BACKGROUND/AIM Serum antibody against ganglioside GQ1b is reported to be closely associated with immune mediated ophthalmoplegia in the Fisher and Guillain-Barré syndromes. Its presence against glycolipids, in particular ganglioside GQ1b, was investigated in patients with ophthalmoplegia of unknown origin.
METHODS 16 patients with ophthalmoplegia, the cause of which could not be confirmed from clinical findings or diagnostic testing, were tested. 34 patients who had ophthalmoplegia of definite cause, 16 healthy people, and 23 patients with typical Fisher syndrome served as the controls. The ELISA was used to check for serum antibodies against glycolipids in all study participants.
RESULTS Two of the 16 patients with ophthalmoplegia of unknown cause had serum IgG antibody against GQ1b but not against other glycolipids, and 22 of the 23 patients with typical Fisher syndrome had this antibody. No anti-GQ1b antibodies were found in the patients with ophthalmoplegia of definite cause or in the normal controls.
CONCLUSION A common underlying cause appears to bring about the pathogenesis of palsy in Fisher syndrome and in the ophthalmoplegia with positive anti-GQ1b IgG antibody, called atypical Fisher syndrome. This antibody may prove a useful clinical marker for differentiating Fisher syndrome, typical and atypical, in patients with ophthalmoplegia.
- GQ1b ganglioside
- Fisher syndrome
- Guillain-Barré syndrome
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Patients with various neurological diseases, including Guillain-Barré syndrome (GBS), have serum antibodies to glycolipids, indicative that an autoimmune mechanism contributes to these diseases.12 Patients in the acute phase of Fisher syndrome (FS), a variant of GBS, characteristically have the IgG antibody against the glycolipid GQ1b.3-5
Ophthalmoplegia, a main clinical sign of FS, is closely associated with anti-GQ1b IgG antibody in GBS with ophthalmoplegia, as it is in FS.6 Eight patients with acute ophthalmoparesis with antecedent infection appeared to have this antibody,7 but no studies have been done on large numbers of patients with ophthalmoplegia. We investigated whether these antibodies are present in patients with ophthalmoplegia of various origins, including undetermined ones.
Materials and methods
EXAMINATION OF ANTIGLYCOLIPID ANTIBODY IN PATIENTS’ SERA
Serum samples were obtained from 50 patients with ophthalmoplegia who were treated at Dokkyo University’s Koshigaya Hospital between June 1993 and October 1994. Of the ophthalmoplegia cases studied, 16 were of undiagnosed causes based on the clinical signs, results of neuroimaging, and laboratory studies, and 34 of definite causes (20 vascular origin, four myasthenia gravis, three head trauma, two brain tumour accompanied by multiple sclerosis or dysthyroid ophthalmopathy, and one congenital). Patients in the “vascular origin” group had lesions on computed tomography (CT) scans or magnetic resonance images (MRI), indicative of infarction of the brain stem or atherosclerotic diseases such as diabetes mellitus or hypertension.
Except in the case of congenital origin, all the samples were obtained within 1 month of the initial onset. Information on the patients with ophthalmoplegia of undiagnosed cause is given in Table 1. Serum samples from 16 normal subjects and 23 patients with typical FS, all of whom had the triad (ophthalmoplegia, ataxia, and hypoflexia) of this syndrome were also tested .
Enzyme linked immunosorbent assay (ELISA)
Serum IgG and IgM antibody activities against eight gangliosides (GM1, GM2, GM3, GD1a, GD1b, GD3, GT1b, and GQ1b) and two neutral glycolipids (asialo-GM1 (GA1) and galactocerebroside) were investigated using the ELISA as reported elsewhere.6 All the glycolipids, except GQ1b and GA1, were purchased from Funakoshi (Tokyo, Japan). GQ1b was bought from Dia-Iatron (Tokyo, Japan), and GA1 was prepared in our laboratory from the GM1 of bovine brain.
EXAMINATION OF ANTIGLYCOLIPID ANTIBODY IN PATIENTS’ SERA
Two of the 16 patients with ophthalmoplegia of undetermined cause had anti-GQ1b IgG antibody (Fig1) but no other antiglycolipid antibodies. The anti-GQ1b IgG antibody titre in patient No 13, which was estimated serially three times, decreased with the patient’s recovery from ophthalmoplegia (Fig 2). No anti-GQ1b antibody was found in the ophthalmoplegic patients for which the cause was known or in the normal subjects, whereas, except for one patient, all those with typical FS had increased anti-GQ1b IgG antibody (Fig1).
