Diversity in autoimmunity against retinal, neuronal, and axonal antigens in acquired neuro-retinopathy
© The Author(s) 2011
Received: 10 May 2011
Accepted: 24 June 2011
Published: 10 July 2011
Autoimmune retinopathies and optic neuropathies are complex disorders of the retina and the optic nerve, in which patients develop autoantibodies (AAbs) against retinal and optic nerve proteins. Autoimmunity might significantly influence the outcome of retinal and optic nerve degenerative process but the pathogenic process is not fully elucidated. To better understand the role of AAbs in pathogenicity of these suspected autoimmune visual disorders, we focused on unique AAbs specificities associated with the syndrome to identify their antigenic targets in the optic nerve and retina.
Serum samples were obtained from patients, whose visual disorders were potentially autoimmune in nature, including patients with cancer with possible paraneoplastic syndrome. Autoantibodies were tested against human optic nerve and retinal antigens for specificity by Western blotting and immunofluorescence.
Out of 209 tested for anti-optic nerve autoantibodies, 55% showed specific neuronal autoantibodies. The repertoire of anti-optic nerve autoantibodies often differed from anti-retinal antibodies. The major antigenic targets for these antibodies could be divided into four groups. Autoantibodies specific to classical glycolytic enzymes involved in energy production (α and γ enolases, glyceraldehyde 3-phosphate dehydrogenase) also reacted with retinal antigens. Autoantibodies targeted neuronal-specific myelin proteins (MBP, MOG), aquaporin 4, and collapsing response mediator protein 5 reacted with optic nerve antigens. They showed immunostaining of axons and myelin in the optic nerve as determined by double immunofluorescence.
We identified novel neuronal autoantigens not previously known to be associated with acquired autoimmune retinopathy and optic neuropathy. Knowledge of the full autoantibody repertoire perpetuating this syndrome is an important first requirement in increasing our understanding of the autoimmune process to facilitate better diagnosis, prognosis, and treatment.
Presence of autoantibodies (AAbs) specific against antigens present in the retina is the hallmark of autoimmune process in cancer-associated retinopathy (CAR) and autoimmune retinopathy (AR) [1, 2]. Patients diagnosed with paraneoplastic or non-paraneoplastic retinopathy often present with optic nerve problems not related to glaucoma. Serum antibodies against neuronal antigens have been detected in a wide variety of neurological disorders but anti-optic nerve AAbs has not been extensively studied. Autoimmune retinopathies and optic neuropathies are complex disorders of the retina and the optic nerve, in which patients develop AAbs against retinal and optic nerve proteins . Dependent on whether the syndrome is targeting the retina, optic nerve, or both, the pathogenesis of these syndromes are poorly elucidated and may be characterized by progressive loss of visual acuity and/or visual field sensitivity, loss photoreceptors and/or retinal ganglion cells (RGCs) and their axons, and optic nerve head changes, such as pallor, hyperemia, edema, swelling, or dropout of the retinal nerve fiber layer (RNFL) by optic coherence tomography (OCT) imaging [4–8].
Thus far, most studies have focused on AAbs in glaucoma and neuronal loss due to the loss of RGCs [9, 10]. The perceived pathology of autoimmune optic neuropathy and glaucoma is different, although both might have a similar underlying autoimmune cause [6, 11]. It is important to point out that the immune response might significantly influence the outcome of retinal and optic nerve degenerative process. For example, AAbs can exert their pathogenic effects if they gain access from the periphery to the central nervous system (CNS)/eye when the integrity of the blood barriers is compromised. Because there is little known about pathogenicity of retinopathy and associated optic neuropathy, we undertook a first line of investigation focusing on unique AAbs specificities associated with the syndrome that is thought to be autoimmune in nature, including patients with cancer with potential paraneoplastic syndrome. These patients had symptoms of optic nerve and/or retinal dysfunction, some of which have been found to have electrophysiological evidence of retinal process, or other findings to suggest an optic nerve process. However, work-up did not reveal a definite known disorder. In this patient population, we found autoantibodies that target antigens present in the optic nerve and retina, may affect the outcome of the visual dysfunction. The identity of antigenic targets that those AAbs recognize in the optic nerve will allow for a better understanding of the molecular mechanism of RNFL and axonal loss during optic neuropathies. Our study shows that these patients have unique AAbs against neuronal antigens often different from the retinal antigens.
