A case of variant of GBS with positive serum ganglioside GD3 IgG antibody

Background Acute bulbar palsy-plus (ABPp) syndrome is an unusual variant of Guillain-Barré syndrome (GBS). Anti-GT1a and anti-GQ1b antibodies have been reported in patients with ABPp, but without reports related to GD3 antibodies. Methods Clinical data of a patient diagnosed as ABPp syndrome were reviewed clinically. And we summarized the GBS patients with ABP and facial paralysis reported in the literature. Results We reported a 13-year-old girl presented with asymmetric bifacial weakness, bulbar palsy and transient limb numbness, and had positive serum IgG anti-GD3 antibody. Through reviewing the GBS patients with ABP and facial paralysis reported previously, we found that facial palsy could be unilateral or bilateral. The bilateral facial palsy could present successively or simultaneously, and could be symmetrical or asymmetrical. Other common symptoms included ophthalmoplegia, sensory abnormality and ataxia. IgG anti-GT1a and IgG anti-GQ1b antibodies were the most frequent. Most of the patients had full recovery within two weeks to one year of follow-up. Conclusions We reported a patient with asymmetric bifacial palsy and bulbar palsy, which seemed to fit the diagnosis of ABPp syndrome. This was the first report of ABPp variant of GBS with positive serum ganglioside GD3 IgG antibody. Supplementary Information The online version contains supplementary material available at 10.1186/s13052-024-01682-1.

cranial neuropathies without neck or limb weakness [3].Some specific anti-ganglioside antibodies were closely related to the clinical features of classic GBS and its variants.A comparative study by Ito et al. [4] revealed that anti-GQ1b antibodies were present in 83% of patients with Miller Fisher syndrome (MFS) and 68% of patients with Bickerstaff brainstem encephalitis (BBE).Half of patients with pharyngeal-cervical-brachial (PCB) carried IgG anti-GT1a antibodies which might cross-react with GQ1b [5].For patients with ABPp, the association with anti-GT1a and anti-GQ1b antibodies had been reported [3].Here, we reported a 13-year-old girl who presented with asymmetric bifacial weakness, bulbar palsy and transient limb numbness, which was the first report of Background Guillain-Barré syndrome (GBS) is an immune-mediated polyradiculoneuropathy, which is subclassified into classic and localized forms [1].More rare variants include the bifacial weakness with paresthesias and acute bulbar palsy-plus (ABPp) syndrome [2,3].The former is characterized by isolated bifacial weakness and distal limb paresthesias [2], and the latter presents with multiple ABPp variant of GBS with positive serum ganglioside GD3 IgG antibody.

Methods
The patient was admitted to our department in October 2022.Clinical data were reviewed clinically to obtain information.Blood cell count, blood biochemistry, blood electrolytes, blood ammonia, cytokine assay, cerebrospinal fluid (CSF) examinations, brain magnetic resonance imaging (MRI), magnetic resonance angiographyscans (MRA), magnetic resonance venography (MRV) and electromyography were performed.Serum and CSF ganglioside IgM and IgG antibodies were determined using BLOT.

Results
A 13-year-old normally developing girl presented to our hospital with worsening facial weakness.The patient presented with incomplete closure of the left eye and deviated mouth to right, with hypogeusia, since 1.5 months ago.She was presumed as Bell's palsy by the local pediatrician and was treated with traditional Chinese medicine and acupuncture therapy for 3 weeks.Her left facial weakness improved slightly.While 3 days prior to presentation, she presented with new symptoms that incomplete closure of the right eye, deviated mouth to left, numbness of the tongue, earache, hypogeusia, dysphagia and paroxysmal weakness and numbness of the right upper limb.
On admission, she appeared alert and oriented.Nervous system physical examination revealed flat and few expression of her face, incomplete closure of the bilateral eyes, effacement of nasolabial fold and forehead wrinkle, more pronounced on the right side, and deviated mouth to left.She was noted to have lower tone voice with slightly nasal intonation.She could not swallow properly and had dysphagia to solids.There was bilateral paralysis of the soft palate and loss of pharyngeal reflex.Her muscle strength and tension was normal.The deep tendon reflexes were elicited symmetrically.Pathological reflex examination was negative.Examinations of coordinate movement including Romberg test, finger-to-nose, alternating movement and heel-to-shin tests were normal.