Case 1 (patient 13)
A 56 year old woman referred to our clinic had the chief complaint of diplopia (Fig 2). She had had fever and headache 7 days before referral and horizontal diplopia 4 days before. At the initial examination, her visual acuity was normal. No abnormalities were found in the slit lamp and ophthalmoscopic examinations. She had mild abducens palsy bilaterally, but the other cranial nerves were intact. The biceps reflex was absent bilaterally, but there was no ataxia. A head CT scan and blood and urine analyses, including virus titres, were all normal. A cerebrospinal tap was not performed. Anti-GQ1b antibody was positive in her serum, and its titres decreased with the clinical course. Oral prednisolone was given in a tapered off dose of 15 mg. Her abducens palsy was resolved after 2 months.
Case 2 (patient 8)
A 62 year old woman visited our hospital with the chief complaint of blepharoptosis and diplopia. Ptosis on the right side had occurred 1 month earlier but had disappeared after 3 weeks. She experienced horizontal diplopia 1 week before the consultation at our hospital. There had been no viral infection nor a past history of hypertension or diabetes mellitus. At the initial examination no visual acuity abnormality was found, and results of the slit lamp and ophthalmoscopic examinations were normal. She had 15 prism esotropia and severe limitation of right eye movement in all directions, particularly the lateral direction. The pupils and trigeminal nerves were normal, and there was no blepharoptosis or proptosis. Results of the other neurological, blood, and urine examinations were normal. Serum acetylcholine receptor antibodies were negative. A head CT scan was negative around the brain stem, orbit, and cavernous sinus. Painful ophthalmoplegia was diagnosed. Anti-GQ1b antibody was positive in a serum sample obtained 30 days after onset. Her ophthalmoplegia was resolved after 3 months of corticosteroid treatment.
Ophthalmoplegia is caused by various underlying factors, the most common ones being vascular disorder, neoplasm, and head trauma. Despite advances in diagnostic techniques, the causes of about 20% of ophthalmoplegia cases are undetermined.8 We could find no definite cause of the ophthalmoplegia of 16 of the 50 patients studied. Some patients with ophthalmoplegia of undetermined cause may have microvascular disorders that are undetectable by CT scan only or even other additional procedures, as judged by their relatively benign recoveries and older ages (mean 52 years). Some patients may have such postinfectious syndromes as GBS or FS, but confirmation is difficult because of incomplete clinical findings.
FS, characterised by the clinical triad of ophthalmoplegia, ataxia, and areflexia, is considered a variant of GBS because of their common clinical features.9 Plasmapheresis brings about rapid recovery in both FS and GBS,1011 indicative that a humoral factor is involved in the pathogenesis of both syndromes. Serum antiganglioside antibodies are present in patients with GBS12: Chiba et al, who reported the frequent presence of serum IgG antibody against ganglioside GQ1b in patients with FS in the acute phase, speculated that an immune feature common to FS and GBS, antiganglioside antibody, exists.3 Subsequent studies have confirmed that almost all patients with FS have the anti-GQ1b antibody.411
Most patients with GBS with ophthalmoplegia also have the anti-GQ1b IgG antibody, but it has not been found in patients with GBS withoutophthalmoplegia.6 Investigations have been made to ascertain the immune mechanism that induces ophthalmoplegia. An anti-GQ1b mouse monoclonal antibody immunostains the extramedullary portions of the human oculomotor, trochlear, and abducens nerves.6 Although anti-GQ1b antibody may be elevated, owing to tissue destruction, it is likely that the serum IgG antibody against GQ1b functions in the pathogenesis of acute ophthalmoplegia in FS and GBS on the basis of the time lag between the peaks of antibody activity and the clinical symptoms.6
In our study, two (Nos 8 and 13) of the 16 patients with ophthalmoplegia of undetermined cause had IgG antibody against GQ1b but no antibodies against other glycolipids. Yuki reported eight patients with acute ocular paresis after an antecedent infection who had IgG anti-GQ1b antibody.7 Only our patient 13, however, had signs of post-infectious syndrome. Both our patients probably have immune damage to the ocular motor nerves similar to that seen in FS.
These facts indicate that some patients with ophthalmoplegia of unknown cause may be categorised as having an autoimmune disease related to FS. Patients with probable FS sometimes have ophthalmoplegia but without ataxia or areflexia, and some of them have been diagnosed as having atypical FS on the basis of clinical features alone. The determination of the presence of serum antibodies against ganglioside GQ1b in such patients is useful for verifying the diagnosis. Our two patients with anti-GQ1b antibody seem to have atypical FS, even though they showed apparent ophthalmoplegia without other characteristic signs.
The administration of corticosteroids was effective to some extent. A favourable response to plasmapheresis has been reported,910 but steroid therapy also appears to be useful for patients with ophthalmoplegia related to immune disease.
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