Materials and methods
Patient's sera were acquired through the Ocular Immunology Laboratory through retrospective serological evaluation for anti-retinal autoantibodies. The study has been approved by the OHSU Institutional Review Board.
Human retinal proteins were extracted from the retina or optic nerve with 2% octyl glucoside in phosphate buffer, pH 7.2 and 10-μg protein was used for electrophoresis using Bio-Rad Criterion gels following by transfer to PVDF membrane . As positive controls, we used monoclonal antibodies against α-enolase and γ-enolase diluted 1:2,000. A negative control contained secondary antibodies only. The reactivity with a suspected known protein was confirmed by an additional Western blotting using an appropriate purified protein. Also, we used brain extract prepared by the same method as was used to extract retinal proteins to confirm reactivity with neuronal antigens.
Rat eye posterior globe containing the whole retina and optic nerve was fixed in 4% paraformaldehyde for 1 h followed by 30% sucrose infiltration overnight and the globe was frozen in Tissue-Tek optimal cutting temperature compound. Ten-micron cryosections were prepared for incubation with human serum. Briefly, sections were blocked with 10% normal goat serum with 1% bovine serum albumin for 60 min followed by incubation with patient's serum overnight. After washing, fluorescent anti-human IgG labeled with FITC or biotin-labeled anti-human IgG followed by Texas Red labeled to streptavidin were added for 1 h. The mounting reagent, which inhibited fluorescence quenching and contained DAPI for nuclear staining was used to seal the sections. The labeling was evaluated in a Leica DM5000 fluorescent microscope and pseudocolor images were acquired for analysis. A negative control contained secondary antibodies only.
For double staining we used biotinylated anti-human IgG followed by Streptavidin conjugated to Texas Red or antibodies specific to cell markers at 1:100 dilutions: neuronal fibers (RT97) (Chemicon), glial fibrillary acidic protein (GFAP) (BD Pharmingen) for astrocytes and cyclic nucleotide phosphodiesterase (CNPase) (Thermo Scientific) and myelin oligodendrocyte glycoprotein (MOG) (Abnova) for oligodendrocytes followed by the appropriated secondary antibodies conjugated to Alexa Fluor 488. After incubation with antibodies, tissue sections were washed and mounted with DAPI. The acquired images were merged using Photoshop software to show specific cellular labeling.
General characteristics of patients
Paraneoplastic neuro-retinopathy patients with anti-optic nerve and anti-retinal AAbs
Onset of cancer
Onset of visual symptoms
Reported optic nerve findings
Anti-optic nerve AAbs
Brain venous angioma
Apparent temporal pallor
27 k, 35 k
Bilateral temporal optic disc pallor and juxtapapillary atrophic changes OD > OS
24 k,36 k, 50 k, 70 k
46 k, 62 k, 70 k, 112 k
46 k, 82 k
46, 66 k, 82 k
Sequential episodes of optic neuropathies
30, 42 k low
23 k, 27 k
23 k, 25 k, 32 k, 33 k
35 k,38 k low
Breast metastatic to brain
Congenital optic nerve change with tilting OS,
30 k, 36 k
Slightly enlarged cup to disc ratio bilaterally
36 k, 42 k, 96 k
40 k, 44 k, 46 k, 60 k
46 k high
Homonymous hemianopsia OD, hemi between the macula and optic nerve
35 k low
35 k low
7 proteins 35–50 k
28 k, 46 k
Lung non-small cell carcinoma
Holes in both capsules
47 k, 70 k, 112 k
46 k, 45 k
35 k, 46 k
RNFL slightly thinned temporally OD;
61 k, 62 k
30 k, 67 k, 112 k
Prostate and adrenal adenoma
Prostate and skin cancers
Very enlarged blind spots OU
30 k, 46 k, 90 k, 140 k
Vertical optic nerve head cupping OS > OD, in OS with peripapillary atrophy
49–50 k, 90 k
36 k, 54 k
27 k, 30 k, 33 k
Since the presence of AAbs against optic nerve antigens has not been previously tested in healthy individuals, we also analyzed 56 normal sera (32 females of average age 47 years and 24 males of average age 45 years) for anti-optic nerve AAbs by Western blotting. The vast majority of normal sera, showed no or low reactivity with optic nerve proteins. Only four out of 56 sera (7%) weekly reacted with optic nerve proteins (35, 46, 62 kDa) as determined by Western blotting (not shown).