Discussion
GBS is an immune-mediated inflammatory disease of peripheral nervous system [6].The incidence is approximately 1-2 per 100,000 person [6].Some distinct  ABPp syndrome, as a rare variant of GBS, characterized with ABP plus other cranial symptoms or additional signs (such as ataxia) but without neck or limb weakness [3,9].The glossopharynx and vagus nerves are adjacent to each other and are often damaged at the same time, presenting as hoarseness, dysphagia, drinking cough and pharyngeal reflex disappear, called bulbar paralysis (true bulbar paralysis).Kim et al. [3] and Cao et al. [9] proposed the diagnostic criteria of ABPp syndrome as follows: (1) prominent ABP, absence of neck and limb weakness; (2) other cranial involvements or gait ataxia or both; (3) compliance with the illness pattern of general GBS; and (4) absence of identified alternative diagnosis.According to the presentation of our patient here, we summarized the GBS patients with ABP and facial paralysis reported previously, which fit the diagnosis of ABPp syndrome (Table 2) [3,[10][11][12][13][14][15][16][17][18][19][20][21][22][23].The literature search showed twenty-three patients previously, eighteen adults (age: 20y-67y) and five children (age: 10 m-13y).Twelve of the 24 cases (including our case) were female.The facial palsy was unilateral in 12 patients and bilateral in 10 patients.The bilateral facial palsy could present successively or simultaneously, and could be symmetrical or asymmetrical.Other symptoms included ophthalmoplegia (including ptosis and diplopia, 16/24), sensory abnormality (12/24), ataxia (9/24), neck weakness (1/24) and limb weakness (1/24).It suggested that ABPp syndrome were rarely 'pure' , which could manifest features that were typical of other variant forms, such as bifacial weakness with paresthesias, MFS or PCB variant, but it differs from them in the prominent bulbar palsy.Deep tendon reflexes were absent or decreased in 14 patients and remained normal in 10 patients.CSF albuminocytological dissociation was found in 68.4% patients (13/19 cases available).
Gangliosides are sialic acid-containing glycosphingolipids (GSLs) ubiquitously distributed in tissues and body fluids, and are more abundantly expressed in the nervous system [24].The expression levels and patterns of gangliosides undergo dramatic changes during brain development [25].In the early embryonic brain, the pattern of ganglioside expression is characterized by the abundance of simple gangliosides, such as GM3 and GD3.As the brain develops, the expression of these simple gangliosides is down-regulated with concomitant up-regulation of complex gangliosides such as GM1, GD1a, GD1b, and GT1b, etc [26].Thus, GD3, GD-1b, GT-1a, and GQ-1b are structurally similar.To some extent, this dynamic correlation might explain the similar symptoms between our patient with positive anti-GD3 antibody and other ABPp with GT-1a or GQ-1b antibodies.Through autoimmune reactions, GD3 antibodies might bind to gangliosides on the surface of nerve cell membranes, promoting neurological damage [27].
IVIG and plasma exchange, as the first-line treatment of GBS, were used in most patients (14/24 cases and 4/24 cases, respectively) with good effects.In addition, six of the 24 patients had spontaneous improvement under symptomatic and supportive treatment [12,14,20,22,23].Most of the patients (15/24 cases) had full recovery within two weeks to one year of follow-up.

Conclusions
In conclusion, we reported a patient with asymmetric bifacial palsy and bulbar palsy, which seemed to fit the diagnosis of ABPp variant.This was the first report of ABPp variant of GBS with positive serum ganglioside GD3 IgG antibody.

Table 2
Summary of previously reported GBS patients with acute bulbar palsy and facial paralysis