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2016 ; 16
(1
): 229
Nephropedia Template TP
gab.com Text
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English Wikipedia
Myasthenic symptoms in anti-low-density lipoprotein receptor-related protein 4
antibody-seropositive amyotrophic lateral sclerosis: two case reports
#MMPMID27863479
Takahashi H
; Noto YI
; Makita N
; Kushimura-Okada Y
; Ishii R
; Tanaka A
; Ohara T
; Nakane S
; Higuchi O
; Nakagawa M
; Mizuno T
BMC Neurol
2016[Nov]; 16
(1
): 229
PMID27863479
show ga
BACKGROUND: Myasthenic symptoms can be present in patients with amyotrophic
lateral sclerosis (ALS). These symptoms have been considered to be caused by the
degeneration of distal motor neurons and the neuromuscular junction (NMJ). Recent
studies suggested that antibody to low-density lipoprotein receptor-related
protein 4 (LRP4) was a pathogenic agent of myasthenia gravis (MG), and it was
also detected in ALS patients. CASE PRESENTATION: Patient 1: A 58-year-old
Japanese man developed progressive weakness and subsequent myasthenic symptoms
including oculomotor disturbance. Clinical examination and electrophysiological
studies confirmed upper and lower motor neuron involvement and NMJ dysfunction,
and anti-LRP4 antibody was detected in his serum. A series of immunotherapies,
including steroid pulse therapy, intravenous immunoglobulin, and plasmapheresis,
was performed, and the myasthenic symptoms partially improved. The titer of
anti-LRP4 antibody subsequently decreased. However, the therapeutic effect was
transient, and ALS symptoms progressed. His clinical findings fulfilled the
criteria of probable ALS using the Awaji criteria. Patient 2: A 74-year-old
Japanese man suffered from progressive weakness of all limbs and dropped head in
the evening. He complained of diplopia with a lateral horizontal gaze. Probable
ALS was diagnosed because of the upper and lower motor neuron signs, whereas
anti-LRP4 antibody was detected. Several immunotherapies were administered, and
the myasthenic symptoms partially responded to each therapy. However, the truncal
muscle weakness progressed, and he died of respiratory failure. CONCLUSION: We
report two anti-LRP4 antibody-seropositive ALS patients with myasthenia who were
not typical of ALS patients, and showed partial responses to immunotherapies. The
anti-LRP4 antibody-seropositive status may influence developing ALS and cause
additional ALS symptoms.