Anti-optic nerve autoantibodies
Astrocytic and neuronal immunoreactivity in the optic nerve
To further confirm the immunoreactivity with optic nerve proteins and to identify cellular targets for these seropositive AAbs in relation to autoimmune optic neuropathy, we carried out a series of double-immunofluorescent labeling studies using rat optic nerve thin cryosections. The patients' sera were co-incubated with specific antibodies against astrocytes (GAFP), neuronal fibers (RT97), and oligodendrocytes (CNPase and MOG), aquaporin 4 (AQP4), NSE, and CRMP-5 in double-staining experiments. No oligodendrocyte-specific labeling was detected in the retina (not shown). GFAP immunolabeled the RGC layer and RT-97 labeled the neuronal axons of the normal rat retina. All those antigens were present in the optic nerve. No staining was observed with control sera whereas groups of seropositive sera showed similar labeling patterns.
Autoimmunity to retinal, neuronal, and axonal antigens may play a role in inducing cellular degeneration. The specific AAbs against retinal antigens are most commonly associated with CAR and AR but their pathogenic effects were not fully established . The current studies showed that serum anti-optic nerve AAbs are also present in more than 50% patients tested in patients with either CAR or AR. The major optic nerve antigenic targets for patients AAbs described in these studies can be divided into four categories as follows: (1) classical glycolytic enzymes involved in energy production, including α and γ enolases, glyceraldehyde 3-phosphate dehydrogenase, which also reacted with retinal antigens; (2) neuronal-specific myelin proteins; (3) CRMP5; (4) AQP4. Also other antibodies were present but their antigens have not yet been discovered and are under investigation. The newly identified AAbs labeled optic nerve components such as axons, astrocytes, and oligodendrocytes. Although their role in the pathogenicity of the optic neuropathy affecting these patients needs to be evaluated further, we believe that these unique anti-optic nerve AAbs can be valuable disease markers. We observed that the AAb presence correlated with various clinical (ophthalmoscopic changes at or around the disc), imaging (thinning or, in fact, swollen RNFL), and functional findings presented by affected patients, not usually seen in retinopathies. Moreover, distinct autoantigens may become novel therapeutic targets in disease, e.g., blocking GAPDH-mediated cell death in pathological conditions. Therefore, the identity of cellular targets is important in better understanding the etiology of autoimmune retinopathy associated with optic neuropathies, whether with or without retinopathy, and for developing better treatments. Our research was solely intended to identity of anti-optic nerve AAbs targets because this area was not explored before. The future studies will evaluate their responsiveness to immunosuppressive treatments for neuro-retinopathy targeting reducing the antibody titers on follow-up testing and clinical response to therapy.
