the vulnerability of these cells to autoimmune attack. Although we have no direct evidence to substantiate this hypothesis, in paraneoplastic cerebellar degeneration where ataxia is a dominant clinical feature, anti-Purkinje cell antibodies (APCA or anti-Yo) are believed to be responsible for the Purkinje cell loss that accompanies the disease [34, 35]. This is supported by observations that removal of the autoantibodies from the circulation of a paraneoplastic cerebellar degeneration patient provided improvement of cerebellar signs [36].

Figure 3
figure 3

Indirect immunofluorescence of cryopreserved monkey cerebellum Sections of cryopreserved monkey cerebellum were reacted with human serum from a child with anti-centrosome antibodies and anti-pericentrin that was combined with low titer anti-Yo antibodies to visualize Purkinje cells. This shows that autoantibody reactivity is prominent in cells in the nuclear layer (left half of micrograph) and Purkinje cells (P, arrows) in the cerebellum and to a lesser extent in cells in the molecular layer (right half). Numerous discrete cytoplasmic speckles are seen in the Purkinje cells as illustrated in the enlarged cell (a, lower right inset). The nuclei of cells stained with DAPI (blue) is shown in panel b and this was overlayed on the IIF image from panel (a).

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Figure 4
figure 4

Reactivity of rabbit antibodies to pericentrim on monkey cerebellum Indirect immunofluorescence of monkey cerebellum stained with rabbit antibodies to pericentrin (b,d). Cells believed to be Bergman glial cells (a,b) and an adjacent Purkinje cell (c,d) show intense staining of centrosomes. The nuclei of the reactive cells are counterstained with DAPI (a,c). Axonal staining by anti-pericentrin is observed as strands (b,d).

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Of potential relevance to varicella-related ataxia, it was observed that newly assembled viruses disrupt microtubule organization, as well as centrosome duplication and function [37, 38]. This provides insight into mechanisms by which varicella infection might lead to altered proteins and neural function, and the subsequent production of autoantibodies. Obviously, additional studies to delineate differential expression of pericentrin and its interaction with viral components in various cells and tissues are required to substantiate this idea. Of interest, recent evidence suggests that the centrosome may be an important locus for MHC class I antigen processing and that targeting antigens to the centrosome enhances the immune response [39].

A recent study [3] reported the presence of anti-phospholipid (APL) antibodies in children with acute varicella infections. In this study we found 75% of the children with post-varicella ataxia, 50% of children with varicella but no ataxia, and none of the children with post-EBV ataxia or cerebellitis had elevated APL as detected by ELISA. All positive sera reacted with β2-GP1 + CL, three reacted with CL alone, and individual sera reacted with phosphatidyl inositol (post-varicella ataxia), phosphatidyl serine (varicella without ataxia) and sphingomyelin (varicella without ataxia). These results confirmed that children with varicella infections have a high frequency of antibodies to phospholipids. In the previous study these antibodies were found to be transiently associated with infection and were not predictive of thrombotic complications [3]. In the clinical setting of assessing the risk of thrombosis, a functional clotting assay may have more clinical relevance. In our study the most common APL was bound β2-GP1 + CL. However, these antibodies or other the other PL antibodies showed no correlation with ataxia. The specificity of APL for varicella infections was indicated by the observation that patients with cerebellitis and post-EBV ataxia did not have APL.

Conclusions

This is the first report to document that children with post-varicella ataxia develop autoantibodies to a variety of centrosome components. The reactivity of sera from children with post-infectious varicella ataxia appears to be unique in that they react with pericentrin. The origin of centrosome autoantibodies as a sequelae of varicella infection and the potential pathogenic role of antibodies to pericentrin awaits further study.

Abbreviations

ADEM:

acute disseminated encephalomyelitis: APCA, anti-Purkinje cell antibodies

APL:

anti-phospholipid antibodies

CL:

cardiolipin

EBV:

Epstein Barr Virus

GST:

glutathione S transferase, IIF, indirect immunofluorescence

JCA:

juvenile chronic arthritis

PL:

phospholipid

PCM:

pericentriolar material.

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Acknowledgements

The authors acknowledge that Dr. Coleen Adams collected the sera and provided clinical information. This research was supported by the Canadian Institutes of Health Research (Grant # MOP 38034) and a grant from the Natural Sciences and Environment Research Council to JBR.

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Authors and Affiliations

  1. Department of Medicine, Faculty of Medicine University of Calgary, 3330 Hospital Dr. NW, Calgary, AB T2N 4N1, Canada

    Marvin J Fritzler & Laura M Stinton

  2. Department of Cell Biology & Anatomy, Faculty of Medicine University of Calgary, 3330 Hospital Dr. NW, Calgary, AB T2N 4N1, Canada

    Meifeng Zhang & Jerome B Rattner

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  1. Marvin J Fritzler
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Correspondence to Marvin J Fritzler.

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Authors' contributions

MJF coordinated the clinical and research studies, provided two of the figures and was the primary author of the manuscript; CA collected the sera, provided the clinical information and edited the manuscript; MZ, conducted all the recombinant protein studies and centrosome immunoassays: LMS, performed all the phospholipid antibody studies and their interpretation; JBR, coordinated the production of centrosome antigens and the immunoblotting studies, provided two of the figures and was an author of the of the manuscript.

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Fritzler, M.J., Zhang, M., Stinton, L.M. et al. Spectrum of centrosome autoantibodies in childhood varicella and post-varicella acute cerebellar ataxia. BMC Pediatr 3, 11 (2003). https://doi.org/10.1186/1471-2431-3-11

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Keywords

  • Purkinje Cell
  • Cerebellar Ataxia
  • Phosphatidyl Choline
  • Juvenile Chronic Arthritis
  • Acute Disseminate Encephalomyelitis

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