The definition of the autoimmune neuro-retinopathy is not well defined. Autoimmune optic neuropathy (AON) was first described by Dutton et al. as recurrent episodes of optic neuropathy with AAbs but as a different entity distinct from demyelinating optic neuritis . In general, AON has been characterized by chronically progressive or recurrent visual loss associated with serological evidence of autoimmunity and without a defined systemic autoimmune disorder . Later, autoimmune-related retinopathy and optic neuropathy (ARRON) has been defined by the Keltner’s group as a syndrome that is characterized by visual loss and often the presence of antibodies against retinal or optic nerve antigens in the absence of cancer . Our patients suffer from retinopathy and optic neuropathy, more than half had both anti-retinal and anti-optic nerve autoantibodies, and third of them has been diagnosed with cancer at the time of testing for antibodies. We recommend the following unique measurements that help improve the diagnosis for optic neuropathy in the context of retinopathy: delay VEPs, pattern of visual fields loss that is not clearly consistent with retinopathy, attenuated and/or thickened RNFL as measured by OCT imaging criteria, compromised photopic negative response (PhNR) of the photopic flash ERG, which is mediated by RGCs, and the presence of AAbs, some of which may label RGCs in the tissue. Our research identified new AAbs specific against optic nerve antigens not previously known in autoimmune neuropathy associated with retinopathy, suggesting the autoimmune nature of the syndrome also at the optic nerve level. If pathogenic, AAbs binding to proteins in optic nerve neurons may lead to disruption of protein function, apoptosis of cells, as well as inhibiting enzymes that preserve neuronal glycolytic activity and neuronal integrity.
A high prevalence of various AAbs in patients with neuro-retinopathy suggests a polyclonal activation of the humoral immune system. It is not clear what the role of each AAb is in autoimmune optic neuropathy and whether the AAbs contribute to pathogenicity at all. We hypothesize that autoimmune damage to the retina and optic nerve may be caused directly by the AAbs, or indirectly by a non-immune cause that contributes to tissues damage but may activate the secondary immune responses as a result of neuronal degeneration. During pathogenic processes, AAbs could bind to neuronal proteins in optic nerve and retina, inhibiting enzymes that preserve neuronal glycolytic activity and neuronal integrity, which may ultimately lead to apoptosis of those cells . Thus, AAbs may be directly involved in the induction of pathogenic processes or could be related to the progression over time of ongoing pathological processes in the retina and optic nerve. In the latter, specific AAbs related to specific phenotype could be considered as biomarkers related to disease. We identified AAbs that belong to the group of neuronal glycolytic enzymes such as GAPDH (glyceraldehyde 3-phosphate dehydrogenase)  and neuronal-specific and non-neuronal enolases . These are multifunctional proteins that are all expressed intracellularly but also on the neuronal cell surface [20, 21]. They are involved in energy metabolism, cell signaling, and synaptic neurotransmission . Although these AAbs can be present in normal controls, they were present significantly more frequently in the sera of retinopathy patients . The biological significance of anti-GADPH must be related to the roles of GADPH as a multifunctional enzyme that is involved in apoptosis, oxidative stress, activation of transcription, membrane fusion, and vesicle transport. GADPH is a cytosolic protein but can translocate to the nucleus in apoptotic processes. Interestingly, GADPH is present in large quantities in rod outer segments playing a role in the production of energy for these active cells . Therefore, neuronal death induced during glycolysis inhibition involves calcium influx through NMDA receptors and calcium release from intracellular ER stores [17, 24]. Uncontrolled increases in intracellular calcium lets to apoptotic cell death. It has been suggested that GADPH plays a pathogenic role in human age-related neurodegenerative diseases, including Huntington's disease, Parkinson's disease, and Alzheimer's disease . Neuronal damage related to aging and chronic neurodegenerative diseases has been suggested to be associated with decreased glucose metabolism due to AAb action [24, 26]. Such possibility exists because GADPH is a strong antigenic protein, especially during infections, which leads to elucidation of anti-GADPH AAbs  and similarity in the amino acid sequence of Streptococcal and human proteins explains a cross-reactive immune response against this protein . Likewise, enolase and aldolase are also expressed on Streptococcal pyogenes and they too show significant identity between Streptococcal and human neuronal glycolytic enzymes (apart from aldolase C) .
Only a few of our patients have AAbs targeting the astrocytic water channel protein, AQP4. Anti-AQP4 AAbs has been found in a high percentage (~75%) of neuromyelitis optica patients (NMO-IgG), usually identified by immunofluorescence only , suggesting the importance of conformational epitopes, but also linear epitopes were later recognized in denatured protein . The recognition of linear epitopes could explain the immunoreactivity discordances observed for some serum samples, which tested positive by immunocytochemistry but were negative by WB, and vice versa. NMO is a rare inflammatory demyelinating disease that selectively affects optic nerves and spinal cord, usually not seen in multiple sclerosis (MS) and other demyelinating syndromes of the CNS . AAbs against AQP4, which is expressed in astrocytic endfeet at the blood brain barrier, are believed to induce damage to astrocytes . The close contact of AAbs/AQP4 positive processes with oligodendrocytes and myelin tracts suggest that a bystander effect of AAbs-damaged astrocytes on oligodendrocytes might occur in the nervous tissues affected by autoimmune optic neuropathy.
Optic neuritis associated with anti-AQP4-Ab affected only females who had bilateral eye involvement, and all had severe visual impairment in the acute phase and delayed partial visual recovery . Our patients with serum anti-AQP4 were male. Similar to our patients, NMO patients showed a predominant positive anti-MOG response and anti-MBP AAbs. There are some clinical features that overlap between autoimmune optic neuropathy and NMO . Despite the limited number of samples, presence of such AAbs suggests a predominantly widespread acute immune activation, including a strong B-cell response . However, the role of anti-AQP4 AAbs in neuro-retinopathy is not clear.
AAbs against CRMP5 were reported in paraneoplastic syndrome patients with optic neuropathy and retinopathy associated with the presence of vitreous and intrathecal cells . The neurological syndromes associated with CRMP5 antibodies are very diverse (much like those associated with anti-Hu antibodies) and include peripheral neuropathy, limbic encephalitis, ataxia, as well as paraneoplastic chorea or optic neuritis . Because anti-CRMP5 AAbs were found in almost 80% seropositive patients with lung cancer, CRMP5 has become an established biomarker for lung cancer-related paraneoplastic syndromes [33–35]. However, our CRMP5-seropositive patients did not have cancer at the time of testing.
In summary, our research identified novel AAbs specific against the optic nerve antigens unknown before in autoimmune neuro-retinopathy, suggesting the autoimmune nature of the syndrome. Indirect evidence, coming from clinical, functional, and imaging observations and immunology strongly suggest that these AAbs may play a direct role in the disease process. However, direct proof of the pathogenic potential of these anti-optic nerve antibodies is needed. If pathogenic, AAbs binding to proteins in optic nerve neurons may lead to disruption of protein function apoptosis of cells, as well as inhibiting enzymes that preserve neuronal glycolytic activity and neuronal integrity. Some of the neuronal antigens present in these patients coincide with molecular targets in other entities, such as NMO and other recognized paraneoplastic syndromes. These AAbs likely cause additional visual loss via an optic nerve-related component in autoimmune retinopathies that had been thus far underappreciated and underestimated in its frequency, and may offer additional treatment targets for patients with autoimmune neuro-retinopathies.
The authors thank Dr. Larry David of the OHSU Proteomic Core Facility for his assistance in the MS/MS analysis of glyceraldehyde 3-phosphate dehydrogenase (GAPDH) antigen. Special thanks to Dr. Sakir Humayun Gultekin, an OHSU Neuropathologist for his help in procuring a donor optic nerve tissue for the study. This work was supported by National Eye Institute Grants RO1 EY13053 (GA), R21 EY18416 (AI) and unrestricted RPB grants to CEI and HEI.
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